Die member for forming a lost foam pattern

Details Die member for forming a lost foam pattern Die member for forming a lost foam pattern

1988-06-03

1989-10-10

Seidel, Richard K.

Static molds

Forming helical or threaded product

249 63, 249145, 425DIG58, 164 45, 164246, 164342, B22C 702

Patent

active

048726370

ABSTRACT:
A die member for forming a foam pattern for casting a cylinder block in a lost foam casting process, the pattern having a cylindrical bore with an axis, and a helical transfer passage including a first portion permitting die member separation in a direction along the axis of the cylindrical bore and an undercut portion preventing one-piece die member separation in the direction along the axis of the cylindrical bore, the die member comprising a main portion forming at least a portion of the cylindrical bore and including a projection forming a first part of the first portion of the transfer passage, and a core carried by the main portion and movable relative to the main portion along a line in a plane substantially perpendicular to the axis of the cylindrical bore, the core being movable between an extended position in which the core forms a second part of the first portion of the transfer passage and the undercut portion of the transfer passage, and a retracted position in which the core affords separation of the core through the second part of the first portion of the transfer passage and in common with separation of the projection from the first portion of the transfer passage in the direction along the axis of the cylindrical bore.

REFERENCES:
patent: Re31488 (1984-01-01), Trumbauer et al.
patent: 4092958 (1978-06-01), Hale
patent: 4129103 (1978-12-01), Pichl
patent: 4243093 (1981-01-01), Nieman
patent: 4632169 (1986-12-01), Osborn
patent: 4640333 (1987-03-01), Martin et al.
patent: 4657063 (1987-04-01), Morris
patent: 4691754 (1987-09-01), Trumbauer
patent: 4721149 (1988-01-01), Hesterberg et al.

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