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Common malfunction analysis of metal stamping parts

Stamping is the first of the four technologies, and its importance can be imagined. The quality of stamping products will lay a reliable foundation for the appearance and performance of the vehicle. Therefore, the quality assurance of stamping parts has always been a very important issue for automobile manufacturing enterprises.

According to the practical experience of quality management in our stamping factory, this paper summarizes the causes and Countermeasures of common problems in the production process of metal stamping parts, hoping to provide some useful reference for improving the quality of stamping parts in the same industry.

1 Why do metal stamping parts appear distortion?

Stamping parts in progressive die, by punching the periphery of stamping parts to form the shape of the stamping parts. The main cause of stamping and twisting is punching force. In blanking, due to the existence of blanking clearance, the material is stretched on one side of the die (material warped upward), and compressed on the side of the punch. When the unloading plate is used, the material is pressed by the unloading plate to prevent the material on the side of the concave die from warping upward. At this time, the material’s stress state changes correspondingly. The material near the punch side is stretched (the compressive force tends to decrease) and the material on the die surface is compressed (the tensile force tends to decrease) with the increase of the pressure on the discharging plate. The rollover of stamping parts is due to the tensile strength of the material on the die surface. Therefore, pressing and compressing material during blanking is the key to prevent the material from turning and twisting. Causes and Countermeasures of stamping and twisting during stamping.

The punching edge is caused by blanking. We need to study the punching edge, and pay attention to check whether the blanking clearance is reasonable.

The turning and twisting deformation of the punched parts have occurred during blanking, resulting in poor forming after bending, which should be solved by blanking workstation.

The instability of stamping parts is caused by bending. Mainly for U and V bending. To deal with this problem, the key points are the guide position before bending, the guide position during bending, and the pressing material to prevent the stamping parts from slipping during bending.

2 why do metal stamping parts cause tear?

The common form of tearing and skewing for metal stamping parts is blanking and punching – punching incision – flanging forming – incision – flanging. There are various forms of tearing and skewing in the forming process of the intermediate face shield bracket. The tearing parts are mainly distributed at the pass of the part, the junction of R arc and neck at the corner of the side wall and so on. Tearing can be either a one-off plastic tear or a tear caused by the development of a fatigue crack, i.e. an invisible crack.

According to the actual situation on the spot and by checking the tearing position, fracture morphology and the degree of extrusion, it is considered that the tearing and skewing behavior of the workpiece is mainly reflected in the flanging forming process. The causes of this process phenomenon are as follows:

The forming process parameters are not in place. In the forming process, the concave die, the pressing core and the two parts must be tightly bonded together, and the plastic deformation of the sheet metal is compressed when the slider of the machine tool slides. But now, the quality of the pressed parts is unstable, which shows that the machine pressure is in an unbalanced state in the production process. The main reason is that the processing technicians did not adjust the machine pressure in time according to the requirements of process specifications at this stage, or did not communicate with each other in the handover of each shift pressure stability information, resulting in unstable parts quality.

The design of flanging die is defective. The mold is a common one with double cavity left / right parts. Because of the contents of this process, besides the flanging, it also has the shape forming content, and the parts are special and complex, and the bending surface is narrow. The forming requires the concave die core to match the forming face, which results in the large forming stroke and small pressing area of the mold. In the initial mold design, the designer only considered the small blank surface, but neglected the sliding stroke of the core forming.

3 why is the surface quality of metal stamping parts bad?

There are many reasons for the surface quality problems of stamping products. The surface quality of coil, sheet metal and die will affect the quality of final stamping parts. The operation in stamping process and the clamping and unloading of workstation tools may also damage the surface quality of stamping parts. Therefore, the surface quality of stamping parts should be fully considered in every step of the whole manufacturing process. Consider details, try to avoid quality problems and affect the final appearance of products.

The prospect of mould industry

Our country is gradually moving towards a powerful country of mould making from the big country of mould production. As far as the domestic market is concerned, the production and demand of the mould industry are booming, the investment enthusiasm of the enterprises is rising, and the large technical renovation projects and new projects are constantly appearing. In addition, the construction of industrial clusters has been accelerated. With the support of preferential policies of the government, more than 100 mold cities (or mold parks, agglomeration production bases, etc.) have been built in China, and more than 10 are under construction, preparation or planning. Mould associations and virtual manufacturing are being developed in some places, and these have some advantages similar to clustering.


For foreign markets, China’s mould industry has performed equally well. While the mold industry is advancing steadily in the traditional market, it is actively exploring emerging markets, even the marginal markets which were neglected in the past have been developed. Driven by the development of LED lighting and display, rail transit, medical equipment, new energy, aerospace, automobile lightweight, rail transit and other fields, the level of China’s die industry has been significantly improved. These factors make the die market development remarkable. According to statistics, China’s mold has been exported to more than 170 countries and regions, and it can be seen as a brilliant result.

Hardware painting knowledge

One, bottom wood

Hardware paint substrate: cold-rolled steel sheet stamping parts or sheet galvanized steel sheet stamping parts or sheet magnesium alloy stamping parts or sheet aluminum alloy stamping parts or sheet metal but the paint process is very different


Two, hardware baking process

Pretreatment, drying, primer painting, baking, topcoat painting, baking, inspection, packaging

Three. Surface pretreatment

(1) 1 degreasing; 2 washing; 3 rusting; 4 washing; 5 table adjustment; 6 washing; 7 phosphating; 8 washing; 9 washing; 10 drying;

(2) Purpose and importance of pretreatment: – The purpose of pretreatment is to obtain a good coating, because the above stamping parts will have grease, oxide rust skin, dust, rust and corrosive substances on the surface during manufacturing, processing, handling and storage, if not removed, will directly affect the performance of the coating, appearance, etc. Pretreatment plays a very important role in painting process.

(3) Significance of pretreatment: – Pretreatment and coating, drying are the three main processes of coating process, of which coating pretreatment is the basic process, it has an important impact on the whole coating quality, coating life, coating appearance and so on – through degreasing, rust removal, phosphating and other processes after the surface of the workpiece clean, uniform No fat.

1. Oil removal: mineral oil, grease, animal and vegetable oils, such as hand-touched oils during operation and transportation, greatly reduce the adhesion of most coatings, and affect their drying, but also reduce the hardness and gloss of the coating. The main alkali is NaOH, NaHCO3 and so on. Special degreasing powder can be purchased and then mixed into water solution. The saponification of soap.

2, rinse with water, so as not to contaminate the solution in the previous process to the next process. Clear water must be alive.


3. Removal of rust and yellow rust can promote the spread of corrosion products under the coating and make the coating lose shielding and impermeability. Under high temperature and humidity conditions can lead to early damage of coatings and metals, loose yellow rust, poor adhesion, and can fall off with the coating. There are many methods of rust removal, such as alkali method, acid method, mechanical method, electrolysis, etc., the common is alkali method. Remove the oxide scale and rust from the surface of the workpiece by chemical solution, usually with sulfuric acid and oxalic acid. It can also be supplemented by ultrasonic cleaning.

4. The abbreviation of surface adjustment (neutralization): remove the excess alkali (or acid) from the rust removal process by acid (or alkali) solution, adjust the pH value as neutral as possible, that is, PH = 7; function: accelerate the phosphating speed, refine the phosphating crystallization, increase the crystallization point of phosphating;

5. Phosphating is the central link of pretreatment before coating. Phosphoric acid manganese, zinc, cadmium orthophosphate solution is used to treat metal workpiece, so that an insoluble phosphate protective film is formed on the surface of the workpiece. The phosphating film has a compact structure of fine pores, enlarges the surface area of the workpiece, and enlarges the contact surface of the coating. As a result, a favorable mutual penetration between the phosphating film and the coating is created, and the adhesion of the organic coating to the workpiece is greatly improved. The phosphating film formed by phosphating is a stable and non-conductive isolation layer, which makes the metal surface from good conductor to bad conductor, inhibits the formation of micro-battery and effectively prevents the corrosion of coating. The commonly used phosphating methods are divided into high-temperature phosphating (70-90 C), medium-temperature phosphating (50-70 C) and room-temperature phosphating (20-30 C). Phosphating film is usually black.

6, drying process is basically carried out in the water tank. And each process has time limit. Dry the water and prepare the paint.

Four. Inspection before hanging.

Check the appearance of the unpainted workpiece before going on line; a large part of the unpainted defective products should be inspected for direct spraying or removal of the old paint; remove the old paint method, solvent soaking cleaning or removal with a special paint remover.

Five, grinding

Non-essential process, remove surface granular impurities and increase a certain degree of roughness to increase paint adhesion; first pass: 400 # sandpaper second pass; 800 # sandpaper or finer.

6. The hanging device hooks the product on the hanging device, the hanging device conducts electricity and moves along with the pipeline; the hanging device should be conductive and grounded (for electrostatic coating); the hanging device is generally customized according to the different characteristics of the product; a large number of the whole pipeline turnover use.

