Quick positioning and clamping device for slotting machining of inner teeth of disc workpieces

Abstract

The utility model discloses a quick positioning and clamping device for slotting machining of internal teeth of disc type workpieces, which relates to the technical field of tooth machining and comprises an expansion sleeve, a positioning seat and a pull rod, a plurality of partition grooves are formed in the outer side of the expansion sleeve in the circumferential direction of the expansion sleeve, and cavities are formed in the upper end and the lower end of the expansion sleeve. The diameter of a cavity in the upper end of the expansion sleeve is matched with the diameter of the lower end of a to-be-machined part. A cavity matched with the expansion sleeve is formed in the upper portion of the positioning seat, and the expansion sleeve is arranged in the cavity in a sliding mode in the axial direction of the expansion sleeve. The pull rod is used for pulling the expansion sleeve to slide downwards and enabling the expansion sleeve to generate elastic deformation to clamp a part to be machined. According to the rapid positioning and clamping device for slotting machining of the inner teeth of the disc type workpiece, the expansion sleeve is pulled by the pull rod to generate elastic deformation to clamp and fix a part to be machined, so that rapid clamping of the part to be machined is achieved, and positioning is accurate and stable.

Description

Technical Field

[0001] This utility model relates to the field of gear machining technology, specifically a quick positioning and clamping device for internal gear planing of disc-shaped workpieces. Background Technology

[0002] In the daily process of new product development, we often encounter a special type of disc-shaped workpiece. Its internal cavity is composed of internal straight teeth and a smooth hole, and the major diameter of the internal straight teeth is larger than the diameter of the inner hole. This type of workpiece can only be made by planing the internal teeth.

[0003] Because the workpiece itself has strict form and position tolerance requirements for its internal straight teeth, internal hole, and outer diameter of the external boss, when using the workpiece's internal hole as a reference to cut internal teeth, the internal straight tooth empty groove is not wide enough to accommodate cutting chips, which affects the machining and the service life of the cutting tool. When using a three-jaw chuck to cut internal straight teeth with the workpiece's external boss as a reference, the precision limitation of the three-jaw chuck causes the form and position tolerances of the machined internal straight teeth, internal hole, and outer diameter of the external boss to occasionally exceed the tolerance, resulting in the production of defective products. In addition, the three-jaw chuck relies on manual operation, which is inefficient and labor-intensive, so it is not an ideal positioning solution.

[0004] Therefore, it is necessary to propose a rapid positioning and clamping device for the internal gear cutting of disc-shaped workpieces to solve the above problems. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] The purpose of this utility model is to provide a quick positioning and clamping device for internal gear planing of disc-shaped workpieces, so as to solve the problems of inconvenient workpiece clamping and limited positioning accuracy of existing positioning devices for internal gear planing of disc-shaped workpieces mentioned in the background art.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a quick positioning and clamping device for internal gear planing of disc-shaped workpieces, comprising:

[0009] An expansion sleeve is provided with several dividing grooves along its circumference on its outer side. Both the upper and lower ends of the expansion sleeve are provided with cavities. The diameter of the upper cavity of the expansion sleeve is adapted to the diameter of the lower end of the part to be processed.

[0010] The positioning seat has a cavity on its upper part that is adapted to the expansion sleeve, and the expansion sleeve is slidably arranged in the cavity along its axial direction.

[0011] A pull rod is used to pull the expansion sleeve downward and cause it to elastically deform to clamp the part to be processed.

[0012] Preferably, the pull rod and the expansion sleeve are arranged coaxially, one end of the pull rod is provided with a disc, and the other end of the pull rod passes through the expansion sleeve and the positioning seat in sequence and is connected to the drive mechanism.

[0013] Preferably, a disc spring is provided between the expansion sleeve and the positioning seat, and the disc spring is sleeved on the outside of the pull rod.

[0014] Preferably, the outer side of the expansion sleeve is provided with a limiting ring, the upper end of the positioning seat is fixedly connected with a clamping ring, and the inner side of the clamping ring is provided with an annular groove that matches the limiting ring.

[0015] Preferably, when the expansion sleeve moves to its limit position, the disc spring is in a compressed state.

[0016] Preferably, the outer wall of the expansion sleeve is provided with a first cylindrical surface, a second cylindrical surface, a third cylindrical surface and a fourth cylindrical surface from top to bottom. The first cylindrical surface and the third cylindrical surface are slidably connected to the compression ring and the positioning seat, respectively. The second cylindrical surface is located outside the limiting ring. The diameter of the fourth cylindrical surface is smaller than the diameter of the positioning seat cavity.

[0017] Preferably, the upper end face of the limiting ring is provided with a first conical surface, and a second conical surface is provided between the ring groove and the inner wall of the compression ring. The angle between the first conical surface and the axis of the expansion sleeve is less than the angle between the second conical surface and the axis of the compression ring by 3° to 5°.

[0018] Preferably, the bottom of the upper cavity of the expansion sleeve protrudes upward to form a frustum, and the frustum transitions to the cavity wall by an arc.

[0019] Preferably, it also includes a transition connecting plate, wherein the bottom center of the positioning seat is provided with a concave stop, and the top center of the transition connecting plate is provided with a convex stop that matches the concave stop, and the positioning seat is fixedly connected to the transition connecting plate.

[0020] (III) Beneficial Effects

[0021] Compared with the prior art, this utility model provides a quick positioning and clamping device for internal gear planing of disc-shaped workpieces, which has the following advantages:

[0022] 1. This quick positioning and clamping device for internal gear cutting of disc-shaped workpieces uses a positioning seat with an expansion sleeve that is pulled downward by a pull rod inside the positioning seat. Under the pull of the pull rod, the upper cavity of the expansion sleeve undergoes elastic deformation to clamp and fix the workpiece to be processed, thereby achieving quick clamping of the workpiece with accurate and stable positioning.

[0023] 2. The quick positioning and clamping device for internal gear cutting of disc-shaped workpieces is equipped with a disc spring, which enables the expansion sleeve to automatically reset. At the same time, under the action of the disc spring, the inner diameter of the upper end of the expansion sleeve is always in an opening trend and maintains the maximum diameter, making it more convenient to load and unload the parts to be processed. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the relaxed state of the expansion sleeve of this utility model;

[0025] Figure 2 This is a schematic diagram of the workpiece being clamped by the expansion sleeve of this utility model;

[0026] Figure 3 This utility model Figure 1 Schematic diagram at point A;

[0027] Figure 4 This utility model Figure 2 Schematic diagram at point B;

[0028] Figure 5 This is a cross-sectional schematic diagram of the expansion sleeve of this utility model;

[0029] Figure 6 This is a top view of the expansion sleeve of this utility model;

[0030] Figure 7 This is a cross-sectional schematic diagram of the positioning seat of this utility model;

[0031] Figure 8 This is a cross-sectional schematic diagram of the transition connecting disc of this utility model.

[0032] In the diagram: 1. Pull rod; 2. Expansion sleeve; 3. Disc spring; 4. Compression ring; 5. Positioning seat; 6. Transition connecting plate; 7. Part to be processed; 8. Annular groove; 9. Limiting ring; 10. Through hole; 11. Frustum; 12. First cylindrical surface; 13. Second cylindrical surface; 14. Third cylindrical surface; 15. Fourth cylindrical surface; 16. Dividing groove; 17. Concave stop; 18. Convex stop. Detailed Implementation

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0034] Please see Figure 1-8As shown, a quick positioning and clamping device for internal gear planing of disc-shaped workpieces includes an expansion sleeve 2, with several circumferentially divided grooves 16 on its outer side. Both the upper and lower ends of the expansion sleeve 2 have cavities, the diameter of the upper cavity of the expansion sleeve 2 being adapted to the lower diameter of the workpiece 7 to be processed; a positioning seat 5, the upper part of which has a cavity adapted to the expansion sleeve 2, the expansion sleeve 2 slidingly within the cavity along its axial direction; and a pull rod 1, used to pull the expansion sleeve 2 downwards and cause it to elastically deform to clamp the workpiece 7 to be processed. Preferably, the diameter of the upper cavity is slightly larger than the bottom diameter of the workpiece 7 by 0.04-0.07 mm to facilitate loading and unloading of the workpiece.

