CN111376066B - Tool for machining precise thin-wall bushing - Google Patents
Tool for machining precise thin-wall bushing Download PDFInfo
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- CN111376066B CN111376066B CN202010265980.3A CN202010265980A CN111376066B CN 111376066 B CN111376066 B CN 111376066B CN 202010265980 A CN202010265980 A CN 202010265980A CN 111376066 B CN111376066 B CN 111376066B
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- clamping
- pull rod
- hole
- sleeve
- bushing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P13/00—Making metal objects by operations essentially involving machining but not covered by a single other subclass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q2703/00—Work clamping
- B23Q2703/02—Work clamping means
- B23Q2703/10—Devices for clamping workpieces of a particular form or made from a particular material
Abstract
The invention relates to a tool for machining a precise thin-wall bushing. The clamping device comprises an elastic clamping sleeve used for clamping the thin-wall bushing; the outer sleeve is sleeved outside the elastic clamping sleeve and used for clamping and guiding the elastic clamping sleeve; the elastic clamping sleeve comprises an upper clamping part and a guide part arranged at the lower end of the clamping part, a clamping hole for placing the thin-wall bushing is arranged in the clamping part, the axis of the clamping hole is superposed with the axis of the thin-wall bushing, and the outer side surface of the clamping part is an outer conical surface with the size gradually reduced along the X direction; a first guide hole is formed in the guide part, and a pull rod for drawing the elastic clamping sleeve to move along the X direction penetrates through the first guide hole; the upper end of the outer sleeve is provided with the inner conical surface with the size gradually reduced along the X direction, the bushing can be prevented from changing, and the stable consistency of the size of the inner wall can be ensured by using the integrated composite forming cutter.
Description
Technical Field
The invention relates to the technical field of machining of mechanical connecting pieces, in particular to a tool for machining a precise thin-wall bushing.
Background
For satisfying the long-life connection requirement of aircraft, adopt usually to interfere connection technique and improve fatigue strength, in interfering the installation, to the big interference volume of the bolt realization of diameter more than 8mm, required power of impressing is great, the actual operation difficulty, can't satisfy the operation requirement, consequently need adopt the bush as interfering the connection carrier, use the fastening system who takes interior awl bush, can significantly reduce and interfere installation stroke and installation power of impressing, can also avoid interfering the connection layering to the combined material structure, can play electrically conductive protection effect simultaneously. The high-precision processing of the thin-wall bushing used for interference connection is very important, and the improper technological method often generates waste products such as instability, deformation and the like.
The thin-wall bushing processed by the prior art is formed by grinding and riveting a pipe, after flaring, metal is accumulated below the head of the bushing, the fillet at the joint of the head and the rod part of the bushing is unstable, the practical use requirement cannot be met, the pipe is easy to deform, the size is out of tolerance, the head is easy to crack, and the product is scrapped.
Disclosure of Invention
The embodiment of the invention provides a tool for machining a precise thin-wall bushing, which can avoid the bushing from changing and can ensure the stable consistency of the size of an inner wall by using an integrated composite forming cutter.
In a first aspect, an embodiment of the present invention provides a tool for machining a precision thin-walled bushing, including an elastic ferrule for clamping the thin-walled bushing; the outer sleeve is sleeved outside the elastic clamping sleeve and used for clamping and guiding the elastic clamping sleeve; the elastic clamping sleeve comprises an upper clamping part and a guide part arranged at the lower end of the clamping part, a clamping hole for placing the thin-wall bushing is arranged in the clamping part, the axis of the clamping hole is superposed with the axis of the thin-wall bushing, and the outer side surface of the clamping part is an outer conical surface with the size gradually reduced along the X direction; a first guide hole is formed in the guide part, and a pull rod for drawing the elastic clamping sleeve to move along the X direction penetrates through the first guide hole; the outer sleeve is characterized in that an inner conical surface gradually reduced in size along the X direction is arranged at the upper end of the outer sleeve, when the pull rod pulls the elastic clamping sleeve along the X direction, the outer conical surface is attached to the inner conical surface and moves relatively, the elastic clamping sleeve contracts inwards to clamp the bushing, a second guide hole used for guiding the elastic clamping sleeve is arranged at the lower end of the outer sleeve along the X direction, and when the pull rod pulls the elastic clamping sleeve along the X direction, the inner wall surface of the second guide hole is attached to the outer end surface of the guide part.
Further, the inner shape and the size of the clamping hole are matched with the outer contour and the outer size of the thin-wall bushing.
