A thin-walled part milling vibration control device and method

Abstract

The application provides a thin-wall workpiece milling vibration control device and method, relates to the field of machining vibration control, and aims at the problem that liquid is used to suppress vibration during the milling of the thin-wall workpiece at present, vibration parameters are collected based on a vibration sensing sheet, a rubber damper with adjustable vibration control effect is arranged, workpiece vibration is weakened, vibration is adaptively controlled by changing the motion parameters of fluid medium filled in the internal flow channel of the rubber damper, the problems that liquid damping is inconvenient to arrange, inconvenient to clean and has a large influence on the environment are solved, and the controllability of vibration is improved.

Description

Technical Field

[0001] This invention relates to the field of vibration control in workpiece processing, and specifically to a vibration control device and method for milling thin-walled parts. Background Technology

[0002] Thin-walled structures are widely used in the aerospace field, such as blades and bladed disks for aero engines. These parts are typically complex in structure and have low rigidity, making them prone to chattering during milling, which affects machining efficiency and accuracy. Currently, various methods exist for chatter control in the machining of thin-walled parts, including vibration-damping tools, intelligent spindles, and additional damping. Adding damping can absorb machining vibration energy, achieving chatter suppression; alternatively, increasing the rigidity of the system can reduce the probability of chattering.

[0003] Existing technologies offer various solutions for suppressing milling vibrations in thin-walled structures. One approach involves completely immersing the workpiece in a liquid, allowing direct contact between the machining system and the liquid. The viscous liquid increases the damping of the milling system, thus suppressing chatter. However, this requires a highly sealed liquid container, and the liquid may splash out during high-speed machining, polluting the environment. It is also unsuitable for use on large workpieces. Another approach is to use fluid-driven auxiliary supports to create fluid support forces acting on the symmetrical sides of the machining surface of the thin-walled part, acting as auxiliary supports to suppress machining vibrations. Alternatively, liquid impact pressure can also act as auxiliary supports to suppress chatter. Utilizing liquid to increase the damping of the machining system can improve its stability and achieve the goal of chatter suppression. However, the following problems still exist: the relevant methods generally require the machining system (tool and workpiece) to be placed in a liquid environment. The high-speed rotation of the tool during machining may cause liquid splashing, and the subsequent liquid recovery and treatment issues increase the possibility of environmental pollution; the viscous liquid adhering to the workpiece surface is inconvenient to clean; the workpiece is in direct contact with the liquid, so a container is needed to hold both the liquid and the workpiece, which is difficult to use on large workpieces; the intensity of vibration changes constantly during machining, and the current solutions cannot achieve adaptive control of vibration, resulting in the vibration control effect failing to meet the requirements. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a vibration control device and method for milling thin-walled parts. The device collects vibration parameters based on vibration sensing plates and sets up a rubber damper with adjustable vibration control effect to weaken workpiece vibration. By changing the motion parameters of the fluid medium in the internal flow channel of the rubber damper, the vibration is adaptively controlled, solving the problems of inconvenient placement, cleaning, and significant environmental impact of liquid damping, and improving the controllability of vibration.

[0005] The first objective of this invention is to provide a vibration control device for milling thin-walled parts, which adopts the following solution:

[0006] It includes a rubber damper, which has a flow channel for the flow of fluid medium inside. The inlet end of the flow channel is connected to the medium source through a flexible tube, and the outlet end of the flow channel is used to output the fluid medium in the flow channel. The side of the rubber damper facing the workpiece is the working surface. The working surface is attached to the workpiece through a vibration sensing plate. Based on the vibration parameters of the workpiece collected by the vibration sensing plate, the motion parameters of the fluid medium in the input flow channel are controlled to control the vibration of the workpiece.

[0007] Furthermore, the flow channel is a continuous curved channel, which includes alternating acceleration sections and constant speed sections. The axes of the acceleration sections and the constant speed sections are perpendicular to the working surface, and adjacent acceleration sections and constant speed sections are connected end to end.

[0008] Furthermore, along the axis of the acceleration section and towards the working surface, the cross-sectional area of ​​the corresponding flow channel in the acceleration section gradually decreases to increase the flow velocity of the fluid medium in the acceleration section at the end near the working surface; along the axis of the uniform speed section, the cross-sectional area of ​​the corresponding flow channel in the uniform speed section is equal.

[0009] Furthermore, the fluid medium is silicone oil, and a hydraulic pump is installed on the flexible pipe connected to the inlet end of the flow channel to control the flow rate and velocity of the silicone oil.

