B - Operations – Transporting – 21 – H
Patent
B - Operations, Transporting
21
H
90/19, 80/28, 51
B21H 5/00 (2006.01) B21H 5/02 (2006.01) B23F 19/00 (2006.01)
Patent
CA 1079527
APPARATUS AND METHOD AND MEANS FOR REMOVING SURFACE DEFECTS FROM A WORKPIECE ABSTRACT OF THE DISCLOSURE Apparatus and a method for use thereof to remove surface defects from a formed workpiece having a rotary axis about which the workpiece is designed to rotate. A plurality of rotary tools, preferably three, of the apparatus are rotatably mounted in spaced relationship to each other to receive the workpiece there- between in engagement therewith during rotation of the tools and the workpiece. Pressure applied to each of the tools independent- ly of each other tool maintains an engaged condition between the tool and the workpiece while allowing outward tool movement upon engagement with a surface defect such that the rotary workpiece axis remains at a fixed location. Extendable and retractable hydraulic cylinders are preferably utilized to apply the pressure between the tools and the workpiece and the engagement therebe- tween is at intermeshed teeth thereof so as to remove surface de- fects from the workpiece teeth. Each cylinder includes a bore and an undersized piston received within the bore. Hydraulic fluid supplied to the cylinders applies pressure between the tools and the workpiece while the fluid leaks past the pistons at a predetermined rate and, upon engagement of a tool with a sur- face defect on the workpiece, an increased rate of leakage flow permits cylinder retraction that allows outward tool movement without movement of the workpiece. A power drive mechanism of the apparatus rotates one of the tools with a synchronizer rotat- ing the other tools prior to meshing engagement of the workpiece with the tools. After a movable carriage of a carrier moves the workpiece into meshing engagement with the tools, the workpiece synchronizes the rotation of the tools with each other. The drive mechanism increases the rate of rotation after the tools are meshed with the workpiece and rotates the tools in opposite direc- tions to apply pressure that removes surface defects from both sides of the workpiece teeth.
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