Modern industrial robots are widely used in welding

Welding robots are industrial robots that are engaged in welding, including cutting and spraying. English name:weldingrobot, industrial robot is a versatile, reprogrammable automatic control manipulator with three or more programmable axes for industrial automation. In order to adapt to different purposes, the mechanical interface of the last axis of the robot, usually a connecting flange, can be fitted with different tools or end effectors. The welding robot is to attach a welding tong or a welding (cutting) gun to the end shaft flange of an industrial robot, so that it can be welded, cut or thermally sprayed.

Welding robot produced by Hyundai Heavy Industries of Korea

With the development of electronic technology, computer technology, numerical control and robot technology, the Korean modern automatic welding robot system integration workstation provided by Wuxi Denver CNC Equipment Machinery Technology Co., Ltd. has been matured since its introduction in the 1980s. Has the following advantages:

1) Stabilize and improve the quality of welding;

2) Improve labor productivity;

3) Improve the labor intensity of workers and work in harmful environments;

4) Reduce the requirements for workers' operating technology;

5) Shorten the preparation period for product modification and reduce the corresponding equipment investment.

Therefore, it has been widely used in various industries.

Welding robot

Welding robots mainly include two parts: robots and welding equipment. The robot consists of a robot body and a control cabinet (hardware and software). For welding equipment, for example, arc welding and spot welding are composed of welding power source (including its control system), wire feeder (arc welding), and welding torch (clamp). For intelligent robots, there should also be sensing systems, such as the stimuli vision system and its control devices.

Basic functions of spot welding robot

Spot welding is not very demanding on welding robots. Because spot welding only requires point control, there is no strict requirement for the movement path of the welding tongs between the points, which is why some robot manufacturers can only produce welding robots, and Wuxi Denver CNC Equipment Machinery Technology Co., Ltd. recommends Hyundai Heavy Industries robots can not only achieve high precision welding surface smoothing in welding stations, but also widely used in handling robots, stamping robots and painting robots. This is a powerful demonstration of the capabilities and strength of a robot manufacturer. which performed. Korea's modern spot welding robot not only has sufficient load capacity, but also has a fast speed when moving between points, smooth motion, accurate positioning, to reduce shift time and improve work efficiency.

Welding equipment for spot welding robot

The welding equipment of the spot welding robot, because the integrated welding tongs are used, the welding transformer is installed behind the welding tongs, so the transformer must be miniaturized as much as possible. For transformers with smaller capacity, 50Hz power frequency AC can be used. For transformers with larger capacity, inverter technology has been used to change the 50Hz power frequency AC to 600~700Hz AC, which reduces and reduces the volume of the transformer. After the pressure change, it can be directly welded with 600-700 Hz AC, or it can be re-rectified twice and welded by DC. The welding parameters are adjusted by the timer. The new timer has been micro-machined, so the robot control cabinet can directly control the timer without the need for an additional interface. The welding tongs of spot welding robots usually use pneumatic welding tongs. The opening degree between the two electrodes of the pneumatic welding tongs is generally only two strokes. Moreover, once the electrode pressure is set, it cannot be changed at will. In recent years, a new electric servo spot welding tong has appeared, as shown in Figure 4. The opening and closing of the welding tongs is driven by the servo motor, and the code disc feedback makes the opening degree of the welding tongs arbitrarily selected and preset according to actual needs. Moreover, the pressing force between the electrodes can also be adjusted steplessly. This new electric servo spot welding tong has the following advantages:

1) The welding cycle of each solder joint can be greatly reduced, because the opening degree of the welding tongs is precisely controlled by the robot, the movement of the robot between points and points, the welding tongs can start to close; After the welding tongs are opened, the robot can be displaced at one side. After the robot is in place, the welding tongs are closed or the welding tongs are fully opened and the robot moves again.

2) The opening degree of the welding tongs can be arbitrarily adjusted according to the condition of the workpiece, as long as no collision or interference occurs to reduce the opening degree as much as possible, so as to save the opening degree of the welding tongs, so as to save the time taken for the welding tongs to open and close.

3) When the welding tongs are closed and pressurized, not only the pressure can be adjusted, but also the two electrodes are gently closed when closed, reducing impact deformation and noise.

