Tool bit blank and synthetic process thereof and synthetic mold thereof and tool bit production method

Abstract

The invention discloses a tool bit blank and synthetic process thereof and a synthetic mold thereof and a tool bit production method. The tool bit blank comprises a sleeve body made of a hard alloy material and a column body made of a glomerocryst superhard material. The column body is located in the sleeve body and sintered and fixed on an inner circumferential face of the sleeve body. The tool bit blank is formed by a set of processes which are filling (a green body is obtained)-pressure maintaining sintering (the tool bit blank is obtained). The green body is composed of the sleeve body and glomerocryst superhard material particles or powder filled in the sleeve body. In the process that the green body is sintered to the tool bit blank, pressure maintaining sealing is just conducted to opening positions at two ends of the sleeve body, so that the effect of maintaining pressure on the glomerocryst superhard material particles or powder in the sleeve body can be achieved. In the process of pressure maintaining sintering, compared with the prior art, dependence on a mold container shape in the sintering process is reduced, production process of the tool bit blank and a tool bit is simplified, production effect is facilitated and production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of cutting tools, in particular to a cutter head blank, and also relates to a synthesis process of the cutter head blank, a special synthesis mold for the synthesis process, and a production method of the cutter head using the above-mentioned cutter head blank. Background technique [0002] At present, the commercially available cutter head has two forms: integral polycrystalline cubic boron nitride cutter head and composite polycrystalline cubic boron nitride cutter head. Although the integral polycrystalline cubic boron nitride cutter head is simple to prepare, it is Because the cutter head is made of polycrystalline cubic boron nitride material as a whole, the manufacturing cost is relatively high. The composite polycrystalline cubic boron nitride cutter head only contains a small amount of polycrystalline cubic boron nitride material, and the rest is relatively cheap hard alloy, so the composite polycrys...

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Problems solved by technology

[0008] However, when using this synthesis process to synthesize the composite cutter head, in the sintering process of step 4, the ultra-high pressure generating device maintains the pressure on the green body through the mold container to ensure the compactness and layer thickness of the sintered body layer. As a result, higher requirements are placed on the mold cavity precision of the mold container during the synthesis process, and the thickness of the polycrystalline superhard material powder filled in the mold container needs to be controlled, which results in the high cost of the mold container used during synthesis and the high cost of synthesis. It is difficult to add materials in the process, so that the synthesis process is complicated and the processing cost of the composite cutter head is relatively high.

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