Active vibration reduction device and vibration reduction method for machine tool

Abstract

The present invention relates to an active vibration damping device and a vibration damping method for a machine tool, which, in order to machine a workpiece, changes in a vibration excitation unit by one of a fragile structure mode or a normal machining mode according to the type of vibration generated in real time during the driving process of an individual unit, and generates an excitation opposite to the vibration generated in the individual unit, thereby reducing the vibration generated in the individual unit by the one of the fragile structure mode and the normal machining mode. Vibration of individual units is actively reduced according to workpiece machining conditions.

Description

TECHNICAL FIELD

[0001] The present invention relates to an active damping device and damping method of a machine tool, and more particularly, to an active damping device and damping method of a machine tool in which, in order to process a workpiece, a vibration type generated in a unit during a driving process is changed and a vibration is generated in the opposite direction to the vibration generated in the unit by one of a fragile structure mode or a normal processing mode in a vibration unit, thereby actively reducing the vibration of the unit according to a processing situation of the workpiece. BACKGROUND

[0002] Generally, a machine tool refers to a machine used for the purpose of processing a workpiece of metal / non-metal into a desired shape and size by various cutting processing methods or non-cutting processing methods using a proper tool.

[0003] Various kinds of machine tools such as a turning center, a vertical / horizontal machining center, a portal machining center, a gang tool, an electric discharge machining machine, a horizontal NC drilling machine, a CNC lathe, etc. are widely used in various industrial sites according to the purpose of the corresponding work.

[0004] Generally, the various machine tools used at present have a control console to which a numerical control (NC) or computerized numerical control (CNC) technique is applied. Such a control console has various function switches or buttons and a monitor.

[0005] In addition, the machine tool has a transfer table for placing a workpiece, i.e., a material, and transferring the workpiece for processing, a pallet for preparing the workpiece before processing, a spindle combined with a tool or a workpiece to rotate, a tailstock for supporting the workpiece during processing, etc.

[0006] Generally, in the machine tool, the transfer table, the tool holder, the spindle, the tailstock, the damping device, etc. have a transfer unit transferred along a transfer axis to perform various processing.

[0007] In addition, generally, in order to perform various processing, the machine tool uses a plurality of tools, and uses a tool magazine or turret in the form of a tool storage place in which the plurality of tools are accommodated and stored.

[0008] Generally, in order to improve the productivity of the machine tool, the machine tool has an automatic tool changer (ATC) which extracts or re-accommodates a specific tool from a tool magazine by the command of a numerical control unit.

[0009] In addition, to minimize non-machining time, machine tools are generally equipped with an Automatic Palette Changer (APC). The APC automatically exchanges pallets between the workpiece machining area and the workpiece setting area. Workpieces can be loaded onto the pallets.

[0010] In addition, servo motors are generally used in machine tools to drive automatic tool changers (ATC), automatic pallet exchangers (APC), tailstocks, or anti-vibration devices.

[0011] Generally, machine tools can be divided into turning centers and machining centers. Machining centers use rotating cutting tools to machine workpieces. Conversely, turning centers use cutting tools to machine rotating workpieces.

[0012] Generally, machine tools such as machining centers consist of various individual units that are fixed or movable relative to other fixed or moving devices for machining workpieces. Specifically, they may include a bed fixed to the ground or base, and a saddle that can move horizontally, vertically, or vertically relative to these beds. Furthermore, a column is movable horizontally or vertically relative to the saddle, and a spindle is movable horizontally, vertically, or vertically relative to the column. Tools can be mounted at the front end of the spindle.

[0013] When a machine tool (e.g., spindle, column, or saddle) is running, the dynamic characteristics of each vibrating individual unit change with the position of the transfer axis. That is, the natural frequency (Hz) or compliance (μm / N) changes. Compliance can be interpreted as the amount of deformation that occurs when a unit force is applied. Therefore, in a weak vibration mode, increased vibration leads to reduced machining accuracy, an increased rate of defective products, resource waste, increased machining costs, and decreased productivity due to reduced cutting performance.

[0014] That is, for example, such as Figure 1 As shown, in a vertical machining center, when the spindle's Y-axis is 255mm, the Z-axis is 0mm (green solid line); when the Y-axis is 255mm, the Z-axis is 50mm (blue solid line); when the Y-axis is 255mm, the Z-axis is 100mm (red solid line); and when the Y-axis is 255mm, the Z-axis is 150mm (black solid line). When the Y-axis is in the same position, if the Z-axis transfer axis changes, the frequency (Hz) on the horizontal axis or the compliance on the vertical axis will change, thereby changing the dynamic characteristics of the machine tool or individual unit.

[0015] In addition, such as Figure 2As shown, when the Z-axis is located at the initial position as shown in B1, if the Z-axis is lowered by 200 mm as shown in B2, the rt value increases with the center axis, and the front end of the main shaft and the individual units are increased with the vibration, and the dynamic characteristics are changed, and thus the dynamic stiffness needs to be changed.

[0016] Thus, due to the mass component of the rotating body and the rotation speed, etc., vibration is inevitably generated in the rotating machine tool. In general, a system is introduced in which a mass component is additionally attached to the device in which vibration occurs to attenuate the vibration.

[0017] As is well known, this is a theory of canceling vibration by applying an equal force in the opposite direction to the size of the force transmitting the vibration. Den Hartog defined this tuned mass damper design theory as a motion equation in 1934. According to this theory, a device generating vibration can reduce vibration by installing a tuned mass damper having the same frequency characteristics as the resonance frequency of the device in the opposite direction.

[0018] However, the existing vibration reduction device and vibration reduction method of the machine tool are formed in a form in which only the individual unit of the machine tool vibrates with a fixed mass and frequency, and thus cannot actively cope with the real-time dynamic characteristics of the individual unit in which the vibration intensity and the vibration direction are changed in real time, and thus there is a problem in that a lot of cost and time is required to reduce the vibration of the machine tool, and the stability and reliability of the machine tool are reduced.

[0019] In order to solve the above problem, vibration reduction is sought by real-time excitation using an electromagnetic actuator.

[0020] Vibration generated when a material is processed can be divided into forced vibration caused by a change in cutting force when a tool cuts a material, and self-excited vibration generated due to a structural weakness of the machine tool.

[0021] That is, as shown in Figure 3 and Figure 4 If the existing vibration reduction device and vibration reduction method of the machine tool are used, it can be confirmed that the amplitude of the self-excited vibration shown in the front of the graph is reduced.

[0022] However, as shown in Figure 3 and Figure 4 It is shown that even if the existing vibration reduction device and vibration reduction method are used, vibration still exists in the normal processing state of the graph in the rear.

[0023] However, the existing vibration damping device and damping method for improving dynamic characteristic variation of a machine tool have a problem that only vibration caused by dynamic characteristic variation due to fragile structure vibration caused by self-excited vibration is actively reduced, and improvement of machining quality by effective vibration reduction under normal machining conditions of finish machining cannot be achieved.

