CN112705966A - Internal supporting and clamping fixture for precise thin-walled piece - Google Patents
Internal supporting and clamping fixture for precise thin-walled piece Download PDFInfo
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- CN112705966A CN112705966A CN202011351041.7A CN202011351041A CN112705966A CN 112705966 A CN112705966 A CN 112705966A CN 202011351041 A CN202011351041 A CN 202011351041A CN 112705966 A CN112705966 A CN 112705966A
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- thin
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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
- B23Q3/062—Work-clamping means adapted for holding workpieces having a special form or being made from a special material
- B23Q3/064—Work-clamping means adapted for holding workpieces having a special form or being made from a special material for holding elongated workpieces, e.g. pipes, bars or profiles
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Abstract
The invention provides an internal supporting and clamping fixture for a precise thin-walled workpiece, which is used for solving the technical problems of complex structure, inconvenience in installation and disassembly, difficulty in clamping the thin-walled workpiece, low positioning accuracy, instable clamping, easiness in deformation of the thin-walled workpiece and self-excited vibration in the cutting process and the like of the conventional thin-walled workpiece clamping fixture. The thin-wall workpiece clamping device comprises a thin-wall workpiece, wherein a clamping base body is arranged at the bottom of the thin-wall workpiece, a pressing component is arranged at the top of the thin-wall workpiece, a positioning pull rod is axially arranged in the thin-wall workpiece, two ends of the positioning pull rod are respectively fixedly connected with the clamping base body and the pressing component, and a tensioning component is arranged on the positioning pull rod. The thin-wall workpiece positioning and clamping device is simple in integral structure, easy to install and disassemble, stable in clamping of the thin-wall workpiece, capable of preventing the change of the shape and position sizes of the inner hole size, the hole cylindricity and the like of the thin-wall workpiece, improving the positioning and clamping quality of the thin-wall workpiece, avoiding the deformation and self-excited vibration of the thin-wall workpiece in the cutting process, and improving the processing surface quality and the processing efficiency of the thin-wall workpiece.
Description
Technical Field
The invention relates to the technical field of machining, in particular to an inner support clamping fixture for a precise thin-walled workpiece.
Background
Thin-walled pipe fittings are often used in the modern industry, and in order to make the thin-walled pipe fittings better fit with other parts in equipment, the outer circle of the thin-walled pipe fitting is often required to be machined. In the spinning process of the excircle of the thin-wall pipe, because the thin-wall pipe is thin in thickness and small in rigidity, the thin-wall pipe needs to be clamped and positioned by a clamp in order to facilitate processing and ensure processing precision. The existing thin-wall part clamping fixture has a complex structure, is inconvenient to install and disassemble, is difficult to clamp, and generally has the problems of clamping deformation or thin-wall part deformation caused by cutting force in the machining process; for precision thin-wall part products, the form and position tolerance is generally required to be very tight, for example, the cylindricity of an inner hole is less than 0.03mm, but the positioning precision of the existing clamp is low, and the clamp is unstable in the processing process, so that the original size precision and the form and position tolerance of a thin-wall workpiece are relatively large. At present, an auxiliary supporting structure with internal point contact or line contact is generally used for processing thin-walled workpieces, although the auxiliary supporting structure can play a role in positioning, local deformation and self-excited vibration of the thin-walled workpieces can occur in the cutting process, and the influence on the service life of a cutter and the processing quality of a product is exerted; some clamps adopt an internal filling mode, but the auxiliary period is long, and the clamps are not suitable for batch products.
Disclosure of Invention
The invention provides an internal supporting clamping fixture for a precise thin-wall piece, which is simple in integral structure, easy to install and disassemble, stable in clamping of the thin-wall piece, capable of preventing the shape and position sizes of the inner hole size, the hole cylindricity and the like of the thin-wall piece from changing, improving the positioning clamping quality of the thin-wall piece, avoiding the deformation and self-excited vibration of the thin-wall piece in the cutting process, and improving the processing surface quality and the processing efficiency of the thin-wall piece, and aims to solve the technical problems that the existing clamping fixture for the thin-wall piece is complex in structure, inconvenient to install and disassemble, difficult to clamp the thin-wall piece, low in positioning precision, unstable in clamping, easy to deform and self-.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides an accurate thin wall spare internal stay clamping anchor clamps, includes the thin wall work piece, the bottom of thin wall work piece is provided with the centre gripping base member, the top is provided with compresses tightly the subassembly, and the inside axial of thin wall work piece is provided with the location pull rod, and the both ends of location pull rod are respectively with centre gripping base member and compress tightly subassembly fixed connection, and the cover is equipped with to prop tight subassembly on the location pull rod.
The tightening assembly comprises a tightening pressure plate, an auxiliary gasket and a clamp spring, the tightening pressure plate and the auxiliary gasket are arranged at intervals along the radial direction of the thin-wall workpiece, through holes matched with the positioning pull rod are formed in the tightening pressure plate and the auxiliary gasket, and the tightening pressure plate and the auxiliary gasket are sleeved on the positioning pull rod through the through holes; the clamp spring is sleeved outside the supporting force pressing sheet and the auxiliary gasket.
The outside cover of jump ring is equipped with and props tight cover, and props tight cover and thin wall work piece clearance fit.
The positioning pull rod comprises a main positioning pull rod and an auxiliary positioning pull rod, the main positioning pull rod is arranged along the axis of the thin-wall workpiece, the auxiliary positioning pull rod is positioned on the outer side of the main positioning pull rod, the lower ends of the main positioning pull rod and the auxiliary positioning pull rod are connected with the clamping base body, and the upper ends of the main positioning pull rod and the auxiliary positioning pull rod are connected with the pressing assembly.
The number of the auxiliary positioning pull rods is 3, the auxiliary positioning pull rods are circumferentially and uniformly arranged on the outer side of the main positioning pull rod, and the diameter of each auxiliary positioning pull rod is smaller than that of each main positioning pull rod.
The lower ends of the main positioning pull rod and the auxiliary positioning pull rod are provided with external threads, first threaded holes matched with the main positioning pull rod and the auxiliary positioning pull rod are formed in the clamping base body respectively, and the main positioning pull rod and the auxiliary positioning pull rod are in threaded connection with the clamping base body.
The pressing component comprises a positioning pressing plate, a pressing nut and a pressing screw, the positioning pressing plate is arranged at the top of the thin-wall workpiece, external threads are arranged outside the pressing nut, a second threaded hole matched with the pressing nut is formed in the positioning pressing plate, and the pressing nut is in threaded connection with the positioning pressing plate; the top of the main positioning pull rod is provided with a third threaded hole, the compression nut is provided with a fourth threaded hole, the third threaded hole and the fourth threaded hole are matched with the compression screw, the upper part of the compression screw is in threaded connection with the compression nut, and the lower part of the compression screw penetrates through the compression nut and is in threaded connection with the main positioning pull rod.
The invention has simple integral structure and easy assembly and disassembly, realizes the deformation control of the upper and lower ports of the thin-wall workpiece by clamping the thin-wall workpiece between the clamping base body and the positioning pressing plate, simultaneously realizes the complete positioning and clamping of the thin-wall workpiece by utilizing the fixed connection of the positioning pull rod with the clamping base body and the compression screw respectively and matching with the fixed connection of the compression nut with the positioning pressing plate and the compression screw respectively, prevents the shape and position sizes of the inner hole size, the hole cylindricity and the like of the thin-wall workpiece from changing, and improves the positioning and clamping quality of the thin-wall workpiece; the tightening component can ensure uniform circumferential radial stress of the thin-wall workpiece, further ensure a stable state in the machining process, simultaneously avoid deformation and self-excited vibration of the thin-wall workpiece in the cutting process, and improve the machining surface quality and the machining efficiency of the thin-wall workpiece.
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 an exploded view of the present invention;
FIG. 2 is a structural cross-sectional view of the present invention;
FIG. 3 is a schematic view of the structure of the holding-force wafer and the auxiliary pad of the present invention.
