CN115070475A - Precision liquid expansion clamp - Google Patents
Precision liquid expansion clamp Download PDFInfo
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- CN115070475A CN115070475A CN202210926515.9A CN202210926515A CN115070475A CN 115070475 A CN115070475 A CN 115070475A CN 202210926515 A CN202210926515 A CN 202210926515A CN 115070475 A CN115070475 A CN 115070475A
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- Prior art keywords
- hydraulic
- annular
- base
- workpiece
- liquid expansion
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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
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/08—Work-clamping means other than mechanically-actuated
- B23Q3/082—Work-clamping means other than mechanically-actuated hydraulically actuated
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jigs For Machine Tools (AREA)
Abstract
The invention discloses a precise liquid expansion clamp which comprises a base, wherein a workpiece mounting part matched with a workpiece is arranged on the base; the workpiece mounting part is provided with an annular elastic part matched with the profile of the inner/outer side wall of the workpiece, and the annular elastic part is of an integral structure; one side of the workpiece mounting part is provided with an annular hydraulic cavity, and one side of the annular elastic part is positioned in the annular hydraulic cavity and is in sliding fit with the annular hydraulic cavity; the base is also provided with a hydraulic driving device communicated with the annular hydraulic cavity. The precision liquid expansion clamp provided by the invention has the advantages that the circumferential clamping force is uniformly distributed, the workpiece is stably clamped and is not easy to deform, and the precision liquid expansion clamp is suitable for high-precision machining.
Description
Technical Field
The invention relates to the field of clamps, in particular to a precise liquid expansion clamp.
Background
When a workpiece is machined or drilled, it is necessary to fix the workpiece by a jig. Different clamps are adopted according to the shape of the workpiece. The clamp which is generally adopted at present clamps a workpiece by using three clamping jaws. Although the structure is stable in clamping, when the clamping jaw is in contact with the inner/outer peripheral wall of the workpiece, only part of the workpiece is stressed, the rest positions are not stressed, when the rigidity of the workpiece is poor, the workpiece is easy to deform, and the dimensional accuracy of the machined part is low, so that the dial calibration is needed during clamping. The collet chuck adopts 4-8 clamping parts, and compared with the structure of three clamping jaws, the collet chuck has better clamping precision and repeatability precision, but can not meet the corresponding precision requirement in high-precision machining and thin-wall cylindrical workpiece machining.
Disclosure of Invention
The invention aims to provide a precise liquid expansion clamp which is uniform in circumferential clamping force distribution, stable in workpiece clamping, not easy to deform and suitable for high-precision machining.
In order to achieve the purpose, the invention provides a precise liquid expansion clamp which comprises a base, wherein a workpiece mounting part matched with a workpiece is arranged on the base; the workpiece mounting part is provided with an annular elastic part matched with the contour of the inner/outer side wall of the workpiece, and the annular elastic part is of an integral structure; one side of the workpiece mounting part is provided with an annular hydraulic cavity, and one side of the annular elastic part is positioned in the annular hydraulic cavity and is in sliding fit with the annular hydraulic cavity; the base is also provided with a hydraulic driving device communicated with the annular hydraulic cavity.
As a further improvement of the invention, the workpiece mounting part is a plug hole; the annular elastic piece is arranged on the annular opening on the inner side wall of the inserting hole; the annular hydraulic pressure chamber sets up in the inside wall of spliced eye and communicates with the annular opening of spliced eye inside wall.
As a further improvement of the present invention, the workpiece mounting portion is a sleeve shaft; the annular elastic piece is arranged on an annular opening on the outer side wall of the sleeve shaft; the annular hydraulic pressure chamber sets up in the lateral wall of cup jointing the axle and communicates with the annular opening that cup joints the off-axial lateral wall.
As a still further improvement of the present invention, the hydraulic drive device includes a first hydraulic drive device; the first hydraulic driving device comprises a first hydraulic channel arranged on the base, and further comprises a piston rod, a first piston and a first sealing element which are sequentially connected; the other end of the piston rod penetrates out of the base, and the piston rod is in sliding fit with the base; the first piston and the first sealing element are both positioned in the first hydraulic channel and are in sliding fit with the first hydraulic channel; the first hydraulic passage communicates with the annular hydraulic chamber.
