CN109676411B - Clamping device for thin-wall annular workpiece - Google Patents

Abstract

The invention discloses a clamping device for a thin-wall annular workpiece, which comprises: the chassis base comprises a plurality of first circular truncated cones which are sequentially and coaxially stacked, and the diameters of the first circular truncated cones which are sequentially stacked gradually decrease; the cover plate comprises a plurality of second round tables which are sequentially and coaxially stacked, the diameters of the second round tables which are sequentially stacked are gradually reduced, the diameter of at least one second round table in the second round tables is the same as that of any first round table, and the cover plate and the chassis base are coaxially arranged at intervals; and the fastening connecting piece is used for connecting the chassis base and the cover plate. The invention can be suitable for annular workpieces with various diameters, does not need to design and manufacture a plurality of sets of axial clamping fixtures, and is convenient to use.

Description

Clamping device for thin-walled annular workpieces

technical field

The invention relates to the technical field of machining, in particular to a clamping device for thin-walled annular workpieces.

Background technique

Thin-walled annular workpieces are widely used because of their light weight, material saving and compact structure. However, the thin-walled annular workpiece has poor rigidity and weak strength. In order to prevent the annular workpiece from being radially deformed when the expansion-tightening fixture is used to clamp the annular workpiece. At present, an axial clamping fixture is usually used. The axial clamping fixture includes two cover plates. The cover plate is provided with a limit groove that cooperates with the annular workpiece. One cover plate is press-fitted on one end of the annular workpiece through the limit groove, and the other A cover plate is also press-fitted on the other end of the annular workpiece through a limiting groove, and a connecting piece is used to connect the two cover plates.

However, the existing axial clamping jig can only be adapted to a ring workpiece of one size, and another set of axial clamping jig needs to be designed and manufactured to clamp a larger or smaller size ring workpiece, so it is not necessary to Easy to use.

SUMMARY OF THE INVENTION

The embodiment of the present invention provides a clamping device for a thin-walled annular workpiece, which can be applied to a variety of annular workpieces with different diameters, without the need to design and manufacture multiple sets of axial clamping fixtures, which is convenient for use. The technical solution is as follows:

On the one hand, an embodiment of the present invention provides a clamping device for a thin-walled annular workpiece, the clamping device includes: a chassis base, including a plurality of first circular troughs stacked coaxially in sequence, a plurality of The diameter of the first circular truncated gradually becomes smaller; the cover plate includes a plurality of second truncated troughs stacked coaxially in sequence, and the diameters of the plurality of successively stacked second truncated truncated truncated gradually become smaller, and there are The diameter of at least one of the second circular truncated cones is the same as the diameter of any one of the first circular truncated cones, the cover plate and the chassis base are coaxially spaced apart; a fastening connector is used to connect the chassis base and the cover plate.

In an implementation manner of the embodiment of the present invention, the clamping device further includes a diameter expansion ring, and the inner diameter of the diameter expansion ring is the same as the outer diameter of one of the plurality of first circular truncated cones , the expanding ring is sleeved on the first circular platform.

In another implementation manner of the embodiment of the present invention, the diameter expansion ring includes a first backing ring, a second backing ring and an elastic element, the first backing ring is coaxially sleeved on the second backing ring, A plurality of the elastic elements distributed in the circumferential direction are arranged between the first backing ring and the second backing ring, one end of the elastic element is connected with the inner wall of the first backing ring, and the elastic element is The other end is connected with the outer wall of the second backing ring.

In another implementation manner of the embodiment of the present invention, the fastening connector includes a connecting rod with threads provided at both ends, and the two ends of the connecting rod are respectively connected with the chassis base and the cover plate with threads.

In another implementation manner of the embodiment of the present invention, the connecting rod includes a first connecting rod with threads at both ends, a second connecting rod with threads at both ends, and a connecting rod sleeve, and one end of the first connecting rod connected with the chassis base, one end of the second connecting rod is connected with the cover plate, and two ends of the connecting rod sleeve are respectively connected with the other end of the first connecting rod and the other end of the second connecting rod One end is threadedly connected, and the threads of the other end of the first connecting rod and the other end of the second connecting rod are rotated in opposite directions.

