Measurement of Grinding Temperature Field Using Infra-Red (IR) Imaging System
- 1. Measurement of Temperature Field in Surface Grinding Using Infra-Red (IR) Imaging System PRESENTED BY - SAYAN MALLICK ROLL NO - 16ME61R14 M.TECH (1st YEAR) MANUFACTURING SCIENCE IIT KHARAGPUR
- 2. CONTENTS • INTRODUCTION • OBJECTIVE • Process description • Experimental Method • Results & Discussion • Conclusion • References
- 3. OBJECTIVE • To measure grinding temperature with an effective method of Infra-Red radiation using optical fiber.
- 4. INTRODUCTION • large amount of energy is expended for material removal in grinding. • Heat is generated resulting various faults in machined surface
- 5. CONTINUED • Grinding Burn • A better understanding of thermal damage is likely to be gained by a study of the workpiece temperature field. • The heart of the measurement technique is a Charge-Coupled Device (CCD) based, Infra-Red (IR) imaging system and
- 6. PROCESS DESCRIPTION Pyrometer 3 kinds of optical fiber is used. Quartz fiber, fluoride fiber and chalcogenide fiber.
- 7. Characteristics of optical fiber
- 8. Spectral transmission loss of optical fibers
- 9. • The upper limit of the wavelength of light transmission :- Chalcogenide - 6 μm Fluoride – 4 μm Quartz – 2 μm • The diameter of the chalcogenide fiber is approximately 320 μm, which is about 6
- 10. Calibration • Emissivity of material depends on many factors. • Such as Temperature, Surface finish and wave length of radiation. • Therefore the calibration curve of the three versions of the pyrometer were obtained by
- 12. Pyrometer
- 13. Schematic diagram of Experiment
- 15. RESULTS
- 18. Temperature Distribution in workpiece • The highest temperature is with Si N , whose grinding power is largest, where the surface temperature is estimated to be 800°C. • At 20 μm depth below the surface, the temperature is approximately 400°C 43
- 19. • In the case of SiC and Al203 the temperatures at 40 μm depth are only 100°C. • The temperature gradients are smaller than for Si3N4. • the main reasons for this is that the grinding powers are smaller than in the
- 20. CONCLUSION • The grinding temperature of ceramics is measured by an IRP with an optical fiber, either a fluoride fiber or a chalcogenide fiber. Si3N4, SiC, and Al203 are used as work materials. • For Si3N4 and Al203, the signal trace versus time is observed as a curve with a great many peaks, but for SiC there are no peaks.
- 21. • This phenomenon arises from the optical properties of ceramics. • The grinding temperature is highest in Si3N4, whose grinding power is the largest for these three materials. • • The temperature distribution in the surface layer of ceramics was greatly different from
- 22. REFERECNES • 1 Littmann, W. E, and Wulff, J., 1955, "The Influence of the Grinding • Process on the Structure of Hardened Steel," Trans. ASM, Vol. 47, pp. 692- • 714. • 2 Takazawa, K., 1966, "Effects of Grinding Variables on the Surface Structure • of Hardened Steel," Bull. Japan Soc. of Precision Engineering, Vol. 2, • No. 1, Apr., pp. 14-19. • ,3 Ueda, T., Hosokawa, A., and Yamamoto, A., 1985, "Studies on Temperature • of Abrasive Grains in Grinding-Application of Infrared Radiation Pyrometer," • ASME JOURNAL OF ENGINEERING FOR INDUSTRY, Vol. 107, No. 2, • pp. 127-133. • 4 Ueda, T., Hosokawa, A., and Yamamoto, A., 1986, "Measurement of • Grinding Temperature Using Infrared Radiation Pyrometer with Optical Fiber," • ASME JOURNAL OF ENGINEERING FOR INDUSTRY, Vol. 108, No. 4, pp. 247-251. • 5 Yamagishi, T., 1989, "Chalcogenide Glass Fiber For Infrared Transmission," • New Glass., Vol. 3, No. 4, pp. 10-12. • 6 Siegel, R., and Howell, J. R., 1972, Thermal Radiation Heat Transfer, • McGraw-Hill Kogakushi, Ltd., pp. 42-78. • 7 Touloukian, Y. S., and Ho, C. Y., 1972, "Thermophysical Properties of • Matter," Plenum, 8
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