Simulation Analysis And Experimental Research On Heat Transfer Characteristics Of Dry Hobbing

As an important basic part for most mechanical equipment to transmit motion and power,gears are widely used in various fields of manufacturing.Dry gear hobbing has the advantages of high speed,high precision,environmental protection,automation,etc.,and is the main processing technology for gear formation.However,dry gear hobbing has been plagued by cutting heat due to the lack of cutting oil.After the cutting heat is generated,it flows to the chips,hobs,workpieces and other carriers,and finally dissipates in the air.This process creates the necessary conditions for gear hobbing,but also causes tool wear and workpiece thermal deformation.Therefore,the influence of cutting heat on gear hobbing has become an inevitable problem in the current dry gear hobbing process.This article will conduct simulation analysis and experimental research on the heat transfer characteristics of dry gear hobbing through the finite element method in order to extend the tool life,provide a theoretical basis for improving the quality of workpiece processing,which is of great significance to thermal control and thermal compensation in actual dry hobbing.First of all,the principle of gear hobbing and the geometric characteristics of gear hobbing are described.Based on the theory of multi-edge intermittent cutting,the relationship of cutting heat transfer is discussed.Based on generation,transfer and dissipation,models and equations of cutting heat generation,transfer and dissipation are established to provide a theoretical basis for subsequent simulation analysis.Secondly,the parameterized modeling of the hob single tooth is carried out,the chip load heat is calculated,the Deform-3D single tooth cutting simulation model is established,the relationship between the chip heat load and the feed rate under different chip shapes is discussed,and the chip heat transfer rate is analyzed with the speed and the changing law of time,discuss the main reason why chips are the main carrier of cutting heat.Thirdly,based on single-tooth cutting simulation,the trend of the hob heat transfer rate with speed and time is analyzed,the influence of cutting heat on the hob is discussed,and a large-span tool shifting method is proposed to improve the life of the hob.At the same time,based on the thermal-structural coupling simulation analysis method of ANSYS Workbench,a finite element simulation model of the hob-workpiece group is established to analyze the temperature distribution in the thermal steadystate field,and to explore the hob-workpiece group in the structure field.Thermal deformation,analyze the temperature change trend of the key points of the hob-workpiece group under the thermal transient field.Finally,comprehensively analyze and select the temperature measurement methods of the chip,hob,and hob-workpiece group,conduct a dry hobbing temperature measurement experiment,measure and calculate the temperature change of the chip,hob,and hob-workpiece group,compare and analyze experimental and theoretical data,and demonstrate the validity of finite element analysis and cutting heat transfer model.