TW201733733A - Chatter avoid system - Google Patents

Abstract

A chatter avoid system is described, which can be disposed on a machine tool. The machine tool includes a spindle, a tool holder and a cutting tool. The chatter avoid system includes a vibration sensor which is configured to generate a vibration signal of the cutting tool, a controlling device which is configured to operate the spindle according to a control signal, a chatter avoid module and an operating display device which is configured to input parameters and display information. The chatter avoid module includes a structure database which stores plural character data of cutting tools and tool holders and a tool and holder coupling unit and a process control module. The tool and holder coupling unit can create a structure character parameter. The process control module includes a parameter-setting unit which is configured to set manufacturing parameters and a chatter judge & information processing unit. The chatter judge & information processing unit is configured to generate a chatter information according to the manufacturing parameters, the structure character parameters, the vibration signal and the control signal.

Description

Cutting chatter avoidance system

The present invention relates to a cutting chatter avoidance system, and more particularly to a cutting chatter avoidance system that can be applied to a processing machine and that eliminates the chattering vibration generated by the processing machine.

In the cutting process of a general processing machine, if the machining conditions are set improperly, the cutting chattering will occur. Cutting chatter is a process instability caused by tool vibration, and chattering often leaves a chattering knife mark on the surface of the workpiece, resulting in poor quality of the machined surface. On the other hand, the tool will also accelerate the wear due to machining and vibration on uneven surfaces, resulting in damage to the tool or workpiece.

Accordingly, it is an object of the present invention to provide a cutting dither avoidance system that can generate corresponding dither avoidance control messages based on different tool holders and tool configuration characteristics and process parameters on the processing machine to eliminate processing machines. The resulting cutting chatter.

According to the above object of the present invention, a cutting chatter avoidance system is proposed. This cutting chatter avoidance system is mainly used to eliminate the production of a processing machine The raw cutting vibration. Wherein, the processing machine has a main shaft, and the main shaft is provided with a knife handle and a cutter. The cutting chatter avoidance system includes a vibration detecting device, a control device, a dither avoidance module, and an operation and display module. The vibration detecting device is mounted on the main shaft and configured to detect the vibration of the tool and generate a vibration signal. The control unit is electrically coupled to the spindle and configured to generate control signals to manipulate the spindle and provide immediate cutting information. The dither avoidance module is electrically connected to the vibration detecting device and the control device. The dither avoidance module includes a structural database and a process control module. The structural database stores a plurality of tool property data and a plurality of tool bar characteristics data. The structural database includes a coupling analysis unit for the tool and the tool holder parameter, and the tool and the tool parameter coupling analysis unit are configured to select the tooling characteristic data and the tool characteristic data from the structural database to generate the structural characteristic parameter. The process control module includes a parameter setting unit and a dither determination and information processing unit. The parameter setting unit is configured to set process parameters according to an operation signal. The dither determination and information processing unit is configured to generate a trembling information based on process parameters, structural characteristic parameters, vibration signals, and control signals. The operation and display module is electrically connected to the dither avoidance module and the vibration detecting device. The operation and display module includes an operation device and a display device. The operating device is configured to select or input parameters. The display device is configured to display trembling information.

According to an embodiment of the invention, the trembling information includes trembling steady state information and modulation suggestion information.

According to still another embodiment of the present invention, the modulation suggestion information includes a spindle speed recommendation value and a cutting depth recommendation value.

According to another embodiment of the present invention, the above-described dither determination and information processing unit may further convert the trembling information into a modulated signal and transmit To the control unit. After the control device receives the modulation signal, the control device can control the spindle according to the modulation signal.

In accordance with still another embodiment of the present invention, each of the tool characteristic data includes a rigidity, a material, an outer diameter, and/or a number of edges of the tool.

According to still another embodiment of the present invention, the tremor avoidance module further includes a finite element analysis module. This finite element analysis module is configured to create and store tool property data in a structural database.