In another implementation manner of the embodiment of the present invention, the fastening connector further includes a first nut and a second nut, the first nut is threadedly connected to one end of the connecting rod, and the first nut is located at the end of the connecting rod. The end face of the first circular cone facing the cover plate, the second nut is threadedly connected with the other end of the connecting rod, and the second nut is located on the end face of the second circular cone facing away from the chassis base .

In another implementation manner of the embodiment of the present invention, the length of the connecting rod is 400 mm to 500 mm.

In another implementation manner of the embodiment of the present invention, a chamfer is provided at the intersection of the outer edge of the first circular cone and the end face of the first circular cone.

In another implementation manner of the embodiment of the present invention, rubber pads are provided on the peripheral edges of the first circular truncated and the second circular truncated, and the rubber pads are located between the chassis base and the cover plate.

In another implementation manner of the embodiment of the present invention, diameters of some of the first circular truncated truncated cones are 238 mm, 220 mm, and 210 mm.

The beneficial effects brought by the technical solutions provided in the embodiments of the present invention are:

In the embodiment of the present invention, the chassis base includes a plurality of coaxially stacked first circular platforms, and the cover plate also includes a plurality of coaxially stacked second circular platforms, and the diameters of the multiple first circular platforms and the multiple second circular platforms are gradually reduced, That is, the chassis seat and the cover plate are both stepped, and the diameter of at least one second circular platform in the plurality of second circular platforms is the same as the diameter of any first circular platform, so that the chassis seat and the cover plate can be guaranteed when clamping the annular workpiece. Radial support can be applied to both ends of the annular workpiece at the same time. At the same time, in the embodiment of the present invention, the diameters of the plurality of first circular tables and the plurality of second circular tables are gradually reduced, so that the clamping device can be applied to a variety of annular workpieces with different diameters. It is not necessary to design and manufacture multiple sets of axial clamping fixtures, which is convenient for use. After applying radial support force on both ends of the annular workpiece through the chassis seat and the cover plate, the chassis seat and the cover plate are connected by fastening connectors. , applying a locking force in the axial direction can prevent the annular workpiece from being deformed by excessive clamping force in the radial direction.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a schematic structural diagram of a clamping device for a thin-walled annular workpiece provided by an embodiment of the present invention;

2 is a schematic view of a clamping device for a thin-walled annular workpiece provided by an embodiment of the present invention with a diameter expansion ring installed;

3 is a schematic structural diagram of a diameter expansion ring provided by an embodiment of the present invention;

4 is a schematic structural diagram of a connecting rod provided by an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a chassis base provided by an embodiment of the present invention.

The meanings of the symbols in the figure are as follows:

1- Chassis seat, 11- First round table, 2- Cover plate, 21- Second round table, 3- Fastening connecting piece, 31- First connecting rod, 32- Second connecting rod, 33- Connecting rod sleeve, 34 - First nut, 35 - Second nut, 4 - Expanding ring, 41 - First gasket, 42 - Second gasket, 43 - Elastic element, 5 - Ring workpiece, 6 - Four-jaw chuck.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

FIG. 1 is a schematic structural diagram of a clamping device for a thin-walled annular workpiece according to an embodiment of the present invention. As shown in FIG. 1 , the clamping device includes: a chassis base 1 , a cover plate 2 and a fastening connector 3 . The chassis base 1 includes a plurality of first circular platforms 11 stacked coaxially in sequence, and the diameters of the plurality of sequentially stacked first circular platforms 11 gradually decrease. The cover plate 2 includes a plurality of second circular platforms 21 that are coaxially stacked in sequence, the diameters of the plurality of sequentially stacked second circular platforms 21 are gradually reduced, and the diameter of at least one second circular platform 21 is different from any one of the plurality of second circular platforms 21 . The diameter of the first circular platform 11 is the same, and the cover plate 2 and the chassis base 1 are arranged coaxially and spaced apart. Fasten the connector 3 for connecting the chassis base 1 and the cover plate 2 .

