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Strength-toughening treatment method of W6Mo5Cr4V2 high-speed steel broaching tool

A processing method and technology for high-speed steel, applied in heat treatment furnaces, heat treatment equipment, coatings, etc., can solve the problems of energy saving, unsatisfactory production costs, and many process steps, and achieve good blade regrindability, improved service life, and improved The effect of hardness

Active Publication Date: 2018-08-03
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above high-speed steel surface strengthening treatment technology is to carry out subsequent treatment on the finished tool to improve its performance and service life. There are many process steps, and it is not ideal in terms of energy saving and production cost.

Method used

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  • Strength-toughening treatment method of W6Mo5Cr4V2 high-speed steel broaching tool
  • Strength-toughening treatment method of W6Mo5Cr4V2 high-speed steel broaching tool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The strengthening and toughening treatment method of W6Mo5Cr4V2 high-speed steel spline broach with a size of Φ30×900mm is as follows:

[0046]Step 1, graded quenching: Preheat the high-speed steel broach in an air furnace at 500°C for 2 hours at low temperature; preheat it in a salt bath furnace at 870°C for 10 minutes at medium temperature; heat it in a high temperature salt bath furnace to 1220°C for 5 minutes; then Quenching in stages in a salt bath at a temperature of 550°C for 5 minutes.

[0047] Step 2, high-temperature tempering: temper the quenched high-speed steel broach in a 560°C salt bath furnace for 1 hour, then air-cool to room temperature, and perform 2 tempering according to this process.

[0048] Step 3, salt bath nitriding: the high-speed steel broach obtained in step 2 is subjected to salt-bath carbonitriding treatment, the method is as follows: (1) cleaning: the high-speed steel broach is cleaned with water to remove the salt on the surface; (2 ) P...

Embodiment 2

[0053] The strengthening and toughening treatment method of W6Mo5Cr4V2 high-speed steel spline broach with a size of Φ30×900mm is as follows:

[0054] Step 1: Grading quenching: Preheat the high-speed steel broach in an air furnace at 500°C for 2 hours at low temperature; preheat it in a salt bath furnace at 870°C for 10 minutes at medium temperature; heat it in a high temperature salt bath furnace to 1220°C for 5 minutes; then Quenching in stages in a salt bath at a temperature of 550°C for 5 minutes.

[0055] Step 2: Tempering at high temperature: Temper the quenched high-speed steel broach in a salt bath furnace at 560°C for 1 hour, then air-cool to room temperature, and perform tempering twice according to this process.

[0056] Step 3: salt bath nitriding: the high-speed steel broach obtained in step 2 is subjected to salt-bath carbonitriding treatment, the method is as follows: (1) cleaning: the high-speed steel broach is cleaned with water to remove the salt on the surf...

Embodiment 3

[0061] The strengthening and toughening treatment method of W6Mo5Cr4V2 high-speed steel spline broach with a size of Φ30×900mm is as follows:

[0062] Step 1: Grading quenching: Preheat the high-speed steel broach in an air furnace at 500°C for 2 hours at low temperature; preheat it in a salt bath furnace at 870°C for 10 minutes at medium temperature; heat it in a high temperature salt bath furnace to 1220°C for 5 minutes; then Quenching in stages in a salt bath at a temperature of 550°C for 5 minutes.

[0063] Step 2: Tempering at high temperature: Temper the quenched high-speed steel broach in a salt bath furnace at 560°C for 1 hour, then air-cool to room temperature, and perform tempering twice according to this process.

[0064] Step 3: salt bath nitriding: the high-speed steel broach obtained in step 2 is subjected to salt-bath carbonitriding treatment, the method is as follows: (1) cleaning: the high-speed steel broach is cleaned with water to remove the salt on the surf...

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Abstract

The invention discloses a strength-toughening treatment method of a W6Mo5Cr4V2 high-speed steel broaching tool, and belongs to the technical field of alloy tool steel heat treatment technology. The method specifically comprises the following steps that the W6Mo5Cr4V2 high-speed steel broaching tool is subject to graded quenching in a salt bath; high-temperature tempering is carried out two times;salt bath nitrogen carbon co-cementation treatment is carried out, the temperature ranges from 540 DEG C to 550 DEG C, and time ranges from 20 min to 40 min; finally, liquid oxidizing treatment is carried out, the temperature ranges from 350 DEG C to 380 DEG C, time ranges from 20 min to 30 min, and discharge cooling to the room temperature is achieved; salt bath nitriding and liquid oxidizing arerepeated for multiple times, and the diffusion layer depth is increased. The strength tightening of the W6Mo5Cr4V2 high-speed steel broaching tool is improved, the impregnating layer depth is obviously increased, the surface hardness of the broaching tool is effectively improved, the service life of the broaching tool can be prolonged by two to four times, in addition, after the broaching tool isused for a while, the blade regrinding property is better than that of existing one-time nitriding treatment.

Description

technical field [0001] The invention belongs to the technical field of alloy tool steel heat treatment technology, and in particular relates to a strengthening and toughening treatment method for a W6Mo5Cr4V2 high-speed steel broach. Background technique [0002] W6Mo5Cr4V2 high-speed steel is widely used to manufacture various types of non-standard broaches, such as spline broaches, round broaches, and keyway broaches, due to its high hardness, high wear resistance, good thermal stability, red hardness, and moderate price And polygon broaches, etc. The modern manufacturing and processing industry has put forward the requirements of high cutting speed, high precision, long life and good reliability for high-speed steel cutting tools. Toughness, thereby prolonging the life of high-speed steel tools and reducing production costs. There are two main methods to improve the strength and toughness of high-speed steel: 1. Adjust the chemical composition of high-speed steel or imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/22C21D1/18C23C8/58
CPCC21D1/18C21D9/22C23C8/58
Inventor 蔡强刘学然安晶庞绍平苏桂花姜翠凤杨子润黎水平
Owner YANCHENG INST OF TECH
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