Method for simulating defection of surface coarsing of automotive plates

Abstract

A method for simulating nap defect on plate surface of automobile includes using single driving inverted presser as testing presser, using hollow based and cone shaped box mould as punching concave model, producing edge pressing plate and convex model cavity simultaneously to ensure their concentricity and to ensure they are in the same size, setting mould gap between convex model and concave model to be 1.5®L ,embedding drawing concave rib and convex rib on pressing plate and operation surface of convex mode to ensure absolute smooth of embedded binding site then carrying out nap-testing .

Description

technical field [0001] The invention relates to a method in the technical field of vehicle engineering, in particular to a method for simulating roughening defects on the surface of automobile sheet metal. Background technique [0002] In cold-rolled steel sheet stamping, especially sheet deep drawing, when the sheet is in sliding motion, due to the forced contact between the sheet and the working surface of the die, adhesive wear may occur, and the formed part will be severely damaged. , that is, the surface damage of the stamping parts - the phenomenon of napping. In production, by reducing napping defects, the surface quality and yield of products can be improved. Therefore, it is very important for automakers and automotive sheet suppliers to study the phenomenon of picking and the measures to prevent it. In the stamping process of cold-rolled steel sheets, the phenomenon of napping is related to many factors: the material (composition and structure), mechanical proper...

AI Technical Summary

Problems solved by technology

At present, relevant researches are mainly focused on sheet bending forming, and the forming method adopted is basically U-shaped part bending. Sheet metal stretching forming, the feature forming mode is single, and can only simulate the forming of the sheet metal at the larger straight side of the cover part drawing die

The disadvantage of this method is that it is impossible to obtain the napping characteristics of the sheet metal under more stress states, and the deformation method is single, which basically can only reflect the napping characteristics of the sheet metal when the steel plate is simply bent and deformed.

[0003] Found through document retrieval to prior art, the people such as D.M.Fabijanic of Australia published a paper "Improving the galling resistance of automotive stamping tools" ("Improving the automotive stamping tools" in the periodical "Metal Forming" ("Metal Forming") No. 9, 2000 The anti-picking performance of dies"), this paper studies the anti-wear performance of stamping dies for automobile panels by bending forming method, they all realized the simulation of napping in the experiment, but they all have obvious limitations, mainly the panel Material napping only occurs in the straight edge part of bending forming, but for automobile panels with various geometric shapes, the forming mode is deep drawing deformation, that is, except for the bending deformation in the larger straight edge part, other parts are deep drawing deformation , belongs to the sheet metal compression forming, and the picking defect at the corner of the mold is more common than the picking at the straight edge, so the bending deformation of the U-shaped part is used to simulate the wear of the mold (or the resistance of the sheet to pick) for the study The napping characteristics of automobile sheets have great limitations, which cannot fully meet the needs of studying the influence of various factors on the napping behavior and establishing a scientific evaluation of napping defects

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