CN2500448Y

CN2500448Y - Flat drill bit

Info

Publication number: CN2500448Y
Application number: CN 01239395
Authority: CN
Inventors: 王宇红
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-05-17
Filing date: 2001-05-17
Publication date: 2002-07-17
Anticipated expiration: 2011-05-17

Abstract

A flat drill bit consists of a flat drill bit and a drill rod. The flat drill bit is provided with a conical head on the top end. A cuttings shoot is provided on the conical head. The whole lateral side of the flat drill is manufactured into anti-symmetric bevel edges as the flat drill bit cutting edges according to the longitudinal axis and the rotation direction and the whole flat drill bit is twisted clockwisely according to the rotation direction. The flat drill bit could bore a hole rotatably. A socket for drilling speed improvement is also provided on the plate drill bit. The utility model has the advantages of easy manufacture, work stability, high efficiency, convenient repetitive sharpening and repairing of the cutting edges by a rasp after long term usage and long service life of the drill bit.

Description

A kind of chit drill drill bit

A kind of chit drill drill bit relates to into the manufacturing technology of drill, is a kind of novel drill bit, is applicable to together with electric portable drill or cordless bores and drilling machine uses.

Drill bit is an instrument commonly used in enterprise, maintenance and the service industry, though the size dimension of drill bit is different, mostly is circular cross-section, and upper semisection is spirality or thread-shaped drill bit district, and lower semisection is the drilling rod district.The drilling rod district firmly is clipped in the chuck of electric drill or cordless brill or drilling machine, carries out drilling operation.Though this drill bit is easy to use, Completion of Drilling Hole is fast, because drill bit district spirality or thread-shaped cutting limit is difficult for repairing in the use wearing and tearing back of long period, has influenced the service life of drill bit, and the less stable during this class drill bit work.

In order to overcome the deficiency that existing drill bit exists, the inventor has proposed a kind of good cutting that has through studying for a long period of time, sharpens reparation easily, good stability and easily manufactured flat drill bit during work after the long-term work cutting limit wearing and tearing.

The utility model is to constitute like this: the drill bit upper semisection is the flat drill head part, and lower semisection is the drilling rod part.The thickness of flat drill head part begins to flatten gradually attenuate from itself and drilling rod part connecting portion and becomes shovel shape shape to flat drill head part other end extension process, top middle portion in the flat drill head part is equipped with conical head, be provided with flute on conical head, flute extends to flat drill head part plane.The whole side of flat drill bit is according to longitudinal axis, will be by direction of rotation by the conical head side, top margin, side is made the cutting limit of both sides antisymmetry hypotenuse as the flat drill bit, cutting depth when considering flat drill bit work, the angle on the intensity of speed and drill bit and stable hypotenuse and plane is between 5 °～10 °, optimum angle is 6 °, and according to the drill bit of different size with whole flat drill head part by direction of rotation, right-hand lay, make flat drill bit side be a level and smooth camber line continuously, top margin forms 4 °～10 ° top rake, make its energy rotary drilling, be cut the thickness of material and the job stability of cutting speed and flat drill bit when considering flat drill bit work, best twisting angle is 6 °.The side of chit drill is connected with top margin circular arc, is equipped with groove on the chit drill plane of top margin and side connecting portion, and groove is generally hemispherical, also can be taper or truncated cone-shaped or ellipse or pyramid.The groove part trough rim constitutes sharp-pointed side cut with the connecting portion of top margin and side, can further improve the cutting ability of flat drill bit.

Planar section at flat drill bit is provided with aperture, can hang flat drill bit up keeping by aperture when flat drill bit is not worked.

The utility model advantage is tangible, bit part is made flat shovel shape, and by the direction of rotation right-hand lay, the whole side of flat drill bit is made the cutting limit of both sides antisymmetry hypotenuse as the flat drill bit according to longitudinal axis, the top of flat drill bit is provided with bullet, on bullet, be equipped with flute, in boring procedure, being cut object when increasing the boring volume gradually can flow out rapidly from flute, the speed and the drilling efficiency of boring have been improved, on the chit drill plane of top margin and side connecting portion, be equipped with groove, the connecting portion of groove limit and top margin and side constitutes sharp-pointed cutting edge, in boring procedure, can further improve the cutting ability of flat drill bit, reduced the drilled object crushing in the boring procedure.Especially reparation can be repeated to sharpen with file easily in the cutting limit of the utility model drill bit after the work of long period, makes the just long with the life-span of the utility model drill bit.