As a further improvement of the present invention, the hydraulic drive device further includes a second hydraulic drive device; the first hydraulic driving device comprises a second hydraulic channel arranged on the base, and further comprises a handle, an external thread piece, a second piston and a second sealing piece which are sequentially matched along a straight line; the external thread piece is in threaded fit with the base, and the second piston and the second sealing piece are both positioned in the second hydraulic channel and are in sliding fit with the second hydraulic channel; the second hydraulic passage communicates with the annular hydraulic chamber.
As a further improvement of the invention, a third hydraulic channel is arranged on the base; the output ends of the first hydraulic channel and the second hydraulic channel are communicated with the input end of a third hydraulic channel, and the output end of the third hydraulic channel is communicated with the annular hydraulic cavity.
As a further development of the invention, the annular elastic member is a steel member.
Advantageous effects
Compared with the prior art, the precision liquid expansion clamp has the advantages that:
1. when the workpiece mounting part is a plug hole, the shaft-shaped workpiece can be inserted into the plug hole and clamped and fixed inwards by the annular elastic piece. When the workpiece mounting part is a sleeve shaft, the annular workpiece can be sleeved on the sleeve shaft and is outwards expanded and fixed by the annular elastic part. Because the annular elastic part is integrally formed and is of a closed annular structure, the annular elastic part generates elastic deformation by utilizing hydraulic pressure to clamp the workpiece, the circumferential clamping force of the workpiece is uniformly distributed, the workpiece is not easy to deform, the workpiece is suitable for high-precision machining, and the thin-wall cylindrical workpiece is not easy to deform even if the thin-wall cylindrical workpiece is machined.
2. The piston rod of the first hydraulic driving device is driven by external force (such as an air cylinder and the like) to slide along the axial direction, and the annular elastic part can be deformed and clamp a workpiece by utilizing hydraulic pressure. And the second hydraulic driving device adjusts the position of the second piston by rotating the handle by personnel, so that the annular elastic part is deformed by hydraulic pressure. Through setting up first hydraulic drive device and second hydraulic drive device, even first hydraulic drive device can not use because of the external equipment reason, also can realize the centre gripping of work piece through the manual operation, ensure production continuity.
The invention will become more apparent from the following description when taken in conjunction with the accompanying drawings, which illustrate embodiments of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a sectional view of a precision liquid expansion jig in example 1;
FIG. 2 is a sectional view showing a state in which a precision liquid-swelling jig according to example 1 is used;
FIG. 3 is a view taken along line A-A of FIG. 2;
fig. 4 is a partial sectional view of a precision liquid expansion jig in embodiment 2;
fig. 5 is a view from the direction B-B of fig. 4.
Detailed Description
Embodiments of the present invention will now be described with reference to the accompanying drawings.
Example 1
Referring to fig. 1 to 3, a precision liquid expansion fixture according to an embodiment of the present invention includes a base 1, and a workpiece mounting portion adapted to a workpiece 9 is disposed on the base 1. The workpiece mounting part is provided with an annular elastic part 3 matched with the outline of the outer side wall of the workpiece 9, and the annular elastic part 3 is of an integral structure. One side of the workpiece mounting part is provided with an annular hydraulic cavity 2, and one side of the annular elastic part 3 is positioned in the annular hydraulic cavity 2 and is in sliding fit with the annular hydraulic cavity 2. The base 1 is also provided with a hydraulic driving device communicated with the annular hydraulic cavity 2.
In this embodiment, the workpiece mounting portion is a socket 11. The annular elastic element 3 is arranged on an annular opening on the inner side wall of the inserting hole 11. Annular hydraulic pressure chamber 2 sets up in the inside wall of spliced eye 11 and communicates with the annular opening of spliced eye 11 inside wall.