[0035] When positioning the part to be processed 7, the lower end of the part to be processed 7 is placed in the upper cavity of the expansion sleeve 2. The expansion sleeve 2 is pulled down in the cavity by the pull rod 1. When the lower end face of the expansion sleeve 2 contacts the bottom surface of the cavity, the pull rod 1 continues to move down to make the expansion sleeve 2 elastically deform, thereby driving the cavity wall of the upper cavity of the expansion sleeve 2 to converge towards the center to clamp the part to be processed 7.

[0036] Specifically, the pull rod 1 and the expansion sleeve 2 are arranged coaxially. One end of the pull rod 1 is equipped with a disc, and the other end of the pull rod 1 passes through the expansion sleeve 2 and the positioning seat 5 in sequence and is connected to the drive mechanism. By arranging the pull rod 1 and the expansion sleeve 2 coaxially, the force on the expansion sleeve 2 is balanced.

[0037] To achieve automatic reset of the expansion sleeve 2, a disc spring 3 is provided between the expansion sleeve 2 and the positioning seat 5, and the disc spring 3 is sleeved on the outside of the pull rod 1. When the pull rod 1 pulls the expansion sleeve 2 downward, the disc spring 3 is compressed; the expansion sleeve 2 undergoes elastic deformation under force, and the upper cavity shrinks inward to clamp the part to be processed; when the pull rod 1 resets, the elastic deformation of the expansion sleeve 2 is eliminated, the inward shrinkage force is released, and the disc spring 3 pressure pushes the expansion sleeve 2 upward to reset.

[0038] In some embodiments, a limiting ring 9 is provided on the outer side of the expansion sleeve 2, and a clamping ring 4 is fixedly connected to the upper end of the positioning seat 5 by screws. The inner side of the clamping ring 4 is provided with an annular groove 8 that matches the limiting ring 9. By setting the clamping ring 4, the expansion sleeve 2 is limited by the cooperation of the limiting ring 9 and the annular groove 8 to prevent the expansion sleeve 2 from dislodging from the cavity when it moves upward. Preferably, when the expansion sleeve 2 is at its upper limit position, the disc spring 3 is in a compressed state. Under the action of the disc spring 3, an upward thrust is applied to the expansion sleeve 2, so that the inner diameter of the upper end of the expansion sleeve 2 is always in an opening trend and maintains the maximum diameter, so as to facilitate the loading and unloading of the part 7 to be processed.

[0039] Specifically, the outer wall of the expansion sleeve 2 is provided with a first cylindrical surface 12, a second cylindrical surface 13, a third cylindrical surface 14 and a fourth cylindrical surface 15 from top to bottom. The first cylindrical surface 12 and the third cylindrical surface 14 are slidably connected to the clamping ring 4 and the positioning seat 5, respectively. The second cylindrical surface 13 is located outside the limiting ring 9. The diameter of the fourth cylindrical surface 15 is smaller than the diameter of the cavity of the positioning seat 5. Preferably, the second cylindrical surface 13, the third cylindrical surface 14, and the fourth cylindrical surface 15 transition with decreasing straight steps. The outer diameter of the first cylindrical surface 12 is 0.05-0.08 mm smaller than the inner diameter of the clamping ring 4. The outer diameter of the second cylindrical surface 13 is 0.5-0.8 mm smaller than the diameter of the annular groove 8. The third cylindrical surface 14 is 0.02-0.05 mm smaller than the cavity diameter of the positioning seat 5, ensuring a small gap for it to slide up and down. The outer diameter of the fourth cylindrical surface 15 is 2-4 mm smaller than the outer diameter of the third cylindrical surface 14, in order to reduce the friction between the outer wall of the expansion sleeve 2 and the inner wall of the cavity of the positioning seat 5 and the elastic deformation of the expansion sleeve 2, and the interference between the lower part of the expansion sleeve 2 and the inner cavity of the positioning seat 5 when it expands outward.

