Method of stretching glass preform bar
A preform and glass technology, which is applied to glass manufacturing equipment, manufacturing tools, etc., can solve the problems of insufficient utilization of glass preforms and large fluctuations in the outer diameter of glass preforms, so as to improve the utilization rate and improve the drawing precision. Effect
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[0016] The present invention will be further described below in conjunction with the accompanying drawings of the specification.
[0017] A method for stretching the glass preform is to clamp the upper and lower ends of the glass preform 2 on the upper clamp 1 and the lower clamp 5 for sequential heating, using the speed V1 of the upper clamp 1 and the speed V2 of the lower clamp 5 The glass preform 2 is stretched by the difference between the two. During the stretching process, the stability of the stretching force F is always ensured by adjusting the speed V1 of the upper clamp 1, and the diameter D0 and the setting are controlled by the setting of the diameter gauge 4 The fixed-point measuring diameter D01 controls the speed V2 of the clamp 5, which is characterized by: using the gravity sensor 12 to measure the internal tension of the glass preform reflecting the stretching force F, and using the constant volume of the glass preform during the stretching process The properties...
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