Positioning fixture for turning annular workpiece

Abstract

The utility model provides an annular workpiece turning positioning clamp which comprises a base with a supporting face, a movable rod and a driving assembly are arranged on the base, a driving head is arranged at one end of the movable rod, an annular groove is formed in the driving head, at least two rotatable abutting blocks are further arranged on the base, and the abutting blocks are arranged at intervals in the axial direction of the movable rod. Rotating shafts of the abutting blocks are parallel to the supporting face and perpendicular to the axial direction of the movable rod, the ends, close to the driving head, of the abutting blocks stretch into the annular groove to abut against the driving head, the ends, away from the driving head, of the abutting blocks are provided with abutting parts, and the distances between any two abutting parts and the axis of the movable rod are equal. When the driving assembly drives the movable rod to ascend and descend, the driving head drives the abutting block to rotate and enables the abutting part to be close to or away from the movable rod. The machining fixture solves the technical problem that an existing machining fixture is inconvenient to use, and has the technical effects that the annular workpiece is positioned while being clamped, and the workpiece clamping operation steps are simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of machining, in particular to a positioning fixture for turning a ring-shaped workpiece. Background Art

[0002] When turning a ring-shaped workpiece, a positioning fixture is required to clamp the ring-shaped workpiece.

[0003] The Chinese utility model patent with the publication number CN214053675U discloses a turning fixture for a thin-walled ring-shaped forging, which includes a frame assembly and a fastening assembly. The number of the fastening assemblies is three and all are installed on the frame assembly; the frame assembly includes a fixed plate, a moving plate is arranged below the fixed plate, a bearing seat is fixedly installed at the midpoint of the bottom of the fixed plate, a threaded rod is fixedly installed on the bearing seat, the bottom end of the threaded rod penetrates through the moving plate and extends to the outside thereof, the threaded rod is in threaded connection with the moving plate, and a handle is fixedly connected to the bottom end of the threaded rod; the fastening assembly includes a vertical plate fixedly connected to the top of the moving plate, the top of the vertical plate penetrates through the fixed plate and extends to the outside thereof, a horizontal plate is movably connected to the left side of the vertical plate, the right side of the horizontal plate penetrates through the vertical plate and extends to the outside thereof, a fastening plate is fixedly connected to the left side of the horizontal plate, a slot is formed in the top of the horizontal plate, a plug rod is movably connected to the top of the vertical plate, a pulling plate is fixedly connected to the top end of the plug rod, the bottom end of the plug rod sequentially penetrates through the vertical plate and the slot and extends into the slot, and a spring is sleeved on the surface of the plug rod at a position between the vertical plate and the pulling plate. The above turning fixture for the thin-walled ring-shaped forging applies planar pressure to the forging by using three fastening assemblies, effectively avoiding the deformation of the forging and improving the fixing effect of the forging.

[0004] When the turning fixture for the thin-walled ring-shaped forging disclosed in the above utility model patent is in use, the ring-shaped forging is clamped by using three fastening assemblies to press the ring-shaped forging on the fixed plate. Before clamping, the ring-shaped forging needs to be positioned first so that the center of the ring-shaped forging is kept at a preset position for subsequent processing. However, positioning the ring-shaped forging takes a lot of time, resulting in a reduction in processing efficiency. Moreover, positioning errors will also have an adverse impact on the processing accuracy, making the use of the processing fixture inconvenient. Summary of the Utility Model

[0005] Aiming at the deficiencies in the prior art, the utility model provides a positioning fixture for turning a ring-shaped workpiece, which solves the problem of inconvenient use of the processing fixture in the prior art.

