Finite element computing method of dynamic clamping force of high-speed rotating power chuck

Abstract

The theoretical calculation model of dynamic clamping force is too complicated to be conveniently used in the design and operation of chuck. A finite element calculation method was developed to predict dynamic clamping force, and a serial of experiment was performed to validate the method. A stepping load method was used in the finite element model, in which the load process was carried out in two steps. In the first load step, a bolt pretension was loaded on the draw tube to simulate the input force, and in the second load step, the bolt pretension was locked as an analogy to the function of the hydraulic lock. The dynamic clamping force characteristics were studied in terms of workpiece stiffness, operation parameter, lubrication conditions, and material of jaws. The finite element analysis (FEA) method raised in this text can play an important role for design, manufacture and utilization of power chuck.