A method for controlling the thickness of overflow brick sheet forming

Abstract

The invention belongs to the field of glass substrate manufacturing, and discloses a thickness control method for overflow brick sheet forming, which is characterized in that it includes the following steps: S1: obtaining the free flow thickness distribution of glass overflow on the overflow surface of the overflow brick through simulation and free flow velocity distribution; S2: Calculation of the equivalent drawing velocity distribution of the overflow guide plate and the critical equivalent drawing velocity of the overflow guide plate; S3: Calculation of the equivalent drawing thickness distribution and forming thickness distribution of the glass overflow ;S5: Calculate the thickness range of the formed glass substrate; S6: When the thickness range of the formed glass substrate > the preset threshold, change the current parameters and repeat S1-S5; when the thickness range of the formed glass substrate ≤ the preset threshold , overflow brick processing and glass substrate production according to current parameters. It effectively solves the problem of fluctuations in the thickness of the glass substrate molding, and increases the production margin from the design, so that the thickness of the glass substrate molding can meet the demand, thereby reducing the complex requirements for process adjustment and maintaining the stability of the production line.

Description

technical field [0001] The invention belongs to the field of glass substrate manufacturing, and relates to a method for controlling the forming thickness of an overflow brick sheet. Background technique [0002] Glass substrates used in the field of flat panel display manufacturing such as general TFT-LCD (Thin Film Transistor Display) and PDP (Plasma Display Display) are manufactured by the overflow down-draw method, and in the molding process, molten glass melted in a glass melting furnace is supplied to Manufactured with a melt overflow down-draw molding device. Display manufacturing requires larger and larger glass substrates to improve production efficiency and reduce costs, but the larger the glass substrate, the more difficult it is to produce and the more complex the quality control of the glass substrate. [0003] The overflow brick is one of the core components of the glass substrate manufacturing and forming device. Among them, the control of the thickness unifo...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of the above-mentioned prior art that the thickness distribution of the glass substrate after the production of the glass substrate cannot meet the needs of use, and to provide a method for controlling the thickness of the overflow brick thin plate

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