印刷机通用说明书(中英文版） 450+.pdf - 第114页

- 113 - Pp ：过程性能，是过程长期运行的实际加工能力，过程总变差（由子组内和子组间二种变差所引起的变化，如果过程处于不受控状态，过程总变差将包括特殊原因和普通原因）的 6σ 范围，式中 σ通常用则称x服从均数为μ，标准差为σ2的正态分布。样本的标准差 s来估计。此时不考虑过程是否受控。因此过程性能也称长期过程能力，也叫性能指数。计算公式 Pp=(USL-LSL)/6s Pp: Perfo rmance o f Proces…

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Pp：过程性能，是过程长期运行的实际加工能力，过程总变差（由子组内和子组间二种变差

所引起的变化，如果过程处于不受控状态，过程总变差将包括特殊原因和普通原因）的 6σ

范围，式中 σ通常用则称x服从均数为μ，标准差为σ2的正态分布。样本的标准差 s来估

计。此时不考虑过程是否受控。因此过程性能也称长期过程能力，也叫性能指数。计算公式

Pp=(USL-LSL)/6s

Pp: Performance of Process, It is actual processing capacity of process in long-term

running. It is 6σ range of process total variation (changed by two variation subgroups

within and between subgroups, if the process is in uncontrolled condition, actual processing

capacity includes special reason and common reason), In the formula, σ is usually called

X obey mean μ, the standard deviation is σ2 normal distribution .The sample standard

deviation uses s to estimate. Whether the process is controlled at this time is regardless. So

process performance is also called the long-term process capability, also is known as

performance index .Calculation formula: PP=(USL-LSL)/6s .

PPK：过程性能指数，因为计算不需要过程稳定（因为在计算公式中已经考虑了普通和特殊两

种原因的影响），所以在 PPAP手册中要求在产品进行试生产过程不稳定时（此时过程受两

种原因影响），特殊因素的影响往往比较容易找到。如果 Cp值本身就很小那说明过程受普

通因素的变差影响大，此时若想提升过程能力往往需要更多的投入和更高的决策才能使问题

得到解决。所以即使有时候 CPK值很高( 比如大于 2) ,如果其与 Cp\PPK相差较大的话还是

需要对过程进行改进。

PPK: Performance index of process. The calculation does not need process stability.

Because calculation formula has considered the influence from common reason and

special reason. So PPAP manual had been required during the trial production process is

not stable (this process is affected by two reasons). The special factor is easier to be found.

If the CP value itself is small and then it means that common factor variation has big

influence on the process. At this time it often needs more investment and higher decision to

make the problem solved to improve process capability. So even if sometimes CPU value is

very high (such as above 2) and it has larger difference with CP and PPK ,it still need to

improve the process.

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2、找一块 PCB，按常规做生产程序步骤，做完 PCB MARK 点识别过程。如图 7-2

Find a PCB board. Do production program steps by convention. Finish PCB MARK

point indentified process. See pix 7-2.

图 7-2

Pix 7-2

3、在 HTGD 软件主界面上点击“生产设置”，在弹出的界面上选择相应的选项并确定。如图 7-3