Turning vibration suppression device

Abstract

The invention discloses a turning vibration suppression device which comprises a sensing system, a measuring system and a regulation and control system. The sensing system is arranged around a turning workpiece through a support, receives vibration energy of machining of the turning workpiece in a rolling abutting mode, suppresses vibration and transmits the vibration energy to the measuring system. The measurement system detects and feeds back the vibration intensity received by the sensing system in a mode of converting air pressure change into tension; the regulation and control system adjusts the execution system in a mode of converting displacement into air pressure change to resist the suppression intensity of the vibration intensity; the regulation and control system determines a regulation and control strategy of inhibition intensity according to a difference value between a measured value and a preset value; and a double-cutter cutting mode is adopted for turning. The device is exquisite in structure, reasonable in layout, high in adaptability, long in service life and high in measurement precision, and the problem that vibration is difficult to effectively restrain in the turning process is solved.

Description

Technical Field

[0001] The invention relates to the field of mechanical manufacturing, and in particular to a turning vibration suppression device. Background Art

[0002] The vibration in the turning process can be divided into forced vibration, self-excited vibration and other forms. The commonly used cutting parameter optimization method is mainly aimed at self-excited vibration, and the cutting parameter optimization method needs to modify the process parameters in the processing process, which is complicated to operate and more importantly, it cannot achieve good results. The active suppression method of machining vibration can effectively suppress the forced vibration, self-excited vibration and other vibration forms in the machining process, and does not affect the machining process planning, which has a high application value. Therefore, how to develop an active vibration suppression device and method for the turning process has become extremely important. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a turning vibration suppression device with sophisticated structure, reasonable layout, strong adaptability, long service life and high measurement accuracy, which solves the problem that vibration is difficult to effectively suppress during turning processing.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a turning vibration suppression device, including a sensing system, a measuring system and a control system; the sensing system is arranged around the turning workpiece through a bracket, and the sensing system receives the vibration energy of the turning workpiece through rolling resistance, suppresses the vibration, and transmits the vibration energy to the measuring system; the measuring system detects and feeds back the vibration intensity received by the sensing system by converting the air pressure change into a tensile force, and the control system adjusts the suppression intensity of the execution system to counteract the vibration intensity by converting the displacement into the air pressure change; the control system determines the control strategy of the suppression intensity based on the difference between the measured value and the preset value; the turning process adopts the double-knife cutting method.

[0005] Preferably, the bracket is in an arc shape or an annular shape, and the sensing system includes an air pressure damper arranged on the bracket and a gas circulation device arranged on the periphery of the bracket and connected to the air pressure damper.

[0006] Preferably, the pneumatic damper includes a pneumatic cylinder A that passes through and is fixed on the bracket, a cylinder cover arranged at the inner end of the pneumatic cylinder A, a piston rod matching the pneumatic cylinder A, a buffer spring arranged between the inner end of the piston rod and the cylinder cover, and a vibration detection ball rollingly arranged at the outer end of the piston rod. The outer port of the pneumatic cylinder A is connected to the gas circulation device, and the vibration detection ball contacts the outer surface of the turned workpiece.

[0007] Preferably, there are three air pressure dampers, which are respectively arranged above and on both sides of the turned workpiece.

[0008] Preferably, there are 4 pneumatic dampers, which are respectively arranged above, below and on both sides of the turning workpiece.

[0009] Preferably, the measuring system includes a pneumatic cylinder B connected to the gas circulation device through pipeline B. The pneumatic cylinder B is equipped with a fixing frame. The output end of the pneumatic cylinder B is sequentially connected to several guiding fixed pulleys and a pulley block through a deflecting rope. The pulley block is installed on a pulley frame. The pulley block includes several fixed pulleys, several movable pulleys and a rope around the pulley block. The fixed pulleys are assembled side by side on an upper bearing frame, and the upper bearing frame is fixedly connected to the top cover of the pulley frame. The movable pulleys are assembled side by side on a lower bearing frame. The upper end of the rope around the pulley block is fixed to the top cover of the pulley frame. A self-resetting tension sensor is connected between the lower end of the rope around the pulley block and the bottom plate of the pulley frame. The deflecting rope finally connects to a handle at the bottom of the lower bearing frame, and the deflecting rope between the last guiding fixed pulley and the handle remains in a vertical state.

[0010] Preferably, the control system includes a pneumatic cylinder C connected to the gas circulation device through pipeline C, and the pneumatic cylinder C is driven by an electric cylinder.

[0011] The beneficial effects of adopting the above technical solutions are as follows: The structure is delicate, the layout is reasonable, the adaptability is strong, the service life is long, and the measurement accuracy is high. It can effectively suppress the vibration during the turning process, achieving the purpose of improving the processing quality and efficiency and reducing the production cost. Description of the Drawings

[0012] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0013] Figure 1 It is an axonometric view of the overall structure of the vibration active suppression device during the turning process of the present invention.

