CN202428006U

CN202428006U - Drill bit

Info

Publication number: CN202428006U
Application number: CN2011205374421U
Authority: CN
Inventors: 陈晓雷
Original assignee: CHANGSHU LEIWANG ALLOY TOOLS Co Ltd
Current assignee: CHANGSHU LEIWANG ALLOY TOOLS Co Ltd
Priority date: 2011-12-21
Filing date: 2011-12-21
Publication date: 2012-09-12
Anticipated expiration: 2021-12-21

Abstract

The utility model discloses a drill bit, which comprises a drill handle, a step shaft-shaped drill body, a front cutting knife blade and a back cutting knife blade, wherein the front cutting knife blade is arranged at the front end of the drill body, and the back cutting knife blade is arranged at the step part of the drill body. The drill bit disclosed by the utility model has the advantages that a plurality of cutting knife blades are adopted for replacing the original integral structure so that the stress of the knife blades can be dispersed, the knife blade cracking during the manufacture is reduced, and the rejection rate during the manufacture is effectively reduced.

Description

A kind of drill bit

Technical field

The utility model discloses a kind of drill bit, be specifically related to a kind of step drill, particularly a kind of automotive hub PCD hole drill.

Background technology

The Hyundai Motor wheel hub has carried out wheel hub large-scale production of aluminium matter and use, in aluminium matter wheel hub process, needs to use a kind of target drill to carry out the wheel hub connection and processes with bolt hole.Process the increasing substantially along with the automobile production capacity of being changed a social system the Specialty Design manufacturing by simple and easy unit-type drill head experienced in the development of this type of dedicated tool; The wheel hub manufacturing industry has also proposed requirements at the higher level to production efficiency of products and quality; Traditional wheel hub drill bit design and manufacturing process can not satisfy present instructions for use, and it is low mainly to show as working (machining) efficiency, and work piece quality and surface roughness are poor; Cutter life is low, and production line is long and poor stability of bit change post debugging time more.

Step drill can make has diameter different successive section in the boring of same operation; Say so more accurately through in boring the body tip, not only comprising one group of cutting edge; And in one or more alleged ladders, said ladder is formed on a distance at most advanced and sophisticated rear, and has the diameter bigger than the tip; Comprise the attached cutting sword, said attached cutting sword can produce the additional holes section of the diameter with continuous increase.

Traditional step drill mainly comprises cutter hub and blade, and blade comprises cutting edge and following cutting edge, is overall structure, and the scrappage of blade was higher when the step drill of this structure was made, and stress is concentrated, and is easy to crack.

The utility model content

The technical problem that the utility model mainly solves provides a kind of drill bit, can effectively reduce the scrappage of manufacturing.

For solving the problems of the technologies described above; The technical scheme that the utility model adopts is: a kind of drill bit is provided; Comprise: drillstock, the drill body that is the multidiameter shape, preceding cutting tip and back cutting tip; Cutting tip is installed on the front end of said drill body before said, and said back cutting tip is installed on the ladder place of said drill body.

In preferred embodiment of the utility model, said preceding cutting tip has two cutting edges.

In preferred embodiment of the utility model, said drill bit includes two or more backs cutting tip.

In preferred embodiment of the utility model, said drill body also comprises chip area, said from chip area in the past cutting tip begin to extend toward the drillstock direction, and through cutting tip later.

In preferred embodiment of the utility model, the big footpath Duan Weiyi point diameter of said drill body is less than the taper of rear end diameter.

The beneficial effect of the utility model is: the drill bit of the utility model, and use the multi-disc cutting tip to replace original overall structure, blade stress is dispersed, reduce and make the cracking that makes blade, effectively reduce the scrappage when making.

Description of drawings

Fig. 1 is the perspective view of the utility model drill bit one preferred embodiment;

Fig. 2 be shown in the front elevational schematic of drill bit;

The mark of each parts is following in the accompanying drawing: 1 is drillstock, and 2 is drill body, and 21 is chip area, and 3 is preceding cutting tip, and 31 is first cutting edge, and 32 is second cutting edge, and 4 is the back cutting tip.

The specific embodiment

Below in conjunction with accompanying drawing the preferred embodiment of the utility model is set forth in detail, thereby the protection domain of the utility model is made more explicit defining so that advantage of the utility model and characteristic can be easier to it will be appreciated by those skilled in the art that.

See also Fig. 1 and Fig. 2, the utility model embodiment comprises:

A kind of drill bit comprises: drillstock 1, drill body 2, preceding cutting tip 3 and back cutting tip 4.

Drill body 2 is the multidiameter shape, comprises big footpath section and path section, and the path section is positioned at the front end of drill body 2; Big footpath section is positioned at the rear end of drill body 2, and drillstock 1 is connected with big footpath, rear end section, preferably; Big footpath Duan Weiyi point diameter is less than the taper of rear end diameter, and such structure can increase the rigidity of drill bit.

Preceding cutting tip 3 is installed on the front end of drill body 2, and back cutting tip is installed on drill body 2 path sections and section ladder place that is connected, big footpath.

Drill body 2 also comprises chip area 21, and chip area 21 cutting tip 3 places in the past begins to extend toward drillstock 1 direction, and cutting tip 4 after the warp.

In the present embodiment before cutting tip 3 two cutting edges are arranged---first cutting edge 31 and second cutting edge 32, have two simultaneously after cutting tip 4, can improve stock-removing efficiency like this.Corresponding, also there are two chip areas 21 to be used for chip removal.

The drill bit of the utility model uses the multi-disc cutting tip to replace original overall structure, and blade stress is dispersed, and reduces and makes the cracking that makes blade, effectively reduces the scrappage when making.Produce the wearing and tearing of blade when using simultaneously or scrap, can according to circumstances each blade be safeguarded respectively or change, reduce maintenance cost.

The above is merely the embodiment of the utility model; Be not thus the restriction the utility model claim; Every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the utility model.

Claims

1. a drill bit is characterized in that, comprising: drillstock, the drill body that is the multidiameter shape, preceding cutting tip and back cutting tip, and said preceding cutting tip is installed on the front end of said drill body, and said back cutting tip is installed on the ladder place of said drill body.

2. drill bit according to claim 1 is characterized in that, said preceding cutting tip has two cutting edges.

3. drill bit according to claim 1 is characterized in that, said drill bit includes two or more backs cutting tip.

4. drill bit according to claim 1 is characterized in that said drill body also comprises chip area, and said chip area cutting tip place in the past begins to extend toward the drillstock direction, and cutting tip after the warp.

5. drill bit according to claim 1 is characterized in that, the big footpath Duan Weiyi point diameter of said drill body is less than the taper of rear end diameter.