In accordance with still another embodiment of the present invention, each of the tool tip characteristics includes the rigidity of the tool holder, the material and/or the tool holder being disposed on the dynamic rigidity of the spindle.

According to still another embodiment of the present invention, the control signal includes a spindle rotational speed, a cutting depth, and a cutting feed rate.

According to still another embodiment of the present invention, the vibration detecting device is configured to further convert the vibration signal into an instantaneous vibration graph. Moreover, the display device can display the aforementioned instantaneous vibration profile.

It can be seen from the above that the cutting chatter avoidance system of the present invention can mainly generate the vibration information according to the vibration signal generated by the tool during processing, the instantaneous process parameters during processing, and the structural characteristic parameters set by the operator to provide processing. The machine automatically adjusts its process parameters to achieve the effect of avoiding chatter. In other use cases, the operator can also directly adjust the process parameters of the processing machine by directly referring to the trembling information.

In addition, the structural database of the present invention mainly stores a plurality of different types of tool holders and tool characteristic data, and provides an operator to select and set the tool and the tool holder used by the processing machine. Thereby, when the chattering occurs, the vibration The judgment and information processing unit can generate corresponding trembling information according to the different structural parameters of the tool holder and the tool, and the relevant process conditions at the time of the occurrence of the chattering, thereby improving the accuracy of the trembling information. Under other conditions of use, the chattering judgment and information processing unit can also calculate the optimal processing conditions based on the process parameters and structural characteristic parameters input by the operator to avoid chattering of the processing machine.

100‧‧‧Cutter shake avoidance system

200‧‧‧ spindle

210‧‧‧knife

220‧‧‧Tools

300‧‧‧Vibration detection device

400‧‧‧Control device

500‧‧‧Shake avoidance module

510‧‧‧Structural database

511‧‧‧Tool and tool handle parameter coupling analysis unit

530‧‧‧Process Control Module

531‧‧‧ parameter setting unit

533‧‧‧Shake judgment and information processing unit

550‧‧‧ finite element analysis module

600‧‧‧Operation and display module

610‧‧‧ display device

630‧‧‧Operator

For a more complete understanding of the embodiments and the advantages thereof, the following description is made with reference to the accompanying drawings, wherein: FIG. 1 is a schematic diagram of a device for cutting a chattering avoidance system according to an embodiment of the present invention; FIG. 2 is a Stable Lobe Diagram (SLD) according to an embodiment of the present invention; FIG. 3 is a schematic diagram of a modulation suggestion according to an embodiment of the present invention; And [Fig. 4] is a diagram showing an instantaneous vibration curve according to an embodiment of the present invention.

Please refer to FIG. 1 , which is a schematic diagram of a device for cutting a chattering avoidance system according to an embodiment of the present invention. The cutting and shaking avoidance system 100 of the present embodiment can be mainly installed on a general processing machine, and can be used Eliminate the chattering vibration generated by the processing machine. In some examples, the processing machine has a spindle 200 with a tool holder 210 disposed thereon and a knife 220 disposed thereon. The cutting chatter avoidance system 100 mainly includes a vibration detecting device 300, a control device 400, a dither avoidance module 500, and an operation and display module 600. The vibration avoidance module 500 is electrically connected to the vibration detecting device 300, the control device 400, and the operation and display module 600.

Referring to FIG. 1 , the vibration detecting device 300 is mounted on the spindle 200 and is mainly configured to detect the vibration of the tool 220 and generate a vibration signal. In an embodiment, the vibration detecting device 300 can include a vibrating meter (or an accelerometer) and a signal capture card. When the vibrometer senses that the tool 220 vibrates, the vibrometer transmits the sensed tool 220 vibration to the signal capture card, and the signal capture card converts the vibration of the tool 220 into a vibration signal. The control device 400 is electrically coupled to the spindle 200 and configured to generate a control signal to operate the spindle 200 and provide immediate cutting information. For example, the control device 400 can be a computer numerical control (CNC) device.