[0014] Figure 2 It is an axonometric view of the vibration active suppression device during the turning process of the present invention excluding the lathe part.

[0015] Figure 3 It is a partial enlarged view of the measuring system of the present invention.

[0016] Figure 4 It is a cross-sectional view of the pneumatic damper of the present invention.

[0017] In the figure: 1. Sensing system; 2. Measuring system; 3. Regulation system; 4. Turned workpiece; 5. Bracket; 6. Pneumatic damper; 7. Pipeline C; 8. Pipeline B; 9. Gas flow device; 10. Pneumatic cylinder B; 11. Fixed frame; 12. Guide fixed pulley; 13. Rope around the pulley block; 14. Pulley block; 15. Pulley frame; 16. Direction-changing rope; 17. Self-resetting tension sensor; 18. Pneumatic cylinder C; 19. Electric cylinder; 20. Handle; 21. Lathe; 61. Pneumatic cylinder A; 62. Cylinder head; 63. Piston rod; 64. Buffer spring; 65. Vibration detection ball. Specific implementation mode

[0018] Refer to the appendix Figures 1-4 , in the structure of a specific implementation mode of the present invention, there is included a vibration suppression device for turning machining, which includes a sensing system, a measuring system and a regulation system; the sensing system is arranged around the turned workpiece through a bracket, and the sensing system receives the vibration energy generated during the turning machining of the turned workpiece in a rolling contact manner, suppresses the vibration, and transmits the vibration energy to the measuring system; the measuring system detects and feeds back the vibration intensity received by the sensing system by converting the air pressure change into tension, and the regulation system adjusts the suppression intensity of the execution system for counteracting the vibration intensity by converting the displacement into an air pressure change; the regulation system determines the regulation strategy of the suppression intensity according to the difference between the measured value and the preset value; the turning machining adopts a two-tool cutting method.

[0019] , the bracket is arc-shaped or circular-ring-shaped, and the sensing system includes a pneumatic damper arranged on the bracket and a gas flow device arranged on the outer periphery of the bracket and communicated with the pneumatic damper.

[0020] The pneumatic damper includes a pneumatic cylinder A penetrating and fixed on the bracket, a cylinder head arranged at the inner end of the pneumatic cylinder A, a piston rod matching the pneumatic cylinder A, a buffer spring arranged between the inner end of the piston rod and the cylinder head, and a vibration detection ball rollingly arranged at the outer end of the piston rod. The outer port of the pneumatic cylinder A is communicated with the gas flow device, and the vibration detection ball abuts against the outer surface of the turned workpiece.

[0021] There are 4 pneumatic dampers, which are respectively arranged above, below and on both sides of the turned workpiece.

[0022] The measurement system includes a pneumatic cylinder B connected to the gas flow device through pipeline B. The pneumatic cylinder B is equipped with a fixed frame. The output end of the pneumatic cylinder B is sequentially connected to a number of guiding fixed pulleys and a pulley block through a deflecting rope. The pulley block is installed on a pulley frame. The pulley block includes a number of fixed pulleys, a number of movable pulleys and a rope around the pulley block. The fixed pulleys are assembled side by side on an upper bearing frame, and the upper bearing frame is fixedly connected to the top cover of the pulley frame. The movable pulleys are assembled side by side on a lower bearing frame. The upper end of the rope around the pulley block is fixed to the top cover of the pulley frame. A self-resetting tension sensor is connected between the lower end of the rope around the pulley block and the bottom plate of the pulley frame. The deflecting rope is finally connected to a handle at the bottom of the lower bearing frame. The deflecting rope between the last guiding fixed pulley and the handle remains in a vertical state.

[0023] The regulation system includes a pneumatic cylinder C connected to the gas flow device through pipeline C. The pneumatic cylinder C is driven by an electric cylinder.

[0024] Working principle: During use, the assembled parts are cleaned with kerosene, dried, and then oil is applied to the mating surfaces. The non-machined surfaces of each part should be cleaned thoroughly, removing burrs. They are dip-coated with antirust paint, and multiple layers of PTFE tape are wound around the sealing ports to strictly ensure the sealing performance of the pneumatic cylinder and the connection between the pneumatic cylinder and the air pipe.

[0025] The electric cylinder in the regulation system moves, and through the pneumatic cylinder C, it inflates the gas flow device. At the same time, the gas flow device inflates the input end of the pneumatic cylinder B in the measurement system. The output end of the pneumatic cylinder B outputs a displacement, driving the pulley block to move. The pulley block amplifies the displacement, and the self-resetting tension sensor can identify the change in the pulling pressure of the rope around the pulley block on the self-resetting tension sensor. By comparing this actual measured change in pulling pressure with the set target change in pulling pressure before processing, the servo motor of the electric cylinder is controlled through PID to keep the pneumatic damper at a relatively low pressure state until the processing starts.

