Casting unit and casting method

Abstract

The casting unit solves problems of a conventional casting unit, in which a non-consumable sprue is connected to a lost foam gate attached to a core, such as troublesome assembly and post-treatment after casting. In the casting unit, a plurality of cores having molten metal inlets, which open into the surfaces of the cores and through which a molten metal is caused to flow into cavities formed in the cores, and a lost foam pattern, which forms a sprue between each of the molten metal inlets and a sprue cup, in which a molten metal is poured, and which has a peripheral surface coated with a refractory mold coating agent, are embedded in dry sand except for the sprue cup, and the cores, which are adjacent to each other, are connected to each other so that the plurality of cores are integrated.

Description

FIELD OF TECHNOLOGY[0001]The present invention relates to a casting unit and a casting method.BACKGROUND OF TECHNOLOGY[0002]A conventional casting method in which a lost foam pattern composed of resin, e.g., styrene foam, is used is known.[0003]In the above described conventional method, a casting unit shown in FIG. 17 is used. In the casting unit shown in FIG. 17, dry sand 106 is stored in a metal flask 100, and a lost foam pattern, which is composed of resin, e.g., styrene foam, and which includes product sections 102 and a sprue section 104, is embedded the dry sand, except for a sprue cup 108, which is provided to an upper end of the sprue section 104.[0004]A tubular member 110 having a plurality of through-holes 110a, 110a, . . . , whose diameter is smaller than a grain diameter of the dry sand 106, is inserted in the dry sand 106 so as to collect and discharge a decomposition gas, which is generated by contact between the lost foam pattern and the molten metal.[0005]In the con...

AI Technical Summary

Benefits of technology

[0015]In the casting unit shown in FIG. 18, transferring vestiges of the resin grains onto a surface of a cast product can be prevented. Further, the lost foam pattern is small, so leaving a part of the lost foam pattern and generating soot can be prevented.

[0031]After casting, the cast products, which are formed by filling the cavities with the molten metal, and the runners, which are formed by filling the sprue with the molten metal, are integrated as one cast body. Therefore, the cast body can be easily pulled out from the dry sand.

Problems solved by technology

However, an ordinary lost foam pattern is produced by molding grains of resin, e.g., styrene foam, so vestiges of the grains are formed on a surface of the lost foam pattern.

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