High-strength steel car outer covering part assembly and manufacturing method thereof

Abstract

The invention discloses a high-strength steel car outer covering part assembly and a manufacturing method thereof. The method comprises the steps that a plate is cut into a needed blank shape, whereinthe plate is made from spring steel or medium manganese steel, and the plate is subjected to cold rolling treatment or cold rolling annealing acid pickling treatment; the blank is placed in heating equipment to be heated to austenitic temperature or above, and heat preservation is carried out; inert gas is introduced into the heating equipment, and the blank is taken out of the heating equipmentwhen the temperature of the blank is reduced to be below 700 DEG C; when the temperature of the blank is higher than the temperature of the point Ms, the blank is subjected to compression moulding; and the blank subjected to compression moulding is subjected to edge covering press fit, tempering and surface treatment. According to the high-strength steel car outer covering part assembly and the manufacturing method thereof, the high-strength spring steel or medium manganese steel is adopted as the car outer covering part assembly, the tensile strength ranges from 1,000 Mpa to 2,300 Mpa, the yield strength ranges from 1,000 Mpa to 1,500 Mpa, and the yield ratio ranges from 0.7 to 0.9; and the anti-dent performance is excellent, and meanwhile the thickness of the outer covering part can be reduced by 20% to 30%.

Description

technical field [0001] The invention relates to the field of hot press forming, in particular to a high-strength steel automobile outer cover assembly and a manufacturing method 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 cover ...

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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