TAILIEUCHUNG - Statistical Process Control 5 Episode 11

Tham khảo tài liệu 'statistical process control 5 episode 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Designing the SPC system 337 For measurements to be used for quality improvement they must be accepted by the people involved with the process being measured. The simple self-measurement and plotting or the how-am-I-doing chart will gain far more ground in this respect than a policing type of observation and reporting system which is imposed on the process and those who operate it. Similarly results should not be used to illustrate how bad one operator or group is unless their performance is entirely under their own control. The emphasis in measuring and displaying data must always be on the assistance that can be given to correct a problem or remove obstacles preventing the process from meeting its requirements first time every time. Out-of-control OoC procedures The rules for interpretation of control charts should be agreed and defined as part of the SPC system design. These largely concern the procedures to be followed when an out-of-control OoC situation develops. It is important that each process operator responds in the same way to an OoC indication and it is necessary to get their inputs and those of the supervisory management at the design stage. Clearly it may not always be possible to define which corrective actions should be taken but the intermediate stage of identifying what happened should follow a systematic approach. Recording of information including any significant events the possible courses of OoC analysis of causes and any action taken is a vital part of any SPC system design. In some processes the actions needed to remove or prevent causes of OoC are outside the capability or authority of the process operators . In these cases there must be a mechanism for progressing the preventive actions to be carried out by supervisory management and their integration into routine procedures. When improvement actions have been taken on the process measurements should be used to confirm the desired improvements and checks made to identify any side-effects

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