| URN | etd-0723124-154414 | Statistics | This thesis had been viewed 71 times. Download 1 times. |
| Author | Bo-Yuan Zhuang | ||
| Author's Email Address | hero30323@gmail.com | ||
| Department | Institute Of Mechanical Engineering | ||
| Year | 2023 | Semester | 2 |
| Degree | Master | Type of Document | Master's Thesis |
| Language | zh-TW.Big5 Chinese | Page Count | 84 |
| Title | Study on Grinding Magnetized SCM440 Chromium Molybdenum Steel with Al2O3 abrasive | ||
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| Abstract | This paper mainly investigates the changes in surface defects and roughness values of SCM440 chromium-molybdenum steel after processing using a precision single-plane mechanical polishing mechanism with different parameter settings. During the experimental process, Al2O3 alumina powder was used as the abrasive. SCM440 chromium-molybdenum steel was magnetized and demagnetized separately. The parameter design method developed by Dr. Genichi Taguchi was applied to find the optimal parameter settings for grinding and polishing, with parameters such as abrasive type, particle size, concentration, pressure load, disc rotation speed, and grinding time being set. Using the configuration of direct table combined with the Smaller The Better (STB) signal-to-noise ratio (SN ratio) for analysis, the polishing effects on the surface of SCM440 chromium-molybdenum steel under different parameters were observed. Experimental analysis confirmed that using Al2O3 alumina powder with a particle size of 1µm, prepared into a polishing liquid with a concentration of 15%, and applying an axial pressure load of 2kg and a disc rotation speed of 30rpm, it is possible to decrease the original surface roughness of SCM440 chromium molybdenum steel from 0.44µm to 0.01µm within 6 minutes at lower and slower rotational speeds. The material improvement rate is 97.73%. Subsequently, through 3D surface roughness profilometry, it was found that polishing under optimized parameter settings effectively removes surface roughness traces from the specimen in a short time. It was confirmed that SCM440 chromium molybdenum steel, when magnetized, achieves a smoother surface faster compared to demagnetized SCM440 chromium molybdenum steel. |
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| Files | indicate access worldwide | ||
| Date of Defense | 2024-07-16 | Date of Submission | 2024-07-23 |