Quantitative impacts of regenerative vibration and abrasive wheel eccentricity on surface grinding dynamic performance

Abstract

In grinding, regenerative-vibration and forced-vibration due to grinding wheel eccentric rotation are main excited-vibration sources that interact with grinding material removal mechanism. In the paper, instantaneous undeformed chip thickness in down-grinding cutting phase may consist of two components, i.e. linear kinetic thickness and nonlinear dynamic thickness. Considering abrasive grit-workpiece interaction in the grinding contact zone, the grinding vibration system is presented by a new set of differential equations of two degrees of freedom (DOF) with a close-loop feedback control system models. Conventional grinding control parameters, including wheel spindle speed, work-speed in feed direction and radial cutting depth, are often regarded as linear constants in many existing simplified models. When considering time delay, they can be transferred to nonlinear variables, so the capability of prediction and the accuracy of solution of the grit-workpiece dynamics performance are improved. Based on quantitative comparison of force and vibration magnitudes, the influence of the eccentric rotation of abrasive wheel and the negative rake angle of working grit cutting edges on grinding performance are demonstrated in the paper.

Comprehensive Influence of Ultrasonic Vibration-Assisted Technology on Material Removal Mechanism under the Excitation of Regenerative Vibration in Precision Grinding Process

“…Precision grinding is widely used to acquire high surface finish, where the material removal is performed by a large number of irregularly-positioned abrasive grits on grinding wheel surface under stable machining conditions [1][2][3]. A stable grinding process is crucial to ensure machining accuracy and to prolong the life of machine tool and grinding tool.…”

Research on Self-Aligning Flanges Based on Piezoelectric Actuators Applied to Precision Grinding Machines

“…The installation eccentricity of the grinding wheel will directly cause changes in the thickness of the surface of the machined component, due to the unevenness of the thickness of the machined surface. Therefore, it will indirectly lead to uneven changes in the force on the grinding machine spindle, and even produce a certain impact that will shorten the working life of the grinding machine spindle [5]. Therefore, the precision mounting of grinding wheels has become one of the key problems that need to be solved in the field of precision grinding at present [6].…”