[0024] In the milling process, high-precision machining and excellent surface quality cannot be achieved, which reduces the reliability and safety of the machine tool, and the number of defective products increases due to the deterioration of machining quality, which causes a waste of resources.

[0025] In addition, for ordinary workpieces with large machining error allowance, there is no problem, but as the modern machining trend requires precision machining, low tolerance, and excellent surface roughness, it is difficult to ensure the surface roughness.

[0026] Therefore, there is an urgent need for a technology that not only reduces dynamic stiffness characteristic variation caused by self-excited vibration, but also reduces vibration in real time under normal machining conditions of finish machining. SUMMARY

[0027] TECHNICAL PROBLEM

[0028] The present application is proposed to solve the above problems, and the purpose of the present application is to provide an active vibration damping device and damping method for a machine tool, which, in order to machine a workpiece, changes and generates excitation vibration opposite to the vibration generated in the individual unit according to the type of vibration generated in the individual unit during driving through one of a fragile structure mode or a normal machining mode, thereby actively reducing the vibration of the individual unit according to the machining of the workpiece, thereby improving the dynamic stiffness by vibration reduction in the fragile structure mode, improving the material removal rate during milling machining in the normal machining mode, and improving the machining surface quality during semi-finish machining or finish machining to maximize the machining accuracy of the machine tool and improve the safety and reliability of the machine tool, and by miniaturization of the excitation unit, not only the production cost and maintenance cost can be reduced, but also the space utilization can be maximized, the convenience of the operator can be achieved, and by modularization and compactness of the excitation unit, the manufacturing cost, the installation cost and the maintenance cost can be reduced, the non-machining time required for real-time active damping analysis can be minimized, and thus the machining productivity can be improved.

[0029] TECHNICAL SCHEME

[0030] In order to achieve the object of the present application, the active vibration reduction device of the machine tool according to the present application can include: an individual unit for driving the individual unit to process a workpiece; an exciting unit arranged on the individual unit to generate an exciting vibration when the individual unit is driven; and a control module for controlling the action of the exciting unit, wherein the control module, in order to process the workpiece, changes and generates the exciting vibration opposite to the vibration generated in the individual unit in the exciting unit according to the type of vibration generated in the individual unit in real time during driving, so as to actively reduce the vibration of the individual unit according to the processing condition of the workpiece.

[0031] In addition, in the preferred other embodiments of the active vibration reduction device of the machine tool according to the present application, the active vibration reduction device of the machine tool can further include: a sensing unit for sensing the vibration of the individual unit when the individual unit is driven; and a sensing unit for sensing the driving amount of the individual unit when the individual unit is driven.

[0032] In addition, in the preferred other embodiments of the active vibration reduction device of the machine tool according to the present application, the control module of the active vibration reduction device of the machine tool can include: a storage unit for storing data for actively reducing the vibration of the individual unit; a selection unit for comparing and analyzing the calculation value obtained by operating the sensing value sensed by the sensing unit, the driving amount sensed by the sensing unit and the data stored in the storage unit, so as to compare and analyze whether the vibration generated in real time during driving of the individual unit is fragile structure vibration or normal processing vibration, and select one mode from the fragile structure mode or the normal processing mode; a fragile structure exciting vibration calculation unit for calculating the intensity of the fragile structure exciting vibration that should be generated in the exciting unit based on the data stored in the storage unit when the selection result of the selection unit is to select the fragile structure mode; a normal processing exciting vibration calculation unit for calculating the intensity of the normal processing exciting vibration that should be generated in the exciting unit based on the data stored in the storage unit and the data of the selection unit when the selection result of the selection unit is to select the normal processing mode; and a processing unit for determining the direction of the fragile structure exciting vibration or the normal processing exciting vibration that should be generated in the exciting unit according to the data stored in the storage unit and the fragile structure exciting vibration value or the normal processing exciting vibration value calculated by the fragile structure exciting vibration calculation unit, and generating the fragile structure exciting vibration or the normal processing exciting vibration opposite to the individual unit according to the determination result, so as to actively reduce the fragile structure vibration or the normal processing vibration of the individual unit.

[0033] Moreover, in the preferred other embodiments of the active damping device of the machine tool according to the present application, the storage section of the active damping device of the machine tool can include: a basic data storage section for storing data on workpiece information, individual unit information, machining programs, and drive programs; a reference data storage section for storing data on reference values and gain values for each individual unit; a real-time data storage section for storing sensed values sensed by the sensing section and drive amounts sensed by the sensing section during driving of the individual units for machining of the workpiece; and a standard data storage section for storing standard machining vibration data at the time of normal machining vibration according to drive amounts of each individual unit.

[0034] Moreover, in the preferred other embodiments of the active damping device of the machine tool according to the present application, the selection section of the active damping device of the machine tool can include: a confirmation section for confirming whether the individual units are driven during machining of the workpiece; a detection section for detecting whether the individual units generate vibration based on data stored in the real-time data storage section when the individual units are driven as a result of confirmation by the confirmation section; a calculation section for calculating an operation value of vibration at a drive amount of the individual units based on data stored in the real-time data storage section and data stored in the standard data storage section when the individual units generate vibration as a result of detection by the detection section; a comparison section for comparing a reference value stored in data stored in the reference data storage section with the sensed value of the sensing section and the operation value of the calculation section; and a determination section for selecting a normal machining mode when the sensed value is the same as the operation value or the sensed value is smaller than the operation value, or the sensed value is smaller than the reference value, according to a comparison result of the comparison section, and for selecting a fragile structure mode when the sensed value is larger than the operation value and the sensed value exceeds the reference value as a result of comparison by the comparison section.

[0035] Moreover, in the preferred other embodiments of the active damping device of the machine tool according to the present application, the fragile structure excitation calculation section of the active damping device of the machine tool can include: a speed calculation section for calculating a speed of the individual units according to data stored in the basic data storage section and the reference data storage section when the fragile structure mode is selected by the determination section; a fragile structure excitation value calculation section for calculating a fragile structure excitation value that should be generated by the excitation unit according to a calculation result of the speed calculation section and data stored in the basic data storage section and the reference data storage section; and a fragile structure excitation current value calculation section for calculating a fragile structure excitation current value that should be transmitted to the excitation unit according to a calculation result of the fragile structure excitation value calculation section and data stored in the basic data storage section and the reference data storage section.

[0036] Moreover, in the preferred other embodiments of the active damping device of the machine tool according to the present application, the normal machining excitation calculation unit of the active damping device of the machine tool can include: a normal machining excitation value calculation unit, which calculates the normal machining excitation value that the excitation unit should generate according to the calculation value of the operation unit and the data stored in the standard data storage unit when the normal machining mode is selected by the determination unit; and a normal machining excitation current value calculation unit, which calculates the normal machining excitation current value that should be transmitted to the excitation unit according to the calculation result of the normal machining excitation value calculation unit and the data stored in the standard data storage unit.

