Energy efficiency assessment for machine tool is the basic of its energy efficiency improvement. The existing researches of energy efficiency assessment mainly focus on the machining process of machine tool. However, the study on the nature energy efficiency assessment of machine tool, which is able to support the design for energy-efficient machine tools, is defective. A concept of inherent energy efficiency (IEE) which represents the nature energy efficiency of machine tool based on energy consumption characteristics of machine tool is presented, and the IEE is the integrated energy efficiency of various processes. The connotation of inherent energy efficiency of machine tool is analyzed and an effective way for describing IEE named virtual workpiece method is proposed. An assessing index system, including two comprehensive indices (inherent specific energy consumption and inherent energy efficiency) and four single indices (standby power, equivalent starting energy, equivalent unloaded power and equivalent additional load loss coefficient), is built. Moreover, the obtainment method for the inherent energy efficiency indices mentioned above are built based on the virtual workpiece, aiming to access internal energy efficiency of machine tool. The case study shows the practicability of the method presented. The method plays an important role in designing energy-efficient machine tools, designing and developing new manufacturing system, as well as rebuilding high energy consumption equipment, which would contribute to improving the comprehensive energy efficiency of machine tools during the use phase of lifecycle.
TUO Junbo
,
LIU Fei
,
ZHANG Hua
,
LIU Peiji
,
CAI Wei
. Connotation and Assessment Method for Inherent Energy Efficiency of Machine Tools[J]. Journal of Mechanical Engineering, 2018
, 54(7)
: 167
-175
.
DOI: 10.3901/JME.2018.07.167
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