Turning device with flexible hinge

Abstract

The present invention provides a turning device with a flexible hinge, comprising a tool holder, a tool groove located at the front end of the tool holder and recessed inward from the upper surface of the tool holder, a tool body placed in the tool groove, a first piezoelectric ceramic stack and a second piezoelectric ceramic stack, the tool holder comprises an upper frame body and a lower frame body arranged up and down, the upper frame body comprises an upper frame body front end and an upper frame body rear end, the lower frame body comprises a lower frame body front end and a lower frame body rear end, the upper frame body rear end and the lower frame body rear end are integrally formed, the upper frame body front end and the lower frame body front end are connected by a first flexible hinge, the first piezoelectric ceramic stack is arranged between the front end of the lower frame body and the front end of the upper frame body, the upper frame body front end and the upper frame body rear end are connected by a second flexible hinge, and the second piezoelectric ceramic stack is arranged between the front end of the upper frame body and the rear end of the upper frame body. The turning device with a flexible hinge of the present invention has high positioning accuracy, fast response speed and acceleration, and can adjust the vibration effect and system rigidity to optimal performance.

Description

Technical Field

[0001] The invention relates to a turning device with a flexible hinge. Background Art

[0002] In order to obtain a large vibration amplitude, traditional ultrasonic vibration-assisted processing equipment adopts a design of adding a horn, which makes the resonant frequency the same as the external vibration frequency and puts it in a resonant state, thereby amplifying the amplitude of the transducer. However, the addition of the horn brings the following two limitations to the design:

[0003] 1. As the propagation medium of mechanical waves, the energy passing through any interface of the horn is fixed, so the energy density will change with the area of ​​the cross section. Therefore, the energy density at the output end with a smaller cross-sectional area is greater than that at the input end with a larger cross-sectional area, thereby amplifying the amplitude. Therefore, the horn occupies a relatively large volume in the entire ultrasonic vibration system, which limits its universal applicability on various types of machine tools.

[0004] 2. In the ultrasonic vibration system, the fixing method of the horn has a great influence on the overall performance. If the horn is over-constrained, it may limit its vibration amplitude and affect the vibration effect after conversion. If the horn is under-constrained, it may cause the entire system to be insufficiently rigid and unable to meet work requirements.

[0005] In view of this, it is necessary to improve the existing turning device to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to provide a turning device with a flexible hinge to solve the existing

[0007] To achieve the above-mentioned objectives, the present invention provides a turning device with a flexible hinge, the turning device with a flexible hinge comprising a tool holder, a tool groove located at the front end of the tool holder and recessed inward from the upper surface of the tool holder, a tool body placed in the tool groove, a first piezoelectric ceramic stack and a second piezoelectric ceramic stack, the tool holder comprising an upper frame body and a lower frame body arranged up and down, the upper frame body comprising an upper frame body front end and an upper frame body rear end, the lower frame body comprising a lower frame body front end and a lower frame body rear end, the upper frame body rear end and the lower frame body rear end are integrally formed, the upper frame body front end and the lower frame body front end are connected by a first flexible hinge, the first piezoelectric ceramic stack is arranged between the front end of the lower frame body and the front end of the upper frame body, the upper frame body front end and the upper frame body rear end are connected by a second flexible hinge, and the second piezoelectric ceramic stack is arranged between the front end of the upper frame body and the rear end of the upper frame body.

[0008] As a further improvement of the present invention, the first piezoelectric ceramic stack is arranged in front of the first flexible hinge.

[0009] As a further improvement of the present invention, the front end of the lower frame is hollowed out from top to bottom to form a first receiving groove, and the first piezoelectric ceramic stack is located in the first receiving groove, fixed to the lower frame, and abutted against the upper frame.

[0010] As a further improvement of the present invention, the turning device with a flexible hinge also includes a first baffle and a first position sensor, the first baffle is fixed on the upper frame, and the first position sensor is fixed on the lower frame to detect the displacement of the first baffle relative to the lower frame.

