Drilling and milling screw tap

Abstract

The invention aims to provide a drilling and milling screw tap. By the aid of the drilling and milling screw tap, the quality of products can be improved while the internal thread machining work efficiency is effectively improved. The drilling and milling screw tap comprises a shank and an edge portion. The edge portion is mounted at an end of the shank. The drilling and milling screw tap is characterized in that the edge portion comprises a spiral hole drilling edge, a side edge and a platy cutting edge, the spiral hole drilling edge is arranged at an end of the edge portion, the side edge with threads is close to the shank, and the platy cutting edge is arranged between the hole drilling edge and the side edge and is parallel to the axis of the edge portion. The drilling and milling screw tap has the advantages that when internal threads are machined, the hole drilling edge is in contact with a workpiece at first, holes can be drilled in the workpiece, then the inner walls of the holes are finely machined by the cutting edge and become smooth, the rear-end side edge with the threads is in contact with the workpiece ultimately, the threads can be milled in the drilled holes, accordingly, tool changing can be omitted in integral work procedures, the coaxiality can be guaranteed in hole drilling procedures and thread milling procedures, and the machining efficiency and the machining quality can be improved.

Description

technical field [0001] The invention belongs to the technical field of cutter manufacturing, and in particular relates to a drilling and milling tap. Background technique [0002] The traditional internal thread processing method is to use a suitable drill to process the thread bottom hole first, and the hole needs to be chamfered, and finally use a milling cutter to mill the thread. The disadvantage is that the process is scattered, and the required machine tools and processes are more , The number of times to replace the drill bit and milling cutter is frequent, not only the productivity is low, but also the coaxiality of the drill bit and the milling cutter is difficult to guarantee after the tool change, which affects the product quality and causes a lot of inconvenience in production. [0003] Now there is a drilling and milling tap whose blade has both a drilling edge and a threading edge, which can be tapped immediately after drilling without changing the drill bit, t...

AI Technical Summary

Problems solved by technology

[0002] The traditional internal thread processing method is to use a suitable drill to process the thread bottom hole first, and the hole needs to be chamfered, and finally use a milling cutter to mill the thread. The disadvantage is that the process is scattered, and the required machine tools and processes are more , frequent replacement of drills and milling cutters, not only low productivity, but also difficult to guarantee the coaxiality of drills and milling cutters after tool change, affecting product quality and causing a lot of inconvenience in production

[0003] Now there is a drilling and milling tap whose blade has both a drilling edge and a threading edge, which can be tapped immediately after drilling without changing the drill bit, thus improving work efficiency, but because the inner surface of the hole is relatively rough after drilling , so it is difficult to guarantee the quality of tapping when tapping

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