[0037] Moreover, in the preferred other embodiments of the active damping device of the machine tool according to the present application, the processing unit of the active damping device of the machine tool can include: a judgment unit, which judges the direction of the excitation that the excitation unit should generate according to the sensing result of the sensing unit, the sensing result of the sensing unit, the selection result of the selection unit, the data stored in the storage unit, and the calculation result of the fragile structure excitation current value calculation unit or the calculation result of the normal machining excitation current value calculation unit; and a damping unit, which generates excitation with vibration intensity and vibration direction opposite to the vibration intensity and vibration direction of the fragile structure vibration or normal machining vibration of the individual unit in the excitation unit to actively reduce the fragile structure vibration or normal machining vibration of the individual unit according to the sensing result of the sensing unit, the sensing result of the sensing unit, the selection result of the selection unit, the judgment result of the judgment unit, and the data stored in the storage unit.

[0038] Moreover, in the preferred other embodiments of the active damping device of the machine tool according to the present application, the operation unit and the normal machining excitation value calculation unit of the active damping device of the machine tool can calculate the operation value and the normal machining excitation value by performing linear interpolation operation on the normal machining vibration data stored in the standard data storage unit according to the driving amount sensed by the sensing unit.

[0039] Moreover, in the preferred other embodiments of the active damping device of the machine tool according to the present application, the individual unit of the active damping device of the machine tool is a spindle that is rotationally driven when machining a workpiece, and the driving amount sensed by the sensing unit is the number of revolutions of the spindle.

[0040] Moreover, in the preferred other embodiments of the active damping device of the machine tool according to the present application, the excitation unit of the active damping device of the machine tool can include: a housing unit; a fixed unit, which is fixed to the housing unit and selectively forms an electromagnetic field; an actuator unit, which transmits the current applied to the fixed unit under the control of the control module; a guide unit, which is arranged on a part of the housing unit; and a vibration unit, which is slidably coupled to the guide unit so as to generate excitation when the current value applied by the actuator unit forms a specific electromagnetic field.

[0041] Moreover, in the preferred other embodiments of the active damping device of the machine tool according to the present application, the vibration exciting unit of the active damping device of the machine tool can further comprise a damper arranged between the housing part and the vibration part.

[0042] Moreover, in the preferred other embodiments of the active damping device of the machine tool according to the present application, the vibration exciting unit of the active damping device of the machine tool can be arranged in multiple individual units and generate multi-degree-of-freedom vibration excitation under the control of the control module.

[0043] In order to achieve other another object of the present application, the active damping method of the machine tool according to the present application can be, comprising: storing data, so that in order to process a workpiece, under the control of the control module, the vibration of the individual unit is actively reduced by changing and generating the vibration excitation opposite to the vibration generated in the individual unit in one of the fragile structure mode or the normal processing mode according to the type of vibration generated in the driving process of the individual unit; confirming whether the individual unit is in the driving state when processing the workpiece; when the individual unit is in the driving state, sensing the vibration of the individual unit; when the individual unit is in the driving state, sensing the driving amount of the individual unit; based on the confirmation result, the sensing result and the sensing result, detecting whether the individual unit vibrates in the driving process; when the vibration of the individual unit is detected, based on the driving amount of the individual unit and the stored data, calculating the operation value of the vibration generated according to the driving amount of the individual unit; comparing the reference value stored in the stored data, the sensing value based on the sensing result, and the operation value based on the operation result; according to the comparison result, if the sensing value is equal to the operation value or the sensing value is less than the operation value, or the sensing value is less than the reference value, the normal processing mode is selected, if the comparison result is that the sensing value is greater than the operation value, the sensing value exceeds the reference value, the fragile structure mode is selected; if the selection result is that the fragile structure mode is selected, calculating the intensity of the fragile structure excitation that the vibration exciting unit should generate according to the stored data and the selection result, if the selection result is that the normal processing mode is selected, calculating the intensity of the normal processing excitation that the vibration exciting unit should generate according to the stored data and the selection result; according to the sensing result, the sensing result, the confirmation result, the selection result, the calculation result and the stored data, judging the direction of the fragile structure excitation or the normal processing excitation that the vibration exciting unit should generate; and according to the sensing result, the sensing result, the confirmation result, the selection result, the calculation result, the judgment result and the stored data, the vibration exciting unit generates the vibration excitation with opposite vibration intensity and vibration direction to the fragile structure vibration or normal processing vibration of the individual unit, and actively reduces the fragile structure vibration or normal processing vibration of the individual unit in real time.

[0044] Inventive Effects

[0045] The active vibration reduction device and method of the machine tool according to the present application has the following effects: in order to process the workpiece, according to the vibration type generated in the individual unit during the driving process, the exciting unit changes and generates the exciting vibration opposite to the vibration generated in the individual unit through one of the fragile structure mode or the normal processing mode, so as to actively reduce the vibration of the individual unit according to the workpiece processing condition, thereby seeking to improve the dynamic stiffness through vibration reduction in the fragile structure mode, seeking to improve the material removal rate in the milling process in the normal processing mode, and seeking to improve the processing surface quality in the semi-finishing or finishing process, so as to maximize the machining accuracy of the machine tool and improve the safety and reliability of the machine tool.

[0046] The active vibration reduction device and method of the machine tool according to the present application has the following effects: according to the data stored in the storage unit and the fragile structure exciting value or normal processing exciting value calculated by the fragile structure exciting calculation unit, the direction of the fragile structure exciting or normal processing exciting generated by the exciting unit is judged, and according to the judgment result, the fragile structure exciting or normal processing exciting opposite to the individual unit is generated, so as to actively reduce the fragile structure vibration or normal processing vibration of the individual unit, and for this purpose, the fixed part and the vibration part of the exciting unit are realized in a sliding manner by using electromagnetism, so that the production cost and maintenance cost can be reduced through the miniaturization of the exciting unit, the space utilization is maximized, and the compactness of the machine tool is sought.

[0047] Further, the active vibration reduction device and method of the machine tool according to the present application has the following effects: the current and direction transmitted to the exciting unit are simply and quickly adjusted by the control module, so as to quickly and accurately automatically control the vibration intensity and vibration direction of the exciting vibration generated in the exciting unit, so as to minimize the non-processing time required for analysis and maintenance for vibration reduction according to the real-time change of the dynamic characteristic state on the individual unit, and the processing productivity can also be improved.

[0048] In addition, the active vibration reduction device and method of the machine tool according to the present application has the following effects: according to the change state of the size and intensity of the vibration generated in the individual unit, the control module and the exciting unit are automatically and actively damped, so as to seek the convenience of the staff, reduce the production cost, maintenance cost and time, and increase the export. BRIEF DESCRIPTION OF DRAWINGS

[0049] Figure 1 A chart showing the vibration generated by the existing machine tool when moving in Y-axis and Z-axis.

[0050] Figure 2 A conceptual diagram showing that the vibration increases when the position of the spindle Z-axis of the machine tool changes.

[0051] Figure 3 A graph showing a state in which vibration is not reduced in a state in which the active vibration reduction device and the vibration reduction method of the prior machine tool are not used.

[0052] Figure 4 A graph showing a state in which normal machining vibration is reduced in a state in which the active vibration reduction device and the vibration reduction method of the prior machine tool are used.

[0053] Figure 5 A conceptual diagram of a machine tool showing a state in which the active vibration reduction device according to the present application is provided.

[0054] Figure 6 A rear perspective view showing a state in which a base portion is removed in an excitation unit of the active vibration reduction device of the machine tool according to the present application.

[0055] Figure 7 A conceptual diagram showing that two-dimensional freedom vibration reduction is achieved in the active vibration reduction device of the machine tool according to the present application.

[0056] Figure 8 A block diagram showing a configuration of a control module of the active vibration reduction device of the machine tool according to the present application.

[0057] Figure 9 A flowchart showing the active vibration reduction method of the machine tool according to the present application.

[0058] Figure 10 A graph showing a state in which normal machining vibration is reduced in a state in which the active vibration reduction device and the vibration reduction method of the machine tool according to the present application are used.

[0059] Figure 11 A graph showing a state in which normal machining vibration is reduced in a state in which X-axis cutting is performed in a normal machining vibration mode in a state in which the active vibration reduction device and the vibration reduction method of the machine tool according to the present application are used.

[0060] Figure 12 A graph showing a state in which normal machining vibration is reduced in a state in which Y-axis cutting is performed in a normal machining vibration mode in a state in which the active vibration reduction device and the vibration reduction method of the machine tool according to the present application are used. DETAILED DESCRIPTION

[0061] Hereinafter, the active vibration reduction device and the vibration reduction method of the machine tool according to the embodiments of the present application will be described in detail with reference to the drawings. The embodiments described below are provided by way of example in order to fully convey the idea of the present application to those skilled in the art. Therefore, the present application is not limited to the embodiments described below, and can be embodied in other forms. Also, in the drawings, the size and thickness of the devices and the like can be exaggerated for convenience. Throughout the specification, the same reference numerals denote the same constituent elements.

[0062] Advantages, features and technical means to achieve these of the present application will be clear from the accompanying drawings and the following examples. However, the present application is not limited to the following examples, but can be embodied in various other forms. The present examples make the disclosure of the present application more complete, and provide a complete scope of the invention to those skilled in the art to which the present application belongs. Throughout the specification, the same symbols represent the same constituent elements. In order to clearly illustrate, the size and relative size of the layers and regions in the drawings can be exaggerated.

[0063] The terms used in the present specification are used to explain the examples, and do not limit the present application. In the present specification, the singular form also includes the plural form unless specifically mentioned. "Include" and / or "comprising" used in the specification means that the mentioned constituent elements, steps, actions and / or elements do not exclude the presence or addition of one or more other constituent elements, steps, actions and / or elements.

[0064] Figure 5 A conceptual diagram of a machine tool provided with a state of an active damping device according to the present application. Figure 6 A rear perspective view of a state in which a base portion is removed from an excitation unit of an active damping device of a machine tool according to the present application. Figure 7 A conceptual diagram of a state in which two-dimensional freedom vibration reduction can be achieved in an active damping device of a machine tool according to the present application. Figure 8 A block diagram of a structure of a control module of an active damping device of a machine tool according to the present application. Figure 9 A flowchart of an active damping method of a machine tool according to the present application. Figure 10 A graph showing a state in which normal machining vibration is reduced in a state in which an active damping device and a damping method of a machine tool according to the present application are adopted. Figure 11 A graph showing a state in which normal machining vibration is reduced in a state in which an active damping device and a damping method of a machine tool according to the present application are adopted when X-axis cutting is performed in a normal machining vibration mode. Figure 12 A graph showing a state in which normal machining vibration is reduced in a state in which an active damping device and a damping method of a machine tool according to the present application are adopted when Y-axis cutting is performed in a normal machining vibration mode.

[0065] The active damping device 1 of the machine tool according to the present application will be described with reference to Figures 5 to 8 and Figures 10 to 12 The active damping device 1 of the machine tool according to the present application will be described with reference to Figures 7 to 10 As shown in FIG. 1, the active damping device 1 of the machine tool according to the present application includes an individual unit 100, an excitation unit 200, a sensing unit 300, a sensing unit 400, and a control module 500.

[0066] The individual unit 100 is driven in order to machine a workpiece.

[0067] That is, generally, a machine tool includes a plurality of individual units which are fixed or movable with respect to other fixed or movable devices for processing a workpiece. As an example, a bed 10 fixed to the ground or a base can be provided, and a saddle 20 which is horizontally, vertically, or height directionally movable with respect to the bed can be provided. Also, a column 30 which is horizontally, vertically, or height directionally movable with respect to the saddle can be provided, and a spindle 40 which is horizontally or vertically or height directionally movable with respect to the column can be provided, and a tool 50 which is rotatably installed at a front end of the spindle can be provided, and the workpiece is processed by the rotating tool. In this case, the machine tool, in order to process the workpiece, in a processing or non-processing state, the spindle, the saddle, the column which constitute the individual units are moved or the tool is rotated, and vibration is caused due to a change in dynamic characteristics. Also, a transfer unit which transfers each of the individual units in an axial direction is provided, and the transfer unit can be operated by another control device for controlling the machine tool. Although not shown, the transfer unit performs a function of transferring the saddle, the column, the spindle. The transfer unit can be composed of a ball screw, a linear guide rail, and a linear guide block. Also, the linear guide rail can be formed of an LM guide rail.

[0068] A vibration exciting unit 200 is arranged on each of the individual units to generate a vibration excitation when the individual units are driven.

[0069] A sensing unit 300 senses a vibration of the individual units when the individual units are driven. That is, the sensing unit is arranged adjacent to a vibration generating portion of the individual unit in which the vibration exciting unit is arranged, and senses the vibration of the individual unit. When the vibration generating portion of the individual unit in which the vibration exciting unit is arranged is plural, the sensing unit can be arranged in a portion in which the vibration is most generated, or a plurality of sensing units can be arranged in the vibration generating portion.

[0070] A sensing unit 400 senses a driving amount of the individual units when the individual units are driven.

[0071] According to an embodiment of the present application, the individual unit is a spindle which is rotationally driven when a workpiece is processed, and the driving amount sensed by the sensing unit can be a rotation speed of the spindle.

