Improve the efficiency of laser cutting machine

Improve the efficiency of laser cutting machine 

Laser cutting machine is mainly using laser beam to the plate surface and release energy to see steel melting and evaporation, because energy is highly concentrated can rapid local heating to melt and vaporize steel plate, because the energy is concentrated, just only a small amount of steel reached other parts, basic not caused any deformation, using laser can produce complex shape of the workpiece, the cutting of the workpiece, the does not need for the next step processing can be used directly.
Laser cutting machine has three advantages: good cutting quality, fast processing speed, clean, safe, no pollution, in the production of laser cutting machine power is certain, so I want to improve efficiency, it is necessary to adjust operation.

1 The learning and manipulation of new machines           

In the process of operation, the operator needs to strengthen the learning and skills of the machine performance through the daily production. To will work on an alternative practice, spare time to strengthen the machine in all aspects of knowledge learning, do meet machine appear small problem can be solved, the problem appeared to know where the problem lies, and help solve the problem.

2 Know how to modify the CNC cutting procedures           

For CNC laser cutting machine, make changes to the program, using linear surgical method, will drive up to the point on the arc, the cutting down of circular cross section is very smooth, to ensure that the quality of the parts.

3 Optimize the scheduling scheme           

Through consultation and the fish Technology Department of the workshop, the two beam sharing a common edge cutting, this does not affect to the cutting effect, so the efficiency is to artificially raise.

A comprehensive analysis of technology characteristic of laser cutting machine

A comprehensive analysis of technology characteristic of laser cutting machine

With the development of laser technology and mature, laser equipment has been widely application in all walks of life, such as laser marking machine, laser welding machine, laser drilling machine and laser cutting machine, and so on, especially CNC laser cutting machinery and equipment in recent years rapid development, is widely used in sheet metal, metal products, steel structure, precision machinery, auto parts, glasses, jewelry, nameplate, advertisement, arts and crafts, electronics, toys, packaging and other industries. Compared with other cutting equipment, CNC laser cutting machine is mainly reflected in the following aspects:

1, with high cutting speed, cutting quality is good, high precision;      
2, cut line is narrow, the cutting surface is smooth, does not damage the work piece;          
3, not affected by the shape of the workpiece, the material is not affected by the hardness;          
4, in addition to the processing of metal materials, but also for non metal cutting processing;          
5, saving investment, saving materials, more effective cost savings;      
6, the operation is simple, safe, stable performance, improve the speed of new product development, with a wide range of adaptability and flexibility.

Mechanical structure of metal CNC laser cutting machine is the most important part, not only most of the components are installed in the rack, and also the work gravity and acceleration and deceleration during the full impact loads.

CNC laser cutting machine design and development work including:

1, determine the CNC laser cutting equipment in a variety of conditions and the environment of fast, high precision, stable operation of the conditions.       2, according to the functional requirements of the frame structure, parameters, combined with the structural characteristics of the laser cutting machine, the establishment of the corresponding dynamic model.          
3, the structure and parameters of the frame are studied, the influence of the parameters on the static and dynamic stiffness and thermal stability of the frame are studied, and the theoretical basis for the design of the frame is provided. 4, determine the frame and other parts of the mutual coupling relationship

Therefore, CNC metal cutting machine designed in how to arrange the metals to reduce weight, increase body stiffness, reduce the effects of temperature change on accuracy, it is necessary to focus on the problems in the design process.
Therefore, in CNC metal cutting machine design how reasonable layout of metal, reduce weight, improve the body stiffness, reduce the influence of temperature change on the accuracy, is should be focus on the problem of the design process.
In the metal cutting laser circuit, there is a strong interference between analog signal and digital signal problem. Photoelectric isolation circuit is in electrical isolation to light for coal medium of transmission signal, the input and output circuit can isolate. So it can effectively suppress noise in the system, to clear the earth loop interference, responds faster, long service life, small volume, shock resistance etc. the benefits the in the strong - weak interface, especially in microcomputer system of backward and to the channel obtained widely application.

