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Valve hot forging die reinforcement method

A technology of strengthening treatment and hot forging die, applied in the field of heat treatment, can solve the problems of large die consumption, high cost, long die change time, etc., to reduce consumption and use cost, improve fatigue resistance, and reduce die change time. Effect

Inactive Publication Date: 2016-12-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The valve is generally made of austenitic heat-resistant steel such as 21-4N (5Cr21Mn9Ni4N) and other materials. The forging temperature is high, generally above 1000°C; the forging die is subjected to strong friction and thermal fatigue during use, and its service life is short. Usually forging 1500 The forging die needs to be replaced for the left and right valves; the consumption of the die is large and the cost is high; at the same time, the time for changing the die is generally long, which takes 2-3 hours, and the production efficiency is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A valve hot forging die strengthening treatment method, which is to carry out three-step strengthening treatment on the basis of conventional heat treatment (high temperature tempering treatment at 550°C-580°C after overall quenching): the first step, high temperature and low vacuum ion nitriding treatment : Temperature 540°C-560°C, vacuum degree 10Pa-20Pa, infiltration layer thickness 0.7mm-0.9mm; second step, high temperature and low vacuum Ti-N co-infiltration treatment, temperature 540°C-560°C, vacuum degree 10Pa-20Pa, The thickness of the infiltration layer is 0.4mm-0.6mm; the third step is high-temperature and high-vacuum W-Mo-Co-N co-infiltration treatment, the temperature is 540°C-560°C, and the vacuum degree is 10 -3 Pa-10 -4 Pa, the thickness of the seepage layer is 0.2mm-0.3mm.

Embodiment 2

[0020] The valve forging die material is H13 (4Cr5MoSiV1), and on the basis of conventional heat treatment (after overall quenching and high temperature tempering treatment at 550°C-580°C), three-step strengthening treatment is carried out: the first step is high-temperature and low-vacuum ion nitriding treatment: Temperature 540°C-560°C, vacuum degree 10Pa-20Pa, infiltration layer thickness 0.8mm-0.9mm; second step, high temperature and low vacuum Ti-N co-infiltration treatment, temperature 540°C-560°C, vacuum degree 10Pa-20Pa, infiltration The thickness of the layer is 0.5mm-0.6mm; the third step is high temperature and high vacuum W-Mo-Co-N co-infiltration treatment, the temperature is 540°C-560°C, the vacuum degree is 10 -3 Pa-10 -4 Pa, the thickness of the seepage layer is 0.25mm-0.3mm.

Embodiment 3

[0022] The material of the valve forging die is HM1 (3Cr3Mo3W2V). On the basis of conventional heat treatment (tempering at 550°C-580°C after overall quenching), three-step strengthening treatment is carried out: the first step is high-temperature and low-vacuum ion nitriding treatment: Temperature 540°C-560°C, vacuum degree 10Pa-20Pa, infiltration layer thickness 0.7mm-0.8mm; second step, high temperature and low vacuum Ti-N co-infiltration treatment, temperature 540°C-560°C, vacuum degree 10Pa-20Pa, infiltration The thickness of the layer is 0.4mm-0.5mm; the third step is high temperature and high vacuum W-Mo-Co-N co-infiltration treatment, the temperature is 540°C-560°C, the vacuum degree is 10 -3 Pa-10 -4 Pa, the thickness of the seepage layer is 0.2mm-0.25mm.

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Abstract

The invention belongs to the technical field of heat treatment and relates to a valve hot forging die reinforcement method. Three reinforcement steps are performed on the basis of conventional heat treatment and include: step one, high-temperature low-vacuum ionic nitriding treatment, wherein the temperature is 540-560 DEG C, the vacuum degree is 10Pa-20Pa, and the permeation layer thickness is 0.7mm-0.9mm; step two, low-temperature low-vacuum Ti-N co-permeation treatment, wherein the temperature is 540-560 DEG C, the vacuum degree is 10Pa-20Pa, and the permeation layer thickness is 0.4mm-0.6mm; step three, high-temperature high-vacuum W-Mo-Co-N co-permeation treatment, wherein the temperature is 540-560 DEG C, the vacuum degree is 10<-3>Pa-10<-4>Pa, and the permeation layer thickness is 0.2mm-0.3mm. Since a surface layer of a die is a high-hardness microcrystalline structure, high abrasion resistance is achieved; composite permeation layer hardness is in gradient distribution, and accordingly fatigue resistance is improved; the service life of the die is prolonged; production efficiency is improved.

Description

technical field [0001] The invention relates to heat treatment technology, and strengthens a mold, in particular, relates to a strengthening treatment method for a hot forging mold of a valve. Background technique [0002] Valve hot forging die materials are H13 (4Cr5MoSiV1) and HM1 (3Cr3Mo3W2V). The current general heat treatment process is after overall quenching, high temperature tempering at 550°C-580°C, and then nitriding treatment. The surface hardness reaches 58-60HRC. The valve is generally made of austenitic heat-resistant steel such as 21-4N (5Cr21Mn9Ni4N) and other materials. The forging temperature is high, generally above 1000°C; the forging die is subjected to strong friction and thermal fatigue during use, and its service life is short. Usually forging 1500 The forging die needs to be replaced for the left and right valves; the consumption of the die is large and the cost is high; at the same time, the time for changing the die is generally long, which takes 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/38C23C12/02C21D1/18C21D9/00
CPCC21D1/18C21D9/0068C23C8/38C23C12/02
Inventor 罗建东翁明鑫
Owner SOUTH CHINA UNIV OF TECH