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Method for locally softening automotive thermal forming part

A local softening, thermoforming technology, applied in furnace type, heat treatment furnace, heat treatment equipment, etc., to achieve the effect of optimizing performance

Active Publication Date: 2016-11-09
COSMA AUTOMOTIVE (CHONGQING) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structure of traditional hot-formed parts is mainly quenched martensite, and only one strength range can be realized on the same part.

Method used

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  • Method for locally softening automotive thermal forming part
  • Method for locally softening automotive thermal forming part
  • Method for locally softening automotive thermal forming part

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Such as figure 1 As shown, the local softening method of the automobile B-pillar comprises the following steps:

[0023] 1) Heating: put the B-pillar material into the heating furnace for zone heating, only one part of the material needs to be softened, this part is soft zone 2, and the rest of the material is hard zone 1, and hard zone 1 is also one. The temperature of the hard zone of the blank is heated to any value or range of values ​​in 860-960° C., and the blank is kept at this temperature for 3-5 minutes until the hard zone is completely austenitic. Heating the soft area of ​​the web to any value or range of values ​​in the range of 500-650°C, and maintaining this temperature, a transition area 3 is naturally formed between the hard area 1 and the soft area 2 of the web;

[0024] 2) Molding cooling: take the blank out of the heating furnace, and then stamp it on the press through the mold clamping. When the mold is clamping, the circulating cooling water in the...

Embodiment 2

[0026] Such as figure 2 As shown, the local softening method of the automobile B-pillar comprises the following steps:

[0027] 1) Heating: put the B-pillar material into the heating furnace for zone heating, only one part of the material needs to be softened, this part is soft zone 2, the rest of the material is hard zone 1, and hard zone 1 is two, Heat the temperature in the high temperature zone of the blank to 910-960°C, keep the temperature for 3 minutes until the hard zone is completely austenitized, heat the soft zone of the blank to 700-860°C, and keep this temperature range. A transition zone 3 is naturally formed between the hard zone 1 and the soft zone 2;

[0028] 2) Molding cooling: Take the tablet out of the heating furnace, and then stamp it on the press through the mold clamping. When the mold is closed, the circulating cooling water in the mold is quickly cooled, so that all the hard areas 1 of the tablet form high-strength quenching Martensite, the soft ar...

Embodiment 3

[0030] Such as image 3 As shown, the local softening method of the integral door knocker includes the following steps:

[0031] 1) Heating: put the overall door ring piece sheet into the heating furnace for heating, heat the temperature in the furnace to any value or value range in the range of 860-960°C, keep the sheet at this temperature for 3-5 minutes, so that The blank is completely austenitized;

[0032] 2) Molding and cooling: take the tablet out of the heating furnace, and then press the mold on the press for 10-15 seconds. When closing the mold, the part of the blank that needs to be softened is the soft zone 2, there are two soft zones 2, the rest of the blank is the hard zone 1, and there are three hard zones 1. The mold insert corresponding to the soft zone 2 of the blank has a built-in heating system, and the temperature is maintained at 500°C-550°C, while the mold insert corresponding to the hard zone 1 of the blank is circulated with cooling water to achieve ...

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Abstract

The invention discloses a method for locally softening an automotive thermal forming part. The method can be realized through the following manners: 1, controlling the temperature of sheet matal at different areas at the sheet matal heating phase of thermal forming technology; 2, controlling the temperature of inserts at different areas of a die at the die assembling phase of the thermal forming technology; 3, controlling the cooling rate of sheet matal at different areas at the die assembling phase of the thermal forming technology; and 4, after the thermal forming technology is finished, locally heating the thermal forming part for the second time. With adoption of the method, one thermal forming part has different mechanical properties at different areas, and the performance of the part in a vehicle crash test is optimized. The high-strength part of the performance-variable thermal forming part is mainly quenched martensite, and the tensile strength is equal to or greater than 1300 Mpa; and the low-strength part of the performance-variable thermal forming part is formed by one or combination of ferrite, pearlite, bainite and tempered martensite, and the tensile strength is equal to or less than 1000 Mpa.

Description

technical field [0001] The invention relates to a local softening method for thermoformed parts of an automobile, so as to realize that the same thermoformed part has different mechanical properties in different regions, and optimize the performance of the parts in the collision test of the whole vehicle. Background technique [0002] In order to improve the crash performance of the whole vehicle, thermoformed parts are more and more widely used on the car body. However, the structure of traditional thermoformed parts is mainly quenched martensite, and only one strength range can be realized on the same part. Using local softening process for thermoformed parts and customizing local material structure can realize different strength ranges of the same part in different areas, which is more conducive to optimizing the crash performance of the whole vehicle. Contents of the invention [0003] In view of the above-mentioned defects in the prior art, the technical problem to b...

Claims

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Application Information

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IPC IPC(8): C21D9/00C21D1/18B21D22/00
CPCC21D1/18C21D9/0068B21D22/00C21D2211/009C21D2211/008C21D2221/00C21D2211/005C21D2211/002B21D22/208B21D53/88B21D35/005
Inventor 甘燕华
Owner COSMA AUTOMOTIVE (CHONGQING) CO LTD
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