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Method for forming variable-strength hot stamping parts by ultrahigh-strength steel

An ultra-high-strength steel and hot stamping technology, applied in the field of hot stamping, can solve problems such as inability to form variable-strength hot stamping parts, and achieve the effect of simplifying mold design and forming process, and improving accuracy and stability.

Inactive Publication Date: 2012-07-11
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a method for forming variable-strength ultra-high-strength steel hot stamping parts to effectively solve the technical problem that the traditional hot forming process cannot form variable-strength hot stamping parts

Method used

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  • Method for forming variable-strength hot stamping parts by ultrahigh-strength steel
  • Method for forming variable-strength hot stamping parts by ultrahigh-strength steel
  • Method for forming variable-strength hot stamping parts by ultrahigh-strength steel

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Embodiment Construction

[0010] The following takes the B-pillar parts of the car as an example, combined with the attached Figure 1-4 Specific embodiments of the present invention will be described.

[0011] The convex and concave dies used for forming and cooling the sheet adopt a segmented structure, and each module has an independent cooling system with water inlet and outlet respectively. The segmented structure not only facilitates the processing of cooling pipes and improves cooling efficiency, but also can individually design cooling pipes inside the corresponding convex and concave mold modules according to the strength requirements of different positions of the parts.

[0012] The softened part of the B-pillar is located at a certain distance close to the lower fixed part, such as figure 1 shown. The softening part requires lower strength and higher plasticity, and it can be deformed first when the vehicle body collides, absorbing a large amount of energy. The softening part of the B-pil...

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Abstract

The invention relates to a method for forming variable-strength hot stamping parts by ultrahigh-strength steel, which aims to solve the technical problem of forming variable-strength hot stamping parts with partial softened portions and is realized by changing cooling pipes inside male dies and female dies corresponding to the softened portions. By the method of reducing diameters of the cooling pipelines, increasing distance between the pipelines and increasing the distance from the pipelines to surfaces of the dies, quenching degree of plates is lowered, martensite content of formed parts is reduced, strength of the portions is reduced, and finally the variable-strength hot stamping parts are formed.

Description

Technical field: [0001] The invention provides a forming method of a variable-strength ultra-high-strength steel hot stamping part by changing the design of local cooling pipes in the convex and concave dies of the hot stamping die, and belongs to the field of hot stamping forming. Background technique: [0002] Hot stamping is a new technology specially used for forming ultra-high strength steel plates, which has been widely used in the early 21st century. The principle of hot stamping forming technology is to heat the high-strength boron alloy steel plate with a strength of 500-600MPa at room temperature to 900-950°C, keep it warm for 5-7 minutes to make it completely austenitized, and then send it into the steel plate with a cooling tube inside. The steel plate is cooled and quenched by the surface of the mold at the same time, austenite is transformed into martensite, and phase transformation strengthening occurs, and the strength is greatly improved, which can reach mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D37/16B21D37/10
Inventor 谷诤巍于思彬徐虹李欣吕萌萌孟佳沈永波
Owner JILIN UNIV
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