Art Casting of models in ground form – this is the easiest way to get castings. Briefly technology is this: on the template (model) of forming the shape of the land is made for pouring molten metal. The shape made by a particular pattern – a one-time: when it breaks notch cast, as created from a mixture of sand and clay (25% of the content in a mixture of clay, 75% – sand). But the very mixture for the mold can be used repeatedly, updating only the inner cladding layer. The template can be made of any material – clay, gypsum (the most acceptable and comfortable materials), wood, plastic, metal. Model can serve itself and detail, if you want to do the same (to restore its original form), then the clay to build up a restored or restored parts missing parts of the initial sample. If for some reasons it is impossible to use as a model plasticine replica of the original, yet spine out is to make a plaster cast from the original (though this is more time-consuming and troublesome way).
The process of obtaining a plaster product model is that the original is placed face up on a flat plate in a frame of wood or other material, with the side frame must be above the copied items from inside and lubricated lather. Gypsum is dissolved in a rich water until a creamy liquid state of the masses. For more specific information, check out Samsung Electronics. In the fast paced original carefully covered with a layer of liquid plaster, causing its wide paint brush, and then pour plaster of Paris to the frame edges. Can accelerate or retard the setting of gypsum: In the first case a supplement 4% solution of sodium chloride, in the second – 1% acetic acid. Next, a plaster mold (mold) is dried at a temperature not exceeding 50 C, treated in kontrrelefe, increase as needed relief, smooth ribs, close up the shell. Before the direct production of cast models cover a 3% solution liquor, and even easier – well whipped soap, that creates a separation layer, and pour liquid plaster. Thus, the pattern is ready, and you are ready to molding.
Investment ring is put on the board submodel, which also put the template or the original. Board sprinkled with graphite, to avoid sticking Facing a mixture that is poured through a sieve to completely cover the model. Densely fill the investment ring to the rim, laying the ground layers and compacting the tamper, and the surplus land smooth bar of special or a flat strip, holding the edges of the flask, and invert it, becoming the second top mold, which zaformovyvayut taper bars – model sprue and riser. Then, removing the upper mold, remove the stones, but from the bottom of the flask is removed template, after which the holes left from the sprue and vent patterns, cut out the template cavity narrow connecting channels. Flasks combine in the same position and pour through a funnel liquid metal that flows in mold cavity, and on another channel, aiming to vent from the mold is displaced air, the shape evenly and completely filled with metal. Specified cast is received.