Box type annealing furnace with high uniformity and annealing method thereof

Abstract

The invention discloses a box type annealing furnace with high uniformity and an annealing method thereof, belongs to the technical field of heat treatment of optical materials, and is used for mainly solving the problem of poor annealing uniformity in a conventional annealing technology. The box type annealing furnace is mainly characterized in that the box type annealing furnace is a cubic box type annealing furnace having a square horizontal cross section; a hearth of the box type annealing furnace is provided with heating elements along the walls at the periphery, and the heating elements are externally provided with heat conduction plates; the middle part of the hearth of the box type annealing furnace is provided with a three-dimensional heating column, the heating column is fixed on a rotary shaft passing through the top of the box type annealing furnace, and the rotary shaft is connected with a transmission device outside the furnace. The temperature field uniformity of the annealing furnace is greatly improved, products can have the temperature rapidly kept consistent with the temperature field during heating and cooling, and the temperatures of the center and the surface of the products more tend to be consistent. The products annealed by using the device and the method have good individual uniformity, and the whole furnace products are highly consistent, and thus the device and the method are suitable for annealing of products of high-end optical devices.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of optical materials, in particular to a device for precision annealing of optical glass or optical elements. Background technique [0002] Products such as optical glass or components used as optical systems drop from high temperature to low temperature during production and molding. The product is restricted by conditions such as shape, cooling rate and ambient temperature difference. The cooling rate of the edge and center of the product is quite different. That is, the thermal history experienced by each part is different, resulting in thermal stress inside the product and optical inhomogeneity. For example, there will be differences in stress and refractive index between the edge and middle of the same product. To eliminate the internal stress and optical inhomogeneity of the product, the edge and middle of the product must experience the same thermal history again, which requires seco...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the annealing consistency of optical glass products, provide a box-type annealing furnace with reasonable structure and high uniformity and annealing method thereof, and solve the problem of uneven temperature field in the annealing furnace filled with glass. Improve the uniformity of the temperature field in the annealing furnace and realize the precise annealing of optical glass products

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