Tapping machines are widely used in drilling and tapping of porous parts in the mechanical industry. Automatic equipment reduces labor intensity. But sometimes the workpiece will be scrapped due to the breakage of the tap during the use of the tapping machine. Therefore, how to prevent the tapping machine from breaking the tap becomes an inevitable problem.
First, the use of tapping machine
(1) to adjust the tapping machine speed to the lowest speed. Tapping at a lower speed can be operated better and it is not easy to destroy the tap.
(2) When tapping, the left hand rests on the spindle and the right hand holds the forward and reverse handles. When tapping, the left hand applies force to strengthen the tapping force. After tapping, the left hand only needs to hold the handle. When the workpiece is near completion, start to reverse the handle, so it is not easy to damage the tap.
(3) Tapping speed should also be selected according to different materials. For example, high speed can be selected for copper and low speed for steel. In addition, materials with strong hardness should be cooled by tapping oil. When the drill bit is stuck, it can be reversed and then rotated forward. Stop the equipment when the temperature of the drill bit is too high to prevent the equipment tap from breaking.
Second, the tapping machine failure reason
(1) The tap wears, the cutting edge is passivated, and the tapping torque is constantly increasing. To a certain extent, if the tap is not withdrawn in time, the tap will break.
(2) During tapping, chips block the tap, and the additional tapping torque increases sharply. If chips cannot be further discharged, the tap will not reverse and withdraw, and the tap will break due to excessive torque.
(3) The hardness of the workpiece material is uneven, and hard grains appear locally. When the tap meets, the torque increases. If the tapping torque exceeds a certain value, the tap needs to be reversed to exit, otherwise the tap is broken. Under normal circumstances, the tap can break through this part of material to continue tapping.
(4) The tapping torque is larger than normal due to the mistake of tapping technology, which leads to the abrasion and fracture of tap.
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