| Manufacturing industry as an important pillar of the national economy,is leading our country the world's first manufacturing power,at the same time it has caused irreversible damage to the ecological environment.Abuse of cutting fluid has caused the serious environmental pollution,harm to the health of workers,non-ideal lubrication and cooling effect,high cost of recycle processing and a series of negative effects,especially in the field of traditional metal cutting processing.It is not only contrary to the green manufacturing theory,but also to improving business efficiency and competitiveness.As “German industrial 4.0” being put forward,“made in China 2025” suitable for the present situation of China's manufacturing industry arises and “Green manufacture,intelligent manufacture” two core technology has become the main direction of “made in China 2025”.On this background,the low temperature cold wind minimal quantities of lubricant(CW-MQL)green cutting technology is put forward against the drawbacks of using cutting liquid cooling technology for traditional metal cutting processing,and the application of this technology is studied systematically and experimentally in the field of modern mechanical processing.(1)In summary of the current low temperature air cooling device on the basis of the research and application status,a new type of cold air jet machine is designed and manufactured emphatically.The low temperature cold wind trace lubrication intelligent cutting cooling system is innovatively designed,with main characteristics of two-stage steam compression refrigeration cycle,trace lubricants quantitative pulverization,dynamic cutting real-time detection control,nozzle adaptive adjustment,the technological parameters database and etc.At the same time,the new type of cold air jet machine is tested comprehensively on its performance.(2)Proposing the design of nozzle adaptive adjustment intelligent.Take machining center automatic tool changing as an example,a mathematical model of nozzle structure adaptive adjustment process is built,implementing nozzle location adjusted intelligently and accurately,in the case that relative position of cutting point and the nozzle remains the same after the tool change.According to nozzle pulverization theory,nozzle structure is modified and the final model of nozzle is obtained by means of parameters calculation.(3)Using the new type of cold air jet machine,the application of mobile phone highlights on low temperature cold wind trace lubrication cutting technology is experimentally researched.Air cooling temperature,cooling pressure and cold air flow,trace amount of lubricating oil for factors and the cutting tool' service life for experiment indicator of the four factors three levels orthogonal experiment is designed.By analyzing the variances and range of the data,primary and secondary influence order for various factors on the tool life,the optimal level combination and significant role are concluded,which provides the basis for real-time adjustment of cold air parameters.(4)Through mobile phone highlights processing comparative experiment on two different cooling and lubricating mode of the low temperature cold wind and traditional alcohol,operating costs are analyzed for low temperature air cooling cutting trace lubrication technology.By the method of fuzzy comprehensive evaluation,the experimental results are evaluated objectively and comprehensively,and then cooling lubrication process optimization selection decision model is constructed for decisionmaking objectives of the machining efficiency,quality,cost,environmental impact and resource consumption.The advantages of low temperature air cooling cutting trace lubrication technology are verified,and it has important practical significance in the field of mechanical machining. |
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