Large-size cylindrical workpiece clamping fixture

Abstract

The large-size cylindrical workpiece clamping fixture comprises a base, a supporting cylinder and an inner supporting device, a first positioning table and a second positioning table are arranged on the surface of the base, the first positioning table is sleeved with the lower end of a cylindrical workpiece, the lower end of the supporting cylinder is sleeved with the second positioning table, a boss is further arranged on the outer surface of the supporting cylinder, and the boss is sleeved with the inner supporting device. The inner supporting device comprises a shaft sleeve and a supporting rod, the shaft sleeve is installed on the boss through a rolling bearing, the supporting rod is in threaded connection with the shaft sleeve, and at least one end of the supporting rod abuts against the inner surface of the cylindrical workpiece. By the adoption of the technical scheme, when the cylindrical workpiece is clamped, operation torque is applied to the shaft sleeve, the supporting rod moves in the axial direction of the shaft sleeve, and the tail end of the supporting rod can abut against the inner surface of the cylindrical workpiece, so that the upper end of the cylindrical workpiece is supported to be round, and when corresponding shape elements are cut and machined on the surface of the workpiece, the supporting rod is not damaged. The inner supporting device counteracts part of cutting force, so that deformation of the cylindrical workpiece is reduced, and the cutting machining precision of the workpiece is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of cutting processing fixtures, in particular to a large-size cylindrical workpiece clamping fixture. Background Art

[0002] Thin-walled cylindrical workpieces are widely used components in various mechanical equipment or devices. When cutting the contours of such workpieces, in order to prevent the workpieces from deformation during the processing, multiple clamping devices are usually used to clamp and clamp the workpieces.

[0003] For example, the patent document with publication number: "CN220659986U" discloses a thin-walled annular workpiece cutting processing fixture, including a base and multiple internal support devices, the internal support device including a main support block, a support rod, a support rod and a pressure plate, the lower end of the support rod and the lower end of the support rod are screwed to the base, the upper end of the support rod is screwed to the locking nut, the base is also fixedly connected to the main support block, and the surface of the main support block is provided with a main positioning platform, the surface of the pressure plate is provided with a limiting hole, the surface of the thin-walled annular workpiece is provided with a boss, the support rod is also inserted into the limiting hole, and the upper end of the support rod is abutted against one end of the pressure plate, and the boss is clamped between the other end of the pressure plate and the main positioning platform.

[0004] This patented technical solution uses multiple pressure plates to clamp the workpiece, and the multiple pressure plates are arranged at equal intervals along the central axis of the workpiece. However, for large-sized cylindrical workpieces, the pressure plates can often only generate a clamping force on the lower end surface of the workpiece, so that the lower end of the workpiece is clamped firmly. Due to the large external dimensions of the cylindrical workpiece, when the shape elements are cut on the surface of the workpiece, the cylindrical workpiece is prone to the risk of tipping over, and since there is no corresponding force point at the upper end of the workpiece, the upper end of the workpiece is very likely to be deformed, affecting the cutting accuracy of the workpiece. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a large-size cylindrical workpiece clamping fixture.

[0006] The utility model is achieved through the following technical solutions.

[0007] The utility model provides a large-size cylindrical workpiece clamping fixture, including a base, a supporting cylinder and an internal support device, the surface of the base is provided with a first positioning platform and a second positioning platform, the first positioning platform is engaged with the lower end of the cylindrical workpiece, the upper end of the cylindrical workpiece extends upward along the vertical direction, the lower end of the supporting cylinder is engaged with the second positioning platform, the upper end of the supporting cylinder extends upward along the vertical direction, the outer surface of the supporting cylinder is further provided with a boss, the internal support device includes a sleeve and a support rod, the sleeve is mounted on the boss using a rolling bearing, the support rod is screwed to the sleeve, and at least one end of the support rod rests on the inner surface of the cylindrical workpiece.

[0008] There are multiple inner supporting devices, and any two adjacent inner supporting devices are staggered with each other along the axial direction of the supporting cylinder and the tangential direction of the outer circumferential surface of the supporting cylinder.

[0009] The inner support device further comprises a locking bolt which is threadedly connected to the shaft sleeve, and the end of the locking bolt can abut against the surface of the support rod.

[0010] The number of the internal supporting devices is more than 8, and all the internal supporting devices are arranged in at least two groups along the axial direction of the supporting cylinder.

[0011] The end surface of at least one end of the support rod is in an arc shape or a spherical shape.

