Method for processing high speed steel screw tap

A technology of processing technology and process method, applied in the direction of processing working medium, processing electrode, electric processing equipment, etc., can solve the problem of affecting the life and accuracy stability of high-speed steel taps, affecting the life of high-speed steel taps, and insufficient austenite transformation. and other problems to achieve the effect of increasing strength, improving surface stress state, and reducing the amount of retained austenite

Inactive Publication Date: 2007-04-11
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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AI Technical Summary

Problems solved by technology

[0008] 1. In the traditional heat treatment process, the transformation of retained austenite is insufficient, which affects the life of high-speed steel taps
[0009] 2. The cutting edge formed naturally after grinding is easy to chip, and the cutting stability is poor, which affects the life and precision stability of high-speed steel taps

Method used

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  • Method for processing high speed steel screw tap

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Embodiment Construction

[0022] High speed steel material W9Mo3Cr4v, tap size M24

[0023] Step 1 is the same as the prior art, that is, blanking, turning both ends, turning the outer circle, milling square, turning thread, turning the front edge and milling the spiral groove.

[0024] Step 2 is the improved heat treatment, that is, step quenching at 1230°C, cooling down to room temperature and then performing cryogenic treatment at -160°C for 9 hours, the cooling rate is 5°C / min, then returning to room temperature, and then tempering twice at 560°C×1h .

[0025] Step 3 is the same as the prior art.

[0026] Step 4 is blade-shaped processing, as shown in Figure 1, connect the tap 3 and graphite 5 to the positive and negative electrodes of the power supply 1, and put 15% NaNO together 3 In +5% NaOH composite aqueous solution, the distance between the two poles is 300mm, 15V direct current is passed through, and the electrochemical treatment is carried out, and the treatment time is 2 minutes.

[002...

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Abstract

The present invention belongs to the field of tool making technology, and is especially technological process of machining high speed steel screw tap. The technological process includes the steps of machining blank, coarse machining, heat treatment, precise machining, inspection, packing, etc. The technological process features the cold treatment after heat treatment at the temperature from -180deg.C to -160deg.C for 8-10 hr; and the edge shape machining electrochemical step after the precise machining step. During the edge shape machining electrochemical step, the screw tap connected to the positive pole of power source and the graphite connected to the negative pole are set into composite water solution of NaNO3 in 9-20 % concentration and NaOH in 2-7 % concentration, and DC voltage in 10-20 V is applied. The cryogenic treatment raises the wear resistance of the tap, and the electrochemical edge trimming raises the quality of the edge, the durability and stability of the tap.

Description

technical field [0001] The invention belongs to the technical field of metal cutting tool manufacturing, and in particular relates to a processing method for high-speed steel taps. Background technique [0002] The processing technology of high-speed steel taps currently used is: [0003] Step 1: Manufacturing blank and rough machining, that is, blanking, turning both ends, turning outer circle, milling square, turning thread, turning front edge and milling spiral groove. [0004] Step 2: heat treatment. That is, quenching in the range of 1175 ° C to 1315 ° C, and tempering at 535 ° C to 620 ° C × (1 to 4) h, (3 to 4) times. [0005] Step 3: Finishing, that is, polishing the spiral groove, grinding the center hole, grinding the front, grinding the outer circle of the shank blade, grinding the thread, marking, and relief grinding the front. [0006] Step 4: Cleaning, finished product inspection, packaging. [0007] The main problems with this process are: [0008] 1. In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/52C21D9/22C21D11/00B23H3/08B23H3/04B23H3/02
Inventor 闫献国庞思勤刘志奇李永堂李玉贵
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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