Technology for making diamond composite sheet drill bit body by hot press method and drill bit body

Abstract

A technology for manufacturing the drill bit body containing composite diamond sheet by hot pressing method includes filling raw material in a mould in such manner that the graphite sheet is arranged at the position where the composite diamond sheet is stayed, loading basic steel body in the mould, putting the diameter holding material in the mould, heating, pressing, holding the temp and pressure for a certain time, cooling, releasing pressure, cooling, and demoulding.

Description

(1) Technical field [0001] The invention discloses a process for manufacturing a drill body, in particular a new process for manufacturing a diamond composite sheet drill body and the drill body manufactured by the process. (2) Background technology [0002] Diamond compact (referred to as PDC) drill bits are widely used in petroleum exploration, geological exploration, water conservancy and hydropower construction, road and bridge construction, mining engineering and other fields. PDC is a composite body composed of polycrystalline diamond layer and cemented carbide substrate, which has extremely high hardness, wear resistance and toughness of cemented carbide. The PDC bit is manufactured by brazing the PDC and the PDC bit body together. The quality and performance of the drill bit are not only related to the quality of the PDC itself, but also directly related to the quality, performance and accuracy of the PDC bit body. [0003] There are currently two types of manufact...

AI Technical Summary

Problems solved by technology

The disadvantages of this process method are: 1. Poor gauge performance of the drill bit; 2. Low machining accuracy; 3. PDC is easy to desolder; 4. The life of the drill bit is low; 5. It cannot adapt to complex formation construction, etc.

In the carcass type manufacturing method, the carcass powder material forming the drill body is first added to the pre-prepared graphite mold, then the steel is assembled and solder is sent to the sintering furnace for heating, and the drill body is sintered to form the drill body. Although the obtained PDC bit body solves the existing defects of the steel body type PDC bit body, it still has its own shortcomings: 1. High manufacturing cost; 2. Long processing cycle; 3. Large mold consumption; 4. Matrix Properties (such as hardness, wear resistance) are difficult to adjust

However, in this method, one requires the use of high-pressure equipment, and the other requires the presence of a protective gas to carry out, and its preparation process conditions are relatively harsh.

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