Hot formed articles and method and apparatus for hot-forming
AssigneeSchott AG
InventorsBernd Hoppe, Andreas Hirsch, Ulrich Fotheringham, Michael Weisser, Paulette Onorato, Edward Skowron, Vijay Shanbhag
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Abstract
A method of hot forming of at least a part of an article is provided. The article includes a material selected from the group consisting of transparent and semitransparent materials. The method includes semi-homogeneously heating at least a part of the article by radiation and forming the heated part of the article.
Claims43
A method of forming of an article made of a transparent, semitransparent, or opaque material selected from the group consisting of glass, glass ceramic, and plastic, the method comprising:
- heating at least a part of said article with a radiation source;
- and
- forming said part of said article in a drawing process where a preform for said article is drawn to a smaller diameter, wherein said heating comprises radiation heating at least one section of the article having said smaller diameter with a first wavelength having a penetration depth larger than a dimension of the at least one section in the direction of the incident radiation and simultaneously irradiating at least one section of the perform with a second wavelength having a penetration depth lower than the dimension of the at least one section so that radiation having said first wavelength is guided via said article from said smaller diameter to said preform.
A method of processing a multi fiber bundle made of a transparent, semitransparent, or opaque material selected from the group consisting of glass, glass ceramic, and plastic, comprising:
- heating at least a part of said multi fiber bundle with a radiation source;
- and
- forming said part, wherein said heating comprises radiation heating at least one section of the article with a first wavelength having a penetration depth larger than a dimension of the part in the direction of the incident radiation and simultaneously with a second wavelength having a penetration depth lower than the dimension of the part, wherein said forming is performed in a drawing process to draw a preform for a fiber bundle to a smaller diameter, wherein said heating comprises irradiating said fiber bundle having the smaller diameter with radiation of said first wavelength so that said radiation of said first wavelength is guided via said fiber bundle with said smaller diameter to said preform so that at least a partly homogenization of radiation distribution in said preform is achieved.
A method of forming of an article made of a transparent, semitransparent, or opaque material selected from the group consisting of glass, glass ceramic, and plastic, the method comprising:
- drawing the article from a perform having a first region with a larger diameter to define a second region with a smaller diameter such that a tapered region is defined between the first and second regions;
- irradiating the first region of the article with radiation of a first wavelength having a penetration depth lower than the larger diameter;
- and
- irradiating, simultaneous to the irradiation of the first region, the second and tapered regions with radiation of a second wavelength having a penetration depth that is larger than the smaller diameter, wherein irradiating the second and tapered regions comprises irradiating with incident radiation at an angle so that the second wavelength is axially transported through the article to a central portion of the first region.
A method of forming of an article made of a transparent, semitransparent, or opaque material selected from the group consisting of glass, glass ceramic, and plastic, the method comprising:
- drawing the article from a perform having a first region with a larger diameter to define a second region with a smaller diameter such that a tapered region is defined between the first and second regions;
- irradiating the first region of the article with radiation of a first wavelength having a penetration depth lower than the larger diameter;
- and
- irradiating, simultaneous to the irradiation of the first region, the second region or the tapered region with radiation of a second wavelength having a penetration depth that is larger than the smaller diameter, wherein irradiating the second or tapered regions comprises irradiating with incident radiation at an angle so that the second wavelength is axially transported through the article to a central portion of the first region.
Dependencies are inferred from the claim text.