Polishing machine with rotating head carrying a plurality of polishing sectors having a segmented and resilient structure

摘要

A polishing machine comprises at least a rotating head (1), connected through a flange (2) to the end of a drive shaft, the working face of the rotating head carrying a plurality of grinding sectors (3), held in hingedly brackets (4), connected to the rotating head (1) at uniformly spaced angular positions, each grinding sector (3) being of an aggregate of abrasive particles and of a bonding resin having a cylindrical working face whose geometric axis lies on a plane normal to the axis of rotation of the head (1) and a shank portion shaped to fit into a receiving slot of the holding bracket (4). Each grinding sectors (3) has a laminated structure including a shaped shank (5) of a rigid material and mechanically resistant to fit in the receiving slot, at least a resilient pad, at least partly of elastomer (6, 8) interposed between a face of said shank (5) and an aggregate abrasive body (9, 10) having said cylindrical working face defined by a plurality of end faces of as many protrusions (9) of aggregate, rising from a relatively thin or flexible base layer (10) of said aggregate, incorporating reinforcing fibers.