Process for the compression of molding sand for casting molds

Details Process for the compression of molding sand for casting molds Process for the compression of molding sand for casting molds

1993-03-08

1994-09-20

Bradley, P. Austin

Metal founding

Process

Shaping a forming surface

164 37, B22C 1528

Patent

active

053480708

ABSTRACT:
The invention relates to a process for the compression of molding sand in casting molds having a pattern plate with a pattern arranged therein. The molding sand is introduced loosely into the molding space located above the pattern plate and is thereafter fluidized to a final pressure of 20 bar maximum by means of a compressed-air surge acting on the molding sand followed by compression, by mechanical pressing. The process of the present invention provides a smooth pressure surge which is subdivided into at least a two part gradient in its pressure-rise time curve, so that the first part of the pressure-rise gradient takes place from 0.3 to 18 bar/sec to a pressure P.sub.1 and the second part has an increased pressure-rise gradient which takes place from 18 to 95 bar/sec. to a pressure P.sub.2 where P.sub.1 <P.sub.2 .ltoreq.20 bar. Subsequently, the P.sub.2 pressure is reduced in an essentially controlled manner, with a pressure-reduction gradient of a minimum of 3 bar/sec., and the pressing operation is initiated during the controlled pressure reduction.

REFERENCES:
patent: 4415015 (1983-11-01), Zadera
patent: 4529026 (1985-07-01), Kobel et al.
patent: 4546810 (1985-10-01), Landolt
patent: 4598756 (1986-07-01), Fuchigami et al.
patent: 4617978 (1986-10-01), Damm
patent: 4619307 (1986-10-01), Muller et al.
patent: 4828007 (1989-05-01), Fischer et al.
patent: 4846253 (1989-07-01), Damm
patent: 4915159 (1990-04-01), Damm et al.
patent: 4921035 (1990-05-01), Leutwiler
patent: 5020582 (1991-06-01), Damm et al.
patent: 5161596 (1992-11-01), Fischer et al.

Affiliated with

Also associated with

Rating

Process for the compression of molding sand for casting molds does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the compression of molding sand for casting molds, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the compression of molding sand for casting molds will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2429008