CN202845874U - Curved edge drill - Google Patents
Curved edge drill Download PDFInfo
- Publication number
- CN202845874U CN202845874U CN 201220592210 CN201220592210U CN202845874U CN 202845874 U CN202845874 U CN 202845874U CN 201220592210 CN201220592210 CN 201220592210 CN 201220592210 U CN201220592210 U CN 201220592210U CN 202845874 U CN202845874 U CN 202845874U
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- edge
- drill
- cutting
- cutting edge
- bent
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Abstract
The utility model discloses a curved edge drill. The curved edge drill comprises three cutting edges, two main cutting edges (1.2) symmetrically distributed and a lateral edge (3), wherein the lateral edge (3) is connected with the two main cutting edges (1.2). The curved edge drill is characterized in that the lateral edge (3) is S-shaped. Two spiral inner-cooling holes (6) are placed on a drill body in an axial symmetry mode, wherein the two spiral inner-cooling holes rotates surrounding a drill shaft in a spiral mode. The spiral inner-cooling holes (6) expose outwards in a bidirectional mode. A scrap discharge groove is in a concave grooved structure. Each main cutting edge is composed of a linear inner edge, an inner-concave main bottom edge and a circular-arc edge. The inner-concave main bottom edge is connected with subsidiary cutting edge through the circular-arc edge as transition. The circular-arc edge is specially made and is connected with the curved main cutting edge and the subsidiary cutting edge, and the transition of the circular-arc edge is paced between the main cutting edge and the subsidiary cutting edge; and therefore edge tipping does not easily appear; cooling type is inner-cooling so that the drill head can be well cooled in the machining process and service life of cutter tools is prolonged.
Description
Technical field
The utility model belongs to the metal cutting tool technical field, relates to the bent cutting drill in a kind of Drilling operation.
Background technology
In the machinery industry, Drilling operation accounts for 22% of machining total time, and consequence is arranged in mechanical manufacturing field.Use in the hole processing maximum be exactly fluted drill, and the fluted drill helicla flute is the important parameter that affect drilling performance, and the appearance that affects fluted drill is considered to be worth doing, chip removal ability.
The fried dough twist of standard is drilled with three cutting edges, two symmetrical main cutting edge and central chisel edge drill point angles are generally 118 °, what connect two main cutting edges is central chisel edge, chisel edge is straight perpendicular with axis cutter, very large front top rake angle is arranged near the chisel edge of fluted drill, so during drilling and workpiece spare produce strong extruding, increasing drilling thrust. web thinning can improve the centering of chisel edge and make, reduces drill thrust, the anterior angle of the main cutting edge each point of fluted drill alters a great deal, from outer rim to unbearable, anterior angle is very large negative value by on the occasion of reducing gradually to unbearable place; Because the chisel edge of standard fluted drill anterior angle value long, unbearable place is very large, centering is bad, should not pierce workpiece; The spill fluting makes radial rake very large, causes very thin cusp occurring in the place of cutting edge and land handing-over, is easy to occur the tipping phenomenon in process; The common drill bit type of cooling is outer cold, is difficult to realize cooling in process, makes Driller Exothermic very serious, has affected the performance of drill bit, serious wear; The general reconditioning of prior art chisel edge is straight line, although axial force descends to some extent, feels relieved and the effect that pierces workpiece is not fine.
The utility model content
The purpose of this utility model is the defective that overcomes above-mentioned prior art, provides a kind of carbide alloy high efficiency drill to be provided with interior cold hole, can well cool off drill bit in process, has increased the new bent cutting drill of cutting-tool's used life.
The technical solution of the utility model:
A kind of bent cutting drill, it has three cutting edges, two symmetrical main cutting edge and chisel edges, chisel edge connects two main cutting edges, and chisel edge is the S type; Axial symmetry is provided with cold hole in two spirals around drill body axle spiral rotating on the drill body, and cold hole is two-way externally uncovered in the spiral.
Preferably: the chip area of described bent cutting drill is the structure of spill fluting.
Main cutting edge is comprised of linear inner edge, concave shaped master's shear blade and Circular Nose Cutting Edge; Concave shaped master's shear blade is connected with front cutting edge by the Circular Nose Cutting Edge transition.
Chisel edge outwards is connected with the linear inner edge, and the linear inner edge outwards is connected with concave shaped master shear blade, and concave shaped master's shear blade is towards the recessed contracting of direction of chip area; Inner spill master shear blade outwards is connected with Circular Nose Cutting Edge; The distribution that centered by bent cutting drill central shaft, is centrosymmetric of two main cutting edges; The distribution that centered by bent cutting drill central shaft, is centrosymmetric of two front cutting edges.
The beneficial effects of the utility model:
1, reconditioning S type chisel edge can reduce axial force and moment of torsion, and the centering that has strengthened and easily pierce the effect in hole increases the chip space of unbearable part;
2, the axial force of Baltimore groove design drill bit is minimum.Because the anterior angle of Baltimore groove is larger than the anterior angle of linear and convex, cutting edge is sharp, cut brisk, so axial force is minimum;
3, very thin cusp appears in the place for cutting edge and land handing-over, in process, be easy to occur the tipping phenomenon, make especially Circular Nose Cutting Edge, junction curve main cutting edge and front cutting edge, making has a Circular Nose Cutting Edge transition between main cutting edge and the front cutting edge, be difficult for producing tipping;
4, make things convenient for coping drills to make processed hole site precision good, surface quality is good.
5, the type of cooling is interior cold, can well cool off drill bit in process, has increased cutting-tool's used life.
Description of drawings
Fig. 1 is that the master of the utility model embodiment 1 looks schematic diagram.