Further, clamping portion includes a plurality of grip blocks that the even interval of circumference set up, and the grip block inner side wall becomes the clamping hole, is equipped with spacing hole along the X direction between the adjacent grip block, and spacing downthehole spacer pin that is used for injecing clamping portion internal contraction volume that is equipped with, when the pull rod pulls the elastic card cover along the X direction, the grip block draws close each other and presss from both sides tight spacer pin, and when the spacer pin is pressed from both sides tightly the back, clamping portion can't contract to the inboard.
Further, the pull rod comprises a pull rod shaft and a pull rod end cover, a pull rod step is formed between the pull rod end cover and the pull rod shaft, and when the pull rod axially draws the elastic clamping sleeve outwards along the first guide hole, the lower end face of the pull rod step is attached to the upper end face of the first step.
In a second aspect, the present invention provides a method for machining a precision thin-walled bushing, comprising the steps of:
step 1: placing a bush blank with a solid structure in the mounting hole;
step 2: the pull rod drives the elastic clamping sleeve to move towards the X direction through the guide part, and the elastic clamping sleeve contracts inwards to clamp the bush blank so as to realize clamping;
and step 3: and removing machining allowance by using a forming cutter to form the inner cavity profile of the bushing.
Further, the forming tool in the step 3 is an integrated composite forming tool, and the forming tool comprises countersunk angle cutting edges which are sequentially arranged from top to bottom and used for processing countersunk holes in the lining; the arc blade is used for processing the inner fillet of the bushing; and the inner hole cutting edge is used for processing the inner hole of the bushing.
Furthermore, the inner hole cutting edge is a taper cutting edge and is used for processing the taper of the inner hole.
Further, the taper of the inner hole is 0 degree or 1-2 degrees.
In conclusion, the elastic clamping sleeve is matched with the outer sleeve to clamp the thin-wall bushing, and the elastic clamping sleeve can ensure accurate clamping of the elastic clamping sleeve on the bushing and guarantee no deformation of clamping by arranging a plurality of clamping blocks and pin limiting, so that the dimensional accuracy of the outer diameter of the bushing is guaranteed; the stable consistency of the inner wall size can be ensured by using the integrated composite forming cutter, and the size precision requirement of an interference connection fastening system can be met; the inner hole can be processed into a bushing with a straight wall and an inner taper by selecting inner hole blades with different tapers.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural view of a thin-walled bushing blank;
FIG. 2 is a cross-sectional view of a formed thin-walled bushing;
FIG. 3 is a schematic view of the tooling structure of the present invention;
fig. 4 is a half sectional view of the resilient ferrule of the present invention;
fig. 5 is a schematic structural view of the elastic card sleeve in the invention;
FIG. 6 is a schematic view of the spacing pin of the present invention;
FIG. 7 is a half sectional view of the outer cover of the present invention;
FIG. 8 is a schematic view of the structure of the tie bar of the present invention;
FIG. 9 is a schematic structural view of the integrally formed cutter of the present invention.
In the figure: 1. an elastic card sleeve; 11. mounting a hole countersink; 12. the mounting hole is internally provided with a round corner; 13. a mounting hole tubular portion; 14. a guide portion; 15. a first step; 16. a first guide hole; 17. a limiting hole; 18. a clamping block; 19. an outer conical surface; 2. a spacing pin; 3. a jacket; 31. an inner conical surface; 32. a second guide hole; 4. a pull rod; 41. a pull rod step; 42. a pull rod shaft; 5. a bushing; 6. integrally and compositely molding the cutter; 61. a countersunk angle blade; 62. a circular arc blade; 63. and (4) cutting edges of the inner hole.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention and are not intended to limit the scope of the invention, i.e., the invention is not limited to the embodiments described, but covers any modifications, alterations, and improvements in the parts, components, and connections without departing from the spirit of the invention.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 3, which is a first aspect of the embodiment of the present invention, the inner cavity surface of the thin-walled bushing in the present invention includes an inner countersunk surface B, an inner bore of the bushing, wherein the taper of the inner bore of the bushing is a, the inner diameter of the bushing is D, the inner fillet of the bushing is R, the outer diameter of the bushing is D, the outer fillet of the bushing is R, and the wall thickness of the bushing is T. The embodiment of the invention provides a tool for machining a precise thin-wall bushing. The clamping device comprises an elastic clamping sleeve 1 for clamping a thin-wall bushing 5; the outer sleeve 3 is sleeved outside the elastic clamping sleeve 1 and used for clamping and guiding the elastic clamping sleeve 1; the elastic clamping sleeve 1 comprises an upper clamping part and a guide part 14 arranged at the lower end of the clamping part, the clamping part and the guide part 14 are integrally formed, a clamping hole for placing the thin-wall bushing 5 is formed in the clamping part, the axis of the clamping hole is superposed with the axis of the thin-wall bushing 5, and the outer side surface of the clamping part is an outer conical surface 19 with the size gradually reduced along the X direction; a first guide hole 16 is formed in the guide part 14, and a pull rod 4 for drawing the elastic cutting sleeve 1 to move along the X direction penetrates through the first guide hole 16; the outer 3 upper ends of overcoat are equipped with along the interior conical surface 31 that X direction size reduces gradually, and when the pull rod 4 when drawing elastic ferrule 1 along the X direction, outer conical surface 19 laminates and relative motion with interior conical surface 31 mutually, and elastic ferrule 1 contracts to the inboard and presss from both sides bush 5 chucking, and 3 lower extremes of overcoat are equipped with the second guiding hole 32 that is used for elastic ferrule 1 to lead along the X direction, and when pull rod 4 when drawing elastic ferrule 1 along the X direction, the interior face of second guiding hole 32 is laminated with the outer terminal surface of guide part 14 mutually.
