Overview of Drilling Tool Product Research

Rock drilling tools have been widely used in energy mining, water conservancy and transportation construction, and infrastructure construction such as subways. With the rapid development of economy and technology, the international market demand for solder tails is increasing day by day and has put forward better requirements for product quality. Our country's drill tool product structure is unreasonable, low-end products have overcapacity, and high-end hydraulic rock drilling tools can only rely on imports. Compared with industrially developed countries such as Sweden, Britain, the United States, and Japan, domestic drill tool products are very different in terms of performance, quality, and specifications. Therefore, research on domestic material substitution and manufacturing processes for rock drilling tools has important practical application value.

Drilling tools are tools used when drilling hard rock. They are slender rod systems composed of drill bits, drill rods, connecting sleeves and drill tails that are used in conjunction with hydraulic rock drills. Drilling tools are mainly used in projects such as mining of minerals and petroleum resources, construction of bridges, tunnels, subways, water conservancy and hydropower facilities, etc. The development of drill tools has a very long process. It has gradually developed with the development of materials science and mining science and technology. The working efficiency of rock drills is getting higher and higher, and the requirements for the drill tools used with them are also becoming more and more stringent. This promotes the production of modern alloy drill steel and high-life drill tools. The development of high-quality drilling steel and drilling tools has promoted the development of high-frequency and high-power hydraulic rock drills.

With the rapid development of my country's economic construction, the mining of mineral resources, the construction of energy and transportation facilities, and the construction of subway cities are all inseparable from rock drilling tools. Especially in the construction of some key projects, the construction operations are difficult and the requirements for project quality are high, so the performance of rock drilling tools is full of challenges. Foreign industrialized countries attach great importance to the development of rock drilling tools. Over the past few decades, they have invested a lot of money in the research and development of materials and processes, and have achieved remarkable results. The development of our country's drill tool products lags far behind that of Western industrialized countries. There are many problems, such as unreasonable product structure. Most of the high-end hydraulic rock drilling equipment and supporting drill tools are imported from abroad. However, low-end products face problems in China. Due to the problem of overcapacity, the price is low, the gold content is low, and it is not competitive in the world. Compared with internationally renowned drill tool manufacturers, such as Sweden's Sandvik, Atlas Copco, Secoroc, Boart Long Year Company, Japan's Mitsubishi, Furukawa, etc., domestic drill tools still have problems in terms of performance, product quality, specifications and service life. There is a considerable gap. Therefore, for the construction of many important domestic projects, relevant departments mostly rely on imports of rock drilling machinery and supporting drilling tools to ensure construction progress and project quality. Because domestic materials are cheaper than imported materials, and many links such as transportation and customs declaration are greatly reduced, if domestic materials can be used to replace imported materials, it can bring considerable economic benefits to enterprises and engineering projects. At the same time, it saves foreign exchange for the country and has good comprehensive benefits.

In recent years, many domestic experts and scholars who study materials have conducted relevant research on my country's own drill products from different angles. In terms of heat treatment technology: After a series of heat treatment improvements, the 30Cr2Ni4MoV steel drill tail trial-produced by Huang Chang and Zhang Hongyun of Guangxi Metallurgical Research Institute of my country shows that its average service life can reach 860m/piece, which is longer than the current conventional treatment in China. The service life of the 35CrMoV steel drill tail has been increased by more than 40%, which is close to the 1000-1200m life of the Swedish Atlas company's drill tail products. my country's Shao Honghong, Jiang Xiaoyan, and Zhang Daojun selected 40CrNiMoA trial drill products and applied ultrasonic fatigue testing technology to test the performance of 40CrNiMoA steel with three different microstructure states under ultrasonic vibration load (f = 20kHz, R = -1). Fatigue performance testing analyze. The results prove that under ultrasonic vibration conditions, the ultrasonic fatigue life of microstructures with strong and tough fit is significantly improved. And at low stress levels, the fatigue life of tempered troostite is higher than that of tempered troostite. In order to improve the toughness of the drill tail, Hong Zhensheng and Yin Fucheng of Xiangtan University proposed a "composite strengthening and toughening treatment" method, that is, carburizing + high-temperature tempering + isothermal quenching + low-temperature tempering treatment. The original material of the drill tail, 22SiMnCrNi2M0A steel, The heat treatment process is improved and optimized, and the final structure obtained is lower bainite + quenched martensite + a small amount of retained austenite, thereby toughening it.

Hubei Tiantian Drilling Steel Drilling Tools Co., Ltd. and Hubei University of Technology jointly researched and showed that 23CrNi3Mo steel has good strength and toughness when oil quenched at 820~860°C, and can be used as the final heat treatment process for 23CrNi3Mo steel trial drill tools. Professor Zhao Changyou from the Institute of Metal Research, Chinese Academy of Sciences conducted a detailed experimental analysis on the performance of the domestic Si-Mn series drill tool steel 24SiMnCrNi2MoA. The low alloy ultra-high strength steel 24SiMnCrNi2MoA A, the average strength is 1400MPa, and the maximum tensile strength can reach 1540-1680MPa , and has high impact absorption energy, low notch sensitivity and good elongation.

The research conducted by these scholars on the localization of drilling tools has provided important reference and meaningful data for subsequent rock drilling tool development researchers. China's rock drilling steel drill tool industry is constantly developing. We must learn more about foreign advanced processing and manufacturing technologies and do a good job in research on imported drill tool products. And combined with the domestic application status, develop drill products with better performance and quality, conduct unremitting scientific research with the purpose of improving their competitiveness in the global market, and provide more and better products for the national economic construction of developing countries around the world. Efficient experience results.