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Fine blanking die and fine blanking method having both overall strength and work hardening of blanking surface

A technology of overall strength and work hardening, applied in the field of fine blanking dies and fine blanking, can solve the problems of complex procedures and high production costs, and achieve the effects of reducing production costs, improving hardness and eliminating anisotropy.

Active Publication Date: 2022-02-22
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a fine blanking die and a fine blanking method with both overall strength and work hardening of the blanking surface, so as to solve the problems of complex procedures and high production costs in the fine blanking process of medium carbon steel existing in the related art

Method used

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  • Fine blanking die and fine blanking method having both overall strength and work hardening of blanking surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] 1. Use a shearing machine to cut the 30CrMnSiA steel sheet with a thickness of 3mm into a square steel plate of 300×300mm. Put the obtained steel plate into a vacuum heating furnace and heat it to 870°C for 1 hour. After the heat preservation is completed, it is slowly cooled to 500°C, then take out the steel plate with a tool and cool it to room temperature in air.

[0053] 2. Put the annealed steel plate obtained in step 1 into a salt bath heating furnace and heat it to 870°C for 1 hour. After the heat preservation is over, put it in quenching oil to cool. Put the quenched steel plate into a vacuum furnace and heat it to 650°C for 2 hours. After air-cooling to room temperature, complete high-temperature tempering, realize carbide spheroidization, and obtain a steel plate with high strength and high plasticity.

[0054] 3. The size of the steel plate to be processed: the thickness is 3mm, the area is 70685mm 2 , according to the size of the steel plate to be formed to...

Embodiment 2

[0058] 1. Use a shearing machine to cut the 42CrMo4 steel sheet with a thickness of 3.5mm into a square steel plate of 310×310mm. Put the obtained steel plate into a vacuum heating furnace and heat it to 870°C for 1 hour. Cool to 500°C, then take out the steel plate with a tool and cool it to room temperature in air.

[0059] 2. Put the annealed steel plate obtained in step 1 into a salt bath heating furnace and heat it to 870°C for 1 hour. After the heat preservation is over, put it in quenching oil to cool. Put the quenched steel plate into a vacuum furnace and heat it to 650°C for 2 hours. After air-cooling to room temperature, complete high-temperature tempering, realize carbide spheroidization, and obtain a steel plate with high strength and high plasticity.

[0060] 3. The size of the steel plate to be processed: the thickness is 3.5mm, and the area is 70685mm 2 , according to the size of the steel plate to be formed to calculate the punching force P in the process of f...

Embodiment 3

[0064] 1. Use a shearing machine to cut the 30CrSiMoVM steel sheet with a thickness of 4.0mm into a square steel plate of 450×450mm. Put the obtained steel plate into a vacuum heating furnace and heat it to 870°C for 1 hour. Cool to 500°C, then take out the steel plate with a tool and cool it to room temperature in air.

[0065] 2. Put the annealed steel plate obtained in step 1 into a salt bath heating furnace and heat it to 870°C for 1 hour. After the heat preservation is over, put it in quenching oil to cool. Put the quenched steel plate into a vacuum furnace and heat it to 650°C for 2 hours. After air-cooling to room temperature, complete high-temperature tempering, realize carbide spheroidization, and obtain a steel plate with high strength and high plasticity.

[0066] 3. The size of the steel plate to be processed: the thickness is 4mm, the area is 70685mm 2 , according to the size of the steel plate to be formed to calculate the punching force P in the process of fine...

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Abstract

The invention discloses a fine-blanking die and a fine-blanking method that have both overall strength and work-hardening of the blanking surface. The fine-blanking die includes a punch, a back punch, a V-shaped gear plate and a die, wherein the die The bottom has a V-shaped ring gear opposite to the position of the pressure plate ring gear, the height of the side wall of the die is not higher than the thickness of the steel plate, and there is an outer chamfer at the entrance of the die; The punching method includes the following steps: 1) homogenization heat treatment: complete annealing of the steel plate in a vacuum furnace; 2) strengthening heat treatment: quenching and high temperature tempering heat treatment of the steel plate to realize carbide spheroidization and obtain strength and plasticity Good fit; 3) Fine blanking forming to obtain fine blanking parts with overall strength and surface hardening. The invention can realize the fine blanking forming of high-strength medium carbon steel, avoid the subsequent heat treatment strengthening process of the fine blanking parts, retain the work hardening effect of the fine blanking parts, reduce the process and reduce the cost.

Description

technical field [0001] The invention belongs to the field of fine blanking, and in particular relates to a fine blanking die and a fine blanking method with both overall strength and work hardening of the blanking surface. Background technique [0002] Due to the advantages of high production efficiency, low cost, high material utilization rate, and easy automation, fine blanking is widely used in the manufacture of parts such as automobiles and aircraft. In order to achieve good fine blanking performance, the fine blanking material should have a low strength and high plasticity. [0003] The traditional fine blanking process of medium carbon steel is: spheroidizing annealing-fine blanking forming-intensified heat treatment-surface quenching. In order to meet the material performance requirements of fine blanking, it is first necessary to perform spheroidizing annealing on the blank to improve the plasticity of the material, and then perform fine blanking. After fine blanki...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D28/14B21D28/02B21D37/16C21D1/26C21D1/773C21D1/18C21D1/46
CPCB21D28/14B21D28/02B21D37/16C21D1/26C21D1/773C21D1/18C21D1/46
Inventor 陈刚王静陈强常旭升张鸿名
Owner HARBIN INST OF TECH AT WEIHAI