DE10102576B4 - Process for producing a curved stove or fireplace window made of glass ceramic and associated ceramization mold - Google Patents

Abstract

Method for producing a curved stove or fireplace window made of glass ceramic by gravity deformation from a flat green glass plate, comprising the steps:
Provision of a ceramization mold which has a central part which is bow-shaped and corresponding to the arch to be formed, with molded-on support strips,
- placing the flat green glass plate on the support ledges,
- heating the green glass plate to the ceramization temperature,
- Support the lowering of the softened green glass plate by a rolling movement in the transition area between the support strips and the middle part, and
- ceramizing the deformed green glass plate,

Description

The invention relates to a method for the production of a curved stove or fireplace window made of glass ceramic by gravity deformation from a flat green glass plate.

The invention further relates to a associated form of ceramization.

Find such curved glass ceramic bodies typically as viewing panels for stoves and fireplaces.

In the manufacture of such curved glass ceramic bodies by gravity deformation is first known methods a so-called green glass body in Manufactured plate shape that is inherently stable. Then will this green glass plate placed on a ceramization mold at room temperature, the one adapted to the geometric structure of the curved glass ceramic body, him mechanically in the ceramic manufacturing process supportive holding mold surface having. For this purpose, the ceramization form has to be shaped Correspondingly arched lowered middle section on which is operationally horizontal on both sides running support strips are formed at an angle. For ceramization becomes the green glass plate with the ceramization form first warmed from room temperature to the ceramization temperature. there it comes initially dimensionally stable green glass plate in a soft state, which due to the gravity of the over The middle section of the green glass plate part located in the mold drops and stick to its arcuate form surface invests.

With this automatic gravity reduction can in the angled transition area between support ledges and central part of the ceramization form during the Lowering scratches, prints, Deformations etc. of the softened green glass body occur, in particular the appearance of the later Keramisierungskörpers adversely affect.

The invention is based, which selbstätige To support gravity reduction in the aforementioned transition areas so that none unwanted such scratches, marks, deformations and the like Deformations of the lowered green glass body occur.

• – Bereitstellen einer Keramisierungsform, die ein dem zu formenden Bogen entsprechend bogenförmig abgesenktes Mittelteil mit angeformten Auflageleisten aufweist,
• – Auflegen der flachen Grünglasplatte auf die Auflageleisten,
• – Erwärmen der aufgelegten Grünglasplatte auf Keramisierungstemperatur,
• – Unterstützen des Absenkens der erweichten Grünglasplatte durch eine Rollbewegung im Übergangsbereich zwischen Auflageleisten und Mittelteil, und
• – Keramisieren des verformten Grünglaskörpers,

und zum anderen durch eine zugehörige Keramisierungsform, mit:

• – einem dem zu formenden Bogen entsprechend bogenförmig abgesenkten Mittelteil, an dem beidseitig betrieblich horizontal verlaufende Auflageleisten winklig angeformt sind, und mit
• – jeweils im winkligen Übergangsbereich zwischen Auflageleiste und Mittelteil drehbar angebrachten Ablaufrollen.

This object is achieved according to the invention once by a method for producing a curved stove or fireplace window made of glass ceramic by gravity deformation from a flat green glass plate, with the steps:

• Provision of a ceramization mold which has a central part which is bow-shaped and corresponding to the arch to be formed, with molded-on support strips,
• - placing the flat green glass plate on the support ledges,
• - heating the green glass plate to the ceramization temperature,
• - Support the lowering of the softened green glass plate by a rolling movement in the transition area between the support strips and the middle part, and
• - ceramizing the deformed green glass body,

and on the other hand through an associated ceramization form, with:

• - An arched lower part corresponding to the arch to be formed, on which operating strips which run horizontally on both sides are formed at an angle, and with
• - In each case in the angled transition area between the support bar and the middle part of the rotating castors.

The rotatably mounted in the transition area Support process roles by a rolling motion during the automatic lowering of gravity of the green glass body this Lowering movement and thus prevent unwanted deformation of the soften green glass body in Shape of scratches, prints, Deformations and the like.

The US-A-2,176,999 describes a method and an associated form for angled bending of glass plates while maintaining the glassy state, which should be strong, kink-like bends. The glass plate to be bent rests on two rollers, is heated to its full length and width by gas burners to below the softening point, and it is finally heated locally at the kink above the softening point by means of a vertically movable heating device, the heating device being moved by gravity sinking kink follows.

If you arrange a variety of such Heaters next to each other, so can the glass plate arc be bent.

In the case of the invention, the green glass plate to be bent rests on support strips of the ceramization form, whereas in the known case the glass plate to be bent rests solely on the rollers, which are therefore pure support rollers. In the case of the invention, however, the roles have a different function. The support function is already fulfilled by the support strips alone, ie the ceramization form is fully functional even without the rollers. In the angled transition area between the horizontal support bar and the curved mold part, the rollers should provide a rolling run-off surface that supports the lowering movement of the green glass plate. In this transitional area they are literally in the form of tegriert, such that a part of the roller circumference forms a movable, continuous transition surface between the support surface and the mold surface. The rollers are therefore arranged in the angled transition area, pure "run-off rollers". They require the angled transition between the horizontal support bar and the form. This angled transition does not exist in the known case.

