Bipolar pulse electrolysis-jet current composite processing method for YG hard alloys

A bipolar pulse, cemented carbide technology is applied in the field of non-traditional processing technology and surface treatment and surface modification, which can solve the problems of low processing efficiency and processing accuracy, complex equipment, low surface layer quality and processing efficiency, etc. Achieve the effect of less one-time investment cost, lower surface roughness value, and higher material removal rate

Inactive Publication Date: 2009-09-16
DALIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conventional electrolytic machining process uses a strong alkaline solution as the electrolyte. The equipment and process are relatively simple, but the machining efficiency and machining accuracy are relatively low, and the obtained surface roughness (Ra=0.16~1.25μm) is worse than that of the ultrasonic machining method. , and there is a certain amount of environmental pollution
EDM and laser processing mainly use electrothermal effect and photothermal effect to remove materials. Since cemented carbide is composed of metal carbides (WC, TiC, TaC, NbC, etc.) with high hardness, high melting point, and good chemical and thermal stability ) and metal binders (Co, Ni, Mo) are made by powder metallurgy, so the use of EDM and laser processing to process cemented carbide has the disadvantages of many thermal influence factors, low surface layer quality and low processing efficiency.
Electron beam and ion beam processing need to be carried out in a vacuum environment, and the equipment cost is high
Ultrasonic processing is mainly suitable for processing non-metallic brittle materials such as glass and ceramics. When processing cemented carbide, it can obtain better surface roughness (Ra=0.1-1μm), but there are problems of low processing efficiency and large local loss of tools. shortcoming
Ultrasonic electrolysis composite processing technology uses neutral inorganic salt solution as the electrolyte, which can obtain high processing efficiency and processing accuracy, but there are many influencing factors, the process is difficult, and the required equipment is relatively complicated. It is mainly suitable for micro-processing occasions; The polar pulse electro-hydraulic beam processing technology uses weakly alkaline inorganic salt solution as the electrolyte, which greatly reduces environmental pollution. The equipment and process are relatively simple, but the processing efficiency and processing accuracy need to be further improved

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Processing requirements: machining a counterbore with a diameter of 6mm and a depth of 15mm on YG cemented carbide, the diameter deviation is less than 0.06mm, and the surface roughness value is Ra 0.2-0.3μm.

[0039] The processing method steps are as follows:

[0040] (1) Configure the electrolyte:

[0041] The electrolyte is NaNO 3 , NaKC 4 h 4 o6 、NaNO 2 、Na 2 HPO 4 The aqueous solution, each component mass percent is as follows:

[0042] NaNO 3 15%

[0043] NaKC 4 h 4 o 6 10%

[0044] NaNO 2 7%

[0045] Na 2 HPO 4 5%

[0046] h 2 O 63%

[0047] pH value=7.5, temperature T=30°C;

[0048] (2) Preparation of electrodes:

[0049] Using artificial diamond as raw material, it is prepared into a tubular cylinder with a diameter of 5.8mm, and the end surface of the head has 11 liquid jet holes with a diameter of 0.2mm;

[0050] (3) Bipolar pulse electrolysis-jet composite reaction process:

[0051] Put the YG-type hard alloy...

Embodiment 2

[0053] Processing requirements: Machining straight grooves with a length of 10mm, a depth of 5mm, and a width of 1mm on YG cemented carbide, the dimensional deviation of the width and length directions does not exceed 0.06mm, and the surface roughness value Ra is within 0.3μm.

[0054] The processing method steps are as follows:

[0055] (1) Configure the electrolyte:

[0056] The electrolyte is NaNO 3 , NaKC 4 h 4 o 6 、NaNO 2 , and Na 2 B 4 o 7 The aqueous solution, each component mass percent is as follows:

[0057] NaNO 3 15%

[0058] NaKC 4 h 4 o 6 10%

[0059] NaNO 2 7%

[0060] Na 2 B 4 o 7 5%

[0061] h 2 O 63%

[0062] pH value=7.6, temperature T=35°C;

[0063] (2) Preparation of electrodes:

[0064] Using artificial diamond as raw material, it is prepared into a sheet-shaped hexagon with a length of 11mm, a height of 6mm, and a width of 0.8mm. There are 20 liquid jet holes with a diameter of 0.1mm on the end su...

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Abstract

The invention relates to non-conventional processing technology and surface modification in surface treatment, in particular to a bipolar pulse electrolysis-jet current composite processing method for YG hard alloys. The method adopts neutral inorganic salt solution as electrolyte, and combines the jet current technical characteristics and scouring and polishing functions of electrolyte jet current to remove passive films and other electrolysis products on the processed surface in time so as to obtain higher processing efficiency and improve the working environment greatly. The method has the characteristics of less influence factors, comparatively simple process, low equipment cost, low disposable investment expense, safety, environmental protection and the like, organically combines electrolysis processing technology and jet current processing technology, develops novel physical and electrochemical composite processing technology, widens the application range of electrochemical processing technology, and provides technical foundation for processing other high-hardness conducting materials.

Description

technical field [0001] The invention relates to non-traditional processing technology and surface treatment surface modification, in particular to a bipolar pulse electrolysis-jet composite processing method of YG hard alloy. Background technique [0002] Because YG-type cemented carbide is a high-hardness metal material widely used in machinery manufacturing, petroleum, mining, geology and other industries. At present, at home and abroad, for high-hardness and difficult-to-machine materials such as YG-type cemented carbide, the forming process mainly focuses on material removal, especially when processing with certain precision and surface roughness requirements, the feasible methods include electrolytic machining and electric spark. Processing, laser processing, electron beam, ion beam processing, ultrasonic processing, ultrasonic-electrolytic composite processing and other methods. The conventional electrolytic machining process uses a strong alkaline solution as the ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F3/26
Inventor 吴蒙华王珍包胜华贾卫平
Owner DALIAN UNIV
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