Tapping machine is a kind of machine tool that uses taps to process internal threads. It is the most widely used machine tool for processing internal threads. Because the tapping machine taps work in different working conditions, some taps wear and tear first to increase the torque and break occasionally, resulting in the scrap processing of the workpiece to stop. Sometimes even those workpieces have been processed for a long time in the various processes of machining or even finishing, due to tapping process tap breakage and lead to a large number of waste workpiece scrap. The following is a brief introduction to the solutions for common failures of tapping machines.
(1) Because the cutting edge of the tap is blunted by wear, the tapping torque increases continuously to a certain extent, and if the tap is not withdrawn in time, the tap will break.
(2) In the process of tapping, the additional tapping torque of the scrap plugging tap increases sharply. If the scrap can not be further discharged without reversing the tap, the tap will break because of the excessive torque.
(3) Hard particles appear in the uneven hardness part of the workpiece material. If the tapping torque exceeds a certain value when the tap meets, the tap must be reversed and withdrawn or the tap will break. Under normal circumstances, the tap can break through this part of the material and continue to tap.
(4) tapping can not meet the technological requirements. Using non-special oils such as machine oil and vegetable oil as cutting oil, the processed products are prone to burr and other adverse conditions, and the tap life will be greatly reduced.
(5) the speed of feeding is too fast to cause too much torque. It is suggested that the speed of tapping machine should not be too fast when machining threads with ordinary taps.
(6) the bottom hole diameter does not match the tap. When tapping, the necessary parts of the tap need to be increased, thus breaking the tap. It is suggested that the correct bottom hole diameter should be selected according to the type of tap and the material of the tap. If there is no fully conformable bit, the larger one can be selected.
(7) improper operation. When the tap is about to touch the bottom of the hole, it still feeds at the tapping speed before it reaches the bottom of the hole, or forcibly feeds when the chip is not well discharged, resulting in the tap breaking.
(8) concentricity is not enough. At the beginning of tapping, the starting position of the tap is incorrect, that is, the axis of the tap is not aligned with the center line of the bottom hole, and the torque is too large during tapping, which is the main reason for the tap breaking.
(9) improper steps of tapping. When tapping high hardness parts or deep holes, step tapping should be done to avoid one stroke.
Above is the solution of common faults of tapping machine. Under the condition of ensuring product process, product material and processing equipment, the key to ensure product quality is the positioning of workpiece, the control of tapping speed and the method of operation flow. Yida Borun Petrochemical Company is the largest manufacturer of high-end metal processing oil in China. The tapping oil series developed independently is made of lard sulfide and fatty acid sulfide ester as the main agent. It has excellent extreme pressure and anti-wear properties. It can effectively protect taps, improve surface finish of workpieces and greatly improve processing efficiency. In practice, customers at home and abroad have won favorable comments.
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