CN2576390Y - Broken-proof central drill - Google Patents
Broken-proof central drill Download PDFInfo
- Publication number
- CN2576390Y CN2576390Y CN 02254999 CN02254999U CN2576390Y CN 2576390 Y CN2576390 Y CN 2576390Y CN 02254999 CN02254999 CN 02254999 CN 02254999 U CN02254999 U CN 02254999U CN 2576390 Y CN2576390 Y CN 2576390Y
- Authority
- CN
- China
- Prior art keywords
- drill
- breaking
- type
- centre
- centre drill
- 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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- Drilling Tools (AREA)
Abstract
The utility model relates to a broken-proof central drill which is characterized in that a cylindrical hole used for assembling a twist drill is arranged in a body of the central drill, and the body is provided with a screw hole and screws for fixing the twist drill. When the utility model is used for drilling, the twist drill is used for drilling holes, and a conical head part of the broken-proof central drill is used for expanding hole or countersinking hole.
Description
This utility model relates to a kind of centre drill, more properly says to be a kind of hollow anti-breaking centre drill.
The centre drill of present common use because of being subjected to the influence of lathe precision and factors such as workpiece material and cutting speed, being easy to generate during centering and fractureing in process, causes the difficulty in workpiece rehabilitation center hole and the waste of workpiece material and centre drill.
This anti-breaking centre drill is in drilling process, can prevent fractureing of centre drill bit part effectively,, can take off drill sharpening at any time when punching even drill bit is twisted off, refill in the endoporus of centre drill main body into and continue to use, be unlikely and cause scrapping of whole centre drill.
This anti-breaking centre drill is according to the principle of centre drill drilling, the conehead and the spiral bit that are bored main body by hollow center combine, during centering fluted drill being put into hollow center bores in the endoporus of main body, by the fixedly rotation of fluted drill of screw, fluted drill plays the drilling function during drilling, and the conehead that hollow center is bored main body partly plays reaming and spot-facing function.
Because of fried dough twist is drilled with helicla flute, compare with the drill bit of former centre drill during drilling, processing ease, go out bits smoothly, frangibility, centre drill do not prolong service life drill bit, cost is low, production efficiency is high.
Describe the structure and the using method of this anti-breaking centre drill in detail below in conjunction with accompanying drawing:
As Fig. 1, Fig. 2, Fig. 3,1 is the endoporus of this anti-breaking centre drill, and 2 is flute, and 3 is the taper angle main cutting edge, 4 is the main body of this anti-breaking centre drill, 5 is screw hole, and 6 is 120 ° Type B tapering face, and 7 is 60 ° A type tapering face, 8 for having the cutting edge of spot-facer shape, 9 is cutting slot, and 10 is fluted drill, and 11 is hold-down screw.
The flute of the conehead part of this anti-breaking centre drill can be the straight trough type, it also can be spiral flute type, taper angle can be 60 ° an A type, it also can one be 60 ° A type, the other end is the Type B (as Fig. 1) that has 120 ° cone angle, also can be 90 ° the special type that is applicable to the clamping heavy workpiece, the main cutting edge flute of cone angle also can design the flute (as Fig. 2) of imaging spot-facer.
This anti-breaking centre drill is when drill centers, the fluted drill threading need only be had in the endoporus in the gap that necessarily is slidingly matched, be screwed fluted drill, then this centre drill main body be put into drill chuck head, again drill chuck head is put in tail stock or the drill press spindle taper hole centre bore of the part of just can doing manual work.
This anti-breaking centre drill is simple in structure, easy to operate, and use cost is low, and high efficiency brings certain help will for the processing and manufacturing of mechanical processing industry.
Claims (3)
1, anti-breaking centre drill is characterized in that: the main center of anti-breaking centre drill is provided with the cylindrical hole of assembling fluted drill, and is provided with screw hole and the screw of fixing its fluted drill on main body.
2, anti-breaking centre drill according to claim 1, its feature are also that the cone angle of this anti-breaking centre drill has A type, Type B and A, Type B is dual-purpose and four kinds of 90 ° special types.
3, according to claim 1,2 described anti-breaking centre drills, its feature is that also the cone angle flute of this anti-breaking centre drill has three kinds on straight trough type, spiral flute type and counterbit type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02254999 CN2576390Y (en) | 2002-10-05 | 2002-10-05 | Broken-proof central drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02254999 CN2576390Y (en) | 2002-10-05 | 2002-10-05 | Broken-proof central drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2576390Y true CN2576390Y (en) | 2003-10-01 |
Family
ID=33723617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02254999 Expired - Fee Related CN2576390Y (en) | 2002-10-05 | 2002-10-05 | Broken-proof central drill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2576390Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105936019A (en) * | 2016-05-25 | 2016-09-14 | 河南许继仪表有限公司 | Lead sealing screw disassembling tool and lead sealing screw disassembling device using tool |
-
2002
- 2002-10-05 CN CN 02254999 patent/CN2576390Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105936019A (en) * | 2016-05-25 | 2016-09-14 | 河南许继仪表有限公司 | Lead sealing screw disassembling tool and lead sealing screw disassembling device using tool |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |