Preliminary process capability Clause Samples

Preliminary process capability. Studies on preliminary process capability must be conducted in order to obtain information at an early stage on new or revised processes relative to customer requirements for a capable process. The studies must be based on as many measurement values as possible, using at least 6 parts for each significant and each critical characteristic. The preliminary process capabilities are to be included in the part submission warrant. The measurement values must be recorded in the order of production. The preliminary process po- tential (Pp) and the preliminary process capability (Ppk) can be calculated, once the manufacturing process proves to be stable (no inexplicable values outside of the action limits or other criteria for non-coincidental behaviour). The indices Pp and Ppk are used to differentiate between the results of the studies on preliminary process capability and those on process-accompanying verification of capability. The latter are re- ferred to with indices Cp and Cpk. The calculation of Pp and Ppk is based on the same formula as for Cp and Cpk. T T = prescribed tolerance range Cp = σ = standard deviation 6 x σ µ = average value of random sample Once the preliminary process capability has been assessed over a long period of time and shows OK-results, long-term data capture can be conducted for process capability (for example on 35 parts from 2 production lots). For new products that are to be manufactured using new tools or instruments and where no other agreement has been made in writing, the following capability factors are specified by Valeo.
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Related to Preliminary process capability

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