[0010] Furthermore, the outlet end is connected to the oil storage tank via a flexible pipe, and the hydraulic pump is connected to the oil storage tank, so that the flow of the fluid medium forms a closed loop.

[0011] Furthermore, the vibration sensing sheet includes a vibration sensor layer and a magnet layer that are attached to each other. The vibration sensor layer is located between the magnet layer and the working surface. The vibration sensor layer collects the vibration parameters of the workpiece and sends them to the controller.

[0012] Furthermore, it also includes a controller, which is connected to a vibration sensor and can control the motion parameters of the fluid medium in the input flow channel.

[0013] Furthermore, the rubber damper has a flow channel formed inside by a guide plate. The inlet end of the flow channel is located on one end face of the rubber damper, and the outlet end of the flow channel is located on the other end face of the rubber damper away from the inlet end. The inlet end and the outlet end are arranged to avoid the working surface.

[0014] A second objective of the present invention is to provide a method for operating the vibration control device for thin-walled part milling as described in the first objective, comprising:

[0015] The rubber damper is attached to the workpiece via a vibration sensing sheet, and the inlet end of the flow channel is connected to the medium source via a flexible tube.

[0016] During workpiece milling, vibration parameters of the workpiece are collected, and fluid medium is injected into the flow channel;

[0017] Based on the collected vibration parameters, the motion parameters of the fluid medium are adjusted to reduce workpiece vibration.

[0018] Furthermore, adjusting the flow rate and velocity of the fluid medium within the flow channel can suppress workpiece vibration.

[0019] Compared with the prior art, the advantages and positive effects of this invention are:

[0020] (1) In view of the problem of using liquid to suppress vibration during the milling of thin-walled workpieces, vibration parameters are collected based on vibration sensing plates, and a rubber damper with adjustable vibration control effect is set to weaken the vibration of the workpiece. By changing the motion parameters of the fluid medium in the internal flow channel of the rubber damper, the vibration is adaptively controlled, which solves the problems of inconvenient placement, inconvenient cleaning and large impact on the environment of liquid damping, and improves the controllability of vibration.

[0021] (2) By taking multiple measures to increase the additional damping of the system, on the one hand, rubber materials are used to make dampers to improve the additional mass and damping of the workpiece; on the other hand, high-damping silicone oil flows inside the rubber damper to further increase the damping of the system and jointly improve the vibration control effect.

[0022] (3) The internal flow channel of the damper can accelerate the flow of silicone oil when it flows towards the workpiece, improve the support effect of the area near the workpiece in the flow channel, offset part of the milling force, and reduce the vibration of the workpiece; and according to the vibration of the workpiece, the hydraulic pump can be controlled to adjust the flow rate and velocity of the silicone oil to achieve flutter control and achieve the effect of adaptive vibration control of the rubber damper.

[0023] (4) When silicone oil is used as a fluid medium to form a damping effect, the silicone oil is in a closed state during the flow process. The rubber damper, flexible tube and oil tank form a closed loop. The silicone oil will not leak and pollute the environment. It can be recycled and green manufacturing is achieved.

[0024] (5) The vibration control device for thin-walled milling provided in this invention is not limited by the size of the workpiece being processed. The size of the rubber damper can be customized according to the size of the workpiece, or the rubber damper can be manufactured in a standard size. According to the size of the workpiece, an appropriate number of rubber dampers can be selected and installed on the workpiece to meet the vibration control requirements. Attached Figure Description

[0025] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0026] Figure 1 This is a schematic diagram of the composition of the vibration control device for thin-walled part milling in Embodiments 1 and 2 of the present invention.

[0027] Figure 2 This is a schematic diagram of the rubber damper in Embodiments 1 and 2 of the present invention.

[0028] Figure 3 This is a schematic diagram of the internal structure of the rubber damper in Embodiments 1 and 2 of the present invention.

[0029] Figure 4 This is a cross-sectional schematic diagram of the rubber damper in Embodiments 1 and 2 of the present invention.

[0030] The components include: 1. Oil reservoir; 2. Hydraulic pump; 3. Oil inlet pipe; 4. Cutting tool; 5. Workpiece; 6. Vibration sensor plate; 7. Rubber damper; 8. Oil outlet pipe; 9. Clamping mechanism; 10. Inlet end; 11. Magnet plate layer; 12. Vibration sensor layer; 13. Guide plate. Detailed Implementation

[0031] Example 1

[0032] In a typical embodiment of the present invention, such as Figures 1-4 As shown, a vibration control device for milling thin-walled parts is presented.

