可能因子总结
分析阶段
MPT Confidential
Page 2
Learnins Control vs Process Capability 2. 过程控制和过程能力 3. Process Capability过程能力:
① Specification, Process and Control Limits.规格,过程和控制界限 ② Process Potential vs Process Performance过程潜在的和实际的表现
•
LSL
USL
MPT Confidential
Page 6
Process Capability过程能力
Process Capability studies can过程能力研究可以:
• indicate the consistency of the process output • 显示过程输出的稳定性
MPT Confidential
Page 4
Process Control vs Process Capability 过程控制和过程能力
2. Process Capability过程能力
The “goodness” of a process is measured by process capability 过程的 “好坏”是过程能力测量的 Compares “voice of the process” with “voice of the customer”,
首先判定过程稳定,确定数据分布是正态的, 再计算过程能力和西格码质量水平.
MPT Confidential
Page 5
What is Capability 过程能力是....
• When process is under control, capability is decided by customer demand and process performance(Product or service quality shifting degree). The more the process meets the customer need, the better the capability will be. 过程在受控状态下时,客户要求与过程表现(产品品质或服务的品质变动程 度)的比值, 如果过程表现越能满足客户要求,则过程能力越充分,反之则不 足.
Page 3
Process Control vs Process Capability过程 控制和过程能力
1. Process Control过程控制 Means the process is operating in statistical control, i.e. common causes are the only source of variation. 意味是过程在稳定状态下生产,也就是说, 一般原因(偶然原因)是变异的唯 一原因 Refers to “voice of the process”, i.e. one only needs data from the process to determine if a process is in control. 起源于”过程的声音”,也就是说,唯一来源于过程的数据来判定过程是否受控. Track performance of the process to verify if it forms a stable distribution over time, typically with a control chart with control limits computed from the process data only. 随着时间过去,反馈过程的表现来验证它是否来自于一个稳定的分布,一般 地,利用从过程数据计算控制界限的控制图来完成. Just because a process is in control does not necessarily mean it is a good process. 仅仅因为过程受控并不一定说它是个好过程.
4. 5. 6. 7.
Short-Term vs Long-Term Process Capability 短期和长期过程能力 “Six Sigma” Quality ; “ 6Sigma”水平; Introduction to Z-score Z-值介绍
① Cycle-Time (Exponential Distribution)循环时间(指数分布)
Capability Analysis 过程能力分析
MPT Confidential
Page 1
测量阶段流程图
定义阶段
流程图(Process mapping)
鱼骨图(Fishbone) C&E矩阵初步分析可能因子 FMEA进一步分析可能因子 测量系统定义,MSA Y 的稳定性判定,过程能力分析 二次FMEA
• indicate the degree to which the output meets specifications • 表明输出满足规格的程度 • be used for comparison with another process or competitor • 可以与另一过程或竟争对手相比较
8. Process Capability for Non-Normal Data非正态分布的过程能力
② Reject Rate (Binomial Distribution)不合格(剔除)率(二项式分布)
③ Defect Rate (Poisson Distribution)缺陷率(泊松分布)
MPT Confidential
which is given in terms of specs. or requirements 比较 “过程声音”和 “客户声音”,哪一个是根据规格或需要给出的? Measures how well a stable distribution (process in control) matches up with customer’s specs. 测量一个稳定的分布(过程受控)符合客户规格的程度.