CN2792664Y

CN2792664Y - Cutting part conic corner-guiding structure for drilling bit

Info

Publication number: CN2792664Y
Application number: CN 200420117681
Authority: CN
Inventors: 林启津
Original assignee: XIAOBOSHI CO Ltd
Current assignee: XIAOBOSHI CO Ltd
Priority date: 2004-11-01
Filing date: 2004-11-01
Publication date: 2006-07-05
Anticipated expiration: 2014-11-01

Abstract

The utility model discloses a drill which can increase the accuracy of drilling, the drilling capacity and the chip throwing capacity. The drill is composed of a drill tip of a cutting portion and a drill body which is provided with at least two radical direction opposite spiral grooves, and the drill body comprises an extending clamper portion; the cutting portion of the drill tip is provided with two symmetrical planes of which the front side is in a pointed cone columnar shape and the side surface is a wedge cone; the centre drill point of the drill tip of both the two symmetrical planes is in a point, and one side of the symmetrical plane is a conical surface, and the other spiral plane is a scudding, and one side of the scudding is the front end of which the outside is bigger than the drill body, and the outside of the scudding is provided with the knife edge; the chip removal slope which extends to the bottom of the cutting portion from the drill tip is arranged between the scudding and the drill tip, and thus the accuracy of the drilling, the drilling capacity and the chip throwing capacity can be increased accordingly.

Description

The cutting portion conical surface lead angle structure of drill bit

Technical field

The utility model relates to a kind of cutting portion structure-improved of drill bit, relates in particular to and a kind ofly is modified to point, bores the apex point that point is a bit (but not a line), with boring detent force, cutting force and the chip removal power etc. of the improving drill bit performance of holing.

Background technology

Fig. 1, Figure 2 shows that cutting portion 20a that the drill bit of existing drilling operation, described drill bit 10a comprise a column type and bore body 30a, bore body 30a an a pair of helical groove 40a and a clamping part 50a are provided.Described clamping part 50a fixes for the chuck of boring bar tool.The cutting portion 20a of drill bit 10a is generally taper shape, and the tip is a mound line 21a, and extends a pair of radially opposite blade 22a thus, and the extending part of described blade 22a and helical groove 40a join.

Above-mentioned general drill bit 10a is because cutting portion 20a is conical, and the apex point angle is greater than 90 degree, make the bigger boring resistance of formation when digging into workpiece, make drilling efficiency bad, add that chip removal design ground is bad, the detritus that boring cutting portion 20a is dug out can't effectively discharge and stay and cause bigger resistance in the boring, and bore operation is caused the secondary resistance; Again because the existing apex point that contact with workpiece is a mound line 21a, in contact during work, the location of its drilling construction is difficult for accurate, often causes bore position generation error with this mound line 21a.

The utility model content

The cutting portion apex point that primary technical problem to be solved in the utility model is to provide a kind of cutting portion of drill bit to adopt side wedge shape awl, reducing the frictional force of cutting portion and workpiece, and the cutter of increase shaving digs power; The workpiece detritus is dug and struck off to knife edge mouth with shaving; With the other chip removal inclined-plane of shaving with outside the detritus leadout hole; With the point-like apex point workpiece is accurately located.

The structure of creating in the drill bit field is located in the utility model utilization, be set sharp apex point of cutting portion and front pointed cone column, the plane of symmetry of side wedge shape awl, the shaving that the outside of the front end on the plane of symmetry is big slightly and the rear end dwindles, and apex point is a brill point etc., and reach the boring location accurately, pierce the lifting of workpiece ability and chip removal ability, the existing bit drills turning work piece of improvement is crossed and is reached the chip removal defect of insufficient slowly really.

Description of drawings

Fig. 1 is the vertical view of existing drill bit.

Fig. 2 is the front view of Fig. 1.

Fig. 3 is a stereogram of the present utility model.

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

Fig. 5 is the front view of Fig. 3.

Fig. 6 is the left side view of Fig. 3.

Fig. 7 is the boring chip removal schematic diagram of the utility model better embodiment.

