A separable multi-dimensional ultrasonic vibration platform based on a flexible hinge structure

Abstract

The application relates to a detachable multi-dimensional ultrasonic vibration platform based on a flexible hinge structure, which comprises a supporting base, a one-dimensional vibration platform, a two-dimensional vibration platform, a three-dimensional vibration platform, a packaged columnar piezoelectric ceramic actuator, a pre-tightening module, a pre-tightening bolt and a bolt; the bottom of the supporting base is fixed on a machine tool; the one-dimensional vibration platform, the two-dimensional vibration platform or the three-dimensional vibration platform is fixed in a platform mounting position in the supporting base through the bolt in a replaceable mode; the vibration platform fixed in the platform mounting position is powered by two piezoelectric ceramic actuators arranged perpendicularly to each other, so that multi-dimensional vibration movement of the platform is realized; the two packaged columnar piezoelectric ceramic actuators are provided with pre-tightening force by the pre-tightening bolts, and the pre-tightening bolts are connected to the supporting base through threads; the pre-tightening module is arranged between the two packaged columnar piezoelectric ceramic actuators and the corresponding pre-tightening bolts, and is used for preventing the packaged columnar piezoelectric ceramic actuators from being deflected.

Description

Technical Field

[0001] This invention belongs to the field of special processing technology, specifically relating to a separable multidimensional ultrasonic vibration platform based on a flexible hinge structure. Background Technology

[0002] In recent years, vibration-assisted milling technology has attracted much attention due to its unique machining characteristics. By applying controllable vibration, cutting forces can be reduced, surface quality improved, and heat dissipation promoted. Vibration-assisted milling has shown significant advantages, especially in the machining of micro / nano functional surfaces. However, this application places higher demands on machining accuracy; even minute errors can lead to changes in surface texture, posing a significant challenge to vibration-assisted systems.

[0003] Currently, according to existing research, vibration-assisted milling technology typically achieves this by applying high-frequency vibrations to the cutting tool or workpiece. However, applying vibrations to a high-speed rotating milling cutter during milling can easily disrupt its stability. Therefore, a vibration-assisted platform is designed to provide high-frequency vibrations to the workpiece during milling. Depending on the vibration dimension, vibration-assisted milling can be categorized into one-dimensional, two-dimensional, and three-dimensional vibrations for creating different functional textures. Correspondingly, one-dimensional, two-dimensional, and three-dimensional flexible worktables exist to enable machining of workpieces under different vibrational motions. However, existing flexible platforms are typically integrated designs, meaning they can only provide a single type of vibration and performance. Therefore, achieving effective vibration while meeting diverse needs is quite challenging. One-dimensional platforms have lower coupling errors in one-dimensional vibrational motion but cannot achieve two-dimensional and three-dimensional vibrations. Three-dimensional platforms can simultaneously achieve one-dimensional, two-dimensional, and three-dimensional vibrations, but they exhibit significant coupling errors in one-dimensional and two-dimensional vibrational motions. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a separable multidimensional ultrasonic vibration auxiliary platform based on flexible hinges that can realize the free replacement of the central vibration platform, thereby enabling the provision of the required high-precision vibration motion according to specific work requirements.

[0005] The above-mentioned objective of this invention is achieved through the following technical solution:

[0006] A separable multidimensional ultrasonic vibration platform based on a flexible hinge structure is characterized by comprising a support base, a one-dimensional vibration platform, a two-dimensional vibration platform, a three-dimensional vibration platform, an encapsulated columnar piezoelectric ceramic actuator, a pre-tightening module, a pre-tightening bolt, and bolts; the bottom of the support base is fixed to a machine tool; the one-dimensional, two-dimensional, or three-dimensional vibration platform is optionally and replaceably fixed to a platform mounting position within the support base by the bolts; the vibration platform fixed to the platform mounting position is powered by two mutually perpendicularly arranged piezoelectric ceramics to achieve multidimensional vibration motion of the platform; both encapsulated columnar piezoelectric ceramic actuators are pre-tightened by the pre-tightening bolts, which are threadedly connected to the support base; a pre-tightening module is provided between each of the two encapsulated columnar piezoelectric ceramic actuators and the corresponding pre-tightening bolt to prevent the encapsulated columnar piezoelectric ceramic actuators from tilting.

