Workpiece clamping is likely to be another factor problem. Tapping on the stainless steel parts, should ensure that the workpiece clamping rigid loading, prevent the workpiece vibration. The key factors of the screw size and quality also affect the processing. Standard thread 2B path height is 65% 83.3%. maximum height (100%) thread is a perfect triangle thread. 65%, the amount of material removed to less than 83.3% of the thread, and the amount of material removed tap is less, the torque required is smaller, the tap life is longer.
The workpiece material cold hardening will shorten the life of tap. In order to minimize cold hardening, should adopt the appropriate drill, and the feed rate and cutting speed appropriate to the drilling hole.
Tap the geometry and the coating is also very important. Tapping the blind hole, should use large spiral slot taps with positive rake angle of the cutting edge, to increase the shear angle, improve chip performance. Processing high hardness stainless steel, it needs to use usually can significantly improve the performance of tapping with high strength cutting edge and a small spiral angle tap.TiN or TiCN coating.
There is no problem of tapping chip extrusion, but requires tapping torque, more so, the use of cooling liquid effectively. Extrusion tapping, cutting cone tooth number should be less than the standard cone bottom. Use the plunger type tap may make the workpiece material serious cold hardening.
Thread milling is an alternative processing workshop can be considered. This process can control the cutting speed and feed rate, and can prevent thread tearing. However, the processing speed of thread milling than tapping slowly, may cause the production bottleneck. In addition, but also by the thread cutter length to diameter ratio limit, screw depth should not normally be more than 2 times the diameter.
Stainless steel tapping quality requirements continue to improve, not only the use of suitable taps, but also need to choose the right processing parameters.