Lower molding die, method for manufacturing lower molding die, method for manufacturing glass gob, and method for manufacturing glass molded article
AssigneeKonica Minolta Opto, Inc.
InventorsShunichi Hayamizu, Naoyuki Fukumoto, Kento Hasegawa
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Abstract
Disclosed is a lower molding die for receiving a molten glass droplet which is dripped. A cover layer is formed on a substrate with an intermediate layer therebetween, and a roughening process is performed on the surface of the cover layer in order to increase arithmetic average roughness Ra. The surface of the cover layer subjected to the roughening process has an arithmetic average roughness Ra of 0.01 μm or more, and an average length RSm of a roughness curvilinear element of 0.5 μm or less.
Claims9
A lower molding die for receiving a dropped molten glass droplet, the lower molding die comprising:
- a substrate;
- an intermediate layer formed on the substrate;
- and
- a cover layer formed on the intermediate layer,
- wherein a surface of the cover layer has been subjected to a roughening process for increasing an arithmetic average roughness Ra, and the surface of the cover layer has the arithmetic average roughness Ra of 0.01 μm or more and an average length RSm of a roughness curvilinear element of 0.5 μm or less.
A method for manufacturing a lower molding die for receiving a dropped molten glass droplet, the method comprising the steps of:
- forming an intermediate layer on a substrate;
- forming a cover layer on the intermediate layer;
- performing a roughening process on a surface of the cover layer to increase an arithmetic average roughness Ra,
- wherein the surface of the cover layer having been subjected to the roughening process has an arithmetic average roughness Ra of 0.01 μm or more and an average length RSm of a roughness curvilinear element of 0.05 μm or less.
Dependencies are inferred from the claim text.