Prosessikyvystä

Prosessikyvystä refers to the ability of a manufacturing process to consistently produce output that meets specified requirements. It is a statistical measure that quantifies how well a process is performing relative to its natural variation and the tolerances set for the product. A process with high capability is one that is predictable and produces parts or services that are within acceptable limits most of the time.

The assessment of process capability typically involves analyzing data collected from the process over a period. This data is then compared to the upper and lower specification limits, which define the acceptable range for the product's characteristics. Key metrics used to evaluate process capability include Cp and Cpk. Cp, or Process Potential, measures the potential capability of a process if it were perfectly centered within the specification limits. Cpk, or Process Capability Index, takes into account the actual centering of the process. A Cpk value of 1.33 or higher is generally considered acceptable, indicating that the process is capable of meeting specifications.

Understanding and improving process capability is a fundamental aspect of quality management and continuous improvement initiatives, such as Six Sigma. By identifying and reducing process variation, manufacturers can enhance product quality, reduce scrap and rework, and increase customer satisfaction. This involves investigating the root causes of variation, implementing corrective actions, and monitoring the process to ensure sustained improvement.