Method for manufacturing large-sized optical fiber preform rod guide cone

Abstract

The invention discloses a method for manufacturing a large-sized optical fiber preform rod guide cone. The method comprises the following steps: melting an optical fiber preform rod in a fiber drawing furnace; pulling the guide cone out and cooling to room temperature; scanning data of diameter change of the guide cone of the cooled optical fiber preform rod along the axial direction by using a laser diameter measuring instrument; drawing the shape of the guide cone according to the data scanned by the laser diameter measuring instrument; drawing a shape curve of a grinding tool which is complementary with the guide cone according to a drawn shape curve of the guide cone, and machining the outer surface of a basal body of the metal grinding tool with the curve; plating carborundum with granularity of 30-150 meshes and thickness of 2-8 mm on the surface of the basal body of the metal grinding tool to manufacture the grinding tool; grinding one end of a quartz socket tube by using the grinding tool to manufacture a conical head; butting the conical head against the quartz socket tube with a diameter which is not greater than the minimum diameter of the conical head on a welding lathe; drawing out a front cone.

Description

technical field [0001] The invention relates to the field of optical fibers, in particular to a method for manufacturing a large-size optical fiber preform lead cone. Background technique [0002] In recent years, the competition in the optical fiber industry has become more and more fierce, and the prices of optical fiber preforms, optical fibers and optical cables have also dropped for a time. Cost competition has gradually become the primary factor in the competition in the optical fiber market. Therefore, how to reduce the cost of products has become the common concern of major companies. Focus. [0003] The sleeve method can produce large-size optical fiber preforms, which can significantly improve the drawing efficiency of optical fibers. However, the optical fiber preform produced by the casing method needs to make a guide cone to improve the drawing efficiency of the preform and save materials. The shape of the lead cone is also an important factor that significant...

AI Technical Summary

Problems solved by technology

Due to the large wall thickness of the quartz sleeve of the large-sized optical fiber preform, it is difficult to melt and burn when welding on a welding lathe due to the extremely small thermal conductivity of the material, so the processing time is greatly increased, which will cause low drawing efficiency and fuel consumption. Serious waste

Therefore, this method is not suitable for the manufacture of lead cones for large-scale optical fiber preforms

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