CN201635661U

CN201635661U - Three-blade drill

Info

Publication number: CN201635661U
Application number: CN2010201524694U
Authority: CN
Inventors: 练炳方
Original assignee: Ningbo Maike Pante Electric Tool Co Ltd
Current assignee: Ningbo Maike Pante Electric Tool Co Ltd
Priority date: 2010-04-01
Filing date: 2010-04-01
Publication date: 2010-11-17
Anticipated expiration: 2020-04-01

Abstract

The utility model discloses a three-blade drill, comprising a drill handle (3), a drill rod (2) and a cutter head (1), wherein the drill rod (2) is provided with spiral junk slots (4); the cutter head (1) is provided with three cutting edges (1.1, 1.2 and 1.3) which are respectively formed by a plurality of straight cutting edges; and the number of the junk slots (4) is the same as that of the cutting edges (1.1, 1.2 and 1.3). In the utility model, the cutter head is provided with three cutting edges with the number being the same as that of the junk slots, therefore, the cutting efficiency of the cutter head with three cutting edges is higher, the drilling speed is faster accordingly; and the three junk slots are used for discharging junks, therefore, the junks are not easy to block the junk slot, and the drill head is not easy to heat or break; and the three edges are all formed by a plurality of straight cutting edges, so that the drill head is not easy to slip when in initial drilling, the positioning is easier, the resistance in cutting is reduced, the drill head is not easy to crack, and the service life is longer.

Description

Three cutting drills

Technical field:

The utility model relates to three boring cutting drills of constructional materials such as a kind of rock, concrete and granite.

Background technology:

The boring drill bits of constructional materials such as prior art rock, concrete and granite are double cutting drill, then certainly corresponding two chip areas, but speed is slower when boring, and two chip area chip removals make easily that also bits block in chip area, and cause drill bit to generate heat easily, even fracture.

The utility model content:

The utility model provides a kind of penetration rate comparatively fast to reach not susceptible to plugging three cutting drills of chip area at above problem.

The utility model overcomes the above problems used technical scheme: a kind of three cutting drills with following structure are provided, it comprises drillstock, drilling rod and cutter head, described drilling rod is provided with spiral helicine chip area, described cutter head has three cutting edges, and described three cutting edges are formed by a plurality of straight swords, and the quantity of described chip area is identical with the quantity of cutting edge.

Described three cutting edges are 110 °～140 ° along the angle of drill rod axis direction each other.

Described three cutting edges are meant by a plurality of straight swords compositions, are made up of two straight swords at an angle.

Described certain angle is meant 120 °～170 °.

After adopting above structure, the utility model compared with prior art, because cutter head has three cutting edges, the quantity of chip area is identical with the quantity of cutting edge, then the smear metal efficient of the cutter head of three cutting edges is higher, the speed of boring is just very fast naturally, and three chip areas carry out chip removal, make bits be difficult for blocking in chip area, drill bit is difficult for generating heat and drill bit easy fracture not; And three cutting edges are formed by a plurality of straight swords, make drill bit be difficult for slippage when initial bore hole, are easier to the location, and the resistance during smear metal reduces, and drill bit is difficult for bursting apart, so application life is longer.

As improvement, described chip area is circular-arc near the bottom land of cutter head part, then circular-arc bottom land can better eject the bits after the cutter head cutting, thereby the bits after the cutting of assurance cutter head can be discharged by chip area timely, prevent that bits from blocking in chip area, and cause drill bit to generate heat easily, even the generation of situation such as drill rod breaking.

Description of drawings:

Fig. 1 is the structural representation of the utility model three cutting drills.

Fig. 2 is the structure for amplifying schematic diagram of the cutter head part of the utility model three cutting drills along A direction among Fig. 1.

As shown in the figure: 1, cutter head, 1.1,1.2,1.3, cutting edge, 2, drilling rod, 3, drillstock, 4, chip area.

The specific embodiment:

Below in conjunction with the drawings and specific embodiments, the utility model is described further:

A kind of three cutting drills as depicted in figs. 1 and 2, it comprises drillstock 3, drilling rod 2 and cutter head 1, described drilling rod 2 is provided with spiral helicine chip area 4, described cutter head 1 is the cutter head of three cutting edges 1.1,1.2,1.3, and described three cutting edges 1.1,1.2,1.3 are formed by a plurality of straight swords, and the quantity of described chip area 4 is identical with the quantity of cutting edge 1.1,1.2,1.3.

Described three cutting edges 1.1,1.2,1.3 are 130 ° along the angle of drilling rod 2 axis directions each other.

Described three cutting edges 1.1,1.2,1.3 are meant by a plurality of straight swords compositions, form by two angled straight swords, described certain angle is meant 140 °, specifically be that three radially straight sword cutting edges are arranged at the center of cutter head 1, these three radially straight sword cutting edges along the circumferential direction are evenly distributed, radial limits position at these three radially straight sword cutting edges is distributed with the straight sword cutting edge of an extended line without cutter head 1 center, and the length of outer straight sword cutting edge is greater than the length near cutter head 1 central straight sword cutting edge.

Described chip area 4 is circular-arc near the bottom land of cutter head 1 part.

Above embodiment only is preferred embodiment of the present utility model, the utility model is not limited only to above embodiment and also allows other structural change, can be made up of three angled straight swords, also can be made up of and angle can be 130 °, 160 ° or 170 ° or the like four angled straight swords as: three cutting edges.

Claims

1. cutting drill, it comprises drillstock (3), drilling rod (2) and cutter head (1), described drilling rod (2) is provided with spiral helicine chip area (4), it is characterized in that: described cutter head (1) has three cutting edges (1.1,1.2,1.3), and described three cutting edges (1.1,1.2,1.3) are formed by a plurality of straight swords, and the quantity of described chip area (4) is identical with the quantity of cutting edge (1.1,1.2,1.3).

2. three cutting drills according to claim 1 is characterized in that: described three cutting edges (1.1,1.2,1.3) are 110 °～140 ° along the angle of drilling rod (2) axis direction each other.

3. three cutting drills according to claim 2 is characterized in that: described certain angle is meant 120 °～170 °.

4. three cutting drills according to claim 1 is characterized in that: described three cutting edges (1.1,1.2,1.3) are meant by a plurality of straight swords compositions, are made up of two straight swords at an angle.

5. three cutting drills according to claim 1 is characterized in that: described chip area (4) is circular-arc near the bottom land of cutter head (1) part.