What are the optimization design methods commonly used to analyze automotive stamping parts?

2023-07-04 08:59:50

Automobile stamping parts should have a good optimization design method, so stamping manufacturers regard stamping optimization design as an important way to reduce the cost of automobile manufacturing, which can make the appearance of automobiles beautiful. The reduction of air resistance can also reduce the number of stamping parts and solder joints, which can effectively reduce costs.

empirical method. This method is mainly based on some empirical calculation formulas, so its application range is affected, and it is mainly applied to expandable stamping parts with relatively simple shapes (such as rotating parts, bending parts, or stamping parts composed of these simple shapes). In general, the method of developing the free-form surface of plate parts from experience is a makeshift method, and its accuracy is affected by many factors such as the richness of user experience, the empirical formula used and the selection of specific process parameters. Its accuracy needs to be further improved.

The basic assumptions of the slip line method are: the thickness of the sheet flange is constant, and it is in a plane strain state, the material is isotropic, no hardening, and the influence of friction force distribution on plastic flow is not considered.

From the description of the slip line method, it is shown that only stamping parts with relatively simple shapes can establish the corresponding slip line field. And only under extremely simple boundary conditions can the mathematical expression of the slip line be given from the solution of the characteristic square. In general, it is necessary to use the numerical integration of the characteristic equation, according to the given boundary conditions, point by point recursion, to obtain the approximate slip line field, this method is to transform the differential equation of the characteristic line into a finite difference relation, and use The characteristics of the slip line are used as the basis. Therefore, the sliding line method is difficult to popularize and apply in actual production due to the complicated mathematical operation.

geometric mapping. They believe that the mapping from the workpiece to the blank can be realized according to certain assumptions without considering the boundary conditions such as deformation force, stress-strain relationship and boundary friction. First, the wooden model is meshed, and the position coordinates of the nodes are obtained by using a coordinate measuring instrument. Or directly divide the grid in the computer from the CAD model. Assuming that the thickness of the workpiece is constant during the forming process, and the area of the grid before and after deformation is constant, the three-dimensional spatial grid is mapped to the two-dimensional plane, so that the initial blank shape and the stress distribution of the workpiece can be inferred.

simulation method. The simulation method is based on the similarity of mathematical descriptions of many physical problems under certain assumptions, through mathematical similarity theory, and using models composed of other physical media to simulate the metal flow of sheet metal flanges. Laplace and Poission equations are widely used in sheet metal forming.