[0072] A control module 500 controls an operation of the vibration exciting unit. That is, the control module, in order to process a workpiece, changes and generates a vibration excitation which is opposite to a vibration generated in the individual unit by one of a fragile structure mode or a normal processing mode according to a type of the vibration which is generated in real time during driving of the individual unit, and thus actively reduces the vibration of the individual unit according to a processing situation of the workpiece.

[0073] Thus, the active vibration reduction device of the machine tool according to the present application, in order to process the workpiece, according to the vibration type generated in real time in the driving process of the individual unit, changes and generates the exciting vibration opposite to the vibration generated in the individual unit in one of the fragile structure mode or the normal processing mode in the exciting unit, so as to actively reduce the vibration of the individual unit according to the processing condition of the workpiece, and in the fragile structure mode, the improvement of the dynamic stiffness is sought through the vibration reduction, and in the normal processing mode, the material removal rate is sought to be improved in the milling process, and the processing surface quality is sought to be improved in the semi-finishing or finishing, so as to maximize the machining accuracy of the machine tool, and improve the safety and reliability of the machine tool.

[0074] In addition, although not shown, the control module of the active vibration reduction device of the machine tool according to the present application is provided with a PLC. The PLC (Programmable Logic Controller) communicates with the spindle, the column, the bed saddle and its moving part, the control module and the like according to a predetermined protocol, and plays a function of executing the control command through the communication. That is, the PLC drives the spindle, the column, the moving part of the bed saddle, the spindle rotation, the tool magazine and the like according to the numerical control program of the control module.

[0075] In addition, although not shown, according to a preferred embodiment of the present application, the control module includes a main operation part including a screen display program and a data input program selected according to the screen display, and according to the output of the screen display program, a software switch is displayed on the display screen, the ON / OFF state of the software switch is identified, and the function of issuing the input / output command of the machine operation is executed.

[0076] In addition, although not necessarily limited thereto, the main operation part is installed on the housing, the box or one side of the machine tool, and includes various function switches or buttons and a monitor capable of displaying various information.

[0077] As Figure 8 shown, the control module 500 of the active vibration reduction device 1 of the machine tool according to the present application includes a storage part 510, a selection part 520, a fragile structure exciting calculation part 530, a normal processing exciting calculation part 540 and a processing part 550.

[0078] The storage part 510 stores data for actively reducing the vibration of the individual unit. That is, the storage part stores basic data, reference data, real-time data and standard data, which are used to actively reduce the vibration of the individual unit according to the vibration type generated in real time in the driving process of the individual unit, change and generate the exciting vibration opposite to the vibration generated in the individual unit in one of the fragile structure mode or the normal processing mode in the exciting unit, so as to actively reduce the vibration of the individual unit.

[0079] The selection section 520 compares and analyzes the sensed value sensed by the sensing section, the drive amount sensed by the sensing section, and the operation value obtained by operating the data stored in the storage section, to compare and analyze whether the vibration generated in real time when the individual unit is driven is the fragile structure vibration or the normal machining vibration, and selects one mode between the fragile structure mode and the normal machining mode.

[0080] When the selection result of the selection section is the selection of the fragile structure mode, the fragile structure excitation calculation section 530 calculates the intensity of the fragile structure excitation that should be generated in the excitation unit, based on the data stored in the storage section.

[0081] When the selection result of the selection section is the selection of the normal machining mode, the normal machining excitation calculation section 540 calculates the intensity of the normal machining excitation that should be generated in the excitation unit, based on the data stored in the storage section and the data of the selection section.

[0082] The processing section 550 determines the direction of the fragile structure excitation or the normal machining excitation that should be generated in the excitation unit, based on the data stored in the storage section and the fragile structure excitation value or the normal machining excitation value calculated by the fragile structure excitation calculation section, and generates the fragile structure excitation or the normal machining excitation opposite to the individual unit according to the determination result, to actively reduce the fragile structure vibration or the normal machining vibration of the individual unit.

[0083] As shown in FIG. 1, the control module 500 of the active vibration reduction device 1 of the machine tool according to the present application includes a storage section 510, a selection section 520, a fragile structure excitation calculation section 530, a normal machining excitation calculation section 540, and a processing section 550. Figure 8

[0084] The basic data storage section 511 is used to store the data about the workpiece information, the individual unit information, the machining program, and the drive program.

[0085] The reference data storage section 512 is used to store the data about the reference value and the gain value of each individual unit.

[0086] The real-time data storage section 513 is used to store the sensed value sensed by the sensing section and the drive amount sensed by the sensing section in the process of driving the individual unit for machining the workpiece.

[0087] The standard data storage section 514 is used to store the standard machining vibration data when the normal machining vibration according to the drive amount of the individual unit.

[0088] As shown in FIG. 1, the control module 500 of the active vibration reduction device 1 of the machine tool according to the present application includes a storage section 510, a selection section 520, a fragile structure excitation calculation section 530, a normal machining excitation calculation section 540, and a processing section 550. Figure 8 ​As shown, the selection unit 520 of the control module 500 of the active vibration damping device 1 of the machine tool according to the present invention includes: a confirmation unit 521, a detection unit 522, a calculation unit 523, a comparison unit 524, and a determination unit 525.

[0089] The confirmation unit 521 is used to confirm whether the individual unit is driven when processing the workpiece.

[0090] Based on the confirmation result of the confirmation unit, when the individual unit is driven, the detection unit 522 detects whether the individual unit vibrates based on the data stored in the real-time data storage unit.

[0091] Based on the detection results of the detection unit, when the individual unit is driven to detect vibration, the calculation unit 523 calculates the vibration value under the driving amount of the individual unit based on the data stored in the real-time data storage unit and the data stored in the standard data storage unit.

[0092] The comparison unit 524 compares the reference value stored in the data stored in the reference data storage unit with the sensing value of the sensing unit and the calculation value of the calculation unit.

[0093] Based on the comparison result of the comparison unit, the determination unit 525 selects the normal processing mode when the sensed value is the same as the calculated value, or the sensed value is less than the calculated value, or the sensed value is less than the reference value; and selects the fragile structure mode when the comparison result of the comparison unit indicates that the sensed value is greater than the calculated value or the sensed value exceeds the reference value.

[0094] like Figure 8 As shown, the vulnerable structure excitation calculation unit 530 of the control module 500 of the active vibration damping device 1 of the machine tool according to the present invention includes: a speed calculation unit 531, a vulnerable structure excitation value calculation unit 532 and a vulnerable structure excitation current value calculation unit 533.

[0095] When the speed calculation unit 531 selects a vulnerable structure mode through the determination unit, it calculates the speed of the individual unit based on the data stored in the basic data storage unit and the reference data storage unit.

