Development of 6ç250 stainless steel ring seam welding machine Liu Yuxia Guangzhou Institute of Nonferrous Metals Institute of Wear Resistant Materials, Guangzhou, Guangdong 510651, China, automatic self-centering fixture, to ensure the automatic centering and diameter of the upper and lower halves; copper fixture The utility model solves the problem of thermal deformation of the welded closed annular joint, improves the qualification rate and production efficiency of the product, and can replace the workpiece of various diameters by using the replaceable elastic clamp; the required welding speed can be achieved by using the stepless variable speed motor. Due to the welding characteristics of the stainless steel sheet and the welding quality and production efficiency, the design of the stainless steel sheet circumferential seam welding machine is getting higher and higher requirements. Practice has proved that the 81250 stainless steel ring seam welding machine developed in this paper is reasonable and has been successfully applied to more than ten enterprises. 1 welding characteristics of stainless steel sheet The thickness of stainless steel for household use is 0. Heart 0.8, which is a stainless steel sheet. Since the welded stainless steel has a small thermal conductivity and is sensitive to thermal deformation, when welding + rust steel sheets, the injection always prevents the wave deformation weld from burning and eliminates the thermal stress of the weld. The wave deformation is caused by the thermal expansion and contraction caused by the uneven heat dissipation of the contact along the length of the welding. The burnt-through of the seam is flashed, the arc heat is too large, or the weld gap is excessive, or the weld is partially hot. Serious thermal stress caused by welds is more prominent, especially the circumferential seams that are closed at the beginning and the end, which may easily cause joints to be misaligned or overlapped. The above characteristics determine that the design of a ring seam welding machine must be taken, and special process measures can effectively avoid various welding defects. 2BHF250 ring seam welding machine structure 2.1 stainless steel ring seam welding requirements The upper and lower halves of the household stainless steel are made by stamping and drawing. For the ring welding machine, the following requirements 1 can make the two-half workpiece's å»åˆ shape and alignment is good; 21 can adapt to the production of + the same diameter of the workpiece, and can quickly change the fixture, the receiving date 2000314 to ensure higher productivity; 3 can overcome the wrong side or overlap caused by thermal stress deformation of the closed weld. If the two circular diameters of the workpiece are not correct, or the alignment is not accurate, or the deviation caused by the machine tool transmission system is too large, defects such as welding wave deformation or misalignment may occur, resulting in waste. In actual production, the diameter of the upper and lower halves of the circular workpiece cannot be completely achieved. The design point and structure of the reasonable 2.2 stainless steel ring seam welding machine tool meet the structural requirements of the joint of the ring seam, combined with the welding characteristics of the stainless steel sheet, On the basis of the sub-test, the following design points are proposed for the stainless steel ring-slot welding machine. 1 The internal-elastic clamp with multiple small notches is used to make the diameter of the two halves of the workpiece, and the workpiece is shaped and rounded by the elastic clamp. 2; using elastic bronze fixture with good heat dissipation and rigid rigidity to reduce the welding deformation caused by welding thermal stress; 3 using steel external fixture to adjust the degree of expansion and contraction of the inner elastic fixture; 4 using precision machine tools The bearings used increase the accuracy of the transmission. Through the above design scheme, it is possible to effectively solve the two key problems of the circumferential welding of the stainless steel sheet, which is the problem of the weld centering; it is the heat dissipation of the weld seam. Practice has proved that as long as the circumference of the two halves of the workpiece is within the allowable tolerance range, the workpiece can be elastically deformed in the fixture to make their roundness and diameter. In this way, during the welding process, since the workpiece is not clamped and the diameter is allowed to change, the thermal deformation of the closed annular joint is effectively solved. At the same time, the elastic clamp is made of tin bronze material, the thermal conductivity is increased, the heat dissipation is accelerated, and the thermal stress deformation of the weld is effectively solved. Due to the complicated transmission system of the precision machine tool, the processing is difficult and the cost is high. Therefore, the design is based on the general transmission mechanism, and the precision of the transmission part of the clamp is used to achieve the transmission precision, and the radial and axial directions are avoided. The runout deviation ensures the accuracy of the weld alignment. Structure of 61250 circumferential seam welding machine 1. 3 The working process of the machine tool The working process of the ring seam welding machine is to start the electric motor and load the working cylinder. The workpiece is locked and the workpiece is rotated. The arc welding torch is stunned. The arc welding torch is raised and the cylinder is retracted. When using the machine, first place the upper and lower halves of the workpiece into the inner elastic clamp, and press the cylinder to tighten the two halves. After the two halves are centered, the workpiece is locked with a nut and the diameter is made. Then start the motor, after the workpiece rotation speed is even, the arc welding, Na 瞧 瞧 彡噙, 彡噙, Weng Qing cylinder heart retraction motor 1 pull, the company automatically research, only need to manually load and unload 1 piece. The dynamic welding process of the ring seam welder, the work performance is stable. The flatness should pay attention to the quality of the weld. Before the shovel, the dirt on the workpiece must be cleaned. The copper-silver oxide layer and the like are washed away to maintain good heat dissipation and electrical conductivity. 4 Stainless steel ring seam welding machine technical parameters Because the machine's elastic clamp can be replaced, it is possible to weld workpieces of different diameters by simply changing the fixture. Because the 132 series motor is selected, it can be steplessly changed, so it can meet the welding speed required for welding workpieces with different thicknesses and thicknesses. The performance parameters of this machine are. 1 axis, big beating + big cymbal, 25 1; the most end of the end is not beaten, the 5 claws called the two-axis concentricity error is not greater than 1. The working technical parameters are the thickness of the welded workpiece, 1 buckle 21; the welding workpiece yield rate 93. 5 Conclusions The use of fast and automatic alignment of the elastic fixture improves production efficiency and product qualification. It is possible to weld workpieces of various diameters simply by replacing the inner and outer steel clamps. The elastic clamp can be automatically adjusted after wear to ensure accurate alignment of the two halves. The pneumatic clamping of the workpiece ensures uniform clamping force, uniform heat dissipation along the weld direction, and improved weld quality. The placement of the welding torch on the workpiece and the arc recording and welding time are automatically completed according to the design control program. 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