In the figure, 1 is a clamping base body, 2 is a supporting force pressing sheet, 3 is an auxiliary gasket, 4 is a clamp spring, 5 is an auxiliary positioning pull rod, 6 is a tensioning sleeve, 7 is a thin-wall workpiece, 8 is a positioning pressing plate, 9 is a compression nut, 10 is a compression screw and 11 is a main positioning pull rod.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1 and 2, the invention provides an inner supporting and clamping fixture for a precision thin-walled workpiece, which comprises a thin-walled workpiece 7, wherein the bottom of the thin-walled workpiece 7 is provided with a clamping base 1, and the top of the thin-walled workpiece 7 is provided with a pressing component, namely, the thin-walled workpiece 7 is clamped between the clamping base 1 and the pressing component. The inner part of the thin-wall workpiece 7 is axially provided with a positioning pull rod, and two ends of the positioning pull rod are respectively fixedly connected with the clamping base body 1 and the pressing component, so that the thin-wall workpiece 7 is axially positioned. The positioning pull rod is sleeved with the tightening component, and when the pressing component presses downwards, the tightening component is expanded under pressure, so that the clamping stability of the thin-wall workpiece is improved, the main vibration and the self-excited vibration in the process of cutting the thin-wall workpiece are reduced, and the quality and the processing efficiency of the processing surface of the thin-wall workpiece are improved.
Further, for guaranteeing to prop up the evenly distributed of position precision and the tightening force between the subassembly, prop up the subassembly including propping power preforming 2, auxiliary shim 3 and jump ring 4, specifically as shown in fig. 3, propping power preforming 2 and auxiliary shim 3 set up along the radial interval of thin wall work piece 7, and prop up and all set up on power preforming 2 and the auxiliary shim 3 with the perforation of positioning pull rod assorted, propping power preforming 2 and auxiliary shim 3 all overlap through the perforation cover and establish on the positioning pull rod, jump ring 4 cover is established in the outside of propping power preforming 2 and auxiliary shim 3, when realizing compressing tightly the subassembly and pushing down, jump ring 4 takes place radial deformation and provides the tightening force, in this embodiment, utilize jump ring 4 to provide the tightening force, its adjustable tightening degree is about 0.2 mm. In order to uniformly transmit the radial supporting force of the clamp spring 4 to the inner hole of the thin-wall workpiece 7, a tensioning sleeve 6 is sleeved outside the clamp spring 4, a through opening is axially processed at the outer circle of the tensioning sleeve 6, the tensioning sleeve 6 is in clearance fit with the thin-wall workpiece 7, and the supporting force of the clamp spring 4 is balanced by the tensioning sleeve 6 so as to prevent the shape and position sizes of the inner hole size, the hole cylindricity and the like of the thin-wall workpiece 7 from changing. In this embodiment, the height difference between the tightening assembly, the tightening sleeve 6 and the thin-wall workpiece 7 is generally 0.15mm-0.25mm, that is, the thin-wall workpiece 7 is higher than the tightening assembly and the tightening sleeve 60.15mm-0.25mm, so that the tightening assembly can provide uniform radial bracing force when being tightened by the tightening assembly. Preferably, the tightening sleeve 6 can be made of a polyethylene four-web material, so that the inner hole of the thin-wall workpiece 7 can be well prevented from being scratched, and meanwhile, the installation and the disassembly are convenient.
In order to ensure the radial positioning precision of the supporting force pressing sheet 2 in the supporting component, the positioning pull rod comprises a main positioning pull rod 11 and an auxiliary positioning pull rod 5, the main positioning pull rod 11 is arranged along the axis of the thin-wall workpiece 7, and the diameter of the main positioning pull rod 11 can be adjusted according to the change of the inner hole size of the thin-wall workpiece 7 with different specifications so as to meet the use requirements of the thin-wall workpieces with different sizes. The quantity of assisting location pull rod 5 is provided with 3, and circumference evenly sets up in the outside of main location pull rod 11, and the diameter of assisting location pull rod 5 is less than the diameter of main location pull rod 11, and main location pull rod 11 all connects centre gripping base member 1 with the lower extreme of assisting location pull rod 5, and the upper end all connects the pressure components. Specifically be main positioning pull rod 11 and assist positioning pull rod 5's lower extreme all be equipped with the external screw thread, set up respectively on the centre gripping base member 1 with main positioning pull rod 11 and assist positioning pull rod 5 assorted first screw hole, the quantity of first screw hole is provided with 4 promptly, 1 diameter wherein is great is used for connecting main positioning pull rod 11, three diameter is less relatively in addition and is used for connecting 3 and assists positioning pull rod 5, main positioning pull rod 11 and assist positioning pull rod 5 all with 1 threaded connection of centre gripping base member promptly, this structure not only realizes the installation between positioning pull rod and the centre gripping base member, it is convenient to dismantle, and the positioning pull rod stretches into the length adjustment in the first screw hole of centre gripping base member, have the advantage that the adjustability is good.
