CN203409319U

CN203409319U - Drill tip of drill bit

Info

Publication number: CN203409319U
Application number: CN201320276932.XU
Authority: CN
Inventors: 朱会昌; 赵建敏; 刘小兵
Original assignee: JIANGSU JINGGONG TOOLS Co Ltd
Current assignee: JIANGSU JINGGONG TOOLS Co Ltd
Priority date: 2013-05-21
Filing date: 2013-05-21
Publication date: 2014-01-29
Anticipated expiration: 2023-05-21

Abstract

The utility model discloses a drill tip of a drill bit. The drill tip comprises a drill body, a drill edge part with spiral cooling holes, a spiral groove back and a spiral groove, and a drill handle part, wherein the drill tip of the drill edge part is composed of seven X-shaped edges; a drill core edge is arranged among the seven X-shaped edges; two transverse edge angle edges, two arc-shaped main cutting edges and two straight-line main cutting edges are symmetrically arranged on the two sides of the drill core edge; the shape of the cross section of each of the groove and the groove back is a curve composed of R1, R2 and R3 circular arcs; the values of the R1, R2 and R3 are respectively as follows: the R1 is the product of 0.45 and the diameter of the drill bit; the R2 is the product of 0.915 and the diameter of the drill bit; the R3 is the product of 0.16 and the diameter of the drill bit; a primary rear angle alpha1 is 12-14 degrees and a secondary rear angle alpha2 is 33-35 degrees; an included angle beta between a transverse edge face and the primary rear angle is an obtuse angle and the angle theta of the transverse edge face is an acute angle; and a first rear angle face is surrounded by a crossed line of the first rear angle face, the groove back and the groove, an edge line of the first rear angle face and a second rear angle face, and an edge line of the transverse edge face and the first rear angle face. The drill tip of the drill bit can be used for the drill bit.

Description

A kind of apex point of drill bit

Technical field:

The utility model relates to the apex point of a kind of cutting tool, particularly a kind of drill bit.

Background technology:

The general structure of apex point of existing internal-cooling bit of drill is a chisel edge and two major cutting edges, and this drill bit structure exists quick abrasion, the low and larger defect of cutting resistance of life-span, and in boring, easily there is the phenomenon that drill bit falls piece, blade fracture.Also the drill bit having is the structure of web thinning, and this apex point structure realizes complicated and difficult and uniformity is poor, and service life is low.

Summary of the invention:

The utility model object is to provide a kind of apex point of drill bit, uses the drill bit of this apex point, and its abrasion resistance is good, the life-span is long and cutting resistance is little.

The technical scheme that realizes the utility model object is, a kind of apex point of drill bit, comprise brill body, drill lip part and the drillstock part of screw type Cooling Holes and spirality ditch back of the body groove, it is characterized in that: the apex point of described drill lip part is that X-shaped seven swords form, described X-shaped seven basil centers are for boring core sword, and the bilateral symmetry of boring core sword at this is provided with the major cutting edge of two chisel edge angle swords and two arcs and the major cutting edge of two straight lines; The shape of cross section of the described ditch trough back of the body is the curve that R1, R2 and tri-circular arcs of R3 form, and the value of described R1, R2 and R3 is respectively the product of R1=0.45 and bit diameter, the product of R2=0.915 and bit diameter, the product of R3=0.16 and bit diameter; A relief angle α ₁for 12-14 °, secondary relief angle α ₂for 33-35 °, the angle β of chisel edge face and the first rear corner surface is obtuse angle, and the angle θ of chisel edge face is acute angle; Described the first rear corner surface is by the first rear corner surface and ditch, to carry on the back the crossing crest line of the crossing crest line of the crossing intersection of groove and the first rear corner surface and the second rear corner surface and chisel edge face and the first rear corner surface to surround.The value of the angle β of described chisel edge face and the first rear corner surface is 100-105 °.The angle of described chisel edge face is 0-5 °.

It is good that the utility model has anti-wear performance compared with the prior art, the remarkable advantage of the little and long service life of cutting resistance.

