SPC运用之困惑
看了部分仁兄的贴子，不由不想到本公司，我公司是生产磁性材料的厂家，在同行内产量为世界第一，每月生产型号上千种，并且绝大多数产品，本月做过不知什么时候再做，生产工艺主要为：熔炼、热处理、机械加工（含磨加工或线切割或切片等）、表面处理，我感觉控制图很难用，因为产品型号太多，产量也太不稳定，不知有哪位仁兄的公司，也如我们一样多品种、小批量、产量不恒定，控制图如何应用？:(:(:(:(:(
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lawrence600 (威望:0) - BB
赞同来自: jiangcuiping
When you plot data points in the control chart established, make sure they are transfered to Z too.
For example,
You use a machine to make the diameter for a serial products which have variated diameters, say productA diameter=100mm, product B dia=120mm ...
WHen you produce prodct A, collect data and transfer them to Z; when producing product B, collect data and transfer them to Z, and so on...
Use all these Z to calculate LCL/UCL/CL,and establish the control chart.
When you go to product X, okey, just collect the data and do the transfer.and use the transfered Z to plot in the chart to see if the process(your machine in this case) is in control.
Remember, SPC is for process control not for product control
Thx