Method of sand coremaking
AssigneeGeneral Motors Corporation
InventorsJune-Sang Siak, Gordon Alwin Tooley, Mei Cai, Richard Michael Schreck, William Thomas Whited
Life of this patent
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Abstract
A method for making sand particle foundry mold members. Sand particles are coated with an aqueous dispersion of a suitable binder material such as a gelatin gel. The moist gelatin coated particles are gravity fed into a pattern box for the mold member and subjected to multi-axis vibration to pack the sand in the pattern box. The moist sand is then heated with radio frequency energy to promote binder flow to the corners of the particles, and air flow is initiated to transport water from the mass of particles to harden the mass of particles into the mold member.
Claims14
A method of making a bonded, sand particle foundry mold member, said method comprising:
- introducing sand particles into the cavity of a mold box such that the impact of said particles on said cavity does not substantially exceed an impact due to gravity filling of said particles, said cavity defining the shape of said foundry mold member, said sand particles being coated with a liquid dispersed binder that is hardenable upon evaporation of said liquid, said mold box being formed of a material that is transparent to radio frequency electromagnetic radiation,
- vibrating said mold box to compact said particles in said cavity;
- heating said liquid in said cavity with radio frequency electromagnetic radiation;
- and during said heating
- flowing a gas through said particles in said cavity to transport heated liquid from said particles to harden said binder and bond said particles into said foundry mold member.
A method of making a gelatin bonded, sand particle foundry mold member, said method comprising:
- introducing sand particles into the cavity of a mold box such that the impact of said particles on said cavity does not substantially exceed an impact due to gravity filling of said particles, said cavity defining the shape of said foundry mold member, said sand particles being coated with a water dispersed gelatin binder, said mold box being formed of a material that is transparent to radio frequency electromagnetic radiation;
- vibrating said mold box to compact said particles in said cavity;
- heating said water in said cavity with radio frequency electromagnetic radiation;
- and during said heating
- flowing a gas through said particles in said cavity to transport heated water from said particles to harden said gelatin binder and bond said particles into said foundry mold member.
Dependencies are inferred from the claim text.