Accompanying drawing explanation:

Fig. 1 is front view of the present utility model, and Fig. 2 is the enlarged diagram of the utility model bit part, and Fig. 3 is the left view of Fig. 2, Fig. 4 is the A-A profile of Fig. 2, Fig. 5 is the B-B profile of Fig. 2, and Fig. 6 is the C-C profile of Fig. 2, and Fig. 7 is the groove shape schematic diagram of drill bit.

The specific embodiment:

In conjunction with above-mentioned accompanying drawing, embodiment of the present utility model is elaborated, drill bit of the present utility model forms (referring to Fig. 1) by apex point 1, blade 2 and handle of a knife 3, in drill body, be provided with two spiral interior Cooling Holes 4, the interior Cooling Holes of drillstock part is the straight Cooling Holes that is parallel to drill body axis, and knife edge part has the spirality ditch back of the body and groove.The apex point structure of the utility model drill bit is the X-type apex point matching with drill groove shape, this X-type apex point has 7 swords, one is bored core sword 12, two 14,17 and two straightway major cutting edges 15 of 13,16, two circular arc major cutting edges of chisel edge angle sword, 18(referring to Fig. 3).

Be shaped as R1, R2, tri-circular arcs of R3 and one section of straight line of the utility model drill groove form (referring to Fig. 7).The value of R1, R2 and R3 is respectively: the product of R1=0.45 and interior cooling bit diameter, the product of R2=0.915 and interior cooling bit diameter, the product of R3=0.16 and interior cooling bit diameter.

R1 circular arc home position, is becoming the oblique line of 41.5 ° with drill bit vertical center line, with the joining of point of contact extended line in R3 circular arc; R2 circular arc home position, is becoming the oblique line of 3.5 ° with drill bit vertical center line, with the joining of point of contact extended line in R3 circular arc, and intersects and determines with bit diameter outer rim place; R3 circular arc home position, becomes at drill bit vertical center line on the oblique line of 9 °, determines with bit drills core circular arc is circumscribed.

Straightway is at bit diameter outer rim place, intersects and determines with crossing on bit central extended line with the R2 circular arc of drill groove.

A relief angle α ₁value be 12-14 °,

Secondary relief angle α ₂value be 33-35 °,

The angle β of chisel edge face and the first rear corner surface is obtuse angle, generally get 100-105 °, the angle θ of chisel edge face is acute angle, generally get 0-5 °, mark 10 in Fig. 2 is the first rear corner surface, this first rear corner surface is the face that has the crossing intersection of following two crest lines and first rear corner surface and ditch back-trough to surround, and above-mentioned two crest lines are respectively by the first rear corner surface and the crossing crest line of the second rear corner surface and chisel edge face and the crossing crest line of the first rear corner surface.

Claims

1. the apex point of a drill bit, comprise brill body, drill lip part and the drillstock part of screw type Cooling Holes and spirality ditch back of the body groove, it is characterized in that: the apex point of described drill lip part is that X-shaped seven swords form, described X-shaped seven basil centers are for boring core sword, and the bilateral symmetry of boring core sword at this is provided with the major cutting edge of two chisel edge angle swords and two arcs and the major cutting edge of two straight lines; The shape of cross section of the described ditch trough back of the body is the curve that R1, R2 and tri-circular arcs of R3 form, and the value of described R1, R2 and R3 is respectively the product of R1=0.45 and bit diameter, the product of R2=0.915 and bit diameter, the product of R3=0.16 and bit diameter; A relief angle α ₁for 12-14 °, secondary relief angle α ₂for 33-35 °, the angle β of chisel edge face and the first rear corner surface is obtuse angle, and the angle θ of chisel edge face is acute angle; Described the first rear corner surface is by the first rear corner surface and ditch, to carry on the back the crossing crest line of the crossing crest line of the crossing intersection of groove and the first rear corner surface and the second rear corner surface and chisel edge face and the first rear corner surface to surround.

2. the apex point of a kind of drill bit according to claim 1, is characterized in that: the value of the angle β of described chisel edge face and the first rear corner surface is 100-105 °.

3. the apex point of a kind of drill bit according to claim 1, is characterized in that: the angle of described chisel edge face is 0-5 °.