Photoelectric coupler has three characteristics:          
1, the signal is transmitted to take the form of electric light electricity, the light emitting part and the light receiving part are not in contact, which can avoid the feedback and the interference of the output end to the input end;     2, the ability to suppress noise interference;          
3, with a durable, high reliability and high speed and other advantages, the response time is generally within a few, the response time of high-speed optoelectronic coupler and some even less than 10ns.
Therefore, in the numerical control laser cutting machine system circuit design, should pay attention to the isolation of the input signal circuit and SCM connection. Here, the use of photoelectric coupling is the most commonly used method.
In the industrial manufacturing system of heavy metal processing industry, a lot of metal materials, no matter what kind of hardness it is, can be carried out without deformation cutting. Of course, for high reflectivity materials, such as gold, silver, copper and aluminum alloys, they are also good heat transfer conductor, so the laser cutting machine is difficult, and even can not be cut.
In spite of the laser cutting machine specific technology was a huge advantage, but as a high-tech equipment to use laser cutting machine to achieve the ideal cutting and processing effect, must also master the processing technical parameters and operation processes. Especially in the metal laser cutting machine cutting process, to select the appropriate cutting speed, or may cause some undesirable cutting results, mainly in the following:
1, when the laser cutting speed is too fast, it will cause the following adverse results:          
①.Method of cutting, spark spraying;          
②.The cutting surface is inclined to the lines, and the lower part of the production of molten stains;          
③.Cause the whole section is rough, but no melt stain is produced;
2, on the contrary, when the laser cutting speed is too slow, it will cause:   ①.Melting condition, the cutting surface is rough.          
②.The slit width, in sharp parts of the whole.          
③.Affect the cutting efficiency.
Therefore, in order to make the laser cutting machine equipment to better play its cutting function, you can cut the spark from the laser equipment to determine whether the feed rate is suitable:          
1, if the spark from the top down, it indicates that cutting speed is appropriate;          
2, if the spark back tilt, it indicates that the feed rate is too fast;       3, if the spark is not diffusion and less, together, it indicates that the speed is too slow.          
Most organic and inorganic materials can be used as laser cutting machine. Compared with other traditional cutting methods, laser cutting has obvious advantages compared with other traditional methods. Laser cutting machine has the characteristics of narrow slit, small deformation of the workpiece and high speed, high efficiency, low cost, safe operation, stable performance and so on.

Several major problems of laser cutting thick metal plate

Several major problems of laser cutting thick metal plate

Laser processing, as an advanced material cutting method, has been more and more accepted by the sheet metal producers. With the progress of computer control technology and optical technology, increasingly high expectations for its processing capacity, looking forward to this is not only to cut, it is to cut and sliced expectations. But can give the answer of course can not be separated from the processing machine performance, while the quality of processed materials directly affect the effect of the answer.
Laser processing started earlier in the Europe and the United States and Japan, in the eighties of the last century began by laser processing machine manufacturers of steel production put forward specific quality requirements, and the difference from the ordinary steel but the price is on the high side of laser special steel. And with the laser processing as the main cutting tool is accepted, 25mm the following common steel plate on the laser professional materials as a standard material. However, due to China's development is too fast, too late to adapt to the production of steel, there is a difference between China's steel and imported steel. The main difference is that the content of impurities in steel and the processing of steel surface and transport custody and a series of reasons, resulting in the current situation of Chinese sheet metal cutting.
Today, China's crude steel production is not only the world's first, is more than 50% of global output, developing countries, and even some like Australia, South Korea and other developed countries in order to save costs also used in a large number of board of China, so instead of expecting China steel to adapt to laser cutting as research and put forward to quality processing of inferior materials methods and proposal. Some of these ideas are presented in this paper.
Problems encountered in the processing of medium and heavy plate
1.Carbon steel plate perforation in processing thick plates perforated time accounted for a large proportion, the laser manufacturers have developed a technique for rapid perforation, more representative is high-energy perforation (hole), the advantages of this method is fast (1 second, to t16mm as an example, following the same), but the drawback is that the enormous energy not only affects the processing of small shape, perforation injection of the plate temperature elevated and the impact on the rest of the whole cutting process. With a small power pulse perforation, then a long time (12 seconds), will lead to the cutting efficiency and the unit cost of the increase.
2.Cutting surface quality problem          
Figure 1 and Figure 2 shows a section cutting processing plate often meet, such cutting not only product quality has been questioned, but also with the slag sticking of burn and severe, that reflected not expensive laser processing machine difference to other ways of cutting the value.

3.Stability of whole plate processing          
In the whole process of domestic steel, there will often be a local area of the phenomenon of poor processing. This kind of phenomenon is sometimes very random, even if the machine is in good condition, it will appear. In order to deal with the local fault products and greatly affect the whole work progress, this is not the cause of the processing failure also gives some of the author's analysis and countermeasures.

Solutions of the above problems
1.Peak perforation (HPP) scheme          
As the name suggests is the use of a small duty cycle of the peak pulse laser, combined with the material on the surface of the fuel injection is not fuel to clear the opening edge of the attachment, the reasonable frequency of the control pulse edge cooling edge. Is characterized by relatively deep hole, although a slightly longer time (3 seconds), but penetrated aperture small (about diameter 4mm) and open hole edge without attachments and into the heat is low, to facilitate the next normal cutting, compared to ordinary perforated is to improve the efficiency of 4 times. Figure 3 shows the difference between an ordinary perforation, a HPP perforation, and a high energy punch.

2.Cutting section improvement program          
For the carbon steel, the important factor to improve the cutting section is to control the heat input to the plate and to ensure the full combustion of the laser irradiation. MITSUBISHI motor development K-CUT processing conditions better to complete the mission. Fig. 4 Comparison of the effects of traditional and K-CUT conditions on the same piece of domestic plate. For stainless steel, the important factor to improve the cutting section is the improvement of the beam (improving the depth of focus) and the effective utilization of the auxiliary gas. The bright surface cutting technique is to improve the results obtained by the oscillator and the nozzle. Figure 5 is the effect after improvement. The lower part of the upper part of the section of rough 8 mu and 12 Mu as mechanical processing.

