PROCESS PARAMETERS OPTIMISATION FOR SPRING SEAT BASED ON RESPONSE SURFACE METHODOLOGY

Due to the complex structure of spring-seat, six steps were adopted from initial blank to finished product. In this paper, simulation of the stamping process of spring-seat with Dynaform platform was presented and the resulting defects of rupture, wrinkling and spring back were the same as those in a certain factory. Aiming at the wrinkling defects of the helical surface in the forming process, die clearance, blank hold force, and friction coefficient were selected as input variables, wrinkling and thickness uniformity were used as evaluation indexes of stamping quality, and the function relation between the evaluation indices of the stamping quality and variables was obtained through response surface methodology (RSM). After optimisation, the wrinkle index decreased by 31.72 %, and thickness uniformity index decreased by 2.85 %. Stamping validation test was conducted using the optimized stamping parameters. The stamping quality of product was evaluated by gauges. Results showed that spring-seat achieved the quality requirements. The numerical simulation results can provide parameters for manufacturing and reduce the cost in development work.