[0007] Furthermore, the one-dimensional vibration platform includes an inner layer and an outer layer surrounding the inner layer. The inner layer is a worktable. The outer layer is equipped with a parallel structure of double-rounded straight beam flexible hinges in the vibration direction to provide flexibility. The outer layer is also equipped with rigid beams in the direction perpendicular to the vibration direction to provide sufficient stiffness and reduce coupling errors. The inner layer is connected to the outer layer in the vibration direction via a single-rounded straight beam flexible hinge structure to provide flexibility. The inner layer is also connected to the outer layer in the direction perpendicular to the vibration direction via rigid beams to provide sufficient stiffness and reduce coupling errors.

[0008] Furthermore: the two-dimensional vibration platform includes an inner layer and an outer layer disposed around the inner layer, the inner layer being a worktable; the outer layer has parallel parallel structures of rounded-corner straight beam flexible hinges evenly distributed in both vibration directions of the plane, providing flexibility and reducing coupling error; the inner layer structure is connected to the outer layer in both vibration directions through a single rounded-corner straight beam flexible hinge structure, providing flexibility; the outer and inner layers are centrally symmetrically arranged, which can reduce coupling error.

[0009] Furthermore, the three-dimensional vibration platform is divided into an inner layer and an outer layer surrounding the inner layer. The inner layer serves as a worktable. The outer layer is equipped with parallel, rounded-corner straight-beam flexible hinge structures evenly distributed in both vibration directions of the plane, providing flexibility and reducing coupling errors. The inner layer structure is connected to the outer layer at a 45° angle to the vibration direction via arc hinges, converting planar motion into spatial motion. The outer and inner layers are centrally symmetrical, which can reduce coupling errors.

[0010] Furthermore: the pre-tightening module has an inner groove on its front side, which is fixed to the end of the corresponding encapsulated columnar piezoelectric ceramic actuator, allowing the encapsulated columnar piezoelectric ceramic actuator to provide vibration displacement in the direction of the vertical platform; the pre-tightening module has an outer groove on its back side; the pre-tightening bolt is threaded onto the side wall of the support base; the end of the pre-tightening bolt extends into the support base and makes close contact with the outer groove of the pre-tightening module, providing pressure to the pre-tightening module, and the pre-tightening module directly provides pre-tightening force to the encapsulated columnar piezoelectric ceramic actuator.

[0011] Furthermore, the encapsulated cylindrical piezoelectric ceramic actuator is supplied with voltage by a piezoelectric ceramic controller, and the vibration amplitude and frequency of the vibration platform fixed at the platform mounting position are adjusted by regulating the output power and frequency of the piezoelectric ceramic controller.

[0012] The advantages and positive effects of this invention are as follows:

[0013] 1. The vibration platform of this invention is based on a separable design, enabling free replacement of different self-dimensional platforms. Equipped with a one-dimensional vibration platform, a two-dimensional vibration platform, and a three-dimensional vibration platform, it can respectively achieve high-precision one-dimensional, two-dimensional, and three-dimensional vibration.

[0014] 2. This invention designs a separable multidimensional ultrasonic vibration platform based on a flexible hinge structure, thus avoiding the need to modify the spindle.

[0015] 3. All three platforms of this invention adopt an inner and outer layer structure design. The outer layer adopts a parallel structure of double rounded corner straight beam flexible hinges, so that the central vibrating block maintains stable reciprocating characteristics during vibration.

[0016] 4. The inner and outer layers of the one-dimensional vibration platform of this invention adopt a parallel structure of double rounded corner straight beam flexible hinges as flexible units in the vibration direction. This structure itself has the function of reducing coupling error in the vertical vibration direction. The rigid beams used in the vertical vibration direction have high stiffness characteristics, which further suppresses the coupling error in this direction during the processing and realizes high-precision one-dimensional vibration assistance.

[0017] 5. The two-dimensional and three-dimensional platform peripheral structures of this invention adopt a parallel structure of double rounded corner straight beam flexible hinges as flexible units, which itself has the function of reducing coupling error in the vertical vibration direction. The overall symmetrical structure design further reduces coupling error, enabling high-precision two-dimensional and three-dimensional motion.

[0018] 6. The inner structure of the three-dimensional platform of the present invention uses arc hinges arranged at a 45° angle to the vibration direction to convert planar motion into spatial motion, and enables the central worktable to only perform translational motion, avoiding angular deflection.