[0006] According to an embodiment of the utility model, a ring-shaped workpiece lathe processing positioning fixture comprises a base with a supporting surface, a movable rod which can be lifted and lowered in a vertical direction and a driving assembly which is transmission-connected to the movable rod are provided on the base, a driving head is provided at one end of the movable rod and the driving head is located above the supporting surface, an annular groove is provided on the driving head around the axial direction of the movable rod, and at least two rotatable clamping blocks are also provided on the base, the clamping blocks are respectively located above the supporting surface and the clamping blocks are spaced apart around the axial direction of the movable rod, the rotating axes of the clamping blocks are respectively parallel to the supporting surface and perpendicular to the axial direction of the movable rod, the ends of the clamping blocks close to the driving head are respectively extended into the annular grooves and abut against the driving head, the ends of the clamping blocks away from the driving head are respectively provided with clamping parts and the spacing between any two clamping parts and the axis of the movable rod is equal, when the driving assembly drives the movable rod to lift and lower, the driving head drives the clamping block to rotate and makes the clamping part approach or move away from the movable rod.

[0007] Furthermore, the base is provided with a first sliding groove matched with the movable rod, and the length direction of the first sliding groove is consistent with the vertical direction.

[0008] Furthermore, the base is also provided with a second slide groove connected with the first slide groove, and the length direction of the second slide groove is consistent with the horizontal direction. The driving assembly includes a movable pin movably arranged in the second slide groove, and the movable pin is provided with a reducing portion abutting against the movable rod, and the width dimension of the reducing portion in the vertical direction gradually increases along the horizontal direction.

[0009] Furthermore, the movable rod is provided with a slot for the movable pin to pass through, and the diameter-reducing portion extends into the slot and abuts against the inner wall of the slot.

[0010] Furthermore, the driving assembly also includes a driving screw rotatably arranged on the base, the axial direction of the driving screw is parallel to the length direction of the second slide groove, and a connecting plate is provided at one end of the movable pin and a threaded hole matching the driving screw is provided on the connecting plate.

[0011] Furthermore, a support seat is provided on the base, a through hole is provided on the support seat for installing the drive screw, and a locking nut matching with the drive screw is provided on the drive screw, and the locking nut abuts against the support seat.

[0012] Furthermore, a hand wheel is provided on the driving screw, and the hand wheel is located at an end of the driving screw away from the base.

[0013] Further, an installation seat is also provided on the base. The installation seat is arranged around the driving head, and the pressing blocks are respectively rotatably connected to the installation seat. An end cover is provided on the installation seat. The end cover is located above the driving head, and a spring abutting against the driving head is provided on a surface of the end cover close to the driving head. The spring urges the driving head to move towards the movable pin.

[0014] Further, a plurality of installation grooves are provided on the installation seat at intervals along the axial direction of the movable rod. The number of the installation grooves is the same as that of the pressing blocks. Installation rods are respectively arranged in the installation grooves, and installation holes matched with the installation rods are provided on the pressing blocks.

[0015] Further, cylindrical portions are respectively provided at one ends of the pressing blocks close to the driving head. The cylindrical portions respectively extend into the annular grooves and abut against the driving head.

[0016] Compared with the prior art, the utility model has the following beneficial effects: By adopting a base with a supporting surface for placing the annular workpiece to be processed, after the annular workpiece is placed on the supporting surface, both the driving head and the pressing blocks are located inside the annular workpiece. At this time, the driving assembly drives the movable rod to move up and down in the vertical direction and drives the driving head to act, and the driving head drives the pressing blocks to rotate so that the pressing portions move away from the movable rod until the pressing portions abut against the inner wall of the annular workpiece. At this time, the annular workpiece can be clamped by the pressing blocks respectively abutting against different positions of the inner wall of the annular workpiece. At the same time, during the rotation of the pressing blocks, the annular workpiece is pushed to move on the supporting surface so that the center of the annular workpiece moves to the axis of the movable rod, so as to position the annular workpiece and ensure that the center of the annular workpiece remains on the axis of the movable rod after being clamped, which is convenient for subsequent turning processing of the annular workpiece. It solves the technical problem of inconvenient use of the existing processing fixture, and produces the technical effects of positioning while clamping the annular workpiece and simplifying the workpiece clamping operation steps, and is convenient to use and the positioning is accurate and reliable. Description of the Drawings

[0017] Figure 1 is a schematic structural view of a turning processing positioning fixture for an annular workpiece according to an embodiment of the utility model;

[0018] Figure 2 is a sectional view of a turning processing positioning fixture for an annular workpiece according to an embodiment of the utility model;

[0019] Figure 3 is a schematic structural view of a movable rod in a turning processing positioning fixture for an annular workpiece according to an embodiment of the utility model;

[0020] Figure 4 is a schematic structural view of a movable pin in a turning processing positioning fixture for an annular workpiece according to an embodiment of the utility model;

[0021] Figure 5 The sectional view shows the annular workpiece being clamped by the turning and positioning fixture for an embodiment of the present utility model.

