Screw tap

Abstract

The invention discloses a screw tap, which comprises a metal cutting part and a metal shank connected integrally with each other. The screw tap is in a cylindrical shape and placed transversely, and the total length of the left and right of the screw tap is 115mm. Four straight flutes are excavated from the left to the right on the cylindrical surface of the screw tap, and are evenly distributed on the cylindrical surface of the screw tap and correspondingly form four cutting-belts. The right end of each of the four straight flutes is a circular arc shape. Four cutting-belts are respectively provided with cutting-teeth by grinding, and a cutting-slot is formed between two adjacent cutting-teeth. A left pyramid is formed by grinding from the right to the left on the outer circumference of metal cutting part and in the distance of 13 mm from a left end face of the screw tap. A circle chamfering is formed by grinding from left to right to form a right pyramid on the outer circumference of metal cutting part and in the distance of 37mm from a left end face of the screw tap. A right end face of the right pyramid is connected with the metal shank. The right end of the metal shank is turned into a square head, and the four right angles of the right end face of the square head are turned into arc angle. The outer ring of the left end face of each of the four cutting-belts is provided with a blade by grinding.

Description

technical field [0001] The invention relates to a screw tap, in particular to a new type of tool used in mechanical processing and manufacturing—a new type of screw tap, which has four straight grooves. Background technique [0002] Usually, ordinary taps for processing metal materials, due to incorrect design, unreasonable structure, wrong size and other reasons, the processing technology of the taps cannot meet the requirements, the product quality is poor, not up to the grade, the use value is low, and the service life is short. , so it is necessary to carry out fine design, invention and innovation on this ordinary tap to form a new type of tap, so that its processing quality is good, the product is high-quality, the utilization rate is high, the design is correct, the structure is reasonable, and the new type of tap can work normally. , good working performance and good operation effect, so as to ensure stable work, high processing precision and long service life; overc...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome defects such as wrong design and unreasonable structure of ordinary taps, resulting in incomplete processing, poor product quality, low utilization rate, frequent chipping, blunt mouth and other defects, the invention provides a kind of tap, which is a new type of tap, With four straight grooves, correct design and reasonable structure, it can operate normally during work, the connection is firm, the working performance is good, and the running effect is good, so as to ensure stable work, high machining accuracy, sharp blade and long service life

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