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Method for processing high speed steel screw tap

A process method and a taper processing technology, which are applied in the field of high-speed steel tap processing technology, can solve problems affecting the life and precision stability of high-speed steel taps, insufficient austenite transformation, and affecting the life of high-speed steel taps, etc., to achieve increased strength, reducing the amount of retained austenite, and improving the effect of surface stress state

Inactive Publication Date: 2008-12-24
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 background technology, 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] The third step is 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.

[0026] Step 4 is blade shape processing, such as figure 1 As shown, connect the tap 3 and the graphite 5 to the positive and negative electrodes of the power supply 1 respectively, and put them together into 3...

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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 blanks and rough machining, including blanking, turning both end faces, outer circle turning, square milling, thread turning, front turning and spiral groove milling. [0004] Step 2: heat treatment. That is, quenching in the range of 1175°C to 1315°C, tempering 3 to 4 times at 535°C to 620°C for 1h to 4h. [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 the tradition...

Claims

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Application Information

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Patent Type & Authority Patents(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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