CHUCKING PERFORMANCE OF A WEDGE-TYPE POWER CHUCK

In order to improve the chucking performance of a wedge-type power chu ck with three top jaws, bending tests, chucking accuracy tests, and cu tting tests in the chuck-work system were performed using top jaws wit h different inner diameters, gripping positions, and taper angles. Ben ding stiffness, eccentricity of a workpiece, and cutting stability of the chuck were assessed using variance analysis. The inner diameter an d the taper angle are effective to increase the bending stiffness; how ever, the gripping position is generally ineffective. With respect to the chucking accuracy, the effects of the inner diameter and the taper angle are significant; however, the effect of the gripping position i s insignificant. Top jaws with tapered gripping parts are effective fo r limiting chatter vibration in actual use. Therefore, for the wedge-t ype power chuck used in the experiment, the use of the top jaws with t apered gripping parts is the most effective.