Integrated process of hot-stamping and die trimming

A technology of hot stamping forming and hot stamping, which is applied in the direction of forming tools, heat treatment furnaces, manufacturing tools, etc., can solve the problem of high cost per piece, and achieve the effects of simple design, reduced trimming resistance, and low energy consumption

CN107597962AInactive Publication Date: 2018-01-19SHANGHAI JIAO TONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-01-19
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to an integrated process of hot stamping and die trimming. The integrated process comprises the steps of blanking, trimming die preheating, heating, primary transferring, hot stamping shaping and in-die primary quenching, secondary transferring, carbon distribution and die trimming, die opening and secondary quenching, and post treatment and the like. According to the integrated process of hot stamping and die trimming, compared with the prior art, super high strength steel products with high strength and good plasticity can be obtained, die trimming is simultaneously conducted in the carbon distribution stage, so that the carbon distribution time can be utilized more effective so as to speed up production takt of the Q&P hot stamping process; the deformation resistance of sheet metal in the carbon distribution stage is low, so that abrasion of the trimming die can be significantly reduced; and the die trimming can replace an existing laser trimming method for ultra high strength steel, and the production cycle is substantially shortened.
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Description

technical field

[0001] The invention belongs to the field of sheet metal hot stamping forming processing, and in particular relates to an integrated process of hot stamping and mold trimming. Background technique

[0002] For the purpose of weight reduction and environmental protection, the application of ultra-high-strength steel has become one of the mainstream development trends in automobiles and other manufacturing fields. However, ultra-high-strength steel has high resistance and poor deformation ability at room temperature, and it is very difficult to adopt traditional cold stamping. Hot stamping came into being and has become one of the main production methods for ultra-high-strength steel parts. The general technological process adopted by the existing hot stamping forming technology is: blanking → heating above the austenitizing temperature and holding it for 3 to 6 minutes → quickly transferring to the mold → stamping in the mold and completing pressure quenching ...

Examples

Embodiment 1

[0033] The material is the hot stamping steel B1500HS produced by Baosteel as an example. Based on an integrated process of ultra-high-strength steel hot stamping and die trimming, such as figure 1 shown, including the following steps:

[0034] (1) Blanking: cutting B1500HS sheets according to hot stamping parts;

[0035] (2) Mold preheating: heat the trimming mold with a heating plate to 350°C;

[0036] (3) Heating: Put the sheet into a heating furnace, vacuumize, heat the sheet to 920°C at a heating rate of 20°C / s, and keep it warm for 5 minutes to make the sheet evenly austenitized;

[0037] (4) Primary transfer: remove the heated sheet from the heating furnace and transfer it to the hot stamping mold;

[0038] (5) Hot stamping forming and primary quenching in the mold: Use a 100-ton (T) hydraulic press for stamping forming quenching, keep the mold closed, control the downward speed of the press, and complete stamping forming quenching until the temperature of the part d...

Embodiment 2

[0044] Based on an integrated process of ultra-high-strength steel hot stamping and die trimming, the process is an integrated process of hot stamping forming process, Q&P heat treatment process and die trimming process, which specifically includes the following steps:

[0045] (1) Blanking: cutting 27SiMn sheet according to the size of hot stamping parts;

[0046] (2) Mold preheating: heat the trimming mold with a heating plate to 400°C;

[0047](3) Heating: Put the sheet into the heating furnace, vacuumize, heat the sheet to 900°C at a heating rate of 5°C / s, and keep it warm for 6 minutes to make the sheet evenly austenitized;

[0048] (4) Primary transfer: remove the heated sheet from the heating furnace and transfer it to the hot stamping mold;

[0049] (5) Hot stamping and quenching in the mold: Use a 200T servo press for hot stamping quenching, keep the mold closed, control the downward speed of the press, and complete stamping quenching until the temperature of the par...

Embodiment 3

[0055] An integrated process of hot stamping and mold trimming, the process of which is as follows figure 1 As shown, the following steps are taken:

[0056] (1) Blanking: cutting the sheet according to the size of the hot stamping part;

[0057] (2) Preheating of the trimming mold: heating the trimming mold to 200°C and keeping it warm;

[0058] (3) Heating: put the sheet into a vacuum heating furnace for heating, the heating speed is not lower than 5°C / s, heat the sheet to 900°C, and keep it warm for 6 minutes to make the austenitization of the sheet even;

[0059] (4) Primary transfer: move the heated sheet out of the vacuum heating furnace and transfer it to the hot stamping mold;

[0060] (5) Hot stamping forming and one-time quenching in the mold: start the press, control the downward speed of the press, and complete stamping quenching until the temperature of the part drops to 200°C;

[0061] (6) Secondary transfer: move the hot stamping parts out of the hot stamping...