CN203843246U - Threaded-connection-type lengthened drill bit - Google Patents
Threaded-connection-type lengthened drill bit Download PDFInfo
- Publication number
- CN203843246U CN203843246U CN201420293778.1U CN201420293778U CN203843246U CN 203843246 U CN203843246 U CN 203843246U CN 201420293778 U CN201420293778 U CN 201420293778U CN 203843246 U CN203843246 U CN 203843246U
- Authority
- CN
- China
- Prior art keywords
- drill bit
- caudal peduncle
- hole
- threaded
- connection
- 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 - Lifetime
Links
- 238000005553 drilling Methods 0.000 abstract description 10
- 238000003754 machining Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000028514 leaf abscission Effects 0.000 description 1
Landscapes
- Earth Drilling (AREA)
Abstract
The utility model discloses a threaded-connection-type lengthened drill bit, and relates to a drill bit, in particular to a drill bit for machining a locking pin hole in the blade root position of a steam turbine. The threaded-connection-type lengthened drill bit aims to solve the problem that the locking pin hole in the blade root position of a blade of the steam turbine is difficult to machine. The threaded-connection-type lengthened drill bit is composed of a drill bit body and a tail shank, the tail shank is a short Morse taper shank, an inner hole and a thread hole are sequentially formed in the body of the tail shank from front to back, an outer circular body matched with the inner hole of the tail shank is arranged on the rear surface of the main body of the drill bit body, the rear surface of the outer circular body is connected with an external thread matched with the thread hole of the tail shank, and the drill bit body is connected with the tail shank through threads. By the adoption of the threaded-connection-type lengthened drill bit, drill bits different in size can be replaced conveniently, and the locking pin hole can be formed through two times of drilling.
Description
Technical field
The utility model relates to a kind of drill bit, is specifically related to for processing the drill bit of steam turbine blade root place locking pin-and-hole.
Background technology
Turbine rotor and turbine blade are two vitals of steam-turbine unit, after blade assembling, need to process at blade root place locking pin-and-hole, and utilize straight pin by blade lock stressed joint on rotor disk, as it is bad to lock pin-and-hole machining accuracy, to affect blade assembly precision, reduce blade bonding strength, have the potential safety hazard of leaf abscission rotor disk.Very narrow because of impeller spacing at different levels, must process with specific Deflection drill.But for the thicker deep hole of impeller, in small space, cannot a drilling completing, is the processing difficult problem that need solve.
Utility model content
The purpose of this utility model is in order to solve the problem of the locking pin-and-hole processing difficulties at turbine blade root place, and a kind of screw connected lengthening drill bit is provided.
The screw connected lengthening drill bit of the utility model is comprised of drill bit and caudal peduncle, caudal peduncle is the short taper shank of Mohs, in caudal peduncle body, have successively from front to back endoporus and screwed hole, after drill main body, be provided with the outer circle coordinating with caudal peduncle endoporus, after circle, be connected with outside the external screw thread coordinating with caudal peduncle screwed hole, drill bit and caudal peduncle are threaded connection.
Screw connected lengthening drill bit described in the utility model is comprised of drill bit and caudal peduncle two parts, these two parts removably connect by screw thread, for the thicker deep hole of impeller, adopt drilling processing mode twice, the certain hole depth of stub drill drilling is first installed, lengthening drill bit is installed again, locking pin hole drilling, to projected depth, has been solved to a processing difficult problem for turbine blade root place locking pin-and-hole.
Accompanying drawing explanation
Fig. 1 is the front view of caudal peduncle;
Fig. 2 is the top view of caudal peduncle;
Fig. 3 is the front view of drill bit;
Fig. 4 is the left view of drill bit;
Fig. 5 is the installation diagram of screw connected lengthening drill bit.
The specific embodiment
The specific embodiment one: the screw connected lengthening drill bit of present embodiment is comprised of drill bit 1 and caudal peduncle 2, caudal peduncle is the short taper shank of Mohs, in caudal peduncle body, have successively from front to back endoporus 2-1 and screwed hole 2-2, after drill main body, be provided with the outer circle 1-2 coordinating with caudal peduncle endoporus, after circle, be connected with outside the external screw thread 1-1 coordinating with caudal peduncle screwed hole, drill bit 1 is threaded connection with caudal peduncle 2.
With the short cone location and installation of Mohs externally in Deflection drill taper hole, adopt twice drilling mode to process the locking pin-and-hole at turbine blade root place the caudal peduncle of the screw connected lengthening drill bit of present embodiment.
The specific embodiment two: what present embodiment was different from the specific embodiment one is that caudal peduncle 2 is No. 2 short taper shanks of Mohs.
The specific embodiment three: present embodiment is different from the specific embodiment one or two is that the length of caudal peduncle 2 is 65mm.
Present embodiment adopts tang structure for transmitting torque, facilitates installing/dismounting drill bit.
The specific embodiment four: what present embodiment was different from one of specific embodiment one to three is that drill bit 1 is two toothings, and right hand helix angle is 30 °, and taper lead angle a is 118 °.
Embodiment mono-: the screw connected lengthening drill bit of the present embodiment is comprised of drill bit 1 and caudal peduncle 2, caudal peduncle 2 is No. 2 short taper shanks of Mohs, in caudal peduncle body, have successively from front to back endoporus 2-1 and screwed hole 2-2, after drill main body, be provided with the outer circle 1-2 coordinating with caudal peduncle endoporus, after circle 1-2, be connected with outside the external screw thread 1-1 coordinating with caudal peduncle screwed hole, drill bit 1 is threaded connection with caudal peduncle 2.
