Overflow brick forming quality stability control method

Abstract

The invention discloses an overflow brick forming quality stability control method which comprises the following steps: S1, determining design parameters according to an overflow brick structure, determining a glass forming temperature T0 according to the forming viscosity of a molten glass material and a material viscosity-temperature characteristic curve, and setting a far-end wetting temperature increment delta T; S2, sequentially calculating overflow brick far-end wetting process parameters, overflow brick near-end wetting process parameters and overflow brick middle-end wetting process parameters; S3, carrying out far-end wetting according to the parameters determined in the S1 and the S2; S4, carrying out near-end wetting according to the parameters determined in the S1 and the S2; S5, carrying out middle wetting according to the parameters determined in the S1 and the S2. According to the design of a glass substrate product, the design of a forming device, the design of an overflow brick assembly and the lead-out amount required by wetting of the far end, the near end and the middle part of an overflow brick; the optimal wetting process is designed, the wetting effect of theoverflow brick is guaranteed, and therefore the phenomenon that due to the unreasonable wetting process, the forming quality of a production line fluctuates uncertainly is effectively avoided.

Description

technical field [0001] The invention belongs to the field of glass substrate manufacturing, in particular to a method for controlling the stable molding quality of overflow bricks. Background technique [0002] The glass substrates used in the production of flat panel displays such as TFT-LCD (Thin Film Transistor Display) and PDP (Plasma Display Panel) are manufactured by overflow down-drawing. In the forming process, molten glass melted by a glass melting furnace is supplied to Melt overflow down-draw molding device to manufacture. The control of glass substrate thickness uniformity, residual stress and warpage is one of the most important process technologies, and they are all closely related to the design, working state and temperature field control of formed overflow bricks. The overflow brick is one of the core components of the glass substrate manufacturing forming device. The structural design of the overflow brick and the process margin are one of the key factors f...

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Problems solved by technology

[0008] In order to solve the problems existing in the prior art, the present invention provides a control method for the stable quality of overflow bricks, which solves the problem that the unreasonable pre-wetting process of glass substrate leads to unstable quality of glass substrate products, thus affecting glass production. Line operation and yield improvement

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