CN107824910B - Internal thread helix initial angle positioner - Google Patents
Internal thread helix initial angle positioner Download PDFInfo
- Publication number
- CN107824910B CN107824910B CN201711237694.0A CN201711237694A CN107824910B CN 107824910 B CN107824910 B CN 107824910B CN 201711237694 A CN201711237694 A CN 201711237694A CN 107824910 B CN107824910 B CN 107824910B
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- hole
- limiting
- buffer
- connecting seat
- spacing
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- 238000009434 installation Methods 0.000 claims description 20
- 230000003139 buffering effect Effects 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 4
- 210000002421 cell wall Anatomy 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000003754 machining Methods 0.000 abstract description 19
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000001502 supplementing effect Effects 0.000 description 9
- 125000006850 spacer group Chemical group 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 210000000078 claw Anatomy 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 238000010030 laminating Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 208000004350 Strabismus Diseases 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G1/00—Thread cutting; Automatic machines specially designed therefor
- B23G1/44—Equipment or accessories specially designed for machines or devices for thread cutting
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connection Of Plates (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
Abstract
The invention provides an initial angle positioning device for an internal thread spiral line, and belongs to the technical field of tool clamps. The internal thread length-compensating device solves the problems of low machining precision and high rejection rate of the existing internal thread length-compensating device. This initial angle positioner of internal thread helix includes mount pad and connecting seat, and the one end of mount pad has the erection column that the arch set up, has the external screw thread on the erection column, and the other end of mount pad has the spacing post that the arch set up, has spacing hole on the connecting seat, and spacing post embedding is in spacing hole and spacing post can follow the axial slip in spacing hole, connecting seat and mount pad circumference location. The internal thread spiral line initial angle positioning device has the advantages of high processing precision and low rejection rate of the internal thread length.
Description
Technical Field
The invention belongs to the technical field of tool clamps, and relates to an internal thread spiral line start angle positioning device.
Background
In production assembly, a threaded connection is often adopted to fasten a part, so that threads are often required to be machined on a product, such as internal threads in a hole product, and threads with required lengths are machined according to requirements in the production and machining process, but after machining is finished, the lengths of the originally machined threads are insufficient due to various reasons, and the lengths of the machined threads are required to be increased.
The existing thread length supplementing method is used for supplementing the long threads by threading dies or screw taps in a sleeved mode, machining efficiency is low, and the method can only be used for threads with smaller nominal diameter and low requirements on the dimensional accuracy of the threads. The other thread length supplementing method is to supplement length turning to the thread by a numerical control lathe, but the method has higher requirements on radial freedom degree, axial freedom degree and initial angle of a spiral line of a processed workpiece, and particularly has higher requirements on consistency of three freedom degrees in mass production. In production, the consistency requirement of radial freedom degree and axial freedom degree can be realized by soft claw clamping, but because the internal thread is positioned in the workpiece and is not well observed, the initial angle of the spiral line of the internal thread is difficult to control, and the screw thread can be damaged and has high rejection rate in the thread length supplementing process.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides an internal thread helix start angle positioning device, which solves the technical problems of improving the machining precision during thread length compensation and reducing the rejection rate.
The aim of the invention can be achieved by the following technical scheme: the utility model provides an initial angle positioner of internal thread helix, includes mount pad and connecting seat, its characterized in that, the one end of mount pad has the erection column that the arch set up, have the external screw thread on the erection column, the other end of mount pad has the spacing post that the arch set up, spacing hole has on the connecting seat, spacing post embedding is in spacing hole just spacing post can follow spacing hole's axial slip in spacing hole, connecting seat and mount pad circumference location.
The internal thread helix starting angle positioning device is used for carrying out thread length supplementing processing on a workpiece with internal threads, the connecting seat is arranged on a tool turret of a machine tool, the mounting column is provided with external threads, the length of the mounting column is larger than that of the workpiece to be processed, the workpiece to be processed is rotationally connected to the mounting column and screwed, the internal thread helix starting angle in the workpiece is controlled through the mounting column, and the control precision is high, so that the processing precision is improved, and the rejection rate is reduced; and inserting a limit column of the mounting seat into a limit hole of the connecting seat, moving the cutter tower, extending the workpiece into a soft claw of the machine tool, controlling the radial freedom degree and the axial freedom degree of the workpiece through the soft claw, reversely moving the cutter tower to separate the mounting seat from the connecting seat, rotating the mounting seat to separate the workpiece from the mounting seat, and then performing thread length supplementing processing on the workpiece through a set distance of cutter movement. Every work piece is all fixed a position in the soft jack catch through mount pad, connecting seat and erection column to make the uniformity of waiting to process the work piece good, when the work piece is mending long screw thread, the cutting edge of cutter is located the trough of screw thread all the time, and the screw thread can not damage, and machining precision is high, and the disability rate is low.
