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Hot stamping forming process based on Q&P one-step method

A technology of hot stamping forming and hot stamping, which is applied in the field of hot stamping forming technology based on Q&P one-step method, which can solve the problems of low strength and plasticity, poor plasticity (poor elongation), and achieve improved elongation and impact resistance. , Good effect of comprehensive impact resistance mechanical properties

Inactive Publication Date: 2013-11-20
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the parts produced by the existing hot stamping process have high strength, their plasticity (elongation) is poor, generally around 5%.
As a result, the strength-plastic product (the product of strength and elongation) of the parts is not high, and there is still a lot of room for improvement in the impact resistance of ultra-high-strength steel parts
However, there is no report on the introduction of Q&P into the hot stamping process of ultra-high-strength steel.

Method used

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  • Hot stamping forming process based on Q&P one-step method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The material is the hot stamping steel B1500HS produced by Baosteel as an example. One-step hot stamping process based on Q&P, such as figure 1 shown, including the following steps:

[0020] 1) Cutting: cutting B1500HS sheets according to hot stamping parts;

[0021] 2) Mold preheating: heat the mold with heating plate to 250°C;

[0022] 3) Heating: put the sheet into the heating furnace, vacuumize, and heat the sheet to

[0023] 920°C, keep warm for 5 minutes to make the sheet austenitized evenly;

[0024] 4) Hot stamping forming: quickly move the heated sheet to the hot stamping die, use a 100T hydraulic press for stamping and quenching, keep the mold closed, carry out carbon distribution and heat preservation at 250°C for 40s, and perform Q&P one-step processing;

[0025] 5) Final quenching: open the mold, take out the hot stamping parts after carbon distribution and heat preservation, and quickly put them into water to quench to room temperature;

[0026] 6) De...

Embodiment 2

[0028] The hot stamping forming process based on Q&P one-step method is an integrated process of Q&P heat treatment process and hot stamping process, which specifically includes the following steps:

[0029] (1) Cutting: cutting the sheet according to the size of the hot stamping part;

[0030] (2) Mold preheating: heat the mold with the heating plate to 230°C;

[0031] (3) Heating: Put the sheet into the heating furnace, vacuumize, heat the sheet to 900°C at a heating rate of 15°C / s, and keep it warm for 6 minutes to make the sheet evenly austenitized;

[0032] (4) Hot stamping forming and in-mold quenching: Quickly move the heated sheet to the preheated hot stamping die for stamping and quenching. Since the temperature of the mold is much lower than the temperature of the sheet, it is completed while forming. in-mold quenching process;

[0033] (5) Carbon distribution: keep the mold closed and keep warm at 230°C for 180s;

[0034] (6) Final quenching: the hot stamping par...

Embodiment 3

[0037] The hot stamping forming process based on Q&P one-step method is an integrated process of Q&P heat treatment process and hot stamping process, which specifically includes the following steps:

[0038] (1) Cutting: cutting the sheet according to the size of the hot stamping part;

[0039] (2) Mold preheating: heat the mold with heating plate to 410°C;

[0040] (3) Heating: Put the sheet into the heating furnace, vacuumize, heat the sheet to 950°C at a heating rate of 16°C / s, and keep it warm for 3 minutes to make the sheet evenly austenitized;

[0041] (4) Hot stamping forming and in-mold quenching: Quickly move the heated sheet to the preheated hot stamping die for stamping and quenching. Since the temperature of the mold is much lower than the temperature of the sheet, it is completed while forming. in-mold quenching process;

[0042] (5) Carbon distribution: keep the mold closed and keep warm at 410°C for 10s;

[0043] (6) Final quenching: the hot stamping parts af...

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Abstract

The invention relates to a hot stamping forming process based on a Q&P one-step method. The process is a process which integrates a Q&P hot processing process and hot stamping process and specifically includes the following steps of cutting a sheet according to the size of a hot stamping part, heating a die with a heating plate to a temperature ranging from 230 DEG C to 410 DEG C, placing the sheet into a heating furnace, conducting vacuum pumping, heating the sheet to a temperature ranging from 850 DEG C to 950 DEG C at a heating speed not lower than 15 DEG C per second, conducting heat preservation for 3min to 6min so that the sheet can be even in an austenitized mode, quickly moving the heated sheet to a preheated hot stamping die to be stamped, formed and quenched, enabling the die to be kept in a closed state, conduct heat preservation for 10s to 180s, quickly placing the hot stamping part into water and enabling the hot stamping part to be quenched to the room temperature after carbon distribution heat preservation, conducting de-scaling, and removing the oxide skin of the formed part through shot blasting or acid dipping. Compared with the prior art, the hot stamping forming process based on the Q&P one-step method can ensure that a finally manufactured part has high strength and has good plasticity (ductility) at the same time, and therefore the shock resistance of the manufactured part is improved.

Description

technical field [0001] The invention belongs to the field of hot stamping processing of sheet metal, in particular to a hot stamping forming process based on a Q&P one-step method. Background technique [0002] At present, the application of ultra-high-strength steel has become one of the mainstream development trends in automobile and other manufacturing fields, and hot stamping is an important way to realize ultra-high-strength steel parts. The process flow adopted by the existing hot stamping forming technology is as follows: select special hot stamping materials → blanking → heating and heat preservation (full austenitization of sheet metal) → quickly move to the mold → quenching and cooling while completing forming. Finally, an ultra-high-strength stamping part (martensite in structure, with a strength of about 1500MPa or even higher) is obtained. [0003] Although the parts produced by the existing hot stamping process have high strength, their plasticity (elongation)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D22/02C21D8/02
Inventor 韩先洪崔振山辛沛森
Owner SHANGHAI JIAO TONG UNIV
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