Training of the roles and their attachment to the ceramic form can be different Way. in principle can the arrangement according to a first embodiment of the invention be made so that the drain rollers as Solid cylinders are formed and rotatable via molded pins are stored in the form.

An easier twist of the Drainage is given if according to a second embodiment the invention, the drain rollers are designed as a hollow cylinder and rotatably supported on a rod fixed in the mold are.

The middle part of the ceramization form can vary depending on the application of the manufactured Keramisierungskörpers, be configured.

A part-cylindrical deformation To achieve, the shape is designed so that the cross section of the central part circular arc is.

For For other purposes, the shape is such that the cross section the middle part is trough-shaped is, or that the Cross section of the central part is trough-shaped.

Configurations are also possible at which the cross section of the central part is asymmetrical.

Using the exemplary embodiments shown in the drawing the invention becomes closer described.

Show it:

1 in a longitudinal section representation, a ceramization mold for producing a glass ceramic body according to the method according to the invention, consisting of a circularly curved, lowered central part with angularly shaped, horizontally running support strips,

2 a representation accordingly 1 , but with a trough-shaped middle section, and

3 a representation accordingly 1 , but with a gutter-configured middle section.

The 1 shows a longitudinal section representation of a first embodiment of a ceramicization form according to the invention 1 for the production of curved glass ceramic bodies from a flat green glass plate 2 by gravity deformation according to the inventive method.

The ceramization form has a central part which is lowered in the shape of an arc, corresponding to the arc to be shaped, here a circular arc 3 , on the support strips that run horizontally on both sides 4 are formed at an angle. On these support ledges 4 lies the green glass plate to be deformed, which is stable in itself. Form 1 itself rests on supports 5 with which she gets up on a conveyor belt (not shown). The depth of the ceramic form (perpendicular to the plane of the drawing) is determined by the height of the glass ceramic body to be molded.

Find such glass ceramic bodies preferably as stove / fireplace windows Application, predominantly bordered in metallic frame parts. Recently, such viewing panels have also become without frame demands, which makes it even stronger care must be taken that just no disturbing edges irregularities occur when ceramizing.

The ceramization form is made with the conveyor belt 1 promoted by the individual treatment stations in the known ceramization.

First, the ceramization form 1 with the green glass plate on top 2 transported to a station where it is heated to the ceramization temperature. The green glass plate softens, and you over the middle part 3 lying section automatically lowers in the direction of the arrow due to gravity and finally settles on the circular arc of the central section 3 on. In the transition area between the middle part 3 and the support ledges 4 are run-off roles 6 rotatable on the form 1 appropriate. Through these drain rollers 6 the lowering movement of the softened green glass plate 2 supports, such that no undesired impairment of the green glass plate 2 entry. The shaped green glass body is then ceramized using the known thermal treatment steps.

All Parts of the ceramization form consist of a very temperature stable Material, for example from a material that is commercially available under known as the Quarzal.

The drain rollers 6 can be designed as a solid cylinder, the molded pins in the form 1 are rotatably supported. Alternatively, they can also consist of a hollow cylinder which is rotatably received on a rod anchored in the mold.

With the ceramization mold according to the invention, depending on the shape of the central part 3 , manufacture differently curved glass ceramic bodies by gravity deformation.

Instead of the circular shape 1 can therefore with the ceramization form 2 through a trough-shaped middle part 3 a trough-shaped curved glass ceramic body can be produced.

The ceramization form after 3 has a gutter-shaped middle part 3 on with the rin NEN-like glass ceramic body can be produced.

The 1 to 3 only show examples. Other configurations are possible, including those with an asymmetrical shape.

Claims (8)

Method of making a curved furnace or fireplace window made of glass ceramic due to gravity deformation from a flat green glass plate, with the steps: - Provide a ceramization form that corresponds to the arch to be formed arc has a lowered middle section with molded support strips, - Hang up the flat green glass plate on the support ledges, - heating the applied green glass plate on ceramization temperature, - Support the lowering of the softened Green glass plate through a rolling movement in the transition area between support strips and middle section, and - Ceramicize the deformed green glass plate, Ceramization mold for the production of curved stove or fireplace panes made of glass ceramic by gravity deformation from a flat green glass plate ( 2 ), with - an arched lower part corresponding to the arch to be formed ( 3 ), on which support ledges running horizontally on both sides ( 4 ) are formed at an angle, and with - each in the angled transition area between the support bar ( 4 ) and middle section ( 3 ) rotatably mounted drain rollers ( 6 ). Ceramization mold according to claim 2, characterized in that the drain rollers ( 6 ) are designed as solid cylinders and are rotatably mounted in the mold via molded pins. Ceramization mold according to claim 2, characterized in that the drain rollers ( 6 ) are designed as a hollow cylinder and are rotatably supported on a rod fixed in the mold. Ceramization mold according to one of claims 2 to 4, characterized in that the Cross section of the central part is circular. Ceramization mold according to one of claims 2 to 4, characterized in that the Cross section of the central part is trough-shaped. Ceramization mold according to one of claims 2 to 4, characterized in that the Cross section of the central part is trough-shaped. Ceramization mold according to one of claims 2 to 4, characterized in that the Cross section of the central part is asymmetrical.