1 The connotation of product quality controlProduct quality control refers to the control of the quality of the products produced by effective means to achieve the expected yield rate of the enterprise. The problems of product quality control can generally be decomposed into three aspects, namely, pre-control, in-process control and post-event control. Ex-ante control corresponds to prevention;In-process control corresponds to resolution;It's time to control teammates with improvements. Among them, prevention is particularly important. There are three aspects of product quality control: before, during and after the event, and the control method corresponds to the pre-event control method, the in-process control method and the post-event control method. However, this model has a drawback, that is, it is more scattered and unsystematic, and it does not meet the requirements of overall planning, coordination and cooperation in the production process under the background of the first chain, so enterprises can establish a comprehensive quality management system to solve the problem of product quality control. Production quality problems can be solved by the method of total quality management, and continuously improved through the method of continuous quality improvement, the specific methods are described as follows. 2. Product quality control methodTotal quality management refers to the management method of enterprise production centered on quality and based on full participation, integrating professional technology, management technology and mathematical statistics technology to establish a scientific, rigorous and efficient quality assurance system. (1) The basic principles of total quality management: Total quality management should follow the principle of checks at all levels, the principle of comprehensive management, the principle of prevention first, and the principle of data speaking, as shown in Figure 8-3. Figure 8-3 Basic Principles of Total Quality Management (2) Basic Methods of Total Quality Management The basic methods of total quality management can be summarized as follows: one process, four stages, eight steps, and mathematical statistical methods. Figure 8-4 shows the details. 
Figure 8-4 Basic method framework of total quality management (3) Quality continuous improvementQuality continuous improvement is a method to strengthen quality management and continuously improve the management level. The implementation of continuous quality improvement activities can make the product quality meet the requirements of customers. PDCA cycle method. The most common method of continuous quality improvement is the PDCA cycle method, which goes through four stages. The four phases include: plan, do, check, and act. Emphasizing continuity refers to the beginning of a new round of "PDCA" after the "PDCA" cycle, which is continuous and endless, and has the following three characteristics, as shown in Figure 8-5. 
Figure 8-5 Schematic diagram of PDCA cycle characteristics The four stages of continuous improvement. The PDCA cycle proceeds through four phases and eight steps. The four phases include: p(plan): plan;d(do): execute;c(check): check;A (Act): Action. Figure 8-6 below shows the details. 
Figure 8-6 Introduction to the four stages of the PDCA cycle The eight steps of continuous improvement. The PDCA cycle consists of eight steps, and the specific implementation steps are shown in Table 8-5. Table 8-5 Schematic diagram of the implementation steps of the PDCA cycle
Step 1 of Phase P: Analyze the status quo and find out the existing quality problemsStep 2: Analyze the causes of quality problemsStep 3: Find out the main causes of quality problemsStep 4: Develop a plan of measuresStep 5: Implementation plan: Stage C: Step 6: Measure, verify, analyze, and evaluate the results of the implementation to determine the improvement effect: Phase A: Step 7: Incorporate the improvement measures that prove to be effective into the relevant documents, and train relevant personnel if necessary to maintain the improvement effectStep 8: Transfer the remaining problems or new problems to the next cycle Requirements for continuous improvement. In the process of continuous improvement, enterprise leaders and employees should actively cooperate with the quality improvement work, and there are the following five requirements, as shown in Figure 8-7. 
Figure 8-7 Schematic diagram of continuous improvement work requirements Furbuck **Chain Management Position Workmanual Quality Control System Position