3.Scheme to ensure processing stability          
At present, in order to improve the running speed of the processing machine, the laser machine adopts the structure that is called the flight light path, that is, the material tray does not move and the processing head can move in the whole processing area. In order to compensate for the change of the relative position of the working head and the light source, the manufacturers can also ensure the consistency of the light spot in the range of processing. Although this method has simple structure, it will change the depth of focus, so that in the depth of the depth of the plate is very sensitive to cutting the thick plate will appear to be inadequate (both to keep the light spot and keep the focus depth constant). MITSUBISHI motor using the same length of light path (in the range of light source and the processing of the optical path between the processing head) can avoid the depth of focus changes, so that the spot and the depth of focus are consistent. In addition, the heat gained by the hot plate is controlled, which can solve the stability problem. Figure 6 shows the principle of long path and in the processing area at different points in the processing effect.

Take seriously the problems in the process, study the mechanism and find the solution to the problem. Through the traditional laser technique, a series of exploration and improvement, for more complex plate cutting developed new technology and its application to the ex plus, Rx, XL, etc. series of products, to meet the actual needs of customers in the domestic plate materials processing, thereby greatly improving the production efficiency. We will further efforts to explore new technologies to solve more difficult problems in the processing of the majority of users.

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JINAN XIAOJIA CNC MACHINERY EQUIPMENT CO.,LTD

The essential difference between the four types of laser cutting technology

The essential difference between the four types of laser cutting technology
Laser cutting is irradiated materials rapidly melting, vaporization and ablation or achieve ignition, with high power density laser beam irradiating a work, at the same time with coaxial with the beam of high speed airflow blow in the molten material, so as to realize the workpiece cut. Laser cutting is one of the hot cutting methods.
Laser cutting can be divided for laser vaporization cutting, laser fusion cutting, laser oxygen cutting and laser scribing and breaking control four categories.

1.Laser vaporization cutting
Using high energy density of laser beam heating the workpiece, so that the temperature rose rapidly, in a very short period of time to reach the boiling point of the material, the material began to vaporization, the formation of steam. The steam jet is very large, and in the same time, it forms a notch on the material. The vaporization heat of the material is generally very large, so the laser vaporization cutting requires a great deal of power and power density.
Laser vaporization for cutting thin metal materials and nonmetal materials. (such as paper, cloth, wood, plastic, rubber, etc.)

2.Laser melting and cutting
Cutting laser melting and laser heating to melting of metal materials, followed by blowing a non oxidizing gas (AR, he, N, etc.) and beam coaxial nozzle, gas rely on the strong pressure of the molten metal is discharged, the formation of incision. Laser melting and cutting does not require the complete vaporization of the metal, the energy required for vaporization of the 1/10.
Laser melting and cutting are mainly used for the cutting of materials or active metals, such as stainless steel, titanium, aluminum and its alloys.

3.Laser oxygen cutting
The principle of laser oxygen cutting is similar to that of oxygen acetylene cutting. It uses a laser as a heat source, with oxygen and other active gas as the cutting gas. On the one hand, the injection of the gas and the cutting metal, the oxidation reaction, the release of a large number of oxidation heat; on the other hand, the molten oxide and melt blown out from the reaction zone, the formation of the incision in the metal. Because of the oxidation reaction in the cutting process produces a lot of heat, so the energy required for laser oxygen cutting is only the melting of 1/2, and the cutting speed is much larger than the laser vaporization cutting and melting cutting.
Laser oxygen cutting is mainly used for metal materials and heat treatment of carbon steel, titanium steel oxidation.

4.Laser scribing and breaking control
Laser scribing is the high energy density of laser scanning on the surface of brittle materials, the material is heated to evaporate a small groove, and then applying a certain pressure, brittle materials will be along the slot at the split. Laser laser scribing generally used for Q switch and CO2 lasers.
The control fracture is the steep temperature distribution generated by the laser engraving, which produces the local thermal stress in the brittle material, which causes the material to be broken along the small groove.

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Safe operation of laser cutting machine

Safe operation of laser cutting machine

When laser cutting machine working,the failure is dangerous.Novice must undergo professional training in order to operate independently, the following to learn the 13 details of laser cutting machine safety work. 

1.Please follow the general cutting machine safety operation rules.Please start the laser in strict accordance with the laser start procedure. 

2.The operator must be trained to be familiar with the structure and performance of the equipment, and to master the relevant knowledge of the operating system. 

3.Wear good labor protective equipment according to regulations, must wear the protective glasses in line with the provisions in the vicinity of the laser beam.

4.Pls don't working the material when be not sure if it is suitable for laser,invoide producing the harmful fumes and vapors.

5.Operator is not allowed to leave the position when the equipment is running, if need to leave, please stop or cut off the power switch. 

6.Please put fire extinguishers in your fingertips; stop processing, please turn off the laser or optical gate; do not put paper, cloth or other flammable substances in the unprotected laser beam around.

7.When the abnormal appearance in the processing process, should be immediately shut down, in a timely manner to eliminate the failure or reported to the competent personnel. 

8.Keep the laser, bed and around the site clean and orderly, no pollution, waste, according to the provisions of the workpiece, sheet piling. 

