CN205020900U

CN205020900U - Interior cold ladder spiral bit

Info

Publication number: CN205020900U
Application number: CN201520676120.3U
Authority: CN
Inventors: 李朱松; 陈兰贞
Original assignee: Hangzhou Denglong Numerical Technology Co Ltd
Current assignee: Hangzhou Denglong Numerical Technology Co Ltd
Priority date: 2015-09-02
Filing date: 2015-09-02
Publication date: 2016-02-10
Anticipated expiration: 2025-09-02

Abstract

The utility model provides an interior cold ladder spiral bit, can splice single drill bit including at least two together, it says along its length direction's spiral cutting edge to be equipped with the odd number on single drill bit, form the chip groove or the back of a knife blade between two adjacent spiral cutting edges, chip groove and back of a knife blade interval arrangement, the groove face of chip groove is the arc surface of inside concave yield, the surface of the back of a knife blade is outside convex arc surface, the front end of drill bit has the drill tip, the part that the spiral cutting edge extended to the drill tip forms the chisel edge, the recess has between the adjacent chisel edge, form the drill tip cutting face between chisel edge and the recess, form the chisel edge angle between chisel edge and the chip groove, form the chamfered edge relief angle between adjacent brill spare cutting face and the spiral cutting edge, the drill bit is equipped with the cascaded surface equidistantly on its length direction, have the ladder relief angle between the cascaded surface and the back of a knife blade, cold hole in being equipped with on the cascaded surface. The utility model discloses prevent that cutting temperature is too high, the difficult cutting process of hiding considers to be worth doing, has saved the cost of drill bit.

Description

Interior cold step drill head

Technical field

The utility model relates to cutting element.

Background technology

Fluted drill is the cutting element by completing drilling process around the rotation of fixed axis, current machining, usual needs first adopt other tool processes to go out locating hole on workpiece, and then adopt fluted drill to process, for this situation, in prior art, have employed the problem that a kind of staged fluted drill solves spiral bit enlarged-diameter in processing, but along with the increase of fluted drill processing length, the magnitude of recruitment of cooling fluid does not catch up with, and chip removal effect is also bad.In addition, same fluted drill can only attack a hole, and if certain angle of fluted drill has been worn and torn, whole drill bit has all cancelled.

Summary of the invention

Technical problem to be solved in the utility model be to provide a kind of in cold step drill head, staged feed can be realized, simultaneously can partly more bit change.

The technical scheme that the utility model technical solution problem adopts is: interior cold step drill head, described drill bit comprises at least two single drill bits that can be stitched together, described single drill bit is provided with odd number road spiral-shaped blade along its length, chip area or the knife back is formed between described adjacent two spiral-shaped blades, described chip area and the described knife back are spaced, the groove face of described chip area is the arc surface be inwardly recessed, the outer surface of the described knife back is outwardly arc surface, the front end of described drill bit has apex point, the part that described spiral-shaped blade extends to apex point forms chisel edge, between described adjacent chisel edge, there is groove, apex point cutting face is formed between described chisel edge and described groove, chisel edge angle is formed between described chisel edge and described chip area, chamfered edge relief angle is formed between described adjacent diamond piece cutting face and described spiral-shaped blade, described drill bit is provided with cascaded surface in their length direction equally spacedly, has ladder relief angle between described cascaded surface and the described knife back, and described cascaded surface is provided with interior cold hole.

While employing technique scheme, the utility model can also adopt or combine and adopt following further technical scheme:

The front end face of described drill bit is provided with interior cold hole, and described interior cold hole is arranged at the middle part of described groove.

The helicoid of described adjacent single drill bit is mutually adaptive, thus is stitched together by multiple single drill bit.

The length of described chisel edge is 0.03-0.05 times of described bit diameter.

Described chamfered edge relief angle is 5-8 °.

Described ladder relief angle is 7 ° ± (0.05-0.25) °.