[0012] The large-size cylindrical workpiece clamping fixture also includes a clamping device, which includes a pressure block, a support rod and a clamping nut. A limiting hole is provided on the surface of the pressure block, and the support rod passes through the limiting hole. One end of the support rod is screwed to the base, and the other end of the support rod is screwed to the clamping nut, and one end of the pressure block is placed against the surface of the base, and at least a part of the cylindrical workpiece is clamped between the other end of the pressure block and the surface of the base.

[0013] The pressing device further comprises a washer, the support rod further passes through the washer, and the washer is clamped between the pressing block and the pressing nut.

[0014] The limiting hole is a waist-shaped through hole.

[0015] The base is in the shape of a disk as a whole, and there are multiple pressing devices, which are arranged at equal intervals around the central axis of the base.

[0016] The number of the pressing devices is more than 4.

[0017] The beneficial effect of the present invention is that: when the cylindrical workpiece is clamped, the technical solution of the present invention is adopted, and an operating torque is applied to the shaft sleeve so that the support rod moves along the axial direction of the shaft sleeve, so that the end of the support rod can be against the inner surface of the cylindrical workpiece, thereby supporting the upper end of the cylindrical workpiece to be rounded. When the corresponding shape elements are cut on the workpiece surface, the internal support device offsets part of the cutting force, thereby reducing the deformation of the cylindrical workpiece and improving the cutting accuracy of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the main view of the utility model;

[0019] Figure 2 It is a top view of the utility model;

[0020] Figure 3 This utility model Figure 1 A partial enlarged view of point Ⅰ in the middle;

[0021] Figure 4 This utility model Figure 1 A partial enlarged view of point II in the middle.

[0022] In the figure: 1-base, 2-support cylinder, 3-inner support device, 4-first positioning platform, 5-second positioning platform, 6-cylindrical workpiece, 7-boss, 8-sleeve, 9-support rod, 10-locking bolt, 11-clamping device, 12-pressure block, 13-support rod, 14-clamping nut, 15-limiting hole, 16-washer. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the described solution.

[0024] like Figures 1 to 4 As shown, the utility model provides a large-size cylindrical workpiece clamping fixture, including a base 1, a supporting cylinder 2 and an internal support device 3. The surface of the base 1 is provided with a first positioning platform 4 and a second positioning platform 5. The first positioning platform 4 is fitted with the lower end of the cylindrical workpiece 6, and the upper end of the cylindrical workpiece 6 extends upward in a vertical direction. The lower end of the supporting cylinder 2 is fitted with the second positioning platform 5, and the upper end of the supporting cylinder 2 extends upward in a vertical direction. The outer surface of the supporting cylinder 2 is also provided with a boss 7. The internal support device 3 includes a sleeve 8 and a support rod 9. The sleeve 8 is mounted on the boss 7 using a rolling bearing. The support rod 9 is screwed to the sleeve 8, and at least one end of the support rod 9 rests on the inner surface of the cylindrical workpiece 6.

[0025] By adopting the technical solution of the present invention, when clamping a cylindrical workpiece, an operating torque is applied to the sleeve to make the support rod move along the axial direction of the sleeve, so that the end of the support rod can abut against the inner surface of the cylindrical workpiece, thereby supporting the upper end of the cylindrical workpiece into a circle. When the corresponding shape elements are cut on the workpiece surface, the internal support device offsets part of the cutting force, thereby reducing the deformation of the cylindrical workpiece and improving the cutting accuracy of the workpiece.

[0026] Specifically, there are multiple internal support devices 3, with any two adjacent internal support devices 3 staggered along the axial direction of the support cylinder 2 and along the tangential direction of the outer circumference of the support cylinder 2. The internal support devices 3 also include locking bolts 10, which are threadedly connected to the sleeve 8, and the ends of the locking bolts 10 are capable of abutting against the surface of the support rod 9. The number of internal support devices 3 is eight or more, and all internal support devices 3 are arranged in at least two groups along the axial direction of the support cylinder 2. This ensures uniform force on the inner surface of the cylindrical workpiece, which helps improve workpiece cutting accuracy.

[0027] In addition, at least one end of the support rod 9 has an arc-shaped or spherical end surface. The surface of the support rod 9 is also provided with multiple scale lines, with 1mm spacing between adjacent scale lines. When using the present invention to clamp a workpiece, the operator can easily adjust the extension length of the support rod 9 relative to the outer surface of the support cylinder 2 to round the inner surface of the cylindrical workpiece.

