CN201249283Y - Novel twist drill - Google Patents

Abstract

The utility model provides a novel twist drill, it is including boring the body and setting up the cutting head that has the cutting edge at boring the body front end, bore the body front end and be provided with a positioning groove, the cutting head sets up in positioning groove detachablely. Above-mentioned interchangeable head fluted drill is through the installation with the cutting head in detachable mode on the drilling body, and simple structure is reasonable, and the cutting portion is difficult to not hard up moreover, only can take off the cutting head when cutting edge wearing and tearing and change new cutting head, and easy operation has avoided the waste of material to solved the difficult problem of regrinding difficulty that exists effectively among the prior art, improved drilling efficiency, had fine practical value.

Description

A new twist drill

technical field

The utility model relates to a twist drill, in particular to a novel twist drill with a replaceable cutting edge.

Background technique

In the prior art, conventional twist drills comprise a cylindrical cutter body provided with at least one helical flute and land, wherein the flute and land follow the helix angle to the front edge. The rear end of the twist drill can be secured, for example, in the chuck of a hand tool or drill press. The cutting edge of the drill bit is generally conical with cutting edges whereby a pair of diametrically opposed cutting edges are bounded by a leading surface of the fluted land and a side of the bit forming the end face of the fluted land. The periphery of each grooved land has at its leading edge a radial protrusion, variously referred to as land, cylindrical land and support edge. The two supporting edges extend the length of the grooved land.

This commonly used twist drill, because the drill body and the drill bit are integrated, when the drill bit wears out, it needs to be re-sharpened, because some excellent drill types such as multi-edged point drills, S-shaped drills, etc. are more complicated and heavy Grinding is more difficult, and the price of regrinding is high. And because the current machining requires the use of high-performance high-speed steel, cemented carbide, etc., if the overall drill is used, it will not only increase the cost of the user, but also cause a waste of materials and money. Therefore, how to prepare a twist drill with excellent performance, firm structure and replaceable head has become a problem that people from all walks of life strive to solve.

Utility model content

The technical problem to be solved by the utility model is: to design a new type of twist drill in view of the existing problems of high price and heavy wear and tear of the twist drill, the drill only needs to replace the cutting head when the drill bit wears out, and the drill body can be repeated many times use.

The technical scheme that the utility model adopts for solving the problems of the technologies described above is:

A new type of twist drill, which includes a drill body and a cutting head with a cutting edge arranged at the front end of the drill body, the front end of the drill body is provided with a positioning groove, and the cutting head is detachably arranged in the positioning groove .

The cutting head shape corresponds to the shape of the drill body corresponding to the cutting head portion.

The positioning groove includes two side walls, a bottom surface and screw holes opened on the two side walls, and the cutting head includes two front faces, two back faces, two margins, a bottom face and cutting edges, and the two back faces and the The shapes of the two side walls are matched, the bottom surface of the cutting head matches the shape of the bottom surface of the positioning groove, and at least one hole is arranged on the cutting head, the hole corresponds to the position of the screw hole and is connected with a screw connected.

A positioning block is arranged on the bottom surface of the positioning groove, and a positioning hole matched with the positioning block is arranged on the bottom surface of the cutting head.

The shapes of the two margins are both helical.

The cutting edge can be of any shape.

The cross section of the cutting head is S-shaped.

The beneficial effects of the utility model are: the interchangeable head twist drill provided by the utility model has a simple and reasonable structure by installing the cutting head on the drill body in a detachable manner, and the cutting part is not easy to loosen, and when the cutting edge wears, only The cutting head can be removed and replaced with a new cutting head, the operation is simple, and the waste of materials is avoided, thereby effectively solving the problem of regrinding in the prior art, improving the drilling efficiency, and having good practical value.

The utility model is described in further detail below in conjunction with accompanying drawing and specific embodiment.

Description of drawings

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

Fig. 2 is a schematic diagram of the drill body structure in Fig. 1;

Fig. 3 is a schematic diagram of the structure of the cutting head in Fig. 1;

Fig. 4 is the bottom view of Fig. 3;

FIG. 5 is a front view of FIG. 3 .

Detailed ways

As shown in Figures 1 to 5, a new type of twist drill includes a drill body 2 and a cutting head 1 arranged at its front end. Detachably arranged in the positioning groove 21, the positioning groove 21 comprises two side walls 22, a bottom surface 23 and screw holes 24 opened on the two side walls 22, the cutting head 1 comprises two front faces 11, two rear faces 12 (in the figure Only one side is shown), two margins 13, a bottom surface 15 and cutting edge 16, two margins 12 are helical, the helix angle is the same as the helix angle of the drill body 2, the cutting edge 16 can be any shape, the cutting head 1 The two back faces 12 match the shape of the two side walls 22 of the positioning groove 21, the bottom surface 15 matches the shape of the bottom surface 23 of the groove 21, and the cutting head 1 is also provided with a hole 14, which is in the same position as the screw hole 24. correspond to and connect with screws (not shown in the figure).

In order to ensure the accuracy of the position of the cutting head 1 when it is installed, the bottom surface of the groove 21 is also provided with a positioning block 26, and the bottom surface of the cutting head 1 is provided with a positioning groove 17. The cooperation of the positioning block 26 and the positioning groove 17 ensures that the cutting head 1 Accuracy when installed in the groove 21 of the drill body.

In order to make the twist drill of the utility model more conducive to chip removal during work, the cross section of the cutting head 1 is selected as S-shaped, and the shape of the part corresponding to the cross section of the drill body 2 is the same.

The utility model is not limited to the above-mentioned embodiments, as long as any embodiment that can achieve the purpose of the utility model falls within the protection scope of the utility model.

Claims (6)

1. novel fluted drill, it comprises the cutting head that has cutting edge of boring body and being arranged on described brill body front end, it is characterized in that, and described brill body front end is provided with a location groove, and described cutting head is arranged in this detent removably.

2. novel fluted drill according to claim 1 is characterized in that: described cutting head shape is corresponding with the shape of the part of the corresponding described cutting head of described brill body.

3. novel fluted drill according to claim 2, it is characterized in that: described detent comprises two side, bottom surface and drives screw hole on the two side, described cutting head comprises two fronts, two back, two lands, a bottom surface and cutting edge, described two back and described two side shape are complementary, the bottom surface of described detent and the bottom shape of described cutting head match, also be provided with at least one hole on the described cutting head, this hole is corresponding with described screw hole position and be connected with screw.

4. novel fluted drill according to claim 3 is characterized in that: the bottom surface of described detent is provided with a positioning block, and the bottom surface of described cutting head is provided with a locating slot that matches with described locating piece.

5. novel fluted drill according to claim 3 is characterized in that: described two-edged belt shape is spirality.

6. according to the arbitrary described novel fluted drill of claim 1 to 5, it is characterized in that: the cross section of described cutting head is the S type.

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