[0033] Utilizing liquid to increase the damping of the machining system improves its stability and suppresses chatter. Generally, the machining system (tool 4, workpiece 5) needs to be placed in a liquid environment. The high-speed rotation of tool 4 during machining may cause liquid splashing, and subsequent liquid recovery and treatment increase the possibility of environmental pollution. The viscous liquid adhering to the surface of workpiece 5 is difficult to handle. Workpiece 5 needs to be placed in a liquid medium, but using ordinary containers is inconvenient for simultaneously containing both the liquid and workpiece 5 and clamping it in the machining equipment, making it difficult to machine large workpieces using appropriate methods. Furthermore, the intensity of vibration changes constantly during machining, and current solutions cannot adapt to these changes.

[0034] Based on this, in this embodiment, a rubber damper 7 with a flow channel is configured. By changing the flow parameters of the fluid medium injected into the flow channel, the vibration control effect is adjusted. The fluid medium flows in a closed loop and leaks out of the surface. The vibration signal is collected based on the vibration sensing plate 6, and the flow parameters of the fluid medium are controlled to achieve adaptive control of the rubber damper 7 and improve the vibration control effect on the workpiece 5.

[0035] The following is a detailed description of the vibration control device for milling thin-walled workpiece 5, with reference to the accompanying drawings.

[0036] See Figure 1 The vibration control device for milling thin-walled workpiece 5 includes a rubber damper 7. The rubber damper 7 has a flow channel for the flow of fluid medium. When the fluid medium flows through the flow channel, it changes the composition and distribution inside the rubber damper 7, thereby changing the overall damping effect of the rubber damper 7.

[0037] The inlet end 10 of the flow channel is connected to the medium source through a flexible tube, and the outlet end of the flow channel is used to output the fluid medium in the flow channel; the medium source injects the fluid medium into the flow channel through the flexible tube, and the fluid medium is discharged through the outlet end of the flow channel after flowing through the flow channel.

[0038] In this embodiment, in order to recycle the fluid medium, the oil storage tank 1 is used as the medium source. The flexible tube draws the fluid medium from the oil storage tank 1 and supplies it to the inlet end 10 of the flow channel. At the same time, the fluid medium output from the outlet end of the flow channel is also introduced into the oil storage tank 1 for collection, thus forming a closed-loop flow of the fluid medium.

[0039] The side of the rubber damper 7 facing the workpiece 5 is the working surface. The working surface is attached to the workpiece 5 through the vibration sensing plate 6. Based on the vibration parameters of the workpiece 5 collected by the vibration sensing plate 6, the motion parameters of the fluid medium in the input flow channel are controlled to control the vibration of the workpiece 5.

[0040] The motion parameters of the fluid medium include velocity and flow rate. The fluid medium is silicone oil. A hydraulic pump 2 is installed on the flexible pipe connected to the inlet end 10 of the flow channel to control the flow rate and velocity of the silicone oil entering the flow channel.

[0041] The rubber damper 7 is a damper made of rubber material, and a continuously curved flow channel is designed inside the rubber damper 7. On the one hand, the high damping of the rubber and fluid medium improves the damping performance of the system, and the high-speed flowing fluid medium provides the workpiece 5 with a support force in the opposite direction to the cutting force, thereby reducing vibration. On the other hand, the flow rate and flow volume of the fluid medium are adjusted by adaptive control to achieve the purpose of adaptive control of chatter, thus meeting the development needs of intelligent manufacturing and green manufacturing.

[0042] like Figure 1 As shown, the outlet end is connected to the oil storage tank 1 through a flexible pipe, and the hydraulic pump 2 is connected to the oil storage tank 1, so that the flow of the fluid medium forms a closed loop.

[0043] The vibration sensing plate 6 includes a vibration sensor layer 12 and a magnet layer 11 that are attached to each other. The vibration sensor layer 12 is located between the magnet layer 11 and the working surface. The vibration sensor layer 12 collects the vibration parameters of the workpiece 5 and sends them to the controller. The magnet layer 11 is arranged on the side close to the workpiece 5 and is used to fix the rubber damper 7 to the workpiece 5. The controller is connected to the vibration sensing plate 6 and can control the motion parameters of the fluid medium in the input flow channel.

