Method of making metal casting mold, and mold

A metal casting mold comprising:

• a pulp-molded element covering a support pattern;
• a mold flask provided with a depressurizing device and installed on an upper side of the pulp-molded element;
• heat-resistant particles packed inside the mold flask;
• and
• a sealing member provided on an upper surface of the mold flask so as to seal the inside of the mold flask,
• wherein the depressurizing device is operable to depressurize the inside of the mold flask, thereby forming a mold comprising the mold flask, the heat-resistant particles, the pulp-molded element and the sealing member, and allowing the pulp-molded element to be separated from the support pattern.

A method of making a metal casting mold, comprising the steps of:

• forming a pulp-molded element by using a paper-making pattern mold having a screen provided on a surface thereof;
• installing a mold flask provided with a depressurizing device, on an upper side of the pulp-molded element;
• packing heat-resistant particles inside the mold flask;
• providing a sealing member on a back surface of the mold flask so as to seal the inside of the mold flask;
• depressurizing the inside of the mold flask by the depressurizing device, to form a mold comprising the mold flask, the heat-resistant particles, the pulp-molded element and the sealing member;
• and
• separating the pulp-molded element from the paper-making pattern mold.

A method of making a metal casting mold, comprising the steps of:

• forming a pulp-molded element by using a paper-making pattern mold having a screen provided on a surface thereof;
• transferring the pulp-molded element to a support pattern;
• installing a mold flask provided with a depressurizing device, on an upper side of the pulp-molded element;
• packing heat-resistant particles inside the mold flask;
• providing a sealing member on a back surface of the mold flask so as to seal the inside of the mold flask;
• depressurizing the inside of the mold flask by the depressurizing device, to form a mold comprising the mold flask, the heat-resistant particles, the pulp-molded element and the sealing member;
• and
• separating the pulp-molded element from the support pattern.

A method of making a metal casting mold, comprising the steps of:

• forming a pulp-molded element having a core shape with at least one opening, by a combinational paper-making pattern mold having a molding surface divided into a plurality of regions and covered by a screen;
• inserting a depressurizing device from the opening into the pulp-molded element, and packing heat-resistant particles inside the pulp-molded element;
• sealing the opening of the pulp-molded element so as to prevent discharge of the heat-resistant particles packed inside the pulp-molded element;
• depressurizing the inside of the pulp-molded element by the depressurizing device, to form a core-shaped mold comprising the heat-resistant particles and the pulp-molded element;
• and
• separating the core mold having the pulp-molded element as a surface thereof, from the combinational paper-making pattern mold.