Modeling And Simulation Of Drilling Forces Of Carbon Fiber Reinforced Plastics And Titanium Alloy Stacks

Because of its special mechanical and physical properties, Carbon fiber reinforced plastics materials and titanium alloy materials have been more and more used in aviation manufacturing. In the aircraft assembly, it commonly uses rivets to connect carbon fiber reinforced plastics and titanium alloy stacks. Drilling process as one of the most important processing method in manufacturing, researching drilling process of carbon fiber reinforced plastics and titanium alloy stacks can help to better understand drilling principle and build the drilling force model. It can provide theoretical basis and engineering calculation tools for improving the quality of drilling and assembly efficiency.This thesis builds a drilling force model and simulation of carbon fiber reinforced plastics and titanium alloy stacks used with mathematical analysis and finite element analysis. It primarily analyzes the influence of different processing parameters on the drilling process, and conducting the following several aspects:First of all, analyze the geometry relationship of cutting edge. Dividing the primary cutting edge into finite elements, and simplify the drilling process into the superposition of primary cutting edge oblique cutting and the chisel edge cutting, building a mathematical model of drilling force for stacks by the method of mathematical analysis. Then get a cutting force prediction model for drilling stacks used with above model.Secondly, make the experiments of drilling CFRP and TC4, and comparing the results between experiments and theoretical calculation, which says the drilling model and process model of drilling single layer board are effective.Finally, introduce the key technology of building the finite element simulation, and build a finite element simulation model of drilling carbon fiber reinforced plastics/titanium alloy stacks. Simulate the drilling process of the stacks and analyze the influence of drilling force by different processing parameters. At the same time, analyze the influence of the gap between the two kinds of material separating layer by processing parameters. Build the finite element simulation model of drilling stacks with clamping force and analyze the relationship of the gap between two kinds of material and clamping force.Research shows that: The drilling force increases when the diameter and feed increases. The drilling force decreases when the spindle speed increases. But the influence of drilling force by spindle speed is smaller than others. Drilling force is the primary factor influence the quality of drilling and the gap between the layers of two different materials. The greater the spindle speed and the smaller feed can make inhibition effect on the gap and burr. Applying clamping force also can decrease the gap between two kinds of material.