Delivery after product inspection is the most basic requirement of quality management. Quality control is to eliminate the factors that lead to unqualified or unsatisfactory results at all stages of the quality cycle by monitoring the quality formation process. In order to meet the quality requirements and obtain economic benefits, various quality operation technologies and activities are adopted. In the enterprise field, quality control activities are mainly the on-site management of production within the enterprise, which has nothing to do with the existence of contracts. Refers to the control technical measures and management measures taken to achieve and maintain quality. Quality inspection belongs to quality control and is an important activity of quality control.
Inventory (data collection form)
Hierarchical (ST reasoning)
Scatter chart ()
pareto chart
Histogram (histogram)
cause-and-effect diagram
Control chart (control chart)
1. Checklist
Make a chart or table with simple data or in an easy-to-understand way. As long as you record the traces of inspection and make statistics for further analysis or inspection, its purpose is to "investigate the status quo".
2. Plato (pareto chart)
According to the collected data, the projects are classified according to bad reasons, bad conditions, types of bad events or customer complaints, and safety accidents. , and find out the items or reasons with the largest ratio, arrange them in order of size, and add the graph of cumulative value. Used to judge the crux of the problem.
3. Characteristic diagram
When the characteristics (results) of a problem are influenced by some main factors (causes), these main factors are sorted out and become interrelated, orderly and systematic graphics. Its main purpose is to clarify the causal relationship, also known as "causal diagram", because its shape is similar to that of fishbone diagram, it is often called "fishbone diagram".
4. scatter diagram.
Corresponding data related to each other take the vertical axis as the result, the horizontal axis as the cause, and then are represented on the grid in the form of points. According to the analyzed table, the relationship between the corresponding data is not judged.
5. Check the chart
A chart used to investigate whether the manufacturing process is in a stable state or to maintain the manufacturing process in a stable state. Control the product quality characteristics of the vertical axis table, with the process change data as the scale; The horizontal axis represents the group number and production date of the product. It is a graph that draws points in time sequence on the graph, and then compares them with the control limit to judge whether the product quality is stable or not.
6. Histogram
Divide the collected data characteristic value or result value into several equal intervals on the horizontal axis of a certain range, and draw the area accumulated by the times of measured values in each interval in the form of columns. So it is also called a column chart.
7. Structured approach
An analytical method that classifies and counts the data collected by departments, personnel, working methods, equipment and places according to the same characteristics.