Ohara, Inc.

Moriji Nozaki

Naoyuki Goto

Toshitaka Yagi

Yutaka Yamashita

A method for manufacturing a crystallized glass member having a curved shape includes a deforming step of deforming at least a portion of a glass plate into a curved shape by an external force that acts on the glass plate while maintaining the temperature of the glass plate within a first temperature range and precipitating crystals from the glass plate. In the method for manufacturing a crystallized glass member having a curved shape according to Claim, the first temperature range is from [At−40]° C. to [At+40]° C., wherein At (° C.) is a yield point of the glass plate.

Method for manufacturing crystallized glass member having curved shape

In a process for a thin-plate form glass molded body, an upper mold part having a pressing surface is used together with a lower mold part having a setting surface arranged to be opposed to the pressing surface. A melted glass lump is pressed between the pressing surface and setting surface. The pressing is performed to set the temperature (&#xb0; C.) of the thin-plate form glass molded body to a temperature of Tg&#x2212;20 or higher, and lower than Tg, wherein Tg represents the glass transition point (&#xb0; C.) of the glass, in a period of 0.8 second or less after the end of the pressing.

Process for producing a thin-plate form glass molded body

A glass forming apparatus and a glass forming method of high economical merit and high production efficiency are provided. More specifically, the glass forming apparatus has dies, in which at least one die is divided into a heat exchange unit and a press unit, and in the glass forming apparatus and glass forming method, the plane precision is improved in the contact dividing surfaces of the heat exchange unit and the press unit. A glass forming apparatus includes a die having a press surface for pressing a glass material, in which the die has a plurality of dies, and at least one die is divided into a heat exchange unit and a press unit. Preferably, the surface precision of at least one part of each dividing surface in contact with the heat exchange unit and the press unit has a flatness (PV) of 500 &#x3bc;m or less, and the plane precision of at least one part of the dividing surface has a surface roughness (Ra) of 100 &#x3bc;m or less.

Glass forming apparatus and glass forming method

A glass forming apparatus and a glass forming method are provided, which are capable of retaining the whole press surface at favorable temperatures for pressing glass, and forming a high-quality, efficient glass form. An upper die having a part formed such that the wall thickness of a bottom part, provided as an example of an opposite press surface, decreases gradually from the outside to the inside and the bottom part is formed as a part of the inner wall. In other words, the heat exchange chamber is in approximately a circular truncated cone shape.

Growing community of inventors

Sagamihara, Japan

Moriji Nozaki