MODULE FOR ON-LINE VIBRATION DETECTION AND ADJUSTMENT AND MACHINING CENTER USING THE SAME

• US 20110222980A1
• Filed: 08/30/2010
• Published: 09/15/2011
• Est. Priority Date: 03/12/2010
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Kuo, Tzu-Hsin, Huang, Chun-Hung
• Granted Patent: US 8,776,342 B2
• Time in Patent Office: Days
• US Class Current: 409/80
• CPC Class Codes: B23C 2250/16 Damping vibrations balancing B23C2250/04
• CPC Class Codes: B23Q 11/0039 by changing the natural frequency of the system or by continuously changing the frequency of the force which causes the vibration
• CPC Class Codes: B23Q 17/12 for indicating or measuring vibration
• CPC Class Codes: G05B 19/404 characterised by control arrangements for compensation, e.g. for backlash, overshoot, tool offset, tool wear, temperature, machine construction errors, load, inertia G05B19/19, G05B19/41 take precedence
• CPC Class Codes: G05B 19/4065 Monitoring tool breakage, life or condition
• CPC Class Codes: G05B 2219/37434 Measuring vibration of machine or workpiece or tool
• CPC Class Codes: G05B 2219/41117 Cancel vibration during positioning of slide
• CPC Class Codes: G05B 2219/41122 Mechanical vibrations in servo, antihunt also safety, stray pulses, jitter
• CPC Class Codes: G05B 2219/41128 Compensate vibration beam, gantry, feedback of speed of non driven end
• CPC Class Codes: G05B 2219/42077 Position, speed or current, combined with vibration feedback
• CPC Class Codes: G05B 2219/49176 Compensation of vibration of machine base due to slide movement
• CPC Class Codes: Y10T 29/49774 by vibratory or oscillatory movement
• CPC Class Codes: Y10T 408/76 Tool-carrier with vibration-damping means
• CPC Class Codes: Y10T 409/300896 with sensing of numerical information and regulation without mechanical connection between sensing means and regulated means [i.e., numerical control]
• CPC Class Codes: Y10T 409/304312 with means to dampen vibration

Abstract

A module for on-line vibration detection and adjustment and machining center using the same are provided in the present invention, wherein the module is disposed at the machining center having an interface of feedrate override and an interface of spindle override and the inverter. The module comprises at least one vibration sensor for detecting the vibrating status of the machining center, thereby generating corresponding at least one sensing signal and a processor for processing the at least one sensing signal so as to generate a spindle adjusting signal for the interface of spindle override and the inverter and a feedrate adjusting signal for the interface of the federate override. The computer numerical controller receives the spindle adjusting signal and the feedrate adjusting signal from the interface of the spindle override and federate override respectively and accordingly controls the feedrate and spindle rate of the machining center.

Claims

1. A machining center with on-line vibration detection/adjustment ability, comprising:

a machine frame, configured with a computer numerical control (CNC) unit, a carrier module, a spindle module, a feeding module, a spindle override interface, and a feedrate override interface in a manner that the carrier module, the spindle module, the feeding module, the spindle override interface, and the feedrate override interface are all respectively connected to the CNC unit;

at least one vibration sensor, disposed on the machine frame for detecting vibration statuses of the machine frame and thus generating at least one vibration signal accordingly; and

a vibration signal processor, electrically connected respectively to the at least one vibration sensor, the spindle override interface and the feedrate override interface and the inverter, for receiving the at least one vibration signal and a load signal issued from the machine frame during the performing of a machining process, so as to be used in a calculation and thus generate correspondingly a speed adjustment signal to the spindle override interface or to the inverter and a feedrate adjustment signal to the feedrate override interface.

2. The machining center of claim 1, wherein the at least one vibration sensor is a micro-electro-mechanical (MEMS) sensor.

3. The machining center of claim 1, wherein the at least one vibration sensor is an accelerometer.

4. The machining center of claim 1, wherein the at least one vibration sensor is arranged on the spindle module for detection a vibration status of a spindle configured in the spindle module.

5. The machining center of claim 1, wherein the carrier module further comprises:

a platform, coupled to the feeding module; and

a workpiece holding unit, disposed on the platform.

6. The machining center of claim 5, wherein the at least one vibration sensor is disposed on a device selected from the group consisting of:

the platform and the workpiece holding unit.

7. The machining center of claim 1, wherein the at least one vibration signal process further comprises:

a signal receiving interface, connected to the at least one vibration sensor and the spindle module for receiving the at least one vibration signal and the load signal;

a micro processor, electrically connected with the signal receiving interface, for performing a evaluation based upon the received vibration signal and the load signal so as to generate the speed adjustment signal and the feedrate adjustment signal accordingly; and

an output interface, connected respectively to the spindle override interface and the inverter and the feedrate override interface for transmitting the corresponding speed adjustment signal and the feedrate adjustment signal thereto.

8. The machining center of claim 7, wherein the vibration signal process further comprises:

a parameter receiving interface, for electrically connecting with an external computer for enabling the external computer to alter the parameters of the micro processor through the connection with the parameter receiving interface.

9. An on-line vibration detection/adjustment module, adapted for a machining center configured with a spindle override interface and the inverter and a feedrate override interface, comprising:

at least one vibration sensor, for detecting vibration statuses so as to generate at least one vibration signal accordingly; and

a vibration signal processor, for receiving the at least one vibration signal and a load signal issued from the machining center during the performing of a machining process, so as to be used in a calculation and thus generate correspondingly a speed adjustment signal and a feedrate adjustment signal.

10. The module of claim 9, wherein the at least one vibration sensor is a micro-electro-mechanical (MEMS) sensor.

11. The module of claim 9, wherein the at least one vibration sensor is an accelerometer.

12. The module of claim 9, wherein the vibration signal process further comprises:

a parameter receiving interface, for electrically connecting with an external computer while enabling the external computer to alter the parameters of the micro processor through the connection with the parameter receiving interface.

13. The module of claim 9, wherein the vibration signal process further comprises:

a signal receiving interface, connected to the at least one vibration sensor and the spindle module for receiving the at least one vibration signal and the load signal;

a micro processor, electrically connected with the signal receiving interface, for performing a evaluation based upon the received vibration signal and the load signal so as to generate the speed adjustment signal and the feedrate adjustment signal accordingly; and

an output interface, connected to the micro processor for outputting the corresponding speed adjustment signal and the feedrate adjustment signal.