Four-edge thread forming tap

Abstract

The invention relates to a four-edge thread forming tap which comprises a thread forming tap part, a calibration part and a handle. The calibration part is integrally disposed at the rear end of the thread forming tap part. The thread forming tap part and the calibration part are of a straight four-edge structure. The rear end of the calibration part is connected to the handle through a thin neck part. Compared with the prior art, the four-edge thread forming tap has the advantages that the four-edge thread forming tap is of the straight four-edge structure, the strength of the tap is increased while pitch diameter value accuracy of the tap is guaranteed, roughness of machined threaded holes is guaranteed while machining of blind threaded holes can be achieved, the thin neck part is equivalent to a clearance groove and suitable for machining deep hole threads, thread disorder in the threaded holes due to the fact that the tap does not have the clearance groove can be prevented, precision of the threaded holes can be guaranteed, and the machining range of the thread forming tap is increased.

Description

technical field [0001] The invention relates to a screw tap, in particular to a quadrangular extrusion screw tap. Background technique [0002] Taps are one of the most widely used thread tools for processing internal threads, especially when processing small-diameter internal threads or mass production, taps are almost always used for tapping. Taps are tapped on bottom holes that have been processed by drills or other tools, and the working conditions are very poor. It is necessary to ensure that the major diameter, middle diameter, pitch, tooth profile angle and roughness of the machined screw holes meet the specified accuracy level, and also require high productivity. Moreover, tap tapping is often the last process of the workpiece, especially tapping on large workpieces. If the tap breaks, the entire workpiece may be scrapped, causing great economic losses, so safety guarantees are required. [0003] Forming taps are taps with edges without flutes and cutting edges. U...

AI Technical Summary

Problems solved by technology

Moreover, tap tapping is often the last process of the workpiece, especially tapping on large workpieces. If the tap breaks, the entire workpiece may be scrapped, causing great economic losses, so safety guarantees are required.

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