[0026] After the processing starts, the pressure of the pneumatic damper needs to be greater than the pressure of the pneumatic damper before the processing starts. The electric cylinder in the regulation system moves, and through the pneumatic cylinder C, it inflates the gas flow device to increase the pressure of the gas flow device. Due to the increase in the pressure of the gas flow device, the pulley block of the measurement system automatically drives the self-resetting tension sensor to move. By comparing the actual measured change in pulling pressure of the self-resetting tension sensor with the set change in pulling pressure after the processing starts, the output of the electric cylinder is controlled according to the specific difference to achieve keeping the pneumatic damper at a sufficiently large constant pressure state.

[0027] During the turning process of the workpiece, vibration occurs, affecting the pneumatic damper. The air pressure in the pneumatic damper changes, causing a change in the pneumatic cylinder B of the measurement system. The pneumatic cylinder B drives the pulley block to move through the guiding rope, thereby changing the reading of the self-resetting tension sensor. By comparing the change in the reading of the self-resetting tension sensor with the set change in the reading after the start of machining, the servo motor of the electric cylinder is controlled by PID to maintain the pneumatic damper at a sufficiently large constant output pressure state, providing support for the turning workpiece and effectively suppressing vibration during the machining process.

[0028] After the machining is completed, the electric cylinder in the control system moves, and the air filling amount of the pneumatic damper is discharged through the gas circulation device to reduce the pressure of the pneumatic damper. Due to the reduction of the pressure of the pneumatic damper, the pulley block of the measurement system drives the reading of the self-resetting tension sensor to change. By comparing the change in the actual measured tension and pressure reading with the set change in the reading after the machining is completed, the servo motor of the electric cylinder is controlled by PID according to the specific difference to maintain the pneumatic damper at a lower pressure state and wait for the next machining to start.

[0029] The above description is only proposed as a feasible technical solution of the present invention and does not serve as a single limiting condition for its technical solution itself.

Claims

1. Turning vibration suppression device, characterized in that: Including perception system, measurement system and control system; The sensing system is arranged around the turning workpiece through a bracket. The sensing system receives the vibration energy of the turning workpiece through rolling resistance, suppresses the vibration, and transmits the vibration energy to the measurement system. The measuring system detects and feeds back the vibration intensity received by the sensing system by converting the air pressure change into a pulling force, and the control system adjusts the suppression intensity of the execution system to counteract the vibration intensity by converting the displacement into the air pressure change; The control system determines the control strategy of the suppression intensity according to the difference between the measured value and the preset value; The turning process uses a double-knife cutting method.

2. The turning vibration suppression device according to claim 1, characterized in that: The bracket is in an arc shape or an annular shape, and the sensing system includes an air pressure damper arranged on the bracket and a gas circulation device arranged on the periphery of the bracket and connected with the air pressure damper.

3. The turning vibration suppression device according to claim 2, characterized in that: The pneumatic damper includes a pneumatic cylinder A that penetrates and is fixed on a bracket, a cylinder cover arranged at the inner end of the pneumatic cylinder A, a piston rod matched with the pneumatic cylinder A, a buffer spring arranged between the inner end of the piston rod and the cylinder cover, and a vibration detection ball rollingly arranged at the outer end of the piston rod. The outer port of the pneumatic cylinder A is connected to the gas circulation device, and the vibration detection ball contacts the outer surface of the turned workpiece.

4. The turning vibration suppression device according to claim 2, characterized in that: There are three air pressure dampers, which are respectively arranged above and on both sides of the turning workpiece.

5. The turning vibration suppression device according to claim 2, characterized in that: There are four air pressure dampers, which are respectively arranged above, below and on both sides of the turning workpiece.

6. The turning vibration suppression device according to claim 2, characterized in that: The measuring system includes a pneumatic cylinder B connected to the gas circulation device through a pipeline B, and the pneumatic cylinder B is equipped with a fixed frame. The output end of the pneumatic cylinder B is connected to a plurality of guide fixed pulleys and a pulley block in sequence through a change-of-direction rope. The pulley block is installed on the pulley frame. The pulley block includes a plurality of fixed pulleys, a plurality of movable pulleys and ropes around the pulley block. The fixed pulleys are assembled side by side on the upper bearing frame, and the upper bearing frame is fixedly connected to the top cover of the pulley frame. The movable pulleys are assembled side by side on the lower bearing frame. The upper end of the rope around the pulley block is fixed to the top cover of the pulley frame. A self-resetting tension sensor is connected between the lower end of the rope around the pulley block and the bottom plate of the pulley frame. The change-of-direction rope is finally connected to the handle at the bottom of the lower bearing frame. The change-of-direction rope between the last guide fixed pulley and the handle remains in a vertical state.

7. The turning vibration suppression device according to claim 2, characterized in that: The control system comprises a pneumatic cylinder C connected to the gas circulation device through a pipeline C, and the pneumatic cylinder C is driven by an electric cylinder.

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