Sprue structure for low-pressure casting device and low-pressure casting device having said sprue
First Claim
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1. A sprue structure that is used for a low-pressure casting device to communicate a stalk with a cavity of a mold, the sprue structure comprising:
- a stalk connection part configured to be connected to the stalk of the low-pressure casting device;
a molten metal reservoir; and
a cavity connection part configured to be connected to the cavity,wherein a shape of the molten metal reservoir is such that the molten metal reservoir has a circular cross section at a connection to the stalk connection part and a non-circular cross section at a connection to the cavity connection part such that a perimeter of each cross section of the molten metal reservoir perpendicular to a flow direction of molten metal gradually changes from the circular cross section at the connection to the stalk connection part to the non-circular cross section at the connection to the cavity connection part while an area of each cross section remains constant.
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Abstract
A sprue for a low-pressure casting device includes a stalk connection part to be connected to a stalk, a molten metal reservoir and a cavity connection part to be connected to the cavity. The shape of the molten metal reservoir is such that the perimeter of the cross section perpendicular to the flow direction of molten metal gradually increases toward the cavity connection part while the area of the cross section remains constant.
5 Citations
9 Claims
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1. A sprue structure that is used for a low-pressure casting device to communicate a stalk with a cavity of a mold, the sprue structure comprising:
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a stalk connection part configured to be connected to the stalk of the low-pressure casting device; a molten metal reservoir; and a cavity connection part configured to be connected to the cavity, wherein a shape of the molten metal reservoir is such that the molten metal reservoir has a circular cross section at a connection to the stalk connection part and a non-circular cross section at a connection to the cavity connection part such that a perimeter of each cross section of the molten metal reservoir perpendicular to a flow direction of molten metal gradually changes from the circular cross section at the connection to the stalk connection part to the non-circular cross section at the connection to the cavity connection part while an area of each cross section remains constant. - View Dependent Claims (2, 3)
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4. A low-pressure casting device, comprising:
- a holding furnace configured to hold molten metal;
a stalk with a lower end configured to be dipped in the molten metal in the holding furnace;
a sprue communicating the stalk to a cavity of a mold; and
a pressure controller configured to control a pressure in the holding furnace,wherein the sprue comprises; a stalk connection part configured to be connected to the stalk; a molten metal reservoir; and a cavity connection part configured to be connected to the cavity, and the shape of the molten metal reservoir is such that the molten metal reservoir has a circular cross section at a connection to the stalk connection part and a non-circular cross section at a connection to the cavity connection part such that a perimeter of each cross section of the molten metal reservoir perpendicular to a flow direction of the molten metal gradually changes from the circular cross section at the connection to the stalk to the non-circular cross section at the connection to the cavity connection part while an area of each cross section remains constant. - View Dependent Claims (5, 6, 7, 8, 9)
- a holding furnace configured to hold molten metal;
Specification