The pressing component comprises a positioning pressing plate 8, a pressing nut 9 and a pressing screw 10, and the positioning pressing plate 8 is arranged at the top of the thin-wall workpiece 7 and used for achieving axial positioning of the thin-wall workpiece 7. An external thread is arranged outside the compression nut 9, a second threaded hole matched with the compression nut 9 is formed in the positioning pressing plate 8, and the compression nut 9 is in threaded connection with the positioning pressing plate 8; the top of the main positioning pull rod 11 is provided with a third threaded hole, the compression nut 9 is provided with a fourth threaded hole, the third threaded hole and the fourth threaded hole are both matched with the compression screw 10, namely, the upper part of the compression screw 10 is in threaded connection with the compression nut 9, and the lower part of the compression screw 10 penetrates through the compression nut 9 and is in threaded connection with the main positioning pull rod 11. The structural design realizes that when the compression screw 10 is rotated to move downwards along the axial direction, the compression screw 10 is further in threaded connection with the main positioning pull rod 11, the compression nut 9 is compressed, and further axial pressure is generated on the tightening component, and the tightening component is expanded under the pressure to clamp the thin-wall workpiece 7, so that not only is deformation control of the upper and lower ports of the thin-wall workpiece realized, but also self-excited vibration in the process of cutting the thin-wall workpiece is effectively reduced; and the compression nut 9 is in threaded fit with the positioning pressing plate 8, and when the compression nut 9 is compressed, the positioning pressing plate 8 can be further compressed downwards to provide axial pressure for the thin-wall workpiece, so that axial auxiliary positioning and clamping of the thin-wall workpiece are realized.
During specific use, firstly, a universal fixture is utilized to clamp a clamping base body by a three-jaw self-centering chuck, then a main positioning pull rod and 3 auxiliary positioning pull rods are assembled on the clamping base body in a threaded connection mode respectively, a tensioning assembly is assembled on the main positioning pull rod and the auxiliary positioning pull rods, a thin-wall workpiece is installed on a tensioning sleeve in a clearance fit mode, a positioning pressing plate is installed at the top of the thin-wall workpiece and is in threaded fit with a compression nut, and a compression screw is in threaded fit with the main positioning pull rod and the positioning nut respectively. The tightening component is compressed through the compression nut and the compression screw, so that uniform radial supporting force is provided; and the positioning pressing plate and the compression nut are locked by threads, so that the axial positioning and compression of the thin-wall workpiece are realized. The invention is used for clamping thin-wall workpieces with small aperture, and is particularly well applied to clamping of a vertical four-axis machining center and clamping of a horizontal machining center. The invention can be designed into a group fixture according to the product type of the thin-wall workpiece, so that the thin-wall workpieces with different sizes can be conveniently used, the processing quality of the product is ensured, and the production efficiency is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. The utility model provides a precision thin wall spare internal stay clamping anchor clamps, includes thin wall work piece (7), its characterized in that: the bottom of thin-walled workpiece (7) is provided with centre gripping base member (1), the top is provided with compresses tightly the subassembly, and the inside axial of thin-walled workpiece (7) is provided with the location pull rod, and the both ends of location pull rod respectively with centre gripping base member (1) and compress tightly subassembly fixed connection, and the cover is equipped with on the location pull rod and props tight subassembly.
2. The precision thin-walled part internal bracing clamping fixture according to claim 1, characterized in that: the tightening assembly comprises a tightening pressure pressing sheet (2), an auxiliary gasket (3) and a clamp spring (4), the tightening pressure pressing sheet (2) and the auxiliary gasket (3) are arranged at intervals along the radial direction of the thin-wall workpiece (7), through holes matched with the positioning pull rod are formed in the tightening pressure pressing sheet (2) and the auxiliary gasket (3), and the tightening pressure pressing sheet (2) and the auxiliary gasket (3) are sleeved on the positioning pull rod through the through holes; the clamp spring (4) is sleeved outside the supporting force pressing sheet (2) and the auxiliary gasket (3).
