Research To Finite Element Simulation And Experimental Of Drilling Force On Deep Hole Drill With Parabolic Flute

As the fast development of machinery manufacturing, deep-hole drilling has amore significant position in the field of machining. However, ordinary twist drill hasmany defects in deep-hole drilling. In recent years, there has been parabolic flute drill(i.e. a kind of deep-hole drill) produced by a lot of manufacturers at home and abroad.This kind of drill has well functions of reducing, scraps discharging, rigidity andstability. Drilling force is an important physical phenomenon in the process of drilling.This paper carries on research to the drilling force of parabolic flute drill through theway of finite element simulation and practical experiment respectively.In the way of finite element simulation, the3D solid models of parabolic flutedrill and ordinary twist drill are built with different geometric parameters by using UG.The finite element model of drilling process is built by using ABAQUS (i.e. largescale general software). In the model of finite element, ductile iron is used as thework-piece material. And the constitutive model of Johnson-Cook which considersthe effect of temperature in processing is applied. At the same time, the cuttingdamage is considered as the standard of scraps segregation. Through modeling,different geometric parameters of drilling bits, different cutting parameters anddifferent drilling force parameters are obtained to analyze their effects on the trend ofdrilling force. The drilling axial force and torque of parabolic flute drill are bothsmaller than those of the ordinary twist drill. Therefore, the parabolic flute drill isexamined to be superior to the ordinary twist drill.In the way of practical experiment, self-making drilling dynamometer is applied tothe drilling tests of steel Q235and ductile iron. The drilling axial forces and torques ofdifferent processing conditions are obtained to analyze their effects on the drilling force.The tests show that the parabolic flute drill with point angle125°has the smallest axialforce. The comparison between the results of finite element simulation and practicalexperiment is made in both qualitative and quantitative aspects. The qualitative analysisindicates that the result of the experiment basically coincides with that of simulation.The quantitative analysis states that two results are very close. This leads to theconclusion that finite element simulation has feasibility.