[0040] In some embodiments, the upper end face of the limiting ring 9 is provided with a first conical surface, and the annular groove 8 and the inner wall of the clamping ring 4 are provided with a second conical surface. The angle between the first conical surface and the axis of the expansion sleeve 2 is less than the angle between the second conical surface and the axis of the clamping ring 4 by 3° to 5°.

[0041] By setting a first conical surface and a second conical surface with different inclination angles, it has a certain amount of room for movement. When the expansion sleeve 2 moves to the limit position, the disc spring 3 continuously applies an upward thrust to the expansion sleeve 2, so that the inner diameter of the upper end of the expansion sleeve 2 can always be in an opening trend and maintain the maximum diameter.

[0042] To ensure sufficient deformation space in the upper cavity of the expansion sleeve 2, a frustum 11 is formed by an upward protrusion at the bottom of the upper cavity of the expansion sleeve 2, with the frustum 11 transitioning to the cavity wall by an arc. By setting the arc transition, stress concentration is avoided, which could lead to deformation or breakage of the cavity sidewall.

[0043] In some embodiments, to facilitate the installation and fixing of the positioning seat 5, a transition connecting plate 6 is also included. The positioning seat 5 has a recessed stop 17 at the center of its bottom end, and the transition connecting plate 6 has a convex stop 18 at the center of its top end that matches the recessed stop 17. The positioning seat 5 and the transition connecting plate 6 are fixedly connected. The cooperation of the recessed stop 17 and the convex stop 18 prevents the positioning seat 5 and the transition connecting plate 6 from shifting or misaligning during assembly. Specifically, each outer end face of the transition connecting plate 6 is provided with a set of threaded holes and stepped holes. The number, center distance, and size of the threaded holes match the bolt connection holes on the positioning seat 5, so that the positioning seat 5 and the transition connecting plate 6 are fixedly connected by screws. The number, center distance, and size of the stepped holes match the threaded holes on the machine tool worktable, so that the transition connecting plate 6 is fixed to the machine tool worktable by bolts.

[0044] Working principle: Assemble, align and securely fasten the transition connecting plate 6 to the machine tool worktable, and connect the bottom end of the tie rod 1 to the hydraulic device of the machine tool.

[0045] Before the part to be processed 7 is installed, the pull rod 1 is not subjected to any external force, the disc spring 3 is in a slightly compressed state, and the expansion sleeve 2 is disengaged from the bottom surface of the cavity of the positioning seat 5 under the action of the disc spring 3. Its upper first conical surface contacts the second conical surface of the clamping ring 4. Under the action of the disc spring 3, the inner diameter of the upper end of the expansion sleeve 2 is always in an opening trend and maintains the maximum diameter so as to facilitate the loading and unloading of the part to be processed 7.

[0046] The inspected and qualified workpiece is placed into the upper cavity of the expansion sleeve 2. The lower end face of the workpiece 7 is axially positioned by the frustum 11. At this time, the upper cavity of the expansion sleeve 2 only serves as a pre-positioning function. Then, the machine tool hydraulic tensioning button is activated, causing the pull rod 1 to slowly descend under the action of the hydraulic tensioning device. Under the external force of the pull rod 1, the expansion sleeve 2 descends along the cavity wall of the positioning seat 5. The disc spring 3 is gradually compressed until the lower end face of the expansion sleeve 2 is in contact with the bottom surface of the cavity of the positioning seat 5, and the expansion sleeve 2 stops descending. However, as the pull rod 1 continues to descend, the bottom surface of the upper cavity of the expansion sleeve 2 continues to be subjected to force. This force will be released to the outer wall of the upper cavity of the expansion sleeve 2 through the several rib plates of the expansion sleeve 2. Because the third cylindrical surface 14 of the expansion sleeve 2 is constrained by the inner cavity wall of the positioning seat 5, the fourth cylindrical surface 15 of the expansion sleeve 2 will open outward under the action of external force. At this time, the first cylindrical surface 12 of the expansion sleeve 2 will contract inward with a certain annular surface on the third cylindrical surface 14 as the fulcrum, so as to achieve efficient and precise positioning and clamping effect.

