JPS626735A - Structure for removing inclusion in casting mold - Google Patents

Abstract

PURPOSE:To remove inclusions and to prevent the generation of a defect in a product by providing restricting parts consisting of plural flat slits to a sprue part having an inverted circular cone shape to form a pouring basin. CONSTITUTION:The plural flat slits 3 are disposed to the sprue part 1 having the inverted circular cone shape. The restricting part 2 is formed of such slits 3 and the remaining surfaces and the pouring basin 20 is constituted in the upper part of the restricting part 2. When the molten metal in poured from the part 1, the flow of a molten metal is restricted in the pouring basin 20 by the restricting part 2, by which the inflow of the inclusions from the slits 3 is prohibited. Therefor the clean molten metal flows through a runner 4 and a gate 5 and is poured into cavities 6. The inclusions are removed in the pouring basin part 20 and the flow of the molten metal is restricted by the above- mentioned method and therefore the deformation, etc. of the casting mold by the post flow are prevented. The generation of the defect in a casting is thus prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a structure for removing inclusions from a mold used in a shell-type sprue system.

[Conventional technology]

Conventionally, to remove inclusions from this type of mold, the sprue system is equipped with a strainer, a weir core, etc., and when hot water is poured into the mold, slag and fallen sand floating on the surface of the hot water enter the cavity. It was preventing the influx.

[Problem that the invention seeks to solve]

However, in the conventional mold inclusion removal structure described above, strainers, weir cores, etc. are separately manufactured and housed in the mold, so when producing a large number of molds,
There were problems such as being labor-intensive and casting without placing it in a mold.

The present invention solves these conventional problems, and aims to provide an excellent mold inclusion removal structure that can produce a cast product free of inclusion defects.

[Means for solving problems]

In order to achieve the above object, the present invention is a shell-type sprue system in which a constriction part consisting of a plurality of flat slits is provided in an inverted conical sprue part to form a tundish part. .

[Effect]

The present invention has the following effects due to the above configuration. In other words, when molten metal is injected into the cavity through the sprue system, a pool is formed in the constricted part of the sprue that is integrated with the mold, thereby preventing slag, sand, etc. from flowing into the cavity. be able to.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, 10 is a shell type, and 1 is a sprue provided approximately in the center of the upper part of the shell type, and has an inverted conical shape.

Reference numeral 2 denotes a constriction section provided in the middle of the sprue section 1, which has a plurality of flat slits 3 having relatively narrow gaps. FIG. 2 shows a plan view of the constriction part 2, in which the slit 3 and the remaining surface form the constriction part 2, and the upper part of the constriction part 2 constitutes a pool part 20. 1a is the bottom of the sprue part 1, 4 is a runner branched from the bottom part 1a, and is further connected to the cavity 6 via a weir 5, forming a sprue system 30 of the shell type 10.

In the above embodiment, when the molten metal is injected from the sprue 1, the flow of the molten metal is suppressed in the molten pool 20 by the throttle part 2, and the inflow of inclusions from the slit 3 is prevented, so that the molten metal continues to be clean. flows through the runner 4 and the weir 5 and is injected into the cavity 6.

In this way, according to the above-mentioned actual glue, the flow of the molten metal is suppressed by the molten metal pool 20, so that inclusions such as slag in the molten metal are removed and prevented from flowing into the cavity.

〔Effect of the invention〕

As is clear from the embodiments described above, in the present invention, inclusions such as slag in the molten metal are removed by the molten metal pool formed by the constricted part of the sprue, and are prevented from flowing into the cavity. Furthermore, since the flow of the molten metal from the sprue is suppressed at the constriction, it is possible to prevent defects caused by deformation of the mold caused by the wake. Furthermore, since a core is not used, the core work process can be omitted when making a large number of molds, and there is no need to place the core in the mold (which may cause work problems such as casting). Its effects are enormous, including the ability to prevent this from happening.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a structure for removing inclusions from a mold according to an embodiment of the present invention, and FIG. 2 is a plan view of a main part of a converging portion of the same structure. 1------One place mouth part 2------One throttle part 3------Slit 10------Shell type 20------One place pool part 30---One sprue system Applicant Kawasaki Heavy Industries, Ltd. Figure 1

Claims (1)

[Claims] A structure for removing inclusions from a mold, in a shell-type sprue system, characterized in that an inverted conical sprue part is provided with a constriction part consisting of a plurality of flat slits to serve as a pool part.