Abstract
As everyone knows, assembly quality plays a very important role in final product quality. Since computer numerical control machine tool is a large system with complicated structure and function, and there are complex association relationships among quality characteristics in assembly process, then it is difficult and inaccurate to analyze the whole computer numerical control machine tool quality characteristic association at one time. In this article, meta-action assembly unit is proposed as the basic analysis unit, of which quality characteristic association is studied to guarantee the whole computer numerical control machine tool assembly quality. First, based on “Function-Motion-Action” decomposition structure, the definitions of meta-action and meta-action assembly unit are introduced. Second, manufacturing process association and meta-action assembly unit quality characteristic association are discussed. Third, after understanding the definitions of information entropy and relative entropy, the concrete meta-action assembly unit quality characteristic association analysis steps based on relative entropy are described in detail. And finally, the lifting piston translation assembly unit of automatic pallet changer is taken as an example, the association degree between internal leakage and the influence factors of part quality characteristics and mate-relationships among them are calculated to figure out the most influential factors, showing the correctness and feasibility of this method.
Highlights
It is known that computer numerical control (CNC) machine tool is the most basic equipment of manufacturing industry, especially the key important equipment of national defense industry, and its quality and reliability have already become the important symbols to measure the modernization level of a nation’s industry
meta-action assembly unit (MAU) quality characteristic association analysis based on relative entropy As a basic action unit of CNC machine tool, MAU should be analyzed as a whole dynamic sub-system with more consideration on its quality and reliability from the kinematic point of view
It is difficult to figure out all the association relationships among the quality characteristics of the whole CNC machine tool at one time
Summary
It is known that computer numerical control (CNC) machine tool is the most basic equipment of manufacturing industry, especially the key important equipment of national defense industry, and its quality and reliability have already become the important symbols to measure the modernization level of a nation’s industry. Meta-action is the basic unit composing CNC machine tool working process, and it has quality characteristics closely related to system performance, which are guaranteed by its structure being correctly assembled; MAU needs to be analyzed. Compared with any other assembly unit, MAU is a basic action unit in CNC machine tool assembly process according to ‘‘FMA’’ decomposition structure, which is more suitable for quality and reliability analysis. MAU quality characteristic association analysis based on relative entropy As a basic action unit of CNC machine tool, MAU should be analyzed as a whole dynamic sub-system with more consideration on its quality and reliability from the kinematic point of view. The concrete steps of CNC machine tool MAU quality characteristic association analysis based on relative entropy are described as follows: 1. Smaller H (q0(nÀ1)j, q0ni) is, more coincident q0(nÀ1)j and q0ni are, more affective q0(nÀ1)j is to q0ni, and closer their association relationship is
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