Accompanying drawing is the utility model embodiment schematic diagram, wherein:

Fig. 1. be the utility model front elevational schematic,

Fig. 2. be the utility model schematic side view,

Fig. 3 .A-A generalized section,

Fig. 4 .B-B generalized section,

Fig. 5. the cone-shaped groove schematic diagram,

Fig. 6. circle basin connected in star schematic diagram,

Fig. 7. pyramid groove schematic diagram,

Fig. 8. flat pyramid groove schematic diagram,

Fig. 9. the oval-shaped groove schematic diagram.

Figure 10. the hemispherical groove schematic diagram.

The utility model will be further described according to above-mentioned accompanying drawing.

The drill bit that the utility model provides divides 8 to be integral and to constitute by flat drill bit 1 and drilling rod.Flat drill bit 1 is from flattening into the spade shape forward gradually with drilling rod 7 connecting portions, is equipped with conical head 3 in the top middle portion of flat drill bit 1, is provided with flute 4 on conical head 3, and flute 4 extends to the planar section of flat drill bit.The whole side of flat drill head part 1 will be made the cutting limit of the antisymmetric hypotenuse in both sides as flat drill bit 1 according to longitudinal axis by side, the top margin 5 of flat drill bit 1, the side 7 of conical head 3 by direction of rotation, and the angle on hypotenuse and plane is 6 °.By 6 ° of direction of rotation, right-hand lays, flat drill bit side is a level and smooth camber line continuously, changes the hole so that flat drill bit 1 part can be rotated with flat drill bit 1 part.The side 7 of flat drill bit 1 is connected with top margin 5 circular arcs, on the flat drill bit plane of top margin 5 and side 7 connecting portions, be equipped with groove 2, groove 2 is a hemispherical, the part trough rim of groove 2 constitutes sharp-pointed cutting edge with the connecting portion of top margin 5 and side 7, with the cutting ability of further raising flat drill bit 1.Planar section at flat drill bit 1 is provided with aperture 6, can not hang flat drill bit up keeping by aperture 6 when flat drill bit 1 is not worked.

Fig. 5 is cone-shaped groove 9 schematic diagrames that the utility model is equipped with cone-shaped groove 9 flat drill bits.

Fig. 6 is round basin connected in star 10 schematic diagrames that the utility model is equipped with round basin connected in star 10 flat drill bits.

Fig. 7 is pyramid groove 11 schematic diagrames that the utility model is equipped with pyramid groove 11 flat drill bits.

Fig. 8 is flat pyramid groove 12 schematic diagrames that the utility model is equipped with flat pyramid groove 12 flat drill bits.

Fig. 9 is oval-shaped groove 13 schematic diagrames of the utility model flat drill bit of being equipped with oval-shaped groove 13.

Figure 10. be hemispherical groove 14 schematic diagrames that the utility model is equipped with semi-circular recesses 14 flat drill bits.

Claims

1. chit drill drill bit, constitute by flat drill head part (1) and drilling rod branch (8), it is characterized in that: flat drill head part (1) is from flattening into the spade shape forward gradually with drilling rod part (8) connecting portion, top middle portion in flat drill head part (1) is equipped with conical head (3), on conical head (3), be provided with flute (4), the whole side of flat drill head part (1) is according to longitudinal axis, make the cutting limit of the antisymmetric hypotenuse in both sides by direction of rotation as flat drill head part (1), whole flat drill head part (1) is pressed direction of rotation, right-hand lay, make top margin (5) form top rake, on the plane of top margin (5) and side (7) connecting portion, be equipped with groove (2), be equipped with aperture (6) in flat drill head part (1) in-plane.

2. chit drill drill bit according to claim 1 is characterized in that: the hypotenuse on formation flat bit cutting limit and the angle on plane are between 5 °～10 °.

3. chit drill drill bit according to claim 1 is characterized in that: constituting the hypotenuse on flat bit cutting limit and the optimum angle on plane is 6 °.

4. chit drill drill bit according to claim 1 is characterized in that: flat drill bit (1) makes top margin (5) form 4 °～10 ° top rake by direction of rotation, right-hand lay.

5. chit drill drill bit according to claim 1 is characterized in that: the top rake best angle of top margin (5) is 6 °.

6. chit drill drill bit according to claim 1 is characterized in that: groove (2) is hemispherical groove or cone-shaped groove or circle basin connected in star or oval-shaped groove or flat pyramid groove or pyramid groove.

7. chit drill drill bit according to claim 1 is characterized in that: flute (4) extends to flat drill head part plane.

8. chit drill drill bit according to claim 1 is characterized in that: the connecting portion of the part limit of groove (2) and top margin (5) and side (7) constitutes sharp-pointed cutting edge.