CN110102792B - Core expanding clamp suitable for workpiece with gully on inner wall and using method of core expanding clamp - Google Patents
Core expanding clamp suitable for workpiece with gully on inner wall and using method of core expanding clamp Download PDFInfo
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- CN110102792B CN110102792B CN201910410682.6A CN201910410682A CN110102792B CN 110102792 B CN110102792 B CN 110102792B CN 201910410682 A CN201910410682 A CN 201910410682A CN 110102792 B CN110102792 B CN 110102792B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/40—Expansion mandrels
- B23B31/404—Gripping the work or tool by jaws moving radially controlled by conical surfaces
- B23B31/4046—Details of the jaws
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Abstract
A core expansion clamp suitable for a workpiece with gully on the inner wall comprises a concentric shaft, a limiting taper end socket sleeved on one side of the concentric shaft, and a movable taper end socket sleeved on the other side of the concentric shaft; a concentric shaft between the limiting taper end and the movable taper end is sleeved with a taper expansion core; a plurality of cutting seams are uniformly processed on two sides of the taper expansion core along the length direction, and the taper expansion core is divided into a first expansion core flap group close to a limiting taper end and a second expansion core flap group close to a movable taper end by the cutting seams; a plurality of blind holes are formed in the upper surfaces of the first core expansion flap group and the second core expansion flap group, and a permanent magnet sheet and a movable block are arranged in each blind hole; the core expanding clamp is convenient to clamp and operate, can quickly clamp workpieces, is particularly suitable for high-precision machining of workpieces with gullies, stripes, small grooves and the like on the inner walls of an aviation bomb body and the like, has small damage to the gullies and the like on the inner walls of the aviation bomb body in the core expanding clamping process, and is beneficial to improving the product percent of pass and the production efficiency.
Description
Technical Field
The invention belongs to the technical field of core expanding clamps, and particularly relates to a core expanding clamp suitable for a workpiece with gully on the inner wall and a using method of the core expanding clamp.
Background
In the processing of part tubular member, to the precision requirement extremely high, take aviation bomb as an example, in the processing production of aviation bomb body shell, to the casing machining precision requirement extremely high of part aviation bomb to guarantee that the bomb can smoothly operate when passing in and out the magazine, throwing in, launching or exploding, the machining precision error of requirement casing is in the millimeter level.
In the processing production of the shell of the air bomb shell, an inner cavity is usually processed on a blank piece; the inner cavity is turned into a cylindrical shape with a constant or gradually changed diameter according to the processing requirements, a plurality of gullies are processed on the inner wall of the shell in the processing of the inner cavity of the shell, the surface of the inner wall of the shell is divided into regular diamond blocks, so that the inner wall of the shell is in a pineapple skin shape, the uniform grain depth is ensured, the crushing effect of the shell in explosion is ensured, and the killing power is increased. The single diamond on the pineapple peel is usually the size of a nail cover, and when the single diamond is subjected to excessive pressure, the whole diamond or the edge of the single diamond can be deformed.
The appearance of the shell of the aviation bomb body is mostly a curve which is suitable for hydromechanics, in order to ensure the integrity of the outer wall of the bomb body, the appearance of the bomb body needs to be cut from the beginning to the end of a tool in numerical control turning, therefore, in order to ensure the continuity of the turning, a core expanding clamp needs to be used for clamping a blank from an inner cavity, so that the turning is not interrupted; to ensure stable clamping, the core expanding clamp can exert a great pressure on the diamond-shaped blocks on the inner cavity, which may cause deformation of the whole or edges of the individual diamond-shaped blocks.
In addition, the common two ends are oppositely fixed, and due to the fact that the diameters of the inner cavities of the shells of the aerial bomb bodies are different, the problem that the shells of the aerial bomb bodies are low in coaxiality with the inner cavities of the shells of the aerial bomb bodies frequently occurs, and products are unqualified is caused.
In addition, as the requirement on the machining precision in the production order is higher and higher, and the product reject ratio is higher and higher, the investigation finds that the currently used core expansion clamp cannot meet the current machining requirement due to the difficulty in ensuring high coaxiality.
