CN203592177U - Conical step drill - Google Patents

Abstract

The utility model discloses a conical step drill. The conical step drill comprises a head part, a conical body and a handle part. The head part is of a cylinder shape, two axial grooves which are symmetrical are formed in the head part, and axial cutting edges which are the same in cutting track are arranged at openings of the two axial grooves respectively. The front end of the body is connected with the head part, the peripheral wall of the body is of a stepped shape, and the outer diameter of body gradually decreases from back to front. Four to six spiral grooves are evenly distributed in the body, all the spiral grooves start from the rear end of the body and spirally extend to the front end of the body, spiral cutting edges which are the same in cutting track are arranged on openings of all the spiral grooves respectively, and the spiral cutting edges of every two spiral grooves are connected with one axial cutting edge of the head. The handle part is of a cylinder shape and is connected with the rear end of the body. The conical step drill is simple in structure, convenient to use, stable in operation, high in cutting efficiency, and good in heat dissipation effect.

Description

Taper subland drill

Technical field

The utility model belongs to drill bit field, relates in particular to a kind of taper subland drill.

Background technology

Drill bit is to go out through hole or blind hole in order to drilling on solid material, and can be to the cutter of existing hole reaming.

Symmetrically on traditional drill bit be designed with two cutting slots, distribution of weight inequality, concentricity is low, easily shake, and cutting edge is less when work, and stock-removing efficiency is low, and meanwhile, the rubbing surface between drill bit and machining hole is large, and heat-dissipating space is little, causes poor heat radiation.

Utility model content

Based on this, for above-mentioned technical problem, provide a kind of taper subland drill.

For solving the problems of the technologies described above, the utility model adopts following technical scheme:

A kind of taper subland drill, comprising:

Head, described head is column, which is provided with two axial grooves that are arranged symmetrically with, and the notch of described two axial grooves all has the axial cutting edge that Cutting trajectory is identical;

The main body of taper, the front end of described main body is connected with head, the perisporium of this main body is stepped, and its external diameter is reduced to front gradually by rear, in described main body, be evenly distributed with 4-6 helicla flute, each helicla flute all starts from the rear end of described main body and is spirally extended to the front end of described main body, all has the spirality cutting edge that Cutting trajectory is identical on described spiral fluted notch, and wherein two spiral fluted spirality cutting edges are connected with an axial cutting edge of described head respectively;

Shank, described shank is column, and it is connected with the rear end of described main body.

The radial section of described shank is regular hexagon.

The middle part of described shank has a ring annular groove.

The utility model is simple in structure, easy to use, compared with the drill bit that only there are two cutting slots with tradition, 4-6 spiral fluted design makes drill bit concentricity in the time of work high, and each helicla flute all has spirality cutting edge, improved the stock-removing efficiency of drill bit, meanwhile, 4-6 helicla flute reduced the rubbing surface between main body and machining hole, also increase, good heat dissipation effect have been obtained for the helicla flute dispelling the heat.

Accompanying drawing explanation

Be elaborated below in conjunction with the drawings and specific embodiments the utility model:

Fig. 1 is structural representation of the present utility model;

Fig. 2 is internal structure schematic diagram of the present utility model.

The specific embodiment

As shown in Figure 1 and Figure 2, a kind of taper subland drill, comprises head 110, main body 120 and shank 130.

Head 110 is column, which is provided with two axial grooves that are arranged symmetrically with, and the notch of two axial grooves all has the axial cutting edge that Cutting trajectory is identical, is clockwise Cutting trajectory or counterclockwise Cutting trajectory.

Main body 120 is tapered, and front end is connected with head 110, and the perisporium of main body 120 is stepped, and its external diameter is reduced to front gradually by rear.

In main body 120, be evenly distributed with 4-6 helicla flute 121; each helicla flute 121 all starts from the rear end of main body 120 and is spirally extended to the front end of main body 120; on the notch of helicla flute 121, all there is the spirality cutting edge 121a that Cutting trajectory is identical, be clockwise Cutting trajectory or counterclockwise Cutting trajectory.

Compared with the drill bit that only there are two cutting slots with tradition, the design of 4-6 helicla flute 121 makes drill bit concentricity in the time of work high, jitter phenomenon while having avoided work, job stability is high, and each helicla flute 121 all has spirality cutting edge 121a, has improved the stock-removing efficiency of drill bit, simultaneously, 4-6 helicla flute 121 reduced the rubbing surface between main body 120 and machining hole, also obtained increase, good heat dissipation effect for the helicla flute 121 dispelling the heat.

Wherein the spirality cutting edge 121a of two helicla flutes 121 is connected with an axial cutting edge of head 110 respectively.

Shank 130 is column, and it is connected with the rear end of main body 120, for being connected with cutting driving mechanism.

Particularly, the radial section of shank 130 is regular hexagon.

Be understandable that, for cutting driving mechanism stable connection, the middle part of shank 130 has a ring annular groove 131.

But, those of ordinary skill in the art will be appreciated that, above embodiment is only for the utility model is described, and be not used as restriction of the present utility model, as long as within the scope of connotation of the present utility model, variation, modification to the above embodiment all will drop within the scope of claims of the present utility model.

Claims (3)

1. a taper subland drill, is characterized in that, comprising:

Head, described head is column, which is provided with two axial grooves that are arranged symmetrically with, and the notch of described two axial grooves all has the axial cutting edge that Cutting trajectory is identical;

The main body of taper, the front end of described main body is connected with head, the perisporium of this main body is stepped, and its external diameter is reduced to front gradually by rear, in described main body, be evenly distributed with 4-6 helicla flute, each helicla flute all starts from the rear end of described main body and is spirally extended to the front end of described main body, all has the spirality cutting edge that Cutting trajectory is identical on described spiral fluted notch, and wherein two spiral fluted spirality cutting edges are connected with an axial cutting edge of described head respectively;

Shank, described shank is column, and it is connected with the rear end of described main body.

2. a kind of taper subland drill according to claim 1, is characterized in that, the radial section of described shank is regular hexagon.

3. a kind of taper subland drill according to claim 1 and 2, is characterized in that, the middle part of described shank has a ring annular groove.

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