| 摘要 |
PROBLEM TO BE SOLVED: To provide a recessed spherical face machining device capable of suppressing eccentric wear of a spherical tool and eccentricity of a recessed spherical face when machining a spherical face of a concave lens having a deep spherical segment and supplying and discharging a working fluid smoothly to improve machining quality and machining efficiency. SOLUTION: This recessed spherical face machining device has the spherical tool 2 made of a magnetic substance for machining the recessed spherical face of the lens 1, a horn 3 transmitting ultrasonic wave vibration generated from an ultrasonic wave generator 4 to the spherical tool 2 while holding the spherical tool 2 so as to roll, a pressing cylinder 11 bringing the spherical tool 2 into contact with the lens 1, a working fluid supply device 6 for supplying the working fluid 5 in which abrasive grains are dispersed to a contact position of the spherical tool 2 and the lens 1, a plurality of electromagnets 7 facing outer periphery of the spherical tool 2 in radial arrangement, and an electromagnet controller 8 for making a rotating and displacing magnetic attraction force act for the spherical tool 2 due to switching of magnetic pole by controlling electrical conductivity to the electromagnets 7 to rotate the spherical tool 2 in the direction of arrangement face of the electromagnets 7 at the contact position of the spherical tool 2 with the lens 1. |
