What is meant by Process capability indices?
Process capability indices are statistical measures that assess the ability of a production process to manufacture products within specified tolerance limits. The most commonly used indices are Cp and Cpk, which describe the relationship between process variation and tolerance limits.
Typical software functions in the area of "Process Capability Indices":
- Data collection: Automatic gathering of measurement data from production processes.
- Statistical calculation: Determination of Cp, Cpk, and other relevant indices.
- Graphical representation: Visualization of process capability through histograms and control charts.
- Trend analysis: Monitoring of process capability over time.
- Threshold monitoring: Automatic notification when index values fall below defined thresholds.
- Report generation: Creation of detailed process capability reports for management.
Examples of "Process Capability Indices":
- Cp (Process Capability Index): Ratio of tolerance range to process variation.
- Cpk (Critical Process Capability Index): Additionally considers the position of the process mean.
- Pp and Ppk: Preliminary process performance indices for short observation periods.
- Cm and Cmk: Machine capability indices for evaluating individual machines.
- Cpm (Taguchi Index): Considers the deviation from the target value.
- Cpkm: Combined index of Cpk and Cpm.