THE DEVELOPMENT OF HIGH PRECISION CERAMIC BALL LAPPING SYSTEM WITH IN-PROCESS MEASURING APPARATUS.

1996 Fiscal Year Final Research Report Summary

• Project/Area Number: 07555045
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 試験
• Research Field: 機械工作・生産工学
• Research Institution: MIYAGI NATIONAL COLLEGE OF TECHNOLOGY
• Principal Investigator: AKAZAWA Makoto MIYAGI NATIONAL COLLEGE OF TECHNOLOGY,DEPARTMENT OF MECHANICAL ENGINEERING,ASSOCIATE PROFESSOR., 機械工学科, 助教授 (60005379)
• Co-Investigator(Kenkyū-buntansha): ADACHI Shigeru JAPAN FINE CERAMICS CO.LTD., PROCESSING DIVISION,MANAGER., 製造部第三課, 課長 ; OOHISA Tadayoshi MIYAGI NATIONAL COLLEGE OF TECHNOLOGY,DEPARTMENT OF MECHANICAL ENGINEERING,ASSOC, 機械工学科, 助教授 (40099768) ; MATUYA Tamotu MIYAGI NATIONAL COLLEGE OF TECHNOLOGY,DEPARTMENT OF MECHANICAL ENGINEERING,PROFE, 機械工学科, 教授 (60042256)
• Project Period (FY): 1995 – 1996
• Keywords: CERAMICS / LAPPING / SPHERE / SPHERICITY / ACCURACY / SURFACE ROUGHNESS / IN-PROCESS MEASUREMENT / FFT

Research Abstract

(1) Development of in-process measurement of diameter of ceramic spheres in the lapping process.
The inclined V-groove was used to guide ceramic spheres to measure the diameter. The diameter of sphere was measured by a electric micrometer. After measurement, the lapping process was evaluated and spheres were classified in several gauge range.
(2) Development of in-process evaluation of sphericity of ceramic spheres in the lapping process.
The vibration of a lap was detected and analyzed to evaluate the sphericity of ceramic spheres during the lapping process.
The vibration of a lap of the high precision lapping stage did not include higher frequency component. But in the initial lapping stage, higher frequency components were observed. The analysis was carried out by using the fft method.
The sound of the lapping process was detected and analyzed to evaluate the sphericity of ceramic spheres during the lapping process. This easy technique was not effective for the much noise.
(3) In-process evaluation of surface roughness of ceramic spheres in the lapping process.
Surface roughness was determined basically by the grain size of abrasive used in the lapping process and other lapping condition, for roughness was consisted of much fine scratches caused by abrasive grains.
Because the depth of fine scratches was much smaller than the grain size, vibration of noise caused by fine scratches could not detected. Therefore, it was difficult to detect surface roughness in the lapping process.