| URN | etd-0719116-125242 | Statistics | This thesis had been viewed 381 times. Download 10 times. |
| Author | Deng-Chuan Tsai | ||
| Author's Email Address | No Public. | ||
| Department | Department of mechanical engineering | ||
| Year | 2015 | Semester | 2 |
| Degree | Master | Type of Document | Master's Thesis |
| Language | zh-TW.Big5 Chinese | Page Count | 71 |
| Title | Study on Polishing of SKD11 Die Steel by different abrasive | ||
| Keyword | |||
| Abstract | This dissertation is about the investigation of surface defect and surface roughness of SKD11 die steel after machining based on high precision planar machinery polishing parameters. During experimental process, grinding and polishing of SKD11 die steel surface have been carried out by using slurries of different concentrations with different grinder rotational speeds and counterweight pressure parameter settings in order to explore the original surface of specimen and the surface roughness and morphology after grinding and polishing. In this experiment the SKD11 die steel specimen is placed in between grinding discs to be grinded, and the silicon carbon slurry with particle diameters of 1, 2£gm and alumina slurry are used for surface polishing. During polishing process, parameters of concentration, particle diameter, load capacity, rotational speed, polishing time, and the existence of swing assisted polishing have been changed to see their impacts on SKD11 die steel surface polishing. Based on the time-based experimental result, with silicon carbide of particle diameter of 2£gm, the slurry concentration of 15%, the axial load of 6 kg, the grinding disc rotational speed of 60rpm, and without swing assisted polishing, the original surface roughness of SKD11 die steel can be reduced from 1.44£gm to 0.06£gm in a very short time with an improvement rate of 95.83%. With swing assisted polishing and the aforementioned parameters, the original surface roughness of SKD11 die steel can be reduced from 1.44£gm to 0.04£gm within 5~10 min with an improvement rate of 97.22%. In the end, the 3D surface roughness profiler and SEM can be used to observe the surface of specimen for the visual proof that the surface height difference of work piece has been significantly reduced after effective removal of surface roughness of specimen. This experiment has proven that silicon carbide abrasive used in conjunction with swing assisted polishing will result in better polishing effectiveness that that without swing assisted polishing. |
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| Files | indicate in-campus access immediately and off-campus access at 2 years | ||
| Date of Defense | 2016-07-04 | Date of Submission | 2016-07-20 |