In order to make the inner wall of the clamping hole and the outer wall of the bushing 5 be attached more tightly, the inner shape and size of the clamping hole are matched with the outer contour and outer size of the thin-walled bushing 5, the clamping hole comprises a mounting hole countersunk portion 11 and a mounting hole tubular portion 13 which are sequentially arranged along the X direction, a mounting hole fillet 12 is arranged between the mounting hole countersunk portion 11 and the mounting hole tubular portion 13, as shown in fig. 2, when the bushing 5 is placed in the mounting hole, the outer end surface of the head of the bushing 5 is in contact with the inner wall of the mounting hole countersunk portion 11, namely, the outer end surface of the inner countersunk portion B of the bushing 5 in fig. 2 is in contact with the inner wall surface of the mounting hole countersunk portion 11, the outer wall surface of the inner hole of the bushing 5 is in contact with the inner wall surface of the clamping hole, the outer fillet of the bushing 5 is in contact with the fillet 12 in the mounting hole, namely, the outer fillet R of the bushing 5 in fig. 2 is in contact with the fillet 12 in the mounting hole.
In order to limit the shrinkage of clamping portion, control the clamping dynamics, clamping portion includes a plurality of grip blocks 18 that set up along the even interval of circumference, grip block 18 inboard encloses into the clamping hole, as shown in fig. 5, the clamping hole has been enclosed into to the inboard of a plurality of grip blocks 18, be equipped with spacing hole 17 along the X direction between the adjacent grip block 18, be equipped with the spacer pin 2 that is used for injecing the inside shrinkage of clamping portion in spacing hole 17, when pull rod 4 draws elastic ferrule 1 along the X direction, grip block 18 draws close each other and presss from both sides tight spacer pin 2, when spacer pin 2 is pressed from both sides tightly the back, clamping portion can't contract to the inboard.
As shown in fig. 8, the pull rod 4 includes a pull rod shaft 42 and a pull rod 4 end cap, the pull rod shaft 42 and the pull rod 4 end cap are integrally formed, a pull rod step 41 is formed between the pull rod 4 end cap and the pull rod shaft 42, and when the pull rod 4 axially draws the elastic ferrule 1 outwards along the first guide hole 16, a lower end surface of the pull rod step 41 is attached to an upper end surface of the first step 15.
In a second aspect, as shown in fig. 1 to 3, the present invention provides a method for machining a precision thin-walled bushing 5, comprising the steps of:
step 1: placing a blank of the bushing 5 with a solid structure in the mounting hole;
step 2: the pull rod 4 drives the elastic clamping sleeve 1 to move towards the X direction through the guide part 14, and the elastic clamping sleeve 1 contracts inwards to clamp the blank of the bushing 5 to realize clamping;
and step 3: and removing machining allowance by using a forming cutter to form the inner cavity profile of the lining 5.
In order to ensure the stable consistency of the inner wall dimension, as shown in fig. 9, the forming tool in step 3 is an integrated composite forming tool 6, and the forming tool comprises countersunk angle blades 61 which are sequentially arranged from top to bottom and are used for processing countersunk holes in the bushing 5; a circular arc blade 62 for machining the fillet of the bush 5; and an inner hole cutting edge 63 for processing the inner hole of the bushing 5.
In order to machine the bore of the tapered bush 5, the bore cutting edge 63 is a tapered cutting edge for machining the bore taper. The taper of the inner hole is 0 degree or 1-2 degrees
Specific example 1: machining a bushing 5 with the inner diameter d of 8mm, wherein the taper A of an inner hole of the bushing 5 is 1.2 degrees +/-0.05 degrees, the wall thickness T of the bushing 5 is 0.20mm, and the taper length is 11 mm.