[0019] 7. In all three platform structures of this invention, rounded corner straight beam flexible hinges are used as basic units to avoid stress concentration. Attached Figure Description

[0020] Figure 1 : A three-dimensional structural diagram of the separable multidimensional ultrasonic vibration processing platform based on flexible hinges of the present invention;

[0021] Figure 2 : A schematic diagram of the one-dimensional vibration platform of the separable multidimensional ultrasonic vibration processing platform based on flexible hinge of the present invention;

[0022] Figure 3 : A schematic diagram of the two-dimensional vibration platform of the separable multidimensional ultrasonic vibration processing platform based on flexible hinge of the present invention;

[0023] Figure 4 : A schematic diagram of the three-dimensional vibration platform of the separable multidimensional ultrasonic vibration processing platform based on flexible hinges of the present invention. Detailed Implementation

[0024] The structure of the present invention will be further described below with reference to the accompanying drawings and embodiments. It should be noted that these embodiments are descriptive and not limiting.

[0025] As attached Figures 1 to 4 As shown, a separable multidimensional two-dimensional ultrasonic vibration platform based on a flexible hinge structure is disclosed. The vibration platform includes a support base 1, a one-dimensional vibration platform 2, a two-dimensional vibration platform 3, a three-dimensional vibration platform 4, and an encapsulated columnar piezoelectric ceramic actuator 5.

[0026] The bottom of the support base 1 is directly fixed to the machine tool with bolts. The support base contains a platform mounting position and two actuator mounting positions. The two actuator mounting positions are located on adjacent sides of the platform mounting position and are vertically aligned. The four corners of the platform mounting positions inside the support base 1 are connected to the one-dimensional vibration platform 2, two-dimensional vibration platform 3, or three-dimensional vibration platform 4 via screws 8, for supporting and fixing the one-dimensional vibration platform 2, two-dimensional vibration platform 3, or three-dimensional vibration platform 4. The support base 1 is detachable from the one-dimensional vibration platform 2, two-dimensional vibration platform 3, or three-dimensional vibration platform 4 and can be replaced according to different processing requirements, making it suitable for different processing applications.

[0027] The one-dimensional vibration platform adopts an internal and external structural design, specifically including: a centrally located worktable 2-7, four fixing blocks 2-4 for fixing, two motion blocks 2-1 for transmitting motion, two inner single-rounded corner straight beam flexible hinges 2-6, two inner rigid beam structures 2-5, four outer double-rounded corner straight beam flexible hinge parallel structures 2-2, two outer rigid beam structures 2-3, and twenty threaded through holes 2-8 for fixing the workpiece. When the separable multi-dimensional two-dimensional ultrasonic vibration platform based on the flexible hinge structure is mounted on the one-dimensional vibration platform 2, the four fixing blocks 2-4 are respectively fixed to the four corners of the internal platform mounting position of the support base 1 by screws 8 and are in close contact with the support base 1, thus playing a fixing role. The worktable 2-7 is located at the internal center of the support base 1. The worktable 2-7 is connected to the two peripheral rigid beam structures 2-3 via two single-rounded straight beam flexible hinges 2-6 in the vibration direction. Each moving block 2-1 has a parallel structure 2-2 of peripheral double-rounded straight beam flexible hinges on both sides. One end of each parallel structure 2-2 is fixedly connected to the moving block 2-1, and the other end is fixedly connected to the corresponding fixed block 2-4. The moving block 2-1 is connected to the worktable 2-7 via an inner rigid beam structure 2-5, thereby improving stiffness in the vertical vibration direction. One of the two moving blocks 2-1 is connected to an encapsulated columnar piezoelectric ceramic actuator 5 located in the same direction, enabling high-precision single-degree-of-freedom movement of the worktable 2-7.

[0028] The two-dimensional vibration platform adopts an internal and external structural design, specifically including a centrally located worktable 3-5, four fixing blocks 3-3 for fixing, four motion blocks 3-1 for transmitting motion, four inner single-rounded straight beam flexible hinges 3-4, eight outer double-rounded straight beam flexible hinges in parallel connection 3-2, and twenty threaded through holes 3-6 for fixing the workpiece. When the separable multi-dimensional two-dimensional ultrasonic vibration platform based on the flexible hinge structure is mounted on the two-dimensional vibration platform 3, the four fixing blocks 3-3 are respectively fixed to the four corners of the internal platform mounting position of the support base 1 by screws 8 and are in close contact with the support base 1, thus playing a fixing role. The worktable 3-5 is located at the internal center of the support base 1. The worktable 3-5 is connected to four moving blocks 3-1 via four single-rounded straight beam flexible hinges 3-4. Each moving block 3-1 has a parallel structure 3-2 of outer double-rounded straight beam flexible hinges on both sides. One end of each parallel structure 3-2 is fixedly connected to the moving block 3-1, and the other end is fixedly connected to the corresponding fixed block 3-3, which in turn is fixedly connected to the support base 1. Two adjacent moving blocks 3-1 are connected to two piezoelectric ceramic drive structures 5 located in the same horizontal plane and arranged perpendicularly to each other, enabling high-precision two-degree-of-freedom movement of the worktable 3-5.

[0029] The three-dimensional vibration platform adopts an internal and external structural design, specifically including: a centrally located worktable 4-4, four fixing blocks 4-3 for fixing, four motion blocks 4-1 for transmitting motion, eight inner Z-shaped hinges 4-5, four arc-shaped flexible hinges 4-6, eight parallel structures of outer double-rounded straight beam flexible hinges 4-2, and eight threaded through holes 4-7 for fixing the workpiece. When the separable multi-dimensional two-dimensional ultrasonic vibration platform based on the flexible hinge structure is mounted on the three-dimensional vibration platform 4, the four fixing blocks 4-3 are respectively fixed to the four corners of the internal platform mounting position of the support base 1 by screws 8 and are in close contact with the support base 1, thus playing a fixing role. The worktable 4-4 is located at the inner center of the support base 1. The worktable 4-4 is connected to eight inner Z-shaped hinges 4-5 via four arc-shaped flexible hinges 4-6. The other end of each Z-shaped hinge is connected to a moving block 4-1. Each moving block 4-1 has a parallel structure 4-2 of outer double-rounded straight beam flexible hinges on both sides. One end of each parallel structure 4-2 is fixedly connected to the moving block 4-1, and the other end is fixedly connected to a corresponding fixed block 4-3, which in turn is fixedly connected to the support base 1. Two adjacent moving blocks 4-1 are connected to two piezoelectric ceramic drive structures 5 arranged perpendicularly to each other in the same horizontal plane, enabling high-precision three-degree-of-freedom motion of the worktable 4-4.

[0030] Two encapsulated cylindrical piezoelectric ceramic actuators are respectively installed in two actuator mounting positions. The output end of the encapsulated cylindrical piezoelectric ceramic actuator 5 is in close contact with the moving block of the one-dimensional vibration platform 2, two-dimensional vibration platform 3, or three-dimensional vibration platform 4. A pre-tightening force is provided to the encapsulated cylindrical piezoelectric ceramic actuator 5 through a pre-tightening mechanism. The pre-tightening mechanism includes a pre-tightening module 6 and a pre-tightening bolt 7. The front of the pre-tightening module 6 has a groove for fixing the end of the encapsulated cylindrical piezoelectric ceramic actuator 5, thereby allowing the encapsulated cylindrical piezoelectric ceramic actuator 5 to provide vibration displacement in the direction perpendicular to the platform. The back of the pre-tightening module 6 also has a groove for fixing the end of the pre-tightening bolt 7. The pre-tightening bolt 7 is threaded onto the side wall of the support base 1. The end of the pre-tightening bolt 7 extends into the support base 1, making close contact with the pre-tightening module 6 and providing pressure to the pre-tightening module 6. The pre-tightening module 6 directly provides the pre-tightening force to the encapsulated cylindrical piezoelectric ceramic actuator 5.

[0031] The encapsulated cylindrical piezoelectric ceramic actuator 5 is supplied with voltage by a piezoelectric ceramic controller, which converts the electrical signal into a vibration displacement signal and transmits it to the one-dimensional vibration platform 2, two-dimensional vibration platform 3, or three-dimensional vibration platform 4, causing the central worktable of the one-dimensional vibration platform 2, two-dimensional vibration platform 3, or three-dimensional vibration platform 4 to undergo high-frequency mechanical vibration. The amplitude and frequency of the central worktable's vibration can be adjusted by regulating the input power and frequency of the piezoelectric ceramic controller.

