Method for mechanical and/or optical functionalization of a transparent timepiece component

摘要

A method for mechanical and/or optical functionalization of a transparent timepiece component, including: forming a body of methyl polymethacrylate, including a bottom surface and a mechanical and/or optically functionalized intermediate surface; coating the body with a layer made by injecting a second transparent polymerizable material into a cavity between a mold and the body or an intermediate body delimited by a complementary intermediate surface of a contact surface of a preceding mold, the last mold being the negative of the top surface of the component; polymerizing the second material therein; removing the component from the flexible mold by deformation of the mold. Hardness can be improved by UV irradiation of a component.

主权项

1. A method for fabrication and mechanical and/or optical functionalization of an optically transparent timepiece component including a top surface and a bottom surface connected by an edge, the edge extending in thickness of the component, the method comprising:
choosing a first material which is either an optically transparent polymerizable material, or an acrylic polymer, or a methyl polymethacrylate; choosing at least a second polymerizable molding material for making at least one layer of the component, in a model composition, wherein the second material includes, as a proportion of total:
trimethylolpropane tri (methacrylate): 78.0%,pentaerythrityl tetraacrylate: 19.5%,bis (4-tert-butylcyclohexyl) peroxydicarbonate: 0.5%,1-benzoylcyclohexanol: 2.0%; shaping a basic body of the component, in the first material, the basic body being of smaller volume than that of the component and extending between the bottom surface and an intermediate surface connected by an intermediate edge, and mechanical and/or optical functionalization and structuring of the intermediate surface is performed, either during the shaping of the basic body in a mold, or during re-machining after the shaping; defining a number of layers to be superposed on the basic body to obtain the component; for each layer, making a mold having a contact surface which is either negative of the top surface, or a surface delimiting a solid of smaller internal volume than a final volume of the component, the mold including an edge having a bearing surface arranged to cooperate in a complementary manner in abutment on the intermediate surface or on the intermediate edge, and, in a case of a plurality of the molds, the molds each define an external volume of an intermediate body delimited by a complementary intermediate surface of the contact surface of the mold concerned, the intermediate volumes being incorporated in each other; at a distance from the intermediate surface corresponding to the thickness required for the component, and exactly positioned in relation to the intermediate surface, positioning the mold with the contact surface thereof facing the intermediate surface of the basic body, with the bearing surface in sealed contact with the intermediate surface or with the intermediate edge; injecting the second molding material, to completely fill with the second molding material a cavity delimited by the contact surface of the mold, the intermediate surface of the basic body, and the edge in sealed abutment via the bearing surface thereof on the intermediate surface or on the intermediate edge; leaving the second material injected into the cavity to polymerize until polymerization, to obtain either the component formed by assembling the basic body to at least the layer, or an intermediate body delimited by a complementary intermediate surface of the contact surface of the mold; removing the mold; repeating operations of forming a layer each time with a new mold whose internal volume is greater than a volume of the intermediate body obtained by a preceding mold, until obtaining the component with a final volume thereof.