DE267220C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

CLASS 31c. GROUP

JOHANN RINGEL in STRASZBURG i. Els. Molding compound for casting molds for metal and glass. Patented in the German Empire on May 26, 1912.

The present invention relates to a molding compound, in particular for the casting of Metal, enamel, glass and the like, with which it is possible to achieve such shapes in previously unattainable forms To establish simplicity and cheapness and so against the present state to achieve a very significant advance in technology in the molding shop.

The new molding compound is made from pozzolan sand and plaster of paris, depending on which Different amounts can be applied to the material to be cast and if necessary with other, indifferent substances, such as B. kaolin, ocher, ultramarine and the like can be. The new mass is particularly characterized by * leaving it immediately for glass casting 'is suitable. A prerequisite for this is that they are on the before casting required high temperature can be heated without thereby a disintegration of the mold entry; on the other hand, the molding compound can easily be removed from the finished casting remove. A previous heating of the molding compound to a very high degree of heat is especially necessary with glass castings, because it depends on the degree of heating of the mold with the temperature of the casting different types of matting and a different type Shine of the glass casting can be generated. '

According to the information provided by the inventor, z. B. a moderately heated form in conjunction with a viscous glass casting compound a cast of great gloss in which the details appear rather blurry, which is very desirable from an artistic point of view in some cases. One very porous form heated to a bright red glow, results in connection with a possible thin casting compound a cast with strong matting, in which the details appear strong and sharp. Depending on the choice of the degree of heating of the shape, its porosity and the Depending on the degree of fluidity of the casting compound, various effects can be achieved. It exists in particular the artistically and practically valuable opportunity on a single one To achieve different types of matting by casting, by arbitrary determination the porosity, and by adding or leaving out tracheal cords.

Molds for glass are made using 54 parts of plaster of paris and 96 to 142 parts Pozzolana produced. The following mixtures are used in detail:

For metal you use ......... 54 parts of plaster and 142 to 183 parts of pozzolan

- - - Enamel 54 - - - 96 ·

- Crystal 54 - - -

- colored glass ... 54

- pure glass ... 54

- tin and lead. . 54

- Silver and Gold. 54

- Bronze! 54

- Iron and Steel. 54

136 142 147

158 169

183 70

75

(2nd edition, issued February 16, 1914

The masses are powdered and then in a bowl with cold water to one put on liquid porridge. This mixture behaves like plastered plaster, i. H. she sets quickly. The mass, can be used for all possible models, be they hard or soft, made of metal or clay, wax and the like, and also for molding natural objects how to use plants and the like, and

ίο gives the finest impressions very precisely again.

The relatively considerable gypsum content creates the possibility of making any desired models directly, while the pozzolana gives the mass the valuable property of being sufficiently refractory so that it can be heated to the high temperature already mentioned before casting, without to lose their mechanical connection and only disintegrates after the second heating caused by the casting. _;

For the casting of metal it is shaped in the following way, whereby the hard model is greased, the soft, however, is not greased. After the cast and trachea after the ordinary wax casting methods are appropriate, the above-mentioned mixture is in a or several layers. You can now let the shape become hard and you can use it then detach from the hard model, or you pull, provided you have elastic models used this out of the mold.

After the shape thus obtained has dried in the air, it will be left in the air overnight Fired heating chamber so that the plaster of paris becomes loose and porous. After it has cooled down the mold is fixed in the casting frame with sand and the casting is carried out in the usual way.

For the production of glass objects, the models are at their elevated points with Pins are studded, then the shape is exactly the same as for metal objects made, but omitted the cast and trachea; then the needles are pulled out and into the hole which they left on the surface of the mold using soft thin strings With the help of plaster of paris attached so that their ends protrude over the open edge of the form. The purpose of these strings is to make the mold porous so that the gases that the liquid glass evolves in them can easily can escape. After the shapes created in this way have solidified, they are peeled off or the soft model is taken from them and then placed in a sheet metal capsule attached to the mixture.

Care must be taken that external coincidences do not result in later occurrences Trachea can be damaged. The whole thing is then dried in the air and burned in the heating chamber, so that the plaster of paris becomes loose and porous and all the strings burn. Still glowing dark, the form is taken out and waited for until all of their hollows have turned gray again. The glass is then blown or pressed in in a known manner, depending on whether hollow or solid glass is to be produced.

After the mold has gone through the cooling furnace with the glass it contains it has become so crumbly and brittle that it almost falls off the glass by itself and only needs to be helped with light brushing. This also removes any impurities that form left about aiii glasses, easily removed. You can also rinse the form with water.

Claims (1)

Patent claim: Molding compound for casting molds for metal and glass, consisting of plaster of paris and pozzolana.