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The RZ 60 from Reishauer has been optimized for machining planetary pinions for the automotive industry. According to the company, the primary machining times for grinding planetary pinions on the RZ 60 have been drastically reduced in comparison with previous applications.
The machine structure, adopted from the larger RZ 260, enables aggressive grinding parameters without negative effects on workpiece quality, the company says. At maximum speed, the grinding and workpiece spindle positions are controlled with the company’s Precision-Drive electronic gearbox. This also enables the use of multiple start grinding wheels for planetary pinions, which typically have a relatively small number of teeth resulting in high workpiece speeds and tooth-meshing frequencies, the company says. The company’s grinding wheels are designed to increase the cutting speed to 100 m/sec. Grinding times can be as short as 7 sec. for some gears, the company says.
The machine incorporates the two-spindle concept to enable grinding of a workpiece on one spindle while the workpiece on the second spindle is changed and synchronized with the threads of the grinding wheel. Each workspindle has its own meshing probe. The probes are fixed on the workspindle turret to enable the synchronization of the grinding wheel and workpiece during the turret rotation. High workpiece spindle speeds ranging to 3,000 rpm spin the grinding oil off the part during the turret rotation when the grinding operation is completed.