Annealing process for improving mechanical property of glass

Abstract

The invention discloses an annealing process for improving mechanical property of glass. The annealing process includes the following steps that firstly, freshly formed glass is subjected to primary annealing; secondly, the glass after primary annealing is quickly cooled; thirdly, the glass after primary annealing is slowly cooled; fourthly, then the glass obtained by primary annealing is slowly heated to the optimal annealing temperature to be subjected to secondary annealing, and secondary annealing is conducted for 3 minutes by adopting the optimal temperature and for 3 minutes by adoptingthe lowest temperature; fifthly, the glass after secondary annealing is subjected to important cooling, and permanent stress is prevented from producing inside the glass; and sixthly, then the glass after important cooling is quickly cooled, and thus the finished glass is obtained. According to the annealing process for improving the mechanical property of the glass, the annealing effect of the glass is improved, the content of residual stress inside the glass after forming is decreased, meanwhile, the permanent stress after forming of the glass is reduced to the minimum, and thus the mechanical property of the glass after forming is improved, so that the glass is more stable.

Description

technical field [0001] The invention relates to the technical field of glass processing, in particular to an annealing process for improving the mechanical properties of glass. Background technique [0002] The production process of glass includes: batching, melting, forming, annealing and other processes. Among them, the annealing process of glass is the most important link in the glass production process. Glass annealing mainly refers to placing the glass in the annealing kiln for a long enough time. Glass annealing can prevent the glass from cooling by annealing the temperature range or cooling down at a slow rate so that permanent stress and temporary stress exceeding the allowable range are no longer generated, or the process of reducing or eliminating the thermal stress generated in the glass as much as possible. Too fast and bursting occurs. [0003] However, during the glass annealing process, when the temperature of the glass is lowered to normal temperature and th...

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Problems solved by technology

[0004] The object of the present invention is to provide an annealing process for improving the mechanical properties of glass, so as to solve the problem in the glass annealing process proposed in the above background technology. There is still thermal stress, which is called permanent stress or residual stress. Most glass annealing does not pay much attention to eliminate or reduce the permanent stress, resulting in high permanent stress of the glass as a whole, resulting in very low strength of the glass after molding , and even the glass may burst directly, and most of the existing glass annealing processes only anneal after the glass is cooled, resulting in residual permanent stress that may be left at the beginning, resulting in incomplete removal of permanent stress and lower mechanical properties of the glass question