CN201350534Y

CN201350534Y - Trapezoidal thread tap adopting stepped cutting

Info

Publication number: CN201350534Y
Application number: CNU2009200676945U
Authority: CN
Inventors: 陆正官; 周洪祥; 倪亚华; 刘安平
Original assignee: SHENLI THREND TOOL CO Ltd SHANGHAI
Current assignee: SHENLI THREND TOOL CO Ltd SHANGHAI
Priority date: 2009-02-13
Filing date: 2009-02-13
Publication date: 2009-11-25
Anticipated expiration: 2019-02-13

Abstract

The utility model discloses a trapezoidal thread tap adopting stepped cutting, which comprises a conical handle, a square head, a chip flute structure and a sequential integrated structure composed of first tap, second tap and conical handle; the tooth roots of the first tap cutting teeth are the same with the tooth roots of the second tap cutting teeth; the tooth angle of the first tap cutting teeth is 50 degrees and the tooth angle of the second tap cutting teeth is 30 degrees. As the first tap and the second tap cutting teeth are designed to have different tooth angles, the stepped cutting is realized, the cutting load is reduced by 40% and the tap is not easy to be broken, the operating part of tap has low abrasion so that the service life of tap is relatively improved by 50%; meanwhile, as coarse and fine machining are performed, the tapped surface is highly polished and the first tap is integrated with the second tap, the thread accuracy is relatively high and the material is saved by 50%.

Description

A kind of tap for trapezoidal thread of stepped cut

One, technical field:

The tap for trapezoidal thread of a kind of stepped cut of the utility model, what relate to is threading tool design and manufacturing technology field, is applied to trapezoidal thread.

Two, background technology:

At present, disclosed industry standard JB/T9989.1-1999 tap for trapezoidal thread is because the profile of tooth of the cutting teeth of the tap for trapezoidal thread of first tap, second tap split is identical, with the tap for trapezoidal thread tapping time, cutting load is big, attacked outside the face fineness difference, the work of screw tap is serious wear partly, continues to use, cutting load is bigger, screw tap fractures easily, causes service life short, very uneconomical.

Three, summary of the invention:

The purpose of this utility model is to overcome above-mentioned defective, and the tap for trapezoidal thread of existing standard is advanced, design a kind of first tap, second tap disjunctor, the cutting teeth of first tap, second tap different angles is realized stepped cut, alleviates the tap for trapezoidal thread of a kind of stepped cut of cutting load.Its technology is achieved in that the structure that comprises taper shank, square toes, chip pocket, it is characterized in that: the structure of first tap, second tap, taper shank order disjunctor, the tooth root of first tap cutting teeth, second tap cutting teeth is identical, and the profile angle of first tap cutting teeth is that the profile angle of 50 ° of second tap cutting teeths is 30 °.The obvious advantage of implementing after this technology is: because first tap, second tap are designed to the different angles cutting teeth, can realize stepped cut, cutting load reduces 40%, and screw tap is frangibility not, and the work of screw tap is is partly worn and torn little, prolonged the service life 50% of screw tap relatively, while, the face of being attacked was highly polished owing to implement thick, fine finishining, again owing to first tap, second tap disjunctor, the precision of screw thread is higher relatively, economical with materials 50%.

Four, description of drawings:

Fig. 1 is a structural representation of the present utility model;

Wherein, 1-square toes, 2-taper shank, 3-second tap, 3-1-second tap cutting teeth, 4-first tap, 4-1-first tap cutting teeth, 5-chip pocket, 6-first tap cutting cone, 7-second tap cutting cone;

Four, the specific embodiment:

Below in conjunction with accompanying drawing the utility model is further described:

See accompanying drawing 1, press first tap (4), second tap (3), taper shank (2) order disjunctor; The termination of taper shank (2) is provided with square toes (1), article four, chip pocket (5) connects first tap (4) and second tap (3), the tooth root of first tap cutting teeth (4-1), second tap cutting teeth (3-1) is identical, the profile angle of first tap cutting teeth (4-1) is that 50 °, the profile angle of second tap cutting teeth (3-1) are 30 °, and the leading section of first tap (4) and second tap (3) is provided with first tap cutting cone (6) and second tap cutting cone (7) respectively.

See accompanying drawing 1, general processing technology according to screw tap, through forging material, turning roughing profile, mill square toes (1), rough mill four chip pockets (5), rough turn first tap cutting teeth (4-1) and second tap cutting teeth (3-1) are afterwards, heat-treat, screw tap is heated to 1250 ℃ ± 10 and heat-treats, hardness reaches RC63-66, carry out thick again, correct grinding first tap cutting teeth (4-1) and second tap cutting teeth (3-1) external diameter, slightly, correct grinding chip pocket (5) and taper shank (2), correct grinding first tap cutting teeth (4-1), second tap cutting teeth (3-1), first tap cutting cone (6) and second tap cutting cone (7) are through check, the packing warehouse-in.

A kind of tap for trapezoidal thread of stepped cut is during to the through hole tapping, the hinge hand is buckled on the square toes (1), the first tap cutting cone (6) of first tap (4) enters in the screwed hole, the first tap cutting teeth of setting (4-1), second tap cutting teeth (3-1) tooth root identical, the profile angle of first tap cutting teeth (4-1) is that the profile angle of 50 ° of second tap cutting teeths (3-1) is 30 °, be used to carry out stepped cut, first tap cutting teeth (4-1) begins to carry out the tapping of trapezoidal thread, after having attacked first tap (4), the second tap cutting cone (7) of second tap in succession (3) enters in the teeth groove of the trapezoidal thread that first tap (4) cuts out, carry out second tap (3) cutting again, attacked until trapezoidal thread, take out screw tap, finish the tapping of trapezoidal thread.

Claims

1. the tap for trapezoidal thread of a stepped cut, comprise taper shank (2), square toes (1), chip pocket (5), the structure of first tap (4) and second tap (3), it is characterized in that: the structure of first tap (4), second tap (3), taper shank (2) order disjunctor, the tooth root of first tap cutting teeth (4-1), second tap cutting teeth (3-1) is identical, and the profile angle of first tap cutting teeth (4-1) is that the profile angle of 50 ° of second tap cutting teeths (3-1) is 30 °.