Seven, dust removal, surface dust, hair and so on; compressed air; electrostatic precipitator gun; flame combustion;

8. Pre-spraying of low potential (such as shadows, concave parts, etc.) before automatic spraying is necessary, but it is also the choice when there is no automatic spraying equipment. The efficiency is not high, the productivity is limited, there are many unstable factors, the bad rate is high, and the thickness of the film is uneven manual spraying equipment mainly includes air compressor. Gas pipeline, air oil and water separator, spray gun, paint container, spray booth and so on. The types of spray guns are:


1, gravity type;

2, suction type;

3. Press delivery.

9. Disk spraying automatic spraying belongs to the category of electrostatic spraying. The high voltage difference between spraying device and grounding workpiece produces electrostatic force. The coating is thrown out by the centrifugal force produced by Disk at a fixed speed. After spraying the electrostatic spraying coating on the workpiece, the Disk moves up and down to cover the whole workpiece. It is a rotating disk electrostatic spraying equipment, also known as centrifugal electrostatic atomizing equipment, rotating speed of the rotating disk is 5 000 ~ 60 000 R / min, working voltage is: 70 ~ 120 KV, using air motor drive, electrostatic coating used electrostatic coating, coating.

Four peculiarities of mold processing

Compared with other machining, mold processing has its own particularities. What are these particularities?


1. With the increasing precision and complexity of the mold products, the requirement of the mold machining precision is also getting higher and higher. Now the machining accuracy of many molds has reached 6550

2. Most die shapes are cuboid or cuboid, few are narrow and long, and the main processing amount is concentrated on the concave die and punch.

3. Most moulds need to produce complex spatial curved surfaces on solid metal modules. With the development of large-scale moulds, the weight of the modules will become larger and larger, and some of them have reached dozens of tons.

4. With the shorter and shorter production cycle, the mold processing must meet the requirements of high efficiency, fast, flexible and long-term full-load non-stop operation.

What are the common defects of screw fasteners

When using screw fasteners, we will see that some screw fasteners do not look very good, and some will have cracks. What are the surface defects of screw fasteners? The following high-strength standard parts of the small program to talk about a simple, common screw fastener defects; convenient for you to buy screw fasteners in the future when there is a direction.

First, crack

Cracks are usually caused by excessive stress in a metal during forging or other forming or heat treatment.

Among them are quenching cracks, forging cracks, forging bursting, shearing bursting.

1. Quenching cracks may occur during heat treatment due to excessive thermal stress and strain. Quenching cracks usually appear on the surface of fasteners with irregular intersecting and irregular directions.

2. Forging crack forging cracks may occur in the cutting or forging process, and located on the top of the screw head, as well as the protrusion part of the cavity head.

3, forging burst may occur during forging process.

4. Shear burst.

Shear burst may occur during forging, as in the circumference of the round head or flange head screw or flange face, usually about 45 degrees from the axis of the screw.

2. The crack or strip of raw material is usually a thin straight line or smooth curve extending along the longitudinal direction of thread, bare rod and head. It is usually the inherent defect of the manufacturing material of fasteners.

Three, dent dents are shallow holes or dents on the surface of screws. There is a rush or imprint caused by chips or cutting burrs or rusty layers of raw materials that cannot be eliminated in the forging or upsetting process.

Four, wrinkles and wrinkles are metal folding on the surface of fasteners during forging. In the process of one impact forging, wrinkles occur due to the displacement of the material caused by insufficient volume and different shapes.

Five. Cut marks are shallow grooves in longitudinal or circumferential directions. It is due to the movement of the tool beyond the surface of the screw.

Six. Damage screws on any surface. Produced in the manufacture and transportation of screws by external influences.
The above six are the common defects of screw fasteners, we must pay attention to the surface of the screw when we buy screw fasteners to see if there are any of these defects.

Main types of casting process

The main process of casting includes metal melting, model making, pouring solidification and demoulding cleaning. The main materials used for casting are cast steel, cast iron, casting nonferrous alloys (copper, aluminum, zinc, lead, etc.).

Casting process can be divided into sand casting process and special casting process.

Folding special casting process


Special casting processes include centrifugal casting, low pressure casting, differential pressure casting, pressurized casting, plaster casting, ceramic casting and so on.

Pressure casting

Pressure casting refers to the casting process of molten metal under the action of other external forces (without gravity). The broad sense of pressure casting includes die casting and vacuum casting, low pressure casting, centrifugal casting, etc. The narrow sense of pressure casting refers to die casting machine metal mold pressure casting, referred to as die casting. These casting processes are the most commonly used and the lowest price in the nonferrous metal casting at present.

