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Specializing in the production and technological advancement of rock drilling tools
Characteristics of rock drilling tools
2023-08-10
Carbon tool steel with carbon content of 0.70% ~ 1.0% is a kind of drilling steel used for shallow hole drilling at home and abroad in the early days. With low-frequency, low-impact power rock drill supporting, can still meet the needs of the drilling project. With the development of rock drills, the fatigue strength of carbon tool steel is more and more unable to meet the requirements of rock drilling. Although added 0.15% ~ 0.30% vanadium or 0.47% ~ 0.70% chromium carbon tool steel to improve the hardenability of this steel, grain refinement and toughness, but its dosage is decreasing, will eventually be replaced by alloy drilling steel.
Chinese medium and large diameter drill pipe, 35Si. MnMc, V drill steel used for drilling medium to deep rock holes, only normalized treatment, the average service life is not high. After chemical heat treatment and surface shot peening, the average drilling life can be up to 10,000 meters/root. However, in the past 10 years, a large number of foreign advanced high-frequency and high-power hydraulic drilling equipment have entered China. ;
The plasticity, cyclic toughness and fatigue strength of steel have an impact on the rolling quality. Non-metallic inclusions in steel are the source of fatigue cracks, while destroying the continuity of the matrix, resulting in stress concentration. The larger the inclusions, the more the fatigue strength decreases. Vacuum melting has a much lower content of gases and non-metallic inclusions than normal melting, and therefore its fatigue strength is much higher. Therefore, the modern hollow steel smelting using electric arc furnace smelting, vacuum degassing and furnace refining methods, as far as possible to improve the purity of steel.
The rolling quality of the raw material of the brazing tool has a great relationship with the advanced degree of rolling process and equipment. "Alloy casting method of manufacturing hollow steel is characterized by the ability to make alloy steel tubes firmly cast in the hollow ingot, rolling can make the inner surface of the hollow steel to form a layer of alloy lining pipe wall, to a certain extent, to strengthen its inner surface, thus extending the drilling life of the drill pipe. This extends the drilling life of the drill pipe. However, in the smelting process, due to the ingot shape is small, shrinkage, mixed and other metallurgical defects concentrated in the ingot surface and alloy steel pipe and the interface of the base steel. After rolling, these metallurgical defects extend into strips and lines, randomly distributed in the cross-section of the steel. When drill pipe is used for drilling, it is susceptible to cracking under mine water washout and stress stress corrosion conditions, they are prone to crack sources. Due to factors such as low drilling accuracy, core loading process and equipment, the liner pipe combines poorly with the parent material, with severe local separation. Some of them are deformed and folded, forming sharp corners, causing stress concentration and becoming a source of fatigue cracks.
The above is about rock drilling brazing tool some knowledge points, I hope you can seriously learn to understand the relevant knowledge, choose the right products and equipment for their needs, to ensure their own benefits, if you want to know more details, you can contact us, I believe that we can give you a satisfactory answer.
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