Zhongtian Drill Co., Ltd.
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What are the classification and style of the drill tail?
Release time:
2024-01-12
The cross-section of the shoulder-type drill tail is hexagonal, the diameter of the inscribed circle is 22mm and 25mm, and the length is 108mm and 159mm. It is manufactured by forging process and is used for light rock drills. The lug drill tail is used for the inner rotary medium-sized guide rail type rock drill. The diameter of the drill rod is 25mm and 32mm. Spline-type drill tail is often used in heavy-duty rail-type external rotary rock drill with large torque, and the diameter of the drill rod is more than 38mm. Commonly used mechanical processing methods.
The cross-section of the shoulder-type drill tail is hexagonal, the diameter of the inscribed circle is 22mm and 25mm, and the length is 108mm and 159mm. It is manufactured by forging process and is used for light rock drills.
The lug drill tail is used for the inner rotary medium-sized guide rail type rock drill. The diameter of the drill rod is 25mm and 32mm.
Spline-type drill tail is often used in heavy-duty rail-type external rotary rock drill with large torque, and the diameter of the drill rod is more than 38mm. Commonly used mechanical processing methods.
The drill tail used in Chinese mines is mainly made of 35SiMnMoV or 24SiMnNi2CrMo steel, and the service life of the latter is significantly improved.
The drill tail has a great influence on the drilling speed, the life of the drill and the drill. Therefore, the tail of the drill shall be of appropriate length, flat and smooth end face, perpendicular to the axis, and consistent with the drill sleeve of the rock drill (the gap shall not be greater 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 if it is too hard. Generally, the hardness of the drill tail should be slightly lower than that of the piston, and the quenching hardness HRC = 38~45 is appropriate.
Special CNC machine tool processing equipment and processing process shall be used to ensure the processing quality of tail details, internal water holes and side water holes. The drill tail is uniformly heat treated and scientifically straightened using precision instruments to ensure the straightness and resistance of the drill tail.
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