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Thermal treatment process for mould used for automobile metal bumper manufacturing

A bumper, preheating treatment technology, applied in metal material coating process, coating, solid diffusion coating and other directions, can solve high temperature resistance, dimensional stability and comprehensive strength and hardness difference, difficult to meet the actual production, use Insufficient life and other problems, to achieve the effects of excellent stability, improved strength and toughness, improved hardness and wear resistance

Active Publication Date: 2017-07-14
HEFEI DINGXIN MOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing molds are prone to problems such as cracking, wrinkling, and poor flatness during injection molding, and the scrap rate is high, and the mold can withstand low abrasiveness, high temperature resistance, dimensional stability, and comprehensive strength. Hardness is poor, and the service life is serious Insufficient, it is difficult to meet the needs of actual production, and the cost is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A mold heat treatment process for making an automobile metal bumper is characterized in that it comprises the following steps:

[0020] 1) Carry out gradient preheating treatment on the mold under the condition of 500-900°C, specifically, the temperature is gradually reduced from high to low at 50°C / h, that is, the initial temperature is 900°C, and it is reduced to 500°C at 50°C / h, and then Infuse carbon disulfide gas at 500°C for 4 hours for heat preservation, and the rate of carbon disulfide gas introduction is 0.3L / h to obtain the primary processed product;

[0021] 2) Use borax salt bath to carry out rare earth nitrocarburizing on the primary processed products. The rare earth nitrocarburizing treatment temperature is 480°C and the time is 5h, wherein the ratio of rare earth: nitrogen atom: carbon atom is 2:5: 3. The rare earth is a combination of lanthanum and yttrium with a mass ratio of 1:1 to obtain secondary processed products;

[0022] 3) The secondary proces...

Embodiment 2

[0024] A mold heat treatment process for making an automobile metal bumper is characterized in that it comprises the following steps:

[0025] 1) Carry out gradient preheating treatment on the mold under the condition of 500-900°C, specifically, the temperature is gradually reduced from high to low at 50°C / h, that is, the initial temperature is 900°C, and it is reduced to 500°C at 50°C / h, and then Under the condition of 500°C, carbon disulfide gas was passed in for 5 hours, and the rate of carbon disulfide gas was 0.2L / h, and the primary processed product was obtained;

[0026] 2) Use borax salt bath to carry out rare earth nitrocarburizing on the primary processed products. The rare earth nitrocarburizing treatment temperature is 470°C and the time is 6h, wherein the ratio of rare earth: nitrogen atom: carbon atom is 2:5: 3. The rare earth is a combination of lanthanum and yttrium with a mass ratio of 1:1 to obtain secondary processed products;

[0027] 3) The secondary proc...

Embodiment 3

[0029] A mold heat treatment process for making an automobile metal bumper is characterized in that it comprises the following steps:

[0030] 1) Carry out gradient preheating treatment on the mold under the condition of 500-900°C, specifically, the temperature is gradually reduced from high to low at 50°C / h, that is, the initial temperature is 900°C, and it is reduced to 500°C at 50°C / h, and then Under the condition of 500°C, carbon disulfide gas was introduced for 3 hours, and the rate of introduction of carbon disulfide gas was 0.25L / h, and the primary processed product was obtained;

[0031] 2) Use borax salt bath to carry out rare earth nitrocarburizing on the primary processed products. The rare earth nitrocarburizing treatment temperature is 460°C and the time is 8h. The ratio of rare earth: nitrogen atom: carbon atom is 2:5: 3. The rare earth is a combination of lanthanum and yttrium with a mass ratio of 1:1 to obtain secondary processed products;

[0032] 3) The seco...

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Abstract

The invention discloses a thermal treatment process for a mould used for automobile metal bumper manufacturing. The thermal treatment process comprises the following steps of: performing gradient preheating treatment on the mould at a temperature of 500-900 DEG C, introducing carbon dioxide gas to preserve the heat for 2-5 hours at a temperature of 500 DEG C, thereby obtaining a preliminarily processed product; performing rare-earth nitrocarburizing on the preliminarily processed product through borax salt bath, thereby obtaining a secondarily processed product; and putting the secondarily processed product into a vanadyl chloride salt molten liquid, introducing a gas mixture, and performing thermal-insulation reaction for 1-5 hours at a temperature of 620-640 DEG C. According to the thermal treatment process disclosed by the invention, solid solution treatment, ageing thermal refining and surface infiltrated layer strengthening treatment are performed on the mould; the manufactured mould has excellent stability, wear resistance, high temperature resistance and the like, is remarkably improved in mechanical property, has hardness which can reach 2900HV, has impact resistance, and effectively prolongs effective service life by 4 times or more.

Description

technical field [0001] The invention relates to the technical field of auto parts processing, in particular to a mold heat treatment process for making automotive metal bumpers. Background technique [0002] A car bumper is a safety device that absorbs and slows down external impact and protects the front and rear of the car body; a car bumper generally includes a beam, an energy-absorbing box connected to both ends of the beam and a cover plate located on the outside of the beam and the energy-absorbing box. There are brackets and towing eyes, the brackets are used to fix the bumper on the car body, and the towing eyes are used to connect with the trailer when the car breaks down. At present, the materials for manufacturing automobile bumpers are still mainly polyurethane elastomers, ABS and other materials. Polyurethane elastomers, ABS and other materials have effectively promoted the development of automobile lightweight. The bumper system is an important part of the auto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/25C23C12/02C23C12/00
CPCC21D1/25C23C12/00C23C12/02
Inventor 周承志
Owner HEFEI DINGXIN MOLD
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