CN211135657U - Twist drill - Google Patents
Twist drill Download PDFInfo
- Publication number
- CN211135657U CN211135657U CN201922016819.8U CN201922016819U CN211135657U CN 211135657 U CN211135657 U CN 211135657U CN 201922016819 U CN201922016819 U CN 201922016819U CN 211135657 U CN211135657 U CN 211135657U
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- sword
- guide post
- drill
- blade
- initial position
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Abstract
The utility model discloses a twist drill, including cutting portion and stalk portion, the cutting portion includes drill point, sword lamella and chip groove, be equipped with preceding guide post sword and back guide post sword on the sword lamella, the initial position of preceding guide post sword is crossing with the drill point, be connected through strenghthened type guide post sword between the initial position of preceding guide post sword and the initial position of back guide post sword, strenghthened type guide post sword is crossing with the drill point. The utility model discloses eliminated the support neutral phase that preceding guide post sword and back guide post sword axial initial position inconsistent brought, solved and bored the in-process fluted drill guidance quality not enough, the hole site degree out of tolerance's that drills out problem.
Description
Technical Field
The utility model relates to a metal cutting especially relates to a fluted drill.
Background
At present, in order to improve the stability of drilling, a common hard alloy twist drill usually adopts a four-blade-band design, during drilling, four blades simultaneously contact with a hole wall, so that the position degree and the straightness of the hole are ensured, in the conventional four-blade-band twist drill shown in fig. 1, because a drill tip 3 has a back angle, a front guide column blade 6 and a rear guide column blade 7 have axial lag L, and as shown in fig. 2, because of the axial lag L, only the front guide column blade 6 contacts with the hole wall and the rear guide column blade 7 cannot contact with the hole wall at the initial stage of drilling (the drill depth H is less than the axial lag L), stable support cannot be formed, and a support idle stage exists.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to overcome prior art's is not enough, provides one kind and has eliminated the support neutral phase that preceding guide post sword and back guide post sword axial initial position inconsistent brought, solves to bore the twist drill guidance quality not enough of in-process, the hole site degree overproof problem of drilling.
In order to solve the technical problem, the utility model discloses a following technical scheme:
the twist drill comprises a cutting part and a handle part, wherein the cutting part comprises a drill point, a cutting edge lobe and a chip groove, a front guide column blade and a rear guide column blade are arranged on the cutting edge lobe, the starting position of the front guide column blade is intersected with the drill point, the starting position of the front guide column blade is connected with the starting position of the rear guide column blade through a reinforced guide blade, and the reinforced guide blade is intersected with the drill point.
As a further improvement of the above technical solution:
and an inner cooling hole is formed in the drill tip.
Compared with the prior art, the utility model has the advantages of:
the utility model discloses a, be connected through strenghthened type direction sword between the initial position of preceding direction post sword and the initial position of back direction post sword, strenghthened type direction sword is close to the drill point setting, at the brill initial stage, can form in succession, stable direction, thereby effectual auxiliary stay has been carried out, the support vacancy phase that preceding direction post sword and back direction post sword axial initial position inconsistent brought has been eliminated, it is not enough to solve the in-process fluted drill guidance nature of boring, the hole site degree overproof problem of drilling out, because preceding direction post sword extends to and intersects with the drill point, drilling in the twinkling of an eye preceding direction post sword can contact with the pore wall, form effective support.
Drawings
Fig. 1 is a schematic structural diagram of a twist drill in the prior art.
Fig. 2 is a schematic diagram of a prior art twist drill drilling process.
Fig. 3 is a schematic view of the twist drill according to the present invention.
Fig. 4 is a schematic view of the structure of the tip end face of the twist drill of the present invention.
Fig. 5 is an enlarged view at a in fig. 3.
Fig. 6 is a schematic view of the drilling process of the twist drill of the present invention.
The reference numerals in the figures denote:
1. a cutting portion; 2. a handle; 3. drilling a tip; 4. a land; 5. a chip pocket; 6. a front guide post blade; 7. a rear guide post blade; 8. a reinforced guide blade; 9. and (4) internal cooling holes.
Detailed Description
The invention is described in further detail below with reference to the drawings and specific examples.
As shown in fig. 3 and 6, the twist drill of the present embodiment includes a cutting portion 1 and a shank portion 2, the cutting portion 1 includes a drill tip 3, a land 4 and a chip flute 5, the land 4 is provided with a front guide post blade 6 and a rear guide post blade 7, the starting position of the front guide post blade 6 intersects with the drill tip 3, the starting position of the front guide post blade 6 is connected with the starting position of the rear guide post blade 7 through a reinforced guide blade 8, and the reinforced guide blade 8 intersects with the drill tip 3.
As shown in fig. 6, during drilling, the drill tip 3 contacts with the workpiece first, then the front guide cylindrical blade 6 also starts to contact with the workpiece due to the front end of the front guide cylindrical blade 6 in the rotation direction, then the reinforced guide cylindrical blade 8 contacts with the workpiece, and finally the rear guide cylindrical blade 7 also contacts with the workpiece, so far, the rear guide cylindrical blade 7 and the front guide cylindrical blade 6 together form a four-point support, thereby ensuring the guidance during initial drilling. The setting of strenghthened type direction sword 8 can form continuous, stable direction at the initial stage of boring to carry out effectual auxiliary stay, eliminated preceding guide post sword 6 and the inconsistent support off-the-shelf period that brings of 7 axial initial positions of back guide post sword, solve and bore the in-process fluted drill guidance quality not enough, the hole site degree of boring out poor problem. Because the front guide column blade 6 extends to intersect with the drill tip 3, the front guide column blade 6 can contact with the hole wall at the moment of drilling, and effective support is formed.
In this embodiment, the drill tip 3 is provided with an inner cooling hole 9. Two internal cooling holes 9 are provided for cooling the drill tip 3 during cutting.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The technical solution of the present invention can be used by anyone skilled in the art to make many possible variations and modifications, or to modify equivalent embodiments, without departing from the scope of the technical solution of the present invention, using the technical content disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention should fall within the protection scope of the technical solution of the present invention.
Claims (2)
1. A twist drill comprising a cutting portion (1) and a shank portion (2), the cutting portion (1) comprising a drill tip (3), a land (4) and a chip flute (5), the land (4) being provided with a leading post edge (6) and a trailing post edge (7), the leading post edge (6) having a starting position which intersects the drill tip (3), characterized in that: the starting position of the front guide column blade (6) is connected with the starting position of the rear guide column blade (7) through a reinforced guide blade (8), and the reinforced guide blade (8) is intersected with the drill point (3).
2. A twist drill according to claim 1, wherein: an inner cooling hole (9) is arranged on the drill tip (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922016819.8U CN211135657U (en) | 2019-11-20 | 2019-11-20 | Twist drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922016819.8U CN211135657U (en) | 2019-11-20 | 2019-11-20 | Twist drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211135657U true CN211135657U (en) | 2020-07-31 |
Family
ID=71773563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922016819.8U Active CN211135657U (en) | 2019-11-20 | 2019-11-20 | Twist drill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211135657U (en) |
-
2019
- 2019-11-20 CN CN201922016819.8U patent/CN211135657U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |