Hand molding

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The hand forms and art forms is a molding method in the foundry industry , in which using simple tools such as sand hook, pitching wedge or compressed air Stampfer of the molding material , for example, a binder -provided quartz sand to the abzuformende model around in the flask by hand is compressed. The job title is Former . In contrast to machine molding, the sprue, sprue bars, gates and feeders as well as their dimensions must be set according to the marking on the model, i.e. by hand , and possibly demolded. In the case of rotationally symmetrical cast parts and plastic molding materials, model costs can be reduced by using model templates: casting bells, ship propellers, discs, wheels and the like. Caseless hand molding of large castings takes place in mold pits, the so-called hearth casting.

Reasons for production in a hand molding shop can be, for example:

• small number of items (unique items, small or very small series)
• heavy castings up to 400,000 kg and their dimensions larger than 2000 mm
• Complicated castings that can not be produced or cannot be produced economically on molding systems.

Application examples: large casting of all materials; Casting of turbine impellers , the housing for transmission , plastics , other art objects