The present embodiment drill bit 1 is two toothings, and right hand helix angle is 30 °, and taper lead angle is 118 °, 12 ° of cutting cone place relief angles, and drill bit rear portion flat, coordinates with external key, for installing/dismounting drill bit.The length of caudal peduncle 2 is 65mm, and diameter of bore is 10mm, and screwed hole is M8.
By screw connected lengthening drill bit location and installation externally in Deflection drill taper hole, adopt the locking pin-and-hole at twice drilling processing turbine blade root place, stub drill drilling is first installed to 50mm hole depth, more screw connected lengthening drill bit is installed, by locking pin hole drilling to the 80mm degree of depth.Because impeller spacing is very narrow, for the thicker deep hole of impeller, in small space, there is no mounting cutter space, cannot carry out Drilling operation, by the lengthening drill bit of designing requirement hole depth, cannot process at one time, and take this screw connected lengthening drill bit can be convenient for changing the drill bit of different size, be convenient to lock the processing of pin-and-hole.
Claims (4)
1. a screw connected lengthening drill bit, it is characterized in that screw connected lengthening drill bit is comprised of drill bit (1) and caudal peduncle (2), caudal peduncle (2) is the short taper shank of Mohs, in caudal peduncle body, have successively from front to back endoporus (2-1) and screwed hole (2-2), after drill main body, be provided with the outer circle (1-2) coordinating with caudal peduncle endoporus, after circle, be connected with outside the external screw thread (1-1) coordinating with caudal peduncle screwed hole, drill bit (1) is threaded connection with caudal peduncle (2).
2. a kind of screw connected lengthening drill bit according to claim 1, is characterized in that caudal peduncle (2) is No. 2 short taper shanks of Mohs.
3. a kind of screw connected lengthening drill bit according to claim 1, the length that it is characterized in that caudal peduncle (2) is 65mm.
4. a kind of screw connected lengthening drill bit according to claim 1, is characterized in that drill bit (1) is two toothings, and right hand helix angle is 30 °, and taper lead angle a is 118 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420293778.1U CN203843246U (en) | 2014-06-04 | 2014-06-04 | Threaded-connection-type lengthened drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420293778.1U CN203843246U (en) | 2014-06-04 | 2014-06-04 | Threaded-connection-type lengthened drill bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203843246U true CN203843246U (en) | 2014-09-24 |
Family
ID=51556307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420293778.1U Expired - Lifetime CN203843246U (en) | 2014-06-04 | 2014-06-04 | Threaded-connection-type lengthened drill bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203843246U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107900390A (en) * | 2017-12-05 | 2018-04-13 | 沈阳航天新光集团有限公司 | The processing method of high-temperature alloy steel slightness hole |
| CN109530532A (en) * | 2017-09-21 | 2019-03-29 | 吉林省正轩车架有限公司 | Interior high-pressure molding while punching part quick change multipart punch |
-
2014
- 2014-06-04 CN CN201420293778.1U patent/CN203843246U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109530532A (en) * | 2017-09-21 | 2019-03-29 | 吉林省正轩车架有限公司 | Interior high-pressure molding while punching part quick change multipart punch |
| CN107900390A (en) * | 2017-12-05 | 2018-04-13 | 沈阳航天新光集团有限公司 | The processing method of high-temperature alloy steel slightness hole |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203843246U (en) | Threaded-connection-type lengthened drill bit | |
| CN206653004U (en) | The accurate drilling tool of cylindrical workpiece side wall | |
| CN201931131U (en) | Compound tool for hole slot processing | |
| CN204920795U (en) | Combined broaching bit for mine | |
| CN203401121U (en) | Countersinking and reaming composite cutter for solid carbide drill | |
| CN203900659U (en) | Drilling-tapping integrated combined tap | |
| CN205342091U (en) | Roll over and use assembled reamer to boring | |
| CN202162422U (en) | Step twist drill | |
| CN210908236U (en) | Ball drill for machining split rotor connecting hole | |
| CN203448734U (en) | Compound tool | |
| CN111058772B (en) | Eccentric drilling tool | |
| CN204277004U (en) | A kind of novel precise drilling drill bit | |
| CN203610728U (en) | Positioning structure of drill plate | |
| CN203843538U (en) | Drill tool for connection between empennage frame and rear section of jet tube in missile tail | |
| CN206703215U (en) | A kind of Three-tip woodwork drill | |
| CN205342026U (en) | Fluted drill in processing hole | |
| CN102837042A (en) | Stepped twist drill | |
| CN102011553A (en) | Double-helix drill bit of rotary drilling rig | |
| CN203140850U (en) | Hollow boring bit | |
| CN204449428U (en) | Chip-removal drill bit in a kind of | |
| CN203696076U (en) | Threaded shank milling cutter for machining magnesium alloy | |
| CN105234465A (en) | Bidirectional chamfering countersink drill | |
| CN207272254U (en) | A kind of assembled circular arc blade tip reamer | |
| CN203030988U (en) | Step drill | |
| CN104625254A (en) | Composite threaded tool and thread machining method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140924 |