[0022] In the above-mentioned drawings: 1, base; 11, supporting surface; 12, first sliding groove; 13, second sliding groove; 14, supporting seat; 2, movable rod; 21, driving head; 22, annular groove; 23, slotted opening; 3, driving assembly; 31, movable pin; 32, diameter-changing part; 33, driving screw; 34, connecting plate; 35, threaded hole; 36, handwheel; 37, guiding part; 38, locking nut; 4, pressing block; 41, pressing part; 42, cylindrical part; 5, mounting seat; 51, end cover; 52, spring; 53, mounting groove; 54, mounting rod; 100, annular workpiece. Specific embodiments

[0023] The technical solutions in the present utility model will be further described below with reference to the drawings and embodiments.

[0024] As Figures 1 to 5 shown, an embodiment of the present utility model provides a turning and positioning fixture for an annular workpiece, which is used to clamp the annular workpiece 100 to be machined during the turning process of the annular workpiece 100, so as to fix the position of the annular workpiece 100.

[0025] Please refer to Figure 1 , Figure 2 and Figure 5, the turning and positioning fixture for the annular workpiece includes a base 1, the base 1 has a support surface 11 for placing the annular workpiece 100, a movable rod 2 that can be lifted and lowered in the vertical direction is provided on the base 1, and a driving component 3 is connected to the movable rod 2 in a driving manner. One end of the movable rod 2 is provided with a driving head 21, and the driving head 21 is located above the support surface 11. An annular groove 22 is provided around the axial direction of the movable rod 2 on the driving head 21. At least two rotatable abutting blocks 4 are further provided on the base 1. The abutting blocks 4 are respectively located above the support surface 11 and are arranged at intervals around the axial direction of the movable rod 2. The rotation axes of the abutting blocks 4 are respectively parallel to the support surface 11 and perpendicular to the axial direction of the movable rod 2. One ends of the abutting blocks 4 close to the driving head 21 respectively extend into the annular groove 22 and are in contact with the driving head 21. The ends of the abutting blocks 4 far from the driving head 21 are respectively provided with abutting portions 41, and the distances between any two of the abutting portions 41 and the axis of the movable rod 2 are equal. When the driving component 3 drives the movable rod 2 to lift and lower, the driving head 21 drives the abutting blocks 4 to rotate and makes the abutting portions 41 approach or move away from the movable rod 2. And the plurality of abutting blocks 4 move synchronously under the drive of the driving head 21. By abutting the abutting blocks 4 against the inner wall of the annular workpiece 100, the position of the annular workpiece 100 on the base 1 can be fixed. At the same time, the annular workpiece 100 is positioned by the abutting blocks 4 respectively abutting against different positions of the inner wall of the annular workpiece 100, so that the center of the annular workpiece 100 is kept on the axis of the movable rod 2, which is convenient for subsequent turning processing of the annular workpiece 100.