[0044] Taking silicone oil as an example, the oil reservoir 1 is used to store silicone oil. The flexible pipe connecting the oil reservoir 1 to the inlet end 10 of the flow channel is the oil inlet pipe 3, which provides a pipeline for silicone oil to enter the rubber damper 7. The flexible pipe connecting the oil reservoir 1 to the outlet end of the flow channel is the oil outlet pipe 8, which provides a pipeline for silicone oil to exit the rubber damper 7. The oil reservoir 1 supplies silicone oil to the oil inlet pipe 3 and stores the silicone oil circulated in the oil outlet pipe 8. The hydraulic pump 2 provides power for the flow of silicone oil. The hydraulic pump 2 is connected to a controller. The controller can adjust the working state of the hydraulic pump 2, thereby controlling the flow rate and velocity of the silicone oil and changing the motion parameters of the silicone oil input into the rubber damper 7.

[0045] like Figure 2 As shown, the rubber damper 7 is made of rubber material with a large damping coefficient and good damping performance, which is suitable for the consumption of vibration energy during processing.

[0046] like Figure 3 As shown, the flow channel is a continuous curved channel. To clearly demonstrate the flow channel within the damper, the rubber damper 7 is shown in cross-section. For example... Figure 4 As shown, the flow channel includes alternating acceleration sections and constant velocity sections. The axes of the acceleration sections and constant velocity sections are perpendicular to the working surface, and adjacent acceleration and constant velocity sections are connected end to end. Figure 4 The section shown in the diagram represents the rubber material portion of the rubber damper 7, while the un-sectioned portion represents the flow channel. The arrows within the flow channel indicate the flow direction of the silicone oil within the channel.

[0047] When the rubber damper 7 is working, the inside of the flow channel is filled with silicone oil. The silicone oil has a certain viscosity, which increases the damping performance of the rubber damper 7.

[0048] Along the axis of the acceleration section, towards the working surface, the cross-sectional area of ​​the corresponding flow channel in the acceleration section gradually decreases to increase the flow velocity of the fluid medium near the working surface within the acceleration section; for example... Figure 4 As shown, in the direction of silicone oil flowing towards workpiece 5, the width of the flow channel gradually narrows (flow channel width a>b), which causes the silicone oil velocity to gradually increase, providing a certain flow support force for workpiece 5, offsetting part of the milling force during processing, and reducing the vibration intensity of workpiece 5.

[0049] Along the axial direction of the uniform velocity segment, the cross-sectional areas of the corresponding flow channels in the uniform velocity segment are equal; for example... Figure 4 As shown, when silicone oil flows in the direction away from the workpiece, the width of the flow channel it passes through is constant, c = d.

[0050] The rubber damper 7 has a flow channel formed inside by the guide plate 13. The inlet end 10 of the flow channel is located on one end face of the rubber damper 7, and the outlet end of the flow channel is located on the other end face of the rubber damper 7 away from the inlet end 10. The inlet end 10 and the outlet end are arranged to avoid the working surface.

[0051] The vibration sensor layer 12 is located between the magnet sheet layer 11 and the rubber damper 7. It is equipped with vibration sensing elements such as vibration sensors to monitor and collect the vibration signals of the workpiece 5 and transmit them to the controller. The controller can be a computer or similar device. Based on the vibration signals of the workpiece 5 transmitted by the vibration sensor, the controller determines the intensity of the vibration of the workpiece 5. According to the magnitude of the vibration of the workpiece 5, the controller controls the hydraulic pump 2 to regulate the flow rate and velocity of the silicone oil. The vibration sensor 6 monitors the vibration acceleration of the workpiece 5 in real time during processing and provides real-time feedback to the controller. When the vibration acceleration is high, the silicone oil flow rate is increased; conversely, the silicone oil flow rate is decreased to suppress the vibration of the workpiece 5.

[0052] Vibration control devices for thin-walled milling are not limited by the size of the workpiece being processed. The size and specifications of the rubber dampers can be customized according to the size of the workpiece, or the rubber dampers can be manufactured in standard sizes. Depending on the size of the workpiece, an appropriate number of rubber dampers can be selected and installed on the workpiece to meet the vibration control requirements.

[0053] Example 2

[0054] In another typical embodiment of the present invention, such as Figures 1-4 As shown, a working method for a vibration control device for milling thin-walled parts is presented.

[0055] The rubber damper 7 is attached to the workpiece 5 through the vibration sensing plate 6, and the inlet end 10 of the flow channel is connected to the medium source through a flexible tube. The workpiece 5 is clamped on the clamping mechanism 9 of the external milling equipment.

[0056] During the milling of workpiece 5, the vibration parameters of workpiece 5 are collected, and fluid medium is injected into the flow channel.

