Thermal stress relief process of prefabricated rod and thermal stress relief equipment thereof

Abstract

The invention discloses a thermal stress relief process of a prefabricated rod. The process includes: heating the prefabricated rod to a stress relief temperature; maintaining the prefabricated rod for a predetermined period of time at the stress relief temperature; cooling the prefabricated rod from the stress relief temperature to a predetermined temperature by a first predetermined cooling rate; cooling the prefabricated rod from the predetermined temperature to room temperature according to a second predetermined cooling rate, with the first predetermined cooling rate being smaller than the second predetermined cooling rate. Phased cooling is implemented at the cooling stage of the prefabricated rod to ensure that the internal heat of the prefabricated rod can be diffused slowly and evenly, thereby effectively avoiding generating new thermal stress in the thermal stress relief process of the prefabricated rod. The thermal stress relief process can effectively solve the problem of new thermal stress generated after prefabricated rod reheating for thermal stress relief. The invention also discloses prefabricated rod thermal stress relief equipment utilizing the process.

Description

technical field [0001] The present invention relates to the technical field of optical fiber manufacturing, more specifically, to a process for removing thermal stress of a pre-support rod, and also to a device for removing thermal stress of a pre-support rod using the above-mentioned process. Background technique [0002] People need to use a preform rod (commonly known as a light rod) when manufacturing an optical fiber. The internal structure of the optical fiber is formed in the preform rod, so the production of the preform rod is the most important part of the optical fiber process. [0003] During the manufacturing process of the preform, it often involves the process of cooling from high temperature. In this process, due to the intense and uneven temperature change, irregular stress will be generated in the preform, which is called thermal stress. Thermal stress is distinguished from mechanical stress. This irregular thermal stress will reduce the strength and therma...

AI Technical Summary

Problems solved by technology

This irregular thermal stress will reduce the strength and thermal stability of the product, and may even cause the glass to break itself during cooling, storage and mechanical processing after forming

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