[0026] Specifically, the operation steps for clamping the annular workpiece 100 using the annular workpiece turning and machining positioning fixture provided in this embodiment are as follows: Place the to-be-machined annular workpiece 100 on the support surface 11. At this time, both the driving head 21 and the pressing block 4 are located inside the annular workpiece 100. Operate the driving assembly 3 to drive the movable rod 2 to move up and down in the vertical direction and drive the driving head 21 to act. The pressing blocks 4 respectively rotate under the drive of the driving head 21 to move the pressing portion 41 away from the movable rod 2 until the pressing portion 41 abuts against the inner wall of the annular workpiece 100. The annular workpiece 100 is fixed in position on the base 1 by the pressing blocks 4 respectively abutting against different positions on the inner wall of the annular workpiece 100. And during the rotation of the pressing blocks 4, the pressing blocks 4 push the annular workpiece 100 to move on the support surface 11 to move the center of the annular workpiece 100 to the axis of the movable rod 2, so as to position the annular workpiece 100 while clamping, and after clamping, the center of the annular workpiece 100 remains on the axis of the movable rod 2. The annular workpiece turning and machining positioning fixture provided in this embodiment can conveniently position and clamp the annular workpiece 100, effectively simplify the workpiece clamping operation steps, facilitate subsequent turning machining of the annular workpiece 100, and is convenient to use, with accurate and reliable positioning.

[0027] As Figure 2 , Figure 3 and Figure 4 shown, a first sliding groove 12 matching with the movable rod 2 is provided on the base 1, and the length direction of the first sliding groove 12 is consistent with the vertical direction. The first sliding groove 12 provided on the base 1 is used to guide the movable rod 2 to move on the base 1, prevent the movable rod 2 from deviating from the preset direction during movement, and is beneficial to improving the reliability of the annular workpiece turning and machining positioning fixture.

[0028] Specifically, a second chute 13 communicating with the first chute 12 is further provided on the base 1. The length direction of the second chute 13 is consistent with the horizontal direction. The driving assembly 3 includes a movable pin 31 movably arranged in the second chute 13. A diameter-changing portion 32 abutting against the movable rod 2 is provided on the movable pin 31, and the width dimension of the diameter-changing portion 32 in the vertical direction gradually increases along the horizontal direction. The driving assembly 3 includes a movable pin 31 movably arranged in the second chute 13. The length direction of the second chute 13 is the horizontal direction to limit the moving direction of the movable pin 31 to the horizontal direction, and the second chute 13 communicates with the first chute 12, so that the movable pin 31 can enter the first chute 12 and the diameter-changing portion 32 abuts against the movable rod 2. When the movable pin 31 moves in the second chute 13, the movable rod 2 can be pushed to rise in the vertical direction through the diameter-changing portion 32. At this time, the tightening block 4 rotates driven by the driving head 21 to make the tightening portion 41 away from the movable rod 2. When the movable pin 31 moves reversely in the second chute 13, the movable rod 2 descends in the vertical direction under the action of gravity. At this time, the tightening block rotates driven by the driving head 21 to make the tightening portion 41 close to the movable rod 2, so as to realize the clamping and unlocking of the annular workpiece 100. One end of the movable pin 31 is provided with a guiding portion 37 connected to the diameter-changing portion 32, and the guiding portion 37 fits with the inner wall of the second chute 13, so that the movable pin 31 moves smoothly on the base 1.

[0029] Please refer to Figure 3 and Figure 4 In this embodiment, a slot 23 for the movable pin 31 to pass through is provided on the movable rod 2. The diameter-changing portion 32 extends into the slot 23 and abuts against the inner wall of the slot 23. By providing the slot 23 on the movable rod 2 for the movable pin 31 to pass through and enabling the diameter-changing portion 32 to enter the slot 23, the stability of the cooperation between the movable pin 31 and the movable rod 2 can be improved through the fit between the diameter-changing portion 32 and the inner wall of the slot 23, thereby improving the reliability of the turning and positioning fixture for the annular workpiece.

[0030] As Figure 2 and Figure 5As shown, the driving assembly 3 further includes a driving screw 33 rotatably arranged on the base 1. The axial direction of the driving screw 33 is parallel to the length direction of the second chute 13. One end of the movable pin 31 is provided with a connecting plate 34, and a threaded hole 35 matching with the driving screw 33 is arranged on the connecting plate 34. When the driving screw 33 is rotated, the connecting plate 34 can be driven to move along the axial direction of the driving screw 33 through the cooperation of the threaded hole 35 and the driving screw 33, and then the movable pin 31 is driven to slide horizontally in the second chute 13, so as to control the abutting part 41 on the abutting block 4 to abut against or move away from the annular workpiece 100, facilitating the operation of the turning machining positioning fixture for the annular workpiece to clamp or release the annular workpiece 100.

