The traditional method of processing the parts shown in Fig. 1 is to first machine the T-shaped thread (TL) and then make the φ hole to obtain the incomplete nut in the figure. The disadvantages of the above method are as follows: 1 material waste is large. 2 After the thread is cut out, a large number of flash burrs appear after reaming, and the cleaning is very laborious. 3 more steps to expand the φ hole, labor and time.
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