The hydraulic drive comprises a first hydraulic drive 5. The first hydraulic drive device 5 comprises a first hydraulic channel 54 arranged on the base 1, the first hydraulic drive device 5 further comprising a piston rod 52, a first piston 51 and a first seal 53 connected in sequence. The other end of the piston rod 52 penetrates out of the base 1, and the piston rod 52 is in sliding fit with the base 1. First piston 51 and first seal 53 are both located within first hydraulic passage 54 and are in sliding engagement with first hydraulic passage 54. The first hydraulic passage 54 communicates with the annular hydraulic chamber 2.
The hydraulic drive also comprises a second hydraulic drive 8. The first hydraulic drive device 5 includes a second hydraulic passage 85 provided on the base 1, and the first hydraulic drive device 5 further includes a handle 84, an external screw member 83, a second piston 82, and a second seal member 81 which are fitted in order along a straight line. The external screw 83 is screw-fitted to the base 1, and the second piston 82 and the second seal 81 are both located in the second hydraulic passage 85 and are slidably fitted to the second hydraulic passage 85. The second hydraulic passage 85 communicates with the annular hydraulic chamber 2. In this embodiment, the handle 84 is fixedly connected to the external screw member 83, and the external screw member 83 is rotatably connected to the second piston 82 about the common axis therebetween.
The first seal 53 and the second seal 81 prevent hydraulic oil in the hydraulic passage from leaking out of the base 1.
The base 1 is provided with a third hydraulic passage 4. The output ends of both the first hydraulic passage 54 and the second hydraulic passage 85 are communicated with the input end of the third hydraulic passage 4, and the output end of the third hydraulic passage 4 is communicated with the annular hydraulic chamber 2.
In this embodiment, the annular elastic member 3 is a steel member. The elastic deformation range of the annular elastic part 3 does not need to be too large, and only the workpiece 9 can be inserted into the inserting hole 11 when the oil pressure in the hydraulic channel is low, and the annular elastic part 3 clamps the workpiece 9 under the action of high hydraulic pressure.
Example 2
As shown in fig. 4 and 5, the difference from embodiment 1 is that an annular elastic member 3 adapted to the contour of the inner side wall of the workpiece 9 is provided on the workpiece mounting portion. The workpiece mounting portion is a sleeve shaft 12. The annular elastic member 3 is provided on an annular opening located on the outer side wall of the sleeve shaft 12. The annular hydraulic cavity 2 is arranged in the outer side wall of the sleeved shaft 12 and is communicated with an annular opening in the outer side wall of the sleeved shaft 12.
The output ends of both the first hydraulic passage 54 and the second hydraulic passage 85 are communicated with the input end of the third hydraulic passage 4, and the output end of the third hydraulic passage 4 is communicated with the annular hydraulic chamber 2.
The cylindrical or annular workpiece 9 is sleeved outside the sleeve shaft 12, and the annular elastic part 3 is externally supported and contacted with the inner wall of the workpiece 9 by utilizing the hydraulic lifting in the annular hydraulic cavity 2, so that the workpiece 9 can be fixed.
The present invention has been described in connection with the preferred embodiments, but the present invention is not limited to the embodiments disclosed above, and is intended to cover various modifications, equivalent combinations, which are made in accordance with the spirit of the present invention.
Claims (7)
1. The precision liquid expansion clamp is characterized by comprising a base (1), wherein a workpiece mounting part matched with a workpiece (9) is arranged on the base (1); the workpiece mounting part is provided with an annular elastic part (3) matched with the contour of the inner/outer side wall of the workpiece (9), and the annular elastic part (3) is of an integral structure; one side of the workpiece mounting part is provided with an annular hydraulic cavity (2), and one side of the annular elastic part (3) is positioned in the annular hydraulic cavity (2) and is in sliding fit with the annular hydraulic cavity (2); the base (1) is also provided with a hydraulic driving device communicated with the annular hydraulic cavity (2).
2. A precision liquid expansion jig according to claim 1 wherein the workpiece mounting portion is a spigot hole (11); the annular elastic piece (3) is arranged on an annular opening on the inner side wall of the inserting hole (11); annular hydraulic pressure chamber (2) set up in the inside wall of spliced eye (11) and with the annular opening intercommunication of spliced eye (11) inside wall.
