CN110102794B - Core expanding clamp for workpiece with gully on inner wall and using method of core expanding clamp - Google Patents
Core expanding clamp for workpiece with gully on inner wall and using method of core expanding clamp Download PDFInfo
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- CN110102794B CN110102794B CN201910410687.9A CN201910410687A CN110102794B CN 110102794 B CN110102794 B CN 110102794B CN 201910410687 A CN201910410687 A CN 201910410687A CN 110102794 B CN110102794 B CN 110102794B
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- workpiece
- taper end
- core
- concentric shaft
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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
-
- 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
Abstract
An expanding core clamp for a workpiece with gullies on the inner wall, comprising: the limiting taper end socket is sleeved on one side of the concentric shaft, and the movable taper end socket is sleeved on the other side of 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 expansion core is sleeved on a concentric shaft between the limiting taper end and the movable taper end; a plurality of through holes are uniformly formed in the circumferences of two sides of the expansion core, and radial sliding blocks are arranged in the through holes; the upper surface of the radial sliding block is provided with a plurality of blind holes, and a movable block is 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 for a workpiece with gully 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 has small damage to the inner wall of a workpiece and is used 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, which is used for clamping the workpiece from an inner cavity, and comprises: 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 expansion core is sleeved on a concentric shaft between the limiting taper end and the movable taper end; a plurality of through holes are uniformly formed in the circumferences of two sides of the expansion core, radial sliding blocks are arranged in the through holes, and the bottoms of the radial sliding blocks are inclined planes which are matched with the taper of the limiting taper end or the movable taper end; the radial sliding block is divided into a first radial sliding block group close to the limiting taper end and a second radial sliding block group close to the movable taper end;
the radial sliding block is characterized in that a plurality of blind holes are machined in the upper surface of the radial sliding block, and a movable block is arranged in each blind hole.
Preferably, the movable block comprises a base with a threaded hole and a top column vertically installed on the base through the threaded hole;
the inner side of the upper edge of the blind hole is provided with an anti-drop ring, and a pair of notches is symmetrically arranged on the anti-drop ring.
Preferably, the thickness of the base is smaller than the width of the notch on the anti-slip ring, and the diameter of the base is larger than the inner diameter of the anti-slip ring; the base can enter the blind hole through the notch on the anti-slip ring and is not easy to slip.
Preferably, the height of the top pillar is smaller than the depth of the blind hole, and the diameter of the top pillar is smaller than the inner diameter of the anti-drop ring; the top pillar is cylindrical, and the diameter of the top pillar is matched with the width of a gully on the inner wall of the workpiece.
Preferably, the upper portion of the top pillar is rounded so that the top pillar can smoothly enter into the gullies in the inner wall of the workpiece.
Preferably, the coaxial positioning device is characterized in that a clamping protrusion is arranged at one end, close to the limiting taper end, of the concentric shaft, and a positioning plate is detachably arranged between the limiting taper end and the clamping protrusion.
Preferably, the positioning plate has various models with different sizes and thicknesses for standby.
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, the workpiece 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 a first radial sliding block group and a second radial sliding block group complete preliminary core expanding fixation on 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.
Preferably, after the expansion core fixing operation is completed, the locking nut is still partially exposed out of the workpiece.
The core expanding clamp for the workpiece with gully on the inner wall has the advantages that:
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 if to the work piece that the internal diameter size is inconsistent, through the radial sliding block set of first radial sliding block group and the radial sliding block set of second of core both sides that rises, the core clamping that rises to the work piece of realization that can be easy, first radial sliding block set and the radial sliding block set of second are in on the same core that rises, make the work piece reach high axiality more easily when the core clamping that rises with add man-hour, make the depth of parallelism of each terminal surface and keep high accuracy coaxial with the inner chamber.
3. The first radial sliding block group and the second radial sliding block group finish the preliminary expansion core fixation 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. The blind hole just exposes to the movable block when the core anchor clamps that rise are rotatory (the blind hole can be exposed naturally to the partial slider of bottom under the action of gravity, but the influence is little), and is all convenient when the installation with dismantle the work piece.
5. By replacing different types of top pillars, the device can adapt to gullies in the inner wall of a workpiece without the 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 view of an expanding core clamp 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 schematic view of the A-direction cross-section of the expanding core.