[0031] Specifically, a support seat 14 is further arranged on the base 1. A through hole for installing the driving screw 33 is arranged on the support seat 14. A locking nut 38 matching with the driving screw 33 is further arranged on the driving screw 33, and the locking nut 38 abuts against the support seat 14. The support seat 14 is arranged on the base 1 for installing the driving screw 33. One end of the driving screw 33 away from the support seat 14 is rotatably connected to the base 1, and a locking nut 38 is arranged on the driving screw 33. After rotating the driving screw 33 to make the abutting part 41 abut against the annular workpiece 100, rotate the locking nut 38 to make the locking nut 38 abut against the support seat 14. At this time, the position of the driving screw 33 can be locked through the friction between the locking nut 38 and the support seat 14, preventing the driving screw 33 from rotating unexpectedly, which may cause the movable pin 31 to move and the abutting block 4 to become loose, and avoiding the position of the annular workpiece 100 on the turning machining positioning fixture for the annular workpiece from moving during the machining process.

[0032] As Figure 2 shown, a handwheel 36 is further arranged on the driving screw 33. The handwheel 36 is located at one end of the driving screw 33 away from the base 1. Operating the handwheel 36 arranged at the end of the driving screw 33 can conveniently rotate the driving screw 33 and control the rotation direction of the driving screw 33, so that the turning machining positioning fixture for the annular workpiece clamps or releases the annular workpiece 100, facilitating the operation of the turning machining positioning fixture for the annular workpiece.

[0033] Please refer to Figure 1 and Figure 2, a mounting base 5 is further provided on the base 1. The mounting base 5 is arranged around the driving head 21, and the pressing blocks 4 are respectively rotatably connected to the mounting base 5. An end cover 51 is provided on the mounting base 5. The end cover 51 is located above the driving head 21, and a spring 52 abutting against the driving head 21 is provided on a surface of the end cover 51 close to the driving head 21. The spring 52 urges the driving head 21 to move towards the movable pin 31. The mounting base 5 provided on the base 1 is used for mounting the pressing blocks 4, so that the positions of the pressing blocks 4 on the base 1 are kept stable and are stably matched with the driving head 21. The end cover 51 is provided on the base 1, and the spring 52 abutting against the driving head 21 is provided on the end cover 51. The elastic force provided by the spring 52 can keep the movable rod 2 in abutment with the movable pin 31, preventing the movable rod 2 from disengaging from the movable pin 31 during the movement of the movable pin 31. At the same time, when the movable pin 31 is moved to release the locking of the annular workpiece 100, the spring 52 pushes the movable head to descend in the vertical direction, so as to quickly release the annular workpiece 100.

[0034] Specifically, a plurality of mounting grooves 53 are provided on the mounting base 5 at intervals around the axis of the movable rod 2. The number of the mounting grooves 53 is the same as that of the pressing blocks 4. Mounting rods 54 are respectively arranged in the mounting grooves 53, and mounting holes matching the mounting rods 54 are provided on the pressing blocks 4. A plurality of the mounting grooves 53 for accommodating the pressing blocks 4 are provided on the mounting grooves 53. The mounting rods 54 are respectively arranged in the mounting grooves 53 for mounting the pressing blocks 4, ensuring the reliable cooperation between the pressing blocks 4 and the mounting base 5, which is beneficial to improving the structural stability of the turning and positioning fixture for the annular workpiece.

[0035] As Figure 2 shown, cylindrical portions 42 are respectively provided at one ends of the pressing blocks 4 close to the driving head 21. The cylindrical portions 42 respectively extend into the annular grooves 22 and abut against the driving head 21. By providing the cylindrical portions 42 at the ends of the pressing blocks 4, the contact area between the pressing blocks 4 and the annular grooves 22 is increased. During the rotation of the pressing blocks 4, the cylindrical portions 42 are kept in the annular grooves 22, enabling the pressing blocks 4 to rotate smoothly driven by the driving head 21, ensuring the firm clamping of the turning and positioning fixture for the annular workpiece on the annular workpiece 100.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present utility model, and they should all be covered within the scope of the claims of the present utility model.

