Preparation method of superfine-structure graphite used for electric spark machining

A fine structure, electric spark technology, applied in the direction of manufacturing tools, ceramic molding machines, etc., can solve the problem that the product cannot meet the needs of users, and achieve the effect of improving the mechanical strength

Pending Publication Date: 2018-04-13
天津锦美碳材科技发展有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Domestic enterprises are still in the exploratory stage of research on the preparation method of this graphite electrode, and the products are still far from meeting the needs of users

Method used

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  • Preparation method of superfine-structure graphite used for electric spark machining

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Experimental program
Comparison scheme
Effect test

Embodiment

[0033] ① Fully mix 100kg of pitch and 100kg of mesocarbon microspheres with a particle size of less than 5μm under heating, and the heating temperature is 250°C.

[0034] ② Fully mix 250kg of calcined petroleum coke powder with a particle size of less than 5μm and 50kg of artificial graphite powder with a particle size of less than 5μm.

[0035] ③Knead 200kg of the mixture in step ① and 300kg of the mixture in step ②. The kneading process needs to be heated. The heating temperature is 200°C and the kneading time is 90min.

[0036] ④Transfer all the raw materials kneaded in step ③ to the isostatic pressing mold, evacuate it to 20KPa, and then move it to the isostatic pressing machine for compression molding. 10 minutes, then release the pressure to 70MPa at a pressure relief rate of 15MPa / min, and stabilize the pressure for 5 minutes; then release the pressure to 40MPa at a pressure relief rate of 10MPa / min, and stabilize the pressure for 5 minutes; finally release the pressure...

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Abstract

The invention discloses a preparation method of superfine-structure graphite used for electric spark machining. Main raw materials comprise calcined petroleum coke, artificial graphite, asphalt and intermediate-phase carbon microspheres. The preparation method sequentially comprises the following steps: grinding powder, screening, mixing kneading, isostatic-pressure molding, roasting, graphitizing, resin impregnation and the like, thereby preparing the superfine-structure graphite used for the electric spark machining. The preparation method of the superfine-structure graphite used for the electric spark machining is simple to operate, sufficiently utilizes resources, is high in yield, reduces the cost, has relatively high volume density and mechanical strength, and fills up the blank of superfine-structure graphite used for electric spark in China.

Description

technical field [0001] The invention relates to the field of graphite material preparation, in particular to a method for preparing superfine graphite used for electric discharge machining. technical background [0002] EDM is one of the important processes for processing metal parts with complex structures. It uses continuously moving electrode materials to perform pulse spark discharge on the workpiece, etch away the metal, and cut and shape it. It is often used in the production of blanking dies and casting dies. There are many electrode materials currently used in the EDM industry, mainly including metal electrodes and non-metal electrodes. Metal electrodes mainly include copper, zinc, tungsten and alloys and other related materials, but there are some problems in the actual production of metal electrodes, such as the melting point of copper electrodes is less than 1100°C, the thermal expansion coefficient is large, the loss is fast, and the material processing speed is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/532B28B3/00
CPCC04B35/522C04B35/532B28B3/003C04B2235/77C04B2235/96C04B2235/422
Inventor 吕海龙臧文平赵夕窦文鑫殷正娥李琳慈韩雪
Owner 天津锦美碳材科技发展有限公司
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