Press-forming method and machine for glass

摘要

An object of the present invention is to provide a press-forming method for glass capable of uniformly heating press dies and a preform and preventing oxidation of the press dies. According to the press-forming method for glass of the present invention, a preform is placed between a pair of press dies in a press-forming chamber and the preform and the press dies are heated in an inert gas atmosphere. After the temperature of the press dies reaches a predetermined value, evacuation of the press-forming chamber is initiated. After the pressure of the press-forming chamber reaches a predetermined value and the temperature of the press-forming chamber are stabilized at a second predetermined value, the preform is press-formed. Preferably, an exhaust rate for evacuating the chamber is limited to a predetermined value or less.