In the embodiment of the present invention, the chassis base includes a plurality of coaxially stacked first circular platforms, and the cover plate also includes a plurality of coaxially stacked second circular platforms, and the diameters of the multiple first circular platforms and the multiple second circular platforms are gradually reduced, That is, the chassis seat and the cover plate are both stepped, and the diameter of at least one second circular platform in the plurality of second circular platforms is the same as the diameter of any first circular platform, so that the chassis seat and the cover plate can be guaranteed when clamping the annular workpiece. At the same time, radial support can be applied to both ends of the annular workpiece. At the same time, in the embodiment of the present invention, the diameters of the plurality of first circular tables and the plurality of second circular tables are gradually reduced, so that the clamping device can be applied to a variety of different diameters. If you want to clamp larger or smaller ring workpieces, you do not need to design and make multiple sets of axial clamping fixtures, which is easy to use, and radial supports are applied at both ends of the annular workpiece through the chassis seat and the cover plate. After the force is applied, the chassis seat and the cover plate are connected by the fastening connector, and the locking force is applied in the axial direction, which can prevent the annular workpiece from being deformed due to excessive clamping force in the radial direction.

FIG. 2 is a schematic diagram of a clamping device for a thin-walled annular workpiece provided in an embodiment of the present invention with a diameter expansion ring installed. As shown in FIG. 2 , the clamping device further includes a diameter expansion ring 4, the inner diameter of the diameter expansion ring 4 is the same as the outer diameter of a first circular platform 11 among the plurality of first circular platforms 11, and the diameter expansion ring 4 is sleeved on the first circular platform 11 on. In this embodiment, the expanding ring 4 is coaxially sleeved on the first circular truncated 11 with the second largest diameter, and the inner diameter of the expanding ring 4 is the same as the outer diameter of the first circular truncated 11 , wherein the first circular truncated with the largest diameter 11 is used for installation with the four-jaw chuck 6 of the lathe, and the remaining first circular table 11 is used for clamping with the annular workpiece. Disposing the expansion ring 4 on the first circular table 11 can improve the clamping device to support annular workpieces with a larger size range, so there is no need to design and manufacture multiple sets of clamping devices, which saves costs and is easy to use.

FIG. 3 is a schematic structural diagram of a diameter expansion ring provided by an embodiment of the present invention. As shown in FIG. 3 , the diameter expanding ring 4 includes a first backing ring 41 , a second backing ring 42 and an elastic element 43 . The first backing ring 41 is coaxially sleeved on the second backing ring 42 . A plurality of circumferentially distributed elastic elements 43 are arranged between the two backing rings 42 . After the elastic element 43 (such as a spring) is arranged in the diameter expansion ring 4, the radial distance between the first backing ring 41 and the second backing ring 42 can be changed, that is, the distance between the first backing ring 41 and the second backing ring 42 can be changed. The adjustment distance of can be the elastic deformation range of the elastic element 43 . In this way, by adjusting the distance between the first backing ring 41 and the second backing ring 42, the wall thickness of the diameter-expanding ring 4 is changed, so that the diameter-expanding ring 4 can be adapted to more annular workpieces of different sizes, and the clamping device can be increased in size. applicability.

FIG. 4 is a schematic structural diagram of a connecting rod provided by an embodiment of the present invention. As shown in FIG. 4 , the fastening connector 3 includes a connecting rod with threads at both ends, and the two ends of the connecting rod are respectively connected with the chassis base 1 and the cover plate 2 by screws. The two ends of the fastening connector 3 use threads to connect and fix the chassis base 1 and the cover plate 2 respectively. The base plate and the cover plate 2 are locked by the screw pair, which can prevent the chassis base 1 and the cover plate 2 from sliding off the connecting rod, which is convenient for use. .