[0011] As a further improvement of the present invention, a first fixing screw is disposed on the lower frame, and the first fixing screw penetrates upward from the bottom of the lower frame to the first receiving groove to fix the first piezoelectric ceramic stack.

[0012] As a further improvement of the present invention, the front end of the upper frame body and the front end of the lower frame body are spaced apart in the vertical direction.

[0013] As a further improvement of the present invention, two connecting members are provided between the front end of the upper frame and the rear end of the upper frame, a second receiving groove is provided between the two connecting members, and the second piezoelectric ceramic stack is arranged in the second receiving groove to abut against the front end of the upper frame and the rear end of the upper frame.

[0014] As a further improvement of the present invention, the number of the second flexible hinges is two, and the two second flexible hinges are arranged at the connection between the two connecting members and the front end of the upper frame body.

[0015] As a further improvement of the present invention, the turning device with a flexible hinge also includes a second baffle and a second position sensor, the second baffle is fixed at the front end of the upper frame, and the second position sensor is fixed at the rear end of the upper frame or on the connecting member to detect the displacement of the second baffle relative to the rear end of the upper frame.

[0016] As a further improvement of the present invention, a second fixing screw is provided on the upper frame, and the second fixing screw penetrates from the rear end of the upper frame toward the front end of the upper frame to the second receiving groove to fix the second piezoelectric ceramic stack.

[0017] The beneficial effects of the present invention are: the turning device with a flexible hinge of the present invention has high positioning accuracy, fast response speed and acceleration, and the compact structural design also greatly improves its universal applicability in different machine tools and equipment. In addition, because a flexible hinge is used to replace the amplitude rod design, the present invention can adjust the vibration effect and system rigidity to the optimal performance at the same time compared to traditional vibration-assisted processing equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of a turning device with a flexible hinge of the present invention;

[0019] Figure 2 It is a schematic structural diagram of a tool holder of a turning device with a flexible hinge according to the present invention;

[0020] Figure 3 It is a schematic diagram of the side structure of the turning device with a flexible hinge of the present invention. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figures 1 to 3 As shown, the turning device 100 with a flexible hinge of the present invention includes a tool holder 1, a tool groove 2 located at the front end of the tool holder 1 and recessed inward from the upper surface of the tool holder 1, a tool body 3 placed in the tool groove 2, a first piezoelectric ceramic stack 4, a second piezoelectric ceramic stack 5, a first baffle 6, a first position sensor 7, a second baffle 8 and a second position sensor 9.

[0023] The tool holder 1 includes an upper frame 11 and a lower frame 12 arranged in a vertical direction, wherein the upper frame 11 includes an upper frame front end 111 and an upper frame rear end 112, and the lower frame 12 includes a lower frame front end 121 and a lower frame rear end 122. The upper frame rear end 112 and the lower frame rear end 122 are integrally formed, and the upper frame front end 111 and the lower frame front end 121 are connected by a first flexible hinge 13, and the upper frame front end 111 and the front end of the lower frame 12 are spaced apart in the vertical direction.

[0024] The cutter body 3 is fixed in the cutter groove 2 by fastening bolts 15. The cutter groove 2 and the cutter body 3 are both arranged in a rhombus shape, and the cutter body 3 can be made of natural single crystal diamond cutters, polycrystalline diamond cutters, or CBN and cemented carbide cutters according to processing requirements.

[0025] The first piezoelectric ceramic stack 4 is disposed between the front end of the lower frame 12 and the front end 111 of the upper frame. The first piezoelectric ceramic stack 4 is disposed in front of the first flexible hinge 13. In this embodiment, the front is a direction relatively close to the front end 121 of the lower frame.

[0026] The front end 121 of the lower frame is hollowed out from top to bottom to form a first receiving groove 123. The first piezoelectric ceramic stack 4 is located in the first receiving groove 123, fixed to the lower frame 12, and abutted against the upper frame 11. The first piezoelectric ceramic stack 4 serves as a vibration source, and the first flexible hinge 13 amplifies the generated displacement and transmits it to the blade 3, controlling the up and down movement of the blade 3.

[0027] The first baffle 6 is fixed on the upper frame 11, and the first position sensor 7 is fixed on the lower frame 12 to detect the displacement of the first baffle 6 relative to the lower frame 12. The first position sensor 7 is arranged on the lower side of the first baffle 6 and on one side of the lower frame 12.

[0028] A first fixing screw 123 is disposed on the lower frame 12 . The first fixing screw 123 penetrates upward from the bottom of the lower frame 12 to the first receiving groove 123 to fix the first piezoelectric ceramic stack 4 .

[0029] The upper frame front end 111 and the upper frame rear end 112 are connected via a second flexible hinge 14 , and the second piezoelectric ceramic stack 5 is disposed between the upper frame front end 111 and the upper frame rear end 112 .

[0030] In this embodiment, two connecting members 114 are provided between the front end 111 of the upper frame and the rear end 112 of the upper frame, and a second receiving groove 113 is provided between the two connecting members 114. The second piezoelectric ceramic stack 5 is arranged in the second receiving groove 113, and abuts against the front end 111 of the upper frame and the rear end 112 of the upper frame. There are two second flexible hinges 14, and two second flexible hinges 14 are arranged at the connection between the two connecting members 114 and the front end 111 of the upper frame. That is, the second piezoelectric ceramic stack 5 is arranged between the two connecting members 114, the front end 111 of the upper frame, and the rear end 112 of the upper frame.

[0031] The upper frame 11 is provided with a second fixing screw, which penetrates from the rear end 112 of the upper frame toward the front end 111 of the upper frame to the second receiving groove 113 to fix the first piezoelectric ceramic stack 4. In this embodiment, when the second piezoelectric ceramic stack 5 is working, the second piezoelectric ceramic stack 5 acts as a vibration source to drive the front end 111 of the upper frame to move forward and backward from the second flexible hinges 14 at both ends, and the displacement generated is amplified and transmitted to the blade 3 through the second flexible hinge 14.

[0032] The second baffle 8 is fixed to the front end 111 of the upper frame, and the second position sensor 9 is fixed to the rear end 112 of the upper frame or the connecting member 114 to detect the displacement of the second baffle 8 relative to the rear end 112 of the upper frame. In this embodiment, the second position sensor 9 is arranged above the second piezoelectric ceramic stack 5.

[0033] In this embodiment, the first flexible hinge 13 and the second flexible hinge 14 are circular flexible hinges, which are often used in situations where rotational displacement output is required due to their large rotation range, and are mainly used to eliminate the coupling phenomenon between the two motion axes, as a decoupling part. The two piezoelectric ceramics are stacked, and the blade 3 is driven to move through the high-precision rotational displacement output of the flexible hinge.

[0034] The first piezoelectric ceramic stack 4 and the second piezoelectric ceramic stack 5 are arranged at 90 degrees, which is a parallel driving mode. By inputting a harmonic signal with a certain phase difference into the first piezoelectric ceramic stack 4 and the second piezoelectric ceramic stack 5, the blade 3 vibrates along an elliptical trajectory. In the working state, the blade 3 has a vibration frequency f, and the two piezoelectric ceramic stacks respectively generate a large stroke displacement a and a small stroke displacement b. In the xy coordinate, the relative position of the blade 3 can be expressed as, x (t) =V t +acos(2πft),y (t) =bsin(2πft). The vibration frequency of the blade body 3 is preferably 40 kHz to 60 kHz, and the working stroke is 2 um to 3 um.

[0035] In other embodiments, a connecting piece and two flexible hinges may be provided between the upper frame and the lower frame, and a flexible hinge may be provided at the front end of the upper frame and the rear end of the upper frame.

[0036] The turning device 100 with a flexible hinge of the present invention adopts a design that combines the flexible hinge and the tool holder 1 as a transfer beam, amplifies the displacement generated by the piezoelectric ceramic stack vibration source and outputs it to the tool body 3, and decouples it through a straight circular flexible hinge. The turning device 100 with a flexible hinge of the present invention has high positioning accuracy, fast response speed and acceleration, and its compact structural design greatly improves its universal applicability in different machine tools. In addition, because the flexible hinge is used to replace the amplitude rod, the present invention can adjust the vibration effect and system rigidity to the optimal performance at the same time compared with traditional vibration-assisted processing equipment.

[0037] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A turning device with a flexible hinge, characterized in that: The turning device with a flexible hinge comprises a tool holder, a tool groove located at the front end of the tool holder and recessed inward from the upper surface of the tool holder, a tool body placed in the tool groove, a first piezoelectric ceramic stack and a second piezoelectric ceramic stack, the tool holder comprises an upper frame body and a lower frame body arranged up and down, the upper frame body comprises an upper frame body front end and an upper frame body rear end, the lower frame body comprises a lower frame body front end and a lower frame body rear end, the upper frame body rear end and the lower frame body rear end are integrally formed, the upper frame body front end and the lower frame body front end are connected by a first flexible hinge, the first piezoelectric ceramic stack is arranged between the front end of the lower frame body and the front end of the upper frame body, the upper frame body front end and the upper frame body rear end are connected by a second flexible hinge, the second piezoelectric ceramic stack is arranged between the front end of the upper frame body and the rear end of the upper frame body, and the first flexible hinge and the second flexible hinge are circular flexible hinges; The first piezoelectric ceramic stack and the second piezoelectric ceramic stack are arranged at 90 degrees, which is a parallel driving mode, so that the blade vibrates along an elliptical trajectory.

2. The turning device with a flexible hinge according to claim 1, characterized in that: The first piezoelectric ceramic stack is disposed in front of the first flexible hinge.

3. The turning device with a flexible hinge according to claim 2, characterized in that: The front end of the lower frame is hollowed out from top to bottom to form a first receiving groove. The first piezoelectric ceramic stack is located in the first receiving groove, fixed to the lower frame, and abutted against the upper frame.

4. The turning device with a flexible hinge according to claim 3, characterized in that: The turning device with a flexible hinge also includes a first baffle and a first position sensor. The first baffle is fixed on the upper frame, and the first position sensor is fixed on the lower frame to detect the displacement of the first baffle relative to the lower frame.

5. The turning device with a flexible hinge according to claim 3, characterized in that: The lower frame is provided with a first fixing screw, and the first fixing screw penetrates upward from the bottom of the lower frame to the first receiving groove to fix the first piezoelectric ceramic stack.

6. The turning device with a flexible hinge according to claim 1, characterized in that: The front end of the upper frame body and the front end of the lower frame body are spaced apart in the vertical direction.

7. The turning device with a flexible hinge according to claim 1, characterized in that: Two connecting members are provided between the front end of the upper frame and the rear end of the upper frame, a second receiving groove is provided between the two connecting members, and the second piezoelectric ceramic stack is arranged in the second receiving groove to abut against the front end of the upper frame and the rear end of the upper frame.

8. The turning device with a flexible hinge according to claim 7, characterized in that: The number of the second flexible hinges is two, and the two second flexible hinges are arranged at the connection between the two connecting members and the front end of the upper frame body.

9. The turning device with a flexible hinge according to claim 8, characterized in that: The turning device with a flexible hinge also includes a second baffle and a second position sensor, wherein the second baffle is fixed to the front end of the upper frame, and the second position sensor is fixed to the rear end of the upper frame or to a connecting member to detect the displacement of the second baffle relative to the rear end of the upper frame.

10. The turning device with a flexible hinge according to claim 7, characterized in that: The upper frame is provided with a second fixing screw, and the second fixing screw penetrates from the rear end of the upper frame toward the front end of the upper frame to the second receiving groove to fix the second piezoelectric ceramic stack.

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