In the internal thread spiral line initial angle positioning device, when the limiting column is embedded into the limiting hole, the outer side wall of the limiting column is attached to the inner side wall of the limiting hole. The mounting seat is basically tightly matched with the connecting seat, the limiting column can be embedded into the limiting hole only by applying certain external force, and the limiting column is separated from the limiting hole.
In the above-mentioned initial angle positioner of internal thread helix, the spacing groove that is rectangular shape has on the lateral wall of spacing post, the spacing groove runs through the spacing one end that the post kept away from the erection column, be equipped with the spacer pin in the connecting seat, the spacer pin can imbed in the spacing groove and make connecting seat and mount pad circumference location. The limiting groove and the limiting pin play a role in limiting and guiding, the connecting seat and the mounting seat are circumferentially positioned by matching the limiting groove and the limiting pin, the limiting groove penetrates through one end, far away from the mounting column, of the limiting column to enable the connecting seat to be separated from the mounting seat, and the connecting seat is connected with the mounting seat and is convenient to separate from the mounting seat.
In the above-mentioned initial angle positioner of internal thread helix, the both sides wall slope setting of spacing groove, the locating pin is located the part of mounting groove and has the spacing face that the slope set up, works as during spacing post embedding is in the spacing hole, spacing face laminating is on the lateral wall of spacing groove. This kind of structure increases the area of contact between spacing post and the spacer pin, improves the stability of being connected between connecting seat and the mount pad to improve the uniformity of the work piece of screw thread fixedly connected on the mount post, improve the machining precision when the long screw thread of work piece benefit, reduce the disability rate.
In the above-mentioned initial angle positioning device of internal thread helix, the mount pad still includes the installation department, the erection column is located the centre department of installation department one side, the spacing post is located the centre department of installation department opposite side, works as when spacing post is embedded into in the spacing hole, the installation department part protrusion is outside the connecting seat. The installation department part protrusion is outside the connecting seat, makes things convenient for the operator to snatch the installation department, and makes things convenient for the operator to insert spacing post in spacing hole, makes connecting seat and mount pad link to each other conveniently, improves machining efficiency.
In the internal thread helix start angle positioning device, a tangential plane is provided on an outer sidewall of the mounting portion. The tangent plane plays the effect of sign, reminds the operator to connect the position of putting of seat, makes things convenient for the operator to aim at, makes connecting seat and mount pad link to each other conveniently, improves machining efficiency.
In the internal thread spiral line initial angle positioning device, the mounting portion is provided with a mounting groove, and the mounting column is located in the middle of the mounting groove. The setting of mounting groove makes the erection column processing convenient, and the erection column can not too outside the installation department in addition, improves the machining precision of erection column to improve the installation precision of work piece, make the circumference degree of freedom of work piece unanimous, improve machining precision, reduce the disability rate.
In the initial angle positioning device of internal thread helix, the locating hole that runs through to the spacing hole has in the connecting seat, the junction of locating hole and spacing hole is equipped with keeps off along, the locating pin wears to establish in the locating hole, still be equipped with spacing spring and spacing end cap in the locating hole, the one end that spacing hole was kept away from to spacing end cap shutoff locating hole, spacing spring one end supports and leans on the locating pin, spacing spring's the other end supports and leans on spacing end cap, spacing spring makes the locating pin can support and leans on along and make partial locating pin be located the locating hole. Under the effect of spring force, the spacer pin part is embedded into the spacing groove, and the position of spacer pin can finely tune according to actual need promptly to make connecting seat and mount pad circumference location's stability good, the connecting seat can not squint the settlement position, and the installation accuracy of connecting seat is high, thereby improves the uniformity of waiting to process the work piece, improves the machining precision when work piece screw thread mends long, reduces the disability rate.
In the above-mentioned initial angle positioner of internal thread helix, still have the buffer hole on the connecting seat, be equipped with buffer spring and buffering locating pin in the buffer hole, have the buffer groove on the lateral wall of buffering locating pin, have the buffer lug on the inside wall of buffer hole, the buffer lug part is embedded into the buffer groove, buffer spring's one end supports and leans on the connecting seat, buffer spring's the other end supports and leans on the buffering locating pin buffer spring elastic force down the buffer lug can support on the cell wall of buffer groove. The buffer lug makes the buffer locating pin not drop from the buffer hole, and under the effect of buffer spring elasticity, the buffer locating pin plays the cushioning effect, and the work piece can not take place hard collision with soft jack catch, improves the installation accuracy of work piece to improve the machining precision of work piece.
