SU1502492A1 - Method of producing precision glass pipes - Google Patents

Abstract

The invention relates to the glass industry. The goal is to expand the technological capabilities of the method and improve the quality of the tube. The method of manufacturing a precision glass tube, mainly for microsyringes and capillaries, having standard containers, is carried out by drawing out from the bulb the end part of the glass tube preform. The billet is placed in the heating space of the furnace and secured with another part in the grip of the billet feeding unit. The blank is made of a composite of several, at least two glass tubes placed one inside the other. The ratio of the inner diameter of the enclosing tube and the outer diameter of the enclosed tube is within: 1 * 98 D (nf) _N / D (bun) _N-1 ≤ 2, where N is the number of tubes (N ≥ 2)

D (nf) - internal diameter of the covering tube

D (nar) - the outer diameter of the covered tube. The linear thermal expansion coefficients of the above tubes are related by the inequality: α ₁ ≥ α ₂ ≥ α ₃ ≥ ... ≥ α _N , provided that Α _N - _N-1 10 ^. 10 ^-7 degrees ^-1 . In the process of drawing in the space between the glass tubes, an atmospheric vacuum in the range of 10 ^-2 to 10 ^-3 mm Hg is created. Art. 1 tab.

Description

The invention relates to glass industry, in particular to the production of glass fibers and precision glass tubes, and can be used in the manufacture of microsyringes, capillaries having standard containers, and other similar products.

The purpose of the invention is to expand the technological capabilities of the method and improve the quality of the tube.

The drawing shows a diagram of the process of drawing a precision glass tube.

The process is carried out as follows.

A set of glass tubes 1-3, placed one inside the other, is fixed at one end in the grip of a delivery unit (not shown). On the outer diameter of the largest tube set vacuum nozzle 4. llpo-i lun iio ioxuibiii i. - The assemblies are placed in the hot space of the furnace 5. When the tube assembly is heated, the capillary 6 is pulled out and the bulb 7 is formed. Subsequently, the tubes are pulled out using the hood mechanism 8. 1, onion 7 is formed, and the surfaces of tubes 1-3 are collected; and the U sealed coitacg is entered, and. Interstate between them through a vacuum pipe 4, which provides for a combination of atmospheric dilution, and pump out the air. In order to lose water to the iipviUH3HOi-inhn glass tubes, it is necessary that in the central tube .i; wound atmospheric pressure. For this, the end 9 of the central tube with a 5-pin vacuum port 4 should be connected to.

In the process of drawing out the glass tube, the scoop-d node 11, the assembly dachas are moved from the IOS1 to the aus: ty: korostk1 in the direction of the furnace i, new portions of the glass are fed: 1 off the bulb 7.

An example. OS vincc t is a ban from tre :; glass tubes: the central unit of the glass tube of the L-VO arch, and two ohBal I cis HJ glass 360, Parameter:, the cuttings glass is indicated in the table,

Exhaust conditions) 750 ° С, speed 0.02 MM / Cj I x 3.608 mm / g.

Size: au rpyuK i glass; 1,120 mm and

Wil.s gvgl cfi 1:; units; 1 gf. -i: erarat RA

VI O H; : arOVOr; OK oros Gb and IZHKI

 iij i, 1 and - Pigch O;., 1 1Ч) 1пю; D.

f)

and

bunk

1 2 1; M: 1n

hp

for bending but comparing with Tpyiji, Jii no luchennon peret / kk i HIJ 1 of the total amount of workpieces, increased by l - 20%. Atmospheric rarefaction in the space between the tubes soybean tavpi; . t, 2-10 m hp. Attitude i -syTVJe ..; -: ur C D1; am1; Tra tix of the wobble tube, for example tube 2 to the outer diameter, is covered) tube 1 should lie within the limits

1 P (i) P

D H TTn-l) where n is the number of tubes (), the sequence number of the tube, counted from the center of the assembly; internal diameter of the rolling frame, lm; outer diameter of the groove / ab tube, mm.

D

9H

D

Map

0

0

five

0

0

five

0

five,

At a ratio greater than 2, distortions form in the assembly, having a significant effect on the accuracy of the diameters of the finished glass tubes.

The linear thermal expansion coefficient (CTE) of the tubes must be related by the inequality

"P - oin-i 10 10

-one

hail

where,; o1.2; oi,; .... - CTE tubes.

This condition provides hardening of the tube in the process of its preparation. However, if the difference between CTE of the sssssdny tubes exceeds 10 1СГ, then residual stresses arise in the stretchable tube, which can lead to its spontaneous destruction,

In the process of tb (t in the space between the glass tubes, atmospheric rarefaction is created, ranging from

.3

iО up to 10 mm Hg At lower values than 10 mmHg, the sintering of the tubes takes place under pressure without intense intensity, which reduces the value of the strength of the stretchable tube for bending. At values of the Discontinuity greater than 10 mm Hg; o de (By Rmadi precision channel inner tube.

g use in the selection of tubes: iar vroE cii the ratio of the inner diameter of the covering tube and the outside, and of the covered tube in the pipe / telah

and Echi. -c 2

0 („„ p, (p-1)

It allows coaxially to place the tubes one into another and thus make the workpiece composite, which makes it possible to obtain thermoplastic glass tubes with a wide range of ratios between the internal and external diameters and will expand the technological capabilities of the method since known methods | 1. A wide range of diameters is difficult due to the impossibility of obtaining blanks of the required size.

Link CTE of the workpiece inequality tubes

оС, Oi,.,. five; (i.i., provided that about J, - from 1010 degrees, it allows to pick up the tubes of the workpiece in such a way that the LTEC will decrease from the center to the periphery.

what provides increase in durability of a tube on a bend and increases its quality.

The atmospheric rarefaction created during stretching in the space between the tubes promotes deep diffusion of the adjacent surfaces of the tubes and makes it possible to conduct an overlap at temperatures of 100–200 ° C above the softening temperatures of the glass, as a result of which the stretched tube creates a stressed structure enhances its flexural strength, which also guarantees the quality of the precision tubes manufactured,

The use of the proposed method of manufacturing a precision glass tube provides an increase in the yield of precision glass tubes after overplanting billets, an increase in bending strength of glass tubes by 20% compared with tubes obtained from a single piece, and an increase in the accuracy of glass tubes.

Claims (1)

Invention Formula A method of manufacturing a precision glass tube mainly for microsyringes and capillaries by pulling out from the bulb the end portion of the glass tubular billet placed in the heating space of the furnace and fixed by another part in the grip of the billet delivery unit, so that technological capabilities of the method and improving the quality of the tube, the blank is made from at least two glass tubes placed one inside the other. At the same time, the ratio of the inner diameter of the 5-covering tube and the outer diameter of the covered tube is within the limits of the MBP 0 TO (pgp 62, 0-In & n bunk Nar where n is the number of tubes (); internal diameter of the covering tube, mm; outer diameter of the covered tube, mm; and the linear thermal thermal expansion coefficients of the tubes are related by the inequality about, h, ..- upi " under the condition („. | 11010 degrees, and in the process of stretching in the space between the tubes, an atmospheric vacuum is created within mm Hg. Editor I. Derbak Compiled by L, Golubeva Tehred M. Didyk Proofreader M, Pojo Order 7820 Circulation 418 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. D. 4/5 Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101 Subscription