Preparation method for die graphite material used for electrical discharge machining

A graphite material and electric spark technology, which is applied in the field of mold graphite material preparation, can solve the problem that the product cannot meet the needs of users, and achieve the effect of strong practicability, full utilization of resources and cost saving.
CN102898142AActive Publication Date: 2013-01-30唐山金湾特碳石墨有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
唐山金湾特碳石墨有限公司
Publication Date
2013-01-30

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Abstract

The invention relates to a preparation method for a die graphite material used for electrical discharge machining. The preparation method comprises the following steps: crushing calcined pitch coke and artificial graphite powder; carrying out batching and adding 20 to 35% of molten asphalt; then carrying out kneading, rolling and isostatic compaction; roasting a green compact at a temperature of 850 to 1000 DEG C for 600 and 800 h; carrying out high pressure dipping with 10 to 25% of molten special dipping asphalt; then carrying out roasting at a temperature of 800 to 900 DEG C for 300 and 400 h; and finally carrying out graphitization at a temperature of 2400 to 2800 DEG C for 150 and 230 h. The preparation method provided by the invention has the advantages of simple operation, high yield, full utilization of resources, conservation of cost, capacity of allowing high volume density and mechanical strength to be maintained and strong practicality.
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Description

technical field

[0001] The invention relates to the technical field of mold graphite material preparation, in particular to a method for preparing mold graphite material used for electric discharge machining. Background technique

[0002] The large-scale mold electrode processed by high-strength graphite material is an indispensable basic material in the EDM precision machining of large-scale and special-shaped workpieces. Compared with traditional copper electrodes, graphite materials for EDM have the following advantages:

[0003] 1. Lower material cost: the price of graphite with the same volume is only 50% of copper electrode;

[0004] 2. Faster processing speed: the machining speed is 2 to 3 times that of copper electrodes, and there is no burr after processing; the discharge processing speed is 34% to 200% faster than copper electrodes;

[0005] 3. Smaller loss: the spark oil decomposes the carbide coating to compensate for the electrode loss;

[0006] 4. Lighter we...

Claims

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