Referring to FIG. 1 , the dither avoidance module 500 mainly includes a structure database 510 and a process control module 530 . The structure database 510 is mainly used to store a plurality of tool property data and a plurality of tool bar characteristic data. In the present embodiment, the tool characteristic data includes the rigidity, material, outer diameter, and/or number of edges of the different types of tools themselves. In one embodiment, the dither avoidance module 500 can further include a finite element analysis module 550, and the tool property data can be established by the finite element analysis module 550. For the manufacturer (machine manufacturer), the manufacturer can pre-set the tool used by the client (user end) to establish the tool characteristics through the finite element analysis module 550. The material is stored in the structural database 510. In other embodiments, the client may also establish tool characteristic data of different tools to be used by the finite element analysis module 550 according to the usage requirements thereof, and store the data in the structural database 510.

On the other hand, the tool holder characteristic data includes the rigidity of the different types of tool holders, the material and/or the dynamic rigidity of the tool holders on the main shaft. In an embodiment, the manufacturer can establish the dynamic rigidity of different types of tool holders on the main shaft through a dynamic test method such as a tap test, and store the tool characteristic data used by the client in the structure database 510 in advance. in. In other embodiments, the client may also store the extended data provided by the manufacturer in the structure database 510 by means of a hard disk drive or a network transmission.

As shown in FIG. 1 , the process control module 530 mainly includes a parameter setting unit 531 and a dither determination and information processing unit 533 . The parameter setting unit 531 is electrically connected to the dither determination and information processing unit 533, and is connected to the operation and display module 600. The parameter setting unit 531 is configured to set process parameters according to an operation signal, such as a spindle rotation speed, a cutting depth, a machining material coefficient, and a feed rate, and the like. The operation and display module 600 of the present embodiment includes a display device 610 and an operation device 630. It should be noted that the operation signal referred to in this embodiment is generated by the operator inputting the processing parameters through the operation device 630 or selecting a process or a processing condition. In addition, the structural database 510 further includes a tool and toolholder parameter coupling analysis unit 511. The tool and tool parameter coupling analysis unit 511 can select the tool blade characteristic data of the tool holder used and the tool property data of the tool used from the structure database 510 to generate structural characteristic parameters.

In addition, the parameter setting unit 531 is electrically connected to the dither determination and information processing unit 533, and the dither determination and information processing unit 533 is coupled to the vibration detecting device 300, the control device 400, and the tool and tool parameter coupling analysis unit 511, respectively. connection. After the setting of the process parameters and the structural characteristic parameters are completed, the control device 400 can generate a control signal according to the process parameters set by the operator to operate the spindle 200. In one example, the control signal can include spindle speed, depth of cut, and cutting feed rate. When the processing machine is shaken, the dither determination and information processing unit 533 can output the structural characteristics according to the vibration signal, the control signal of the control device 400, the parameter setting unit 531, and the tool and tool parameter coupling analysis unit 511. Parameters to generate trembling information.

In this embodiment, the dither determination and information processing unit 533 is electrically connected to the display module 600. Therefore, after the dither determination and information processing unit 533 generates the dither information, the display device 610 of the operation and display module 600 is operated. The trembling information can be further displayed for the operator's reference.

Referring to FIG. 1 , the tool and tool parameter coupling analysis unit 511 is electrically connected to the chattering determination and information processing unit 533 . After the operator selects the tool set characteristic data of the used tool and the tool characteristic data of the used tool, the tool and tool parameter coupling analysis unit 511 can generate the structural characteristics according to the selected tool characteristic data and the tool tip characteristic data. parameter. Therefore, when the processing machine is shaken, the jitter determination and information processing unit 533 is based on the vibration signal, the control signal of the control device 400, the parameter setting unit 531 data, and the structural characteristics of the tool and tool parameter coupling analysis unit 511. Parameters to determine and generate trembling information, and further Improve the accuracy of the trembling information.

In one embodiment, the trembling information includes trembling steady state information and modulation suggestion information. Referring to FIG. 2 and FIG. 3, a dither steady state diagram (SLD) and a modulation suggestion diagram of an embodiment of the present invention are respectively illustrated. In some examples, the trembling steady state information and the modulation suggestion information may be represented by the chatter steady state map as shown in FIG. 2 and the modulation suggestion map shown in FIG. 3, respectively, but not limited thereto. . In other embodiments, the modulation suggestion information may also be represented in the form of a table. Thereby, the operator can refer to the chatter information displayed by the display device 610 to set a preferred process parameter, thereby causing the control device 400 to operate the spindle 200, thereby achieving the purpose of avoiding chattering. In some examples, the modulation suggestion information may include a spindle speed recommendation value and a cutting depth recommendation value. Therefore, the operator can change the spindle rotation speed and the cutting depth of the processing machine according to the information of the modulation suggestion, thereby achieving the effect of avoiding the chatter vibration of the processing machine.

In addition to the fact that the operator can manually adjust the preferred process parameters to eliminate chattering by the operator's reference to the chatter information, the processor can also automatically adjust the preferred process parameters through the dither avoidance module 500. In some embodiments, after the dither information is generated, the dither determination and information processing unit 533 may further convert the dither information into a modulation signal and transmit the modulation signal to the control device 400. Moreover, after the control device 400 receives the modulation signal, the control device 400 can further manipulate the spindle 200 according to the modulation signal, and the purpose of eliminating the chattering can also be achieved.

In summary, the operation flow of the cutting chatter avoidance system of the present invention is as follows. First, the operator selects and sets the structural characteristic parameters of the tool holder 210 and the tool 220 used by the operating device 630, and the spindle plus Process parameters of the work. After the operator sets the structural characteristic parameters and the process parameters, the control device 400 can generate a control signal according to the process parameters set by the operator to operate the spindle 200 to perform the machining process. When the processing machine is shaken, the vibration detecting device 300 generates a vibration signal. The dither determination and information processing unit 533 can generate the trembling information according to the vibration signal, the control signal of the control device 400, and the structural characteristic parameter set by the operator, and convert the trembling information into a modulation signal for transmission to the control. The device 400 is further adapted to the spindle 200 for the purpose of avoiding chattering.

To be clear, the present invention can provide vibration information in addition to the vibration of the tool, and can also estimate whether the machine is vibrating in an offline state. That is to say, the dither determination and information processing unit 533 can also calculate the optimal processing conditions according to the structural characteristic parameters and the process parameters set by the operator, to assist the programming of the control device 400, thereby improving the control of the overall processing machine. Accuracy and reduce the chance of chattering.

In addition, in other embodiments, the vibration detecting device 300 can also be directly electrically connected to the operation and display module 600. Please refer to FIG. 1 and FIG. 4 simultaneously, wherein FIG. 4 is a diagram showing an instantaneous vibration curve according to an embodiment of the present invention. When the chattering occurs, the vibration detecting device 300 can further convert the vibration signal into an instantaneous vibration graph as shown in FIG. Thereby, the operator can select and display the instantaneous vibration curve through the operation and display module 600 to instantly understand the vibration condition of the tool 220.

It should be noted that the chatter steady state diagram, the modulation suggestion map, and the instant vibration graph shown in FIG. 2 to FIG. 4 are for illustrative purposes only, and the numerical values and curve distributions in the drawings are not intended to limit the present invention. Different dither conditions and parameters The settings affect the values and curve distribution in the graph.

According to the embodiment of the present invention, the cutting chatter avoidance system of the present invention can mainly generate the vibration information according to the vibration signal generated by the tool during processing, the instantaneous process parameters during processing, and the structural characteristic parameters set by the operator. In order to provide the processing machine to automatically adjust its process parameters, in order to achieve the effect of avoiding chatter. In other use cases, the operator can also directly adjust the process parameters of the processing machine by directly referring to the trembling information.