9.When using gas cylinders, should avoid crushing welding wire, so as to avoid leakage accident. The use of gas cylinders, transport should comply with the rules of gas cylinders. The ban of gas cylinders in the sun or near the heat of the sun. When the valve is opened, the operator must stand on the side of the bottle mouth. 

10.Please observe the high pressure safety rules when repare laser machine.Follow the rules and procedures for 40 hours or one week per operation, 1000 hoursor six months of maintenance. 

11.After the boot, please first manual low speed Y, X direction of the machine, check to confirm whether there is abnormal situation. 

12.The new work program input, please try to run, and check its operate situation. 

13.During the work, observe the operation of the machine, so as to avoid the cutting machine out of the effective range or two sets of collision caused the accident.

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Overcome the difficulties of laser cutting machine cutting metal pipe technology

Overcome the difficulties of laser cutting machine cutting metal pipe technology 

Accompanied by the rapid growth of the stainless steel pipe production and consumption, laser cutting tube equipment are growing rapidly in popularity, the demand of personnel and technology of laser cutting machine grown quickly.This highlights the shortage and lag in the laser cutting equipment and laser cutting Overcome the difficulties of laser cutting machine cutting metal pipe technology 

Accompanied by the rapid growth of the stainless steel pipe production and consumption, laser cutting tube equipment are growing rapidly in popularity, the demand of personnel and technology of laser cutting machine grown quickly.This highlights the shortage and lag in the laser cutting equipment and laser pipe cutting talent and technology, which is also reflected in some stainless steel enterprises, with advanced laser cutting equipment, but still exposed pipe cutting efficiency is low, poor quality management, resulting in the phenomenon of serious waste of pipe. 

Laser pipe cutting processing technology is a high production efficiency, productivity and strong technology.Can modified the design at the last minute without affecting the entire the production process.Greater benefits is that the end user can control the short version or medium version in production without making a large number of templates, so you can give more quickly respond to customer needs, so this does not need to make the molds.From the perspective of flexibility, laser cutting processing technology can be used to process any shape of the processing program, and the laser can be completed in any direction. The shape of the template can be changed quickly, without the help of any tool, providing the possibility to process a competitive personalized packaging or trademark. Accuracy is one of the advantages of digital systems. Laser processing can offset printing and finishing process in the presence of inaccurate, such as material may produce flexible deformation, the laser can be based on these deformation is adjusted, and the traditional template making is not. Laser tube cutting products processing is a very accurate and high level technology, Of course, this requires a certain cost of investment in the early stage, the following will focus on the relevant issues related to laser cutting and provide targeted solutions.  
Worker can draw,nesting,cutting with the professional pipe cutting and nesting software,generate cutting program,then full automatic laser cutting for the large length of stainless steel pipe.The speciality of tube nesting software is the basis and prerequisite for the realization of high volume, high efficiency and high quality cutting production of laser tube cutting machine. 
At present, the laser pipe cutting process, there are some quality problems, for example: led to cut some parts over burning, pipe cutting inclined plane for burning, part corner, and cutting circular parts circle deformation or cannot be closed, pipe directly lead to serious waste and cut tube production efficiency is low. CNC pipe cutting technology refers to the NC system of the cutting control software to provide advanced cutting tube technology and rich pipe cutting experience, pipe cutting workers to operate by skilled in the use of control system, to achieve high quality, high efficiency of CNC cutting. CNC laser cutting technology is a high volume, high efficiency, high quality cutting production methods, CNC cutting pipe is the core of CNC cutting system. 
Pipe cutting process due to pipe cutting (especially for tubular diameter of square tubes), slag, attached on the tube wall, most of the heat produced in the cutting is absorption of the workpiece, cutting density is large, often cause overheating pipes, corner and square tube four horns, burning, seriously affecting the ring incision quality, can't even cutting. For such problems, the following solutions can be used: 
1, increase oxygen pressure.           
2, improve the angular speed of synthesis by software.           
3, laser cutting headband height sensing with dynamic system can guarantee in the process of cutting, cutting the nozzle and the workpiece plane height remained unchanged (focus unchanged), cutting effect does not change with the surface of the workpiece affected. 
The proposed solution will improve the laser tube cutting processing equipment efficiency in the use of, so as to improve the cutting efficiency is low, poor quality management, pipe caused serious waste, improve production and processing enterprises product efficiency, for the enterprise to create a better profit. talent and technology, which is also reflected in some stainless steel enterprises, with advanced laser cutting equipment, but still exposed pipe cutting efficiency is low, poor quality management, resulting in the phenomenon of serious waste of pipe. 
Laser pipe cutting processing technology is a high production efficiency, productivity and strong technology.Can modified the design at the last minute without affecting the entire the production process.Greater benefits is that the end user can control the short version or medium version in production without making a large number of templates, so you can give more quickly respond to customer needs, so this does not need to make the molds.From the perspective of flexibility, laser cutting processing technology can be used to process any shape of the processing program, and the laser can be completed in any direction. The shape of the template can be changed quickly, without the help of any tool, providing the possibility to process a competitive personalized packaging or trademark. Accuracy is one of the advantages of digital systems. Laser processing can offset printing and finishing process in the presence of inaccurate, such as material may produce flexible deformation, the laser can be based on these deformation is adjusted, and the traditional template making is not. Laser tube cutting products processing is a very accurate and high level technology, Of course, this requires a certain cost of investment in the early stage, the following will focus on the relevant issues related to laser cutting and provide targeted solutions.  
Worker can draw,nesting,cutting with the professional pipe cutting and nesting software,generate cutting program,then full automatic laser cutting for the large length of stainless steel pipe.The speciality of tube nesting software is the basis and prerequisite for the realization of high volume, high efficiency and high quality cutting production of laser tube cutting machine. 
At present, the laser pipe cutting process, there are some quality problems, for example: led to cut some parts over burning, pipe cutting inclined plane for burning, part corner, and cutting circular parts circle deformation or cannot be closed, pipe directly lead to serious waste and cut tube production efficiency is low. CNC pipe cutting technology refers to the NC system of the cutting control software to provide advanced cutting tube technology and rich pipe cutting experience, pipe cutting workers to operate by skilled in the use of control system, to achieve high quality, high efficiency of CNC cutting. CNC laser cutting technology is a high volume, high efficiency, high quality cutting production methods, CNC cutting pipe is the core of CNC cutting system. 
Pipe cutting process due to pipe cutting (especially for tubular diameter of square tubes), slag, attached on the tube wall, most of the heat produced in the cutting is absorption of the workpiece, cutting density is large, often cause overheating pipes, corner and square tube four horns, burning, seriously affecting the ring incision quality, can't even cutting. For such problems, the following solutions can be used: 
1, increase oxygen pressure.           
2, improve the angular speed of synthesis by software.           
3, laser cutting headband height sensing with dynamic system can guarantee in the process of cutting, cutting the nozzle and the workpiece plane height remained unchanged (focus unchanged), cutting effect does not change with the surface of the workpiece affected. 
The proposed solution will improve the laser tube cutting processing equipment efficiency in the use of, so as to improve the cutting efficiency is low, poor quality management, pipe caused serious waste, improve production and processing enterprises product efficiency, for the enterprise to create a better profit.

