| The automobile electronic control power brake system shell is a kind of sheet forming cover,which is the structure of the gear transmission part of the bearing system,plays the role of protecting and fixing the internal structure,and is of great significance to the development of the internal system structure of the automobile.The shell is made of stamping die,and its quality will directly affect the smooth operation of the internal structure.Not only the mechanical properties of sheet metal should be considered,but also the forming process parameters and the design of die structure are very important.In this paper,the forming process of the shell is studied,and finally,according to the method and theory of the paper,the samples are made up of the standard.The overall appearance of the shell is very irregular,and the equivalent of large aspect ratio cylindrical parts.The main processes involved are: drawing,punching and flanging.Based on the mechanical theory of sheet metal stamping and the finite element numerical simulation theory,the stamping process parameters and the transition shape of the workpiece which affect the forming quality are analyzed and optimized.The forming process of the upper shell is numerically simulated by nonlinear finite element software dynaform.Firstly,the structural characteristics of the shell are summarized,and the technical difficulties are put forward according to their characteristics,and a reasonable technological process is planned according to the principle of solving the technological difficulties.Then the model of the shell is established by using the tool software,and the blank is calculated back.According to the process flow of planning and design,the dynaform software is used to simulate the drawing forming of each pass of the shell,and the thickness distribution map and the forming limit map are obtained to predict the cloud map.According to the inherent attribute index of the shell in the diagram,the stamping quality of the workpiece is evaluated,and the corresponding experimental results are predicted and evaluated to a certain extent.According to the punching and flanging process,the size and blanking force of the flanging prefabricated hole should be calculated.According to the simulation scheme and calculation results,the die which meets the actual production conditions and the precision requirements of the workpiece is designed.Finally,the shell samples that meet the requirements in size and precision are obtained by using the mould that meets the requirements.This paper not only carries on the reasonable process flow design to the complex irregular shape drawing piece structure difficulty,but also carries on the breakthrough innovation to the multi-pass drawing process die structure,provides the reference case to the similar type workpiece actual production. |
