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
CN1943974AInactive Publication Date: 2007-04-11TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
Publication Date
2007-04-11
Estimated Expiration
Not applicable · inactive patent

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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.
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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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