In view of the above, it is necessary to provide a core expanding jig capable of maintaining high coaxiality of a workpiece without damaging the inner wall of the workpiece.
Disclosure of Invention
The invention aims to provide a core expanding clamp which does not need excessive core expanding pressure, has small damage to the inner wall of a workpiece and is suitable for the workpiece with gully inner wall.
The invention also aims to provide the expansion core clamp which is convenient to operate and can quickly finish clamping the workpiece.
In order to solve the above technical problems, the present invention discloses an expanding core clamp for a workpiece having gully on an inner wall, for clamping the workpiece from an inner cavity, comprising: the concentric shaft plays a role in supporting, is sleeved on a limiting taper end at one side of the concentric shaft, and is sleeved on a movable taper end at the other side of the concentric shaft;
the limiting taper end is fixedly arranged with the concentric shaft, the movable taper end can slide along the concentric shaft, an external thread is arranged on one side of the concentric shaft close to the movable taper end, and a locking nut is arranged on the external thread section on the concentric shaft; a tubular taper expansion core is sleeved on a concentric shaft between the limiting taper end and the movable taper end;
a plurality of cutting seams are uniformly processed on two sides of the taper expansion core along the length direction, and the taper expansion core is divided into a first expansion core flap group close to a limiting taper end and a second expansion core flap group close to a movable taper end by the cutting seams; the inner walls of the two ends of the taper expansion core are processed with tapers;
a plurality of blind holes are formed in the upper surfaces of the first core expansion flap group and the second core expansion flap group, and a permanent magnet sheet and a movable block are arranged in each blind hole; the permanent magnet sheets are flatly laid and fixed at the bottom of the blind hole.
Preferably, when the core expansion clamp is in a static state, the movable block is adsorbed by the permanent magnet sheet and fixed in the blind hole; when the core expanding clamp rotates at a high speed, part of the movable blocks corresponding to the gullies on the inner wall of the workpiece overcome the magnetic force of the permanent magnet pieces and are separated from the permanent magnet pieces under the action of centrifugal force, and the head parts of the movable blocks enter the gullies on the inner wall of the workpiece, so that the core expanding clamp can be used for powerfully preventing the relative sliding of the workpiece and the core expanding clamp.
Preferably, the movable block is cylindrical or cuboid, and the width of the movable block is adapted to the width of a gully on the inner wall of the workpiece; and the upper part of the movable block is subjected to rounding treatment, so that the movable block can smoothly enter gullies on the inner wall of the workpiece.
Preferably, the movable block material is a high-strength ferromagnetic metal.
Preferably, the maximum suction force of the permanent magnet sheet to the movable block does not exceed 3 times of the self weight of the movable block, so that the movable block can smoothly separate from the permanent magnet sheet under the action of centrifugal force when the core expansion clamp rotates at high speed.
Preferably, the integral height of the permanent magnet pieces and the movable block is smaller than the depth of the blind hole.
Preferably, a clamping protrusion is arranged at one end of the concentric shaft close to the limiting taper end, and a positioning plate is detachably arranged between the limiting taper end and the clamping protrusion; the positioning plate has various models with different sizes and thicknesses for standby.
Preferably, the outer diameter of the first core expansion flap group is not less than that of the second core expansion flap group, and during core expansion fixing operation, the first core expansion flap group finishes fixing the workpiece before the second core expansion flap group.
Preferably, the diameters of the expansion core, the limiting taper end and the movable taper end are slightly smaller than the inner diameter of the workpiece.
When the core expanding clamp is used, an inner cavity of a workpiece is aligned to a concentric shaft and is fed from one side of a movable taper end until the workpiece abuts against a positioning plate, and a locking nut is screwed so that the core expanding fixing and initial core expanding fixing of the inner cavity of the workpiece are successively completed on one side of the taper end close to the limit position and one side of the taper end close to the movable taper end of the taper expanding core; after the core expanding clamp starts to rotate, the movable block is separated from the permanent magnet pieces under the action of centrifugal force, and the head parts of part of the movable block enter gullies on the inner wall of the workpiece, so that the workpiece is further fixed.
