Sintering process of diamond compact for petroleum drill bit

A technology for diamond composite sheets and drill bits, which is used in drill bits, metal processing equipment, earth-moving drilling, etc., can solve the problems of delamination, affecting the heat resistance of products, etc., so as to improve wear resistance, shorten sintering time, and reduce the degree of wear. Effect

Inactive Publication Date: 2018-12-07
立府精密机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art diamond compact sintering process, cobalt is used as a catalyst for the conversion of diamond to graphite, which affects the heat resistance of the product; it is also prone to overall delamination

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A diamond composite sheet sintering process for an oil drill bit, comprising the following steps:

[0029] S1 raw material pre-assembly: Put the diamond powder sprayed with 0.01mm bond and the cemented carbide substrate I in the shielding cup to form an assembly, ready for use;

[0030] Primary sintering of S2 diamond composite sheet: Send the assembly in step S1 into a high-pressure sintering synthesis chamber, sinter in a high-pressure sintering synthesis chamber with a temperature of 1400°C and a pressure of 5.0GPa for 4 minutes, and remove the cemented carbide matrix I to obtain a diamond composite The crude product is ready for use;

[0031] S3 Rough finished product processing: Roughly grind the rough finished diamond composite sheet with a ceramic grinding wheel, and then finely grind it with a resin grinding wheel to make the thickness the same as the finished product, and the outer diameter is 0.2mm larger than the finished product;

[0032] Secondary sinterin...

Embodiment 2

[0039] A diamond composite sheet sintering process for an oil drill bit, comprising the following steps:

[0040] S1 raw material pre-assembly: Put the diamond powder sprayed with 0.02mm bond and the cemented carbide substrate I in the shielding cup to form an assembly, ready for use;

[0041] S2 diamond composite sheet primary sintering: Send the assembly in step S1 into a high-pressure sintering synthesis chamber, sinter in a high-pressure sintering synthesis chamber with a temperature of 1420°C and a pressure of 5.0GPa for 6 minutes, and remove the cemented carbide matrix I to obtain a diamond composite The crude product is ready for use;

[0042] S3 Rough product processing: Roughly grind the rough product of the diamond composite sheet with a ceramic grinding wheel, and then finely grind it with a resin grinding wheel to make the thickness the same as the finished product, and the outer diameter is 0.3mm larger than the finished product;

[0043] Secondary sintering of S...

Embodiment 3

[0050] A diamond composite sheet sintering process for an oil drill bit, comprising the following steps:

[0051] S1 raw material pre-assembly: Put the diamond powder sprayed with 0.02mm bond and the cemented carbide substrate I in the shielding cup to form an assembly, ready for use;

[0052] S2 diamond composite sheet primary sintering: Send the assembly in step S1 into a high-pressure sintering synthesis chamber, sinter in a high-pressure sintering synthesis chamber with a temperature of 1450°C and a pressure of 5.0GPa for 5 minutes, and remove the cemented carbide matrix I to obtain a diamond composite The crude product is ready for use;

[0053]S3 Rough product processing: Roughly grind the rough product of the diamond composite sheet with a ceramic grinding wheel, and then finely grind it with a resin grinding wheel to make the thickness the same as the finished product, and the outer diameter is 0.3mm larger than the finished product;

[0054] Secondary sintering of S4...

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Abstract

The invention relates to a sintering process of a diamond compact for a petroleum drill bit. The sintering process includes the following steps of S1, raw material pre-assembling; S2, primary sintering of the diamond compact, wherein an assembly part in S1 is fed into a high-pressure sintering synthesis chamber to be sintered in the high-pressure sintering synthesis chamber for 4-6 min, a hard alloy matrix I is removed, and a diamond compact crude finished product is obtained for use; S3, machining of the crude finished product; and S4, secondary sintering of the diamond compact, wherein a binder of the diamond compact crude finished product is removed with a strong acid soaking method, after being washed 2-3 times with clean water, the diamond compact crude finished product is dried at high temperature in a high-temperature furnace, the diamond compact crude finished product and a hard alloy matrix II are put in a shielding cup to form an assembly part, the assembly part is fed into the high-pressure sintering synthesis chamber, the assembly part is sintered for 6-8 min in the high-pressure sintering synthesis chamber with the temperature of 1,400-1,450 DEG C and the pressure of 5.6 GPa, a finished product is obtained after secondary sintering of the diamond compact, and then the finished product is machined into the required size again. The sintering process has the beneficial effects of improving the performance of the product and improving the heat resistance and the abrasion resistance of the product.

Description

technical field [0001] The invention relates to the technical field of diamond composite sheets, in particular to a sintering process of diamond composite sheets for petroleum drill bits. Background technique [0002] The diamond composite sheet is sintered with diamond micropowder and cemented carbide substrate under ultra-high pressure and high temperature conditions. It not only has the high hardness, high wear resistance and thermal conductivity of diamond, but also has the strength and impact toughness of cemented carbide. It is an ideal material for making cutting tools, drilling bits and other wear-resistant tools. [0003] Diamond composite sheet, also known as diamond and cemented carbide composite material, is sintered by 0.5-1.0mm thick diamond and a few millimeters thick WC / Co (tungsten carbide / cobalt) cemented carbide substrate under high temperature and high pressure. of. This material has the hardness and wear resistance of diamond, and has excellent impact ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/04B22F7/08B22F3/14E21B10/46B22F3/24C22C29/08B22F1/02
CPCE21B10/46C22C29/067C22C29/08B22F3/14B22F3/24B22F7/04B22F7/08B22F2003/247B22F2007/042B22F1/17
Inventor 薛中学
Owner 立府精密机械有限公司
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