Introduction
Rock drills, also called pneumatic drills, are a type of machinery used to drill into rock or hard surfaces. Rock drills are powered by compressed air and contain a hollow steel tube that is inserted into a rock or hard surface to create a hole. These drills are commonly used in the mining and construction industries, where the drills are used for a variety of purposes, including drilling for oil and gas, boreholes for underground plumbing, or for blasting. They can also be used for excavating pits or trenches.
The hollow steel tube used in a rock drill is known as the drill rod. This rod is designed with a number of characteristics to enhance the performance of the drill. These features include the type of steel used, the size and strength of the tube, the hardness and flexibility, and the shape of the tip. The type of steel used to construct the tube must be strong enough to withstand the force of the compressed air and hard enough to penetrate the rock or hard surface.
GB/T1301-1994
In China, the designation for the hollow steel used to construct drill rods is GB/T1301-1994. This designation is given the type of steel used to construct the rod. The steel used to produce the drill rod must be a medium carbon steel with a certain minimum strength, toughness and hardness. It should also exhibit good ductility and forming properties.
The minimum strength required for a steel to be considered for use in a drill rod is 900 MPa. The steel should also have a minimum hardness of 190 HV. The steel should have a minimum bending test of at least 50 mm. It should also possess good forming and machining properties.
Steel Characteristics
The steel must also possess certain specific characteristics in order for it to be suitable for use in a drill rod. It must be very hard and corrosion resistant. It should have good fatigue resistance and should be able to resist shock and vibration. It should also be able to resist wear and abrasion and should have good ductility.
Manufacturing Process
The drill rods are manufactured by cold drawing on steel rods. This process is done in order to reduce the size of the rods and to improve the hardness and strength of the steel. The rods are then heat treated in a heat treating oven and quenched in oil or brine. After this process the rods are ready for use in the rock drills.
Conclusion
Rock drills are a valuable and essential tool in the mining and construction industries and require steel that is strong and hard enough to penetrate the rock or hard surfaces. The steel used for the manufacture of the drill rods must meet certain standards and possess certain properties in order to perform its function adequately. The standard designation for the steel used to construct drill rods in China is GB/T1301-1994. This designation refers to the type of steel used, the minimum strength, hardness, and flexibility required and the shape of the tip. The drill rods are then manufactured in a cold drawing process and heat treated to improve their strength and hardness. The end result is a strong and durable rod that is capable of penetrating rock or hard surfaces.
