CN103990869A

CN103990869A - Large length-diameter-ratio screw tap for titanium alloy piece tapping

Info

Publication number: CN103990869A
Application number: CN201410263551.7A
Authority: CN
Inventors: 刘智昂; 申庆援; 刘如刚; 吴家任
Original assignee: Aerospace Precision Products Co Ltd
Current assignee: Aerospace Precision Products Co Ltd
Priority date: 2014-06-12
Filing date: 2014-06-12
Publication date: 2014-08-20
Anticipated expiration: 2034-06-12
Also published as: CN103990869B

Abstract

The invention provides a large length-diameter-ratio screw tap for titanium alloy piece tapping. The large length-diameter-ratio screw tap comprises a cutting screw tap body, a calibration part and a handle part. The calibration part comprises a correction unit and a solidification unit. A cutting face of the correction unit and a cutting face of the solidification unit respectively comprise a relief angle transition part and a relief angle part. The cutting screw tap body is five threads long. The correction unit is 13 threads long. The solidification unit is 3 threads long. A relief angle of a cutting face of the cutting screw tap body is machined to be 4-5 degrees. The length of the relief angle transition part of the cutting face of the correction unit is 0.2 mm, and a relief angle of the relief angle transition part of the cutting face of the cutting face is 0 degree. A relief angle of the cutting face of the correction unit is machined to be 4-5 degrees. The length of the relief angle transition part of the cutting face of the solidification unit is 1 mm, and a relief angle of the relief angle transition part of the cutting face of the solidification unit is 0 degrees. A relief angle of the relief angle part of the cutting face of the solidification unit is machined to be 9-10 degrees. By means of the design scheme, generated friction and torsion borne by the screw tap in the tapping process can be reduced sufficiently, so that the tapping difficulty is reduced, the successful rate of tapping is increased, machining efficiency and tapping quality are improved, and the service life of the screw tap is prolonged.

Description

Big L/D ratio titanium alloy part screw tap for tapping

Technical field

The invention belongs to tapping tool, especially relates to a kind of big L/D ratio titanium alloy part screw tap for tapping.

Background technology

Self-plugging rivet is to be mainly used in the titanium alloy material rivet that composite material face one side is fixedly connected with, its bottom outlet length and bottom diameter ratio is large (> 4), and the development of self-plugging rivet is played very important effect at aspects such as weaponry, the research and production of national defence type, civil aviations.The problems such as in the development process of self-plugging rivet, while adopting traditional screw tap to titanium alloy rivet nut tapping internal thread, because aperture ratio is larger, tapping difficulty is large, exists screw tap short service life, and thread quality is poor, logical only defective, and working (machining) efficiency is low.

Summary of the invention

The big L/D ratio titanium alloy part screw tap for tapping of the problems such as for the problems referred to above, it is short service life that the invention provides one effectively to solve screw tap, and thread quality is poor, logical only defective, and working (machining) efficiency is low.It comprises cutting cone, calibration portion, shank, cutting cone and calibration portion are mainly made up of sword face, sword face be positioned at a series of taking equidistant point on screw tap central axis on the center of circle and the disc perpendicular to screw tap central axis, cutting cone length is 5 teeth, the relief angle of cutting cone sword face is made 4 °～5 °.

Calibration portion comprises amending unit and solidified cell, amending unit length is 13 teeth, solidified cell length is 3 teeth, the sword face of amending unit and solidified cell comprises relief angle transition portion and rear angle part, and amending unit sword metafacial angle transition portion length is 0.2mm, and relief angle is 0 °, the relief angle of amending unit sword metafacial angle part is made 4 °～5 °, the relief angle transition portion length of solidified cell sword face is 1mm, and relief angle is 0 °, and the relief angle of solidified cell sword metafacial angle part is made 9 °～10 °.

On cutting cone, be shaped with three uniform oblique chip pockets, respectively with in calibration portion vertically uniform three straight chip flutes be connected, tiltedly chip pocket center line becomes 10 ° of angles with straight chip flute center line.

The anterior angle of cutting cone, amending unit and solidified cell sword face is all made 10 °.

This big L/D ratio titanium alloy part screw tap for tapping advantage is: the torsion that the frictional force producing while reducing tapping fully and screw tap are subject to, reduce tapping difficulty, and improve tapping success rate, improve working (machining) efficiency and thread quality, improve the service life of screw tap.

