Construction method of quality characteristic symbolic mapping control chart

Abstract

The invention discloses a method for constructing a quality characteristic symbolic mapping control diagram; which includes constructing a quality characteristic value symbolic sequence, constructing a quality characteristic influencing factor symbolic sequence and establishing a mapping relationship, and constructing a quality characteristic symbolic mapping control diagram. The quality characteristic symbolized mapping control chart of the present invention establishes the mapping relationship between the quality characteristic value and its influencing factors, that is, establishes the mapping relationship between the fluctuation law of the quality characteristic data and the influencing factors causing the fluctuation. On the one hand, it can reflect the quality characteristic data. On the other hand, the fault source can be found in advance through the mapping relationship, so that the error caused by human subjective judgment can be used to predict and adjust the influencing factors of quality characteristics, so that the quality characteristics are in an effective steady state and achieve the purpose of prevention and control.

Description

technical field [0001] The invention belongs to the technical field of quality diagnosis and prevention, and in particular relates to a method for constructing a quality characteristic symbolic mapping control chart. Background technique [0002] From a mathematical point of view, the process of quality diagnosis and pre-control is actually to map the vector of symptom space to the fault source space, that is, to realize the mapping F (mapping relationship) from space X (symptom space) to space Y (fault source). The mapping relationship F is unknown, and the essence of quality diagnosis is to synthesize various knowledge and methods to find out this mapping relationship F, and then apply this relationship. When quality problems occur in the future, the root cause of the problem can be quickly found for real-time control; [0003] The traditional control chart can only judge whether the production process is in a steady state through the change of quality characteristic data...

AI Technical Summary

Problems solved by technology

[0003] The traditional control chart can only judge whether the production process is in a steady state through the change of quality characteristic data over time, but it cannot complete the diagnosis and traceability of abnormal fluctuations in the production process; the traditional control chart can only describe the quality characteristic data. Fluctuation law, unable to describe the relationship between fluctuation law and fluctuation source

In the actual application process, the source and cause of abnormal fluctuations can only be judged by the experience knowledge and subjective judgment of engineers and technicians

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