3. The precision thin-walled part internal bracing clamping fixture according to claim 2, characterized in that: the outside cover of jump ring (4) is equipped with and props tight cover (6), and props tight cover (6) and thin wall work piece (7) clearance fit.
4. The precision thin-walled part internal bracing clamping fixture according to claim 1 or 3, characterized in that: the positioning pull rod comprises a main positioning pull rod (11) and an auxiliary positioning pull rod (5), the main positioning pull rod (11) is arranged along the axis of the thin-wall workpiece (7), the auxiliary positioning pull rod (5) is located on the outer side of the main positioning pull rod (11), and the lower ends of the main positioning pull rod (11) and the auxiliary positioning pull rod (5) are connected with a clamping base body (1) and the upper end of the main positioning pull rod is connected with a pressing component.
5. The precision thin-walled part internal bracing clamping fixture according to claim 4, characterized in that: the number of the auxiliary positioning pull rods (5) is 3, the auxiliary positioning pull rods are circumferentially and uniformly arranged on the outer side of the main positioning pull rod (11), and the diameter of each auxiliary positioning pull rod (5) is smaller than that of each main positioning pull rod (11).
6. The precision thin-walled part internal bracing clamping fixture according to claim 5, characterized in that: the lower extreme of main location pull rod (11) and assistance location pull rod (5) all is equipped with the external screw thread, set up respectively on centre gripping base member (1) with main location pull rod (11) and assistance location pull rod (5) assorted first screw hole, main location pull rod (11) and assistance location pull rod (5) all with centre gripping base member (1) threaded connection.
7. The precision thin-walled part internal bracing clamping fixture according to claim 6, characterized in that: the pressing component comprises a positioning pressing plate (8), a pressing nut (9) and a pressing screw (10), the positioning pressing plate (8) is arranged at the top of the thin-wall workpiece (7), external threads are arranged outside the pressing nut (9), a second threaded hole matched with the pressing nut (9) is formed in the positioning pressing plate (8), and the pressing nut (9) is in threaded connection with the positioning pressing plate (8); the top of main location pull rod (11) is equipped with the third screw hole, is equipped with the fourth screw hole on gland nut (9), and third screw hole and fourth screw hole all match with housing screw (10), and the upper portion and gland nut (9) threaded connection of gland screw (10), the lower part of gland screw (10) pass gland nut (9) and with main location pull rod (11) threaded connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011351041.7A CN112705966A (en) | 2020-11-25 | 2020-11-25 | Internal supporting and clamping fixture for precise thin-walled piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011351041.7A CN112705966A (en) | 2020-11-25 | 2020-11-25 | Internal supporting and clamping fixture for precise thin-walled piece |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112705966A true CN112705966A (en) | 2021-04-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011351041.7A Pending CN112705966A (en) | 2020-11-25 | 2020-11-25 | Internal supporting and clamping fixture for precise thin-walled piece |
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| Country | Link |
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| CN (1) | CN112705966A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114087264A (en) * | 2021-11-16 | 2022-02-25 | 鲁东大学 | Engineering machinery vehicle thin-walled tube package assembly |
| CN114350909A (en) * | 2022-01-10 | 2022-04-15 | 亚太轻合金(南通)科技有限公司 | Clamping device for quenching large-size thin-wall workpiece and quenching method |
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| CN111230164A (en) * | 2020-02-03 | 2020-06-05 | 大连理工大学 | Automatic internal supporting clamp for thin-wall cylindrical part and clamping method |
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| JP2003260624A (en) * | 2002-03-05 | 2003-09-16 | Kosmek Ltd | Positioning device |
| US20050252001A1 (en) * | 2004-05-13 | 2005-11-17 | Rolls-Royce Plc | Method of manufacturing thin wall isogrid casings |
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| CN114087264A (en) * | 2021-11-16 | 2022-02-25 | 鲁东大学 | Engineering machinery vehicle thin-walled tube package assembly |
| CN114350909A (en) * | 2022-01-10 | 2022-04-15 | 亚太轻合金(南通)科技有限公司 | Clamping device for quenching large-size thin-wall workpiece and quenching method |
| CN114350909B (en) * | 2022-01-10 | 2024-02-20 | 亚太轻合金(南通)科技有限公司 | Clamping device for quenching large-size thin-wall workpiece and quenching method |
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Application publication date: 20210427 |