Fig. 5 is a schematic structural diagram of a blind hole.
The reference numbers in the figures are: 1-concentric shaft, 101-external thread, 2-limiting taper end, 3-movable taper end, 4-locking nut, 5-expanding core, 6-radial slide block, 610-first radial slide block group, 620-second radial slide block group, 7-blind hole, 710-anti-slip ring, 720-notch, 8-movable block, 810-base, 820-top column, 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 on 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 2 is fixedly installed with the concentric shaft 1, 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; the locking nut is used for pushing the movable taper end to be close to the limiting taper end, so that the first radial sliding block set and the second radial sliding block set on the expansion core are gradually opened, and the inner wall of a workpiece is pressed to finish primary expansion core clamping.
A tubular expansion core 5 is sleeved on a concentric shaft between the limiting taper end 2 and the movable taper end 3; a plurality of through holes are uniformly formed in the circumferences of two sides of the expansion core, radial sliding blocks 6 are arranged in the through holes, and the bottoms of the radial sliding blocks are inclined planes which are matched with the taper of the limiting taper end or the movable taper end; the radial sliding blocks are divided into a first radial sliding block group 610 close to a limiting taper end and a second radial sliding block group 620 close to a movable taper end; the first radial sliding block group and the second radial sliding block group respectively clamp the expanding cores on two sides of the inner cavity of the workpiece, and the radial sliding block group and the expanding core clamping device are particularly suitable for high-coaxiality machining of long workpieces. In this embodiment, first radial sliding block group and the radial sliding block group of second respectively have the radial slider of 4 symmetries, and generally speaking, first radial sliding block group and the radial sliding block group of second have 3-6 radial sliders can satisfy the core expansion clamp dress requirement, and the radial slider quantity of first radial sliding block group and the radial sliding block group of second can be different. The side edges of the upper part and the lower part of the radial sliding block can be provided with bulges so as to prevent the radial sliding block from easily slipping off from the through hole.
The radial sliding block is characterized in that a plurality of blind holes 7 are formed in the upper surface of the radial sliding block, and a movable block 8 is arranged in each blind hole.
The movable block comprises a base 810 with a threaded hole and a top column 820 vertically installed on the base through the threaded hole;
an anti-drop ring 710 is arranged on the inner side of the upper edge of the blind hole, and a pair of notches 720 is symmetrically arranged on the anti-drop ring.
The thickness of the base is smaller than the width of the notch on the anti-falling ring, and the diameter of the base is larger than the inner diameter of the anti-falling ring; the base can enter the blind hole through the notch on the anti-slip ring and is not easy to slip. After the base is placed into the blind hole from the notch, the base is laid down to the bottom of the blind hole and then the top column is installed, and no matter how the movable block swings, the movable block cannot slide out of the blind hole.
The height of the top column is smaller than the depth of the blind hole, and the diameter of the top column is smaller than the inner diameter of the anti-drop ring; the top pillar is cylindrical, and the diameter of the top pillar is matched with the width of a gully on the inner wall of the workpiece.
And the upper part of the top pillar is subjected to rounding treatment, so that the top pillar can smoothly enter gullies on the inner wall of the workpiece.
The coaxial limiting taper device is characterized in that a clamping protrusion 9 is arranged at one end, close to the limiting taper end, of the concentric shaft, 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 plates from sliding, and the positioning plates and the expansion cores in different styles are selected according to different workpieces, so that the first radial sliding block set and the second radial sliding block set can be clamped at specific positions of the inner wall of the workpiece.
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. The workpiece can be smoothly sleeved on the concentric shaft during initial assembly. The invention can be used with cutting equipment with high rotating speed.
Example 2
When the core expanding clamp is used, an inner cavity of a workpiece is aligned to a concentric shaft, the workpiece 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 a first radial sliding block group and a second radial sliding block group complete preliminary core expanding fixation on 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.