[0047] After the workpiece 7 is finished, the hydraulic tension reset button is activated, and the axial tension on the expansion sleeve 2 is slowly released. The pressure on the disc spring 3 is also gradually reduced until the pull rod 1 returns to its natural state. At this time, the disc spring 3 is still under slight pressure. The expansion sleeve 2 returns to the state before the workpiece is installed, that is, the inner diameter of the upper end of the expansion sleeve 2 is in the opening trend and maintains the maximum diameter, so as to remove the workpiece and repeat the operation to install the next workpiece to be processed.

[0048] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A quick positioning and clamping device for internal gear planing machining of disc-shaped workpieces, characterized in that, include: The expansion sleeve (2) has several dividing grooves (16) on its outer side along its circumference. Both the upper and lower ends of the expansion sleeve (2) are provided with cavities. The diameter of the upper cavity of the expansion sleeve (2) is adapted to the diameter of the lower end of the part to be processed (7). The positioning seat (5) has a cavity on its upper part that is adapted to the expansion sleeve (2), and the expansion sleeve (2) is slidably arranged in the cavity along its axial direction; A pull rod (1) is used to pull the expansion sleeve (2) downward and cause it to elastically deform to clamp the workpiece (7).

2. The quick positioning and clamping device for internal gear planing machining of disc-shaped workpieces according to claim 1, characterized in that: The pull rod (1) is coaxially arranged with the expansion sleeve (2). One end of the pull rod (1) is provided with a disc, and the other end of the pull rod (1) passes through the expansion sleeve (2) and the positioning seat (5) in sequence and is connected to the drive mechanism.

3. The quick positioning and clamping device for internal gear planing of disc-shaped workpieces according to claim 1, characterized in that: A disc spring (3) is provided between the expansion sleeve (2) and the positioning seat (5), and the disc spring (3) is sleeved on the outside of the pull rod (1).

4. The quick positioning and clamping device for internal gear planing of disc-shaped workpieces according to claim 3, characterized in that: The expansion sleeve (2) is provided with a limiting ring (9) on the outside, and a pressure ring (4) is fixedly connected to the upper end of the positioning seat (5). The inner side of the pressure ring (4) is provided with an annular groove (8) that matches the limiting ring (9).

5. The quick positioning and clamping device for internal gear shaping of disc-shaped workpieces according to claim 4, characterized in that: When the expansion sleeve (2) moves to its limit position, the disc spring (3) is in a compressed state.

6. The quick positioning and clamping device for internal gear planing of disc-shaped workpieces according to claim 4, characterized in that: The outer wall of the expansion sleeve (2) is provided with a first cylindrical surface (12), a second cylindrical surface (13), a third cylindrical surface (14) and a fourth cylindrical surface (15) from top to bottom. The first cylindrical surface (12) and the third cylindrical surface (14) are slidably connected to the clamping ring (4) and the positioning seat (5) respectively. The second cylindrical surface (13) is located outside the limiting ring (9). The diameter of the fourth cylindrical surface (15) is smaller than the diameter of the cavity of the positioning seat (5).

7. The quick positioning and clamping device for internal gear planing of disc-shaped workpieces according to claim 5, characterized in that: The upper end face of the limiting ring (9) is provided with a first conical surface, and the inner wall of the ring groove (8) and the compression ring (4) is provided with a second conical surface. The angle between the first conical surface and the axis of the expansion sleeve (2) is less than the angle between the second conical surface and the axis of the compression ring (4) by 3° to 5°.

8. The quick positioning and clamping device for internal gear planing of disc-shaped workpieces according to claim 1, characterized in that: The upper cavity bottom of the expansion sleeve (2) protrudes upward to form a frustum (11), and the frustum (11) transitions to the cavity wall by an arc.

9. The quick positioning and clamping device for internal gear planing of disc-shaped workpieces according to claim 1, characterized in that: It also includes a transition connecting plate (6), the bottom center of the positioning seat (5) is provided with a concave stop (17), the top center of the transition connecting plate (6) is provided with a convex stop (18) that matches the concave stop (17), and the positioning seat (5) is fixedly connected to the transition connecting plate (6).

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