DefinitionofUpsidingdownedges:Upsidingdownedges,asonestampingprocess,ontheplaneorsurfacepartofmaterials,basedonusingmold,aremadetoformstraightwallsorconcaveedgesofsomeanglealongcloseoropencurveedges,themoldingmethodofwhichisknownasUpsidingdownedges.

　　完全自己翻译的，不知道是否和你的意思，请给分吧。