Formalization of the Actuator Mechanism of the Technological Equipment for Processing Lenses with a Thin Center

When processing optical parts, including lenses, a force-locking method is used, which differs from the geometric locking used in mechanical processing in that the tool is spontaneously positioned on the part and performs a complex movement along its working surface, consisting of relative and translational methods. The fundamental design of technological equipment for parallel shaping of the actuator surfaces of lenses under conditions of force closure with continuous direction of the working force along the normal to the processed spherical surfaces of the part and with its constant value in the process of reciprocating rotational movements of the tools, due to the presence in the equipment design of mechanisms for regulating the magnitude of the force pressing the tools to the workpiece by changing the angle of inclination of the working elements of these mechanisms is presented in the paper. The results of determining the rate of removal of the allowance from the working surface of the lens are presented when the tool pressing force is directed vertically and along the radius of curvature of the part. The geometrical relationships of the actuator of the technological equipment have been formalized. Formulas have been obtained for calculating the length of the input link of the actuator, providing the necessary amplitude of the translational movement of its output link, and for determining the linear speed of the tool in its reciprocating-rotational movement along the processed surface of the lens. Experimental studies have been conducted on the process of finishing lenses using the classical scheme, when the pressing force of the tool during its reciprocating-rotational movement along the working surface of the part is directed vertically, and according to the scheme, when this force coincides with the normal to the spherical surface of the part. As a result, an increase in productivity and quality of processing by an average of 15 and 30 %, respectively has been revealed.

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