Method of making molds

Details Method of making molds Method of making molds

1979-05-29

1980-08-19

Baldwin, Robert D.

Metal founding

Process

Shaping a forming surface

164 33, 164 41, B22D 912

Patent

active

042179467

ABSTRACT:
A method of making molds, wherein facing sand prepared by using a binder which will retain its plasticity for a long time is spread into a thin sheet, which is then cut into suitable pieces according to the shape of a pattern, which pieces are then placed on the surface of the pattern or applied thereto while being connected together, thereby forming a layer of facing sand of uniform thickness, whereupon backing sand is charged to fill the cavity and rammed around, thereby making a mold. This method is effective to reduce the amount of facing sand used, improve the dissipation of gases and heat and uniform the pressure-resisting strength in the various portions, thereby eliminating various casting defects.

REFERENCES:
patent: 2903761 (1959-09-01), Sirmay
patent: 3391726 (1968-07-01), Edstrom
patent: 3438424 (1969-04-01), North

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