CN202726137U - Novel flat-bottom hole drill - Google Patents
Novel flat-bottom hole drill Download PDFInfo
- Publication number
- CN202726137U CN202726137U CN2012202659537U CN201220265953U CN202726137U CN 202726137 U CN202726137 U CN 202726137U CN 2012202659537 U CN2012202659537 U CN 2012202659537U CN 201220265953 U CN201220265953 U CN 201220265953U CN 202726137 U CN202726137 U CN 202726137U
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- CN
- China
- Prior art keywords
- drill
- degrees
- bottom hole
- hole drill
- flat
- 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 novel flat-bottom hole drill comprising a twist drill. A core-bit is arranged at the lower end of the twist drill. Two straight cutting edges are symmetrically arranged on both sides of the core-bit. An anterior angle of the flat-bottom hole drill is 2 degrees to 5 degrees and a relief angle of the flat-bottom hole drill is 2 degrees to 3 degrees. A concave gap is arranged on each of the cutting edges. According to the novel flat-bottom hole drill, the twist drill is ground into a straight and symmetrical cutting edge and the relief angle of the drill is only 2 degrees to 3 degrees. And therefore a stab of a blade and a break off of a drill point are avoided. Centering of the core-bit is adopted to drill a hole smoothly and the concave gaps are capable of reducing the cutting resistance. The novel flat-bottom hole drill has the advantages that the structure is simple, the manufacture is convenient and the flat-bottom machining can be achieved according to the requirement of a workpiece.
Description
Technical field
The utility model relates to a kind of drill bit, specifically a kind of novel flat hole drill.
Background technology
In a lot of the application, the Kong Caineng that end of formation is planar base surface in workpiece meets the requirements.At present, the cutting element of many types and drilling system are developed in the application of the flat hole drill of processing.The skiver that prior art is designed for the processing flat-bottom hole has a lot of shortcomings, often occur collapsing on some points on the drill bit or line and decrease or crackle, and drilling is not steady.
Summary of the invention
In order to address the above problem, it is a kind of with unbearable centering that the utility model provides, and makes stably flat hole drill of drilling.
In order to achieve the above object, the utility model is achieved through the following technical solutions:
The utility model is a kind of novel flat hole drill, comprises fluted drill, is unbearable in the lower end of fluted drill, is symmetrical two the straight cutting edges that arrange in the lower end of fluted drill, unbearable both sides, at each cutting edge one concave indentation is set.
Further improvement of the utility model is: the anterior angle of flat hole drill is worn into 2 °-5 °, and the relief angle of flat hole drill is worn into 2 °-3 °.
The beneficial effects of the utility model are: the utility model is worn into straight and symmetrical cutting edge with fluted drill, and relief angle only is 2 °-3 °, prevents knife, avoid the broken drill accident, by unbearable centering, make drilling steady, the concave indentation that on cutting edge, arranges, the resistance when having reduced cutting.
The utility model is simple in structure, and is easy to make, finishes flat processing according to the needs of workpiece.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Structural representation when Fig. 2 is the utility model drilling.
Wherein: the 1-fluted drill, 2-is unbearable, 3-cutting edge, 4-concave indentation.
The specific embodiment
In order to deepen that understanding of the present utility model is described in further detail the utility model below in conjunction with drawings and Examples, this embodiment only is used for explaining the utility model, protection domain of the present utility model is not consisted of to limit.
The utility model is a kind of novel flat hole drill, comprise fluted drill 1, lower end at described fluted drill 1 is unbearable 2, be symmetrical two the straight cutting edges 3 that arrange in the lower end of described fluted drill 1, described unbearable 2 both sides, at described each cutting edge 3 concave indentation 4 is set, the anterior angle of described flat hole drill is worn into 2 °-5 °, and the relief angle of described flat hole drill is worn into 2 °-3 °.The utility model is worn into straight and symmetrical cutting edge with fluted drill, and relief angle only is 2 °-3 °, prevents knife, avoids the broken drill accident, by unbearable centering, makes drilling steady, and the concave indentation 4 that arranges on the cutting edge 3 has reduced cutting resistance.
The utility model is simple in structure, and is easy to make, finishes flat processing according to the needs of workpiece.
Claims (2)
1. novel flat hole drill, comprise fluted drill (1), lower end at described fluted drill (1) is unbearable (2), it is characterized in that: in the lower end of described fluted drill (1), the both sides of described unbearable (2) are symmetrical two the straight cutting edges (3) that arrange, and at described each cutting edge (3) concave indentation (4) are set.
2. described a kind of novel flat hole drill according to claim 1, it is characterized in that: the anterior angle of described flat hole drill is worn into 2 °-5 °, and the relief angle of described flat hole drill is worn into 2 °-3 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202659537U CN202726137U (en) | 2012-06-07 | 2012-06-07 | Novel flat-bottom hole drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202659537U CN202726137U (en) | 2012-06-07 | 2012-06-07 | Novel flat-bottom hole drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202726137U true CN202726137U (en) | 2013-02-13 |
Family
ID=47651886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012202659537U Expired - Fee Related CN202726137U (en) | 2012-06-07 | 2012-06-07 | Novel flat-bottom hole drill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202726137U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102717128A (en) * | 2012-06-07 | 2012-10-10 | 江苏天工工具有限公司 | Novel flat-bottom hole drill |
-
2012
- 2012-06-07 CN CN2012202659537U patent/CN202726137U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102717128A (en) * | 2012-06-07 | 2012-10-10 | 江苏天工工具有限公司 | Novel flat-bottom hole drill |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20130213 Termination date: 20150607 |
|
| EXPY | Termination of patent right or utility model |