CN200963718Y

CN200963718Y - Stage-type screw tap

Info

Publication number: CN200963718Y
Application number: CN 200520131827
Authority: CN
Inventors: 秦汝奎
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-10-22
Filing date: 2005-10-22
Publication date: 2007-10-24
Anticipated expiration: 2015-10-22

Abstract

The utility model relates to a tapping device, in particular to a grade tap composed of a stem part, a sizing part and a cutting part. A square nose is designed on the upper end of the stem. The sizing part and the cutting part are designed with different grades working unit in sequence arrangement, and a plurality of grooves is designed on the peripheral side. The one with the smallest diameter is the first grade working unit. The third grade working unit with the largest diameter representing the specifications of the tap is connected to the stem. The upper end of every level working unit is the sizing part, and the lower end is the cutting part provided with a certain cone angle. Compared with the prior art, in the utility model, the quick and accurate cutting can be implemented. Through the cascade cutting and coherent operation, the cutting resistance and the heat produced are reduced, so that the amount of one-time cutting can be deceased and the work efficiency and the finished thread quality grade are improved. Therefore, the tap working is stable and the service life is long.

Description

Level formula screw tap

One, technical field:

The wood utility model relates to a kind of screw tap that utilizes the cutting form step by step of different-diameter, is a kind of grade of formula screw tap.

Two, background technology:

Current employed screw tap, though taked the branch of nose cone, plug tap etc., its Cutting Process is disposable cutting way, resistance is big, chip removal is crowded, and easily tipping often fractures, and workpiece accuracy is low, processes coarse, labour intensity is big, inefficiency, deficiency such as service life is short.

Three, summary of the invention:

In view of the problem of above-mentioned existence, the purpose of this utility model is to design a kind of screw tap that can cut step by step, compares with common screw tap, and resistance is little during its work, is difficult for tipping, long service life, crudy height, the level formula screw tap that chip removal pressure is little.

The purpose of this utility model realizes by following measure: this grade formula screw tap is mainly by shank, and sizing part, cutting tip are formed.The design of shank upper end has square toes; Sizing part, cutting tip design have the working group of different stage, arrange with order, and several trough is arranged in periphery design, the diameter minimum be first order working group, the third level working group of diameter maximum is representing the specification of screw tap, links to each other with shank, and every level work group upper end is the sizing part, the lower end is a cutting tip, and the cutting tip design has certain tapering.

Groove at above-mentioned sizing part, cutting tip can be designed to straight trough, skewed slot, helicla flute, awl flute profile formula as required.

Four, description of drawings:

Accompanying drawing: be level formula screw tap structural map.

Coding in the accompanying drawing is respectively: 1, square toes; 2, shank; 3, sizing part; 4, cutting tip; 5, groove; 6, blade; 7, first order working group; 8, second level working group; 9, third level working group.

Five, specific implementation method:

As shown in drawings: this grade formula screw tap is an independently individuality, mainly contains three parts, and shank (2) and sizing part, cutting tip (3), (4) are formed.The design of shank upper end has square toes (1); Sizing part, cutting tip design have the working group (7,8,9) of different stage, arrange with order, and several trough (5) is arranged in periphery design, the diameter minimum be first order working group (7), the third level working group (9) of diameter maximum is representing the specification of screw tap, links to each other with shank (2), and every level work group upper end is a sizing part (3), the lower end is cutting tip (4), and cutting tip (4) design has certain tapering.

The utility model course of work is as follows:

The same with regular tap tapping mode of operation, no matter be mechanism or manual tapping, there is not special requirement.First order working group (7) at first enters workpiece, deeply processing step by step, and once-forming, last reverse rotation is withdrawed from from workpiece.

The utility model compact conformation can have been accomplished to cut not only soon but also accurate, cuts link-up operation step by step, reduce the resistance of cutting edge and the heat of generation, reduced disposable cutting output, improved the grade of operating efficiency and manufactured goods thread quality, make the screw tap working stability, long service life.

Claims

1, a kind of grade of formula screw tap, it is characterized in that screw tap mainly is made up of shank (2) sizing part (3) cutting tip (4), sizing part, cutting tip design have the working group (7,8,9) of different stage, arrange with order, and several trough (5) is arranged in periphery design, the diameter minimum be first order working group (7), the third level working group (9) of diameter maximum is representing the specification of screw tap, link to each other with shank (2), every level work group upper end is a sizing part (3), the lower end is cutting tip (4), and cutting tip (4) design has certain tapering.

2, level according to claim 1 formula screw tap is characterized in that the groove (5) of sizing part, cutting tip (3,4) can being designed to straight trough, skewed slot, helicla flute, awl flute profile formula as required.