US 9,061,395 B2Granted

Autocalibration

AssigneeSchneider GmbH & Co. KG

InventorsGunter Schneider, Torsten Gerrath

Life of this patent

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Abstract

A method for calibrating a miffing, cutting or grinding tool of a spectacle lens frame machining unit, for which a) in a first machining step, prior to shaping an edge or surface shape RF by the milling, cutting or grinding tool, the lens is measured by an optical measuring device, b) the shaping of an edge or surface shape RF is carried out by the milling, cutting or grinding tool, c) the generated edge or surface shape RF is measured by the optical measuring device, d) a deviation between the surface or edge shape RF so produced and the desired surface or edge shape target values is determined, and e) the tool is calibrated at least by adjusting the control variables. The invention further relates to a device for the initial working of edges, chamfers and/or grooves at the edges of lenses, wherein an optical measuring system for measuring surface or edge shapes RF and/or edges K of the lens prior to and/or after machining the lens is provided.

Claims8

Dependent claims

A method for machining a surface RF of a lens with a milling, cutting or grinding unit with at least one milling, cutting or grinding tool with cutting geometry, with an optical measuring device being provided in the milling, cutting or grinding unit,

comprising the steps of:
a) measuring the lens with the measuring device prior to shaping of an edge or surface shape RF by the milling, cutting or grinding tool in an initial step;
b) machining the surface RF of the lens rotating about an axis of rotation by at least one milling, cutting or grinding tool and a profiled surface shape is generated on the lens by rotating the lens about the axis of rotation and positioning the milling, cutting or grinding tool in a radial or axial direction;
c) in a further machining step, measuring the thus generated surface shape RF on the lens with the surface measuring device;
d) establishing a degree of variation between the thus generated surface or edge shape RF and the desired surface or edge shape values;
e) adjusting a target data of the machine's control system on the basis of each of the i) measuring of the lens prior to the shaping of the edge or the surface shape RF, and ii) establishing the degree of variation for the purpose of taking account of variations of the tool and optimising the edge or surface shapes RF which are to be generated.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/581,894Filed 4 Mar 2011
Priority: DE 10 2010 010 3384 Mar 2010
Published: US 2013/0055540 A17 Mar 2013
Granted: 23 Jun 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

B24B 49/12
Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring…
B24B 9/148
Of optical work, e.g. lenses, prisms: electrically, e.g. numerically, controlled
B24B 17/06
Involving optical auxiliary means, e.g. optical projection form grinding machines: combined with electrical transmission means, e.g. controlled by…
B24B 47/225
Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation: for bevelling optical work, e.g.…