Design and manufacture of taps: 1, choose good material taps. Add special alloying elements in ordinary high-speed tool steel, can significantly improve the wear resistance and toughness tap. 2, a reasonable choice tool heat treatment methods to tap both hardness and toughness. 3, increase the tap before the appropriate angle. It should be noted that, as the tap before the angle is too large knife in the back is likely to cause chipping and tap-tapping the threads polygonal.

Flange is a kind of disc parts, are the most common in the pipeline engineering, the flange is used in pairs. In pipeline engineering, the flange is mainly used for pipe connection. In need of connecting pipes and all kinds of installation of a flange, the low pressure pipe flange can use silk, the use of more than 4 kg pressure welding flange. Between two slices of flange and gasket, then use bolts. Different stress of flange bolts with different thickness and use different. When water pump and valve, and pipe connection, the local equipment, also made the corresponding flange shape, also known as flange connection. Where there are two surfaces in the surrounding use of bolt connection closed connection parts at the same time, generally referred to as the "flange", such as ventilation pipe connections, this kind of parts can be called "flange parts". But this connection is only a partial equipment, such as flange connection and water pumps, not good called the pump flange parts ". Relatively small, such as valve can call "flange parts".

Due to the high viscosity of the material stainless steel stamping elbow, poor chip breaking performance, the use of stainless steel stamping elbow tap tapping process prone to chip scratch the workpiece thread or tap chipping phenomenon, affecting the processing efficiency and thread quality. In order to extend tap life, improve quality of thread processing, should pay attention to the following points.
Design and manufacture of the tap:
1, choose good material taps. Add special alloying elements in ordinary high-speed tool steel, can significantly improve the wear resistance and toughness tap.
2, a reasonable choice tool heat treatment methods to tap both hardness and toughness.
3, increase the tap before the appropriate angle. It should be noted that, as the tap before the angle is too large knife in the back is likely to cause chipping and tap-tapping the threads polygonal.
4, the tap thread coated titanium nitride coating, can significantly improve the tap wear resistance, heat resistance and lubricity.
5, appropriate to increase the amount of tap shovel back. It should be noted that, as the shovel back too large knife in the back corner prone to the phenomenon within the chip into the rear tap and tapping out the thread finish poorly.