Parametric Design And Application Of Drill Bit For Main Oilway Hole Of Automotive Engine Cylinder Head Based On Shape-synergy

In the process of domestic replacement of tools for automobile engine cylinder head production lines,the main oil-hole deep-hole drill is the only tool that does not meet the requirements of the cutting process and has broken tools during drilling.The deep-hole drilling process is a typical difficult-to-machine technique,and the length-to-diameter ratio of the main oil channel deep hole drilling reach 26.8,and the drilling process is performed in a semi-closed state.Therefore,the main oil channel deep hole drill should be sufficient rigidity,good chip breaking and chip removing performance.through the following research work,this paper proposes an optimization scheme for the deep oil drilling tool of the main oil hole of the cylinder head,which solves the broken tool that occurs on the actual production line.(1)The theoretical model of the deep-hole drilling tool is analyzed and analyzed.The reason for the broken tool is that the deep-hole drilling path is too long and the chip removal resistance is too large.Based on the research of the drill point structure model and the theory of helical groove processing and forming,a flat rear face,a parabolic truncated helical groove,a new type of chisel edge grinding method and a curved edge model were determined.(2)Software development for parametric modeling of deep oil drilling tools for main oil hole based on NX secondary development kit.Utilizing the API function library provided by UFUN secondary development tools and the function of NXOpen recording code,the problem of complex curve and surface creation during the parametric design of the drill was solved,and the precise parametric design of the drill was realized.(3)Take the first clearance,the second clearance,the rake angle of the inner edge and the length of the chisel edge as the analysis factors.Through the design of orthogonal test schemes,the design schemes of deep-hole drill bits for main oil passage holes with 9 different drill point structures were determined.Based on Third Wave Advant Edge simulation software,three-dimensional dynamic cutting simulation is performed on 9 design drill bits to obtain the drilling force and torque curve during the drilling process.Finally,through range analysis,the key parameter combinations that are optimized are the first clearance of the main cutting edge at 5 °,the second clearance of the main cutting edge at 20 °,the rake angle of the inner edge at 5 °,and the length of the chisel edge at 0.2mm.(4)Design a comparative test of the deep hole drilling tool after optimization and before optimization.Simulate the deep hole drilling process of the main oil passage hole of the cylinder head of the OP30 process on a horizontal five-axis machining center.The axial force of the tool after optimization is obviously better than that before optimization.The precision of the deep hole diameter of the optimized tool has been greatly improved,which basically meets the accuracy requirements of deep hole drilling of the main oil hole.The accuracy of parametric modeling of the integrated drill is verified.The validity of 3D drilling simulation based on Third Wave Advant Edge is verified by designing orthogonal test schemes and range analysis methods to optimize the key parameters of the drill tip.Optimized the main oil passage hole drilling tool on the automobile engine production line.