In the clamping process, the outer end face of the head of the bushing 5 is in contact with the inner wall of the mounting hole countersunk head portion 11, namely, the outer end face of the inner countersunk head face B of the bushing 5 in fig. 2 is in contact with the inner wall of the mounting hole countersunk head portion 11, the outer wall face of the inner hole of the bushing 5 is in contact with the inner wall of the inner hole of the clamping hole, and the outer fillet of the bushing 5 is in contact with the inner fillet 12 of the mounting hole, namely, the outer fillet R at the joint of the head and the tail of the bushing 5 in fig. 2 is in contact with the inner fillet 12 of the mounting hole. When a blank of the bushing 5 needs to be clamped, the pull rod 4 moves in the X direction, the pull rod step 41 drives the first step 15 to move in the X direction, the pull rod shaft 42 moves axially along the first guide hole 16, the outer conical surface of the elastic clamping sleeve 1 and the inner conical surface of the outer sleeve 3 move relatively, and under the condition that the conical surfaces move relatively, the elastic clamping sleeve 1 contracts inwards, so that the bushing 5 is held tightly to achieve clamping.
The guide part 14 of the elastic card sleeve 1 and the second guide hole 32 at the tail part of the outer sleeve 3 do relative movement in the X direction, and the second guide hole 32 at the tail part of the outer sleeve 3 plays a role in guiding. Three spacing holes 17 of clamping portion along circumference distribution cooperate with the excircle of spacer pin 2, when elastic ferrule 1 inwards tightens up, because spacer pin 2's limiting displacement, can obtain the accurate chucking diameter of mounting hole tubulose portion 13, realize the accurate clamping of elastic ferrule 1 and bush 5, can guarantee the clamping indeformable to guarantee the size precision of bush 5 external diameter.
After clamping is finished, the integral composite forming cutter 6 with the taper of the inner hole cutting edge 63 of 1.2 +/-0.05 degrees is selected to process the inner cavity surface of the bush 5 blank.
Specific example 2: and (3) processing the bush 5 with the inner diameter d of 7.6mm, wherein the taper A of the inner hole of the bush 5 is 0 degree, namely the straight-wall bush 5, the wall thickness T of the bush 5 is 0.20mm, and the length is 11 mm.
In the clamping process, the outer end face of the head of the bushing 5 is in contact with the inner wall of the mounting hole countersunk head portion 11, namely, the outer end face of the inner countersunk head face B of the bushing 5 in fig. 2 is in contact with the inner wall of the mounting hole countersunk head portion 11, the outer wall face of the inner hole of the bushing 5 is in contact with the inner wall of the inner hole of the clamping hole, and the outer fillet of the bushing 5 is in contact with the inner fillet 12 of the mounting hole, namely, the outer fillet R at the joint of the head and the tail of the bushing 5 in fig. 2 is in contact with the inner fillet 12 of the mounting hole. When a blank of the bushing 5 needs to be clamped, the pull rod 4 moves in the X direction, the pull rod step 41 drives the first step 15 to move in the X direction, the pull rod shaft 42 moves axially along the first guide hole 16, the outer conical surface of the elastic clamping sleeve 1 and the inner conical surface of the outer sleeve 3 move relatively, and under the condition that the conical surfaces move relatively, the elastic clamping sleeve 1 contracts inwards, so that the bushing 5 is held tightly to achieve clamping.
The guide part 14 of the elastic card sleeve 1 and the second guide hole 32 at the tail part of the outer sleeve 3 do relative movement in the X direction, and the second guide hole 32 at the tail part of the outer sleeve 3 plays a role in guiding. Three spacing holes 17 of clamping portion along circumference distribution cooperate with the excircle of spacer pin 2, when elastic ferrule 1 inwards tightens up, because spacer pin 2's limiting displacement, can obtain the accurate chucking diameter of mounting hole tubulose portion 13, realize the accurate clamping of elastic ferrule 1 and bush 5, can guarantee the clamping indeformable to guarantee the size precision of bush 5 external diameter.
