7.10 General Method for Machine Fault Identification A simple introduction to the troubleshooting of some faults was given above. But for machine failures, what is more important is to identify it. There are a wide variety of machine failures, and they are often caused by multiple outcomes or multiple causes or multiple results. Therefore, how to accurately grasp the connection between the cause of the machine fault and the result is the main purpose of the machine fault identification.
1. Causality diagram. The causality diagram is to connect all possible relationships between the cause and the result graphically, so that finding failures is straightforward.
(Figure 7.1 Fishbone map)
(1) The fishbone diagram associates each of the above-mentioned failures with the cause of its occurrence in the shape of a fishbone, with the middle trunk being the failure (ie, the result), and the fishbone on both sides being the cause. In the case of overprinting, for example, the fishbone map is shown in Figure 7.1. Other fishbone diagrams can also be drawn here.
(2) The rectangular table draws the above fault and its cause in the form of a rectangular table. One side of the rectangle is the fault (ie, the result), and the other side is the cause. Where there is a connection between them, they are indicated by round black spots or other symbols; where there is no contact, they are left blank or indicated with an asterisk. In the following, for example, overprinting and ghosting are used as examples to draw a rectangular table of the relationships between them and their causes.
Other short-form charts of faults can also be drawn here. The advantage of short-form charts is that the cross-relationship between causes and results can be seen. (To be continued)
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