GD450 说明书(中英文版） - 第93页
- 9 3 - Pix 6-9(production setting interface) 12 点击开始按钮 进入生产状态。印刷完成后，显示检测界面。 Click “ ” ( st a rt) button to start production. The inspection interface will displa y after the printing has been finished.
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图 6-8（2D 检测设置完确定）
11 点击生产设置，打开生产设置界面，把 2D 检测选项选上，并点击确定保存设置。
Click “生产设置”(production setting) button and enter into the interface of production setting. Select “2D
检测” (2D inspection) and Click “确定”(ok) button to save the setting.
图 6-9（生产设置界面）
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Pix 6-9(production setting interface)
12 点击开始按钮 进入生产状态。印刷完成后，显示检测界面。
Click “ ” (start) button to start production. The inspection interface will display
after the printing has been finished.
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图 6-10（检测界面）Pix 6-10(inspection interface)
6.2 SPC 系统简介及使用说明 SPC system introduction and operation
6.2.1 名词解释 Noun explanation
用 PPPK 衡量过程能力，要求 PPK>=1.67 才能进入量产阶段，所以又把 PPK 称为初期能
力指数。PPK 通过 PPU 或 PPL 的 最小值来计算， 计 算公式 PPU=(USL-X-bar)/3s 和
PPL=(X-bar-LSL)/3s
Measure process capability by PPPK. When the PPK>=1.67, it can enter into mass
production stage. So PPK is called initial capability indices. PPk is calculated by the
minimum value of PPU or PPL. Calculation formula: PPU=(USL-X-bar)/3s and
PPL=(X-bar-LSL)/3s.
很多公司由于对过程能力的一知半解，往往只要求计算 CPK 的指数来衡量过程能力是否
足够，事实上进入正常生产后应该通过 Cp\CPK\PPK 三个指数之间的差别来判断过程是否有
问题，如果有问题是管理上还是技术上有问题，Cp>1.33 表明过程变差比较小，此时还要看
CPK,当 Cp 和 CPK 相差很大时表明过程有较大的偏移,需要做居中处理，再比较 CPK 和 PPK，
如果两者相差不大表明受特殊因素的影响小，如果两者相差很大表明受特殊因素影响大。工
序在稳定状态下的实际加工能力，即在操作者、机器设备、原材料、操作方法、测量方法和
环境等标准条件下，工序呈稳定状态时所具有的加工精度,这时我们一般会通过 CP、CPK、PP
以及 PPK 等参数作为一个评断标准.
Many companies often only require calculating CPK to measure whether the process
capability is enough because that they know a little knowledge of process capability.
Actually, after entering into normal production, whether the process has problems should be
judged by the difference between the three indices Cp\CPK\PPK. If it has problems, where
are the problems, the management or technology? When the Cp>1.33, it indicates
process variation is small. At this time it also should see CPK. When there is big difference
between CP and CPK, it indicates the process had large offset. It needs to do center
processing, and then compare CPK with PPK. If they have little difference, it indicates that it
is less affected by special factors. If they have big difference, it indicates it is affected by
special factors a lot. The process of actual processing capacity at steady state is affected i
special factors. Namely the operator, machinery equipment , raw materials, operating
method, measure method and environment and so on .The process shows the processing
precision when the stable state . At this time we usually do a judge standard by parameters
such as CP, CPK, PP, and PPK etc.
Cp：过程能力，仅适用于统计稳定过程，是过程在受控状态下的实际加工能力，不考虑过程
的偏移，是过程固有变差（仅由于普通原因产生的变差）的 6σ范围，式中σ通常用 R-bar/d2
或者 s-bar/c4 来估计。所以过程能力是用过程在受控状态下短期数据计算的。因此又将过程
能力称为“短期过程能力”，实际中常将短期省略。这个指数只是针对双边公差而计算的，对
于单边公差没有意义。计算公式为:CP=(USL-LSL)/ 6σ.