Method for building accurate molded surface of automobile covering part drawing mold

Abstract

The invention discloses a method for building an accurate molded surface of an automobile covering part drawing mold. According to the method, the distribution condition of thicknesses of different areas of a formed part is obtained through stamping simulation calculation; according to thickness information of each node, a convex-concave mold tool grid is adjusted to build an accurate molded surface grid model suitable for thickness distribution of the part by means of the methods of grid mapping, shape function interpolation, node deviation and the like. On the basis of the adjusted tool grid, according to the offset of the nodes of the grid, corresponding offsetting is carried out on corresponding curved surface pieces of the molded surface of the mold and control vertexes of cutting lines of the molded surface, so that curved surfaces automatically deform along with the changes of the grid model, and accordingly the accurate molded surface, suitable for changes of the thicknesses of the part, of the mold is built. According to the method, the matching rate of the molded surface of the mold is improved in terms of design of the molded surface of the mold. Particularly, under the condition that the thinning ratio is large after plastic deformation of a plate occurs, the matching rate of the molded surface of the mold can be obviously improved, the manufacturing efficiency of the mold is improved and manufacturing cost of the mold is reduced.

Description

Technical field [0001] The invention relates to a method for constructing a precise die surface of a drawing die of an automobile cover. Background technique [0002] With the development of CAE (ComputerAided Engineering) technology, and successfully applied to the numerical simulation of sheet metal forming, CAE-based numerical simulation analysis provides a powerful tool for mold design and development and plays an increasingly important role. When designing the drawing die for automobile covering parts, in order to make the parts have the same shape as the design mold surface after forming, the molding surface of the punch and the concave mold must be consistent with the shape of the part, so that the shape of the part after stamping and clamping It can be obtained depending on the shape of the mold surface. Since there will be thinning or thickening in the sheet metal forming process, and this change is not the same in different areas of the part, it is necessary to repeate...

AI Technical Summary

Problems solved by technology

Since there will be thinning or thickening during the sheet metal forming process, and this change is different in different areas of the part, it is necessary to repeatedly correct the mold surface according to the actual thickness change of the drawn formed part until the convex and concave The surface of the model can be completely bonded to the surface of the part after it is molded. This degree of bonding is called "combination rate" or "combination rate" in the drawing forming process, and it is generally required to reach about 80%. This process requires the fitter to repeatedly debug and trim the mold surface, which takes a long time

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