In the above-mentioned initial angle positioner of internal thread helix, the connecting seat includes first connecting portion and second connecting portion, spacing hole, locating hole and buffer hole all are arranged in first connecting portion, second connecting portion are arranged in the centre department of first connecting portion one side, spacing hole is arranged in the centre department of first connecting portion opposite side, the locating hole is arranged in the top of spacing hole, the buffer hole is located the below of spacing hole, the opening orientation of spacing hole and buffer hole is the same. The locating hole is located the top in spacing hole, and under spacing spring's elasticity and the dual effect of locating pin self gravity, partial locating pin can be better imbed in the spacing groove, improves the stability of connecting seat installation to improve the uniformity of the work piece that the screw thread links firmly on the erection column, improve the machining precision when the long screw thread is mended to the work piece, reduce the disability rate.
Compared with the prior art, the internal thread helix start angle positioning device provided by the invention has the following advantages:
1. the connecting seat of the internal thread spiral line initial angle positioning device is provided with the mounting column with external threads in a protruding mode, the circumferential freedom degree of the workpiece to be processed is controlled through the mounting column, the consistency of each workpiece after positioning is good, the edge of the cutter is always located in the trough of the screw thread when the workpiece is subjected to long thread supplementing, the screw thread cannot be damaged, and the processing precision is high, so that the rejection rate of the workpiece is reduced.
2. This initial angle positioner's of internal thread helix connecting seat and mount pad circumference location, and connecting seat and mount pad can separate, and the cooperation through connecting seat and mount pad makes the uniformity after every work piece location good, and the time shift sword tower can make connecting seat and mount pad separate mutually during processing, and the work piece is when mending long screw thread, and the cutting edge of cutter is located the trough of screw thread all the time, and the screw thread can not damage, and the machining precision is high to reduce the disability rate of work piece.
Drawings
Fig. 1 is a cross-sectional view of the whole structure of the internal thread helix start angle positioning device.
Fig. 2 is a cross-sectional view of the connection base of the internal thread helix start angle positioning device when connected with a workpiece.
Fig. 3 is a rear view of the connection base of the internal thread helix start angle positioning device.
Fig. 4 is a rear view of the present internal thread helix start angle positioning device.
In the figure, 1, a mounting seat; 11. a mounting column; 12. a limit column; 13. a limit groove; 14. a mounting part; 15. cutting into sections; 16. a mounting groove; 2. a connecting seat; 21. a limiting hole; 22. a first connection portion; 23. a second connecting portion; 3. a limiting pin; 4. positioning holes; 5. a blocking edge; 6. a limit spring; 7. a limit plug; 8. buffering holes; 9. a buffer spring; 10. buffering the locating pin; 17. a buffer tank; 18. buffer bump; 19. a workpiece.
Detailed Description
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
The internal thread helix starting angle positioning device is a tool for supplementing the threads of a workpiece 19 because of the short length of the threads of the workpiece 19, and as shown in fig. 1 and 2, the internal thread helix starting angle positioning device comprises a mounting seat 1 and a connecting seat 2.
The mounting seat 1 further comprises a limit column 12 and a mounting part 14, wherein a mounting groove 16 is formed in the middle of one side of the mounting part 14, the limit column 12 is located in the middle of the other side of the mounting part 14, a mounting column 11 which is arranged in a protruding mode is arranged in the middle of the mounting groove 16, external threads are formed in the mounting column 11, and a tangential plane 15 is formed in the outer side wall of the mounting part 14. As shown in fig. 3, the outer side wall of the limiting post 12 is provided with a strip-shaped limiting groove 13, the limiting groove 13 penetrates through one end of the limiting post 12 far away from the mounting post 11, and two side walls of the limiting groove 13 are obliquely arranged.
The connecting seat 2 comprises a first connecting portion 22 and a second connecting portion 23, the first connecting portion 22 is flat, the second connecting portion 23 is columnar, a limiting hole 21, a positioning hole 4 and a buffer hole 8 are formed in the first connecting portion 22, the second connecting portion 23 is located in the middle of one side of the first connecting portion 22, the limiting hole 21 is located in the middle of the other side of the first connecting portion 22, the positioning hole 4 is located above the limiting hole 21, the buffer hole 8 is located below the limiting hole 21, and the openings of the limiting hole 21 and the buffer hole 8 face the same.
