Holding device for precise turning of cap-shaped flexible gear

Abstract

The enclasping device comprises a holder installed on a liquid expansion clamp, the holder is annularly arranged, a plurality of containing grooves are evenly distributed in the peripheral wall of the holder in the circumferential direction, a centrifugal block is movably connected into each containing groove, the outer end of each centrifugal block can stretch out of the corresponding containing groove, and the outer end of each centrifugal block can stretch out of the corresponding containing groove. And the sealing ring is used for abutting against the inner peripheral wall of the cap-shaped flexible gear. In the turning process of the cap-shaped flexible gear, the retainer can synchronously rotate along with a liquid expansion clamp on a lathe, and under the action of centrifugal force, the outer end of the centrifugal block extends out of the containing groove and abuts against the inner circumferential wall of a seam allowance at the brim end of the cap-shaped flexible gear; along with the increase of the rotating speed of the transmission shaft, the larger the centrifugal force is, the larger the pressing force of the centrifugal block is, so that the cap-shaped flexible gear is firmly held, slipping of the cap-shaped flexible gear during turning is avoided, the clamping force does not need to be improved through a hydraulic clamp, and the stability of product turning is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of tooling technology for precision turning of flexible wheels, specifically a clamping device for precision turning of cap-shaped flexible wheels. Background Technology

[0002] Harmonic reducers are high-precision and high-torque mechanical transmission devices that achieve high-precision transmission through the staggered tooth motion of a flexible wheel and a rigid wheel. Due to their small size, large transmission ratio, and high precision, they are widely used in industrial robots, CNC machine tools, and humanoid robots.

[0003] Flexible wheels can be divided into two types: cup-shaped and cap-shaped. Cap-shaped flexible wheels have complex curved surfaces and thin-walled structures. As a core component of harmonic reducers, cap-shaped flexible wheels need to withstand high-frequency alternating loads. Their thin-walled structure (usually with a wall thickness ≤2mm) places extremely high demands on the material's fatigue resistance, machining accuracy, and assembly process. Cap-shaped flexible wheels need to combine high strength, high precision, and lightweight characteristics. Although traditional metal materials meet the strength requirements, they are prone to deformation during machining due to cutting forces or improper clamping. For example, excessive clamping force in traditional fixtures (such as hydraulic fixtures) can cause plastic deformation of the workpiece, while insufficient clamping force can easily cause slippage during turning, affecting machining stability. In addition, the cap diameter of the cap-shaped flexible wheel is relatively large compared to the positioning inner hole diameter, and the cap is relatively thin. During turning, it is easy to induce multi-order vibrations, leading to excessive waviness, accelerated tool wear, and affecting surface roughness and roundness errors. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a clamping device that can clamp a cap-shaped flexible wheel during precision turning, so as not to cause plastic deformation of the workpiece and to avoid slippage during turning.

[0005] The technical solution of this utility model is to provide a clamping device for precision turning of a cap-shaped flexible wheel, having the following structure:

[0006] The device includes a retainer mounted on a hydraulic expansion clamp. The retainer is arranged in a ring shape and has several accommodating grooves evenly distributed circumferentially on its outer peripheral wall. A centrifugal block is movably connected in each accommodating groove. The outer end of the centrifugal block can extend out of the accommodating groove to abut against the inner peripheral wall of the cap-shaped flexible wheel.

[0007] With the above structure, the clamping device of this utility model for precision turning of hat-shaped flexible wheels has the following advantages compared with the prior art:

[0008] During the turning of a cap-shaped flexible wheel, the cage rotates synchronously with the hydraulic clamp on the lathe. Under centrifugal force, the outer end of the centrifugal block extends out of the receiving groove and abuts against the inner circumferential wall of the cap-shaped flexible wheel's brim end stop. As the drive shaft speed increases, the centrifugal force increases, and the clamping force of the centrifugal block also increases, thus firmly holding the cap-shaped flexible wheel and preventing slippage during turning. This eliminates the need for hydraulic clamps to increase the clamping force, ensuring the stability of the product during turning. Furthermore, when the centrifugal block passively contacts the cap-shaped flexible wheel under centrifugal force, it generates a counter-centrifugal force, which can counteract the cutting force fluctuation component and reduce the vibration caused by the thin-walled structure of the cap-shaped flexible wheel under high-speed rotation, thereby reducing tool wear and improving the product's machining accuracy and stability. When the turning process is completed, the drive shaft stops rotating, the centrifugal force disappears, and the centrifugal block automatically releases its grip on the cap-shaped flexible wheel.

