A hydraulic clamping drive device for an ultra-precision gear grinding machine

Abstract

This utility model discloses a hydraulic clamping drive device for an ultra-precision gear grinding machine, relating to the field of machining. It utilizes an alloy center point on a central column for pre-positioning of the workpiece, combined with a hydraulically driven elastic expansion sleeve that clamps the workpiece's inner hole through a uniform radial expansion force generated by the conical surface engagement. This ensures the coaxiality and positional accuracy of the workpiece after clamping, providing a reliable positioning basis for ultra-precision grinding. The hydraulic drive provides and maintains a large and stable clamping force. The elastic expansion sleeve provides relatively uniform radial clamping of the workpiece, avoiding stress concentration and workpiece deformation, ensuring clamping stability during high-speed grinding. The overall structure of the device is relatively compact. Through the ingenious combination of hydraulic drive and the elastic expansion sleeve, it effectively solves the positioning and driving problems existing in traditional clamping methods in high-precision, high-efficiency grinding processes, making it suitable for ultra-precision gear grinding applications with high requirements for clamping accuracy and stability.

Description

Technical Field

[0001] This utility model relates to the field of machining, and in particular to a hydraulic clamping drive device for an ultra-precision gear grinding machine. Background Technology

[0002] In modern mechanical manufacturing, the machining of high-precision gear components for gear transmissions requires extremely high precision in gear shape, necessitating specialized gear grinding machines. Gear grinding is a crucial process for improving gear precision, effectively correcting errors generated during pre-machining and eliminating heat treatment deformation, thereby enhancing gear machining accuracy. However, the gear clamping method and grinding technique have a vital impact on both grinding accuracy and machining efficiency.

[0003] Traditional clamping and driving methods using top-mounted centering mechanisms or conventional drive sleeves have played a crucial role in gear machining. However, with the continuous development of the manufacturing industry, the requirements for precision and efficiency in gear machining are becoming increasingly stringent, making these traditional clamping methods insufficient for the demands of high-efficiency, high-speed grinding. In high-efficiency, high-speed grinding processes, traditional clamping methods often suffer from inaccurate positioning and insufficient drive stability. These problems lead to a decrease in gear machining precision, affecting gear quality and performance.

[0004] Therefore, to meet the demands of modern manufacturing for high-precision gear machining, a simple-to-operate, stable-drive, and precisely positioned machining clamping device is needed. This new clamping device should possess the following characteristics: First, it needs to be able to quickly and accurately position and clamp the gear, ensuring its stability during machining; second, it needs to have high-precision transmission performance to guarantee the gear's rotational accuracy during grinding; finally, it also needs to have good adaptability and versatility, applicable to the machining of gears of different specifications and types. By adopting such a new clamping device, the accuracy and efficiency of gear grinding can be significantly improved, meeting the urgent needs of modern industry for high-precision gears. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a hydraulic clamping drive device for ultra-precision gear grinding machines, which can meet the requirements of high-precision positioning and stable drive under high-efficiency and high-speed grinding conditions.

[0006] To achieve the above objectives, this application discloses a hydraulic clamping drive device for an ultra-precision gear grinding machine, comprising a hydraulic chamber formed by a fixedly connected cylinder seat and cylinder cover. A central column extending into the hydraulic chamber is disposed at the center of the cylinder seat. An elastic expansion sleeve is disposed between the cylinder cover and the central column. The elastic expansion sleeve includes a conical section, a straight cylindrical section, and a piston section connected sequentially from top to bottom. The top of the cylinder cover is configured with a gradually expanding opening from bottom to top, which mates with the conical section. The straight cylindrical section passes between the cylinder cover and the central column. The piston section is disposed at the bottom of the hydraulic chamber. A first hydraulic oil passage and a second hydraulic oil passage penetrate the cylinder seat and cylinder cover and communicate with the hydraulic chamber. The inlet of the first hydraulic oil passage and the hydraulic chamber is disposed below the piston section, and the inlet of the second hydraulic oil passage and the hydraulic chamber is disposed above the piston section. An alloy tip is fixedly disposed on the central column.

[0007] Furthermore, the cylinder cover is fixed to the cylinder seat by bolts.

[0008] Furthermore, the cylinder cover is provided with openings that communicate with the first hydraulic circuit and the second hydraulic circuit, and the openings are sealed by sealing bolts.

[0009] Furthermore, hydraulic seals are provided between the cylinder head and the central column, between the cylinder head and the straight section, and between the piston section and the cylinder head.

[0010] Furthermore, the hydraulic seal is a rubber ring or a silicone ring.

[0011] Beneficial effects of the technical solution of this utility model

[0012] High positioning accuracy: The workpiece is pre-positioned using an alloy center on the central column, and the workpiece's inner hole is clamped by a uniform radial expansion force generated by the hydraulically driven elastic expansion sleeve through the conical surface. This ensures the coaxiality and positional accuracy of the workpiece after clamping, providing a reliable positioning basis for ultra-precision grinding.

[0013] Stable and reliable clamping with large driving force: The hydraulic drive can provide and maintain a large clamping force, and the clamping force is stable. The structure of the elastic expansion sleeve (5) enables it to generate a relatively uniform radial clamping of the workpiece, ensuring clamping stability during high-speed grinding.

[0014] High degree of automation and convenient operation: The workpiece can be automatically clamped and released by controlling the opening and closing of the hydraulic oil circuit, which simplifies the operation process, shortens the auxiliary time, and helps to improve the overall processing efficiency.

[0015] Reasonable structural design and good applicability: The overall structure of the device is relatively compact. Through the ingenious combination of hydraulic drive and elastic expansion sleeve, it effectively solves the positioning and driving problems of traditional clamping methods in high-precision and high-efficiency grinding. It is suitable for ultra-precision gear grinding applications with high requirements for clamping accuracy and stability. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the hydraulic clamping drive device for the ultra-precision gear grinding machine of this utility model;

[0018] Figure 2 This is a top view of the hydraulic clamping drive device for the ultra-precision gear grinding machine of this utility model;

[0019] Figure 3 This utility model Figure 2 A cross-sectional view at position AA in the middle;

[0020] Figure 4 This utility model Figure 2 A cross-sectional view at position BB in the middle;

[0021] Figure 5 This is a structural diagram of the present invention in use.

[0022] Among them: 100. workpiece, 200. equipment center, 300. grinding wheel, 1. cylinder seat, 2. cylinder cover, 3. hydraulic chamber, 4. center column, 5. elastic expansion sleeve, 51. tapered section, 52. straight section, 53. piston section, 6. first hydraulic oil circuit, 7. second hydraulic oil circuit, 8. alloy center, 9. bolt, 10. through port, 11. sealing bolt, 12. hydraulic seal, 21. gradually expanding opening. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please refer to the examples. Figure 1-5A hydraulic clamping drive device for an ultra-precision gear grinding machine, characterized in that: it includes a hydraulic chamber 3 formed by a fixedly connected cylinder seat 1 and cylinder cover 2; a central column 4 extending into the hydraulic chamber 3 is disposed at the center of the cylinder seat 1; an elastic expansion sleeve 5 is disposed between the cylinder cover 2 and the central column 4; the elastic expansion sleeve 5 includes a conical section 51, a straight section 52, and a piston section 53 connected sequentially from top to bottom; the top of the cylinder cover 2 is configured as a gradually expanding opening 21 from bottom to top; the gradually expanding opening 21 and the conical section 52... The straight cylindrical section 52 passes between the cylinder head 3 and the central column 4, and the piston section 53 is located at the bottom of the hydraulic chamber 3. The first hydraulic oil passage 6 and the second hydraulic oil passage 7 pass through the cylinder seat 1 and the cylinder head 2 and communicate with the hydraulic chamber 3. The inlet of the first hydraulic oil passage 6 and the hydraulic chamber 3 is located below the piston section 53, and the inlet of the second hydraulic oil passage 7 and the hydraulic chamber 3 is located above the piston section 53. An alloy tip 8 is fixedly installed on the central column 4.

[0025] When using, refer to Figure 5 Using this device in conjunction with the equipment center 200, the workpiece 100 is fixed, and then the grinding wheel 300 is used for grinding.

