CN2150031Y

CN2150031Y - Hollow drill-bit

Info

Publication number: CN2150031Y
Application number: CN 93209368
Authority: CN
Inventors: 张仕明
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-04-16
Filing date: 1993-04-16
Publication date: 1993-12-22
Anticipated expiration: 2003-04-16

Abstract

The utility model relates to a hollow drill bit which mainly comprises a cutter body part, a cutter head part, a cutter handle and a chip removal member by wind power; the cutter head part is composed of saw teeth; the chip removal member by wind power is arranged on the air inlet port of the cutter body part. In the drilling process, the integral hollow drill-bit rotates; the saw teeth in the cutter head part cuts; the chip removal member by wind power collects the wind power and input the wind power into the cutter body through the air inlet port to blow the cut chip away. The utility model has simple structure and high processing speed and efficiency, and can avoid the dead point of the cutting motion of a solid drill bit.

Description

Hollow drill-bit

The utility model relates to a kind of hollow boring bit, used drill bit when locating to hole especially for building aspect such as metope, cement face, brick face etc.

Present employed drill bit, especially the head cusp of spiral bit is the dead point in the working angles, this cusp does not have cutting movement, corresponding to be cut material be by the axial compression effect of drill bit and be cut the torsional interaction of material on every side and be cut with this position, thereby cutting the time usually needs bigger axial jacking power, and when the drilling open-work, fluted drill will all machine away hole core all material, and like this, the cutting output of working angles is big, need expend more electric energy, efficient is also lower, because fluted drill is solid, needs material more during manufacturing, it is also inconvenient that weight, the drill bit of this form are got rid of the dirt bits.

The purpose of this utility model is exactly the deficiency that overcomes prior art, proposes a kind of stock-removing efficiency height, gets rid of dirt and considers hollow boring bit easily to be worth doing.

The purpose of this utility model realizes by following content, hollow boring bit of the present utility model mainly comprises the cutter head part, the blade part, shank portion and wind-force chip removal member, cutter head part and blade partly are hollow steel pipes, cutter head is made of sawtooth, described sawtooth from its hollow steel pipe end face along steel shaft to protruding, blade part one end partly is connected with cutter head, and the other end is connected with handle of a knife, blade partly is provided with the air intake aperture, wind-force chip removal member is arranged on the place, air intake aperture of blade part, and described wind-force chip removal member is a kind of concavity blade, and it is surrounded by half in the air intake aperture of blade part according to the drill bit direction of rotation, shank portion is to adopt general conventional shape, so that can be positioned over the drill bit interface of rig.The number of teeth of above-mentioned sawtooth generally is that 3 multiple is advisable, and tooth depth is 2～80mm, and the set air intake aperture of blade part is generally 2～8, and is with the setting of steel pipe radial symmetric, and wind-force chip removal member can be welded on the blade part.In drilling process, drill bit integral body rotates, the sawtooth of cutter head part cuts, wind-force chip removal member is then collected wind and wind is input into steel duct by the air intake aperture on the blade part, its inside distinguished and admirable to serrated portion to blow away the chip that sawtooth downcuts, behind the saturating wallboard of bit drills, promptly formed hole and cylinder bits, smear metal at this moment finishes.

Advantage of the present utility model is to have eliminated the cutting movement dead point, has reduced cutting output, has improved process velocity and efficient, gets rid of the dirt bits easily, because drill bit is hollow, has then saved raw material greatly.

Further describe structure of the present utility model below in conjunction with accompanying drawing, wherein:

Fig. 1 is a hollow boring bit schematic diagram of the present utility model;

Fig. 2 is the cutaway view of its hollow boring bit wind-force chip removal member;

Fig. 3 is a kind of embodiment of cutter head part sawtooth;

Fig. 4 is the part vertical view of Fig. 3;

Fig. 5 is the another kind of embodiment of cutter head part sawtooth;

Fig. 6 is the vertical view of Fig. 5;

Fig. 7 is the front view of a sawtooth among Fig. 5;

Fig. 8 is the side view of Fig. 7.