Metal mold casting

Metal mold casting is a modern technology of hollow casting mold made of metal (heat-resistant alloy steel, ductile iron, heat-resistant cast iron, etc.).

Metal mold can be either gravity casting or pressure casting. The metal mold can be used repeatedly. Each time the molten metal is poured, a casting is obtained. The life is long and the production efficiency is high. Metal mold casting not only has good dimensional accuracy and smooth surface, but also has higher strength and less damage than sand mold under the condition of pouring the same liquid metal. Therefore, in the mass production of non-ferrous metals in medium and small castings, as long as the melting point of the casting material is not high, generally preferred metal mold casting. However, metal mold casting also has some drawbacks: because heat-resistant alloy steel and the manufacture of hollow cavities on it are more expensive, so the metal mold costs a lot, but overall and die-casting mold costs are much cheaper than. For small batch production, the cost of the mold apportioned to each product is obviously too high, generally unacceptable. Because the metal mold is limited by the mold material size and cavity processing equipment, casting equipment capacity, so it also appears powerless to the particularly large castings. As a result, metal mold casting is seldom used in small batch and large piece production. In addition, although the metal mold used heat-resistant alloy steel, but the heat resistance is still limited, generally used in aluminum alloy, zinc alloy, magnesium alloy casting, copper alloy casting has been less used, but less used in ferrous metal casting.

Die-casting


Die casting is a metal mold die casting on the die casting machine, which is the highest production efficiency casting technology at present.

Die casting machine is divided into two types: hot chamber die casting machine and cold chamber die casting machine. Hot-chamber die-casting machine has high degree of automation, less material loss and higher production efficiency than cold-chamber die-casting machine. However, due to the heat resistance of the machine, it can only be used in the production of zinc alloy, magnesium alloy and other low melting point materials. Nowadays aluminum alloy die castings widely used can only be produced on cold chamber die casting machines due to their high melting point. The main feature of die casting is that the liquid metal fills the cavity under high pressure and high speed, and forms and solidifies under high pressure. The shortcomings of die casting are that the air in the cavity is bound to be trapped in the inner part of the casting inevitably during the filling process of the liquid metal under high pressure and high speed, thus forming the subcutaneous pores. It is not suitable for heat treatment. Zinc alloy die castings should not be sprayed (but can be painted). Otherwise, when the internal pores of the casting are heated by the above treatment, the casting will be deformed or bubbled due to thermal expansion. In addition, the machining allowance of die castings should also be smaller, generally around 0.5mm, which can not only reduce the weight of the castings, reduce the amount of cutting to reduce costs, but also avoid penetrating the surface of the dense layer, expose subcutaneous pores, resulting in scrap of the workpiece.


Melt mold casting


Lost wax casting, now called investment casting, is a kind of casting technology with little or no cutting. It is an excellent casting technology in the foundry industry, and it is widely used. It is not only suitable for casting of various types and alloys, but also for producing castings with higher dimensional accuracy and surface quality than other casting methods. Even castings which are difficult to be cast by other casting methods are complex, high temperature resistant and difficult to be processed. Investment casting can be used for casting.

Investment casting is developed on the basis of wax pattern casting in ancient times. As an ancient civilized country, China is one of the countries that used this technology earlier. As far back as centuries BC, the ancient working people in China created this lost wax casting technology, which was used to cast clocks, tripods and utensils with various fine patterns and characters, such as the Chunqiu Zeng Hou Yi tomb plate. The pedestal of the grave of Zeng Houyi is a series of intertwined dragons, which are interlaced at the top and bottom to form a multi-layer moire pattern in the middle. These patterns are difficult to be made by ordinary casting technology, but the paraffin wax casting technology can be used to make them without strength and easy to carve. The exquisite Zeng Hou Yi tomb tray can be obtained by carving the same paraffin material as the tray of Zeng Hou Yi tomb, and then adding pouring system, coating, dewaxing and pouring.


The modern investment casting method was applied in industrial production in 1940s. The development of jet engines at that time required the manufacture of complex shapes, precise sizes and surfaces such as blades, impellers and nozzles.

Mechanical maintenance

Whether the manufacturer for after-sales maintenance and maintenance of machinery, whether it is new or old customers for their own maintenance and maintenance of equipment, must pay attention to their own, no matter how good equipment do not know maintenance and maintenance, equipment life will never be big.

