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Heat treatment method for reducing automobile insert deformation

A heat treatment method and insert technology, which is applied in the field of mold manufacturing, can solve problems such as unfavorable splicing of inserts, and achieve the effects of simple heat treatment steps, reduced dimensional deviation, and reduced thermal stress and phase transition stress

Active Publication Date: 2015-04-22
娄底市洪申科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the size deviation of the automobile insert prepared by the traditional process, which causes the insert to be unfavorable for splicing in the stamping die, and to provide a heat treatment method for reducing the deformation of the automobile insert; The improvement of the block heat treatment process greatly reduces the size deviation of the insert, and can obtain high-quality automobile body parts when applied to the stamping die

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In this embodiment, because the heat treatment temperature is too high, the crystal grains will grow excessively and the plasticity will be reduced. However, if the temperature is too low, a completely recrystallized structure cannot be obtained, and the purpose of eliminating processing stress cannot be achieved. If the cooling rate is too fast, it is easy to cause temperature difference stress and cause cracking. If the cooling rate is too slow, it will cause age hardening and increase the difficulty of the next pass. From the perspective of reducing heat treatment deformation of automobile inserts, a heat treatment method with simple steps, low input cost and easy control is designed. The specific steps are:

[0028] Step 1: Carry out annealing treatment on the automobile insert blank. The specific annealing treatment process is as follows: heat the insert blank to 860°C, keep it for 3 hours, cool it in the furnace to 620°C, keep it for 5 hours, then cool it down t...

Embodiment 2

[0035] A heat treatment method for reducing the deformation of automobile inserts in this embodiment is basically the same as that in Example 1, except that in step 1 of this embodiment, the insert blank is heated to 840°C, kept for 2 hours, and cooled to 640°C in the furnace , heat preservation for 4 hours, and then furnace cooled to below 500 ℃ and air-cooled. In step 2, the first section is heated to 600°C with the furnace; the second section is heated to 940°C. The thickness of the nano-ceramic coating used in step 4 is 2mm.

Embodiment 3

[0037] A heat treatment method for reducing the deformation of automobile inserts in this embodiment is basically the same as in Example 1, the difference is that in step 1 of this embodiment, the insert blank is heated to 880°C, kept for 4 hours, and then furnace cooled to 600°C , heat preservation for 6 hours, and then furnace-cooled to below 500 ° C, out of the furnace and air-cooled. In step 2, the first section is heated to 650°C with the furnace; the second section is heated to 1010°C. The thickness of the nano-ceramic coating used in step 4 is 1.5 mm.

[0038]A heat treatment method for reducing the deformation of automobile inserts described in Examples 1 to 3, through the improvement of the heat treatment process of automobile inserts, greatly reduces the size deviation of the inserts, and can obtain high-quality products when applied to stamping dies. Auto body parts, and the heat treatment steps are simple, low input cost, easy to control, 30 pieces of finished ins...

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Abstract

The invention discloses a heat treatment method for reducing automobile insert deformation, belonging to the technical field of mould making. The method comprises the following steps: performing annealing treatment on an automobile insert blank, and performing rough machining; performing segment heating of the insert by a vacuum gas quenching furnace: heating the first segment to 600-650 DEG C along with the furnace, and preserving heat for (20+average thickness of insert / 2) minutes; heating the second segment to 940-1,010 DEG C, and preserving heat for (25+average thickness of insert / 2) minutes; introducing argon into the vacuum gas quenching furnace under an inflation pressure not higher than 105 Pa, and quickly cooling the insert to below 400 DEG C; putting the insert into a cooling control device, controlling the insert to rotate and measuring the surface temperature of the insert in the cooling process; and when the surface temperature of the insert is below 200 DEG C, discharging and performing air cooling to room temperature. In the invention, by improving the heat treatment process for an automobile insert, the size deviation of the insert is greatly reduced; and high-quality automobile body parts can be obtained by applying the heat treatment method to a stamping mould.

Description

technical field [0001] The invention relates to the technical field of mold manufacturing, and more specifically relates to a heat treatment method for reducing deformation of an automobile insert. Background technique [0002] Now, my country is vigorously developing the automobile industry, and the mold manufacturing industry is also driven by it, which is developing rapidly. Stamping dies for automobile bodies have high technical requirements and difficult processing in die manufacturing. The quality of automobile body parts depends directly on the manufacturing level of the part mold. [0003] At present, there are more and more places where heat-treated forged inserts are used in automobile stamping dies, and the processing and assembly process of inserts is becoming more and more important. However, after quenching, the inserts prepared by the traditional process are prone to insufficient surface precision or dimensional deviation. The production of stamping dies is...

Claims

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Application Information

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IPC IPC(8): C21D9/00
CPCC21D1/18C21D1/26C21D1/68C21D9/0068C21D11/005
Inventor 李大志
Owner 娄底市洪申科技有限公司
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