As shown in Figure 1,1 is the cutter head part, and 2 is the blade part, and 3 is shank portion, and 4 is wind-force chip removal member.Cutter head part 1 and blade part 2 are hollow steel pipes, cutter head part 2 is made of sawtooth 5, as shown in Figure 3, described sawtooth 5 from the hollow steel pipe end face along steel shaft to protruding, sawtooth 5 is to be provided with like this, and the smear metal knife face 6 of sawtooth 5 becomes β angle (as shown) with crown end face line I, and the β angle is generally 30～75 °, and another flank of tooth of sawtooth 5 (non-cutting edge face) becomes α angle (as shown) with the line II, and α is 0～45 °.Transition arc γ between two teeth is 2～50mm, and wherein sawtooth 5 compartment of terrains are outwards with inside

A low-angle is promptly outside teeth directional

A low-angle (as shown in Figure 4) in a low-angle, another adjacent teeth directional.Fig. 2 is the cutaway view of wind-force chip removal member 4, this wind-force chip removal member 4 is made of a kind of concavity blade 7, it can be connected 8 sides, air intake aperture of blade part 2 by welding, it is surrounded by half in air intake aperture 8(direction of rotation as shown by arrows according to the drill bit direction of rotation), generally it is arranged on place, back of blade part 2, promptly near handle of a knife 3 ends, sawtooth 5 can be an one with blade part 2, also can be welded on the blade part 2.Fig. 5～8 show the another kind of embodiment of sawtooth, the α angle of its sawtooth, β angle and γ are same as Fig. 3, just tooth is a high rigidity tool steel, and adopts welding or other method to be bumped into to be connected on 2 mouthfuls of the blade parts, and the width of this external tooth 9 is wider than the wall thickness of blade part 2 steel pipes slightly.

In another embodiment of the present utility model, effective in order further to make its dust discharge except that cutting, can be in blade part 2, near import 8 places a dust-break device (not shown) is set, this dust-break device can be made of a kind of filter screen, and at this moment blade part 2 is made up of two parts, and the form by the spiral shell button between them links together, and the dust-break device is fixed in the middle of being clipped in them, and wherein the dust-break device can unload cleaning at any time.

Claims

1, a kind of hollow boring bit, it is characterized in that it comprises the cutter head part, the blade part, shank portion and wind-force chip removal member, cutter head part and blade partly are hollow steel pipes, the cutter head part is made of sawtooth, described sawtooth from its hollow steel pipe end face along steel shaft to protruding, blade part one end is connected with cutter head portion, and the other end and handle of a knife join, blade partly is provided with the air intake aperture, wind-force chip removal member is arranged on the place, air intake aperture of blade part, described wind-force chip removal member is a kind of concavity blade, and it is surrounded by half in the air intake aperture of blade part according to the drill bit direction of rotation.

2, hollow boring bit according to claim 1, it is characterized in that described sawtooth is to be provided with like this, the cutting edge face of sawtooth becomes the β angle with crown end face line I, and the β angle is 30～75 °, another flank of tooth of sawtooth (non-cutting edge face) becomes the α angle with the line II, and α is 0～45 °.Excessive circular arc γ between two teeth is 2～50mm, outwards and inwardly distinguishes to zigzag intervals a low-angle.

3, hollow boring bit according to claim 1 is characterized in that the multiple of the number best 3 of described sawtooth, and tooth depth is 2～80mm.

4, hollow boring bit according to claim 1 it is characterized in that sawtooth is placed on the blade part by welding, and sawtooth is a high carbon tool steel.

5, hollow boring bit according to claim 1 is characterized in that the described wide thickness of steel pipe of slightly being wider than of sawtooth that is welded on the blade part.

6, hollow boring bit according to claim 1, what it is characterized in that described blade part enters the aperture generally with the setting of steel pipe radial symmetric, and general quantity is 2～8, and the aperture is arranged on contiguous handle of a knife place.

7, hollow boring bit according to claim 1 is characterized in that wind-force chip removal member can be connected in the place, air intake aperture of blade part by welding.

8, hollow boring bit according to claim 1, it is characterized in that in the blade part, a dust-break device being set near import department, this dust-break device can be made of a kind of filter screen, this moment, the blade part was made up of two parts, form by the spiral shell button between them links together, and the dust-break device is fixed in the middle of being clipped in them.