[0096] The fragile structure excitation value calculation unit 532 calculates the fragile structure excitation value that the excitation unit should generate based on the calculation results of the velocity calculation unit, the data stored in the basic data storage unit and the reference data storage unit.

[0097] The fragile structure excitation current value calculation unit 533 calculates the fragile structure excitation current value to be transmitted to the excitation unit based on the calculation results of the fragile structure excitation current value calculation unit, the data stored in the basic data storage unit and the reference data storage unit.

[0098] like Figure 8As shown, the normal machining excitation calculation unit 540 of the control module 500 of the active vibration damping device 1 of the machine tool according to the present invention includes: a normal machining excitation value calculation unit 541 and a normal machining excitation current value calculation unit 542.

[0099] The normal processing excitation value calculation unit 541 calculates the normal processing excitation value that the excitation unit should generate based on the calculation value of the calculation unit and the data stored in the standard data storage unit when the normal processing mode is selected by the determination unit.

[0100] The normal processing excitation current value calculation unit 542 calculates the normal processing excitation current value to be transmitted to the excitation unit based on the calculation results of the normal processing excitation current value calculation unit and the data stored in the standard data storage unit.

[0101] According to an embodiment of the present invention, the calculation unit and the normal processing excitation value calculation unit can calculate the calculated value and the normal processing excitation value by linear interpolation of the standard processing vibration data stored in the standard data storage unit based on the driving amount sensed by the sensing unit. Therefore, even in the case of insufficient data, the excitation value can be calculated and the current value generated by normal processing excitation can be generated to actively reduce normal processing excitation.

[0102] like Figure 8 As shown, the processing unit 550 of the control module 500 of the active vibration damping device 1 of the machine tool according to the present invention includes: a judgment unit 551 and a vibration damping unit 552.

[0103] The determination unit 551 determines the direction of the excitation that the excitation unit should generate based on the sensing result of the sensing unit, the sensing result of the sensing unit, the selection result of the selection unit, the data stored in the storage unit, the calculation result of the fragile structure excitation current value calculation unit, or the calculation result of the normal processing excitation current value calculation unit.

[0104] The vibration damping unit 552 generates an excitation in the excitation unit that has a vibration intensity and direction opposite to the fragile structural vibration or normal processing vibration of the individual unit, based on the sensing results of the sensing unit, the selection results of the selection unit, the judgment results of the judgment unit, and the data stored in the storage unit, so as to actively reduce the fragile structural vibration or normal processing vibration of the individual unit in real time.

[0105] like Figure 10 As shown, comparing (a) before and (b) after using the active vibration damping device and method of the machine tool according to the present invention, it can be seen that normal machining vibration is reduced.

[0106] In addition, such as Figures 11 to 12As shown, a comparison will be made between the active vibration damping device and vibration damping method of the machine tool according to the present invention before ( Figures 11 to 12 (as shown in the above figure) and after using the active vibration damping device and vibration damping method of the machine tool according to the present invention ( Figures 11 to 12 As shown in the figure below, it can be confirmed that normal machining vibration is reduced by more than 85% in both the X and Y axes.

[0107] Thus, according to the active vibration reduction device and method of the machine tool of the present invention, in order to process the workpiece, according to the type of vibration generated in real time by the individual unit during the driving process, the excitation unit is changed through either the vulnerable structure mode or the normal machining mode to generate an excitation opposite to the vibration generated in the individual unit. Therefore, the vibration of the individual unit is actively reduced according to the workpiece processing situation. Thus, in the vulnerable structure mode, the dynamic stiffness is improved by reducing vibration. In the normal machining mode, the material removal rate is improved during milling, and the surface quality is improved during semi-finishing or finishing, so as to maximize the machining accuracy of the machine tool and improve the safety and reliability of the machine tool.

[0108] Therefore, the active vibration damping device for machine tools according to the present invention can easily and quickly adjust the current and direction transmitted to the excitation unit through the control module, and quickly and accurately automatically control the vibration intensity and direction of the excitation generated by the excitation unit. Thus, based on the real-time changing dynamic characteristics of the individual unit, the non-processing time caused by vibration damping analysis and maintenance can be minimized, thereby improving processing productivity.

[0109] like Figures 7 to 9 As shown, the excitation unit 200 of the active vibration damping device for a machine tool according to the present invention includes: a housing part 210, a fixing part 220, a vibration part 230, a guide part 240, an actuator unit 250, and a damper 260.

[0110] The housing portion 210 forms the shape of the excitation unit and provides space for mounting the fixing part, actuator unit, vibrating part, and guide part. Preferably, the housing portion 210 includes a plate-shaped base portion 211 connected to the individual unit, and support portions 212 extending vertically from both sides of the base portion to support the fixing part and the guide part. That is, the base portion is formed in a generally rectangular plate shape, and the support portions extend vertically from both sides of the base portion to provide space for the fixing part and the guide part to be combined and fixed to the housing portion.

[0111] The fixing part 220 is fixedly mounted on the housing part and selectively forms an electromagnetic field. Preferably, the fixing part 220 includes a stator core 221 fixedly attached to the support part on both sides, and a stator 222 with a coil wound around the outer peripheral surface of the stator core. That is, the stator core is formed as a square or round rod with a predetermined length in the horizontal direction, and the coil is wound around the stator core a predetermined number of turns, so that current flows through the stator core and an electromagnetic field is formed according to the current value signal transmitted through the processing part of the vibration damping part.

[0112] The vibrating part 230 is slidably connected to the guide part, so that when a specific electromagnetic field is formed by the current value applied through the actuator unit, excitation is generated.

[0113] Additionally, preferably, the vibrating part 230 includes: a sliding part 231 that internally accommodates a fixed part formed by the stator core and the stator and is formed to have a predetermined weight; and a permanent magnet 232 that is fixed to the inner surface of the sliding part at a predetermined interval from the stator. The sliding part may be formed in a generally cuboid or cubic shape with a hollow cavity.

[0114] The actuator unit 250 transmits current applied to the fixed part under the control of the control module. That is, the actuator unit 250 is arranged in part of the base or support section, and transmits current applied to the fixed part according to a signal sent through the processing unit, thereby causing the current to flow through the coil wound on the stator to form an electromagnetic field. Furthermore, the actuator unit includes and may include a vibration sensor. This vibration sensor can be formed from an acceleration sensor or the like.

[0115] The guide portion 240 is mounted on a portion of the housing portion. Preferably, the guide portion 240 includes: a guide rail portion 241, connected to the support portion on both sides parallel to the stator core; and a block portion 242, formed on the outer side of the sliding portion to guide its movement, sliding along the guide rail portion.

[0116] The damper 260 is arranged between the housing and the vibrating part to reduce vibrations that occur during sliding movement of the sliding part and to prevent damage to the sliding part, etc.