Laser cutting machine cutting 7 types different metal materials

Laser cutting machine cutting 7 types different metal materials

Metal on the initiation of 10.6 um laser beam absorption rate is only from 0.5% ~ 10%, however, when with a power density of more than 106w/cm2 focused laser beam irradiation to the metal surface, but it can in the microsecond time soon so that the surface begins to melt. The absorption rate of most metals in the molten state has risen sharply, which is generally improved by 60%~80%.

1.Titanium and its alloys.          

Pure titanium can be very good coupling focused laser beam transformation of heat energy, auxiliary gas oxygen chemical reaction, cutting speed, but easy to generate oxide layer on the cut edge, not careful will cause too much. For the sake of safety, the use of air as an auxiliary gas is better, to ensure the quality of cutting.          
Aircraft manufacturing industry commonly used titanium alloy laser cutting quality is better, although there will be a little sticky residue at the bottom, but it is easy to clean up.

2.Nickel alloy.          

Nickel based alloy, also known as super alloy, a lot of variety. Most of them can be carried out to melt and cut.

3.Carbon steel.          

Modern laser cutting machine can cut carbon steel plate with the maximum thickness of up to 20MM, the use of oxidation and melting cutting mechanism to cut carbon steel cutting seam can be controlled in a wide range of satisfaction, the thin sheet of its cut can be narrow to about 0.1MM.

4.Stainless steel.          

Laser cutting is an effective tool for the manufacture of the stainless steel sheet as the main component. In the strict control of the laser cutting process of the heat input measures can be restricted to the edge of the heat affected zone is very small, so that it is very effective to maintain the good corrosion resistance of such materials.

5.Alloy steel.         

The majority of alloy structural steel and alloy tool steel using laser cutting method to obtain good cutting quality. Even some of the high strength materials, as long as the process parameters are properly controlled, can get straight, non stick slag cutting edge. However, for high speed tool steel and hot die steel, laser cutting machine will have the phenomenon of corrosion and slag.

6.Aluminium and alloys.          

Aluminum cutting is a melting laser cutting mechanism, which is mainly used to blow away the molten product from the cutting area. For some aluminum alloys, it should be noted that the prevention of micro cracks on the surface of the cutting seam is noticed.

7.Copper and alloys.         

Copper (copper) because the reflectivity is too high, basically can not use CO2 laser beam cutting. Brass (Red copper) using a higher laser power, auxiliary gas using air or oxygen, can be a thin sheet of cutting.

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Effect of laser output power on laser cutting

Effect of laser output power on laser cutting 
When using laser cutting machine,the laser output power is a parameter that has a direct relation with the melting ability of the processed. For getting good effect of cutting,we need increase the output power in order to improve the processing ability.

Improve processing capacity:
1, improve the laser cutting speed.          
2, increase the thickness of the processing plate.          
3, processing of aluminum, copper and other high reflection spectral reflectance factor.          
4, zoom lens from the short focal length lens.          
5, the focus of the location from the surface of the processed material changes.