The core expanding clamp suitable for the workpiece with gully on the inner wall has at least the following advantages:
1. the method is particularly suitable for high-precision machining of workpieces with gullies, stripes, small grooves and the like on the inner walls of the aerial bomb bodies and the like, and is beneficial to improving the product qualification rate and the production efficiency because the damage to the gullies and the like on the inner walls of the aerial bomb bodies is small in the core expanding and clamping process.
2. Even for workpieces with different inner diameters, the expansion core clamping of the workpieces can be easily realized through the first expansion core flap group and the second expansion core flap group on two sides of the taper expansion core, the first expansion core flap group and the second expansion core flap group are positioned on the same taper expansion core, the workpieces can reach high coaxiality more easily during expansion core clamping and machining, and the parallelism of each end face and the high-precision coaxiality of the inner cavity are kept.
3. The first core expansion valve group and the second core expansion valve group finish primary core expansion fixing of the inner cavity of the workpiece; after the core expanding clamp starts to rotate, the head of the top column of part of the movable blocks enters the gullies on the inner wall of the workpiece under the action of centrifugal force, so that the workpiece is further fixed. The movable blocks have good adaptability to various inner wall gullies of the workpiece, most of the movable blocks are prevented from remaining in the blind holes by the inner cavity wall of the workpiece after the initial expansion core fixing is finished and the movable blocks start to rotate, and the heads of the movable blocks corresponding to the gullies on the inner cavity wall of the workpiece enter the gullies under the action of centrifugal force to provide enough resistance along the tangential direction of the inner cavity of the workpiece, so that the expansion core fixture disclosed by the invention can achieve a sufficient expansion core fixing effect without outputting excessive static friction force, namely without applying excessive pressure on the first radial sliding block group and the second radial sliding block group, and the damage of the expansion core fixture to the inner wall of the workpiece can be reduced.
4. When static, the movable block is fixed in the blind hole by the absorption, and the movable block just exposes the blind hole when the core anchor clamps that rise are rotatory, and after processing is accomplished, the core anchor clamps that rise loosen and take off, in the movable block gets back to the blind hole again under the magnetic force effect, this makes and all makes things convenient for when the installation with dismantle the work piece.
5. By replacing the movable blocks of different types, the device can adapt to gullies in the inner wall of the workpiece of different types, and is flexible and convenient.
6. Through the fixation of the locking nut, the stable fixing effect can be achieved only by once clamping, the operation is convenient, and the clamping efficiency is high.
7. The expansion core, the positioning plate and the radial sliding block can be conveniently detached and exchanged, and the expansion core has good adaptability to workpieces of different types.
Drawings
Fig. 1 is a schematic structural view of an expanding core clamp suitable for a workpiece having gullies on its inner wall.
Fig. 2 is a schematic view of a concentric shaft.
Fig. 3 is a schematic structural view of an active taper end.
Fig. 4 is a structural schematic diagram of a tapered expanding core.
Fig. 5 is a schematic view of the cross-sectional structure of the taper expansion core in the direction A.
The reference numbers in the figures are: 1-concentric shaft, 101-external thread, 2-limit taper end, 3-movable taper end, 4-locking nut, 5-taper expansion core, 501-cutting slot, 502-first expansion core petal set, 503-second expansion core petal set, 6-blind hole, 7-permanent magnet sheet, 8-movable block, 9-clamping protrusion and 10-positioning plate.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," when used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
Example 1
1-5, an expanding core clamp for a workpiece having a gully in an inner wall thereof for clamping the workpiece from an inner cavity, comprising: the device comprises a concentric shaft 1 for supporting, a limiting taper end 2 sleeved on one side of the concentric shaft, and a movable taper end 3 sleeved on the other side of the concentric shaft;
the limiting taper end is fixedly arranged with the concentric shaft, the movable taper end can slide along the concentric shaft, an external thread 101 is arranged on one side of the concentric shaft close to the movable taper end, and a locking nut 4 is arranged on the external thread section on the concentric shaft; a tubular taper expansion core 5 is sleeved on a concentric shaft between the limit taper end and the movable taper end; the locking nut is used for pushing the movable taper end to be close to the limiting taper end, so that the first core expansion valve group and the second core expansion valve group on the taper expansion core are gradually expanded, and the inner wall of a workpiece is pressed to finish primary core expansion clamping.