After the expansion core fixing operation is completed, the locking nut is still 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 expansion core is sleeved on a concentric shaft between the limiting taper end and the movable taper end; a plurality of through holes are uniformly formed in the circumferences of two sides of the expansion core, radial sliding blocks are arranged in the through holes, and the radial sliding blocks are divided into a first radial sliding block group close to a limiting taper end and a second radial sliding block group close to a movable taper end; the bottom of the first radial sliding block group is an inclined plane which is adaptive to the taper of the limiting taper end, and the bottom of the second radial sliding block group is an inclined plane which is adaptive to the taper of the movable taper end;
the upper surface of the radial sliding block is provided with a plurality of blind holes, and a movable block is arranged in each blind hole.
2. The core expanding clamp for a workpiece with ravines on the inner wall as claimed in claim 1, wherein the movable block comprises a base with a threaded hole and a top pillar vertically mounted on the base through the threaded hole;
the inner side of the upper edge of the blind hole is provided with an anti-drop ring, and a pair of notches is symmetrically arranged on the anti-drop ring.
3. The core expanding fixture for workpieces with ravines in the inner wall as claimed in claim 2, wherein the base has a thickness smaller than the width of the gap on the anti-slip ring, and a diameter larger than the inner diameter of the anti-slip ring; the base can enter the blind hole through the notch on the anti-slip ring and is not easy to slip.
4. The core expanding fixture for workpieces with ravines in the inner walls as claimed in claim 3, wherein the height of the top pillars is less than the depth of the blind holes, and the diameter of the top pillars is less than the inner diameter of the anti-slip ring; the top pillar is cylindrical, and the diameter of the top pillar is matched with the width of a gully on the inner wall of the workpiece.
5. The core expanding jig for a workpiece having ravines in the inner wall as claimed in claim 4, wherein the upper portion of the top pillar is ground to allow the top pillar to smoothly enter the ravines in the inner wall of the workpiece.
6. The core expanding clamp for workpieces with gullies on the inner walls as claimed in claim 5, wherein a retaining protrusion is provided on the concentric shaft near the limiting taper end, and a retaining plate is detachably mounted between the limiting taper end and the retaining protrusion.
7. The core expanding fixture for workpieces with ravines in the inner walls as claimed in claim 6, wherein the positioning plate has multiple models with different sizes and thicknesses for standby.
8. The core expansion fixture for workpieces with ravines in the inner walls as claimed in claim 7, wherein the diameters of the core expansion, the limiting taper end and the movable taper end are slightly smaller than the inner diameter of the workpiece.
9. The use method of the core expanding clamp for a workpiece with gullies on the inner wall as claimed in claim 8, 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 to enable the first radial slide block set and the second radial slide block set to complete the initial core expanding fixation on 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.
10. The method of claim 9, wherein the lock nut is partially exposed after the core-expanding fastening operation is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910410687.9A CN110102794B (en) | 2019-05-17 | 2019-05-17 | Core expanding clamp 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 |
|---|---|---|---|
| CN201910410687.9A CN110102794B (en) | 2019-05-17 | 2019-05-17 | Core expanding clamp for workpiece with gully on inner wall and using method of core expanding clamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110102794A CN110102794A (en) | 2019-08-09 |
| CN110102794B true CN110102794B (en) | 2020-08-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910410687.9A Active CN110102794B (en) | 2019-05-17 | 2019-05-17 | Core expanding clamp for workpiece with gully on inner wall and using method of core expanding clamp |
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| CN (1) | CN110102794B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110744150B (en) * | 2019-10-21 | 2020-07-28 | 河北华丰能源科技发展有限公司 | Lathe suitable for processing internal thread |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2525103A1 (en) * | 1975-06-05 | 1976-12-23 | Horst Mathiszik | Lathe hollow spindle stop - incorporates conical part with tension screw and three jaws pressable against spindl inner wall |
| CN202741777U (en) * | 2012-09-17 | 2013-02-20 | 江苏飞船股份有限公司 | Double-headed core expansion type spindle clamp |
| CN203725807U (en) * | 2014-01-09 | 2014-07-23 | 江苏兄弟活塞有限公司 | Sleeve part machining fixture |
| CN105252032B (en) * | 2015-10-13 | 2017-11-21 | 永安市培鑫工贸有限公司 | A kind of valve body fixture |
| CN206296482U (en) * | 2016-12-09 | 2017-07-04 | 辽沈工业集团有限公司 | A kind of thin-wall barrel clamp for machining |
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2019
- 2019-05-17 CN CN201910410687.9A patent/CN110102794B/en active Active
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