Working system, method for detecting contact, and acoustic emission contact detection device
First Claim
1. A working system comprising:
- a working device for working a work by causing a tool to come into contact with the work;
an AE sensor provided in the working device; and
an AE signal processing section for processing an AE signal output from the AE sensor, wherein;
the AE signal processor comprises;
an A/D converter for converting the AE signal into a digital signal;
a frequency analysis section for calculating the frequency characteristics of the digital AE signal;
a storage section for storing the frequency characteristics when the tool is not in contact with the work or tool dresser in the working device as non-contact frequency characteristics; and
a difference calculation section for calculating a difference between the frequency characteristics of the converted digital AE signal and the non-contact frequency characteristics.
1 Assignment
0 Petitions
Accused Products
Abstract
The object is to aim at the reduction in the influence of noises in an output of an AE sensor in a working machine. In a working system comprising a working device for working a work W by causing a tool 14 to come into contact work W, an AE sensor 21, and an AE signal processing section 22 for processing an AE signal output from the AE sensor, AE signal processing section 22 comprises an A/D converter 33 for converting an AE signal into a digital signal, a frequency analysis section 34 for calculating the frequency characteristics of a digital AE signal, storage sections 35, 37 for storing the frequency characteristics when the tool is not in contact with the work or tool dresser as non-contact frequency characteristics, and a difference calculation section 35 for calculating a difference between the frequency characteristics of the detected digital AE signal and the non-contact frequency characteristics.
16 Citations
23 Claims
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1. A working system comprising:
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a working device for working a work by causing a tool to come into contact with the work; an AE sensor provided in the working device; and an AE signal processing section for processing an AE signal output from the AE sensor, wherein; the AE signal processor comprises; an A/D converter for converting the AE signal into a digital signal; a frequency analysis section for calculating the frequency characteristics of the digital AE signal; a storage section for storing the frequency characteristics when the tool is not in contact with the work or tool dresser in the working device as non-contact frequency characteristics; and a difference calculation section for calculating a difference between the frequency characteristics of the converted digital AE signal and the non-contact frequency characteristics. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A contact detection method for detecting that a tool has come into contact with a work or tool dresser in a working device for machining the work by causing the tool to come into contact with the work, the method comprising:
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converting an AE signal output from an AE sensor provided in the working device into the digital signal; calculating frequency characteristics of a digital AE signal; storing the frequency characteristics when the tool is not in contact with the work or tool dresser as non-contact frequency characteristics; and calculating a difference between the frequency characteristics of converted digital AE signal and the non-contact frequency characteristics. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. An AE contact detection device to be attached to a working device for working a work by causing a tool to come into contact with the work, the device comprising:
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an AE sensor provided in the working device; and an AE signal processing section for processing an AE signal output from the AE sensor, wherein the AE signal processing section comprise; an A/D converter for converting the AE signal into a digital signal; a frequency analysis section for calculating the frequency characteristics of the digital AE signal; a storage section for storing the frequency characteristics when the tool is not in contact with the work or tool dresser in the working device as non-contact frequency characteristics; and a difference calculation section for calculating a difference between the frequency characteristics of the digital AE signal and the non-contact frequency characteristics. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification