阅读说明：本技术 一种基于柔性铰链结构的可分离式二维超声振动平台 (Detachable two-dimensional ultrasonic vibration platform based on flexible hinge structure ) 是由 宋博文 景秀并 王福军 张大卫 郑泽辉 于 2021-06-18 设计创作，主要内容包括：本发明公开了一种基于柔性铰链结构的可分离式二维超声振动平台,包括支撑底座,支撑底座的内部设置有两自由度运动解耦柔性铰链结构,两自由度运动解耦柔性铰链结构包括工作台,工作台位于两自由度运动解耦柔性铰链结构的中心,工作台的四周分别通过内侧柔性铰链与四个运动块相连接,每个运动块的两侧均设置有外侧柔性铰链,每个外侧柔性铰链的两端分别与运动块和支撑底座固定连接,四个运动块中的其中两个相邻运动块分别与两个位于同一水平面内且相互垂直布置的压电陶瓷驱动结构的出力端相接触,实现所述工作台的两自由度运动。本发明可解决普通微铣床加工硬脆材料存在切削力大、刀具磨损严重的问题,同时可用于加工表面纹理提高金属表面属性。(The invention discloses a separable two-dimensional ultrasonic vibration platform based on a flexible hinge structure, which comprises a supporting base, wherein a two-degree-of-freedom motion decoupling flexible hinge structure is arranged in the supporting base, the two-degree-of-freedom motion decoupling flexible hinge structure comprises a workbench, the workbench is positioned at the center of the two-degree-of-freedom motion decoupling flexible hinge structure, the periphery of the workbench is respectively connected with four motion blocks through inner flexible hinges, two sides of each motion block are respectively provided with outer flexible hinges, two ends of each outer flexible hinge are respectively fixedly connected with a motion block and the supporting base, two adjacent motion blocks in the four motion blocks are respectively contacted with two output ends of piezoelectric ceramic driving structures which are positioned in the same horizontal plane and are vertically arranged, and the two-degree-of-freedom motion of the workbench is realized. The invention can solve the problems of large cutting force and serious cutter abrasion in the common micro-milling machine for processing hard and brittle materials, and can be used for processing surface textures and improving the metal surface properties.)

1. A separable two-dimensional ultrasonic vibration platform based on a flexible hinge structure is characterized by comprising a support base (1), wherein the bottom of the support base (1) is fixed on a machine tool; the two-degree-of-freedom motion decoupling flexible hinge structure (2) is arranged in the supporting base (1), the two-degree-of-freedom motion decoupling flexible hinge structure (2) comprises a workbench (6), the workbench (6) is located at the center of the two-degree-of-freedom motion decoupling flexible hinge structure (2), the periphery of the workbench (6) is respectively connected with four motion blocks (8) through inner flexible hinges (7), outer flexible hinges (9) are arranged on two sides of each motion block (8), two ends of each outer flexible hinge (9) are respectively and fixedly connected with the motion blocks (8) and the supporting base (1), two adjacent motion blocks (8) in the four motion blocks (8) are respectively contacted with the output ends of two piezoelectric ceramic driving structures (4) which are located in the same horizontal plane and are arranged vertically to each other, and realizing the two-degree-of-freedom motion of the workbench (6).

2. The separable two-dimensional ultrasonic vibration platform based on the flexible hinge structure is characterized in that the two-degree-of-freedom motion decoupling flexible hinge structure (2) further comprises four fixed blocks (5), and the four fixed blocks (5) are fixedly connected to four inner corners of the support base (1) through screws (3) respectively; one end of each outer flexible hinge (9) is fixedly connected to the corresponding fixed block (5), and the fixed block (5) fixedly connects the two-degree-of-freedom motion decoupling flexible hinge structure (2) with the support base (1) through a screw (3).

3. The separable two-dimensional ultrasonic vibration platform based on flexible hinge structure according to claim 1, characterized in that the outer flexible hinge (9) is composed of two parallel-connected straight beam type flexible hinges.

4. The separable two-dimensional ultrasonic vibration platform based on the flexible hinge structure is characterized in that the inner flexible hinge (7) is composed of one straight beam type flexible hinge or two parallel-connected straight beam type flexible hinges.

5. The separable two-dimensional ultrasonic vibration platform based on the flexible hinge structure as claimed in claim 3 or 4, wherein both ends of the straight beam type flexible hinge are rounded to prevent stress concentration.

6. The separable two-dimensional ultrasonic vibration platform based on the flexible hinge structure is characterized in that the piezoceramic driving structure (4) comprises an encapsulated cylindrical piezoceramic actuator (10) and a pre-tightening mechanism, a force output end of the encapsulated cylindrical piezoceramic actuator (10) is in close contact with the corresponding motion block (8), and the pre-tightening mechanism is used for providing pre-tightening force to the encapsulated cylindrical piezoceramic actuator (10).

7. The separable two-dimensional ultrasonic vibration platform based on the flexible hinge structure is characterized in that the piezoceramic driving structure (4) further comprises a piezoceramic support block (11), the packaged cylindrical piezoceramic actuator (10) is supported by the piezoceramic support block (11), and the piezoceramic support block (11) is fixedly connected with the support base (1).

8. The separable two-dimensional ultrasonic vibration platform based on the flexible hinge structure is characterized in that the pre-tightening mechanism comprises a pre-tightening module (12) and a pre-tightening bolt (13), the pre-tightening module (12) is in close contact with the tail end of the packaged cylindrical piezoelectric ceramic actuator (10), the pre-tightening bolt (13) is in threaded connection with the side wall of the supporting base (1), the end part of the pre-tightening bolt (13) extends into the supporting base (1) to be in close contact with the pre-tightening module (12) and provides pressure for the pre-tightening module (12), and the pre-tightening module (12) directly provides pre-tightening force for the packaged cylindrical piezoelectric ceramic actuator (10).

9. The separable two-dimensional ultrasonic vibration platform based on the flexible hinge structure is characterized in that the packaged cylindrical piezoelectric ceramic actuator (10) is provided with voltage by a piezoelectric ceramic controller, and the amplitude and the frequency of the vibration of the workbench (6) are adjusted by adjusting the output power and the frequency of the piezoelectric ceramic controller.

Technical Field

The invention relates to a special processing technology, in particular to a separable two-dimensional ultrasonic vibration auxiliary micro-milling workbench based on a straight beam type flexible hinge structure.

Background

The demand for high precision micro parts in various industrial fields is increasing, especially in the aspects of aerospace, biomedicine, electronic communication, environmental protection and the like. The micro-cutting technology, particularly the micro-milling technology has unique advantages in the aspect of processing micro parts with three-dimensional complex structures, and becomes an effective way for processing micro parts with three-dimensional complex structures. However, micro-milling of hard and brittle materials such as ceramics, silicon, diamond, optical glass and the like has the problems of serious tool wear, large heat generation, poor surface quality and the like. In order to solve the long-standing problem, a mode commonly adopted at home and abroad is to apply vibration on the basis of micro-milling, namely a vibration auxiliary processing technology. According to the technology, periodic high-frequency vibration is generated between the workpiece and the milling cutter, so that a periodic gap is generated between the workpiece and the milling cutter, and cooling liquid can flow into a working area to take away heat and chips. Experiments show that the vibration-assisted machining technology can effectively reduce the abrasion of the cutter in the micro-milling process, effectively control the cutting force and the heat generation amount, and obviously improve the geometric precision and the surface quality of a machined workpiece. Meanwhile, researches show that various textures can be processed on the surface of a workpiece through a vibration-assisted processing technology, the surface performance of the workpiece can be further improved, for example, the hydrophobicity of the ceramic tooth surface can be improved through vibration-assisted processing, the smoothness of the metal alloy surface can be improved through vibration-assisted processing of the textures, and the like. Compared with the traditional milling, the micro milling puts higher requirements on the precision of the main shaft, so that an ultrasonic vibration system cannot be added on the main shaft of the machine tool like a large machine tool. Therefore, aiming at micro-milling, the two-dimensional vibration workbench is designed to avoid the change of the main shaft of the micro-machine tool.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, provides a separable two-dimensional ultrasonic vibration auxiliary micro-milling workbench based on a straight beam type flexible hinge structure and provided with ultrasonic vibration in two directions, can solve the problems of large cutting force and serious cutter abrasion in the process of processing hard and brittle materials by using a common micro-milling machine, and can be used for processing surface textures and improving the metal surface properties.

The technical scheme adopted by the invention is as follows: a separable two-dimensional ultrasonic vibration platform based on a flexible hinge structure comprises a support base, wherein the bottom of the support base is fixed on a machine tool; the two-degree-of-freedom motion decoupling flexible hinge structure is arranged inside the supporting base and comprises a workbench, the workbench is located at the center of the two-degree-of-freedom motion decoupling flexible hinge structure, the periphery of the workbench is connected with four motion blocks through inner side flexible hinges respectively, outer side flexible hinges are arranged on two sides of each motion block respectively, two ends of each outer side flexible hinge are fixedly connected with the motion blocks and the supporting base respectively, and two adjacent motion blocks in the four motion blocks are in contact with the ends of two piezoelectric ceramic driving structures which are located in the same horizontal plane and are vertically arranged mutually, so that two-degree-of-freedom motion of the workbench is achieved.

Further, the two-degree-of-freedom motion decoupling flexible hinge structure further comprises four fixed blocks, and the four fixed blocks are fixedly connected to four inner corners of the support base through screws respectively; one end of each outer flexible hinge is fixedly connected to the corresponding fixed block, and the fixed block fixedly connects the two-degree-of-freedom motion decoupling flexible hinge structure with the support base through screws.

Further, the outer flexible hinge is composed of two straight beam type flexible hinges connected in parallel.

Further, the inner flexible hinge is composed of a straight beam type flexible hinge or two parallel-connected straight beam type flexible hinges.

Furthermore, two end parts of the straight beam type flexible hinge are rounded, so that stress concentration is prevented.

Furthermore, the piezoelectric ceramic driving structure comprises a packaged cylindrical piezoelectric ceramic actuator and a pre-tightening mechanism, wherein the force output end of the packaged cylindrical piezoelectric ceramic actuator is in close contact with the corresponding moving block, and the pre-tightening mechanism provides pre-tightening force for the packaged cylindrical piezoelectric ceramic actuator.

Furthermore, the piezoelectric ceramic driving structure further comprises a piezoelectric ceramic supporting block, the packaged cylindrical piezoelectric ceramic actuator is supported by the piezoelectric ceramic supporting block, and the piezoelectric ceramic supporting block is fixedly connected with the supporting base.

Furthermore, the pre-tightening mechanism comprises a pre-tightening module and a pre-tightening bolt, the pre-tightening module is in close contact with the tail end of the packaged cylindrical piezoelectric ceramic actuator, the pre-tightening bolt is in threaded connection with the side wall of the supporting base, the end part of the pre-tightening bolt extends into the supporting base to be in close contact with the pre-tightening module and provides pressure for the pre-tightening module, and the pre-tightening module directly provides pre-tightening force for the packaged cylindrical piezoelectric ceramic actuator.

Further, the packaged cylindrical piezoelectric ceramic actuator is provided with voltage by a piezoelectric ceramic controller, and the amplitude and the frequency of the vibration of the workbench are adjusted by adjusting the output power and the frequency of the piezoelectric ceramic controller.

The invention has the beneficial effects that:

the vibration platform adopts straight beam type flexible hinges with parallel structures inside and outside, so that parasitic errors generated by modules can be offset, and the precision of the platform is improved; meanwhile, the symmetrical structure can also improve the capability of the platform for resisting external interference such as heat effect and the like; and the axial rigidity of the platform can be improved, and the natural frequency of the platform is effectively improved. The round hole in the middle of the workbench is used for clamping a workpiece, and the fixing block of the two-degree-of-freedom motion decoupling flexible hinge structure is horizontally connected with the supporting base, so that a better fixing effect can be achieved. The support base is separable from the two-degree-of-freedom motion decoupling flexible hinge structure, and various flexible hinge structures can be designed to be suitable for different processing occasions. The amplitude and frequency of the vibration of the worktable can be adjusted by adjusting the input power and frequency of the computer.

Drawings

FIG. 1: the invention is a schematic three-dimensional structure;

FIG. 2: front view of the invention;

FIG. 3: top view of the invention;

the attached drawings are marked as follows:

1-a support base; 2-two-degree-of-freedom motion decoupling flexible hinge structure;

3-screw; 4-piezoelectric ceramic driving structure;

5-fixed block; 6-the working table;

7-inner flexible hinge; 8-motion block;

9-outer flexible hinge; 10-packed column piezoelectric ceramic actuator;

11-piezoelectric ceramic supporting block; 12-pretensioning module;

13-prestressed bolt.

Detailed Description

In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:

as shown in fig. 1 to 3, the separable two-dimensional ultrasonic vibration platform based on the flexible hinge structure comprises a support base 1, a two-degree-of-freedom motion decoupling flexible hinge structure 2, a piezoelectric ceramic driving structure 4 and the like.

The bottom of the supporting base 1 is directly fixed on the machine tool through bolts. The support base 1 is connected with the two-degree-of-freedom motion decoupling flexible hinge structure 2 through a screw 3 and used for supporting and fixing the two-degree-of-freedom motion decoupling flexible hinge structure 2. The support base 1 and the two-degree-of-freedom motion decoupling flexible hinge structure 2 can be separated, and flexible hinge structures with different structures and sizes can be designed to correspond to different natural frequencies and rigidities so as to be suitable for different processing occasions.

The two-degree-of-freedom motion decoupling flexible hinge structure 2 comprises a workbench 6 arranged in the middle, four fixed blocks 5 playing a role in fixing, four moving blocks 8 responsible for transferring motion, four inner flexible hinges 7 and eight outer flexible hinges 9. Four fixed blocks 5 are respectively through screw 3 fixed connection support base 1's four internal corners department and with support base 1 in close contact with, can play better fixed action. The workstation 6 is located support base 1's inside center, workstation 6 is passed through respectively all around four inboard flexible hinges 7 with four motion pieces 8 are connected, every motion piece 8's both sides all are provided with outside flexible hinge 9, every outside flexible hinge 9's one end with motion piece 8 fixed connection, other end fixed connection correspond on the fixed block 5, through fixed block 5 with support base 1 fixed connection. Two adjacent motion blocks 8 of the four motion blocks 8 are respectively connected with two piezoelectric ceramic driving structures 4 which are positioned in the same horizontal plane and are arranged vertically to each other, so that two-degree-of-freedom motion of the workbench 6 is realized.

The outer flexible hinge 9 is composed of two straight beam type flexible hinges connected in parallel. The inner flexible hinge 7 is composed of a straight beam type flexible hinge or two parallel-connected straight beam type flexible hinges, and in this embodiment, the inner flexible hinge 7 is composed of two parallel-connected straight beam type flexible hinges. Both ends of all the straight beam type flexible hinges are rounded off to prevent stress concentration.

The piezoelectric ceramic driving structure 4 comprises a packaged cylindrical piezoelectric ceramic actuator 10, a pre-tightening mechanism and a piezoelectric ceramic supporting block 11. The force output end of the packaged cylindrical piezoelectric ceramic actuator 10 is in close contact with the corresponding moving block 8, and a pretightening force is provided for the packaged cylindrical piezoelectric ceramic actuator 10 through the pretightening mechanism, wherein the pretightening mechanism comprises a pretightening module 12 and a prestress bolt 13, the pretightening module 12 is in close contact with the tail end of the packaged cylindrical piezoelectric ceramic actuator 10, the prestress bolt 13 is in threaded connection with the side wall of the supporting base 1, and the end part of the prestress bolt 13 extends into the supporting base 1 to be in close contact with the pretightening module 12 and provides pressure for the pretightening module 12, so that the pretightening force is provided for the packaged cylindrical piezoelectric ceramic actuator 10. The packaged cylindrical piezoelectric ceramic actuator 10 is supported by the piezoelectric ceramic support block 11, and the piezoelectric ceramic support block 11 is fixedly connected with the support base 1.

The packaged cylindrical piezoelectric ceramic actuator 10 is provided with voltage by a piezoelectric ceramic controller, converts an electric signal into a vibration displacement signal and transmits the vibration displacement signal to the two-degree-of-freedom motion decoupling flexible hinge structure 2, so that the workbench 6 of the two-degree-of-freedom motion decoupling flexible hinge structure 2 is subjected to high-frequency mechanical vibration. The amplitude and the frequency of the vibration of the worktable 6 can be adjusted by adjusting the input power and the frequency of the piezoelectric ceramic controller.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the present invention as defined in the appended claims.