RU2556647C1 - Apparatus for moulding glass articles - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: apparatus for moulding glass articles comprises a heating chamber, a hearth with counterweights, a mechanism for raising and lowering the hearth connected to the hearth by a rod. A mould is mounted on the hearth. The mould is mounted in a metal box having a configuration of sidewalls which corresponds to the mould, and the height of the sidewalls of the box is greater than that of the mould by 40-60 mm.

EFFECT: faster moulding and lower power consumption.

3 dwg

Description

The invention relates to the building materials industry, in particular to the field of production of curved glass products with complex curvature of the surface, used, for example, as a protective glazing of lighting elements (taxi lights) located in the lower part of the wings of aircraft.

Furnaces or batch plants are usually used to bend such products.

A device for glass molding is known, comprising a furnace mounted to move its arch and side parts relative to the shape of the molding located on the fixed hearth of the furnace according to ed. testimonial. SU No. 511300, IPC С03В 23/02, publ. 04/25/1976.

A disadvantage of the known device is that after heating the furnace and the bending form located therein to the glass softening temperature, its arch and side parts are raised to their highest position to place the flat glass workpiece on a heated mold that is outside the furnace space. During this period of time there is a large heat loss both in the working space of the furnace and from the hearth and the shape of the bending, which leads to high energy costs and an increase in the time of the bending process.

Closest to the invention is a glass hemisphere bending apparatus comprising a heating chamber vertically moving below with counterweights, a hearth raising and lowering mechanism by means of a rod connected to it, and a bending form with a continuous curvature of the forming surface is located on the hearth. (Zheludkov D.D. et al. Installation of molding glass hemispheres. Information sheet VIMI No. 86-2144, publ. 1986).

A disadvantage of the known installation is that after heating the chamber and the bending mold located on its bottom to the softening temperature, the glass is lowered to its lowest position in order to place a flat glass blank on the mold, which, together with the hearth, is outside the space of the heating chamber. During this period of time, there is a large heat loss from the hearth and the bending form located on it. This circumstance leads to high energy costs and an increase in the time of the bending process.

The objective of the invention is to reduce energy consumption and time of the bending process compared to the prototype.

This task is achieved by the fact that the proposed installation of bending glass products containing a heating chamber, under counterweights, a mechanism for raising and lowering the hearth, connected to it by means of a rod, and a bending form mounted on the hearth, characterized in that the form is placed in a metal box with a configuration side walls corresponding to the shape of the bending, and the height of the side walls of the box exceeds the height of the form by 40-60 mm.

Placing a bending mold in a metal duct with a side wall configuration corresponding to the bending mold provides a higher temperature inside the duct compared to the rest of the hearth when open when placing a flat glass blank on the bending mold. The height of the side walls of the box is determined by the authors based on the actual dimensions of the shape of the bending and, accordingly, glass blanks designed to produce bent glass products for the protective glazing of lighting elements (taxi lights) of various types of aircraft. It was found that with relatively small overall dimensions of the protective glazing, the height of the side walls of the box is 40 mm, and with the largest possible dimensions - 60 mm.

Figure 1 - installation with the closed position of the hearth.

Figure 2 - installation with the open position of the hearth.

Figure 3 - form of bending with the box.

The installation comprises a heating chamber 1 and under 2, connected to the rod 3. The heating chamber 1 and under 2 are mounted on a metal frame 4 with a mechanism 5 and balances 6 to move the rod 3 vertically from the extreme position of the hearth 2 (Fig. 1) to the lowermost the position of the hearth 2 (Fig. 2) and, accordingly, vice versa. On the bottom 2 there is a bending form 7 in a metal box 8. The height of the side walls of the box 8 relative to the height of the bending form 7 is equal to the value h (Fig. 3).

Installation works as follows.

After heating the chamber 1 (Fig. 1) to a glass softening temperature and holding for 30-40 minutes, lower it under 2 to its lowest position (Fig. 2) using mechanism 5 and counterweights 6. Next, a flat glass blank with specified geometric dimensions is placed on form 7 with a given curvature of the forming surface and placed in a metal box 8. In this case, the height of the side walls of the box 8 relative to the height of the molding form 7 is equal to the value of h (Fig. 3). Then under 2 raise to its highest position (Fig. 1) using mechanism 5 and balances 6. After heating the glass to a softening temperature of the glass and holding for a time sufficient to bend the glass to a given complex curvature of the surface of the mold 7 under the action of its own weight of glass , heating the chamber 1 is turned off and bent glass work is annealed.

Example. It is necessary to bend glass workpieces to a given complex surface curvature, intended to obtain protective glazing for the backlight elements (taxi lights) of aircraft. In this case, molds with given surface curvature and overall dimensions are used. The molds are made of quartz ceramic and placed in boxes made of heat-resistant stainless steel. The installation has the following parameters: the diameter of the working space of the heating chamber is 650 mm, the height is 400 mm. At the same time, glass blanks of three types of sizes are molded on three shapes placed in boxes with different heights of their side walls relative to the height of the shapes of molding (Table).

Table Overall dimensions of glass blanks, mm The height of the side walls of the box relative to the height of the form (h), mm 420 × 250 40 480 × 350 fifty 540 × 450 60

A batch of the above bent glass blanks was obtained. At the same time, energy costs amounted to 70%, and the time of the process of bending 80% compared with the prototype.

Information sources

1. Auth. testimonial. SU No. 511300, IPC С03В 23/02, publ. 04/25/1976.

2. Zheludkov D.D. et al. Glass hemisphere bending installation. Information leaflet of VIMI No. 86-2144, publ. 1986.

Claims (1)

A glass molding installation, comprising a heating chamber, with counterweights, a hearth raising and lowering mechanism connected to it by a rod, and a molding shape mounted on the hearth, characterized in that the shape is installed in a metal box with a side wall configuration corresponding to the molding shape, and the height of the side walls of the box exceeds the height of the form by 40-60 mm.

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