CN213729546U - Double-groove twist drill - Google Patents
Double-groove twist drill Download PDFInfo
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- CN213729546U CN213729546U CN202022729707.XU CN202022729707U CN213729546U CN 213729546 U CN213729546 U CN 213729546U CN 202022729707 U CN202022729707 U CN 202022729707U CN 213729546 U CN213729546 U CN 213729546U
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- blade
- twist drill
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Abstract
The utility model relates to a double flute fluted twist drill. The cutting tool comprises a handle part and a working part, wherein the working part is provided with two spiral grooves and two blade backs; the two blade backs are provided with blade zones and grinding parts, the width of the two blade zones is the same, the height of the two blade zones is the same, and the length of the grinding part is larger than that of the spiral groove. The utility model discloses compare with the conventional type of boring, prolonged the use length of product work portion, greatly improved the rigidity and the drilling precision cutting performance of product, the location is better, and cutting speed is faster.
Description
Technical Field
The utility model relates to a machine cutter field, specifically speaking relates to a double flute fluted twist drill.
Background
The margin is not the most critical part of the drill bit, but is an important factor affecting the drilling process. Generally one does not pay much attention to the geometrical characteristics of the margin on the cylindrical surface of the bit, and incorrectly considers: the margin has little effect on the quality of the drilled hole and, in fact, every geometrical feature of the drill bit affects the success and failure of the drilled hole. The margin is at the outermost portion of the bit, forming the outer diameter of the bit, and remains in contact with the machined surface of the hole at all times. The clearance is formed due to the land, which helps to control friction and the heat generated by friction, and in addition, the clearance allows coolant to flow into the cutting edge of the drill bit, further reducing heat generation. The cutting edge is also beneficial to stable drilling, increase the strength of the drill bit and prevent the drill bit from being adhered. In addition to these primary effects, the size, surface finish and number of lands can affect the quality and processing time of the drilled hole.
In the existing drill, the cutting edge is only a small part and is not completely ground, so that the working part of a product is short in service length, the rigidity and drilling precision of the product are low in cutting performance, and the drill cannot be effectively utilized.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the main objective is providing a double flute fluted twist drill to prolong product working part's use length, improve the rigidity and the drilling precision cutting performance of product.
In order to achieve the purpose, the utility model provides a double-groove twist drill, which comprises a handle part and a working part, wherein the working part is provided with two spiral grooves and two blade backs; the two blade backs are provided with blade zones and grinding parts, the width of the two blade zones is the same, the height of the two blade zones is the same, the length of the blade zones is equal to that of the spiral groove, and the length of the grinding parts is larger than that of the spiral groove.
Further, the handle is cylindrical or polygonal.
Furthermore, a chisel edge is arranged at the center of the top of the working part, and a cutting edge is arranged at the edge of the chisel edge.
The utility model discloses compare with the conventional type of boring, prolonged the use length of product work portion, greatly improved the rigidity and the drilling precision cutting performance of product, the location is better, and cutting speed is faster.
Drawings
Fig. 1 is the structure schematic diagram of a double-groove twist drill of the present invention.
Fig. 2 is the utility model discloses a double flute twist drill working portion point of a drill tip structure sketch map.
Fig. 3 shows the length difference of the double-flute twist drill of the present invention.
Wherein, 1-handle; 2-a working part; 21-a helical groove; 22-blade back; 221-grinding part; 222-a land; 23-a cutting edge; 24-chisel edge.
Detailed Description
To achieve the above objects and advantages, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1-3, the present invention provides a double-flute twist drill, which comprises a handle part 1 and a working part 2, wherein the working part 2 is provided with two helical flutes 21 and two blade backs 22; the two blade backs 22 are respectively provided with a blade area 222 and a grinding part 221, the width of the two blade areas 222 is the same, the height of the two blade areas 222 is the same, the length of the blade areas 222 is equal to that of the spiral groove 21, and the length of the grinding part 221 is larger than that of the spiral groove 21.
The handle 1 is cylindrical or polygonal.
The top center position of the working part 2 is provided with a chisel edge 24, and the edge of the chisel edge 24 is provided with a cutting edge 23.
The length of the grinding part 221 is longer than that of the spiral groove 21 by L, and the length of L is 1-5 mm.
The above description is only a preferred embodiment of the present invention, and not all embodiments, and any person should learn the structural changes made under the teaching of the present invention, and all the technical solutions identical or similar to the present invention all belong to the protection scope of the present invention.
Claims (3)
1. A double-groove twist drill comprises a handle part and a working part, wherein the working part is provided with two spiral grooves and two blade backs; the spiral groove cutting device is characterized in that the two blade backs are respectively provided with a blade zone and a grinding part, the width of the two blade zones is the same, the height of the two blade zones is the same, the length of the blade zones is equal to that of the spiral groove, and the length of the grinding part is larger than that of the spiral groove.
2. A double flute twist drill according to claim 1, wherein said shank portion is cylindrical or polygonal.
3. A double flute twist drill according to claim 1, wherein a chisel edge is provided at a central location of the top of the working portion, and a cutting edge is provided at an edge of the chisel edge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022729707.XU CN213729546U (en) | 2020-11-23 | 2020-11-23 | Double-groove twist drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022729707.XU CN213729546U (en) | 2020-11-23 | 2020-11-23 | Double-groove twist drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213729546U true CN213729546U (en) | 2021-07-20 |
Family
ID=76828011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022729707.XU Active CN213729546U (en) | 2020-11-23 | 2020-11-23 | Double-groove twist drill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213729546U (en) |
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2020
- 2020-11-23 CN CN202022729707.XU patent/CN213729546U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211118 Address after: 212000 Yicheng Changlu Industrial Park, danbei Town, Danyang City, Zhenjiang City, Jiangsu Province Patentee after: DANYANG KAI YI YUAN TOOLS Co.,Ltd. Address before: Yicheng Industrial Park, danbei Town, Danyang City, Zhenjiang City, Jiangsu Province Patentee before: Jiangsu Fengyuan Tools Co.,Ltd. |