[0057] Based on the collected vibration parameters, the motion parameters of the fluid medium are adjusted to reduce the vibration of workpiece 5.

[0058] Vibration of workpiece 5 is suppressed by adjusting the flow rate and velocity of the fluid medium in the flow channel.

[0059] The rubber damper 7 is made of rubber material and has a specially shaped flow channel inside. The rubber damper 7 of the corresponding size can be designed and manufactured according to the size of the workpiece 5 to form an adaptive damper.

[0060] A closed-loop oil circuit is formed by combining the rubber damper 7 with the pipeline, oil tank 1, and hydraulic pump 2. The rubber damper 7 is attached to one side of the workpiece 5 (opposite to the tool 4). The added mass of the rubber damper 7 can improve the rigidity of the machining system. On the other hand, the internal silicone oil can improve the damping of the system. Moreover, the special flow channel can increase the speed of the silicone oil when it flows towards the workpiece 5, providing a certain support force and reducing the vibration of the workpiece 5.

[0061] The silicone oil flow process is a completely closed environment, which will not cause leakage and can be recycled. In addition, a vibration sensing plate 6 is attached between the rubber damper 7 and the workpiece 5 to monitor the vibration acceleration of the workpiece 5 during the processing at all times and provide real-time feedback to the control terminal. When the vibration acceleration is large, the system automatically increases the silicone oil flow rate, and vice versa.

[0062] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A vibration control device for milling thin-walled parts, characterized in that, It includes a rubber damper, which has a flow channel for the flow of fluid medium inside. The inlet end of the flow channel is connected to the medium source through a flexible tube, and the outlet end of the flow channel is used to output the fluid medium in the flow channel. The side of the rubber damper facing the workpiece is the working surface. The working surface is attached to the workpiece through a vibration sensor. Based on the vibration parameters of the workpiece collected by the vibration sensor, the motion parameters of the fluid medium in the input flow channel are controlled to control the vibration of the workpiece. The flow channel is a continuous curved channel, which includes alternating acceleration sections and constant velocity sections. The axes of the acceleration sections and the constant velocity sections are perpendicular to the working surface, and adjacent acceleration sections and constant velocity sections are connected end to end. Along the axis of the acceleration section and the direction closer to the working surface, the cross-sectional area of ​​the flow channel corresponding to the acceleration section gradually decreases to increase the flow velocity of the fluid medium in the acceleration section at the end closer to the working surface. Along the axis of the constant velocity section, the cross-sectional area of ​​the flow channel corresponding to the constant velocity section is equal.

2. The vibration control device for thin-walled part milling as described in claim 1, characterized in that, The fluid medium is silicone oil, and a hydraulic pump is installed on the flexible pipe at the inlet of the flow channel to control the flow rate and velocity of the silicone oil.

3. The vibration control device for milling thin-walled parts as described in claim 2, characterized in that, The outlet end is connected to the oil storage tank through a flexible pipe, and the hydraulic pump is connected to the oil storage tank, so that the flow of the fluid medium forms a closed loop.

4. The vibration control device for milling thin-walled parts as described in claim 1, characterized in that, The vibration sensing sheet includes a vibration sensor layer and a magnet layer that are attached to each other. The vibration sensor layer is located between the magnet layer and the working surface. The vibration sensor layer collects the vibration parameters of the workpiece and sends them to the controller.

5. The vibration control device for milling thin-walled parts as described in claim 4, characterized in that, It also includes a controller, which is connected to a vibration sensor and can control the motion parameters of the fluid medium in the input channel.

6. The vibration control device for milling thin-walled parts as described in claim 1, characterized in that, The rubber damper has a flow channel formed inside by a guide plate. The inlet end of the flow channel is located on one end face of the rubber damper, and the outlet end of the flow channel is located on the other end face of the rubber damper away from the inlet end. The inlet end and the outlet end are arranged to avoid the working surface.

7. A method for operating the vibration control device for milling thin-walled parts as described in any one of claims 1-6, characterized in that, include: The rubber damper is attached to the workpiece via a vibration sensing sheet, and the inlet end of the flow channel is connected to the medium source via a flexible tube. During workpiece milling, vibration parameters of the workpiece are collected, and fluid medium is injected into the flow channel; Based on the collected vibration parameters, the motion parameters of the fluid medium are adjusted to reduce workpiece vibration.

8. The working method of the vibration control device for thin-walled part milling as described in claim 7, characterized in that, Adjusting the flow rate and velocity of the fluid medium within the flow channel to suppress workpiece vibration.

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