A plurality of cutting seams 501 are uniformly processed on two sides of the taper expansion core along the length direction, and the taper expansion core is divided into a first expansion core flap 502 group close to a limiting taper end and a second expansion core flap 503 group close to a movable taper end by the cutting seams; the inner walls of the two ends of the taper expansion core are processed with tapers; in this embodiment, each of the first core-expanding flap group and the second core-expanding flap group includes six core-expanding flaps.
A plurality of blind holes 6 are formed in the upper surfaces of the first core expansion flap group 502 and the second core expansion flap group 503, and a permanent magnet sheet 7 and a movable block 8 are arranged in each blind hole; the permanent magnet sheets are flatly laid and fixed at the bottom of the blind hole.
When the core expansion clamp is in a static state, the movable block is adsorbed by the permanent magnet sheet and fixed in the blind hole; when the core expanding clamp rotates at a high speed, part of the movable blocks corresponding to the gullies on the inner wall of the workpiece overcome the magnetic force of the permanent magnet pieces and are separated from the permanent magnet pieces under the action of centrifugal force, and the head parts of the movable blocks enter the gullies on the inner wall of the workpiece, so that the core expanding clamp can be used for powerfully preventing the relative sliding of the workpiece and the core expanding clamp.
The movable block 8 is cylindrical or cuboid, and the width of the movable block is adapted to the width of gullies on the inner wall of the workpiece; and the upper part of the movable block is subjected to rounding treatment, so that the movable block can smoothly enter gullies on the inner wall of the workpiece.
The movable block is made of high-strength ferromagnetic metal. The permanent magnet sheet adsorbs the movable block, so that the movable block can be stably bound in the blind hole in a non-use state, and when the core expansion clamp starts to rotate and reaches a certain rotating speed, the movable block is separated from the permanent magnet sheet under the action of centrifugal force; after the processing is finished, the core expansion clamp stops rotating, and after the taper core expansion is loosened, the movable block returns to the blind hole under the magnetic force of the permanent magnet piece, so that the processed workpiece is conveniently taken out.
The maximum suction force of the permanent magnet sheet to the movable block does not exceed 3 times of the dead weight of the movable block, so that the movable block can smoothly separate from the permanent magnet sheet under the action of centrifugal force when the core expansion clamp rotates at high speed.
The whole height of the permanent magnet pieces and the movable blocks is smaller than the depth of the blind holes, and the movable blocks do not expose out of the blind holes in a static state, so that a blank workpiece can be smoothly loaded with the expansion core clamp.
A clamping protrusion 9 is arranged at one end of the concentric shaft close to the limiting taper end, and a positioning plate 10 is detachably arranged between the limiting taper end and the clamping protrusion; the positioning plate has various models with different sizes and thicknesses for standby. The clamping protrusions play a role in preventing the positioning plate from sliding, and the positioning plates and the expansion cores in different styles are selected according to different workpieces, so that the first expansion core flap group and the second expansion core flap group can be clamped at specific positions of the inner wall of the workpiece.
The outer diameter of the first core expansion valve group is not smaller than that of the second core expansion valve group, and when the core expansion is fixed, the first core expansion valve group finishes fixing a workpiece before the second core expansion valve group. When the core that rises fixed operation, the nearly spacing tapering end one side of tapering core that rises accomplishes the fixed to the work piece earlier, prevents that the phenomenon of the clamping insecure that the core one end of tapering rise is virtual to be pressed from both sides and leads to, and the second core lamella group that rises is owing to be close to lock nut, can be more easily adjusted.