Fig. 2 is the Baltimore groove schematic diagram of the utility model embodiment 1.
The specific embodiment
The utility model is by the following examples can the utility model will be further described, yet scope of the present utility model is not limited to following embodiment.
Embodiment 1:
The bent cutting drill of present embodiment, it has three cutting edges, two symmetrical main cutting edges 1,2 and chisel edge 3, chisel edge 3 connects two main cutting edges 1,2, and chisel edge 3 is the S type; Axial symmetry is provided with cold hole 6 in two spirals around drill body axle spiral rotating on the drill body, and cold hole 6 is two-way externally uncovered in the spiral.Reconditioning S type chisel edge can reduce axial force and moment of torsion, and the centering that has strengthened and easily pierce the effect in hole increases the chip space of unbearable part.The type of cooling is interior cold, can well cool off drill bit in process, has increased cutting-tool's used life.
Main cutting edge 1,2 is comprised of linear inner edge 1-1,2-1, concave shaped master's shear blade 1-2,2-2 and Circular Nose Cutting Edge 1-3,2-3; Concave shaped master's shear blade 1-2,2-2 are connected with front cutting edge 4-1,4-2 by Circular Nose Cutting Edge 1-3,2-3 transition.Make Circular Nose Cutting Edge, junction curve main cutting edge and front cutting edge, making has a Circular Nose Cutting Edge transition between main cutting edge and the front cutting edge, be difficult for producing tipping.
Chisel edge 3 outwards is connected with linear inner edge 1-1, and linear inner edge 1-1 outwards is connected with concave shaped master shear blade 1-2, and concave shaped master's shear blade 1-2 is towards the recessed contracting of direction of chip area; Inner spill master shear blade 1-2 outwards is connected with Circular Nose Cutting Edge 1-3; Two main cutting edges 1,2 distribution that centered by bent cutting drill central shaft, is centrosymmetric; Two front cutting edge 4-1,4-2 distribution that centered by bent cutting drill central shaft, is centrosymmetric.Make things convenient for coping drills to make processed hole site precision good, surface quality is good.
The chip area of described bent cutting drill is the structure of spill fluting 5.The axial force of Baltimore groove design drill bit is minimum.Because the anterior angle of Baltimore groove is larger than the anterior angle of linear and convex, cutting edge is sharp, cut brisk, so axial force is minimum.
Claims (4)
1. bent cutting drill, it has three cutting edges, two symmetrical main cutting edge (1,2) and chisel edges (3), chisel edge (3) connects two main cutting edges (1,2), it is characterized in that chisel edge (3) is the S type; Axial symmetry is provided with cold hole (6) in two spirals around drill body axle spiral rotating on the drill body, and cold hole (6) is two-way externally uncovered in the spiral.
2. bent cutting drill according to claim 1 is characterized in that the chip area of described bent cutting drill is the structure of spill fluting (5).
3. bent cutting drill according to claim 1 and 2 is characterized in that main cutting edge (1,2) is comprised of linear inner edge (1-1,2-1), concave shaped master's shear blade (1-2,2-2) and Circular Nose Cutting Edge (1-3,2-3); Concave shaped master's shear blade (1-2,2-2) is connected with front cutting edge (4-1,4-2) by Circular Nose Cutting Edge (1-3,2-3) transition.
4. bent cutting drill according to claim 1 and 2, it is characterized in that chisel edge (3) outwards is connected with linear inner edge (1-1), linear inner edge (1-1) outwards is connected with concave shaped master shear blade (1-2), and concave shaped master's shear blade (1-2) is towards the recessed contracting of direction of chip area; Inner spill master shear blade (1-2) outwards is connected with Circular Nose Cutting Edge (1-3); Two main cutting edges (1,2) distribution that centered by bent cutting drill central shaft, is centrosymmetric; Two front cutting edges (4-1,4-2) distribution that centered by bent cutting drill central shaft, is centrosymmetric.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220592210 CN202845874U (en) | 2012-11-12 | 2012-11-12 | Curved edge drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220592210 CN202845874U (en) | 2012-11-12 | 2012-11-12 | Curved edge drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202845874U true CN202845874U (en) | 2013-04-03 |
Family
ID=47977110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220592210 Expired - Fee Related CN202845874U (en) | 2012-11-12 | 2012-11-12 | Curved edge drill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202845874U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104416196A (en) * | 2013-09-09 | 2015-03-18 | 天工爱和特钢有限公司 | Spiral tip bit |
| CN106563839A (en) * | 2015-10-09 | 2017-04-19 | 镇江市丹徒区甬江工具厂 | Three-slot reaming step drill |
| CN112207330A (en) * | 2020-09-21 | 2021-01-12 | 中车株洲电力机车有限公司 | Drill bit |
-
2012
- 2012-11-12 CN CN 201220592210 patent/CN202845874U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104416196A (en) * | 2013-09-09 | 2015-03-18 | 天工爱和特钢有限公司 | Spiral tip bit |
| CN106563839A (en) * | 2015-10-09 | 2017-04-19 | 镇江市丹徒区甬江工具厂 | Three-slot reaming step drill |
| CN112207330A (en) * | 2020-09-21 | 2021-01-12 | 中车株洲电力机车有限公司 | Drill bit |
| CN112207330B (en) * | 2020-09-21 | 2022-06-14 | 中车株洲电力机车有限公司 | Drilling method for austenitic stainless steel thin-wall substrate |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Curved edge drill Effective date of registration: 20170510 Granted publication date: 20130403 Pledgee: Jing'an branch of China Co truction Bank Corp Pledgor: JIANGXI JIEHAO CARBIDE TOOL CO., LTD. Registration number: 2017360000001 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130403 Termination date: 20181112 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |