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Hot Stamping Process with Integrated Staged Cooling and Carbon Distribution Process

A hot stamping forming and segmented cooling technology, applied in forming tools, manufacturing tools, metal processing equipment, etc., can solve the problem that the cooling rate cannot reach the critical cooling rate, the cooling rate in the in-mold quenching stage is not enough, and the forming quality of complex moldings Not easy to break and wrinkle, good comprehensive mechanical properties, and improved elongation

Active Publication Date: 2016-06-15
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The hot stamping forming process based on the Q&P one-step method increases the carbon distribution process, so the plasticity of the hot stamping formed parts produced by this process is better than that of the general hot stamping forming products; however, in practical applications, due to the The cooling rate in the internal quenching stage is not enough, that is, the cooling rate in the in-die quenching stage of the Q&P one-step hot stamping forming process cannot reach the critical cooling rate of the martensitic transformation of the material, so the hot stamping formed parts produced by this process The strength is lower than that of hot stamping parts produced by general hot stamping forming process
Moreover, the hot stamping forming process based on the Q&P one-step method is adopted. In the steps of hot stamping forming and in-mold quenching, the sheet material heated to 850°C to 950°C is directly subjected to hot stamping forming operation. This stamping temperature range is generally not The optimum forming temperature of the material, the forming quality of complex forming parts is not high

Method used

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  • Hot Stamping Process with Integrated Staged Cooling and Carbon Distribution Process

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Experimental program
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Effect test

Embodiment 1

[0031] Such as figure 1 As shown, the hot stamping forming process of the integrated segmental cooling and carbon distribution process in this embodiment is an integrated process of segmental cooling process, Q&P heat treatment process and hot stamping process, including the following steps:

[0032] 1) Blanking: Cut the B1500HS sheet according to the size of the hot stamping part;

[0033] 2) Mold preheating: the mold with the heating module is heated to 350° C., and 350° C. is the PT temperature of this embodiment;

[0034] 3) Plate heating: Put the plate into the heating furnace, vacuumize, heat the plate to 920°C at a heating rate of 20°C / s, and keep it warm for 5 minutes to make the austenitization of the plate even;

[0035] 4) Transfer and cooling: Transfer the heated sheet to the mold. During the transfer process, use compressed air to reduce the sheet to the stamping temperature. The stamping temperature of the sheet used in this embodiment is 600°C. The cooling rat...

Embodiment 2

[0047] Such as figure 1 As shown, the hot stamping forming process of the integrated segmental cooling and carbon distribution process in this embodiment is an integrated process of segmental cooling process, Q&P heat treatment process and hot stamping process, including the following steps:

[0048] 1) Blanking: cutting the sheet according to the size of the hot stamping part;

[0049] 2) Mold preheating: heat the mold with heating module to 300°C;

[0050] 3) Plate heating: Put the plate into the heating furnace, vacuumize, heat the plate to 900°C at a heating rate of 15°C / s, and keep it warm for 6 minutes to make the austenitization of the plate even;

[0051] 4) Transfer and cooling: Transfer the heated sheet to the mold. During the transfer process, use water vapor mixed spray to cool the sheet to 650°C, and the cooling rate of the sheet to 650°C is 100°C / s ;

[0052] 5) Hot stamping forming and in-mold quenching: stamping and forming quenching on the press, because th...

Embodiment 3

[0058] The hot stamping forming process integrating segmental cooling and carbon distribution process in this embodiment is an integrated process of segmental cooling process, Q&P heat treatment process and hot stamping process, including the following steps:

[0059] 1) Blanking: cutting the sheet according to the size of the hot stamping part;

[0060] 2) Mold preheating: heat the mold with heating module to 200°C;

[0061] 3) Plate heating: Put the plate into the heating furnace, vacuumize, heat the plate to 950°C at a heating rate of 15°C / s, and keep it warm for 3 minutes to make the austenitization of the plate even;

[0062] 4) Transfer and cooling: Transfer the heated sheet to the mold. During the transfer process, use liquid nitrogen to cool the sheet to 800°C, and the cooling rate of the sheet to 800°C is 120°C / s;

[0063] 5) Hot stamping forming and in-mold quenching: stamping and forming quenching on the press, because the mold temperature is much lower than the sh...

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Abstract

The invention provides hot stamping forming process used in the integrated segmented cooling and carbon distribution process and relates to the field of metal plate hot stamping machining. Transferring and cooling steps are added in the process, heated plates are moved out of a heating furnace in the steps, in the process of transferring the plates to dies, a cooling medium is adopted to reduce the temperature of the plates to be at stamping temperature, and the temperature reducing speed from the temperature of the plates to the stamping temperature is not lower than 80 DEG C / s. The strength of hot-stamping formed parts produced through segmented cooling is basically equal to the strength of existing hot-stamping formed parts produced by means of the hot stamping forming process adopting a cooling water channel, the elongation rate is improved by 20%-50%, it can be ensured that the plates have best forming performance during internal stamping of the dies, and produced hot-stamping formed parts are not likely to crack or crinkle or be subjected to other quality problems.

Description

technical field [0001] The invention relates to the field of hot stamping processing of sheet metal, in particular to a hot stamping process integrating segmental cooling and carbon distribution processes. 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 poor deformation ability at room temperature, and it is very difficult to adopt traditional cold stamping. Therefore, hot stamping came into being. It has become one of the most important production methods for ultra-high-strength steel parts. The general technological process adopted by the existing hot stamping forming technology is: blanking→heating and heat preservation→quick transfer to the mold→stamping in the mold and completing pressure quenching→complete descaling and other follow-up treatm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D22/02B21D37/16
CPCB21D22/02B21D22/022B21D37/16
Inventor 韩先洪陈思思钟瑶瑶
Owner SHANGHAI JIAOTONG UNIV
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