Optionally, the connecting rod includes a first connecting rod 31 with threads at both ends, a second connecting rod 32 with threads at both ends, and a connecting rod sleeve 33. One end of the first connecting rod 31 is connected to the chassis base 1, and the second connecting rod 31 is connected to the chassis base 1. One end of the rod 32 is connected with the cover plate 2, and the two ends of the connecting rod sleeve 33 are respectively connected with the other end of the first connecting rod 31 and the other end of the second connecting rod 32 by screw thread. The threads on the other end of the connecting rod 32 are rotated in opposite directions. In this embodiment, the first connecting rod 31 is used for threaded connection with the chassis base 1, the second connecting rod 32 is used for threaded connection with the cover plate 2, and the thread at the other end of the first connecting rod 31 is a left-handed thread, and the second connecting rod 32 is used for threaded connection with the cover plate 2. The thread at the other end of the connecting rod 32 is a right-handed thread, and the two ends of the connecting rod sleeve 33 are respectively connected with the other end of the first connecting rod 31 and the other end of the second connecting rod 32, so that when the connecting rod sleeve is screwed 33 , the first connecting rod 31 and the second connecting rod 32 will move away from each other or approach each other, so as to adjust the axial length of the connecting rod, so as to realize the purpose of clamping annular workpieces with different axial lengths. Wherein, the length of the connecting rod is 400mm to 500mm. Both the first connecting rod 31 and the second connecting rod 32 can be 230 mm, and the length of the connecting rod sleeve 33 is not less than 40 mm, so that the total length of the first connecting rod, the second connecting rod 32 and the connecting rod sleeve 33 can reach 500 mm, so that the length of the connecting rod sleeve 33 can reach 500 mm. Clamping ring workpieces of different axial lengths.

Optionally, the fastening connector 3 further includes a first nut 34 and a second nut 35, the first nut 34 is threadedly connected to one end of the connecting rod, and the first nut 34 is located on the end face of the first circular table 11 facing the cover plate 2, The second nut 35 is threadedly connected with the other end of the connecting rod, and the second nut 35 is located on the end surface of the second round table 21 facing away from the chassis base 1 . By setting the first nut 34 and the second nut 35 to lock the cover plate 2 and the chassis base 1, the cover plate 2 and the chassis base 1 can be prevented from being separated from the connecting rod, and the axial direction can be applied to the cover plate 2 by adjusting the second nut 35 Therefore, the clamping device is more reliable when clamping the ring workpiece.

Optionally, a chamfer is provided at the intersection of the outer edge of the first circular table 11 and the end face of the first circular table 11 . In order to ensure the clamping effect, the inner diameter of the annular workpiece needs to be consistent with the outer diameter of the first circular table 11 and the second circular table 21. Therefore, in order to prevent the ring workpiece from colliding with the first circular table 11 or the second circular table 21 when it is set, causing damage, In the embodiment of the present invention, a chamfer is provided at the intersection of the outer edge of the first round table 11 and the end face of the first round table 11 , so that the annular workpiece can be smoothly sleeved on the first round table 11 or the second round table 21 during installation.

Optionally, rubber pads are provided on the peripheral edges of the first circular platform 11 and the second circular platform 21 , and the rubber pads are located between the chassis base 1 and the cover plate 2 . A rubber pad is provided to prevent the clamping device from exerting an excessive axial force on the annular workpiece to cause damage to the annular workpiece, and a part of the axial force is buffered by the rubber pad to protect the annular workpiece.

As shown in FIG. 5 , some of the first circular truncated truncated truncated cones have diameters of 238 mm, 220 mm and 210 mm. The largest diameter of the first round table is 310mm, and the first round table is used for cooperating with the four-jaw chuck of the lathe. And the position of the center line of the chassis seat is provided with a threaded hole for threaded connection with the connecting rod. The diameter of the threaded hole is 20mm and the depth is 37mm. The end face of each first circular table is used for abutting against the end face of the annular workpiece, so as to abut the annular workpiece in the radial direction. Both ends of the connecting rod have M20 threads, and the middle is a metal rod, and the length can be 400mm.

In this embodiment, the difference between the cover plate and the chassis seat is that the interior is hollow, which can reduce the mass of the cover plate, reduce the radial force borne by the connecting rod, and facilitate use.

When clamping the annular workpiece by the clamping device provided in the embodiment of the present invention, firstly, the first circular platform with the largest diameter is clamped with a four-jaw chuck, so that the connecting rod passes through the inside of the annular workpiece, and one end of the connecting rod is connected to the base. Connected and fixed by the first nut, at the same time, one end face of the annular workpiece is abutted against the end face of a first circular table, and then the other end face of the annular workpiece is abutted against the end face of the cover plate, and a gasket is added to the cover plate. Clamp with the second nut. By tightening the second nut, the cover plate exerts an axial force on the annular workpiece, and the first and second circular platforms in the chassis base and the cover plate, which are directly against the annular workpiece, generate radial force on the annular workpiece to support the annular workpiece. And bear the gravity of the annular workpiece.

