In order to meet the clamping needs in the welding process of cylindrical workpieces with differ-ent diameters,lengths and thicknesses,and reduce the quality of the fixtures,through the structural de-sign and force analysis of the self-centering fixture,the finite element model of the fixture structure was established,and the static characteristics of the fixture were obtained by finite element analysis.On this basis,the design method of size optimization was used to optimize the design aiming at reducing the mass,and finally the lightweight design of the V-shaped fixture was completed.Comparing the optimized V-shaped clamp with that before optimization,the results show that when the maximum deformation of the clamp is less than 0.5 mm and the maximum stress value is less than 156 MPa,the mass of a single V-shaped block was reduced from the original design of 33.854 kg to14.954 kg,reduced by 55.83％.Through the size optimization design,the quality of the fixture was reduced and the working performance of the fix-ture was improved.The research results can provide a reference for the related research on the fixture of the straight seam welding equipment.
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