3. A precision liquid expansion clamp according to claim 1, characterized in that the workpiece mounting part is a sleeve spindle (12); the annular elastic piece (3) is arranged on an annular opening on the outer side wall of the sleeve shaft (12); the annular hydraulic cavity (2) is arranged in the outer side wall of the sleeve shaft (12) and communicated with an annular opening in the outer side wall of the sleeve shaft (12).
4. A precision liquid expansion clamp according to claim 1 or 2 or 3, characterized in that said hydraulic drive means comprises a first hydraulic drive means (5); the first hydraulic driving device (5) comprises a first hydraulic channel (54) arranged on the base (1), and the first hydraulic driving device (5) further comprises a piston rod (52), a first piston (51) and a first sealing element (53) which are sequentially connected; the other end of the piston rod (52) penetrates out of the base (1), and the piston rod (52) is in sliding fit with the base (1); the first piston (51) and the first sealing element (53) are both positioned in the first hydraulic channel (54) and are in sliding fit with the first hydraulic channel (54); the first hydraulic passage (54) communicates with the annular hydraulic chamber (2).
5. A precision liquid expansion clamp according to claim 4, characterized in that said hydraulic driving means further comprises second hydraulic driving means (8); the first hydraulic driving device (5) comprises a second hydraulic channel (85) arranged on the base (1), and the first hydraulic driving device (5) further comprises a handle (84), an external thread piece (83), a second piston (82) and a second sealing piece (81) which are sequentially matched along a straight line; the external thread element (83) is in threaded fit with the base (1), and the second piston (82) and the second sealing element (81) are both positioned in the second hydraulic passage (85) and are in sliding fit with the second hydraulic passage (85); the second hydraulic passage (85) communicates with the annular hydraulic chamber (2).
6. A precision liquid expansion clamp according to claim 5, characterized in that the base (1) is provided with a third hydraulic channel (4); the output ends of the first hydraulic channel (54) and the second hydraulic channel (85) are communicated with the input end of a third hydraulic channel (4), and the output end of the third hydraulic channel (4) is communicated with the annular hydraulic cavity (2).
7. A precision liquid expansion clamp according to claim 1, characterized in that the annular elastic member (3) is a steel member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210926515.9A CN115070475A (en) | 2022-08-03 | 2022-08-03 | Precision liquid expansion clamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210926515.9A CN115070475A (en) | 2022-08-03 | 2022-08-03 | Precision liquid expansion clamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115070475A true CN115070475A (en) | 2022-09-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210926515.9A Pending CN115070475A (en) | 2022-08-03 | 2022-08-03 | Precision liquid expansion clamp |
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| Country | Link |
|---|---|
| CN (1) | CN115070475A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116728135A (en) * | 2023-07-13 | 2023-09-12 | 森泰英格（成都）数控刀具股份有限公司 | Combined finish machining fixture system for inner hole of aircraft fuel nozzle and finish machining method thereof |
| CN117102907A (en) * | 2023-10-24 | 2023-11-24 | 广州德马威工业装备制造有限公司 | High-precision flexible composite liquid expansion tool clamp for thin-wall workpiece |
-
2022
- 2022-08-03 CN CN202210926515.9A patent/CN115070475A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116728135A (en) * | 2023-07-13 | 2023-09-12 | 森泰英格（成都）数控刀具股份有限公司 | Combined finish machining fixture system for inner hole of aircraft fuel nozzle and finish machining method thereof |
| CN116728135B (en) * | 2023-07-13 | 2024-03-12 | 森泰英格（成都）数控刀具股份有限公司 | Combined finish machining fixture system for inner hole of aircraft fuel nozzle and finish machining method thereof |
| CN117102907A (en) * | 2023-10-24 | 2023-11-24 | 广州德马威工业装备制造有限公司 | High-precision flexible composite liquid expansion tool clamp for thin-wall workpiece |
| CN117102907B (en) * | 2023-10-24 | 2024-01-16 | 广州德马威工业装备制造有限公司 | High-precision flexible composite liquid expansion tool clamp for thin-wall workpiece |
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