单元式制造， 成组技术（cellular manufacturing， group technology）
cellular manufacturing =grouping production equipment to machine cells ,each specializing in producing a part family
[GT cell] group technology=similar(in design/production process) parts arranged into part families identified, grouped together, resulting in manufacturing efficiencies.
ex:
--plant using traditional batch production and process type layout requiring
~material handling(within cell)
~high in-process inventory(WIP：goods in process, in-process inventory), a company's partially finished goods waiting for completion and eventual sale/the value of items）
~long manufacturing lead times(setup time)
--parts grouped to part families
2 tasks:
1)identify part families零件族
2)rearrange production machines to cells
[GT cell] group technology=similar(in design/production process) parts arranged into part families identified, grouped together, resulting in manufacturing efficiencies.
ex:
--plant using traditional batch production and process type layout requiring
~material handling(within cell)
~high in-process inventory(WIP：goods in process, in-process inventory), a company's partially finished goods waiting for completion and eventual sale/the value of items）
~long manufacturing lead times(setup time)
--parts grouped to part families
2 tasks:
1)identify part families零件族
2)rearrange production machines to cells
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