Use of quality control charts according to ISO 7870-2 and SPC manual (VDA/AIAG)
Once the capability of machines and processes has been successfully established, ongoing production must be continuously monitored in order to detect significant changes and, if necessary, intervene in the process to correct them in good time. This kind of process control in quality assurance is usually carried out on a random basis using quality control charts. In this QM training course about quality control charts, you will learn how these charts work and when which control chart is used.
Our training program on quality control charts in detail
Principles of the control chart
- General application of control charts
- Process-related vs. tolerance-related
- Sampling frequency and size
Shewhart control charts
- Determine sampling frequency
- Charts for the process situation
- Individual value
- Sample average
- Sample median
- Charts for process variation
- Standard deviation
- Range
- Apply Shewhart control chart with extended limits
- Stability criteria
- Dealing with outliers
Further information
What is a quality control chart?
A quality control chart is a key tool in statistical process control (SPC) and is used for continuous process monitoring and control. It visualises samples from a process over time, thereby showing the location and variation of this process data. With the help of warning limits and control limits, the control chart allows a distinction to be made between random variations and systematic process variations, which can be detected and corrected at an early stage. Shewhart control charts provide a statistically sound basis for quality assurance and process capability analyses.
What are the contents of ISO 7870-2?
The ISO 7870-2 standard deals with Shewhart control charts and describes their scope of application, necessary preparations and the individual construction steps. It defines the individual types of quality control charts for variable and attribute data, including the average and range chart, the average and standard deviation chart and the chart for medians. The standard also explains how to evaluate these ISO 7870-2 control charts and how they can be used for continuous process monitoring. It also provides the calculation formulas and factors for the control limits.
