CN202155575U - Stepped twist drill - Google Patents
Stepped twist drill Download PDFInfo
- Publication number
- CN202155575U CN202155575U CN2011202107081U CN201120210708U CN202155575U CN 202155575 U CN202155575 U CN 202155575U CN 2011202107081 U CN2011202107081 U CN 2011202107081U CN 201120210708 U CN201120210708 U CN 201120210708U CN 202155575 U CN202155575 U CN 202155575U
- Authority
- CN
- China
- Prior art keywords
- edge
- sword
- twist drill
- stepped twist
- utility
- Prior art date
- 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.)
- Expired - Fee Related
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Abstract
The utility model relates to a stepped twist drill, which comprises an edge and a handle. The stepped twist drill is characterized in that the edge includes a first edge and a second edge, the first edge is arranged at the front end of the edge, the diameter of the first edge is smaller than that of the second edge arranged behind the root of the first edge, a transitional edge is arranged between the first edge and the second edge, and the edge angle of the transitional edge is 45 degrees. By the aid of the stepped twist drill, small holes and larger through holes can be formed by only drilling once, so that operating efficiency is improved greatly.
Description
Technical field
The utility model relates to a kind of aperture knife tool, particularly a kind of step fluted drill.
Background technology
Traditional straight shank twist drill, drill bit only have a kind of specification, during boring; Be merely able to accomplish the bore operation of single size, when on the basis of aperture, accomplishing larger-diameter through hole operation, need to change larger-size drill bit; Carry out secondary drilling, so just need twice operation, efficient is lower.
The utility model content
In order to overcome above-mentioned shortcoming, the utility model provides a kind of step fluted drill.
The technical scheme of the utility model is: a kind of step fluted drill, constitute by blade and shank, and it is characterized in that said blade is divided into two-stage, comprise the one-level sword that is arranged at front end, its diameter is less than the secondary sword that is arranged at behind the one-level sword root; Be provided with transitional edges between said one-level sword and the secondary sword, the basil of transitional edges is 45 °.
The beneficial effect of the utility model is: aperture only can be accomplished through a bore operation with bigger through hole, and operating efficiency improves greatly.
Description of drawings
Fig. 1 is the utility model structure chart.
The specific embodiment
By shown in Figure 1, the embodiment of the utility model is following:
The step fluted drill is made up of two-stage blade and shank 4; Said blade comprises the one-level sword 1 that is arranged at leading portion, be arranged at the secondary sword 2 behind the one-level sword root and be arranged at the transitional edges 3 between the I and II sword; The diameter d 1 of one-level sword 1 is less than the diameter d 2 of secondary sword 2; Its ratio is set to d1:d2=0.785:1, and the basil of transitional edges 3 is set to 45 °.
Claims (1)
1. a step fluted drill is made up of blade and shank, it is characterized in that, said blade is divided into two-stage, comprises the one-level sword that is arranged at front end, and its diameter is less than the secondary sword that is arranged at behind the one-level sword root; Be provided with transitional edges between said one-level sword and the secondary sword, the basil of transitional edges is set to 45 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202107081U CN202155575U (en) | 2011-06-21 | 2011-06-21 | Stepped twist drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202107081U CN202155575U (en) | 2011-06-21 | 2011-06-21 | Stepped twist drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202155575U true CN202155575U (en) | 2012-03-07 |
Family
ID=45763224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202107081U Expired - Fee Related CN202155575U (en) | 2011-06-21 | 2011-06-21 | Stepped twist drill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202155575U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102717113A (en) * | 2012-05-25 | 2012-10-10 | 徐州中矿金海泵业有限公司 | Process for machining vent hole of pipe die of cast pipe |
| CN104190968A (en) * | 2014-08-01 | 2014-12-10 | 常州创伟工具制造有限公司 | Levorotation single-edged cutter |
-
2011
- 2011-06-21 CN CN2011202107081U patent/CN202155575U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102717113A (en) * | 2012-05-25 | 2012-10-10 | 徐州中矿金海泵业有限公司 | Process for machining vent hole of pipe die of cast pipe |
| CN104190968A (en) * | 2014-08-01 | 2014-12-10 | 常州创伟工具制造有限公司 | Levorotation single-edged cutter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120307 Termination date: 20120621 |