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2022
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Brief Introduction of Drill Tail
The drill tail can be mainly used for mining enterprise operations, the selection of high-quality alloy steel materials as a raw material, after the whole system carburizing treatment. The commonly used drill tail has three types: the drill shoulder (flange) type, the drill lug (lug) type and the spline type.
drill tailIntroduction
The part of the rock drill bit that bears the impact and torque of the rock drill. It should have high toughness and no plastic deformation. The drill tail can be part of the drill or can be made into a separate tail rod.
1, the drill tail can be mainly used for mining enterprise operations, the selection of high-quality alloy steel materials as a raw material, after the whole system carburizing treatment. The commonly used drill tail has three types: the drill shoulder (flange) type, the drill lug (lug) type and the spline type.
The tail section is hexagonal with inner diameters of 22mm and 25mm,108mm and 159mm, respectively, and is manufactured by light stone chisel forging process.
The ear drill shank is suitable for medium-sized internal rotary guided rock drills, and the diameter of the drill shank is 25mm and 32mm respectively.
Spline drill bits are usually used for heavy-duty guided rotary rock drills with a diameter greater than 38mm. Manufactured by ordinary processing methods.
The brazing tail used in mines in China mainly uses 35SiMnMoV or 24SiMnNi2CrMo steel, and the service life of the latter is obviously extended.
2、drill tailApplication Requirements
The drill tail has a great influence on the working speed of rock drilling, the life of rock drilling machine and drill. Therefore, the length of the drill tail should be appropriate, the end face should be flat and smooth, the cross section should be perpendicular to the axis direction, and it should be consistent with the drill sleeve (the gap should not be more than 0.5mm). The hardness of the drill tail should be appropriate. If the life of the drill tail is too soft, the piston is easy to be injured. Generally, the hardness of the drill tail should be slightly lower than the surface hardness of the piston, and the quenching hardness HRC = 38~45 is appropriate. A dedicated CNC system machine tool production and processing technology equipment and processing process design process can ensure the quality of related details of the car tail, internal water hole and side water hole processing products. After relatively uniform heat treatment, the drill tail is straightened by scientific calculation using some precision measuring instruments to ensure the straightness and resistance of the drill tail.
3、drill tailMechanical processing flow
The machining process of the drill tail is more complex, because the drill tail is an important part, its quality directly affects the service life of the drill pipe, so in the preparation process should be proposed to eliminate defects and methods to ensure its quality.
The process route of rock drill pipe is generally blanking, forging, annealing or normalizing, hardness testing, machining, carburizing, carburized layer depth testing, quenching, tempering, cleaning, hardness testing and grinding. The process route of heavy rail drill pipe is: blanking, annealing or normalizing, gas or liquid carburizing, direct oil quenching, high temperature tempering, inspection, isothermal quenching, one or two low temperature tempering, inspection, cold rolling trip groove A grinding process.
The front guide sleeve of the brazing tail is made of nylon material. The nylon material replaces the steel or copper material of the traditional brazing tail front guide sleeve, which can buffer the impact during work and avoid the disadvantage that the brazing tail is broken by hard impact for a long time and needs frequent replacement. In addition, the cost of nylon material is reduced to 150 yuan/piece, which greatly reduces the cost of production operation. The existing drill tail front guide sleeve is improved, by increasing the lubrication amount by increasing the lubricating oil hole, replacing the material to reduce the hard impact of the components, with increasing the lubrication amount, preventing the drill rod from breaking, reducing the production cost, and eliminating the characteristics of safety hazards.
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