CN2686778Y

CN2686778Y - Composite tap

Info

Publication number: CN2686778Y
Application number: CN 200420021308
Authority: CN
Inventors: 陆正官
Original assignee: SHENLI THREND TOOL CO Ltd SHANGHAI
Current assignee: SHENLI THREND TOOL CO Ltd SHANGHAI
Priority date: 2004-03-26
Filing date: 2004-03-26
Publication date: 2005-03-23
Anticipated expiration: 2014-03-26

Abstract

The utility model discloses a composite tap which is an integrated structure in the sequence of a drill bit in the front end, a tap in the middle, counter bits in the neck and rear part and a positioning slot arranged in the middle of the handle, with the drill bit, the tap, the counter bits and the positioning slot being integrative. Drilling, tapping, and chamfering can be done at one time, so 1/3 of the processing time is saved. Compared with the drill bits and the taps of conventional technique, 50% of the steel resources is saved, and the machining accuracy of the internal thread is improved. Each technical index of the composite tap reaches the national standard of GB/969-94, with the tolerance grade being higher than the tolerance grade of the national standard.

Description

Compound screw tap

One, technical field:

A kind of compound screw tap of the utility model, what relate to is threading tool design and manufacturing technology field, is applied to process GB, U.S. mark, moral mark internal thread.

Two, background technology:

Usually attack internal thread with screw tap, will get out bottom outlet with drill bit earlier, carry out chamfering again, use screw tap tapping internal thread then instead, like this, need just can finish through the above operation in three roads, not only time-consuming, effort, and directly influenced machining accuracy.

Three, summary of the invention:

The purpose of the compound screw tap of the utility model is to improve technology, designs a kind of compound screw tap, once finishes boring, chamfering, tapping.Its technology is achieved in that the structure that comprises drill bit, screw tap, neck, counterbit, locating slot, shank, it is characterized in that: by front end is that drill bit, middle part are screw taps, neck, rear portion are the orders that is provided with locating slot in the middle of counterbit, the shank, the overall structure of drill bit, screw tap, neck, counterbit, shank consubstantiality, the screw thread that is provided with can be in the scope of M2 ~ M14.The positive effect of implementing after this technology is: once finish boring, tapping, chamfering, save process time more than 1/3, compare the drill bit and the screw tap of common process, save steel resources 50%, improved the machining accuracy of internal thread, every technical indicator all reaches national GB/969-94 standard, and the grade of tolerance is higher than national standard.

Four, description of drawings:

Fig. 1 is the structural representation of facing of the compound screw tap of the utility model;

Wherein: 1-drill bit, 2-screw tap, 3-neck, 4-counterbit, 5-locating slot, 6-shank;

Five, the specific embodiment:

Below the production with the compound screw tap of M6 is further described the utility model:

See accompanying drawing 1, it is that drill bit (1), middle part are screw tap (2) by front end, and neck (3), rear portion are the consubstantiality overall structures that is provided with the order of locating slot (5) in the middle of counterbit (5), the shank (6).Its production is: select for use Φ 8 high-speed steel to carry out fracture, get length 68MM, an end drill centers makes drill bit (1) Φ 5 through Vehicle Processing.2, screw tap (2) position reaches Φ 6.4MM。Shank (6) is Φ 7.5, and car goes out neck (3) and 90 ° of counterbit (4) inclined-planes and locating slot (5), shank (6) mill out hexagonal, after heat-treat and reach HRC62 ~ 65, the blank after the heat treatment carries out sandblast; Carry out centre bore again and grind, finish grind each position cylindrical, helicla flute, counterbit (4) and M6 silk tooth, go out cutting edge to grinding a tooth part grinding, grinding drill (1) reaches Φ 4.9, drift angle is 118 °, and the shank of the compound screw tap through being up to the standards (6) franking is through cleaning, oil, pack, warehouse-in.

Claims

1. the compound screw tap of the utility model, the structure that comprises drill bit (1), screw tap (2), neck (3), counterbit (4), locating slot (5), shank (6), it is characterized in that: by front end is that drill bit (1), middle part are screw tap (2), neck (3), rear portion are the orders of counterbit (4), shank (6), the overall structure of drill bit (1), screw tap (2), neck (3), counterbit (4), shank (6) consubstantiality.

2. according to the described compound screw tap of claim 1, it is characterized in that: the screw tap that is provided with (2) can be in the scope of M2 ~ M14.