[0009] Preferably, a spring is also provided in the receiving groove, with one end of the spring connected to the inner bottom wall of the receiving groove and the other end connected to the inner end of the centrifuge block; in the initial state, the outer end of the centrifuge block is located in the receiving groove. This arrangement facilitates the clamping of the product, and when the turning is completed, the spring can reset the centrifuge block, making it easy to remove the product.

[0010] Preferably, the cross-section of the receiving groove is trapezoidal, with a smaller outer diameter and a larger inner diameter; the centrifugal block matches the shape of the receiving groove, and the width of the inner end of the centrifugal block is greater than the size of the opening at the outer end of the receiving groove. This prevents the centrifugal block from detaching from the receiving groove and limits the distance the outer end of the centrifugal block extends, preventing the cap-shaped flexible wheel from being deformed due to excessive centrifugal force.

[0011] Preferably, the retainer includes a frame and a cover plate; the receiving slot is disposed on the frame, and one side wall of the receiving slot is open; the cover plate is connected to the side wall of the frame and is used to partially cover the open end of the side wall of the receiving slot. The open end of one side wall of the receiving slot facilitates the assembly of centrifuge blocks. After the centrifuge blocks are inserted into the receiving slot, the cover plate is used to cover the open end of the side wall of the receiving slot to prevent the centrifuge blocks from falling out.

[0012] Preferably, the cover plate has several through holes evenly distributed around its circumference, and the side wall of the frame has screw holes corresponding to the through holes. Screws are provided in the through holes, and the connecting end of the screws passes through the through holes and connects with the corresponding screw holes to fix the cover plate to the frame.

[0013] Preferably, the side wall of the frame is provided with a recess that matches the shape of the cover plate, the cover plate is connected in the recess, and the outer side wall of the cover plate is flush with the side wall of the frame.

[0014] Preferably, the outer end face of the centrifugal block is arc-shaped, which results in a more uniform distribution of contact stress when it comes into contact with the cap-shaped flexible wheel, thus avoiding localized plastic deformation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a half-sectional view of the present invention.

[0017] Figure 3 This is an exploded view of the cage in this utility model.

[0018] Figure 4 This is a cross-sectional view of the present invention in its usage state.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. Cage; 11. Frame; 111. Receiving groove; 112. Screw hole; 113. Recess; 12. Cover plate; 121. Through hole; 13. Spring; 2. Centrifugal block; 3. Hydraulic expansion clamp; 4. Hat-shaped flexible wheel. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. At the same time, the terms "first", "second", etc., are only used to distinguish the names of various components and do not have a primary or secondary relationship. Therefore, they should not be construed as limitations on this utility model.

[0023] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown;

[0024] This utility model discloses a clamping device for precision turning of a hat-shaped flexible wheel: it includes a retainer 1 installed on a hydraulic expansion clamp 3. The retainer 1 is arranged in a ring and its outer peripheral wall is evenly distributed with a number of receiving grooves 111. Each receiving groove 111 is movably connected to a centrifugal block 2. The outer end of the centrifugal block 2 can extend out of the receiving groove 111 to abut against the inner peripheral wall of the hat-shaped flexible wheel 4.

[0025] A spring 13 is also provided in the accommodating groove 111. One end of the spring 13 is connected to the inner bottom wall of the accommodating groove 111, and the other end is connected to the inner end of the centrifuge block 2. In the initial state, the outer end of the centrifuge block 2 is located in the accommodating groove 111.

[0026] During the turning of the cap-shaped flexible wheel 4, the cage 1 rotates synchronously with the hydraulic expansion clamp 3 on the lathe. Under the action of centrifugal force, the centrifugal block 2 overcomes the tension of the spring 13 and extends its outer end out of the receiving groove 111, abutting against the inner circumferential wall of the cap-shaped flexible wheel 4. As the speed of the drive shaft increases, the centrifugal force increases, and the clamping force of the centrifugal block 2 also increases, thus firmly holding the cap-shaped flexible wheel 4. This utility model compensates for the clamping force of the hydraulic expansion clamp 3 by using the centrifugal block 2, which can prevent the cap-shaped flexible wheel 4 from slipping during turning and eliminates the need to increase the clamping force through the hydraulic clamp 3, ensuring the stability of the product turning process. In addition, the centrifugal block 2 undergoes radial displacement (radial displacement 0.3-0.5mm) under the action of centrifugal force, and generates a counter-centrifugal force when it passively contacts the cap-shaped flexible wheel 4. This counteracts the cutting force fluctuation component, reduces the vibration caused by the thin-walled structure of the cap-shaped flexible wheel under high-speed rotation, thereby reducing tool wear and improving the machining accuracy and stability of the product. When the turning process is completed, the drive shaft stops rotating, the centrifugal force disappears, and the centrifugal block 2 resets under the elastic force of spring 13, automatically loosening its grip on the cap-shaped flexible wheel 4, making it easy to remove the product.

