CN203171035U - Stepped drill - Google Patents
Stepped drill Download PDFInfo
- Publication number
- CN203171035U CN203171035U CN 201320200228 CN201320200228U CN203171035U CN 203171035 U CN203171035 U CN 203171035U CN 201320200228 CN201320200228 CN 201320200228 CN 201320200228 U CN201320200228 U CN 201320200228U CN 203171035 U CN203171035 U CN 203171035U
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- CN
- China
- Prior art keywords
- sword
- boring
- blade
- drill
- cutting edge
- 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 aims to provide a stepped drill good in drilling quality. The stepped drill comprises a drill shank and an edge portion arranged at the end of the drill shank. The stepped drill is characterized in that spiral drilling edges and platy cutting edges extending along the axial direction of the edge portion are arranged at intervals successively at the position from the end of the edge portion to the connection position between the edge portion and the drill shank, diameters of the adjacent drilling edges increase successively from the end of the edge portion to the drill shank, and the diameters of the cutting edges are identical to the diameters of the drilling edges at the front ends of the cutting edges. According to the stepped drill, the cutting edges are arranged, so that too many burrs of hole walls caused by the successively-increasing drilling edges can be prevented, and the drilling quality is guaranteed.
Description
Technical field
The utility model belongs to the bit technique field, specially refers to the good step drill of a kind of drilling quality.
Background technology
In order to get out the boring that diameter is bigger, people can adopt step drill.Step drill is provided with the boring sword that some sections diameters enlarge successively, can avoid because directly adopting the big boring sword of diameter, and is stressed excessive between cause holing sword and the material to be holed, and it is damaged that the contact position of material and drill bit is taken place, and influences the effect of holing.But, present step drill is when boring, some burrs can appear in the hole wall of boring, like this in follow-up reaming process, can occur stress between the bigger boring sword of burr and diameter concentrates, cause the burr place stressed bigger, further aggravate the roughness of hole wall, and then make follow-up boring be difficult to the effect that reaches desirable.
The utility model content
The purpose of this utility model is to propose the good step drill of a kind of drilling quality.
Cold brill comprises drillstock and the blade that is installed in the drillstock end in of the present utility model, the end that key is described blade to the joint of blade and drillstock is arranged at intervals with spiral helicine boring sword and successively along the axially extended tabular cutting edge of blade, and the diameter of adjacent boring sword is increased successively by the end of the blade direction to drillstock, and the diameter of described cutting edge is identical with the boring sword diameter of its front end.
In boring procedure, the spiral helicine boring sword of blade end is at first realized boring, along with going deep into of drill bit, can contact with the material of boring along the axially extended tabular cutting edge of blade, smoother with the hole wall surface cutting in the hole of boring, the boring sword that the diameter of this cutting edge rear end is bigger then continues boring, boring sword, cutting edge contact with hole wall successively like this,--------hole wall is cut in boring----to the cutting hole wall to make that whole boring procedure is as follows: boring ... avoid the bigger boring sword of hole wall burr and diameter to contact, caused the drilling quality bad.
Further, the boring sword joint chamfered transition of described cutting edge and its rear end, place, described inclined-plane is provided with spiral helicine auxiliary bore hole sword, and the inclination angle of described auxiliary bore hole sword (being auxiliary bore hole sword and the angle of boring between the material) is less than the inclination angle (namely hole sword and the angle of holing between the material) of the boring sword of its rear end.Like this after cutting edge cutting hole wall surface, the auxiliary bore hole sword can be holed, because the inclination angle of auxiliary bore hole sword is less, therefore the active force between auxiliary bore hole sword and the hole wall is smaller, can avoid increasing suddenly because of the active force that directly adopts diameter and the bigger boring sword in inclination angle to cause holing between sword and the hole wall, make hole wall produce too much burr.
Step drill of the present utility model is by arranging cutting edge, and the boring sword that can avoid enlarging successively causes the hole wall burr too much, thereby has guaranteed the quality of boring.
Description of drawings
Fig. 1 is the structural representation of step drill of the present utility model.
The specific embodiment
Contrast accompanying drawing below, by the description to embodiment, the effect of the mutual alignment between the shape of the specific embodiment of the present utility model such as related each member, structure, the each several part and annexation, each several part and operation principle etc. are described in further detail.
