JPS55163453A - Quality discriminating method of cast metal - Google Patents
Quality discriminating method of cast metalInfo
- Publication number
- JPS55163453A JPS55163453A JP7147679A JP7147679A JPS55163453A JP S55163453 A JPS55163453 A JP S55163453A JP 7147679 A JP7147679 A JP 7147679A JP 7147679 A JP7147679 A JP 7147679A JP S55163453 A JPS55163453 A JP S55163453A
- Authority
- JP
- Japan
- Prior art keywords
- cast metal
- frequency
- structual
- discriminate
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE: To find a crack and a structual defect by a method wherein the frequency spectrum information of the sound produced when an article of cast metal is hit is processed by a microcomputer and compared with the standard frequency.
CONSTITUTION: An article 1 of cast metal is hit by a hitting apparatus 2, and the radiating sound produced is collected by a microphone 3. This signal produced by hitting is amplified by a front amplifier 4, an amplifier 5, removing unnecessary components of frequency of a wave filter 6, then added to an A/D converter 7. Next, sampling of the signal of a time system and making it into a quantum necessary for the Fourier converting process are conducted by the A/D converter. Furthermore, this output signal is processed for the Fourier conversion by a microcomputer so as to discriminate and detect the frequency, and its size is compared with that of the standard frequency to discriminate the quality. By so doing, both of a crack and a structual defect of cast metal can be found simultaneously.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7147679A JPS55163453A (en) | 1979-06-06 | 1979-06-06 | Quality discriminating method of cast metal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7147679A JPS55163453A (en) | 1979-06-06 | 1979-06-06 | Quality discriminating method of cast metal |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55163453A true JPS55163453A (en) | 1980-12-19 |
Family
ID=13461708
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7147679A Pending JPS55163453A (en) | 1979-06-06 | 1979-06-06 | Quality discriminating method of cast metal |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55163453A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57151850A (en) * | 1981-03-16 | 1982-09-20 | Yaskawa Electric Mfg Co Ltd | Diagnosis of coil deterioration and its device |
JPS58147642A (en) * | 1982-02-26 | 1983-09-02 | Hidehiko Yamada | Detection of defect in product |
JPS58169056A (en) * | 1982-03-31 | 1983-10-05 | Rikagaku Kenkyusho | Detection of internal information of solid sample by photo-acoustic method |
JPS60256051A (en) * | 1984-06-01 | 1985-12-17 | Mitsubishi Heavy Ind Ltd | Non-destructive inspection apparatus |
JPS60256052A (en) * | 1984-06-01 | 1985-12-17 | Mitsubishi Heavy Ind Ltd | Non-destructive inspection method |
JPS61193067A (en) * | 1985-02-21 | 1986-08-27 | Nippon Telegr & Teleph Corp <Ntt> | Method and device for evaluating cast iron article |
JPS6410166A (en) * | 1987-07-02 | 1989-01-13 | Ngk Insulators Ltd | Detecting method for defective insulator |
-
1979
- 1979-06-06 JP JP7147679A patent/JPS55163453A/en active Pending
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57151850A (en) * | 1981-03-16 | 1982-09-20 | Yaskawa Electric Mfg Co Ltd | Diagnosis of coil deterioration and its device |
JPS58147642A (en) * | 1982-02-26 | 1983-09-02 | Hidehiko Yamada | Detection of defect in product |
JPS58169056A (en) * | 1982-03-31 | 1983-10-05 | Rikagaku Kenkyusho | Detection of internal information of solid sample by photo-acoustic method |
JPH0410024B2 (en) * | 1982-03-31 | 1992-02-24 | ||
JPS60256051A (en) * | 1984-06-01 | 1985-12-17 | Mitsubishi Heavy Ind Ltd | Non-destructive inspection apparatus |
JPS60256052A (en) * | 1984-06-01 | 1985-12-17 | Mitsubishi Heavy Ind Ltd | Non-destructive inspection method |
JPS61193067A (en) * | 1985-02-21 | 1986-08-27 | Nippon Telegr & Teleph Corp <Ntt> | Method and device for evaluating cast iron article |
JPH0566544B2 (en) * | 1985-02-21 | 1993-09-22 | Nippon Telegraph & Telephone | |
JPS6410166A (en) * | 1987-07-02 | 1989-01-13 | Ngk Insulators Ltd | Detecting method for defective insulator |
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