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US 4,378,044 AGranted
Process of forming casting mold for cast pieces having at least one undercut
AssigneeGoetze AG
InventorGunther Suchan
Life of this patent
Estimating the term…
Abstract
A mold forming tool for use in the manufacture of casting molds by compression of loose mold forming material by a process in which the final compacting is achieved by pressing, for the casting of cast pieces having undercuts, the tool having an elastically deformable portion in the region of the undercuts, and the elastically deformable portion being made of a material which is deformable, thus creating the undercut pattern, solely under the influence of the pressure exerted on the mold forming material during the final compacting.
Claims4
A process for the manufacture of a casting mold for cast pieces having at least one undercut, comprising:
- (a) embedding in a mass of loose mold forming material a tool having an elastically deformable portion in the region of such undercut, which portion does not present the shape of an undercut portion when unstressed by the mold material and is constructed to be deformed to create an undercut portion in the mold material when stressed by the mold material, the elastically deformable portion being made of a material which is deformable solely under the influence of pressure exerted on the mold forming material during compacting;
- (b) applying pressure for simultaneously deforming said elastically deformable portion of said tool to cause that portion to present the shape of the undercut and compacting said mold forming material to form the mold;
- and
- (c) removing said tool from the resulting mold, thus creating a mold recess in the shape of said tool when said elastically deformable portion is in its deformed state.
1 more element
Dependencies are inferred from the claim text.