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At the time of purchase (except for non-detecting equipment, no slotted tap) can be easily detected (M6 is an example):
1; Look at the taper groove front end thread shovel grinding (chamfering) is uniform, whether the cutting groove knife edge has a fast mouth, good is a positive 7-shaped, bad inverted 7 or U-shaped (when exiting the wire attack will cause twice Cutting, easy to break and affect the accuracy of the thread);
2; detection of heat treatment: the drawing cone is parabolic in the air (about 5 meters) whether it is broken under the flat drop, and the break indicates that the brittleness is large;
3; Break the tap, see that the fracture is obliquely long, and the molecular particles (metallographic structure 10.5#) in the fracture are fine, indicating that the heat treatment and the material are good, flat or oblique, molecular particles (metallographic structure) Thick is not good.
The quality of the tap depends mainly on its original material, heat treatment, groove shape, precision, equipment, speed and material to be processed, hardness, quality of the operating staff, etc., and more! When selecting the tap, pay special attention to the original material of the tap, heat treatment and groove type. For different processing holes, it is recommended to select different types of taps!
There are many taps on the market. Because of the different materials used, the price of the same specification is also quite different, so that the purchaser looks like a fog, I don’t know which one to buy. Here are a few simple ways to teach you: