Control chart (management diagram) concept

A control chart is a chart with control limits used to analyze and determine whether production is in a steady state. The control chart not only reflects static but also reflects its dynamic product quality. If the top of each rectangle of the figure (the histogram of the gold concentrate grade change) is connected into a rounded line, it becomes a normal distribution curve. Then turn it 90° clockwise, which becomes the basic format of the control chart, see the figure below. The abscissa indicates the sampling time or sample number, and the ordinate indicates the quality characteristic value of the concentrate product. There are three lines on the map. The upper line is called the upper limit of control, the lower line is called the lower limit of control, and the line in the middle is called the center line. In the production process, the quality characteristic value of the concentrate product is changed to a point on the map. If the points all fall within the upper and lower control limits, and the arrangement of these points has no abnormality, it indicates that the production process is normal and in a controlled state; These points go beyond the upper or lower control limits, or the points are not out of bounds, but the defects are arranged, indicating that the production conditions have changed abnormally, in an uncontrolled state, the cause should be immediately identified, and measures should be taken to restore production to normal. .

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