Control method for online quality detection
A control method and quality technology, applied in the direction of adaptive control, electrical program control, general control system, etc., can solve problems such as unreasonable quality control plan standards, inability to effectively analyze massive quality inspection data, etc., and achieve early warning of process abnormalities and intelligent diagnosis, the effect of reasonable quality control plan standards
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[0034] Example 1
[0035] Referring to Figure 1, Figure 2, Figure 3, a control method for online quality inspection, the control method includes the following steps:
[0036] (1) Establish case database and rule database: In the case database, record the abnormal cases, abnormal causes and solutions of each online quality control process, and decompose the characteristic attributes of each case; in the rule database, through expert knowledge and Association rule mining establishes rules for various cases;
[0037] (2) In the process of online product quality inspection, abnormal cases are found;
[0038] (3) Perform abnormal diagnosis:
[0039] (3.1) Decompose the current abnormal case into characteristic attributes and compare with existing cases in the case library:
[0040] The nearest neighbor method is used to calculate the similarity between two cases. The calculation formula is shown in formula (1):
[0041] NN ( A , ...
Example Embodiment
[0164] Example 2
[0165] 1, 2, and 3, using the online quality inspection control method of Embodiment 1 to detect abnormal cases of motor quality.
[0166] Failure process: On October 22, 2004, the motor product inspection workshop detected that the no-load current Io of a Y802-2 motor was normal, and the no-load loss Po was normal, but the short-circuit current Id was too small, and the short-circuit power consumption Pd was too large. Symptoms.
[0167] The cause of the failure: Through analysis and inspection, it was found that the rotor resistance was too large. Checking the motor rotor, it was found that the rotor cast aluminum was defective.
[0168] Take measures: (1) Replace the motor rotor; (2) Strengthen the inspection of rotor casting quality.
[0169] First, analyze the failure process of the above case, and extract the following information:
[0170] Motor model: Y802-2
[0171] No-load current Io: normal
[0172] No-load loss Po: normal
[0173] Short circuit curre...
Example Embodiment
[0185] Example 3:
[0186] Referring to Figure 1, Figure 2, and Figure 3, use the online quality inspection control method of Example 1 to detect cases of abnormal motor quality.
[0187]The failure process: In the machining workshop of the motor spindle, the machine tool model is C6132, and the speed is 1200r / min. A certain type of motor spindle is D203, the material is A3, and the shaft diameter (φ20±0.005). The inspection found that the points of the spindle measurement control chart often showed anomalies, the anomaly is: the point falls outside the control limit, and there is a large deviation between the center line and the specification center.
[0188] Reason analysis: first adjust the tooling to ensure that the center line coincides with the specification center. After adjusting the test, it was found that there were still many outliers. Finally, it was analyzed that the accuracy of the machine tool's spindle in the province did not meet the machining requirements. It can...
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