Study On Green Manufacturing Operation Model And Its Main Lines In Machine Tool Industry

Green Manufacturing (GM) is a kind of modern manufacturing mode with the fullconsideration of environmental impact and resource consumption, its goal is to makethe environmental negative impact lower, resource utilization rate higher in the wholelife cycle of product, and make the enterprise economic benefit and social benefitoptimization coordinately. As a resource consumption and environmental emissionsserious typical industry, it’s quite imperative for machine tool industry to implementGM in order to realize its sustainable development and also has important guidingsignificance to the long-term development of the machine tool industry.With support from Major National Science&Technology Specific Projects (NO:2009ZX04001-081) and Natural Science Foundation of China (NO:51035001),Machine indutry GM operation mode and its characteristic lines are studied in the paper.Firstly, the paper discusses the opportunity and challenge that China’s machine toolindustry is facing, and then introduces the requirements of the GM operation model ofmachine tools industry. Thereby, an overall framework of machine tool GM operationmodel, which is comprised of objective systems, characteristic lines, and supportingsystems, has been established. The objective system contains enterprise strategy goalsand enterprise process goals.The characteristic lines consist of the main lines of productdesign process, product multi-stage life cycle process, and product logistics process.The supporting system is composed of some subsystems, such as green designsupporting system, clean production supporting system, optimized operation supportingsystem of material and energy resource, management information system,environmental effect assessment system and quality assurance system.Secondly, the three characteristic lines of GM operation model in machine toolsindustry are specified and analyzed.The main line of product design process is centered on the dominant characteristicsand the framework of machine tool product green design, including design process,design contents and technique systems. Meanwhile, some design technologies formachine tool in general layout, transmission system, machine tool bed and automaticchip removal system, spindle and workbench spindle high speed rotating design, tooland workpiece parts installation design technology and safety protection design etc areemphatically introduced. In view of the multi life cycle process line of machine tool products, the paperanalyses the connotation of multi-stage life cycle of machine tools and propose theconcept of multi-stage life cycle engineering of machine tool. Meanwhile, thearchitecture, process models, and characteristics models are introduced. Thenremanufacturing, one of the important parts of multi-stage life cycle engineering, hasbeen significantly introduced with the specification of the definition and characteristics,process model, process technologies and typical patterns of remanufacturing for oldmachine tools.Regarding the logistics process line of machine tool products, the paper discussesthe environmental emissions that typical production processes, such as casting, forging,machining, heat treatment, coating and assembling, produces and the correspondingtreatments are also presented. Then the carbon emission characteristics of machine toolproducts in the logistics process are substantially analyzed and a carbon emissionmodeling and quantitative method is proposed based on Petri Net.Finally, the GM operation model of machine tool industry that has been specifiedabove are applied into Chongqing Machine Tool (Group) Co., Ltd, which providesimportant theoretical and technological supports for the machine tool green design andold machine tools remanufacturing with a good application effect.