JPS55147339A - Method of measuring length of crack - Google Patents
Method of measuring length of crackInfo
- Publication number
- JPS55147339A JPS55147339A JP5672279A JP5672279A JPS55147339A JP S55147339 A JPS55147339 A JP S55147339A JP 5672279 A JP5672279 A JP 5672279A JP 5672279 A JP5672279 A JP 5672279A JP S55147339 A JPS55147339 A JP S55147339A
- Authority
- JP
- Japan
- Prior art keywords
- cracks
- shaft
- isothermal line
- length
- rotation
- 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
Landscapes
- Length Measuring Devices With Unspecified Measuring Means (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
PURPOSE: To measure the length of cracks without stopping the rotation of a rotary shaft by obtaining the temperature distribution of the rotary shaft after imparting heat to the rotary shaft where a crack occurs.
CONSTITUTION: When a point in the vicinity of cracks of a shaft during its rotation is heated for a short period of time by means of a high-frequency heating device 4, the heat is transmitted concentrically within the shaft from a starting point of a heat source point 5. If there are no cracks, the isothermal line on the shaft surface is substantially concentric, and if cracks are present, the isothermal line abruptly gets out of the concentric circle shape at this portion. Therefore, by observing the presence or absence of the distortion in the isothermal line on the shaft surface, the length of the cracks can be obtained. Moreover, since a synchronous temperature measuring apparatus 6 performs the observation of the isothermal line in synchronism with the rotation of the shaft, an isothermal line pattern 7 is taken in a picture in a predetermined short period of time after the heating, and the picture is served for the measurement of the length of cracks.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5672279A JPS55147339A (en) | 1979-05-04 | 1979-05-04 | Method of measuring length of crack |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5672279A JPS55147339A (en) | 1979-05-04 | 1979-05-04 | Method of measuring length of crack |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55147339A true JPS55147339A (en) | 1980-11-17 |
Family
ID=13035373
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5672279A Pending JPS55147339A (en) | 1979-05-04 | 1979-05-04 | Method of measuring length of crack |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55147339A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63110145U (en) * | 1987-01-10 | 1988-07-15 | ||
JPH03197856A (en) * | 1989-12-26 | 1991-08-29 | Toshiba Corp | Inspecting device for surface layer defect |
-
1979
- 1979-05-04 JP JP5672279A patent/JPS55147339A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63110145U (en) * | 1987-01-10 | 1988-07-15 | ||
JPH0533417Y2 (en) * | 1987-01-10 | 1993-08-25 | ||
JPH03197856A (en) * | 1989-12-26 | 1991-08-29 | Toshiba Corp | Inspecting device for surface layer defect |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS52137734A (en) | High frequency induction heating device | |
JPS5317509A (en) | Method and apparatus for induction heating of metallic material | |
JPS55147339A (en) | Method of measuring length of crack | |
JPS52103734A (en) | High-frequency heater | |
JPS5315160A (en) | Sensitivity controller of self-scan image sensor in thermal radiating object measuring apparatus | |
JPS51124845A (en) | High-frequency wave heating apparatus | |
JPS5216279A (en) | Measuring method of temperature in high-frequency inductive heating | |
JPS51127742A (en) | Temperature control device | |
JPS53106077A (en) | Temperature measuring method of drawing materials in drawing line | |
SE9002446D0 (en) | PROCEDURE AND DEVICE FOR FLOW SPEED Saturation | |
JPS5383672A (en) | Method and apparatus for detecting inside defect of continuous | |
JPS5554228A (en) | Method and apparatus for improving working characteristic of open end of main body of cylindrical metallic container | |
JPS5299830A (en) | Heat fixing device for copying apparatus | |
JPS5346069A (en) | Method and apparatus for thermal diffusivity measurement | |
JPS53110890A (en) | Method and apparatus for testing thermal fatigue | |
JPS5646451A (en) | Test method for heat insulating performance of vaccum bottle | |
JPS5249086A (en) | Method and apparatus for measuring temperature and sampling of molten steel flow | |
JPS51133070A (en) | Method and apparatus for measurement of coefficient of thermal conduct ivity | |
JPS51136515A (en) | Process and apparatus for hardening roll surfaces | |
JPS5362592A (en) | Ultrasonic probe device | |
JPS5395347A (en) | High frequency heating apparatus | |
JPS53133A (en) | Thermal fixing device | |
JPS5350545A (en) | High-frequency heater | |
JPS62289745A (en) | Method and device for check test of heat resistance | |
JPS5614105A (en) | Measuring method for electrode length of electric furnace for smelting |