Application of Taguchi Method in the Improvement of Material Surface Stability by High-Frequency Heating
| Autor: | Wei-Hua Tu, 杜威樺 |
|---|---|
| Rok vydání: | 2017 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 105 The company selected as the subject of study is engaged in the manufacturing of car motors. A functional structure problem kept surfacing during the development of the technology roadmap. For this, the DMAIC steps of Six Sigma were adopted for the analysis of this problem. The material of the iron-core silicon steel sheet and the combination of subsequent workstations and the machining stations for the motor production were the keys that led to the damage of rotors and compromised quality. Therefore, high frequency heat treatment was used to improve the surface hardness of rotors. For this, the technical staff in charge of the development and production of this part and professional technicians in charge of post-design workstations were brought in for expert discussion. The 33 development lines and technology roadmap of TRIZ, the contradiction matrix containing 39 parameters derived from TRIZ and invention principle were used to identify the key factors for evaluation. Taguchi’s experiment design method was also used since it is capable of verify the results of previous contradiction matrix analysis. High frequency temperature mode was modified through TRIZ and various parameters were designed for improvement of surface hardness. Then, the Taguchi method was applied to identify appropriate parameters using better factor level combinations in such a working environment based on temperature and time. The three factors of Taguchi method were used as input parameters and the data of motor material surface hardness experiment as output parameters to achieve convergence. The hierarchy of the surface system of parts was analyzed to identify optimized conditions before verification for the predicted Cpk value after improvement. The experiment results suggested that Cpk increased from 0.77 to 1.60, indicating significant improvement of process ability. The optimal solution after improvement showed the feasibility to optimize the parameters of high frequency hardening and heating process with the combination of Taguchi method and response surface method in the attempt to reduce occurrence and quality cost. It is hoped to determine the optimized parameter level combination for the continuous reduction of losses to quality cost. Hopefully this approach will continue to improve quality as well as competitiveness. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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