Process construction quality control mainly includes

Process construction quality control mainly includes process quality and product quality.

Process quality control refers to the management method of controlling technological process and preventing waste products. By means of mathematical statistics, the quality of process products is spot-checked and analyzed, and unstable factors are found and eliminated in time. Control chart, histogram, primary and secondary factor chart, correlation chart and other statistical charts are commonly used to reflect quality changes.

Factors related to the quality of process products, such as physical quantities such as the size and smoothness of processed parts, the supply of waste and defective products in a batch of products, the number of defects in a product, etc. , as the control target. The data of these factors obtained after spot-checking products are used as the basis for measurement (physical measurement of processing) control, piece number (waste and defective products) control and counting (defective products) control.

Principle of process construction quality

1. actual measurement: use necessary testing tools and means to check the quality of the extracted process sub-samples.

2. Analysis: Use histogram method, Pareto diagram method or management diagram method to analyze the data obtained from the inspection to understand the laws followed by these data.

3. Judgment: According to the results of data distribution analysis, such as whether the data conforms to the normal distribution curve. Whether it is between the upper and lower control lines. Whether it is within the tolerance (quality standard), whether it is normal or abnormal. Quality variation caused by accidental factors or systematic factors. , judge the quality of the whole process, so as to determine whether the process meets the quality standards.