[0117] Thus, in the active vibration damping device for machine tools according to the present invention, the fixed part and the vibrating part of the excitation unit are configured to slide via an electromagnet, so that the excitation unit accurately and quickly generates an excitation whose magnitude and direction are opposite to the vibration data of the individual unit sensed by the sensing part, thereby reducing the vibration occurring on the individual unit in real time and actively. As a result, by miniaturizing the excitation unit, not only can production and maintenance costs be reduced, but space utilization can also be maximized, and the machine tool can be made more compact.

[0118] In addition, the machine tool's active vibration damping device has multiple excitation units on a single unit, so that multi-degree-of-freedom excitation can be generated under the control of the control module.

[0119] That is, such as Figure 9 As shown, in the active vibration reduction device for a machine tool according to another embodiment of the present invention, the first excitation unit 201 and the second excitation unit 202 in the excitation unit 200' are arranged in a cross configuration. The first excitation unit generates an excitation opposite to the Y-axis direction for the vibration of the individual unit in the Y-axis direction, and the second excitation unit generates an excitation opposite to the Z-axis direction for the vibration of the individual unit in the Z-axis direction. This results in the excitation generated on the excitation unit also having two degrees of freedom for the two-degree-of-freedom vibration of the individual unit. Thus, multi-degree-of-freedom vibration of the individual unit can be actively, rapidly and automatically generated to actively reduce vibration.

[0120] Reference Figure 10 The active vibration reduction method for a machine tool according to the present invention is described. The active vibration reduction method for a machine tool according to the present invention includes: a data storage step (S1), a confirmation step (S2), a sensing step (S3), a sensing step (S4), a detection step (S5), a calculation step (S6), a comparison step (S7), a selection step (S8), vibration calculation for fragile structures (S9-1), vibration calculation for normal structures (S9-1), a judgment step (S10), and a vibration reduction step (S11).

[0121] The overall working principle, control method, and equipment composition of the active vibration reduction method for machine tools according to the present invention are the same as those of the active vibration reduction device for machine tools described above. The differences will be highlighted below.

[0122] The stored data enables the vibration of the individual unit to be actively reduced by changing the excitation unit and generating an excitation opposite to the vibration generated in the individual unit in real time during the operation of the individual unit, based on the type of vibration generated in real time during the operation of the individual unit. This is achieved by altering the excitation unit through either a fragile structure mode or a normal processing mode.

[0123] After the data storage step (S1), when processing the workpiece, it is confirmed whether the individual unit is in a driving state.

[0124] After the confirmation step (S2), the confirmation result is that when the individual unit is driven, the vibration of the individual unit is sensed.

[0125] After the sensing step (S3), when the result confirms that the individual unit is driven, the driving amount of the individual unit is sensed.

[0126] After the sensing step (S4), based on the confirmation result, the sensing result, and the sensing result, it is detected whether the individual unit vibrates during the drive.

[0127] After the detection step (S5), when the vibration of the individual unit is detected, the calculated value of the vibration generated according to the driving amount of the individual unit is calculated based on the driving amount of the individual unit and the stored data.

[0128] After the calculation step (S6), the reference value stored in the stored data, the sensing value based on the sensing result, and the calculated value based on the calculation result are compared.

[0129] After the comparison step (S8), based on the comparison result, if the sensed value is equal to the calculated value, or the sensed value is less than the calculated value, or the sensed value is less than the reference value, then the normal processing mode is selected; if the comparison result shows that the sensed value is greater than the calculated value, or the sensed value exceeds the reference value, then the fragile structure mode is selected.

[0130] After the selection step (S9), if the selection result is that the fragile structure mode is selected, the intensity of the fragile structure excitation that the excitation unit should generate is calculated based on the stored data and the selection result. If the selection result is that the normal processing mode is selected, the intensity of the normal processing excitation that the excitation unit should generate is calculated based on the stored data and the selection result.

[0131] After the fragile structure excitation calculation (S9-1) or normal structure excitation calculation (S9-2), based on the sensing results, detection results, confirmation results, selection results, calculation results and stored data, determine the direction of the fragile structure excitation or normal processing excitation that the excitation unit should generate.

[0132] After the judgment step (S10), based on the sensing result, the detection result, the confirmation result, the selection result, the calculation result, the judgment result and the stored data, the excitation unit generates an excitation with the opposite vibration intensity and vibration direction to the fragile structural vibration or normal processing vibration of the individual unit, and actively reduces the fragile structural vibration or normal processing vibration of the individual unit in real time.

[0133] In the detailed description of the present invention described above, preferred embodiments have been referenced. However, it should be understood that various modifications and alterations can be made to the present invention by those skilled in the art or those with ordinary knowledge in the art, without departing from the spirit and technical scope of the invention as described in the claims. Therefore, the technical scope of the present invention is not limited to the contents described in the detailed description, but is determined by the scope of the claims.

[0134] Symbol Explanation

[0135] 1: Active vibration damping device; 100: Individual unit; 200: Excitation unit; 300: Sensing unit; 400: Sensor unit; 500: Control module.

Claims

1. An active vibration damping device for a machine tool, characterized in that, include: Individual unit, driving the individual unit to process the workpiece; An excitation unit is arranged on the individual unit to generate excitation when the individual unit is driven; as well as The control module is used to control the operation of the excitation unit. In order to process the workpiece, the control module, based on the vibration type generated in real time by the individual unit during the driving process, changes the excitation unit through either a fragile structure mode or a normal processing mode and generates an excitation that is opposite to the vibration generated in the individual unit, thereby actively reducing the vibration of the individual unit according to the workpiece processing situation.

2. The active vibration damping device for machine tools according to claim 1, characterized in that, Also includes: A sensing unit is used to sense the vibration of the individual unit when the individual unit is driven; as well as The sensing unit is used to sense the driving amount of the individual unit when the individual unit is driven.

3. The active vibration damping device for machine tools according to claim 2, characterized in that, The control module includes: The storage unit stores data used to actively reduce the vibration of the individual units; The selection unit compares and analyzes the sensed value sensed by the sensing unit, the driving amount sensed by the sensing unit, and the calculated value obtained by the data stored in the storage unit, so as to compare and analyze whether the vibration generated in real time in the individual unit drive is a fragile structure vibration or a normal processing vibration, and selects a mode in the fragile structure mode or the normal processing mode. The fragile structure excitation calculation unit calculates the intensity of the fragile structure excitation that should be generated in the excitation unit based on the data stored in the storage unit when the selection result of the selection unit is a fragile structure mode. The normal machining excitation calculation unit, when the selection result of the selection unit indicates that the normal machining mode has been selected, calculates the intensity of the normal machining excitation that should be generated in the excitation unit based on the data stored in the storage unit and the data of the selection unit; and The processing unit determines the direction of the fragile structure excitation or normal processing excitation that should be generated in the excitation unit based on the data stored in the storage unit and the fragile structure excitation calculation unit calculated by the fragile structure excitation calculation unit, and generates a fragile structure excitation or normal processing excitation opposite to that of the individual unit based on the determination result, so as to actively reduce the fragile structure vibration or normal processing vibration of the individual unit.

