生産工程における機械部品の管理の実態

抄録

The　application　of　on-line　quality　engineering　methods　in　manufacturing　processesis　very　important since　the　results　directly　contribute　to　the　economic　gain　of　a　company.　However,　few　case　studies have　been　published. This　study　discusses　the　concept　of　on-line　quality　engineering　concept　using　the　results　of collected　samples　which　were　taken　at　certain　intervals,　followed　by　the　measurement　of　the　samples. This　study　was　conducted　with　collaboration　from　several　mechanical　component　parts　manufacturing companies. In　the　study,　the　following　issues　were　discussed: (1)When　a　component　parts　manufactures　estimates　the　functional　limit,　△₀　,　and　the　average　loss,A₀,　in　the　Loss　Function,　the　results　may　not　reffect　the　actual　situation.　lt　is　important　to　well understand　the　concept　of　the　Loss　Function　such　as　the　functional　limit. (2)Sometimes　the　existing　tolerance　is　looser　than　the　one　determined　from　the　functional　limit,　△₀　,and　the　average　loss,　A₀,　resulting　in　a　wrong　tolerance.　For　this　purpose,　the　standards　for　the determination　of　appropriate　tolerances　are　useful. (3)Discussion　of　appropriate　control　systems　for　measurement. (4)How　to　minimize　the　total　loss　due　to　on-line　quality　engineering.