This is the first stage of troubleshooting. It is a crucial stage. The following tasks should be done:

(1) When inquiring and investigating, when receiving the information of troubleshooting in the machine tool field, the operator should be asked to keep the fault status as far as possible and not to do any treatment, so as to analyze the cause of the fault quickly and accurately. At the same time, the fault indication, fault appearances and the background of the fault are carefully inquired, and a preliminary judgment is made on the basis of which, in order to determine the tools, instruments, drawings and spare parts that should be carried by the site troubleshooting, and to reduce the round-trip time.

After the on-site inspection arrives at the scene, the accuracy and completeness of various situations provided by the operator should be verified first, so as to verify the accuracy of the preliminary judgment. Due to the operator’s level, there are many cases of unclear or even completely inaccurate description of the fault situation, so after arriving at the scene still do not rush to deal with, re-careful investigation of various situations, so as not to damage the scene, making troubleshooting more difficult.

(3) Fault analysis according to the known fault status according to the fault classification method described in the preceding section to analyze the fault type, so as to determine the principle of troubleshooting. Because most of the faults are indicated, it is generally possible to list the possible causes of the faults by comparing the diagnostic manuals and instructions of the CNC system matched with the machine tools.

(4) Determine the cause and find out the real cause of the fault through the investigation of various possible causes. At this time, the maintenance personnel is a comprehensive test of the machine tool’s familiarity, knowledge level, practical experience and ability to analyze and judge.

_Troubleshooting methods for troubleshooting preparation may be simple, and some faults are often more complex, requiring a series of preparatory work, such as the preparation of tools and meters, partial disassembly, repair of parts, procurement of components and even troubleshooting planning steps and so on.

Safety operation rules for cutting machines

1.1 In order to implement the policy of “safety first, prevention first”, strengthen safety management, enhance safety awareness, ensure safe production, eliminate people’s unsafe behavior, the unsafe state of things, so that safety production can be followed by rules, there is evidence to follow, this regulation is specially formulated.

1.2 Operators must strictly abide by the relevant provisions of “Safety Management System for Chemical Enterprises” and “Prohibition of Chemical Safety Production”.

1.3 this regulation is applicable to the maintenance personnel of each workshop.

2, operation procedures

2.1 before wearing objects, wear gloves (gloves, respirators and glasses) to prevent splashes from hurting people.

2.2 Cutting machine must be checked before use whether it can be used normally (such as the power cord is damaged, cutting blade is closely related to whether there is damage, etc.).

2.3 When replacing the cutting blade, first turn off the power supply and hang the warning board. The cutting blade must be concentric and tightened so as not to fall off and hurt people.

2.4 the cutting machine must be used in the designated rooms of the workshop, and can not be cut into inflammable and human.

2.4 when starting, check whether the cutting machine is running in the right direction.

2.5 when cutting machine, the object must be clamped.

2.6 when cutting objects, force should be steady. During operation, if the cutting piece is damaged, it must be stopped immediately, and replace the intact cutting piece before running.

2.7 After cutting, first turn off the power supply, when the grinding wheel stop rotating, then take the object, so as to avoid flying cutting blade injury.

Does the quality of laser welding machine affect the stability of laser beam

There is no need to use electrodes in laser welding machine, there is no electrode pollution or damage concerns. And because it does not belong to the contact welding process, the wear and deformation of the machine can be minimized. The beam energy characteristics of laser welding machine mainly include the wavelength of laser beam and the power and power density of laser beam. The quality of the laser welding machine will directly affect the stability of the laser beam.

Laser power density plays a major role in laser welding. This is because there is a critical power density threshold for different materials. Only when the power density of the laser focus exceeds this threshold, can the keyhole be formed and the deep penetration welding be obtained. This is of great significance for CO2 laser beams with wavelength of 10.6 m. Because metal materials are strongly reflective of such wavelengths of laser beams. Such

When the laser beam is the base mode, the maximum weld depth to width ratio can be obtained. The higher the order of the beam mode, the more divergent the energy distribution of the laser beam, and the worse the welding quality. The influence of laser beam with different focusing characteristic parameter K on the quality of laser welding is studied. The larger the K value of laser beam, the worse the quality and the smaller the depth-width ratio of weld. The power density of porous materials depends not only on the average power density, but also on the maximum power density, which is closely related to the cross-sectional energy distribution.

The relationship between the quality of laser welding equipment and beam mode characteristics, beam mode characteristics include beam quality, beam mode and beam cross-sectional energy distribution. The beam pattern determines the energy distribution of the focused focus, which has an important influence on laser processing.