Embodiment 1:
As shown in Figure 1, the step drill of present embodiment comprises drillstock 1 and is installed in the blade 2 of drillstock 1 end, the end of described blade 2 to the joint of blade 2 and drillstock 1 is arranged at intervals with spiral helicine boring sword 3 and successively along the axially extended tabular cutting edge 4 of blade, and the diameter of adjacent boring sword 3 is increased successively by the end of blade 2 direction to drillstock 1, and the diameter of described cutting edge 4 is identical with boring sword 3 diameters of its front end.
In boring procedure, the spiral helicine boring sword 3 of blade end is at first realized boring, along with going deep into of drill bit, can contact with the material of boring along the axially extended tabular cutting edge 4 of blade, smoother with the hole wall surface cutting in the hole of boring, the boring sword 3 that the diameter of these cutting edge 4 rear ends is bigger then continues boring, like this boring sword 3, cutting edge 4 contacts with hole wall successively,--------hole wall is cut in boring----to the cutting hole wall to make that whole boring procedure is as follows: boring ... avoid the bigger boring sword 3 of hole wall burr and diameter to contact, caused the drilling quality bad.
Further, the boring sword 3 joint chamfered transition of described cutting edge 4 and its rear end, 5 places, described inclined-plane are provided with spiral helicine auxiliary bore hole sword 6, and the inclination angle of described auxiliary bore hole sword 6 is less than the inclination angle of the boring sword 3 of its rear end.Like this after cutting edge 4 cutting hole wall surfaces, auxiliary bore hole sword 6 can be holed, because the inclination angle of auxiliary bore hole sword 6 is less, therefore the active force between auxiliary bore hole sword 6 and the hole wall is smaller, can avoid increasing suddenly because of the active force that directly adopts diameter and the bigger boring sword 3 in inclination angle to cause holing between sword 3 and the hole wall, make hole wall produce too much burr.
Claims (2)
1. step drill, comprise drillstock and the blade that is installed in the drillstock end, the end that it is characterized in that described blade to the joint of blade and drillstock is arranged at intervals with spiral helicine boring sword and successively along the axially extended tabular cutting edge of blade, and the diameter of adjacent boring sword is increased successively by the end of the blade direction to drillstock, and the diameter of described cutting edge is identical with the boring sword diameter of its front end.
2. step drill according to claim 1 is characterized in that the boring sword joint chamfered transition of described cutting edge and its rear end, and place, described inclined-plane is provided with spiral helicine auxiliary bore hole sword, and the inclination angle of described auxiliary bore hole sword is less than the inclination angle of the boring sword of its rear end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320200228 CN203171035U (en) | 2013-04-19 | 2013-04-19 | Stepped drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320200228 CN203171035U (en) | 2013-04-19 | 2013-04-19 | Stepped drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203171035U true CN203171035U (en) | 2013-09-04 |
Family
ID=49067789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320200228 Expired - Fee Related CN203171035U (en) | 2013-04-19 | 2013-04-19 | Stepped drill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203171035U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104107935A (en) * | 2013-04-19 | 2014-10-22 | 苏州文鼎模具有限公司 | Stepped drill |
| CN107378009A (en) * | 2017-08-01 | 2017-11-24 | 大连理工大学 | A kind of micro- serrated knife tool of multi-ladder multiple-cutting-edge gradual change for carbon fibre composite drilling |
-
2013
- 2013-04-19 CN CN 201320200228 patent/CN203171035U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104107935A (en) * | 2013-04-19 | 2014-10-22 | 苏州文鼎模具有限公司 | Stepped drill |
| CN107378009A (en) * | 2017-08-01 | 2017-11-24 | 大连理工大学 | A kind of micro- serrated knife tool of multi-ladder multiple-cutting-edge gradual change for carbon fibre composite drilling |
| CN107378009B (en) * | 2017-08-01 | 2019-04-09 | 大连理工大学 | A kind of micro- serrated knife tool of multi-ladder multiple-cutting-edge gradual change for carbon fibre composite drilling |
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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: 20130904 Termination date: 20140419 |