The diameters of the expansion core, the limiting taper end and the movable taper end are slightly smaller than the inner diameter of the workpiece, so that the workpiece can be smoothly sleeved on the concentric shaft during initial installation.
Example 2
When the core expanding clamp is used, an inner cavity of a workpiece is aligned to a concentric shaft and is fed from one side of a movable taper end until the workpiece abuts against a positioning plate, and a locking nut is screwed so that the core expanding fixing and initial core expanding fixing of the inner cavity of the workpiece are successively completed on one side of the taper end close to the limit position and one side of the taper end close to the movable taper end of the taper expanding core; after the core expanding clamp starts to rotate, the movable block is separated from the permanent magnet pieces under the action of centrifugal force, and the head parts of part of the movable block enter gullies on the inner wall of the workpiece, so that the workpiece is further fixed.
After the expansion core fixing operation is completed, the locking nut still needs to be partially exposed out of the workpiece, so that the locking nut can be screwed in or out conveniently by adopting a tool, and the locking nut needs to have enough length so as to complete the adjustment work of the movable taper end.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.
Claims (10)
1. An expanding core clamp for a workpiece having a gully in an inner wall thereof for clamping the workpiece from an inner cavity, comprising: the concentric shaft plays a role in supporting, is sleeved on a limiting taper end at one side of the concentric shaft, and is sleeved on a movable taper end at the other side of the concentric shaft;
the limiting taper end is fixedly arranged with the concentric shaft, the movable taper end can slide along the concentric shaft, an external thread is arranged on one side of the concentric shaft close to the movable taper end, and a locking nut is arranged on the external thread section on the concentric shaft; a tubular taper expansion core is sleeved on a concentric shaft between the limiting taper end and the movable taper end;
a plurality of cutting seams are uniformly processed on two sides of the taper expansion core along the length direction, and the taper expansion core is divided into a first expansion core flap group close to a limiting taper end and a second expansion core flap group close to a movable taper end by the cutting seams; the inner walls of the two ends of the taper expansion core are processed with tapers;
a plurality of blind holes are formed in the upper surfaces of the first core expansion flap group and the second core expansion flap group, and a permanent magnet sheet and a movable block are arranged in each blind hole; the permanent magnet sheets are flatly laid and fixed at the bottom of the blind hole.
2. The core expanding clamp suitable for workpieces with ravines on inner walls as claimed in claim 1, wherein the core expanding clamp is in a static state, and the movable block is adsorbed by the permanent magnet pieces and fixed in the blind hole; when the core expanding clamp rotates at a high speed, part of the movable blocks corresponding to the gullies on the inner wall of the workpiece overcome the magnetic force of the permanent magnet pieces and are separated from the permanent magnet pieces under the action of centrifugal force, and the head parts of the movable blocks enter the gullies on the inner wall of the workpiece, so that the core expanding clamp can be used for powerfully preventing the relative sliding of the workpiece and the core expanding clamp.
3. The core expanding fixture for a workpiece with gullies on the inner wall as claimed in claim 2, wherein the movable block is cylindrical or rectangular, and the width of the movable block is adapted to the gully width on the inner wall of the workpiece; and the upper part of the movable block is subjected to rounding treatment, so that the movable block can smoothly enter gullies on the inner wall of the workpiece.
4. The core expanding fixture for workpieces with corrugations in the inner walls as claimed in claim 3, wherein the movable block material is high-strength ferromagnetic metal.
5. The core expanding clamp for a workpiece with ravines in the inner wall as claimed in claim 4, wherein the maximum suction force of the permanent magnet pieces to the movable blocks is not more than 3 times of the dead weight of the movable blocks, so that the movable blocks can be smoothly separated from the permanent magnet pieces under the action of centrifugal force when the core expanding clamp rotates at high speed.
6. The core expanding clamp for workpieces with ravines on inner walls as claimed in claim 5, wherein the whole height of the permanent magnet pieces and the movable blocks is less than the depth of the blind holes.