The quality of the laser welding machine affects the stability of the beam. For a laser welding machine with a fixed power and the same focus radius, the energy distribution of the cross section is different. Although the average power density is the same, the maximum power density is not the same.

Development and application of laser welding machine welding technology

Laser welding machine welding technology is a combination of laser technology, welding technology, automation technology, material technology, mechanical manufacturing technology and product design as one of the integrated technology, and ultimately embodied as a complete set of special equipment, but also as a supporting process. As an important part of advanced manufacturing technology, laser welding technology has a broad application prospect in the future aviation manufacturing industry. The development direction of laser welding technology is mainly in the following aspects

1. laser welding of filler wire

Laser welding machine generally does not fill the welding wire, but the welding parts assembly gap requirements are very high, sometimes it is difficult to ensure in actual production, limiting its application. Laser welding with filler wire can greatly reduce the requirement for assembly clearance. For example, aluminum alloy sheet with a thickness of 2 mm, if no filler wire is used, the gap between the sheet metal must be zero in order to obtain good forming. For example, if the welding wire with a thickness of 1.6 mm is used as filler metal, even if the gap is increased to 1.0 mm, the weld seam can be well formed. In addition, filler wire can also adjust chemical composition or carry out thick plate multilayer welding.

2. beam rotating laser welding

The method of rotating laser beam for welding can also greatly reduce the requirements of welding assembly and beam alignment. For example, when 2 mm thick high strength alloy steel plate is butted, the allowable butt gap increases from 0.14 mm to 0.25 mm, while for 4 mm thick plate, the allowable butt gap increases from 0.23 mm to 0.30 mm. The alignment error of the beam center to the weld center is increased from 0.25mm to 0.5mm.

3. on line inspection and control of laser welding quality

In recent years, the detection of laser welding process by using the signal of light, sound and charge of plasma has become a hot research topic at home and abroad. A few research results have reached the level of closed-loop control. The sensors used in laser welding quality detection and control system and their functions are briefly introduced as follows:

(1) plasma monitoring sensor

1) Plasma Optical Sensor (PS): Its function is to collect the characteristic light-ultraviolet signal of plasma.

2) Plasma Charge Sensor (PCS): The nozzle is used as a probe to detect the potential difference between the nozzle and the workpiece due to the inhomogeneous diffusion of plasma charged particles (positive ions, electrons).

(2) system functions

1) identify which way the laser welding process is. In stable deep penetration welding process, there are plasma, PS and PCS signals are very strong; in stable thermal conduction welding process, there is no plasma, PS and PCS signals are almost equal to zero; in unstable mode welding process, plasma is produced and disappeared intermittently, and corresponding PS and PCS signals rise and fall intermittently.

2) Whether the laser power transmitted to the welding area is normal or not, and when other parameters are fixed, the intensity of PS and PCS signals corresponds to the power incident to the welding area. Therefore, monitoring the PS and PCS signals can be known whether the light guide system is normal, whether the power of the welding area has fluctuations.

3) automatic tracking of nozzle height. The PCS signal decreases as the distance between nozzle and workpiece increases. The closed-loop control based on this law can keep the distance between the nozzle and the workpiece unchanged and realize the automatic tracking of the height direction.

4) focus position automatic optimization and closed loop control. In the range of deep penetration welding, when the beam focus position fluctuates, the plasma optical signal received by PS changes accordingly, and the PS signal is the smallest at the best focus position (at this time the hole is the deepest). According to this rule, the focus position can be automatically optimized and closed-loop controlled, so that the focus position fluctuation is less than 0.2 mm and the penetration depth fluctuation is less than 0.05 mm.

Summary:

While laser welding technology is widely used, it is also continuously studied in depth. In view of its shortcomings, the heating performance of other heat sources is used to improve the laser heating of workpiece. On the basis of maintaining the advantages of laser heating, laser welding with other heat sources is carried out. There are laser and arc, laser and plasma arc, laser and induction heat source hybrid welding and double laser beam welding. Composite welding can increase welding penetration, improve joint performance, reduce equipment costs, and improve welding speed and productivity. In short, laser welding has high production efficiency, stable and reliable processing quality, good economic and social benefits. In an era of endless and renewal of new equipment, new materials, new technologies and new processes, producers should not only understand the characteristics, advantages and requirements of laser welding, but also recognize the many innovations and future trends in this field. Only in this way can they grasp the trend of technological popularity and keep up with the times.