Cpk is calculated using the following formula: Cpk = min[(USL – μ) / (3σ), (μ – LSL) / (3σ)] Where: USL: Upper Specification Limit, which represents the maximum acceptable value for a characteristic of interest. LSL: Lower Specification Limit, which represents the minimum acceptable value for a characteristic of interest.

Cpk（Process Capability Index，制程能力指标）是统计制程管制 (SPC，Statistical Process Control)里一个非常重要的专有名词，了解了Cpk就等于了解一大半的SPC观念。 相信你也经常听人家说Cpk最好要管控在1.33以上，但你有没有想过为什么是Cpk>1.33而不是其他的数字呢？ 想了解Cpk=1.33这个管控数字是怎么来的之前，我们得先了解一下何谓Cpk？ 这Cpk又是怎么算出来的呢？ 第二种Cpk的计算公式分别使用规格上下限来计算取最小值就是Cpk： 也就是算出Cpu, …

Process capability indices measure how much "natural variation" a process experiences relative to its specification limits, and allows different processes to be compared to how well an organization controls them. Somewhat counterintuitively, higher index values indicate better performance, with zero indicating high deviation.

Cpk is a measure to show how many standard deviations the specification limits are from the center of the process. On some processes, you can do this visually. Others require an equation. To find Cpk you need to calculate a Z score for the upper specification limit (called Z USL) and a Z score for the lower specification limit (called Z LSL).

09. Cp、Cpk 与 Pp、Ppk 的区别. Cp、Cpk：预测制造过程在最佳条件下的能力。 Pp、Ppk：评估过程在某段时间内的实际性能。 如果过程稳定，则 Ppk = Cpk。 10. 过程能力与 统计过程控制 的区别. 过程能力分析：对过程进行测量和分析，但不会实时调整。

Process capability index (Cpk) is a statistical tool, to measure the ability of a process to produce output within customer’s specification limits. In simple words, it measures producer’s capability to produce a product within customer’s tolerance range. …

2024年11月26日 · Cpk（过程能力指数）是衡量生产过程能够在规定的规格限内生产产品的能力的一个指标。 它考虑了过程的平均值和变异性。 Cpk的计算公式如下：

Cpk is calculated by taking the minimum difference between the process mean and the specification limit (upper or lower specification, whichever is nearest to the process mean) and dividing it by three times the process standard deviation. The formula for Cpk (process capability index) is: Cpk = min(USL − μ 3σ, μ − LSL 3σ)

A: CPK is calculated using the formula: CPK = min[(USL – μ) / (3σ), (μ – LSL) / (3σ)], where μ is the process mean, and σ is the standard deviation of the process. This calculation considers the worst-case scenario of the process’s ability to meet the specification limits, accounting for any shift in the process mean.

2024年12月30日 · Cp and Cpk help to estimate how well a process characteristic meets specification requirements. This article presents the idea of process capability, useful formulas, result interpretation, and recommendations for proper use.