Study On Cutting Force And Thermal Characteristics And Crack Propagation Behavior In Cutting Cylindrical Shell Material

As carbide cutting tool when the cylinder material,high temperature and high pressure and large cutting parameters of the processing environment,prone to bond failure problems.In the process of cutting,in view of the problem that the rake face and the chips are torn and the rake face is damaged,the force and thermal characteristics and the surface topography of the tool rake face after the bond is damaged are studied deeply Cutting tool rake surface damage problem in-depth study of the crack expansion behavior.First of all,based on the existence of the cracked form on the rake face of the tool and the type of crack,the stress field and the displacement field of the tip at three types of crack propagation are analyzed from the mechanical point of view.The stress intensity factor of the crack is deduced.The maximum principal stress criterion of the rake face fracture of the carbide cutting tool was analyzed.The crack was the prerequisite of the bond breakage combined with the stress and cohesion of the cutting material of the cemented carbide cutter.Second,the cutting force and cutting temperature at the time of bond damage were obtained from the test of cutting cylinder material 2.25Cr-1Mo-0.25V;the actual knife-chip adhesion during cutting by high-speed photography;Bonded tool design A series of observational tests were conducted to observe the surface defects of the rake face when the bond damage occurred.After that,the cutting process when the bonding occurred was simulated by using the simulation software to get the force and thermal characteristics,the chip state and the main wear of the rake face when the bond was broken.The data and the test obtained cutting force,cutting temperature compared to summarize the carbide cutting tool section material 2.25Cr-1Mo-0.25 V obtained cutting force,the cutting temperature of the law to get the bond when the stress damage The distribution of the chips was analyzed.The status of the chip and the temperature distribution of the chip were analyzed.The main parts of the chip and the wear of the rake face were analyzed.Finally,the ABAQUS simulation software platform and combined with extended finite element correlation theory,the variation regularity of stress intensity factor with different applied load,crack length and sample width was studied.The dynamics of single crack and multiple cracks were simulated.The extension behavior is compared with the crack propagation path obtained by the simulation and the crack generated by the actual machining process.The process of directly observing the crack propagation in the actual machining process is more intuitively observed.