CN2623387Y

CN2623387Y - Iso-helix angle step drill

Info

Publication number: CN2623387Y
Application number: CN 03230692
Authority: CN
Inventors: 陈尔容; 周加昆; 沈爱红
Original assignee: Jiaxing Ever Sharp Tools Co ltd
Current assignee: EST Tools Co., Ltd.
Priority date: 2003-04-26
Filing date: 2003-04-26
Publication date: 2004-07-07
Anticipated expiration: 2013-04-26

Abstract

The utility model discloses an iso-helix angle step drill, comprising a drill fixing end and a drill body, wherein, the drill body consists of a group of drill steps with different diameters which are changed in turn. The drill body is provided with a helical groove or a plurality of helical grooves, and the drill steps have the same helical angles. The helical angles and the front angles between the helical grooves and the central shaft of the drill body at all drill steps of the iso-helix angle step drill of the utility model are same, so the cutting is stable, the stability is good, the service life of the drill is prolonged and the processing efficiency is also improved.

Description

The equal helix angle step drill

Technical field the utility model relates to a kind of drill bit, especially a kind of step drill.

The background technology step drill is widely used in the hole processing in thin plate, light-wall pipe field, and it bores the pagoda shape drill bit that rank are formed by one group of different-diameter that changes according to certain rules, has another name called " high speed steel fully ground step drill ".A step drill can replace the drill bit of one group of different-diameter, different hole, one group of aperture is processed, thereby saved the more time of bit change, has improved production efficiency greatly.But because at present mostly the step drill on the domestic market is the straight trough type, the hole adds the anterior angle of respectively boring rank man-hour and differs greatly, and will cause that so respectively to bore between rank wearing and tearing inconsistent, and cutting stability is poor, and the service life of drill bit is short.

The summary of the invention technical problem to be solved in the utility model is to propose a kind of hole and adds good, the long service life of cutting stability in man-hour, equal helix angle step drill that working (machining) efficiency is high.

For solving the problems of the technologies described above, the utility model equal helix angle step drill comprises drill bit stiff end and bit body, the brill rank of the different-diameter that bit body is changed successively by one group of diameter are formed, and offer one or several helicla flute on bit body, and each helical angle of boring rank is identical.

Above-mentioned equal helix angle step drill bores the place, rank and indicates the diameter dimension number that corresponding brill rank are arranged corresponding to each on helicla flute.

After the utility model has adopted above-mentioned technical pattern, add man-hour carrying out the hole, because that each bores place, rank helicla flute is identical with helical angle between the bit body central shaft, anterior angle unanimity, so stable cutting, good stability, thereby prolonged drilling life of bit, working (machining) efficiency also is improved.After sign on the helicla flute is respectively bored the diameter dimension number on rank, can make the diameter requirement of operator according to different machining holes, shut-down operation when getting into required aperture, thus process the hole that diameter meets dimensional requirement.

Description of drawings is described in further detail the utility model below in conjunction with drawings and embodiments.

Fig. 1 is the structural representation of the utility model equal helix angle step drill.

The specific embodiment as shown in Figure 1, the equal helix angle step drill comprises drill bit stiff end 1 and bit body 2, the brill rank 3 of the different-diameter that bit body 2 is increased progressively from small to large successively by one group of diameter are formed.Offer two helicla flutes 4 on bit body 2, each pitch angle alpha will of boring rank 3 is identical.Pitch angle alpha will is meant the angle between helicla flute 4 and bit body 2 central shafts.On helicla flute 4 corresponding to each bore the diameter dimension number that 3 places, rank indicate corresponding brill rank 3 (as 20,18,16 ...).

In the utility model, the angle of pitch angle alpha will can adjust according to the requirement of the different purposes of drill bit, and the quantity of helicla flute 4 can be 1,2,3 or 4 etc., and the quantity of boring rank 3 also can change according to different situations.

Claims

1, equal helix angle step drill, comprise drill bit stiff end and bit body, the brill rank of the different-diameter that described bit body is changed successively by one group of diameter are formed, and it is characterized in that, offer one or several helicla flute on described bit body, described helical angle of respectively boring rank is identical.

2, equal helix angle step drill as claimed in claim 1 is characterized in that, indicates the diameter dimension number that corresponding brill rank are arranged corresponding to each place, described brill rank on the described helicla flute.