Study on precision grinding of screw rotors using CBN wheel |
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Authors: | Jing Wei Qi Zhang ZheZhu Xu and SungKi Lyu |
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Affiliation: | (1) Department of Mechanical and Process Engineering, Hochschule Furtwangen University, Villingen-Schwenningen, Germany |
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Abstract: | With increasing demands for high-speed and high-precision machining technology, CBN shape grinding is an effective means in
the field of precision machining for screw rotors. Aiming at the high precision machining of screw rotors, a mathematical
model for the axial profiles of the CBN wheel for machining screw rotors is developed based on theory of gear engagement.
Small electroplated CBN wheel is firstly used to grinding screw rotors. Taking the backlash of screw rotors and the coating
thickness of CBN layer into consideration, the modification of the base body of the wheel shape is introduced into the design
of CBN wheel. For reducing the tooth profile errors of screw rotors induced by mounting errors and wears of CBN wheel, a mathematical
model of the error analyses is established and the influence curves of the profile errors affected by mounting errors and
radius error of grinding wheel are proposed. The electroplated CBN wheels for the screw rotors are made to verify the validity
and effectiveness of the presented method and the machining experiments were performed. Results of this study reveals that
the method proposed in this paper can be used as the precision grinding of screw rotors. |
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Keywords: | |
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