[0028] In addition, the large-size cylindrical workpiece clamping fixture also includes a clamping device 11, which includes a pressure block 12, a support rod 13 and a clamping nut 14. A limiting hole 15 is provided on the surface of the pressure block 12, and the support rod 13 passes through the limiting hole 15. One end of the support rod 13 is screwed to the base 1, and the other end of the support rod 13 is screwed to the clamping nut 14, and one end of the pressure block 12 is abutted against the surface of the base 1, and at least a portion of the cylindrical workpiece 6 is clamped between the other end of the pressure block 12 and the surface of the base 1.

[0029] Specifically, the clamping device 11 also includes a washer 16, through which the support rod 13 extends, and the washer 16 is clamped between the pressure block 12 and the compression nut 14. The limiting hole 15 is preferably a through-hole with a rounded shape. The base 1 is generally disc-shaped, and there are multiple clamping devices 11, which are arranged at equal intervals around the central axis of the base 1. The number of clamping devices 11 is at least four.

Claims

1. A fixture for clamping large cylindrical workpieces, characterized by: The invention comprises a base (1), a supporting cylinder (2) and an inner supporting device (3), wherein the surface of the base (1) is provided with a first positioning platform (4) and a second positioning platform (5), wherein the first positioning platform (4) is fitted with the lower end of the cylindrical workpiece (6), and the upper end of the cylindrical workpiece (6) extends upward in a vertical direction, the lower end of the supporting cylinder (2) is fitted with the second positioning platform (5), and the upper end of the supporting cylinder (2) extends upward in a vertical direction, and the outer surface of the supporting cylinder (2) is further provided with a boss (7), and the inner supporting device (3) comprises a sleeve (8) and a support rod (9), wherein the sleeve (8) is mounted on the boss (7) using a rolling bearing, the support rod (9) is screwed to the sleeve (8), and at least one end of the support rod (9) abuts against the inner surface of the cylindrical workpiece (6).

2. The large-size cylindrical workpiece clamping fixture according to claim 1, characterized in that: There are a plurality of inner support devices (3), and any two adjacent inner support devices (3) are staggered with each other along the axial direction of the support cylinder (2) and the tangential direction of the outer circumferential surface of the support cylinder (2).

3. The large-size cylindrical workpiece clamping fixture according to claim 1, characterized in that: The inner support device (3) further comprises a locking bolt (10), the locking bolt (10) being threadedly connected to the shaft sleeve (8), and the end of the locking bolt (10) being able to abut against the surface of the support rod (9).

4. The large-size cylindrical workpiece clamping fixture according to claim 1 or 2, characterized in that: The number of the internal support devices (3) is more than 8, and all the internal support devices (3) are arranged in at least two groups along the axial direction of the support cylinder (2).

5. The large-size cylindrical workpiece clamping fixture according to claim 1 or 3, characterized in that: The end surface of at least one end of the support rod (9) is in an arc shape or a spherical shape.

6. The large-size cylindrical workpiece clamping fixture according to claim 1, characterized in that: The large-size cylindrical workpiece clamping fixture also includes a clamping device (11), which includes a pressure block (12), a support rod (13) and a clamping nut (14). A limiting hole (15) is provided on the surface of the pressure block (12), and the support rod (13) passes through the limiting hole (15). One end of the support rod (13) is screwed to the base (1), and the other end of the support rod (13) is screwed to the clamping nut (14), and one end of the pressure block (12) is pressed against the surface of the base (1). At least a part of the cylindrical workpiece (6) is clamped between the other end of the pressure block (12) and the surface of the base (1).

7. The large-size cylindrical workpiece clamping fixture according to claim 6, characterized in that: The pressing device (11) further comprises a washer (16), the support rod (13) also passes through the washer (16), and the washer (16) is clamped between the pressing block (12) and the pressing nut (14).

8. The large-size cylindrical workpiece clamping fixture according to claim 6, characterized in that: The limiting hole (15) is a waist-shaped through hole.

9. The large-size cylindrical workpiece clamping fixture according to claim 6, characterized in that: The base (1) is in the shape of a disk as a whole, and the number of the pressing devices (11) is multiple, and the multiple pressing devices (11) are arranged at equal intervals around the central axis of the base (1).

10. The large-size cylindrical workpiece clamping fixture according to claim 9, characterized in that: The number of the pressing devices (11) is more than 4.

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