A Study of Taguchi Method for Robust Parameters Design Problems in Shot Peening Process of Engine Repair

• Main Authors: Hsueh-HsienTeng, 鄧學賢
• Other Authors: Chia-Yen Lee
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/va6ec7

碩士 === 國立成功大學 === 工程管理碩士在職專班 === 105 === Shot peening is a common machining method, by using the tiny balls and a high-speed impact on the workpiece surface of a cold forging process. The main purpose of shot peening is to enhance the fatigue resistance and anti-stress corrosion of the workpiece. Most commonly used in automotive, aerospace industrial parts, in recent years, the application of Shot peening has also extended to the mold and precision parts manufacture. The study case is an Air Force unit which responsible for the military engine repair and overhaul. This study begins with an engine maintenance Value Stream Mapping (VSM). Find out shot peening is the critical process of engine maintenance process. And the impact of quality performance mainly is the surface strength. Use Cause ＆ Effect/Fishbone Diagram to screen out 4 control factors, which are impact time, the distance between nozzle and workpiece, steel ball flow, and gas pressure. This research uses Taguchi Method to realize the robust parameter design. It sets 3 Level for each of the 4 control factors to construct a L_9 (3^4 ) factor orthogonal array table, take it into the experiment and acquire 4 quality factors. Calculate the S/N ratio for each quality factor using Taguchi method’s larger-the-better property. Use ANOVA and Regression Analysis to ensure the importance of the 4 control factors and figure out the optimized parameter design. This provides an effective method and a reference to the application of robust design practice for shot peening repair process.