We can determine whether the use of the processing conditions of the output energy is appropriate, according to the processing of the cutting surface and machining in the case of the spark. When the output power is much larger than the standard value, the thermal effect of the incision increases, and the melting loss occurs at the corner. And cut the noodles to become thick, from the upper to the lower part of the vertical.
If the output power value is far less than the standard value, the lower part of the cut is significantly thicker, become the state of digging into. And with the increase of the amount of adhesion of slag, it is difficult to remove. Mars is lagging in the cutting process in the opposite direction in the cutting process.
Suitable for the processing of the output conditions exist within a certain range, the thinner the thickness of the processing board, the wider the range of output conditions. Output processing in proper conditions, the cutting surface streak fine, lower relative to the speed of light slow.

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The differences of Fiber laser,YAG laser,CO2 laser and disk laser

The differences of Fiber laser,YAG laser,CO2 laser and disk laser

CO2 laser is also known as carbon dioxide laser, it is composed of CO2 gas and nitrogen, hydrogen and other gases, to 10.6nm laser wavelength for the laser beam to produce more than 20 kW of power, can realize the continuity of the work, is often used in laser marking machine, laser cutting machine, and should be used quite widely. Because of its gas pipe composition, so should pay attention to the use of a lot of problems, in order to avoid adverse consequences, the following is a brief analysis of the matter and CO2 laser and other lasers.The difference between CO2 laser and other lasers

Photoelectric conversion rate:

Fiber laser reached 30%,YAG solid state laser is only 3%,CO2 laser 10%,Laser disc reached 15%.

Maximum output power:

Fiber laser reached 50kW,YAG solid state laser 6kW,CO2 laser reached 20kW,The disc laser reached 8kW.

BPP (4/5kw) aspects:

Fiber laser is less than 2.5,YAG solid state laser is about 25,CO2 laser reached 6,The laser disc is about 8.

Semiconductor pump life:

Fiber laser can work continuously for more than 10 million hours, YAG laser can be about 1000h, CO2 laser is expected at about 5 000 h, disk laser life about 1 million hours.

Maintenance and operation cost / hour (4/5KW):

Fiber laser per hour 2 yuan, YAG solid laser 35 yuan per hour, CO2 laser per hour 20 yuan, disk laser per hour 8 yuan.

Maintenance aspect:

Fiber laser no need maintenance,YAG laser and laser discs need regular maintenance,CO2 laser needs to be maintained.

Flexible machining aspect:

Fiber laser is very suitable,YAG laser and laser disc,CO2 laser is not suitable for flexible machining.

Stability aspect:

Optimum stability of fiber laser,CO2 laser and laser disc stability,The stability of YAG solid state laser is not very good.

Absorption% - Steel

Fiber laser, YAG laser, laser disc is about 35, CO2 laser is about 12.

Aluminum absorption%

Fiber laser, YAG laser, laser disc is about 7, CO2 laser is about 2;

Parts to be replaced:

Fiber laser has a high brightness broadband single core junction semiconductor laser, pumping time of more than 200 thousand H. A semiconductor is damaged, replace only $300~500, because each semiconductor pump source is independent of each other;YAG laser is pumped;CO2 laser is to add gas;The disc is mainly laser pumping source needs to be replaced frequently, each change between $20~23 million.

Fiber laser cutting machine is not a panacea, pls don't cut these materials with it

Fiber laser cutting machine is not a panacea, pls don't cut these materials with it
 

Many people believe that the fiber laser cutting machine belongs to the cutting machine category, and adopt imported laser, cutting range should be very wide, the effect should be much better than the other way, actually otherwise, cutting machine also are in special types, each cutting machine has his advantages and disadvantages.The following are analyzed in detail.

First, fiber laser cutting machine belongs to metal laser cutting machine processing category, so only for cutting metal, which cannot be cut fabrics, leather, stone etc. nonmetal, the reason is very simple, fiber laser cutting machine in the wavelength range not within the absorption range, or ceiling are not suitable, amounting to less than the desired effect of cutting, at present,
application in non metal cutting edge is not very obvious, of course does not preclude later with development needs in this regard.

Secondly, we don't recomend fiber laser cutting machine cut aluminum, copper and this type materials in long-term,because these materials belong to high reflective material (Note: high reflective sheet with the cutting surface smooth degree of concern is not big, mainly due to the wavelength of the laser not in these materials ideal absorption range, absorption effect is not good, most of the energy is reflected back, easy to damage protection lens in front of the laser head), the cutting effect is not good in long-term working . It will also increase the usage of consumables;

Finally,with the different power of fiber generotor,the cutting thickness is also different.The more power,the cutting thickness is more.And cutting thin metal,the speed is faster.Fiber laser cutting machine is very obvious for thin sheet cutting edge.

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What auxiliary gas can be used laser cutting?

What auxiliary gas can be used laser cutting?

Laser cutting machine can use the auxiliary gas when cutting, mainly oxygen, nitrogen, air and argon, and the following we will introduce its use and characteristics for different auxiliary gases.

