SU1229188A1 - Method of pressing glass articles - Google Patents

Description

The invention relates to glass engineering and can be used in the manufacture of glass products, such as kinescope screens, by pressing on carousel automatic presses.

The purpose of the invention is to increase the quality of products and increase their output.

Figures 1-4 show the dependency graphs explaining the essence of the proposed method.

Theoretical and experimental studies of the effects of initial temperatures, cooling conditions, thicknesses and thermal conductivities of the press tool on the level of temperature gradients and, accordingly, residual stresses that cause the occurrence of defects are carried out.

When pressing glassware from molten glass mass, intensive heat extraction from laminated glass is necessary to ensure cooling; Furthermore, to ensure quality products, from the point of view of the occurrence of surface defects, the temperature of glassforming 1CYX surfaces should be within 350-450 C.

Example. Calculate the thickness of the press tool for pressing the screen of a 25LK2T color kinescope, whose thickness, 007 m, is the average thermal diffusivity of C-93-2 glass, from which the screen is made for a temperature range of 0-1000 0 and 0.9-10 m2 / s. For the manufacture of a press tool, molybdenum cast iron with thermal diffusivity a 3-y is 11-10. The temperature of the glass melt at the time of the start of the screen pressing operation

1020 ° C (tg).

For the given initial data, the matrix and punch thickness are calculated by the formulas:

fc 0,55

(12)

Substituting the original data in the ratio (1) and (2), we get

„E, - 0.9-10 mg / s and, J - TG pgT 7

0.007 m-11-10- 0, 75 (3)

CiO, 9-

About S 1TSMVCg, GG /, H

 --Т) 7ШТ,

Solving inequalities (3) and (4), we have

t.liOjLOOU.LJ. .

0,

0.9 10-

0, 250,007. 10 J

  0,940- - g

- - llOjLOOLJJJJjOl 0.9.10-

(five)

(6)

Performing a calculation in expressions (, 5), (6), we obtain the boundaries of the dimension, and t:

0.023 m g 0.064 m; (7)

0.021 m R .. t 0.047 m. (8)

Calculate the temperature of the matrix and the punch by the formulas

0.28

t,

&0.44;

t.

0.28 - 0.44

at glass melt temperature t.

(9)

 1020 s

thirty

0.28 -1

and, 44

285.6 ° С t, i448.8 ° С ,, similarly for 285.6 ° С s tj, 448.8 ° С.

When pressing kinescopes 25LK2TS use a matrix of thickness P,

: 0.039 m and punch with a thickness of 7 0.028 m, and the temperature of the die and punch at the initial moment of pressing t, 295 C, t 344 C.

For a 16LK1B kinescope screen with a thickness of f. 0.0045 m of glass C-93-2 and when the press tool is made of molybdenum iron, the thickness of the die should be in the range of 0.0656.6 f, 0.041 m, and the punch

0.0123 fc Y 0.03 m. When pressing 16LK1B kinescope screens, a matrix with a thickness of f, 0.024 m and a punch with a thickness of f 0.016 m is used. The proposed technical solution

provides the possibility of choosing the optimum initial temperature and thickness of the pressing tool depending on the initial glass mass temperature, glass thickness and thermal diffusivity of materials, the minimum level of temperature gradients and residual stresses, high mechanical and temperature

3 .17291884

the stability of glassware, the lower the increase in the percentage of the yield of the number of pressing defects and. products.

fPuz.l

t - tonm

O.Z50,30,55

 FIG. Have

gredi i

Editor N. Gunko

0gl

Compiled by V. Yudin

Tehred M. Morgental Proofreader L. Patay

0.75

hSlfJ}

2416/20

Circulation 457 Subscription

VNSHSHI State; Ark Committee of the USSR

Inventions and discoveries 113035, Moscow, 1-35, Raushsk nab. 4/5

Production and Printing Enterprise 5 g, Uzhgorod, st. Project, 4

Claims (1)

METHOD FOR PRESSING GLASS PRODUCTS, including the supply of glass melt into the matrix, pressing it with the punch of the product with constant air cooling, characterized in that, in order to improve the quality of products and increase their output, the thickness of the matrix and punch is ° · ^3ί τ2 * 0.25 ¢ 0.55, C ^and 2 wherein E ,, £ _2, f ₃ - thickness sootvetststvenno punch matrix and glassware, mj and _{(and 2,} and _e - temperaturoprovod, respectively NOSTA matrix punch, glassware, ² m / s and the temperature of the matrix, the punch and molten glass at the initial moment of pressing is 0.28 έ £ 0.44; H 0.28 <-H. from 0.44 h where (L with t ₂ , Cz is the temperature of the matrix, punch and glass, respectively, ° C.