The operational techniques and activities adopted to meet quality requirements are called quality control. That is to say, quality control aims to eliminate factors that cause unqualified or unsatisfactory results at all stages of the quality cycle by monitoring the quality formation process. In order to meet the quality requirements, obtain economic benefits, and adopt a variety of quality operation technology and activities.
Quality control is the activity of technical measures and management measures taken to make the product or service meet the quality requirements. The goal of quality control is to ensure that the quality of products or services meets the requirements (including express, customary, implied or obligatory requirements).
Quality control can be roughly divided into seven steps:
(1) Select the control object;
(2) Select the quality characteristic value to be monitored;
(3) Determine specifications and standards, and specify quality characteristics;
(4) Select a monitoring instrument that can accurately measure the characteristic value or the corresponding process parameters, or make your own testing means;
(5) Conduct practical tests and record data;
(6) Analyze the reasons for the differences between the actual and the specifications;
(7) Take appropriate corrective measures. After appropriate corrective actions have been taken, the process is still monitored to maintain the process at the new control level. In the event of a new impact factor, measurement data analysis is required to correct the cause, so these 7 steps form a closed process called the "feedback loop". This has something in common with DMAIC of 6Sigma Quality Breakthrough mode.
Of the above seven steps, two are the most important:
(1) Design of quality control system;
(2) Selection of quality control technology.
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