Claims

1. A turning positioning fixture for a ring workpiece, characterized in that: It includes a base having a support surface, on which there is a movable rod that can be lifted and lowered in the vertical direction and a driving assembly connected to the movable rod in a transmission manner. One end of the movable rod is provided with a driving head, and the driving head is located above the support surface. An annular groove is provided around the axial direction of the movable rod on the driving head. There are also at least two rotatable pressing blocks on the base. The pressing blocks are respectively located above the support surface and are arranged at intervals around the axial direction of the movable rod. The rotation axes of the pressing blocks are respectively parallel to the support surface and perpendicular to the axial direction of the movable rod. One ends of the pressing blocks close to the driving head respectively extend into the annular groove and are in contact with the driving head. The other ends of the pressing blocks away from the driving head are respectively provided with pressing parts, and the distances between any two pressing parts and the axis of the movable rod are equal. When the driving assembly drives the movable rod to lift and lower, the driving head drives the pressing blocks to rotate and makes the pressing parts approach or move away from the movable rod.

2. The positioning fixture for turning processing of an annular workpiece according to claim 1, wherein: A first chute that cooperates with the movable rod is provided on the base, and the length direction of the first chute is consistent with the vertical direction.

3. The positioning fixture for turning a ring-shaped workpiece according to claim 2, characterized in that: A second chute communicating with the first chute is also provided on the base, and the length direction of the second chute is consistent with the horizontal direction. The driving assembly includes a movable pin movably arranged in the second chute. A variable-diameter part that is in contact with the movable rod is provided on the movable pin, and the width dimension of the variable-diameter part in the vertical direction gradually increases along the horizontal direction.

4. The positioning fixture for turning a ring workpiece according to claim 3, wherein: A slot through which the movable pin passes is provided on the movable rod, and the variable-diameter part extends into the slot and is in contact with the inner wall of the slot.

5. The positioning fixture for turning a ring workpiece according to claim 3, wherein: The driving assembly further includes a driving screw rotatably arranged on the base. The axial direction of the driving screw is parallel to the length direction of the second chute. One end of the movable pin is provided with a connecting plate, and a threaded hole that cooperates with the driving screw is provided on the connecting plate.

6. The positioning fixture for turning a ring workpiece according to claim 5, characterized in that: A support seat is also provided on the base. A through hole for installing the driving screw is provided on the support seat. A locking nut that cooperates with the driving screw is also provided on the driving screw, and the locking nut is in contact with the support seat.

7. The positioning fixture for turning a ring workpiece according to claim 5, characterized in that: A handwheel is also provided on the driving screw, and the handwheel is located at the end of the driving screw away from the base.

8. The positioning fixture for turning a ring-shaped workpiece according to claim 3, characterized in that: An installation seat is also provided on the base. The installation seat surrounds the driving head, and the pressing blocks are respectively rotatably connected to the installation seat. An end cover is provided on the installation seat. The end cover is located above the driving head, and a spring that is in contact with the driving head is provided on the surface of the end cover close to the driving head. The spring drives the driving head to move towards the direction close to the movable pin.

9. The positioning fixture for turning a ring-shaped workpiece according to claim 8, characterized in that: A plurality of installation grooves are provided at intervals around the axial direction of the movable rod on the installation seat. The number of the installation grooves is the same as the number of the pressing blocks. Installation rods are respectively provided in the installation grooves, and installation holes that cooperate with the installation rods are provided on the pressing blocks.

10. A rotary workpiece turning and positioning fixture according to claim 1, characterized in that: Columnar parts are respectively provided at the ends of the pressing blocks close to the driving head, and the columnar parts respectively extend into the annular groove and are in contact with the driving head.

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