The locating hole 4 runs through to spacing hole 21, the junction of locating hole 4 and spacing hole 21 is equipped with keeps off along 5, spacer pin 3 wears to establish in locating hole 4, still be equipped with spacing spring 6 and spacing end cap 7 in the locating hole 4, spacing end cap 7 shutoff locating hole 4 is kept away from the one end of spacing hole 21, spacing spring 6 one end supports and leans on spacer pin 3, spacing spring 6's the other end supports and leans on spacing end cap 7, spacing spring 6 makes spacing pin 3 can support and lean on keep off along 5 and make partial spacer pin 3 be located in spacing hole 21.
The buffer hole 8 is internally provided with a buffer spring 9 and a buffer positioning pin 10, the outer side wall of the buffer positioning pin 10 is provided with a buffer groove 17, the inner side wall of the buffer hole 8 is provided with a buffer lug 18, the buffer lug 18 is partially embedded into the buffer groove 17, one end of the buffer spring 9 is abutted against the connecting seat 2, the other end of the buffer spring 9 is abutted against the buffer positioning pin 10, and the buffer lug 18 can be abutted against the buffer positioning pin 10 under the elastic force of the buffer spring 9.
When the spacing post 12 is embedded into the spacing hole 21, the lateral wall of spacing post 12 is laminated mutually with the inside wall of spacing hole 21, and the spacing face that the locating pin 3 is located the part that the installation groove 16 has the slope setting, and the spacing face laminating is on the lateral wall of spacing groove 13, and locating pin 3 can be embedded into spacing groove 13 and make connecting seat 2 and 1 circumference location, as shown in fig. 4, installation department 14 part protrusion is outside connecting seat 2.
During machining, the connecting seat 2 is fixed on a cutter tower of the machine tool, a workpiece 19 to be machined is connected to the mounting column 11 in a threaded mode, the limiting column 12 of the mounting seat 1 is inserted into the limiting hole 21 of the connecting seat 2, the connecting seat 2 and the mounting seat 1 are circumferentially positioned, the cutter tower is moved, the workpiece 19 stretches into a soft claw of the machine tool, the workpiece 19 is clamped through the soft claw, then the cutter tower is moved reversely, the mounting seat 1 and the connecting seat 2 are separated, the mounting seat 1 is rotated, the workpiece 19 is separated from the mounting seat 1, finally, the workpiece 19 is subjected to thread length supplementing machining through a cutter, and after machining is finished, the workpiece 19 is disassembled, and machining of one workpiece 19 is finished.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Although terms such as the mount 1, the mount post 11, the limit post 12, the limit groove 13, the mount portion 14, the cut surface 15, the mount groove 16, the connection mount 2, the limit hole 21, the first connection portion 22, the second connection portion 23, the limit pin 3, the positioning hole 4, the flange 5, the limit spring 6, the limit plug 7, the buffer hole 8, the buffer spring 9, the buffer positioning pin 10, the buffer groove 17, the buffer bump 18, the work piece 19 are used more herein, the possibility of using other terms is not excluded. These terms are used merely for convenience in describing and explaining the nature of the invention; they are to be interpreted as any additional limitation that is not inconsistent with the spirit of the present invention.
Claims (6)
1. The utility model provides an internal thread helix initial angle positioner, includes mount pad (1) and connecting seat (2), its characterized in that, one end of mount pad (1) has protruding erection column (11) that sets up, have external screw thread on erection column (11), the other end of mount pad (1) has protruding spacing post (12) that sets up, have spacing hole (21) on connecting seat (2), spacing post (12) are embedded into spacing hole (21) and spacing post (12) can follow the axial slip of spacing hole (21) in spacing hole (21), connecting seat (2) and mount pad (1) circumference location, mount pad (1) still include installation department (14), erection column (11) are located the intermediate department of installation department (14) one side, spacing post (12) are located the intermediate department of installation department (14) opposite side, when spacing post (12) are embedded into spacing hole (21), installation department (14) part protrusion is outside connecting seat (2) and along the axial direction of spacing hole (21), connecting seat (2) and installation department (14) have, installation department (16) are located on installation department (14) and have, on the lateral wall (16) are located on connecting seat (2), buffer spring (9) and buffering locating pin (10) are arranged in buffer hole (8), have buffer groove (17) on the lateral wall of buffering locating pin (10), have buffer lug (18) on the inside wall of buffer hole (8), buffer lug (18) part is embedded into buffer groove (17), the one end of buffer spring (9) supports and leans on connecting seat (2), the other end of buffer spring (9) supports and leans on buffering locating pin (10) buffer lug (18) can support and lean on the cell wall of buffer groove (17) under the effect of buffer spring (9) elasticity.