The beneficial effects of the utility model are: interior cold step drill head of the present utility model is being provided with ladder machining blade while, cascaded surface is provided with interior cold hole, cooling fluid can be contacted with workpiece to be machined more fully in process, prevent cutting temperature too high, chip area of the present utility model adopts circular arc groove face, compared with prismatic groove of the prior art, be not easy hiding machining bits, the problem of drainage difficulty can not be caused; In addition, because spiral bit of the present utility model adopts multiple single drill bit to be spliced, after the wearing and tearing of certain position, can partly change single drill bit, and do not need whole drill bit all to replace, save the cost of drill bit, extend the service life of drill bit to a certain extent.

Accompanying drawing explanation

Fig. 1 is overall structure figure of the present utility model.

Fig. 2 is the end view of Fig. 1.

Fig. 3 is stepped portion schematic diagram of the present utility model.

Fig. 4 is the schematic diagram of drill bit of the present utility model splicing.

Detailed description of the invention

With reference to accompanying drawing.

Interior cold step drill head of the present utility model comprises at least two single drill bits 1 that can be stitched together, but drill bit is provided with odd number road spiral-shaped blade 2 along its length, chip area 3 or the knife back 4 is formed between adjacent two spiral-shaped blades 2, chip area 3 and the knife back 4 are spaced, the groove face of chip area 3 is the arc surface be inwardly recessed, the outer surface of the knife back 4 is outwardly arc surface, the front end of drill bit has apex point 5, the part that spiral-shaped blade 2 extends to apex point forms chisel edge 6, between adjacent chisel edge 6, there is groove 7, apex point cutting face is formed between chisel edge 6 and groove 7, chisel edge angle ω is formed between chisel edge 6 and chip area 3, chamfered edge relief angle α is formed between adjacent apex point cutting face and spiral-shaped blade 2, drill bit is provided with cascaded surface 9 in their length direction equally spacedly, there is between cascaded surface 9 and the knife back 4 ladder relief angle α ', cascaded surface 9 is provided with interior cold hole 8.

The front end face of drill bit is provided with interior cold hole 8, and interior cold hole 8 is arranged at the middle part of groove 7.

The helicoid of adjacent single drill bit is mutually adaptive, thus formation interior cold step drill of the present utility model that multiple adjacent single drill bit is stitched together.

In order to the convenience of machining, the length of chisel edge 6 be the 0.03-0.05 of bit diameter doubly, described chamfered edge relief angle α is 5-8 °, and ladder relief angle α ' is 7 ° ± (0.05-0.25) °.

Claims

1. cold step drill head in, it is characterized in that: described drill bit comprises at least two single drill bits that can be stitched together, described single drill bit is provided with odd number road spiral-shaped blade along its length, chip area or the knife back is formed between described adjacent two spiral-shaped blades, described chip area and the described knife back are spaced, the groove face of described chip area is the arc surface be inwardly recessed, the outer surface of the described knife back is outwardly arc surface, the front end of described drill bit has apex point, the part that described spiral-shaped blade extends to apex point forms chisel edge, between described adjacent chisel edge, there is groove, apex point cutting face is formed between described chisel edge and described groove, chisel edge angle is formed between described chisel edge and described chip area, chamfered edge relief angle is formed between described adjacent diamond piece cutting face and described spiral-shaped blade, described drill bit is provided with cascaded surface in their length direction equally spacedly, has ladder relief angle between described cascaded surface and the described knife back, and described cascaded surface is provided with interior cold hole.

2. interior cold step drill head as claimed in claim 1, is characterized in that: the front end face of described drill bit is provided with interior cold hole, and described interior cold hole is arranged at the middle part of described groove.

3. interior cold step drill head as claimed in claim 1 or 2, is characterized in that: the helicoid of described adjacent single drill bit is mutually adaptive, thus is stitched together by multiple single drill bit.

4. interior cold step drill head as claimed in claim 1, is characterized in that: the length of described chisel edge is 0.03-0.05 times of described bit diameter.

5. interior cold step drill head as claimed in claim 1, is characterized in that: described chamfered edge relief angle is 5-8 °.

6. cold step drill head in as claimed in claim 1, is characterized in that: described ladder relief angle is 7 ° ± (0.05-0.25) °.