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The method and process of manufacturing diamond segment by preloading calcining hot pressing process
Publish Date:2020-03-11
The method of manufacturing diamond nodule by pre pressing calcining hot pressing process is to put the molding material (including working layer and non working layer) into the mold cavity, first cold press with a certain pressure (1000-2000kg / cm2), then take out the mold and send it to the furnace for heating, when the temperature reaches the specified sintering temperature, it will be kept for 1-2h, then take out the mold and send it to the press to be pressurized to the specified size, and cool it to room temperature for mold unloading. Diamond Boart, an international famous Belgian company, makes diamond nuggets in this way.In the process of prepressing calcining hot pressing, the mould is mainly made of heat-resistant steel, high-strength cast iron and other materials, because the mould should not only bear high cold pressing pressure, but also bear high temperature sintering and hot pressing. The following table lists the commonly used hot pressing die materials in China.
The process of pre pressing and hot pressing sintering is to press the blank with manual or automatic cold press. The thickness of the blank has reached the size requirements (refers to the vertical pressed segment), and the height direction remains to be pressed. Put the blank into the graphite mold and send it to the hot press, and then electrify it for heating. The temperature of the graphite mold will soon reach the sintering temperature. At this time, apply full pressure (i.e. the specified pressing pressure). After pressure relief, transfer the mold to the steel plate with good thermal conductivity. When the temperature is close to room temperature, remove the mold and take out the segments.
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segments
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