2. An internal thread helix start angle positioning device according to claim 1, characterized in that when the limit post (12) is embedded in the limit hole (21), the outer side wall of the limit post (12) is attached to the inner side wall of the limit hole (21).
3. The internal thread spiral line start angle positioning device according to claim 1, wherein the outer side wall of the limiting column (12) is provided with a strip-shaped limiting groove (13), the limiting groove (13) penetrates through one end, far away from the mounting column (11), of the limiting column (12), the connecting seat (2) is provided with a limiting pin (3), and the limiting pin (3) can be embedded into the limiting groove (13) to enable the connecting seat (2) to be circumferentially positioned with the mounting seat (1).
4. A start angle positioning device for an internal thread spiral line according to claim 3, wherein two side walls of the limit groove (13) are obliquely arranged, a part of the limit pin (3) located in the mounting groove (16) is provided with an obliquely arranged limit surface, and when the limit post (12) is embedded into the limit hole (21), the limit surface is attached to the side wall of the limit groove (13).
5. The internal thread helix starting angle positioning device according to claim 1, 2, 3 or 4, wherein the connecting seat (2) is provided with a positioning hole (4) penetrating through the limiting hole (21), a blocking edge (5) is arranged at the joint of the positioning hole (4) and the limiting hole (21), the limiting pin (3) is penetrated in the positioning hole (4), the positioning hole (4) is further provided with a limiting spring (6) and a limiting plug (7), the limiting plug (7) is used for blocking one end of the positioning hole (4) away from the limiting hole (21), one end of the limiting spring (6) is abutted against the limiting pin (3), the other end of the limiting spring (6) is abutted against the limiting plug (7), and the limiting spring (6) enables the limiting pin (3) to be abutted against the blocking edge (5) and enables part of the limiting pin (3) to be located in the limiting hole (21).
6. The internal thread helix start angle positioning device according to claim 5, wherein the connection base (2) comprises a first connection portion (22) and a second connection portion (23), the limiting hole (21), the positioning hole (4) and the buffer hole (8) are all located in the first connection portion (22), the second connection portion (23) is located in the middle of one side of the first connection portion (22), the limiting hole (21) is located in the middle of the other side of the first connection portion (22), the positioning hole (4) is located above the limiting hole (21), the buffer hole (8) is located below the limiting hole (21), and the openings of the limiting hole (21) and the buffer hole (8) are the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711237694.0A CN107824910B (en) | 2017-11-30 | 2017-11-30 | Internal thread helix initial angle positioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711237694.0A CN107824910B (en) | 2017-11-30 | 2017-11-30 | Internal thread helix initial angle positioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107824910A CN107824910A (en) | 2018-03-23 |
| CN107824910B true CN107824910B (en) | 2024-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711237694.0A Active CN107824910B (en) | 2017-11-30 | 2017-11-30 | Internal thread helix initial angle positioner |
Country Status (1)
| Country | Link |
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| CN (1) | CN107824910B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111958066B (en) * | 2020-08-11 | 2022-12-02 | 天津大学 | Machining method of thread pair with controllable circumferential positioning angle |
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| CN205008697U (en) * | 2015-10-12 | 2016-02-03 | 李贵长 | Minor diameter deep hole internal thread secondary turning tool setting chi |
| CN106424981A (en) * | 2016-10-27 | 2017-02-22 | 上海新力动力设备研究所 | Novel method for accurately positioning thread of engine casing |
| CN207592963U (en) * | 2017-11-30 | 2018-07-10 | 台州职业技术学院 | A kind of internal thread helix initial angle positioning device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2520519B (en) * | 2013-11-22 | 2016-06-01 | Jaguar Land Rover Ltd | Rotationally oriented thread forming method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2141890C1 (en) * | 1998-01-30 | 1999-11-27 | Акционерное общество закрытого типа "Научно-производственное предприятие "Нефтетрубосервис" | Tool for restoring cone threads of oil production tubes |
| CN102350548A (en) * | 2011-09-30 | 2012-02-15 | 中国石化集团西南石油局管具公司 | Tool setting method for repairing thread by using numerically controlled lathe |
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| CN102744472A (en) * | 2012-04-20 | 2012-10-24 | 沈阳工业大学 | Device for mechanically positioning screw tracks on numerical control thread repairing lathe and positioning method |
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| CN205008697U (en) * | 2015-10-12 | 2016-02-03 | 李贵长 | Minor diameter deep hole internal thread secondary turning tool setting chi |
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| CN207592963U (en) * | 2017-11-30 | 2018-07-10 | 台州职业技术学院 | A kind of internal thread helix initial angle positioning device |
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| Publication number | Publication date |
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| CN107824910A (en) | 2018-03-23 |
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