선반 구조변경을 위한 현장용 공구대 강성계산모델

Abstract

In this research, a practical stiffness calculation method is developed and applied for modifying the heightof the headstock, turret, and tailstock of a CNC lathe to enlarge the turntable diameter. The casting structureis assumed to be a rigid body and the linear motion element to be an elastic spring to simplify the turretstiffness calculation model. The stiffness of the sliding guide and ball screw of the original lathe is measuredwith a push tester and LVDT sensor, and the turret stiffness of the modified lathe is predicted and comparedwith experimental results to verify the model. The measured stiffness of the original turret is 0.17 kN/μm andthat of the modified turret is 0.11 kN/μm, i.e., an 18% difference from the predicted result. The verifiedstiffness calculation model can be used to develop another modified lathe.