High-strength steel automobile panel assembly and its manufacturing method and device

Abstract

The invention discloses a high-strength steel automobile covering piece assembly and a manufacturing method and device thereof. The manufacturing method comprises the steps that a plate is blanked into a required blank shape, and the plate is made of martensitic steel and is subjected to cold rolling treatment or cold-rolling annealing acid-pickling treatment; the blank is placed in heating equipment to be heated to the austenitic temperature or above; inert gas is introduced into the heating equipment, and the blank is taken out from the heating equipment when the blank is cooled to 700 DEG Cor below; a blank holder is heated to the temperature within the Ms temperature to the Acl temperature; when the temperature of the blank is higher than the Ms point temperature, the blank is pressedand formed; and the pressed blank is subjected to edge-covering pressing fit, tempering and surface treatment. The automobile covering piece assembly manufactured through the manufacturing method hasquite high tensile strength and yield strength and excellent indentation resistance, steel materials are saved, and meanwhile, by adopting a method of heating the blank holder, the risk of rupture ofthe blank in the heat stamping process of an external covering piece is effectively reduced.

Description

technical field [0001] The invention relates to the field of hot press forming, in particular to a high-strength steel automobile panel assembly and a manufacturing method and device thereof. Background technique [0002] The dent resistance of automobile bodies, especially the dent resistance of outer covering parts, has become an important reference for users to choose cars. When the body panel is subjected to external loads, the ability to resist sag bending and local dent deformation and maintain shape is called dent resistance, which is an important index and characteristic for evaluating and reflecting the surface quality and performance of the panel. Body panels are large in size, low in curvature, and have certain pre-deformation, and are often subjected to external loads during use. Such as artificial touch and press, static load, vibration and collision during movement, etc. These loads often cause concave deflection or even permanent concave deformation of the c...

AI Technical Summary

Problems solved by technology

However, the higher the strength of the material, the lower its stamping performance, and various forming defects are prominent. Not only does it require a large forming force, but also the rebound is serious, and it is difficult to ensure the dimensional accuracy of the workpiece. This limits the use of high-strength steel in automotive outer panels. application on

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