Fabrication of small aspheric moulds using single point inclined axis grinding |
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| Affiliation: | 1. Centre for Precision Engineering, School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China;2. State Key Laboratory of Ultra-precision Machining Technology, The Hong Kong Polytechnic University, Hong Kong, China;1. State Key Laboratory of Precision Measuring Technology & Instruments, Centre of MicroNano Manufacturing Technology, Tianjin University, Tianjin 300072, China;2. School of Mechanical & Materials Engineering, MNMT-Dublin, University College Dublin, Dublin, Ireland |
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| Abstract: | Single point inclined axis grinding techniques, including the wheel setting, wheel–workpiece interference, error source determination and compensation approaches, were studied to fabricate small aspheric moulds of high profile accuracy. The interference of a cylindrical grinding wheel with the workpiece was analysed and the criteria for selection of wheel geometry for avoiding the interference was proposed. The grinding process was performed with compensation focused on two major error sources, wheel setting error and wheel wear. The grinding results showed that the compensation approach was efficient and the developed grinding process was capable to generate small aspheric concave surfaces on tungsten carbide material with a profile error of smaller than 200 nm in PV value after two to three compensation cycles. |
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| Keywords: | Single point grinding Inclined axis Compensation Profile error Aspheric mould |
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