1.Atmosphere

Air can be supplied directly from the air compressor, so the price is very cheap compared with other gases. Although the air contains about 20% of the oxygen, but the cutting efficiency is far less than oxygen, cutting capacity and nitrogen. The cutting surface will appear micro film, but it can be used as a measure to prevent the film from falling off. Cut end face yellow.
The material is mainly applicable to aluminum, aluminum alloy, stainless steel, brass, galvanized steel, non metal and so on.

2.Nitrogen

Some times,when we cut some metal material,the cutting surface will form oxide film,adopt nitrogen can invoide the oxide film.The non oxidation cutting mask has the characteristics of direct welding, coating, corrosion resistance and so on. Cut face is white.
The main application of the plate are stainless steel, galvanized steel, brass, aluminum, aluminum alloy, etc.

3.Oxygen

Mainly used for cutting carbon steel in laser cutting machine. Using oxygen reaction heat large format improve cutting efficiency at the same time, resulting in the oxide film can improve the reflective material beam spectrum absorption factor. Cut face is black or dark yellow.
Is mainly used for rolling steel, solution and connecting structure of rolled steel, mechanical structure with carbon steel, high tension version, tools in, stainless steel, galvanized steel, copper and copper alloys.

4.Argon

Argon is inert gas, used in the laser cutting machine to prevent oxidation and nitriding, also used in welding, compared with other processing gas, the price of Japonica rice, the corresponding increase in cost. Cut face is white.

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Operating process of fiber laser cutting machine

Operating process of fiber laser cutting machine

Today, the fiber laser cutting machine has become an indispensable processing equipment in the modern sheet metal industry, with industrial upgrading, processing requirements upgrade, not only improve the efficiency, the operation is also optimized, below, I will introduce the concrete operation of the process for you.

Operation procedure of optical fiber laser cutting machine:

1.Make sure the material of working,and put the material on the table of machine and fix it.Then pls make sure the material is stable in the table of machine,lest it moves when cutting,cause bad accuracy of working.

2.Operate the control system and import the design of cutting,set the thickness and other parameters in software.Then adjust the laser head and nozzle for getting good laser focus position.

3.Start the manostat and water chiller,pls set the suitable water temperature and pressure.

4.Start the laser generator and start laser cutting machine.

The above 4 points are easy and short,but in the actual operation need more thim for exercise.We should be very familiar with all details of operation,invoide the problem even fault in the cutting.Below,i will share some fault experiences.

When you start the machine,but no response.

1.Pls check whether the power insurance burn,if yes,pls change new one.
2.Power input is normal: check the power input and make it normal.
3.Total power switch is damaged: replace the total power switch.

No laser or laser is weak

1.If laser path is shifting,pls adjust the laser path.
2.If the laser focus is right,pls check and change it.
3.If laser generator is demaged,check and change it.
4.If laser generator is power on,make it power on.

The size of working is not right or be in wrong action.

1.pls check if the signal line.
2.The power supply is not stable or be in interference signal.Pls use the manostat and eliminating interference signal.
3.Check the parameters of working.
4.Check the preparation of the processing procedures, and modify it to make it normal

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Advantages of laser cutting machine in the shipping industry

Advantages of laser cutting machine in the shipping industry

There are four main types of ship hull plate parts, which are flame cutting, plasma cutting, cutting and laser cutting.
1.Equipment performance comparison
The cutting performance of the flame cutting machine can be carried out by the cutting machine. The plasma cutting machine is fast and the cutting machine has high efficiency, but it can only be limited to the machining of the linear side parts. But the cutting plate speed is relatively slow. It is due to the advantages of high precision, laser cutting machine in high sheet product construction, block construction process without allowance precision management, build merchant ships of welding groove line of demanding process: such as FCB puzzle, double wire submerged 4 arc automatic welding and other aspects, has irreplaceable advantages, the laser cutting machine is to change the smooth implementation of the method has laid an important foundation.

