Importance of shank adapter
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The shoulder-type shank adapter has a hexagonal cross-section, with an inscribed circle diameter of 22mm and 25mm, and a length of 108mm and 159mm. It is manufactured by forging technology and is used for light rock drills.
The drill shank adapter is used for the inner-rotating medium-sized guide rail type rock drill, and the drill rod diameter is 25mm and 32mm.
Spline shank is often used for heavy-duty rail-type external rotary rock drills with larger torque, and the drill rod diameter is more than 38mm. Commonly used machining methods are manufactured.
The shank tail has a great influence on the rock drilling speed, rock drill and drill life. Therefore, the shank tail should be of appropriate length, flat and smooth end face, vertical to the axis, and consistent with the drill sleeve of the rock drill (the gap should not be greater than 0.5mm). The hardness of the shank should be appropriate. If the shank is too soft, the life of the shank will be short, and if it is too hard, the piston will be easily injured. Generally, the hardness of the shank should be slightly lower than that of the piston, and the quenching hardness HRC=38~45 is appropriate.
The processing flow of the drill shank of the rock drill is relatively complicated. Since the shank is an important part, its quality directly affects the service life of the drill rod. Therefore, when preparing the process, the links and methods for eliminating defects should be proposed to ensure its quality.