7. The core expanding clamp suitable for workpieces with gullies on the inner walls as claimed in claim 6, wherein a retaining protrusion is provided on one end of the concentric shaft near the limiting taper end, and a retaining plate is detachably mounted between the limiting taper end and the retaining protrusion; the positioning plate has various models with different sizes and thicknesses for standby.
8. The core expanding fixture for workpieces with corrugations in the inner wall as claimed in claim 7, wherein the outer diameter of the first core expanding flap set is not smaller than the outer diameter of the second core expanding flap set, and the first core expanding flap set completes the fixing of the workpiece before the second core expanding flap set during the core expanding fixing operation.
9. The core expanding fixture for workpieces with ravines in the inner walls as claimed in claim 8, wherein the diameters of the tapered core expanding, the limiting taper end and the movable taper end are slightly smaller than the inner diameter of the workpiece.
10. The use method of the core expanding clamp suitable for a workpiece with gullies on the inner wall as claimed in claim 9, wherein in use, the inner cavity of the workpiece is aligned with the concentric shaft, the workpiece is fed from one side of the movable taper end until the workpiece abuts against the positioning plate, and the lock nut is screwed so that the side of the taper expanding core close to the limit taper end and the side of the taper expanding end close to the movable taper end successively complete the initial core expanding fixation of the inner cavity of the workpiece; after the core expanding clamp starts to rotate, the movable block is separated from the permanent magnet pieces under the action of centrifugal force, and the head parts of part of the movable block enter gullies on the inner wall of the workpiece, so that the workpiece is further fixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910410682.6A CN110102792B (en) | 2019-05-17 | 2019-05-17 | Core expanding clamp suitable for workpiece with gully on inner wall and using method of core expanding clamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910410682.6A CN110102792B (en) | 2019-05-17 | 2019-05-17 | Core expanding clamp suitable for workpiece with gully on inner wall and using method of core expanding clamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110102792A CN110102792A (en) | 2019-08-09 |
| CN110102792B true CN110102792B (en) | 2020-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910410682.6A Active CN110102792B (en) | 2019-05-17 | 2019-05-17 | Core expanding clamp suitable for workpiece with gully on inner wall and using method of core expanding clamp |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114101504B (en) * | 2021-10-15 | 2024-01-23 | 内蒙古工业大学 | Universal fixture for heat setting of metal vascular stent |
| CN114800366B (en) * | 2022-05-10 | 2023-05-02 | 中船重工中南装备有限责任公司 | Circular electric connector dismounting device for specific space |
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| CN202804227U (en) * | 2012-10-18 | 2013-03-20 | 宁波勋辉电器有限公司 | Elastic mandrel positioning fixture of turning thin-walled part |
| CN104190977A (en) * | 2014-07-29 | 2014-12-10 | 南通理工学院 | Cylindrical workpiece excircle machining clamp and using method thereof |
| CN105252032A (en) * | 2015-10-13 | 2016-01-20 | 永安市培鑫工贸有限公司 | Valve body clamp |
| CN206083898U (en) * | 2016-11-01 | 2017-04-12 | 浙江解放机械制造有限公司 | Anchor clamps of thin wall circle cylinder part outer wall processing usefulness |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US95065A (en) * | 1869-09-21 | Improved expanding mandrel | ||
| DE398999C (en) * | 1922-12-14 | 1924-07-31 | Fritz Richard Deuring | Clamping body for turning jaws |
| CN202804227U (en) * | 2012-10-18 | 2013-03-20 | 宁波勋辉电器有限公司 | Elastic mandrel positioning fixture of turning thin-walled part |
| CN104190977A (en) * | 2014-07-29 | 2014-12-10 | 南通理工学院 | Cylindrical workpiece excircle machining clamp and using method thereof |
| CN105252032A (en) * | 2015-10-13 | 2016-01-20 | 永安市培鑫工贸有限公司 | Valve body clamp |
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| CN110102792A (en) | 2019-08-09 |
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