Abstract
CNC machining systems are inevitably confronted with frequent changes in energy behaviors because they are widely used to perform various machining tasks. It is a challenge to understand and analyze the flexible energy behaviors in CNC machining systems. A method to model flexible energy behaviors in CNC machining systems based on hierarchical objected-oriented Petri net (HOONet) is proposed. The structure of the HOONet is constructed of a high-level model and detail models. The former is used to model operational states for CNC machining systems, and the latter is used to analyze the component models for operational states. The machining parameters having great impacts on energy behaviors in CNC machining systems are declared with the data dictionary in HOONet models. A case study based on a CNC lathe is presented to demonstrate the proposed modeling method. The results show that it is effective for modeling flexible energy behaviors and providing a fine-grained description to quantitatively analyze the energy consumption of CNC machining systems.
Highlights
Manufacturing companies are facing strong economic pressure due to complex and diverse economic trends of shorter product life cycles, increased diversity in customer demand, and the globalization of production activities but are seeking to meet emerging industrial criterions including sustainability for environmental benefits [1, 2]
95% of the environmental impact of Computer Numerical Control (CNC) machining systems is attributed to electrical energy consumption during the utilization phase [5]
This paper proposes a method to model the flexible energy behaviors in CNC machining systems based on a hierarchical objected-oriented Petri net (HOONet)
Summary
Manufacturing companies are facing strong economic pressure due to complex and diverse economic trends of shorter product life cycles, increased diversity in customer demand, and the globalization of production activities but are seeking to meet emerging industrial criterions including sustainability for environmental benefits [1, 2]. Peng et al [28] proposed a universal hybrid energy consumption model for CNC machines, which is comprised of operational state transition model at the higher level and detailed theoretical or empirical component energy models at the lower level. These energy models are used to analyze energy use in specific operational states in CNC machining systems. These methodologies require constructing totally new energy models for the changed machining tasks These methodologies are not effective to understand and analyze the flexible energy behaviors in CNC machining systems.
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