Abstract: An automatic positioning and clamping tool for mounting in a CNC Tilting Rotary Table for positioning and clamping a wheel rim for processing by a cutting tool includes a base, an upright post mounted at the base, air leakage detection units mounted on the base for supporting the wheel rim and detecting an air leakage, clamping devices mounted on the base for clamping the border edge of the wheel rim, a lateral chip conveyor, nozzles mounted around the periphery of the lateral chip conveyor, a vertical hydraulic chuck mounted around the upright post for moving a positioning gripper into abutment against the bore wall of the center bore of the wheel rim, and fluid nozzles mounted in the vertical hydraulic chuck for flushing away chips during processing. Thus, the invention is a compact structure with functions of air leakage detection, wheel rim automatic positioning and clamping and chip removal.

Abstract: A method and structure improves the dynamic characteristics of a linear roller guideway for precision machine tool, robot or automation equipment by: adding a nonlinear component to the linear roller guideway to provide better dynamic stiffness and damping effects. The nonlinear component has a nonlinear contact characteristic of hardening so that during mounting or in a quick movement of the slide units of the linear roller guideway, the nonlinear component has a relatively lower stiffness to reduce its friction with the rail surface; on the other hand, when bearing a load or during a cutting work, the nonlinear component has a relatively higher stiffness. The nonlinear component also provides a planar contact, overcoming the drawbacks of low damping of point or line contact of the slide units of the nonlinear roller guideway, and enhancing the cutting precision of the machine tool.