Process Parameter Optimization And Quality Control Of Deep Hole Gun Drilling

Gun drill is an important tool for deep hole machining.It has many characteristics such as long life,high precision and high cutting efficiency.It can obtain high quality machining effect by machining the slender hole with gun drill,and it is widely used in industrial production.However,the traditional experimental method for parameter optimization is time-consuming and costly,inefficient and predictive of drilling is not strong.In this paper,the 45 th steel bar drill drilling process is taken as the research process.The influence of cutting speed and feed rate on deep hole machining is studied by single factor experiment.According to the deep hole machining theory,based on finite element modeling and simulation,the process parameter optimization problem in the process of gun drilling is studied,and the drilling force is experimentally verified.Combined with the experimental analysis,the influence of cutting parameters on the machining accuracy is analyzed.The research results have certain reference significance for improving the efficiency and precision of gun drilling and machining.The main research contents of this paper are as follows:Firstly,the three-dimensional solid model and finite element analysis model of gun drill bit and parts are established by UG8.0 and Deform-3D respectively.Using Deform-3D finite element software to explore the drilling process and chip formation mechanism,reveal the drill process and chip formation process and deformation law of the drill bit,and analyze the variation law of the drilling force,cutting temperature distribution and bit wear.Secondly,by simulating different cutting parameters,the influence curves of axial force,the curve of drilling temperature shadow and the equivalent stress of drill bit are obtained respectively,and the influence law of different cutting parameters on gun drilling processing is analyzed.Thedrilling temperature,axial force and bit equivalent stress are used as the metrics,and the tool life and cutting efficiency are comprehensively considered to optimize the process parameters of the gun drilling process.Then,by drilling the 45 th steel bar experiment,the drilling force is measured and compared with the simulation value to verify the feasibility and rationality of the simulated drilling process.Finally,through the single factor method,combined with the drilling experiment,the influence of cutting parameters on the roundness,roughness and aperture deviation is analyzed.At the same time,the relationship between cutting parameters and chip shape and the wear of the bit are analyzed,and the machining precision of the workpiece is controlled and combined.In actual production,measures to improve the quality of drilling are preliminarily given from three aspects: process,machine tool and tool.The research shows that the optimization of the process parameters based on the drilling simulation can achieve the reasonable matching of the cutting parameters,obtain the cutting parameters of the 45 th steel bar drilling process,and prove that the simulation results replace some of the actual experiments to optimize the process parameters,which has certain feasibility and correctness.It provides a valuable reference for revealing the essence of the gun drilling process,formulating a reasonable drilling process,improving the hole machining accuracy,improving the chip removal environment,optimizing the gun drill design,reducing the wear or damage of the drill bit,and it has certain guiding value for production practice.