After clamping is finished, the inner cavity surface of the bush 5 blank is machined by the integral composite forming tool 6 with the taper of the inner hole cutting edge 63 of 0 degree.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. For embodiments of the method, reference is made to the description of the apparatus embodiments in part. The present invention is not limited to the specific steps and structures described above and shown in the drawings. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
The above description is only an example of the present application and is not limited to the present application. Various modifications and alterations to this application will become apparent to those skilled in the art without departing from the scope of this invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (3)
1. A tool for machining a precise thin-wall bushing is characterized by comprising an elastic clamping sleeve for clamping the thin-wall bushing; the outer sleeve is sleeved outside the elastic clamping sleeve and used for clamping and guiding the elastic clamping sleeve; the elastic clamping sleeve comprises an upper clamping part and a guide part arranged at the lower end of the clamping part, a clamping hole for placing the thin-wall bushing is arranged in the clamping part, the axis of the clamping hole is superposed with the axis of the thin-wall bushing, and the outer side surface of the clamping part is an outer conical surface with the size gradually reduced along the X direction; a first guide hole is formed in the guide part, and a pull rod for drawing the elastic clamping sleeve to move along the X direction penetrates through the first guide hole; the upper end of the outer sleeve is provided with an inner conical surface with the size gradually reduced along the X direction, when the pull rod pulls the elastic clamping sleeve along the X direction, the outer conical surface is attached to the inner conical surface and moves relatively, the elastic clamping sleeve contracts inwards to clamp the bushing, the lower end of the outer sleeve is provided with a second guide hole for guiding the elastic clamping sleeve along the X direction, and when the pull rod pulls the elastic clamping sleeve along the X direction, the inner wall surface of the second guide hole is attached to the outer end surface of the guide part; clamping portion includes a plurality of grip blocks that set up along the even interval of circumference, and the grip block inner side wall becomes the clamping hole, is equipped with spacing hole along the X direction between the adjacent grip block, and spacing downthehole spacer pin that is used for injecing clamping portion internal contraction volume that is equipped with, when the pull rod draws the elastic card cover along the X direction, the grip block is drawn close each other and is pressed from both sides tight spacer pin, and when the spacer pin is pressed from both sides tightly the back, clamping portion can't contract to the inboard.
2. The tooling for machining the precise thin-wall bushing according to claim 1, wherein the inner shape and the size of the clamping hole are matched with the outer contour and the outer size of the thin-wall bushing.
3. The tool for machining the precise thin-wall bushing according to claim 1, wherein the pull rod comprises a pull rod shaft and a pull rod end cover, a pull rod step is formed between the pull rod end cover and the pull rod shaft, and when the elastic clamping sleeve is pulled outwards by the pull rod along the axial direction of the first guide hole, the lower end face of the pull rod step is attached to the upper end face of the first step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010265980.3A CN111376066B (en) | 2020-04-07 | 2020-04-07 | Tool for machining precise thin-wall bushing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010265980.3A CN111376066B (en) | 2020-04-07 | 2020-04-07 | Tool for machining precise thin-wall bushing |
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| Publication Number | Publication Date |
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| CN111376066A CN111376066A (en) | 2020-07-07 |
| CN111376066B true CN111376066B (en) | 2021-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010265980.3A Active CN111376066B (en) | 2020-04-07 | 2020-04-07 | Tool for machining precise thin-wall bushing |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3659863A (en) * | 1969-10-07 | 1972-05-02 | Buttner Horace Judson | Automatic drill chuck and split collet |
| CN202622007U (en) * | 2012-03-27 | 2012-12-26 | 牧野机床（中国）有限公司 | Cutter for machining counter bore |
| CN103769638A (en) * | 2012-10-24 | 2014-05-07 | 西安志越机电科技有限公司 | Inward contracting type spring sleeve clamp |
| CN107234464A (en) * | 2017-07-31 | 2017-10-10 | 江南工业集团有限公司 | Shape locating and machining clamping device in a kind of thin_wall cylinder part is complicated |
| CN209303753U (en) * | 2018-12-19 | 2019-08-27 | 郑士林 | A kind of collet |
-
2020
- 2020-04-07 CN CN202010265980.3A patent/CN111376066B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3659863A (en) * | 1969-10-07 | 1972-05-02 | Buttner Horace Judson | Automatic drill chuck and split collet |
| CN202622007U (en) * | 2012-03-27 | 2012-12-26 | 牧野机床（中国）有限公司 | Cutter for machining counter bore |
| CN103769638A (en) * | 2012-10-24 | 2014-05-07 | 西安志越机电科技有限公司 | Inward contracting type spring sleeve clamp |
| CN107234464A (en) * | 2017-07-31 | 2017-10-10 | 江南工业集团有限公司 | Shape locating and machining clamping device in a kind of thin_wall cylinder part is complicated |
| CN209303753U (en) * | 2018-12-19 | 2019-08-27 | 郑士林 | A kind of collet |
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| CN111376066A (en) | 2020-07-07 |
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