The part of the solder of a drill tool that bears the impact and torque applied by the drill. It should have great toughness and no plastic deformation. The brazing tail can be part of the solder or can be made into a separate tail rod.
Brazing tail is mainly used in mining operations. High quality alloy steel is selected as raw material and carburized as a whole.
Commonly used brazing tail has brazing shoulder (flange) type, brazing lug (lug) type and spline type three,
Brazing shoulder type brazing tail break surface is hexagonal, inner circle diameter 22mm and 25mm, length 108mm and 159mm, using forging process manufacturing, used for light rock drill.
The drill shank is used for internal rotary medium guide rail drill, the diameter of the drill rod is 25mm and 32mm.
Spline brazing tail is often used for heavy-duty guideway rotary drill with large torque. The diameter of brazing rod is more than 38mm. Commonly used machining methods.
The brazing tail used in Chinese mines is mainly made of 35SiMnMoV or 24SiMnNi2CrMo steel, the service life of the latter is significantly improved.
Brazing tail has great influence on drilling speed, drilling machine and solder life. Therefore, the length of the drill tail should be appropriate, the end face is smooth and smooth, the section is vertical to the axis, and the drill sleeve is consistent with the drill (the gap is not more than 0.5mm). Brazing tail hardness should be appropriate, too soft brazing tail life is short, the piston is easy to be injured, general brazing tail hardness should be slightly lower than the piston hardness, quenching hardness HRC=38~45 is appropriate.
Special NUMERICAL control machine tool processing equipment and processing process should be used to ensure the tail details, internal water hole and side water hole processing quality. Brazing tail after uniform heat treatment, the use of precision instruments scientific straightening, to ensure that the brazing tail straight and anti - manic.
The process of drilling bit tail is complicated, because the bit tail is an important part, the quality of the bit tail directly affects the service life of the bit rod, so the link and method of eliminating defects should be put forward to ensure the quality of the bit tail.
The process route of drill tail is: blanking - forging - annealing or normalizing - hardness test - machining - carburizing - depth test - hardening - tempering - cleaning - hardness test - grinding. The process route of brazing tail of heavy rail drill is: blanking -- annealing or normalizing -- gas or liquid carburizing -- direct oil quenching -- high temperature tempering -- inspection -- isothermal quenching -- two times low temperature tempering -- inspection -- cold rolling -- thread cutting groove -- grinding.
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