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

Abstract

The invention discloses a process for manufacturing a diamond composite sheet drill bit body and the drill bit body by a hot pressing method, comprising the following steps: loading a carcass material (2) into a pre-prepared mold (3) and placing it on the reserved position of the composite sheet Graphite sheet, and then put the steel substrate (1) in the mould, heat the mold and components to a certain temperature and apply pressure, keep heat and pressure for a period of time, cool to a certain temperature to release the pressure, continue to cool and then withdraw the mold. Before heating the mold and components, it further includes putting the drill bit gauge material into the mold, so that the gauge material becomes a part of the drill body. And the diamond compact drill body made by the above-mentioned process.

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 matrix type manufacturing method, the matrix 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 advanced PDC bit body solves the 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. Carcass performance (such as hardness, wear resistance) 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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