Casting apparatus and casting method of cylinder head
First Claim
1. A casting apparatus of a cylinder head, which comprises a pair of upper and lower molds that are separably joined to each other and which cast-molds a cylinder head of an engine by injecting molten metal into a casting mold cavity formed between the two molds so as to fill it with the molten metal to be solidified, through a gate formed in the lower mold, whereina plurality of core protrusions corresponding to holes are formed on the upper mold with cooling means being attached to each of the core protrusions, the cooling means attached to inner core protrusions comparatively closer to the center of the mold being designed so as to have a greater cooling capability than those attached to outer core protrusions comparatively closer to the periphery of the mold.
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Accused Products
Abstract
To obtain a high-quality cast product of a cylinder head, a proper directivity to the cooling process of the molten metal after a pouring process by utilizing the shape of a cylinder head is discussed. In a process where molten metal is injected to a casting mold cavity formed between upper and lower molds to fill it therewith so that the molten metal is solidified to form a cylinder head of an engine, a plurality of core protrusions corresponding to holes (plug holes and bolt holes) are formed in the upper mold, and a cooling means is attached to each of the core protrusions. With respect to cooling means attached to the plurality of core protrusions, those attached to the inner core protrusions comparatively closer to the center of the casting mold are designed so as to have a greater cooling capability than those attached to the outer core protrusions; therefore, with respect to the center portion and the outer portion of the casting mold cavity.
13 Citations
15 Claims
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1. A casting apparatus of a cylinder head, which comprises a pair of upper and lower molds that are separably joined to each other and which cast-molds a cylinder head of an engine by injecting molten metal into a casting mold cavity formed between the two molds so as to fill it with the molten metal to be solidified, through a gate formed in the lower mold, wherein
a plurality of core protrusions corresponding to holes are formed on the upper mold with cooling means being attached to each of the core protrusions, the cooling means attached to inner core protrusions comparatively closer to the center of the mold being designed so as to have a greater cooling capability than those attached to outer core protrusions comparatively closer to the periphery of the mold.
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9. A casting apparatus of a cylinder head, which comprises a pair of upper and lower molds that are separably joined to each other and side walls, and which cast-molds a cylinder head of an engine by injecting molten metal into a casting mold cavity formed by the two molds and the side walls so as to fill it with the molten metal to be solidified, through a gate formed in the lower mold, wherein
a plurality of core protrusions corresponding to holes are formed on the upper mold with cooling means being attached to each of the core protrusions, the cooling means attached to inner core protrusions comparatively closer to the center of the mold being designed so as to have a greater cooling capability than those attached to outer core protrusions comparatively closer to the periphery of the mold, and in that a spot cooling means, which restricts thermal conduction so as not to be exerted in any direction other than a specific direction, is installed in the-lower mold.
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10. A casting method for a cylinder head, which comprises the steps of preparing a pair of upper and lower molds that are separably joined to each other and cast-molding a cylinder head of an engine by injecting molten metal into a casting mold cavity formed between the two molds so as to fill it with the molten metal to be solidified, through a gate formed in the lower mold, wherein
a plurality of core protrusions corresponding to holes are formed on the upper mold with cooling means being attached to each of the core protrusions, the cooling means attached to inner core protrusions comparatively closer to the center of the mold being designed so as to have a greater cooling capability than those attached to outer core protrusions comparatively closer to the periphery of the mold.
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15. A casting method for a cylinder head, which comprises the step of preparing a pair of upper and lower molds that are separably joined to each other and side walls, and which cast-molds a cylinder head of an engine by injecting molten metal into a casting mold cavity formed by the two molds and the side walls so as to fill it with the molten metal to be solidified, through a gate formed in the lower mold, wherein
a plurality of core protrusions corresponding to holes are formed on the upper mold with cooling means being attached to each of the core protrusions, the cooling means attached to inner core protrusions comparatively closer to the center of the mold being designed so as to have a greater cooling capability than those attached to outer core protrusions comparatively closer to the periphery of the mold, and in that a spot cooling means, which restricts thermal conduction so as not to be exerted in any direction other than a specific direction, is installed in the lower mold.
Specification