Radius Internal Cylindrical Grinding of Complex Medical Parts and Implants

United Grinding North America, Inc. (Miamisburg, OH) offers three radius internal cylindrical grinding machines in their line of Studer internal cylindrical grinding machines. The S121, S131 and S141 replace Studer’s CT700 and CT900 models and extend part production capabilities by offering more advanced technology, a new dressing concept and larger size machine to handle a broader range of workpieces. With a workhead on a newly arranged simultaneously swiveling B-axis, the S121, S131 and S141 radius grinding machines offer greater thermal stability, mechanical rigidity and interpolation from -60 deg to +90 deg. The machines are also equipped with a dressing spindle or a fixed dresser on the B-axis and a measuring probe on the grinding head.

These machines feature Granitan® machine beds that provide higher damping levels, thermal stability and guidance accuracy. The StuderGuide® guideway and drive system with linear motors provides high wear resistance, a long working life and high dynamics. It also includes X- and Z-axis in a cross-slide arrangement as well as a cross slide, which in the case of the S121 can take one spindle, two spindles in parallel, or two spindles on a hydraulic turret. In the S131 and S141 machines, the cross slide comes with a four-position turret with direct drive. The spindles on the radius grinding machines are arranged at the rear of the turret.

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Each of the three radius internal cylindrical grinding machines is powered by StuderSIM software that enables an operator to machine complex parts – often in a single clamping. StuderSIM derives workpieces from a drawing and completely defines and generates all necessary geometric data for the grinding cycles. Furthermore, operators can easily check and visualize the grinding process through simulation on a PC or on the machine. With swing diameters of 9.84 in and 11.8 in above the table respectively, the S121 and S131 replace the CT700 and CT900 models. The S141, with a swing diameter of 15.75 in, further extends the capabilities of the product line by enabling machining of larger workpieces. These machines enable external diameters up to 6.3 in to be machined with an external grinding wheel 9.8 in diameter. The maximum length of parts including clamping device is 11.8 in for all three radius grinding machines, and the maximum workpiece weight including clamping device is 220 lb.

These new radius grinding machines are well suited for producing several tapers greater than 20 deg to 90 deg in a single clamping on complex workpieces made of extra-hard materials such as industrial ceramic, sapphire and tungsten carbide that is used in medical technology, as well as in the manufacture of human implants for shoulders, knees and hips from ceramic and titanium. The addition of the S121, S131 and S141 radius grinding machines rounds out the platform of Studer internal cylindrical grinding machines.

United Grinding North America, Inc., 510 Earl Boulevard, Miamisburg, OH 45342, 937-859-1975, Fax: 937-859-1115, [email protected], www.grinding.com.