A kind of glass capillary and preparation method thereof

Abstract

The present invention discloses a glass capillary and its preparation method. The method is: divide the glass rod into two half of the round stick, and the semi -circular sticks are produced on the semi -round sticks that meet the design requirements of the design requirements;The geometric center of the groove makes the first cold machining of each circular rod into a combination stick; arranges several first glass tubes, combined sticks, and second glass tubes to make glass capillary embryos;The capillary embryo is controlled and pulled into a glass capillary long blank; according to the product requirements, the glass capillary length of the glass is made of second cold processing into the finished product of the glass cap.The glass capacity preparation method provided by the present invention is simple. The combination rod composed of the first glass tube, the two -half round rods, and the second glass tube can achieve a good contraction and combination, and the slot spacing and slot size accuracy is high to avoid quality defects.Realize the preparation of low -cost, high -precision, high -efficiency glass hair tube.

Description

technical field [0001] The invention relates to an optical fiber communication device system, in particular to a glass capillary and a preparation method thereof. Background technique [0002] Terminology Explanation: [0003] Glass capillary: a thin tube with an inner diameter of less than or equal to 1 mm made of glass material, of which the glass capillary used for optical communication is made of high borosilicate glass material. [0004] Outer inner diameter ratio: the ratio of the outer diameter to the inner diameter of the glass tube, the ratio of glass capillaries used in optical fiber communication is usually greater than 7. [0005] In order to reduce the loss of signal in connection or to achieve specific functions in optical fiber communication devices, it is necessary to use glass capillaries to precisely position single or multiple optical fibers. Due to the advantages of high positioning accuracy (outer diameter dimensional tolerance ± 0.005mm, inner diamete...

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Problems solved by technology

[0008] However, method 1 has very strict requirements on the performance of the mold, and because the forming temperature of high borosilicate glass is as high as 1260°C, the material will have problems such as oxidation, softening, deformation, and brittle cracking at this high temperature, making it difficult to produce high-precision blanks. tube, the process is difficult to realize, the yield is low, and the manufacturing cost is high

In method 2, it is difficult to achieve dense packing of glass filaments in the glass tube, so the positioning accuracy of the inner glass tube is low. At the same time, due to the existence of a large number of voids and the glass filament interface, the contraction of these voids under negative pressure during the drawing process will cause irregularities in the outer tube. Regular deformation and changes in the size and position of the inner tube, and due to the existence of a large number of glass filament interfaces, glass is prone to crystallization during the drawing process, resulting in micropore deformation, dislocation, internal gas lines, crystallization and other undesirable phenomena, resulting in Low yield and high manufacturing cost

In method 3, according to the theory of precision mechanics, when the hole depth is greater than 2.5 times the hole diameter, the processing accuracy will decrease significantly with the increase of the depth; after calculation, the inner hole size of the fiber optic communication glass capillary rod should be less than 4mm, and the length should be greater than 400mm, the depth-to-diameter ratio is greater than 100 times. This kind of deep and long hole processing requires high precision of processing equipment, high processing difficulty, low processing efficiency and difficult to meet the processing accuracy requirements.

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