CN103273120B - A kind of apex point of drill bit - Google Patents
A kind of apex point of drill bit Download PDFInfo
- Publication number
- CN103273120B CN103273120B CN201310188234.9A CN201310188234A CN103273120B CN 103273120 B CN103273120 B CN 103273120B CN 201310188234 A CN201310188234 A CN 201310188234A CN 103273120 B CN103273120 B CN 103273120B
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- China
- Prior art keywords
- rear corner
- angle
- corner surface
- chisel edge
- apex point
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The invention discloses a kind of apex point of drill bit, comprise brill body, the drill lip part of screw type Cooling Holes and spirality ditch back of the body groove and drillstock part, the apex point of drill lip part is X-shaped seven sword composition, described X-shaped seven basil center is 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 ditch trough back of the body is the curve of R1, R2 and R3 tri-circular arc compositions, and the value of R1, R2 and R3 is respectively the product of R1=0.45 and bit diameter, the product of R2=0.915 bit diameter, the product of R3=0.16 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 3rd rear corner surface is obtuse angle, and the angle Q in chisel edge face is acute angle; 3rd rear corner surface carries on the back by the 3rd rear corner surface and ditch the crest line that the crossing crest line of the intersection of grooves and the 3rd rear corner surface and the second rear corner surface and chisel edge face and the 3rd rear corner surface intersect to surround.The present invention is used for drill bit.
Description
Technical field
The present invention relates to a kind of cutting tool, particularly a kind of apex point of drill bit.
Background technology
The structure that the apex point of existing internal-cooling bit of drill is general is a chisel edge and two major cutting edges, and this drill bit structure exists quick abrasion, the defect that the life-span is low and cutting resistance is larger, and in the borehole the phenomenon that drill bit falls block, broken edge easily occurs.Also the drill bit had is the structure of web thinning, and this apex point structure realizes complicated and difficulty and uniformity is poor, and service life is low.
Summary of the invention
The object of the invention 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 realizing the object of the invention is, a kind of apex point of drill bit, comprise brill body, the drill lip part of screw type Cooling Holes and spirality ditch back of the body groove and drillstock part, it is characterized in that: the apex point of described drill lip part is X-shaped seven sword composition, described X-shaped seven basil center is 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 of R1, R2 and R3 tri-circular arc compositions, 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 bit diameter, the product of R3=0.16 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 3rd rear corner surface is obtuse angle, and the angle Q in chisel edge face is acute angle; Described 3rd rear corner surface carries on the back by the 3rd rear corner surface and ditch the crest line that the crossing crest line of the intersection of grooves and the 3rd rear corner surface and the second rear corner surface and chisel edge face and the 3rd rear corner surface intersect to surround.The value of the angle β of described chisel edge face and the 3rd rear corner surface is 100-105 °.The angle in described chisel edge face is 0-5 °.
It is good that the present invention has anti-wear performance compared with the prior art, the remarkable advantage of the little and long service life of cutting resistance.
Accompanying drawing illustrates:
Fig. 1 is front view of the present invention, and Fig. 2 is the enlarged diagram of bit part of the present invention, and Fig. 3 is the left view of Fig. 2, and Fig. 4 is the A-A profile of Fig. 2, and Fig. 5 is the B-B profile of Fig. 2, and Fig. 6 is the C-C profile of Fig. 2.
Detailed description of the invention:
In conjunction with above-mentioned accompanying drawing, embodiments of the invention are elaborated, drill bit of the present invention is made up of (see Fig. 1) apex point 1, blade 2 and handle of a knife 3, two spiral interior Cooling Holes 4 are provided with in drill body, the interior Cooling Holes of drillstock part is the straight Cooling Holes 5 being parallel to drill body axis, and knife edge part has spirality ditch to carry on the back and groove 7.The apex point structure of drill bit of the present invention is the X-type apex point with drill groove matching form, this X-type apex point has 7 swords, namely one is bored core sword 12, two chisel edge angle swords 13,16, and two circular arc major cutting edges, 14,17 and two straightway major cutting edges 15,18(are see Fig. 3).
The shape of drill groove of the present invention is that R1, R2, R3 tri-circular arcs and one section of straight line form (see 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 the joining of point of contact extended line in R3 circular arc with drill bit vertical center line; 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 crossingly with bit diameter outer rim place to determine; R3 circular arc home position, becomes on the oblique line of 9 ° at drill bit vertical center line, determine with bit drills core circular arc is circumscribed.
Straightway is at bit diameter outer rim place, crossingly on drill bit elongated central line to determine with the R2 circular arc of drill groove and crossing.
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 3rd rear corner surface is obtuse angle, generally get 100-105 °, the angle θ in chisel edge face 11 is acute angle, generally get 0-5 °, mark 10 in Fig. 2 is the 3rd rear corner surface, this the 3rd rear corner surface is the face having following two articles of crest lines and one article of the 3rd rear corner surface intersection crossing with ditch back-trough to surround, and above-mentioned two articles of crest lines are the crest line intersected by the 3rd rear corner surface crest line crossing with the second rear corner surface 9 and chisel edge face 11 and the 3rd rear corner surface respectively.There are two major cutting edges 6, groove, the first rear corner surface 8, second rear corner surface 9, the 3rd rear corner surface and chisel edge face in chisel edge face of the present invention.
Claims (3)
1. the apex point of a drill bit, comprise brill body, the drill lip part of screw type Cooling Holes and spirality ditch back of the body groove and drillstock part, it is characterized in that: the apex point of described drill lip part is X-shaped seven sword, described XXing Qiren center is for boring core sword, and the bilateral symmetry of boring core sword at this is provided with the major cutting edge of two chisel edges 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 of R1, R2 and R3 tri-circular arc compositions, the value of described R1, R2 and R3 is respectively the product that R1 equals 0.45 and bit diameter, R2 equals the product of 0.915 and bit diameter, and R3 equals the product of 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 3rd rear corner surface is obtuse angle, chisel edge face and cross chisel edge and angle theta between the face being parallel to drill axis is acute angle; Described 3rd rear corner surface is that the intersection carrying on the back grooves by following two articles of crest lines and one article of the 3rd rear corner surface and ditch surrounds, and above-mentioned two articles of crest lines are the crest line intersected by the 3rd rear corner surface crest line crossing with the second rear corner surface and chisel edge face and the 3rd rear corner surface respectively.
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 3rd 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 in described chisel edge face is 0-5 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310188234.9A CN103273120B (en) | 2013-05-21 | 2013-05-21 | A kind of apex point of drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310188234.9A CN103273120B (en) | 2013-05-21 | 2013-05-21 | A kind of apex point of drill bit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103273120A CN103273120A (en) | 2013-09-04 |
| CN103273120B true CN103273120B (en) | 2016-01-20 |
Family
ID=49055798
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310188234.9A Expired - Fee Related CN103273120B (en) | 2013-05-21 | 2013-05-21 | A kind of apex point of drill bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103273120B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104827094A (en) * | 2015-05-26 | 2015-08-12 | 苏州阿诺精密切削技术股份有限公司 | V-shaped positioning double-screw locking tooth crown drill bit |
| CN104907614A (en) * | 2015-05-26 | 2015-09-16 | 苏州阿诺精密切削技术股份有限公司 | V-shaped locating double-screw locking crown drill rod |
| CN104827101A (en) * | 2015-05-26 | 2015-08-12 | 苏州阿诺精密切削技术股份有限公司 | Y-shaped inner-cooling double-bolt locking tooth crown drill rod |
| CN104827093A (en) * | 2015-05-26 | 2015-08-12 | 苏州阿诺精密切削技术股份有限公司 | Y-shaped inner-cooling double-bolt locking tooth crown drill bit |
| CN105436578B (en) * | 2015-12-18 | 2017-10-03 | 株洲钻石切削刀具股份有限公司 | A kind of drilling cutters |
| CN107414149A (en) * | 2017-08-03 | 2017-12-01 | 四川明日宇航工业有限责任公司 | A kind of process for machining of helical-shaped bit and titanium-aluminium alloy part |
| CN209849949U (en) | 2018-01-29 | 2019-12-27 | 米沃奇电动工具公司 | Drill bit |
| CN109262029B (en) * | 2018-10-29 | 2020-05-15 | 株洲钻石切削刀具股份有限公司 | Inner-cooling twist drill |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3162309B2 (en) * | 1996-11-28 | 2001-04-25 | オーエスジー株式会社 | Tomoe type thinning drill with chisel for high-speed heavy cutting |
| CN2933668Y (en) * | 2006-08-16 | 2007-08-15 | 大连轻工业学院 | Carbide alloy highly effective drill point |
| CN201295785Y (en) * | 2008-01-21 | 2009-08-26 | 周安善 | Multi-point thin-plate twist drill with a slotting-cutter-shaped outer edge and with 120 degrees sharp angle of the outer edge |
| JP2009172726A (en) * | 2008-01-25 | 2009-08-06 | Disco Abrasive Systems:Kk | Working tool formed by plating layer |
| CN101670458A (en) * | 2008-09-12 | 2010-03-17 | 汤明仙 | Twist drill |
| CN203409319U (en) * | 2013-05-21 | 2014-01-29 | 江苏晶工工具有限公司 | Drill tip of drill bit |
-
2013
- 2013-05-21 CN CN201310188234.9A patent/CN103273120B/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN103273120A (en) | 2013-09-04 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160120 Termination date: 20160521 |
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| CF01 | Termination of patent right due to non-payment of annual fee |