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AssigneeLoh Optikmaschinen AG
InventorsJoachim Diehl, Ronald Lautz, Karl-Heinz Tross
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A device is disclosed for the surface machining of, among other things, plastic spectacle lenses, which has a work spindle, by means of which the spectacle lens can be driven with a controlled angle of rotation about an axis of work rotation, and a tool spindle, by means of which a tool can be driven to rotate about an axis of tool rotation, work and tool spindle being movable relative to one another with their positions controlled in two axes running at right angles. For rotational machining of the surface of the spectacle lens to be machined, the tool can also be swiveled by means of the tool spindle with a controlled angle of rotation about the axis of tool rotation, so that a rotational cutting edge provided on the tool can be brought into a defined rotational machining engagement with the surface of the spectacle lens to be machined as a function of the angle of rotation of the spectacle lens. Also included is a combined milling and rotational machining tool and a combined milling and rotational machining method. As a result, high cutting rates and very good surface qualities can be easily and efficiently achieved in the surface machining.
A method for the surface machining of workpieces composed of non-brittle materials in optical lens manufacturing, such as plastic spectacle lenses, in which the workpiece rotating with a controlled angle of rotation about an axis of work rotation is subjected to a milling operation by a tool, which rotates about an axis of tool rotation enclosing a predetermined angle with the axis of work rotation, the workpiece and the tool being movable relative to one another with their position controlled in at least one of two axes running at right angles, wherein the tool during an infeed grinding operation produces an annular trough-shaped recess at least in the area of the outer edge of the workpiece, before the tool in a shaping operation abrades further material along a helical path over the workpiece;
A tool for the surface machining of workpieces composed of non-brittle material in optical lens manufacturing, such as plastic spectacle lenses, the tool having a body defining an axis of tool rotation, on which body a plurality of milling cutter edges are provided, which as the tool rotates about its axis of tool rotation define a circular orbit in a plane perpendicular to the axis of tool rotation, wherein at least one rotational cutting edge is also provided on the body, which is offset radially inwards by a predefined amount in relation to the circular orbit of the milling cutter edges.
A device for the surface machining of workpieces of non-brittle materials in optical lens manufacturing, such as plastic spectacle lenses, the device having a work spindle, by means of which the workpiece can be driven to rotate with a controlled angle of rotation about an axis of work rotation, and a tool spindle, by means of which a tool can be driven to rotate about an axis of tool rotation, which encloses a predetermined angle with the axis of work rotation, the work spindle and the tool spindle being movable relative to one another with their positions controlled in two axes running at right angles;
Dependencies are inferred from the claim text.