[0027] The outer end face of the centrifugal block 2 is arc-shaped, and when it comes into contact with the cap-shaped flexible wheel 4, the contact stress is evenly distributed, which can avoid local plastic deformation.

[0028] The cross-section of the receiving groove 111 is a trapezoid with a smaller outer diameter and a larger inner diameter; the centrifugal block 2 matches the shape of the receiving groove 111, and the width of the inner end of the centrifugal block 2 is greater than the size of the opening at the outer end of the receiving groove 111. This can prevent the centrifugal block 2 from coming out of the receiving groove 111 and can limit the distance the outer end of the centrifugal block 2 extends, thus preventing the cap-shaped flexible wheel 4 from being squeezed and deformed due to excessive centrifugal force.

[0029] like Figure 3 As shown, the retainer 1 includes a frame 11 and a cover plate 12; a receiving groove 111 is disposed on the frame 11, and one side wall of the groove is open; the cover plate 12 is connected to the side wall of the frame 11 and is used to partially cover the open end of the side wall of the receiving groove 111. The open end of one side wall of the receiving groove 111 facilitates the assembly of the centrifuge block 2. After the centrifuge block 2 is installed into the receiving groove 111, the cover plate 12 is used to cover the open end of the side wall of the receiving groove 111 to prevent the centrifuge block 2 from falling out.

[0030] The cover plate 12 has several through holes 121 evenly distributed around its circumference. The side wall of the frame 11 is provided with screw holes 112 corresponding to the through holes 121. Screws are provided in the through holes 121. The connecting end of the screw passes through the through hole 121 and connects with the corresponding screw hole 112 to fix the cover plate 12 to the frame 11.

[0031] The side wall of the frame 11 is provided with a recess 113 that matches the shape of the cover plate 12. The cover plate 12 is connected in the recess 113, and the outer side wall of the cover plate 12 is flush with the side wall of the frame 11.

[0032] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A clamping device for precision turning of a cap-shaped flexible wheel, characterized in that: Includes a retainer (1) mounted on a liquid expansion clamp (3). The retainer (1) is arranged in a ring and has several accommodating grooves (111) evenly distributed around its outer peripheral wall. A centrifugal block (2) is movably connected in each accommodating groove (111). The outer end of the centrifugal block (2) can extend out of the accommodating groove (111) to abut against the inner peripheral wall of the cap-shaped flexible wheel (4).

2. The clamping device for precision turning of a cap-shaped flexible wheel according to claim 1, characterized in that: A spring (13) is also provided in the accommodating groove (111). One end of the spring (13) is connected to the inner bottom wall of the accommodating groove (111), and the other end is connected to the inner end of the centrifugal block (2). In the initial state, the outer end of the centrifugal block (2) is located in the accommodating groove (111).

3. The clamping device for precision turning of a cap-shaped flexible wheel according to claim 2, characterized in that: The cross-section of the receiving groove (111) is a trapezoid with a smaller outer diameter and a larger inner diameter; the centrifugal block (2) matches the shape of the receiving groove (111), and the width of the inner end of the centrifugal block (2) is greater than the size of the opening at the outer end of the receiving groove (111).

4. A clamping device for precision turning of a cap-shaped flexible wheel according to claim 3, characterized in that: The retainer (1) includes a frame (11) and a cover plate (12); the receiving groove (111) is disposed on the frame (11) and one side wall of the receiving groove (111) is open; the cover plate (12) is connected to the side wall of the frame (11) and is used to partially cover the open end of the side wall of the receiving groove (111).

5. A clamping device for precision turning of a cap-shaped flexible wheel according to claim 4, characterized in that: The cover plate (12) has several through holes (121) evenly distributed around its circumference. The side wall of the frame (11) is provided with screw holes (112) corresponding to the through holes (121). Screws are provided in the through holes (121). The connecting end of the screw passes through the through hole (121) and connects with the corresponding screw hole (112) to fix the cover plate (12) to the frame (11).

6. A clamping device for precision turning of a cap-shaped flexible wheel according to claim 4, characterized in that: The side wall of the frame (11) is provided with a recess (113) that matches the shape of the cover plate (12). The cover plate (12) is connected in the recess (113), and the outer side wall of the cover plate (12) is flush with the side wall of the frame (11).

7. A clamping device for precision turning of a cap-shaped flexible wheel according to claim 1, characterized in that: The outer end face of the centrifugal block (2) is arc-shaped.

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