In addition, the structural database of the present invention mainly stores a plurality of different types of tool holders and tool characteristic data, and provides an operator to select and set the tool and the tool holder used by the processing machine. Therefore, when the chattering occurs, the dither determination and information processing unit can generate corresponding trembling information according to the different structural parameters of the tool holder and the tool, and the relevant process conditions at the time of the occurrence of the chatter, thereby enhancing the flutter. The accuracy of the earthquake information. Under other conditions of use, the chattering judgment and information processing unit can also calculate the optimal processing conditions based on the process parameters and structural characteristic parameters input by the operator to avoid chattering of the processing machine.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧Cutter shake avoidance system

200‧‧‧ spindle

210‧‧‧knife

220‧‧‧Tools

300‧‧‧Vibration detection device

400‧‧‧Control device

500‧‧‧Shake avoidance module

510‧‧‧Structural database

511‧‧‧Tool and tool handle parameter coupling analysis unit

530‧‧‧Process Control Module

531‧‧‧ parameter setting unit

533‧‧‧Shake judgment and information processing unit

550‧‧‧ finite element analysis module

600‧‧‧Operation and display module

610‧‧‧ display device

630‧‧‧Operator

Claims (9)

A cutting flutter avoidance system for eliminating a cutting chatter generated by a processing machine, wherein the processing machine has a spindle, and the spindle is provided with a tool holder and a cutter, wherein the cutting vibration avoidance system comprises: a vibration detecting device is disposed on the spindle and configured to detect vibration of the tool and generate a vibration signal; a control device electrically connected to the spindle and configured to generate a control signal to operate the spindle and provide Instant cutting information; a dithering avoidance module electrically connected to the vibration detecting device and the control device, wherein the dither avoidance module comprises: a structural database storing a plurality of tool characteristic data and a plurality of tool holder characteristics Data, wherein the structural database includes a tool and toolbar parameter coupling analysis unit, and the tool and toolbar parameter coupling analysis unit is configured to select the toolbar characteristic data and the tool property data from the structural database to generate a structural characteristic parameter; and a process control module comprising: a parameter setting unit configured to operate according to an operation signal Setting a process parameter; and a dither determination and information processing unit configured to generate a trembling information according to the process parameter, the structural characteristic parameter, the vibration signal, and the control signal; and an operation and display module, Sexual connection of the dither avoidance module and vibration The motion detecting device, wherein the operation and display module comprises: an operating device configured to select or input parameters; and a display device configured to display the shaking information. The cutting chatter avoidance system of claim 1, wherein the trembling information includes a trembling steady state information and a modulation suggestion information. The cutting chatter avoidance system of claim 2, wherein the modulation suggestion information includes a spindle speed recommendation value and a cutting depth recommendation value. The cutting chatter avoidance system of claim 1, wherein the dither determination and information processing unit further converts the trembling information into a modulated signal and transmits the modulated signal to the control device, where the control device receives After the modulation signal, the control device can control the spindle according to the modulation signal. The cutting chatter avoidance system of claim 1, wherein each of the tool characteristic data includes rigidity, material, outer diameter, and/or number of edges of the tool. The cutting chatter avoidance system of claim 1, wherein the dither avoidance module further comprises a finite element analysis module Group, configured to create and store the tool property data in the structure database. The cutting chatter avoidance system of claim 1, wherein each of the tool set characteristics includes the rigidity of the tool holder, the material, and/or the dynamic rigidity of the tool holder disposed on the spindle. The cutting chatter avoidance system of claim 1, wherein the control signal comprises a spindle rotational speed, a cutting depth, and a cutting feed rate. The cutting chatter avoidance system of claim 1, wherein the vibration detecting device is configured to further convert the vibration signal into an instantaneous vibration curve; and the display device can display the instantaneous vibration curve.