[0032] Although embodiments and drawings of the present invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A separable multidimensional ultrasonic vibration platform based on a flexible hinge structure, characterized in that: The system includes a support base (1), a one-dimensional vibration platform (2), a two-dimensional vibration platform (3), a three-dimensional vibration platform (4), an encapsulated columnar piezoelectric ceramic actuator (5), a pre-tightening module (6), a pre-tightening bolt (7), and a bolt (8). The bottom of the support base (1) is fixed to the machine tool. The one-dimensional vibration platform (2), two-dimensional vibration platform (3), or three-dimensional vibration platform (4) is fixed to the platform mounting position in the support base (1) by the bolt (8) in an optional replacement manner. The vibration platform fixed to the platform mounting position is powered by two encapsulated columnar piezoelectric ceramic actuators (5) arranged perpendicularly to each other to realize the multi-dimensional vibration motion of the platform. The two encapsulated columnar piezoelectric ceramic actuators (5) are both provided with pre-tightening force by the pre-tightening bolt (7), and the pre-tightening bolt is connected to the support base by threads. A pre-tightening module is provided between the two encapsulated columnar piezoelectric ceramic actuators and the corresponding pre-tightening bolts to prevent the encapsulated columnar piezoelectric ceramic actuators (5) from deflecting. The one-dimensional vibration platform (2) includes an inner layer and an outer layer disposed around the inner layer. The inner layer of the one-dimensional vibration platform is a worktable. The outer layer of the one-dimensional vibration platform is provided with a parallel structure of double rounded corner straight beam flexible hinges in the vibration direction. The outer layer of the one-dimensional vibration platform is provided with a rigid beam in the vertical vibration direction. The inner layer of the one-dimensional vibration platform is connected to the outer layer of the one-dimensional vibration platform in the vibration direction through a single rounded corner straight beam flexible hinge structure. The inner layer of the one-dimensional vibration platform is connected to the outer layer of the one-dimensional vibration platform in the vertical vibration direction through a rigid beam. The two-dimensional vibration platform (3) includes an inner layer and an outer layer disposed around the inner layer. The inner layer of the two-dimensional vibration platform is a worktable. The outer layer of the two-dimensional vibration platform is provided with a parallel structure of double rounded corner straight beam flexible hinges evenly distributed in both vibration directions. The inner layer of the two-dimensional vibration platform is connected to the outer layer of the two-dimensional vibration platform in both vibration directions through a single rounded corner straight beam flexible hinge structure. The outer and inner layers of the two-dimensional vibration platform are arranged in a centrally symmetrical manner. The three-dimensional vibration platform (4) is divided into an inner layer and an outer layer. The inner layer of the three-dimensional vibration platform is a worktable. The outer layer of the three-dimensional vibration platform is provided with a parallel structure of double rounded corner straight beam flexible hinges evenly distributed in both vibration directions of the plane. The inner layer of the three-dimensional vibration platform is connected to the outer layer of the three-dimensional vibration platform at a 45° angle to the vibration direction through a circular arc hinge, which converts the planar motion into spatial motion. The outer and inner layers of the three-dimensional vibration platform are centrally symmetrical.

2. The separable multidimensional ultrasonic vibration platform based on a flexible hinge structure according to claim 1, characterized in that: The pre-tightening module (6) has an inner groove on its front side, which is fixed to the end of the corresponding encapsulated columnar piezoelectric ceramic actuator (5) through the inner groove, so that the encapsulated columnar piezoelectric ceramic actuator (5) provides vibration displacement in the direction of the vertical platform; the pre-tightening module (6) has an outer groove on its back side; the pre-tightening bolt (7) is threaded to the side wall of the support base (1); the end of the pre-tightening bolt (7) extends into the support base (1) and makes close contact with the outer groove of the pre-tightening module (6) and provides pressure to the pre-tightening module (6), so that the pre-tightening module (6) directly provides pre-tightening force to the encapsulated columnar piezoelectric ceramic actuator (5).

3. The separable multidimensional ultrasonic vibration platform based on a flexible hinge structure according to claim 1, characterized in that: The encapsulated columnar piezoelectric ceramic actuator (5) is supplied with voltage by a piezoelectric ceramic controller. The vibration amplitude and frequency of the vibration platform fixed at the platform mounting position are adjusted by adjusting the output power and frequency of the piezoelectric ceramic controller.

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