Design And Analysis Of Special Welding Equipment For Stainless Steel Thin Box

Transmission and transformation equipment stainless steel thin-walled box body is formed by welding six thin-walled stainless steel plates,and to be sealed for life.Among them,welding is the key to affect product quality.It not only to ensure the strength and precision of the box,but also to ensure the air tightness of the box.At present,argon arc welding or gas shielded welding is generally used in China.A few enterprises and some foreign companies use more advanced laser welding methods in mass production.Laser welding efficiency is high,deformation is small,reduce the defects caused by human factors,suitable for large-scale production.However,laser welding puts forward higher requirements on the structural form of the box.the blanking accuracy of stainless steel plate and the design of welding fixture.Therefore,the design of a set of special stainless steel steel thin-walled box of flexible welding equipment to cooperate with the common welding robot in the market for welding.It can not only improve the working efficiency,but also reduce the deformation of thin steel plate in the welding process and improve the reliability of the product,so it has important use value and application prospect.On the basis of consulting a large number of domestic and foreign literature,the function,characteristics,requirements of thin plate welding equipment and the positioning principle and method of welding parts are studied.The structural characteristics of each component panel of the stainless steel box are analyzed,and the welding process requirements and the technical requirements for special welding equipment are determined.The processing technology and process route were determined,and the spot welding deformation of the stainless steel thin-walled box was preanalyzed by finite element method.The results show that the deformation is mainly concentrated around the solder joint and at the opening of the panel,and the deformation of the panel during spot welding is about 2-3mm.The full welding process was determined,and the full welding deformation under six different welding sequence plans was analyzed by numerical simulation method,and the welding deformation under six different plans was obtained.The results show that the order deformation of the symmetrical welding of the whole box is minimum when the long weld is welded first and then the short weld is welded.According to the numerical simulation results of welding deformation analysis and product structure characteristics,the welding sequence of the stainless steel thin-walled box was determined.Based on the analysis of welding deformation and welding process,a set of special flexible welding equipment for stainless steel thin-walled box was designed.The tooling mainly includes positioning components,clamping mechanism,hydraulic lifting platform and automatic turnover mechanism.The clamping force is also analyzed and calculated,and the type of sucker,hydraulic cylinder and motor is selected.The device can fix the six box panels in a single clamping,and will not move during the welding process.After the spot welding of the box,it can also automatically turn over to complete the full welding operation,which reduces the welding deformation and assembly error,and ensures the air tightness and strength requirements of the stainless steel thin-walled box.The performance of the designed welding equipment was analyzed from the aspects of positioning error,stability and deformation,etc.,and the results showed that:the maximum error of the welding seam formed by overlapping the upper and lower four panels was 0.151mm,and the maximum error of the welding seam formed by overlapping the left and right panels with the other four panels was 0.401mm,which was within the range of 0.5mm required by welding.The mechanical analysis of the welding equipment under the clamping state of spot welding shows that the maximum stress is 22.16MPa and the maximum deformation is only 0.14807mm,which can meet the requirements of the strength and stability of the equipment in the process of spot welding.The dynamic analysis of the automatic turnover mechanism of the stainless steel thin-walled box body in the process of full welding shows that the stress is mainly concentrated at the key joints of the left and right ends,and the further the distance from the center line of the rotating spindle,the smaller the stress variable will be.Seen from the whole rotation process,the maximum stress appears at the position of 180 degrees,but the overall change is gentle.This paper analyzes the structural characteristics of the stainless steel thin-walled box and designs a special welding equipment based on the numerical results of welding deformation.It can not only meet the requirements of welding quality and error,but also improve the work efficiency,which has certain reference value and practical application significance.