Optimization of Tooling for Laser Welding
In the welding process found that the replacement of different welding products, 300mw laser pointer welding initial proofing time-consuming, mass production process by the accuracy of parts of the weld quality instability and other issues. By optimizing the design of the corresponding tooling to reduce the automatic welding of the proofreading time to ensure the quality of weld and mass production needs.
With the rapid development of industry, laser welding technology in the machinery, rail vehicles, automobile manufacturing, electronics and aerospace has been widely used. When using the existing laser welding equipment of our factory, it is found that it takes a lot of time to calibrate the initial welding point of the parts when the welding products are replaced in the welding equipment. In addition, the parts are clamped by the laser spot size when welding The location of the repeated positioning accuracy requirements are high, so the parts on a process of processing accuracy requirements are relatively increased, thus increasing the processing costs. In order to reduce the auxiliary time of proofreading and reduce the processing cost, we designed the tool changer to change the positioning plate, proofreading the needle, and added the high power laser pointer weld tracking system.
Laser welding system first through the robot welding path of the parts of the mining point, while the welding program is completed, the debugging movement is correct, by the robot to drive the welding head in the protective room on the parts for welding. The original welding system is the welding tooling through the pressure plate directly fixed on the table, only in the same parts only welding problems, when the replacement of different welding parts, found that pre-processed parts and then welding, the corresponding welding tooling In the table before and after the two fixed position offset large parts, parts in place after welding the initial starting point still need to re-proof, increase the welding preparation time. When a different welding part is replaced, the fixture is clamped at a fixed position so that the position of the part weld does not show a large displacement relative to the robot, thereby reducing the number of repetitions of the initial weld.
Laser welding system is through the robot to drive the welding parts of the welding parts, welding the initial point of the collection is equivalent to CNC machine tool processing parts of the knife, a direct impact on the subsequent parts of the processing accuracy. The main factors that affect the quality of burning laser pointer welding are laser power, spot size, welding speed, shielding gas, parts precision and surface quality. Among them, the size of the focus spot in the focusing lens focusing radius for the value of the premise, by the welding head and parts of the distance of the weld. Each time the initial starting point is calibrated, the needle is adjusted to the appropriate height and marked on the needle to replace the focus spot with the focus point to ensure uniformity of the weld height to ensure uniformity of weld width The Proofing is completed, the needle will be raised, away from the focus spot position, to avoid affecting the normal welding.
In the mass production process, because of the deviation of the welding position of the product itself, even if the initial point of welding is corrected accurately, there still exist the phenomenon of partial welding and leakage welding, so the laser welding seam tracking system is increased. Laser seam tracking system by 200mw laser pointer vision sensor to detect the weld trajectory, using image processing software to calculate the weld deviation, then the deviation is transmitted to the robot control system, so as to control the robot driven welding welding head to move to the correct position.
With the positioning plate and proofreading needle through increased job design, reduces the welding proof time of initial point repeat the same product, ensure the uniformity of the quality of weld seam tracking; through the application of the system, effectively ensure the product quality and production efficiency.
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