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Heat treatment process for bearing ring cold extrusion mould

A bearing ring and cold extrusion technology, which is applied in the field of heat treatment of bearing ring cold extrusion dies, can solve problems such as wear, short service life, and increased bearing production costs, and achieve reasonable process design, improved mechanical properties, and The effect of reducing production costs

Inactive Publication Date: 2015-03-11
JIANGYIN JIB WD PRECISION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bearing ring cold extrusion dies are frequently subjected to large stresses such as compression, impact, and friction during work, and the die is prone to cracking and wear. Among them, cracking failure is the most common phenomenon, which makes the die invalid. The cold extrusion of bearing rings The average number of uses of the press die is about 5000~6000 times, and the service life is short, which increases the production cost of the bearing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Include the following steps:

[0023] 1) Forging, upsetting and elongating the W6M o5Cr4V2 steel billet for 8 times, the forging heating temperature is 1130°C, the initial forging temperature is 1100°C, the final forging temperature is 850°C, and the total forging ratio is 3;

[0024] 2) Annealing, heating to 900°C, heat preservation for 2 hours; furnace cooling to 730°C, heat preservation for 3 hours; furnace cooling rate ≤ 40°C / hour, below 500°C out of the furnace and air cooling;

[0025] 3) Quenching, preheating at 820°C, heat preservation 18 seconds / mm; heating to 1120°C, heat preservation 12 seconds / mm; furnace cooling to 660°C, heat preservation 10 seconds / mm; air cooling below 500°C;

[0026] 4) Temper twice, tempering temperature 350°C, air cooling for 2~3 hours; hardness after tempering is 64HRC;

[0027] 5) Salt bath nitriding surface treatment, temperature 550 ° C, 25 hours air cooling, nitriding layer thickness 0. 2 ~ 0. 3 mm.

[0028]

Embodiment 2

[0030] Include the following steps:

[0031] 1) Forging, upsetting and elongating the W6M o5Cr4V2 steel billet for 6 times, the forging heating temperature is 1150°C, the initial forging temperature is 1130°C, the final forging temperature is 900°C, and the total forging ratio is 3;

[0032] 2) Annealing, heating to 900°C, heat preservation for 3 hours; furnace cooling to 700C, heat preservation for 3 hours; furnace cooling rate ≤ 40°C / hour, below 500°C out of the furnace and air cooling;

[0033] 3) Quenching, preheating at 850°C, heat preservation 20 seconds / mm; heating to 1150°C, heat preservation 15 seconds / mm; furnace cooling to 660°C, heat preservation 10 seconds / mm; air cooling below 500°C;

[0034] 4) Tempering twice, tempering temperature 380°C, air cooling for 3 hours; hardness after tempering 64HRC;

[0035] 5) Salt bath nitriding surface treatment, temperature 580 ° C, 30 hours air cooling, nitriding layer thickness 0. 2 ~ 0. 3 mm.

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PUM

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Abstract

The invention relates to a heat treatment process for a bearing ring cold extrusion mould. The heat treatment process is characterized by comprising the following steps: 1) forging: upsetting a steel billet for 6-10 times, drawing and forging, wherein the total forging ratio is 3; 2) annealing; 3) quenching; 4) tempering twice; 5) performing salt bath nitriding surface treatment. The heat treatment process for the bearing ring cold extrusion mould is reasonable in process design; by the heat treatment process, mechanical properties of a steel material are effectively improved, the steel material has an average using frequency about 10000 times, the service life of the mould is prolonged, and the production cost of a bearing is reduced.

Description

technical field [0001] The invention relates to a die processing technology, in particular to a heat treatment technology for a cold extrusion die of a bearing ring. Background technique [0002] W6Mo5Cr4V2 high-speed tool steel has high hardness, high wear resistance, high thermal hardness, high hardenability and sufficient plasticity and toughness, and has good casting, forging, welding and machining properties, so it occupies an important position in tool steel It is widely used in the manufacture of high-strength and toughness cold-working dies, and some bearing ring cold-extrusion dies are also made of this steel. Bearing ring cold extrusion dies are frequently subjected to large stresses such as compression, impact, and friction during work, and the die is prone to cracking and wear. Among them, cracking failure is the most common phenomenon, which makes the die invalid. The cold extrusion of bearing rings The average number of times the press die is used is about 500...

Claims

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Application Information

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IPC IPC(8): C23F17/00
Inventor 程万丁沈强
Owner JIANGYIN JIB WD PRECISION