英語(yǔ)翻譯
The quality control (QC) function has traditionlly been performed using manual inspection methods and statistical procedures.Manual inspection is generally a time-consuming procedure which involves precise,yet monotonous work.If often requires that parts be removed from the vicinity of the protection machines to a separate inspection area.This cause delays and often constitutes a bottleneck in the manufacturing schedule.
Inherent in the use of statistical sampling procedures is acknowledgment of the risk that some defective parts will slip through.【1】Indeed,statistical quality control attempts to guarantee that a certain expected or average fraction defect rate will be generated during the production/inspection process.The nature of traditional statistical QC procedures is that something less than 100% good quality must be tolerated.
The is another aspect of the traditional QC inspection process which detracts from its usefulness.It is often performed after the fact.The measurements are taken and the quality is determined after the part are already made.If the part are defective they must be scrapped or reworked at a cost which is often greater than their original cost to manufacture.