Brief description of the drawings

Fig. 1 is the overall schematic of the invention;

Fig. 2 is the invention cutting cone and calibration portion schematic diagram;

Fig. 3 is the A-A tangent plane schematic diagram of Fig. 1;

Fig. 4 is the B-B tangent plane schematic diagram of Fig. 1;

Fig. 5 is the C-C tangent plane schematic diagram of Fig. 1;

In figure: 1. cutting cone, 2. amending unit, 3. solidified cell, 4. shank, 5. tiltedly chip pocket, 6. straight chip flute, 7. relief angle, 8. relief angle transition portion, 9. anterior angle, 10. calibration portion, 11. sword faces, 12. rear angle parts

Detailed description of the invention

Below in conjunction with accompanying drawing, the specific embodiment of the invention is elaborated.

Big L/D ratio titanium alloy part screw tap for tapping, comprise cutting cone, calibration portion, shank, cutting cone 1 and calibration portion are mainly made up of sword face, sword face be positioned at a series of taking equidistant point on screw tap central axis on the center of circle and the disc perpendicular to screw tap central axis, cutting cone length is 5 teeth, calibration portion comprises amending unit and solidified cell, amending unit length is 13 teeth, put in place for being threaded form of thread processing, solidified cell length is 3 teeth, for the screw thread of processed moulding is done to last curing molding, compared with regular tap, shorter correction portion length, the frictional force producing can fully reduce tapping time, reduce to a great extent the difficulty of tapping, improve the success rate of tapping.

The relief angle of cutting cone sword face is made 4 °～5 °; The sword face of amending unit and solidified cell comprises relief angle transition portion and rear angle part, amending unit sword metafacial angle transition portion length is 0.2mm, relief angle is 0 °, the relief angle of amending unit sword metafacial angle part is made 4 °～5 °, the relief angle transition portion length of solidified cell sword face is 1mm, relief angle is 0 °, the relief angle of solidified cell sword metafacial angle part is made 9 °～10 °, this design has reduced the torsion that tapping process plug tap is subject to fully, increase its durability, also can ensure well the correction of screw thread, improve thread quality.

On cutting cone, be shaped with three uniform oblique chip pockets, respectively with in calibration portion vertically uniform three straight chip flutes be connected, tiltedly chip pocket center line becomes 10 ° of angles with straight chip flute center line, while making tapping chip removal easier, the advantage such as simultaneously also have that torsion is little, stable accuracy, durability are strong

Above the invention embodiment is had been described in detail, but described content is only for the preferred embodiment of the invention, can not be considered to the practical range for limiting the invention.All equalization variation and improvement etc. of doing according to the invention application range, within all should still belonging to the patent covering scope of the invention.

Claims

1. a big L/D ratio titanium alloy part screw tap for tapping, comprise cutting cone (1), calibration portion (10), shank (4), cutting cone (1) and calibration portion (10) are mainly made up of sword face (11), sword face (11) be positioned at a series of taking equidistant point on screw tap central axis on the center of circle and the disc perpendicular to screw tap central axis, cutting cone (1) length is 5 teeth, it is characterized in that: calibration portion (10) comprises amending unit (2) and solidified cell (3), amending unit (2) length is 13 teeth, solidified cell (2) length is 3 teeth, the sword face (11) of amending unit (2) and solidified cell (3) comprises relief angle transition portion (8) and rear angle part (12),

The relief angle (7) of the upper sword face (11) of cutting cone (1) is made 4 °～5 °;

Relief angle transition portion (8) length of the upper sword face (11) of amending unit (2) is 0.2mm, relief angle (7) is 0 °, and the relief angle (7) of the rear angle part (12) of the upper sword face (11) of amending unit (2) is made 4 °～5 °;

Relief angle transition portion (8) length of the upper sword face (11) of solidified cell (3) is 1mm, relief angle (7) is 0 °, and the relief angle (7) of the rear angle part (12) of the upper sword face (11) of solidified cell (3) is made 9 °～10 °.

2. big L/D ratio titanium alloy part screw tap for tapping according to claim 1, is characterized in that: the anterior angle (9) of the upper sword face (11) of cutting cone (1), amending unit (2) and solidified cell (3) is all made 10 °.

3. big L/D ratio titanium alloy part screw tap for tapping according to claim 1 and 2, it is characterized in that: on cutting cone (1), be shaped with three uniform oblique chip pockets (5), respectively with in calibration portion (10) vertically uniform three straight chip flutes (6) be connected, tiltedly chip pocket (6) longitudinal centre line becomes 10 ° of angles with straight chip flute (6) longitudinal centre line.