The comparison of the parameters of the laser cutting machine and the other two kinds of cutting equipment is listed:
Application of laser cutting machine in the actual production of shipping industry
Through comparison of the performance of laser cutting equipment and other equipment, the main advantages of the laser cutting equipment are cutting high precision and small thermal deformation. This feature has a broad application prospect in the practical production.
There is no allowance for advancing the process of building a new high tech ship
High precision requirements for ship hull zhuanpei high frame, zhuanpei gap must be controlled in the range of 1mm. In a bottom part EB02 for example, formerly in the plasma of floor plate material, in order to ensure the assembly gap, in the coal floor are set to mow the margin (as shown in the following picture), the allowance of the ribbed plates are is in the field assembly manual to mow, mow the quality parameter difference not neat inner slotted oxides are not clear and easy to, but also increase the workload of the assembly, assembly cycle of growth, resulting in the block construction period is prolonged. Using laser cutting machine to improve the accuracy of parts, in the relative to cancel the assembly margin, the structure of the assembly speed is significantly accelerated. The assembly quality of the whole block is improved obviously, and the precision of the construction is also improved at the same time. The fact proves that the more accurate parts are good for the main dimensions of the segmented.
Promote the change of thin plate cutting
Section thin-walled superstructure construction division is an important part of the whole high engineering hull construction, the thinnest thickness coaming of only 2mm; in the superstructure segment in the process of the construction, expect from the next parts manufacturing, block manufacturing, total group equipped with a series of processes are in the hands of the process, thin wall plate is very easy to lose stability deformation. So section thin-walled superstructure construction of each process are key control, and it is the introduction of laser cutting machine, promote the thin-walled material engineering change. To ensure the quality of the construction of the sub construction.
Before the introduction of laser cutting machine, the cutting of the 2-3mm cutting of the sheet is mainly through the manual line. Through Zhaping were leveling; artificial marking and shear cumulative error in 3mm, resulting in in wall imposition assembly of ultra poor gap, unable to realize the assembly gap in the range of 1 mm requirements, tend to have a lot of modification cutting phenomenon; and for 4 6mm steel plate, using ion cutting, because of the thin sheet metal, the cutting heat, steel plate edge straightness is not up to the requirements, after cutting Zhaping, still need the edge planing machine for edge processing, an increase of machining process.
To the Ministry of loading stage, there are a large number of wall due to the material error or scrap or rework, and in the sub wall assembly, the wall edge potential repair or assembly gap is endless, and the material is not used in the cutting machine before the material scrap rate is high. Introduction of laser cutting machine thick, it is using its high processing precision, small heat input, all thin wall are used laser cutting and blanking, step in place, eliminating the need for the lineation, Zhaping, planing process; to eliminate the problems caused by plate's loss, greatly improve the processing efficiency.
It is clear that the use of laser cutting machine for thin plate cutting is a process of change. Greatly improve the efficiency and quality of the thin wall segment processing.
In short, laser cutting machine as a new type of hull parts cutting equipment, compared with other conventional cutting equipment, with high machining accuracy, small thermal deformation, good stability, low loss rate, small environmental pollution and other advantages, in the shipbuilding industry has great potential for application. Currently in in section of high ship building without remainder, sheet cutting method change has good application, greatly improving the processing efficiency, eliminating the on-site repair cut phenomenon, reduce the labor and material waste. The advantage of laser cutting machine will be wider and deeper application in ship manufacturing.

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Maintenance of laser machine

Maintenance of laser machine

Laser machine must be maintained in order to use a more permanent.

1.Replacement of water and clean water tank

Suggestion: wash the laser tank and replace the circulating water once per week
Note: Before open the machine must ensure that the laser tube is filled with circulating water.
The water quality and the water temperature of the circulating water directly affect the service life of the laser tube, it is recommended to use pure water, and the water temperature is controlled at 35 degrees Celsius. For more than 35 degrees Celsius to replace the circulating water, or add ice to water to reduce the water temperature, (recommend that the user choose a water chiller, or use two water tanks).
The tank cleaning: first turn off the power supply, the water inlet pipe is pulled out, so that the laser tube water automatically flows into the water tank, water tank is opened, remove the water pump, clear water pump on the dirt. The cleaning tank clean, replacing the good water circulation, water return tank will connect to pump water pipe is inserted into the water inlet, the joint order. The pump is powered by a single pass and run for 2-3 minutes (the laser tube is filled with circulating water).

2.Fan cleaning

Use the wind turbine for a while, the wind machine inside accumulate a lot of solid dust.The fan produces a lot of noise, but also not conducive to the exhaust and odor. When appear fan inadequate suction exhaust is not smooth, please turn off the power, wind turbine air inlet pipe and an air outlet pipe, remove dust inside, and then inverted fan and pulling the wind leaf relief until clean, and then install the fan.

3.Lens cleaning

There are three mirrors and a focusing mirror (No. 1 mirror is located in the laser tube's launch exit, which is the upper left corner of the machine.
No. 2 is located in the left end of the beam reflector,
No.3 mirror is at the top of the fixed part of the laser head, poly focal lens in the lens barrel is arranged at the lower part of the laser head can be adjusted).
The laser is reflected through the lens, focusing from the laser hair shot out.
Lenses are easily stained with dust or other contaminants, resulting in the loss of laser or lens damage, No. 1 and No. 2 lens cleaning should not be removed, only to be dipped in a clean liquid of the mirror carefully along the central edge of the lens to the edge of the rub.
Note: 1. The lens should be gently wipe, do not damage the surface coating; 2. Clean the process should be handled with care, to prevent the fall; 3. Focusing mirror installation please be sure to keep concave downward.
The 3 lens and the focusing mirror is removed from the frame, use the same method to wipe, wipe after it is put into the can.

4.Cleaning of guide rail

Guide, linear axis, as one of the core components of the device, its function is to guide and support. In order to ensure that the laser machine has higher accuracy, it is required that the guide rail, straight line has a high accuracy and good motion stability. In the process of operation, because of the large amount of corrosive dust and smoke, the smoke and dust in the process of processing will produce a lot of dust and smoke.The smoke and dust be in a long time, a large number of deposits in the rail, linear axis surface, the machining accuracy of the device has a great impact, and will be in the guide line of the formation of pitting, shorten the service life of the equipment.

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