Process parameters determination for precision manufacturing

✍ Scribed by Angus Jeang; Chung-Zong Hun

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 136 KB
• Volume: 16
• Category: Article
• ISSN: 0748-8017
• DOI: 10.1002/(sici)1099-1638(200001/02)16:1<33::aid-qre287>3.0.co;2-d

✦ Synopsis

Conventional process planning in manufacturing operations presents fixed process means and process tolerances for all operations and allows actual outputs to be distributed around these fixed values, as long as the final outputs fall within acceptable specifications. Some approaches attempt to maximize the process tolerances of all manufacturing operations for part production. Other approaches intend to minimize the tolerance cost or quality loss based on known functions. Most of them consider process mean and process tolerance as independent decision variables in process planning, with the condition that the resultant working dimensions are equal to the design target values of blueprint dimensions. These approaches assume that there is no process drift or deterioration. However, these conventional approaches are inappropriate for small-volume, high-value and precision processing, particularly of a complex part. Hence this study introduces an alternative approach to the tolerance-balancing problem that does not provide specific objective functions, which determines process means and process tolerances simultaneously and adjusts them sequentially.