Method of stretching glass preform bar

Abstract

The invention discloses a method for stretching a glass prefabricated rod. The glass prefabricated rod is stretched in such a method that the upper end and the lower end of a glass prefabricated rod are respectively clamped on an upper clamp and a lower clamp to be orderly heated, and the glass prefabricated rod is stretched by the speed difference of the upper clamp and the lower clamp. In the stretching process, the stability of the stretching force is always guaranteed by adjusting the speed of the upper clamp, and the speed of the lower clamp is controlled by the set control diameter and the set point measurement diameter of a diameter measurer. The method for stretching a glass prefabricated rod is characterized in that a gravity sensor is used for measuring and reflecting the internal tension of the glass prefabricated rod of stretching force, and the performance of the unchanged volume of the glass prefabricated rod in the stretching process is used for controlling the start stretching period and the end stretching period of the glass prefabricated rod. The method for stretching a glass prefabricated rod has the characteristics of high stretching precision and high utilization rate of the glass prefabricated rod.

Description

technical field [0001] The invention relates to a stretching method of a glass preform, especially by using a gravity sensor to measure the internal tension of the glass preform reflecting the stretching force, and at the same time using the property that the volume of the glass preform does not change during the stretching process to control the glass preform A method for stretching a glass preform for initial stretching and final stretching. Background technique [0002] With the increasing size of glass preforms, the widely used horizontal flame stretching technology can no longer meet the requirements of preform stretching. The newer longitudinal electric furnace stretching technology has been extensively studied and has made rapid progress. At present, the longitudinal stretching method of the glass preform mainly adopts two upper and lower clamps to clamp the two ends of the glass preform up and down, and uses an electric furnace to sequentially soften the effective ar...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved and the technical task proposed by the present invention are to overcome the fact that the actual measurement control point in the initial stage and the end stage of the stretching in the prior art will deviate relative to the set measurement control point, resulting in the stretched glass preform The outer diameter fluctuates greatly and the defects of the glass preform cannot be fully utilized. It provides a method to measure the internal tension of the glass preform reflecting the stretching force by using a gravity sensor, and at the same time use the property that the volume of the glass preform does not change during the stretching process. Stretching method of glass preform for controlling initial stretching and final stretching of glass preform

Images