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New Systematic and Time-Saving Procedure to Design Cup Grinding Wheels for the Application of Ultrasonic Assisted Grinding
C. Brecher(a)(b), R. Schug(b), A. Weber(b), C. Wenzel(b)
a: Werkzeugmaschinenlabor (WZL), RWTH Aachen University, Germany
b: Fraunhofer-Institute for Production Technology, Aachen, Germany
Since glass and ceramic materials have beneficial properties they gain more importance in all technical applications during the last thirty years. For example nowadays ceramics are used as artificial hip joints or as seals for highest relative speeds. Glass components are used for multitude of optical applications like cameras and reflectors. But besides a lot of advantages the processing of these materials is very difficult. Particular, this contains the manufacturing of small components like micro-reactor plates or glass wafers with hundreds of small holes, too.
Using ultrasonic assisted grinding the treatment can significantly be optimised and higher removal rates can be realised. For the generation of ultrasonic waves often piezo actors are used that excite the grinding tools with vibrations of 20 kHz and amplitudes of a few microns. Using an ultrasonic wave the tool geometry is strongly restricted to guarantee the hybrid functionality. The paper describes a new way to calculate the design of tools suitable for their use in ultrasonic assisted grinding. As a machining process the manufacturing of spherical optics with cup grinding wheels is selected.
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