As the global mining and tunnel engineering efficiency continues to grow, the demand for efficient and durable equipment continues to grow. As the core component of rock drilling tools, shank adapter technology has ushered in a series of breakthrough innovations. Through the upgrade of material science and manufacturing process, the wear resistance, fatigue resistance and overall service life of shank adapters can be significantly improved.
1. Carburizing and surface hardening
Carburizing treatment is to place the shank in a carburizing furnace, and after a period of time, a wear-resistant hardened layer will be produced on the surface of the shank adapter and the inner wall of the water hole. After quenching and tempering, the surface will be 55-60HRC and the core will be 40-46HRC. Surface hardening is to use high-frequency induction heating quenching and tempering to get the same hardening effect, but the service life under different working conditions is different. For soft rock working conditions, surface hardening treatment can be selected, but for hard rock working conditions, carburizing treatment can be selected to improve the wear resistance and fatigue strength of the product.
2. Surface treatment for corrosion protection
With the complexity of the use conditions, the rod body is further treated on the original basis, such as blackening, chrome plating, phosphating, coating and other treatment methods. The thickness of chrome plating is about 0.05-0.1mm, and the hardness is about 800-1000HV, so that the product can be used in a humid or acidic environment, but the cost is relatively high. Blackening generates a dense oxide film on the metal surface by chemical methods, with a thickness of only 0.5-1.5μm . The surface is easy to peel off and can prevent rust in the short term. Phosphating is to form a porous crystalline film on the surface, with a thickness of 1-50 μm , which can absorb grease and has good corrosion resistance when combined with anti-rust oil, but it is brittle and easy to crack when impacted. The coating is mainly a nano coating, which has good corrosion resistance and bonding strength, but the production time is long and the drying time after spraying is long. Different surface treatments can be selected under different working conditions, considering the comprehensive cost and performance.
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