Process for preparing diamond geological coring bit

Abstract

The invention discloses a process for preparing a diamond geological coring bit. The process comprises the following steps: (1) filling a water gap material in a mold, and filling a mixture of diamond and powder; (2) filling welding layer powder; (3) inserting a working steel body; (4) putting into a resistor sintering furnace, making the working steel body wait to be sintered and vertically pressed, and ensuring that the resistor area is 1 / 3 of the whole mold area; (5) heating, and applying pressure which is 1 / 3 of the total pressure 12-18MPa when the temperature is raised to 720-780DEG C; (6) applying the total pressure 12-18MPa when the temperature is raised to 850-1,000DEG C, and keeping the temperature and the pressure for 2 to 5 minutes, wherein the temperature rise speed is 100-200DEG C / min; (7) stopping heating and cooling; and (8) stopping applying pressure when the temperature is reduced to 680-720DEG C, taking out of the furnace, and cooling. The diamond geological coring bit prepared by the process has the average life of 30-70 meters and the ageing of 2-5 meters, and effectively resolves conflicts between efficiency and service life in geological drilling.

Description

technical field [0001] The invention relates to a diamond geological core drill bit, in particular to a preparation process of a diamond geological core drill bit used for drilling pebble gravel formations or hard, brittle, broken formations or broken formations. Background technique [0002] Pebble and gravel formations, hard, brittle and broken formations are difficult problems in the field of drilling. When drilling in pebble and gravel formations, mud protection walls are often used, while conventional diamond drills have small diamond edges, small annular gaps between the drill bit and the drill hole, small nozzle and water tank areas, and the drill bit is easy to burn. The steel body of the drill bit Easily worn through. When the conventional alloy drill bit is drilling, the alloy is very easy to break when working at the bottom of the hole. Therefore, the general drill bit has low efficiency, short life and high cost when drilling in such formations. At present, the...

AI Technical Summary

Problems solved by technology

When the conventional alloy drill bit is drilling, the alloy is very easy to break when working at the bottom of the hole, so the general drill bit has low efficiency, short life and high cost when drilling in such formations.

At present, there are two main methods of producing diamond bits in China: electroplating method and integral sintering method. The diamond bit produced by electroplating method has a long service life but low efficiency; the sintering method generally adopts the overall sintering method of intermediate frequency furnace, which has the advantage of high efficiency, but The disadvantage is that the pressing density is not high, resulting in short service life

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