Core molding apparatus and core molding method
AssigneeToyota Jidosha Kabushiki Kaisha
InventorTakehisa Fujisawa
Life of this patent
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Abstract
A core molding apparatus and a core molding method capable of reducing the possibility of the deterioration in the calculation accuracy of the amount of supply of a raw material for a core are provided. A core molding apparatus includes: a kneading tank configured to knead a raw material for a core; a raw material supply unit configured to supply the raw material to the kneading tank; a mold configured to contain a kneaded material made of the raw material kneaded in the kneading tank and to mold the core; a piston configured to inject the kneaded material contained in the kneading tank into the mold; and a control unit configured to control an amount of supply of the raw material from the raw material supply unit to the kneading tank.
Claims1
A method for molding a core comprising:
- supplying a raw material that includes sand, water, water glass, and/or a liquid additive for the core to a kneading tank;
- kneading the raw material in the kneading tank;
- injecting a kneaded material made of the raw material kneaded in the kneading tank into a mold by a piston by making the kneaded material made of the raw material kneaded in the kneading tank pass through a through hole of an injection plate by the piston, and thereby molding the core by forming a molded article with a first portion of the kneaded material remaining in the kneading tank, a second portion of the kneaded material remaining in the through hole of the injection plate, and a third portion of the kneaded material remaining in an internal space of the mold;
- calculating an amount of a change in a total volume of the kneaded material in the kneading tank upon completion of the injection by ΔV =Vp+Vn−(Lpst−Lstd)×AT, in which
- ΔV is the amount of the change in the total volume of the kneaded material in the kneading tank upon completion of the injection,
- Vp is a volume of the through hole of the injection plate,
- Vn is a volume of the mold in which the kneaded material is contained,
- Lpst is a detected position of the piston upon completion of the injection,
- Lstd is a predetermined reference position of the piston upon completion of the injection based on a reference inner volume of the kneading tank, and
- AT is a cross-sectional area of the kneading tank;
- determining an amount of supply of the raw material by multiplying the amount of the change in the total volume by a density of a molded core measured in advance;
- opening the mold and removing the second portion of the molded article and the third portion of the molded article;
- and
- supplying the determined amount of supply of the raw material to the kneading tank with the first portion of the molded article in the kneading tank,
- wherein the density of the molded core measured in advance and that of the kneaded material before the injection are different.
Dependencies are inferred from the claim text.