The main element symbol description

Existing:

Drill bit 10a cutting portion 20a

Mound line 21a sword 22a

Bore body 30a helical groove 40a

Clamping part 50a

The utility model

Drill bit 10 cutting portions 20

Apex point 21 bores point 22

The shaving 23 front ends outside 231

Knife edge mouth 24 chip removal inclined-planes 25

Bore body 30 helical grooves 40

Clamping part 50 anti-slop serrations 51

Workpiece 60 borings 61

Detritus 62

The specific embodiment

Existing conjunction with figs. is as follows with detailed description of the preferred embodiment of the present utility model.

Please refer to Fig. 3-shown in Figure 6.The utility model drill bit 10 consists predominantly of an apex point 21 and and bores body 22; Described brill body 22 comprises a clamping part 50 that extends and has at least two radially opposite helical grooves 40, and described helical groove 40 extends a suitable length to clamping part 50; The cutting portion 20 of described apex point 21 is provided with at least two planes of symmetry less than 90 degree, and the front of the described plane of symmetry is that pointed cone column, side are the wedge shape awl, and apex point 21 centers of two planes of symmetry are one and bore point, and a non-drilling limit of the described plane of symmetry is the conical surface; One side that another of the described plane of symmetry is screwed into face be the front end outside 231 greater than the shaving 23 of boring body 30, and described shaving 23 outsides are provided with knife edge mouth 24, described shaving 23 bottoms are overhead kick with the ending of boring body 30; Between shaving 23 and apex point 21, be provided with a chip removal inclined-plane 25 that extends to cutting portion 20 bottoms by apex point 21 in addition.

Please be simultaneously with reference to Fig. 7, according to said structure, when using drill bit 10 drilling workpiece 60 of the present utility model, because being one, the apex point 21 of described drill bit 10 cutting portions 20 bores point 22, thereby can be exactly in the position of workpiece 60 location drillings 61, the wedge shape cone flank face of the cutting portion 20 of described apex point 21 and the shaving 23 front ends outside 231 are greater than the structural design of boring body 30, can make positive shaving 23 obtain bigger cutter scraping ability, and more can increase its cutter at the set knife edge mouth 24 of shaving 23 outer rims and scrape efficient, and workpiece 60 detritus 62 that shaving 23 has been dug more can be caused cutting portion 20 rear ends to arrange from cutting portion 20 by shaving 23 other chip removal inclined-planes 25, more can be expelled to the surface of workpiece 60 by the helical groove 40 on the brill body 30.

In sum, the utility model can utilize is located at the structure of creating in drill bit 10 fields, be cutting portion 20 set sharp apex points 21 and front pointed cone column, the plane of symmetry of side wedge shape awl, the shaving 23 that the outside of the front end on the plane of symmetry 231 is big slightly and the rear end dwindles, and apex point 21 is a brill point 22 etc., and reach the boring location accurately, pierce the lifting of workpiece ability and chip removal ability, the existing bit drills turning work piece of improvement is crossed and is reached the chip removal defect of insufficient slowly really.

The above only is a preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model principle; can also carry out some improvement and modification to the utility model, these improvement and modification also fall in the protection domain of the utility model claim.

Claims

1. the cutting portion conical surface lead angle structure of a drill bit is characterized in that: apex point that comprises a cutting part at least and brill body with at least two radially opposite helical grooves, and described brill body comprises a clamping part that extends; The cutting portion of described apex point is provided with at least two, and the apex point center of two planes of symmetry is one and bores point less than the front pointed cone column of 90 degree and the plane of symmetry of side wedge shape awl, and a non-drilling limit of the described plane of symmetry is the inclined-plane; One side that another of the described plane of symmetry is screwed into face is the shaving of the front end outside greater than the brill body, and is provided with knife edge mouth outside the shaving, and described shaving bottom is overhead kick with the ending of boring body; Between shaving and apex point, be provided with a chip removal inclined-plane that extends to the cutting portion bottom by apex point.

2. the cutting portion conical surface lead angle structure of drill bit as claimed in claim 1, it is characterized in that: the clamping part of described brill body has non-circular section.

3. the cutting portion conical surface lead angle structure of drill bit as claimed in claim 1, it is characterized in that: the clamping part of described brill body is provided with anti-slop serrations.