COPYRIGHT STATEMENT
《The article "Requirements and Expectations for the Use of Cemented Carbide for Mining in the Drilling Tool Industry" was written by Hu Ming, Deputy Secretary-General of China Drilling Tools Association during the 2021 China (Shanghai) Tungsten Raw Material Industry Development High-end Forum. Special report made at the third council of the fourth session of the alloy branch. All rights such as copyright and copyright in this article belong to Mr. Hu Ming, and the use of part or all of the content in any form must be approved by Mr. Hu Ming.
Here we sincerely thank Secretary-General Hu Ming for his great contributions to China’s brazing steel and drilling tools industry for a long time, and thank Secretary-General Hu Ming for authorizing us to publish on WeChat of "China Tungsten Online" and the website of China Tungsten Association. I believe it will be approved. In this article, China's brazing steel and carbide industry will have more mutual understanding and exchanges, and will produce more innovation and cooperation!
Sincerely thank Mr. Hu Ming.
CTIA GROUP
2021.10.21
CONTENTS
1. Overview of China's brazing steel and drilling tools industry
2. Working principle of mining cemented carbide products in rock drilling tools
3. Overview of the use of mineral alloys in drilling tools
4. The main failure modes of mining alloys in the use of drilling tools
5. Expectations for the future development of cemented carbide for mining
BRIEF INTRODUCTION
As a material with excellent comprehensive performance, mining cemented carbide is widely used in rock drill bits and is a tool for breaking rocks directly. At the same time, mining alloys are also one of the products with short service life and large consumption in the field of cemented carbide products. From the perspective of drill tool manufacturers, we hope that mining alloys have high hardness and good toughness, so that impact resistance and wear resistance are in the best state, but it is difficult to achieve the best of both worlds. It is expected that through the continuous research of cemented carbide production enterprises on the alloy tungsten carbide and cobalt content, and the grain size, the use performance of mining cemented carbide will become higher and higher.
Among all the cemented carbides for mining, the percussion drill bit has the most stringent requirements for the performance of the alloy teeth. Among the alloy teeth used in impact drill bits, the requirements on the side teeth of the drill bit are the most stringent. The edge alloy teeth are distributed around the drill bit at an inclination angle of 35-45 degrees, which not only breaks the rock, but also resists rock grinding, protects the steel body of the drill bit from being worn by the rock and causes early failure, and at the same time withstands a large angle of tipping Torque, so the hardness and toughness requirements of alloy teeth are very high. Manufacturers of drilling tools have also been hoping to have an alloy tooth with high shell hardness and good core toughness.
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