4. The active vibration damping device for machine tools according to claim 3, characterized in that, The storage unit includes: The basic data storage unit is used to store data related to workpiece information, individual unit information, machining programs, and driver programs. The reference data storage unit is used to store data related to the reference value and the gain value of each individual unit; A real-time data storage unit is used to store the sensing values ​​sensed by the sensing unit and the driving quantity sensed by the sensing unit during the process of driving the individual unit for machining the workpiece; and The standard data storage unit is used to store standard machining vibration data during normal machining, based on the driving amount of each individual unit.

5. The active vibration damping device for machine tools according to claim 4, characterized in that, The selection unit includes: The confirmation unit is used to confirm whether the individual unit is driven during workpiece processing. The detection unit, based on the confirmation result of the confirmation unit and the data stored in the real-time data storage unit, detects whether the individual unit vibrates when the individual unit is driven; The calculation unit, based on the detection results of the detection unit and the vibration detected when the individual unit performs an action, calculates the vibration value under the driving amount of the individual unit according to the data stored in the real-time data storage unit and the data stored in the standard data storage unit. The comparison unit compares the reference value stored in the reference data storage unit with the sensed value of the sensing unit and the calculated value of the calculation unit; and The determination unit selects the normal processing mode when the sensed value is the same as the calculated value, the sensed value is less than the calculated value, or the sensed value is less than the reference value, based on the comparison result of the comparison unit. When the sensed value is greater than the calculated value or the sensed value exceeds the reference value, the fragile structure mode is selected.

6. The active vibration damping device for machine tools according to claim 5, characterized in that, The vibration calculation unit for the fragile structure includes: The speed calculation unit calculates the speed of the individual unit based on the data stored in the basic data storage unit and the reference data storage unit when the determination unit selects a vulnerable structure mode. The fragile structure excitation value calculation unit calculates the fragile structure excitation value that the excitation unit should generate based on the calculation results of the velocity calculation unit, the data stored in the basic data storage unit, and the data stored in the reference data storage unit; and The fragile structure excitation current value calculation unit calculates the fragile structure excitation current value that should be transmitted to the excitation unit based on the calculation results of the fragile structure excitation current value calculation unit, the data stored in the basic data storage unit and the reference data storage unit.

7. The active vibration damping device for machine tools according to claim 6, characterized in that, The normal processing vibration calculation unit includes: The normal processing excitation value calculation unit, when the normal processing mode is selected by the determination unit, calculates the normal processing excitation value that the excitation unit should generate based on the calculation value of the calculation unit and the data stored in the standard data storage unit; and The normal processing excitation current value calculation unit calculates the normal processing excitation current value to be transmitted to the excitation unit based on the calculation results of the normal processing excitation current value calculation unit and the data stored in the standard data storage unit.

8. The active vibration damping device for machine tools according to claim 7, characterized in that, The processing unit includes: The judgment unit determines the direction of the excitation that the excitation unit should generate based on the sensing results of the sensing unit, the selection results of the selection unit, the data stored in the storage unit, and the calculation results of the fragile structure excitation current value calculation unit, or the calculation results of the normal processing excitation current value calculation unit; and The vibration damping unit generates an excitation unit in the excitation unit that has a vibration intensity and direction opposite to the fragile structural vibration or normal processing vibration of the individual unit, based on the sensing results of the sensing unit, the selection results of the selection unit, the judgment results of the judgment unit, and the data stored in the storage unit, so as to actively reduce the fragile structural vibration or normal processing vibration of the individual unit.

9. The active vibration damping device for machine tools according to claim 7, characterized in that, The calculation unit and the normal processing excitation value calculation unit can calculate the calculated value and the normal processing excitation value by performing linear interpolation on the standard processing vibration data stored in the standard data storage unit based on the driving amount sensed by the sensing unit.

10. The active vibration damping device for machine tools according to claim 2, characterized in that, The individual unit is a spindle that is rotated during workpiece processing. The driving quantity sensed by the sensing unit is the spindle rotation number.

11. The active vibration damping device for machine tools according to claim 1, characterized in that, The excitation unit includes: Shell section; A fixing part, fixed to the housing part, selectively forms an electromagnetic field; The actuator unit transmits the current applied to the fixed part under the control of the control module; A guide portion is provided on a part of the housing portion; and The vibrating part is slidably connected to the guide part, so that excitation is generated when a specific electromagnetic field is formed by the current value applied through the actuator unit.

12. The active vibration damping device for a machine tool according to claim 11, characterized in that, The excitation unit also includes a damper disposed between the housing portion and the vibrating portion.

13. The active vibration damping device for machine tools according to claim 1, characterized in that, Multiple excitation units are arranged in a single unit and generate multi-degree-of-freedom excitation under the control of the control module.

14. An active vibration reduction method for a machine tool, characterized in that, include: The process of storing data enables the active reduction of the vibration of an individual unit by changing the excitation unit and generating an excitation opposite to the vibration generated in the individual unit in real time during the drive process, based on the type of vibration generated by the individual unit in real time during the drive process. The step of confirming whether the individual unit is in a driving state when processing a workpiece; The step of sensing the vibration of the individual unit when the result is confirmed to be driven by the individual unit; The step of sensing the driving amount of the individual unit when the confirmation result is that the individual unit is driven; Based on the confirmation results, sensing results, and detection results, the step of detecting whether the individual unit vibrates during the drive; The detection result is that when the vibration of the individual unit is detected, the step of calculating the vibration value generated according to the driving amount of the individual unit and the stored data is as follows: The steps of comparing the reference value stored in the stored data, the sensed value based on the sensed result, and the calculated value based on the calculation result; Based on the comparison results, if the sensed value is equal to the calculated value, less than the calculated value, or less than the reference value, then the normal processing mode is selected; if the comparison results show that the sensed value is greater than the calculated value or exceeds the reference value, then the fragile structure mode is selected. If the selection result is a fragile structure mode, then the intensity of the fragile structure excitation that the excitation unit should generate is calculated based on the stored data and the selection result. If the selection result is a normal processing mode, then the intensity of the normal processing excitation that the excitation unit should generate is calculated based on the stored data and the selection result. The steps for determining the direction of vibration of the fragile structure or normal processing that the excitation unit should generate based on the sensing results, confirmation results, selection results, calculation results and stored data; as well as Based on the sensing results, confirmation results, selection results, calculation results, judgment results, and stored data, the step of generating an excitation unit that has the opposite vibration intensity and direction to the fragile structural vibration or normal processing vibration of the individual unit, and actively reducing the fragile structural vibration or normal processing vibration of the individual unit in real time.

Images