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Method and tooling for electric spark machining of internal thread of hard alloy product

A technology of hard alloy and processing method, which is applied in the direction of electric processing equipment, metal processing equipment, accessory devices, etc., and can solve the problems of small effective working area of ​​electrodes, affecting the quality of internal threads, and difficulty in ensuring the size and shape accuracy of internal threads, etc.

Active Publication Date: 2015-06-03
成都科力铁硬质合金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the internal thread of cemented carbide can be formed by special molding or compaction, it is difficult to guarantee the internal thread of the cemented carbide sintered product after shrinkage due to the large non-uniform shrinkage due to the sintering of the compact into the final product. Dimensional and shape accuracy, so the internal thread of cemented carbide sintered products can only be completed by subsequent processing
[0003] The processing of internal threads can usually only be completed by turning, tapping, whirlwind milling and other processing methods. Carbide sintered products have extremely high hardness, and subsequent processing can only be carried out by grinding, wire cutting and electric spark. Internal thread processing methods such as tapping, whirling milling, etc. cannot be used to process internal threads of cemented carbide sintered products, and grinding and wire cutting processing cannot realize internal thread processing. Therefore, only EDM methods can be used to process hard alloy sintered products. Quality alloy internal thread for processing
[0004] Usually, the EDM internal thread is completed by the Z-axis rotation with the electrode and the movement of the translation device for clamping the product. This processing method is completed by gradual screwing. The actual effective working area of ​​the electrode is small and the processing The efficiency is low, and the movement of the translation device will cause a certain collision between the electrode and the product, which will affect the quality of the internal thread. There is a certain demand for cemented carbide products with connecting internal threads. How can we improve the processing efficiency of cemented carbide internal threads? Efficiency and better processing quality of carbide internal thread are technical issues that need to be further improved in the industry

Method used

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  • Method and tooling for electric spark machining of internal thread of hard alloy product
  • Method and tooling for electric spark machining of internal thread of hard alloy product
  • Method and tooling for electric spark machining of internal thread of hard alloy product

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A method for machining internal threads of cemented carbide products by electric discharge of the present invention:

[0040] Carbide grade is: YG8

[0041] Product processing requirements: The internal thread specification of the product is M8 right-handed thread, the major diameter of M8 internal thread is 8mm, the minor diameter of M8 internal thread is 6.75mm, the middle diameter is 7mm, the minor diameter of one-half is 3.375mm, and the pitch is 1.25 mm, the length of the threaded section is 10mm.

[0042] The processing steps are as follows:

[0043] S1. Threaded bottom hole processing, a threaded bottom hole with a diameter of 6.75 mm is processed on the cemented carbide product 5 .

[0044] S2. tooling production, including making the electrode 4 for discharging the cemented carbide product 5 and the screw clamping device for clamping the cemented carbide product 5, the specific steps are as follows:

[0045] S21. Fabrication of electrode 4, refer to figure ...

Embodiment 2

[0057] A method for machining internal threads of cemented carbide products by electric discharge of the present invention:

[0058] Carbide grade: YN10

[0059] Product processing requirements: The internal thread specification of the product is M10 left-handed thread, the major diameter of M10 internal thread is 10mm, the minor diameter of M10 internal thread is 8.376mm, the middle diameter is 9.026mm, the minor diameter of one-half is 4.188mm, and the pitch is 1.5 mm, the thread length is 22.5mm.

[0060] The processing steps are as follows:

[0061] S1. Threaded bottom hole processing, a threaded bottom hole with a diameter of 8.376 mm is processed on the cemented carbide product 5 .

[0062] S2. tooling production, including making the electrode 4 for discharging the cemented carbide product 5 and the screw clamping device for clamping the cemented carbide product 5, the specific steps are as follows:

[0063] S21. Fabrication of electrode 4, refer to figure 1 , fig...

Embodiment 3

[0074] A method for machining internal threads of cemented carbide products by electric discharge of the present invention:

[0075] Carbide grade is: YG20C

[0076] Product processing requirements: The internal thread specification of the product is M20 right-handed thread, the major diameter of M20 internal thread is 20mm, the minor diameter of M20 internal thread is 17.294mm, the middle diameter is 18.376mm, the minor diameter of one-half is 8.647mm, and the pitch is 2.5mm, the length of the threaded section is 32.5mm.

[0077] The processing steps are as follows:

[0078] S1. Threaded bottom hole processing, a threaded bottom hole with a diameter of 17.294 mm is processed on the cemented carbide product 5 .

[0079] S2. tooling production, including making the electrode 4 for discharging the cemented carbide product 5 and the screw clamping device for clamping the cemented carbide product 5, the specific steps are as follows:

[0080] S21. Fabrication of electrode 4, refe...

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Abstract

The invention discloses a method and a tooling for electric spark machining of an internal thread of a hard alloy product. The method comprises the following steps of S1: thread bottom hole machining; S2: tooling fabrication, including fabricating an electrode for discharging to the hard alloy product and a spiral clamping device for clamping the hard alloy product, and specifically including the following steps of S21: electrode fabrication; S22: spiral clamping device fabrication; S3: tooling installation; S4: product clamping; S5: internal thread machining, wherein the tooling includes the electrode for discharging to the hard alloy product and the spiral clamping device for clamping the hard alloy product. The method and the tooling for electric spark machining of the internal thread of the hard alloy product disclosed by the invention have the advantage that the machining of the internal thread of the hard alloy product and the machining of various internal circular large spiral grooves can be performed on an electric spark machine tool without Z-axis rotation.

Description

technical field [0001] The invention belongs to the technical field of hard alloy manufacturing, and in particular relates to a processing method and tooling for electric discharge machining of inner threads of hard alloy products. Background technique [0002] The cemented carbide manufacturing process consists of three parts: mixture preparation, press forming and sintering. Although the internal thread of cemented carbide can be formed by special molding or compaction, it is difficult to guarantee the internal thread of the cemented carbide sintered product after shrinkage due to the large non-uniform shrinkage due to the sintering of the compact into the final product. Dimensional and shape accuracy, so the internal thread of cemented carbide sintered products can only be completed by subsequent processing. [0003] The processing of internal threads can usually only be completed by turning, tapping, whirlwind milling and other processing methods. Carbide sintered produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23H9/00B23H11/00
CPCB23H1/00B23H9/003B23H11/003
Inventor 苏华谷亩史恋涛
Owner 成都科力铁硬质合金有限公司
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