Maintenance of welding robot

First, daily inspection and maintenance

1. Wire feeding mechanism. Including whether the wire feed force is normal, whether the wire feed pipe is damaged, and whether there is an abnormal alarm. 2. Is the gas flow normal? 3. Is the torch safety protection system normal? (It is forbidden to turn off the welding gun safety protection work) 4. The water circulation system works normally. 5. Test TCP (recommended to prepare a test program, run after each shift)

Second, weekly inspection and maintenance

1. Scrub the axes of the robot. 2. Check the accuracy of TCP. 3. Check the oil level of the residue. 4. Check if the zero position of each axis of the robot is accurate. 5. Clean the filter behind the welder tank. 6. Clean the filter at the compressed air inlet. 7. Clean the impurities at the nozzle of the torch to avoid blocking the water circulation. 8. Clean the wire feeding mechanism, including the wire feeding wheel, the pressure wire wheel, and the wire guide tube. 9. Check the hose bundle and guide wire hose for damage and breakage. (It is recommended to remove the entire hose bundle and clean it with compressed air.) 10. Check that the torch safety protection system is normal and that the external emergency stop button is normal.

Third, monthly inspection and maintenance

1. Lubricate each axis of the robot. Among them, 1 to 6 axes are white with lubricating oil. Oil No. 86E006. 2. RP positioner and red grease nipple on the RTS rail with butter. Oil No.: Blue oil nozzle on the 86K0073.RP positioner plus gray conductive grease. Oil number: 86K0044. Wire feed needle roller bearing with lubricating oil. (A small amount of butter can be used) 5. Clean the gun device and fill the air motor lubricant. (Normal oil can be used) 6. Clean the control cabinet and welder with compressed air. 7. Check the cooling water level of the welder tank, and replenish the coolant in time (pure water plus a little industrial alcohol) 8. Complete all the items of the weekly inspection in addition to the work of 1-8.

4. The maintenance work of the welding robot is the responsibility of the operator, and the personnel are assigned as follows:

Maintenance records must be added for each maintenance. If the equipment fails, it should be reported to the maintenance in time, and describe in detail the condition of the equipment and the operation before the failure, and actively cooperate with the maintenance personnel to repair, in order to smoothly resume production! The company will conduct random inspections on equipment maintenance. It is recommended that the operator carefully check the condition of the equipment during each shift and record the operation of each equipment.

Welding robot workstation (unit)

If the workpiece does not need to be displaced during the entire welding process, the workpiece can be positioned on the work surface with a clamp. This system is the easiest. However, in actual production, more workpieces need to be displaced during welding, so that the weld is welded at a good position (attitude). In this case, the positioner and the robot can be separately moved, that is, the robot can be welded after the displacement of the positioner; or it can be simultaneous movement, that is, the position of the positioner is changed, and the side of the robot is welded, that is, the displacement is often said. The machine coordinates with the robot. At this time, the movement of the positioner and the motion of the robot are combined, so that the movement of the welding gun relative to the workpiece can satisfy the requirements of the weld trajectory and the welding speed and the posture of the welding gun. In fact, the axis of the positioner has now become an integral part of the robot. This welding robot system can have as many as 7-20 axes, or more. The latest robot control cabinet can be a group of two robots coordinated with 12 axes coordinated motion. One of them is a welding robot and the other is a handling robot for a positioner.

Welding robots are used in automobile production

Welding robots have been widely used in the automotive industry, such as automotive chassis, seat frame, guide rails, mufflers and torque converters, especially in the production of automotive chassis welding. Toyota has decided to use spot welding as a standard to equip all spot welding robots in Japan and overseas. This technique can improve the quality of the weld and even attempt to replace some arc welding operations with it. The exercise time in a short distance is also greatly shortened. The company recently introduced a low-profile spot welding robot that uses it to weld lower parts of the car body. This short spot welding robot can also be assembled with higher robots to work together on the upper part of the body, thus shortening the length of the entire welding line. Domestically produced Santana, Passat, Buick, Sail, Polo and other rear axles, sub-frames, rocker arms, suspensions, shock absorbers and other car chassis parts are mostly force-safe parts based on MIG welding technology, the main components Adopting stamping and welding, the plate thickness is 1.5~4mm on average. The welding is mainly in the form of lap joints and angle joints. The welding quality requirements are quite high, and the quality of the steel directly affects the safety performance of the car. After the application of the robot welding, the appearance and internal quality of the welded parts are greatly improved, the quality stability is ensured, the labor intensity is reduced, and the working environment is improved. (Source: Wuxi Denver CNC Equipment Machinery Technology Co., Ltd.)

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