No abstract

No abstract

A fake reject (FR) with unqualified operational dimension often occurs during part machining when the operational data do not coincide with the design ones. This may lead to unnecessary waste. A novel judgment and remedial measures for FR are investigated in this paper to enhance products' qualification rate. Firstly, the reasons for the FR occurrence are discussed based on the fact that the operational dimension tolerance calculated using the worst-case method of the process dimension chain calculation is too tight. Secondly, a novel judgment method of FR is proposed by calculating a new dimension chain. The operational dimension is treated as the concluding link. The actual deviations of the dimensions generated before the operational dimension generation are used to replace their upper and lower deviations. Finally, based on the error compensation relationship among the component links in the process dimension chain, a novel remedial measure of FR by compressing dimension tolerance in subsequent processing is proposed. The calculation flow of the dimension tolerance after tolerance compression is worked out. This study's results of this study are considered for instrumental in judging and processing FR in part machining.

No abstract