Research On The Influence Of Cooling And Lubricating Conditions On Cutting Performance And The Design Of The Cooling Hole Structure In The Tool

In the field of metal cutting,the excessive use of cutting fluid has caused a lot of resources and energy consumption and environmental pollution.To reduce production costs and reduce the threat to the health of machine tool operators,a cooling lubrication technology emerged,known as Minimum Quantity Lubrication(MQL),replacing the traditional cutting fluid with green cutting media,which is a mixture of high-pressure gas and a small amount of atomized cutting fluid.Compared with traditional casting cutting technology,MQL technology has the advantages of good cooling and lubrication effect,less cutting fluid consumption,and less environmental pollution.To further improve the cooling and lubricating effect,different cooling methods and micro-lubrication technology are combined to create a low-temperature environment to reduce the temperature of the cutting zone,improve the heat transfer efficiency and use the characteristics of the lubricant to reduce friction,and effective cooling and lubrication can be achieved in the cutting zone.For the internal cooling MQL,its cooling and lubrication effect is also closely related to the internal cooling hole structure.At present,in the actual tool production,the design of the internal cooling hole structure of the tool lacks the relevant hydrodynamic theory guidance,so it is necessary to carry out simulation analysis and research to provide support and guidance for the actual design of the internal cooling hole structure of the cutting tool.In this paper,based on the current research status of MQL cutting technology and its synergistic technology at home and abroad,different cooling and lubrication conditions were used to study the effect of cutting performance in the milling of titanium alloy materials,and the cooling and lubricating performance of several synergistic methods was evaluated;based on the principle and characteristics of MQL atomization,an internal cooling MQL system test platform was built,and the influence of atomization parameters and internal cooling hole structure on flow field characteristics were analyzed according to the Computational Fluid Dynamics(CFD)software system,then the atomization parameters and internal cooling hole structure were analyzed and optimized in combination with the experiment;under the conditions of dry cutting,wet cutting,and internal cooling MQL,drilling experiments were carried out on titanium alloys and superalloy materials to verify the cooling and lubricating effect of MQL,and the effect of internal cooling hole structure on cutting performance was analyzed and verified.