What are the quality control of production factors?

Quality control method is a method to ensure and improve product quality. The quality control method is to reveal the law of quality difference, find out the reasons that affect the quality difference, eliminate or control the factors that produce defective or unqualified products, and make the products run normally and ideally in the production process. This method was first proposed by shewhart of Bell Telephone Research Institute in the United States in 1924. It has three characteristics: first, it adopts quantitative statistical methods; Second, pay attention to the quality control of the whole production process; Third, a variety of quality data charts are widely used.

Common methods of quality control are:

1. Stratification method: Stratification method, also known as stratification method, is a statistical method that classifies different types of data according to the same properties or conditions, so as to find out their inherent statistical laws;

2. Causality diagram: Causality diagram can be divided into six categories: workers, machinery, methods, materials and environment, and each category has different sub-causes;

3. Scatter chart: Scatter chart, also called correlation chart, is a graph used to express the relationship between two kinds of quality data in quality control;

4. Histogram: it is an analysis method to group the collected quality data and draw a histogram of frequency distribution to describe the quality distribution state;

5. Control chart: The main purpose of the control chart is to analyze and judge whether the production process is stable, find abnormal situations in production in time, prevent unqualified products, and check whether the accuracy of production equipment and process equipment meets the production requirements; Evaluate product quality.