SU1680646A1 - Device for bending and annealing glass - Google Patents

Abstract

The invention relates to the construction industry and building materials, to glass production and can be used in the production of curved automotive glass. In order to increase productivity and reduce the area by combining the processes of bending and quenching, the device is made with half-molds having cavities for accommodating inductors. The use of induction heating, as having a number of advantages over conventional resistive, including energy, is currently one of the most promising areas in the glass industry, especially its use in processes associated with reheating glass for its processing, in particular, bending and quenching. The rapidity of heating, together with the high uniformity of temperature distribution over the glass area, provides creators with a new technology with a number of advantages that can bring it to the forefront in the world. In particular, under the conditions of use, along with induction heating of contact cooling, there is a unique opportunity to create a combined technology in which heating, bending and quenching are carried out in one position. 3 il. gN

Description

The invention relates to the building materials industry, more specifically to the glass industry and can be used in the production of curved automotive glass.

The purpose of the invention is to increase productivity and reduce the area by combining the processes of bending and quenching.

FIG. 1 shows half-molds; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one.

The device for bending and tempering the glass contains the upper 1 and lower 2 coupling halves for bending and tempering the glass sheet 3, made of highly heat-conducting material, such as copper, in the cavities 4-9 of which inductors 10-15 and means for supplying a cooling agent, arranged in the form of channels 16-21 in half-forms 1 and 2.

Zigzag water-cooled flat inductors can be used as inductors 10-15.

The proposed device works as follows.

Glass sheet 3 is placed between half-molds 1 and 2 and includes inductors 10-15. Under the action of induction currents, half-molds 1 and 2 are intensely heated.

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By infrared radiation, half-molds 1 and 2 start to heat up sheet 3 of the stack. Since the central part of the upper mold half 1 is closer to the central part of the glass sheet 3, it is heated more intensively. When this part of the glass reaches 640 ° C, the glass begins to deform and, due to its own weight, bend.

At the same time, the upper half-mold 1 starts to move downwards. The distance between the heated half-molds 1 and 2 and the glass sheet 3 is reduced and the remaining parts of the glass 3.15 begin to heat up more intensively.

The deformation of glass 3 is increasing. As the upper mold half moves, sheet 3 of glass lies on the surface of the lower mold half, i.e. the glass 3 is molded and takes a predetermined shape. The movement of the top 20 half-mold 2 takes place before the colored sheet 3 of the glass touches.

After the sheet 3 of glass is sandwiched between the half-molds of 1 m 2, the inductors 10-15 are turned off and the heating of the glass 3 is stopped. Then a cooling agent, for example compressed air, is fed through the channels 16-21, and due to the high thermal conductivity of the material of half-molds 1 and 2, intensive cooling of the glass occurs.30

The cooling mode is selected so that the rate of cooling of glass 3, its thickness and chemical composition determine the degree of hardening of the products. After the quenching process is completed, the upper mold half is lifted and the finished product is removed.

Thus, using the proposed technical solution allows reducing equipment dimensions and reducing production areas occupied by equipment, increasing productivity by eliminating transport operations at heating, bending and quenching positions and shortening heating time and combining the advantages of bending and pressing glass.

Claims (1)

Apparatus of the Invention A device for bending and tempering glass, comprising half-molds of highly heat-conducting material, a heat source and means for supplying a cooling agent to the half-molds, characterized in that, in order to increase productivity and reduce the areas by combining the processes of bending and tempering, the half-forms are made from cavity MI, in which at least three inductors are mounted. I / I 17 8 ft 15 1 A Fig. / IB 3/7 20 FIG. 2 B-6 Fig.Z