With the clamping device provided in this embodiment, after the annular workpiece is clamped, the annular workpiece does not deform radially. This is mainly because the annular workpiece bears a large axial clamping force in the axial direction, so that the annular workpiece is not deformed in the radial direction. No radial deformation occurs.

In this embodiment, transition fit can be adopted when the connecting rod is matched with the threaded hole on the chassis base, which is convenient for disassembly. The threaded holes on the chassis base can be through holes, and the depth of the connecting rod screwed into the chassis base can be adjusted according to the length of the annular workpiece, so that the clamping of annular workpieces of different lengths can be adapted.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. Inside.

Claims (8)

1. A clamping device for a thin-walled annular workpiece, wherein the clamping device comprises: A chassis base (1), comprising a plurality of first circular platforms (11) stacked coaxially in sequence, and the diameters of the plurality of sequentially stacked first circular platforms (11) gradually become smaller; A cover plate (2), comprising a plurality of second circular truncated truncated (21) stacked coaxially in sequence, the diameters of the plurality of successively stacked second circular truncated truncated truncated (21) being gradually smaller, and the plurality of second circular truncated truncated truncated (21) There is at least one second circular truncated truncated (21) having the same diameter as any one of the first circular truncated truncated tables (11), and the cover plate (2) and the chassis base (1) are coaxially spaced apart; a fastening connector (3) for connecting the chassis base (1) and the cover plate (2), The clamping device further comprises a diameter expansion ring (4), and the inner diameter of the diameter expansion ring (4) is the same as the outer diameter of one of the first circular truncated cones (11) in the plurality of first circular truncated cones (11). , the diameter expansion ring (4) is sleeved on the first circular platform (11), and the diameter expansion ring (4) includes a first backing ring (41), a second backing ring (42) and an elastic element (43) ), the first backing ring (41) is coaxially sleeved on the second backing ring (42), and multiple backing rings (41) and the second backing ring (42) are arranged between The elastic elements (43) are distributed in the circumferential direction, one end of the elastic element (43) is connected with the inner wall of the first backing ring (41), and the other end of the elastic element (43) is connected with the first backing ring (41). The outer walls of the two backing rings (42) are connected. 2. The clamping device according to claim 1, characterized in that, the fastening connector (3) comprises a connecting rod with threads provided at both ends, and the two ends of the connecting rod are respectively connected with the chassis base (3). 1) is screwed to the cover plate (2). 3. The clamping device according to claim 2, wherein the connecting rod comprises a first connecting rod (31) with threads at both ends, a second connecting rod (32) with threads at both ends, and a connecting rod A sleeve (33), one end of the first connecting rod (31) is connected to the chassis base (1), one end of the second connecting rod (32) is connected to the cover plate (2), and the connecting rod (32) is connected to the cover plate (2). Two ends of the rod sleeve (33) are respectively screwed with the other end of the first connecting rod (31) and the other end of the second connecting rod (32), and the other end of the first connecting rod (31) The thread rotation direction of the other end of the second connecting rod (32) is opposite. 4. The clamping device according to claim 2, characterized in that, the fastening connector (3) further comprises a first nut (34) and a second nut (35), the first nut (34) It is threadedly connected with one end of the connecting rod, the first nut (34) is located on the end surface of the first round table (11) facing the cover plate (2), and the second nut (35) is connected to the The other end of the connecting rod is threadedly connected, and the second nut (35) is located on the end surface of the second round table (21) facing away from the chassis base (1). 5. The clamping device according to claim 2, wherein the length of the connecting rod is 400mm to 500mm. 6. The clamping device according to any one of claims 1 to 5, wherein a chamfer is provided at the intersection of the outer edge of the first circular table (11) and the end face of the first circular table (11) . 7. The clamping device according to any one of claims 1 to 5, characterized in that, rubber pads are provided on the peripheral edges of the first circular platform (11) and the second circular platform (21), and the A rubber pad is located between the chassis base (1) and the cover plate (2). 8. The clamping device according to any one of claims 1 to 5, characterized in that, among the plurality of first circular platforms (11), there are part of the first circular platforms (11) with diameters of 238mm, 220mm and 210mm.

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