Distal end screw tap and application thereof

Abstract

The invention discloses a distal end screw tap. The distal end screw tap comprises a handle part, a neck part and a work part. A core part, a calibration part, a cutting part and a chip containing groove are machined on the work part. The cutting part is located at the most front end of the work part, and threads are machined on the calibration part and the cutting part. The number of grooves is increased for the screw tap with the specification of M8-M14, and the diameter of the core part is increased; and the point of view that the cutting thickness is accurately controlled within 0.05 mm to0.06 mm and the point of view of reducing the length of the calibration part so as to reduce cutting resistance are put forwards. By means of the distal end screw tap, the design concept that the neck part, the handle part and the chip containing groove of the screw tap are long is put forwards, the twisting off resisting capability of the screw tap is improved, clamping force is improved, and the risk that tapping is not synchronous is effectively lowered. By means of the distal end screw tap, the strength of the distal end screw tap is high, and the distal end screw tap can be used for machining quenched and tempered steel parts with the HRC being 32 or higher.

Description

technical field [0001] The invention belongs to the technical field of screw taps, in particular to a tip screw tap and its application. Background technique [0002] There are mainly two methods for machining internal threads, namely thread milling cutter circular interpolation milling and tap tapping. The thread milling cutter has a wide processing range, the same pitch thread can be processed by one cutter, and it is not limited by the workpiece material and hardness, and can process most common materials. However, the thread milling cutter has short service life, high cost, low efficiency, poor stability, and is prone to tool yielding during the milling process. The machining process requires high-frequency inspections, and the tool changing and debugging process is cumbersome, so it is not suitable for batch automatic line production. Tap is the most common tool for internal thread processing. It has the characteristics of high efficiency, stable size and simple tool c...

AI Technical Summary

Problems solved by technology

However, the thread milling cutter has short life, high cost, low efficiency and poor stability during milling, and it is easy to produce the phenomenon of tool giving. The machining process requires high-frequency inspection, and the process of tool change and debugging is cumbersome, so it is not suitable for batch automatic line production.

Tap is the most common tool for internal thread processing. It has the characteristics of high efficiency, stable size and simple tool change and debugging. It is mostly used for workpieces with a hardness of HB150-300. However, ordinary taps are prone to breakage, which will cause the entire workpiece to be scrapped, especially for For high-hardness workpieces with a hardness above HRC32, the life of the taps is low and the frequency of breakage is high, which brings a high scrap rate and uncertainty risks to the production process

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