[0026] Clamping the workpiece: The external hydraulic system injects pressurized oil into the space below the piston section 53 in the hydraulic chamber 3 through the first hydraulic oil circuit 6. The pressurized oil acts on the lower end face of the piston section 53, pushing the piston section 53 and the entire elastic expansion sleeve 5 upward axially. As the elastic expansion sleeve 5 moves upward, its tapered section 51 is forced into the gradually expanding opening 21 of the cylinder head 2. Due to the taper fit between the inner tapered surface of the gradually expanding opening 21 and the outer tapered surface of the tapered section 51, the tapered section 51 is forced to expand radially while moving axially. This radial expansion is transmitted to the straight cylindrical section 52 integrated with it, increasing the outer diameter of the straight cylindrical section 52, thereby applying a uniform clamping force to the inner hole of the gear workpiece to be processed, which is sleeved on the outside, to achieve reliable clamping of the workpiece. In this process, the workpiece is first provided with precise axial and radial preliminary positioning by the alloy tip 8.

[0027] Releasing the workpiece: The external hydraulic system injects pressurized oil into the space above the piston section 53 in the hydraulic chamber 3 through the second hydraulic oil circuit 7, or depressurizes the first hydraulic oil circuit 6 and applies other forces downwards. The pressurized oil acts on the upper end face of the piston section 53, pushing the piston section 53 and the entire elastic expansion sleeve 5 downwards axially. As the elastic expansion sleeve 5 moves downwards, its tapered section 51 gradually disengages from the clamping effect of the gradually expanding opening 21 of the cylinder head 2. Under the action of the elasticity of the elastic expansion sleeve 5 itself, the tapered section 51 and the straight section 52 return to their initial smaller diameter state, thereby releasing the clamping force on the inner hole of the workpiece, and the workpiece can be removed.

[0028] Furthermore, the cylinder cover 2 is fixed to the cylinder seat 1 by bolts 9.

[0029] Furthermore, the cylinder cover 2 is provided with a port 10 that communicates with the first hydraulic oil circuit 6 and the second hydraulic oil circuit 7, and the port 10 is sealed by a sealing bolt 11.

[0030] Furthermore, hydraulic seals 12 are provided between the cylinder head 2 and the central column 4, between the cylinder head and the straight cylinder section 52, and between the piston section 53 and the cylinder head 2.

[0031] Furthermore, the hydraulic seal is a rubber ring or a silicone ring.

[0032] 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. An ultra-precision gear grinding machine hydraulic clamping driving device, characterized in that: The hydraulic chamber (3) is formed by a fixedly connected cylinder seat (1) and cylinder cover (2). A central column (4) extending into the hydraulic chamber (3) is provided at the center of the cylinder seat (1). An elastic expansion sleeve (5) is provided between the cylinder cover (2) and the central column (4). The elastic expansion sleeve (5) includes a conical section (51), a straight section (52), and a piston section (53) connected from top to bottom. The top of the cylinder cover (2) is provided with a gradually expanding opening (21) from bottom to top. The gradually expanding opening (21) cooperates with the conical section (51). The straight section (52) is connected from bottom to top. 52) The piston section (53) is located at the bottom of the hydraulic chamber (3) between the cylinder head (3) and the central column (4). The first hydraulic oil circuit (6) and the second hydraulic oil circuit (7) pass through the cylinder seat (1) and the cylinder head (2) and communicate with the hydraulic chamber (3). The inlet of the first hydraulic oil circuit (6) and the hydraulic chamber (3) is located below the piston section (53). The inlet of the second hydraulic oil circuit (7) and the hydraulic chamber (3) is located above the piston section (53). An alloy tip (8) is fixedly installed on the central column (4).

2. The hydraulic clamping drive device of an ultra-precision gear grinding machine according to claim 1, characterized in that: The cylinder cover (2) is fixed to the cylinder seat (1) by bolts (9).

3. The hydraulic clamping drive device of the ultra-precision gear grinding machine according to claim 1, wherein: The cylinder cover (2) is provided with a port (10) that communicates with the first hydraulic oil circuit (6) and the second hydraulic oil circuit (7), and the port (10) is sealed by a sealing bolt (11).

4. The hydraulic clamping drive device of the ultra-precision gear grinding machine according to claim 1, characterized in that: Hydraulic seals (12) are provided between the cylinder head (2) and the central column (4), between the cylinder head and the straight section (52), and between the piston section (53) and the cylinder head (2).

5. The hydraulic clamping drive of an ultra-precision gear grinding machine according to claim 4, characterized in that: The hydraulic seals are rubber rings and silicone rings.

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