JPH0593640U - Gate structure of casting mold equipment - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] The present invention relates to a casting mold apparatus having an overflow groove in a sprue cup, and relates to a sprue structure for improving the breakage of overflowed molten metal. [Structure] On the lower surface of the overflow groove 14 of the sprue cup 3 connecting the inside and outside of the sprue, a top portion t having a high middle portion of the groove path is provided, and an inclined surface m descending from the top portion t toward the inside of the sprue. The mountain-shaped portion 14a formed of the inclined surface n descending toward the outside is provided to improve the drainability.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a casting mold apparatus having a sprue cup having an overflow groove, and more particularly to a sprue structure for improving cutting of an overflowed molten metal.

[0002]

[Prior Art]

 Conventionally, a structure of a sprue cup as shown in FIGS. 4 and 5 is known in a casting mold apparatus. That is, the sprue cup 51 provided on the split surface of a mold (not shown) that can be clamped and opened is made up of a pair of sprue cup divided bodies 52 and 53 provided in each pair of molds. Semi-conical groove portions 54, 55 are provided on the mating surfaces 52a, 53a side, the upper portions of which expand. In addition, a funnel-shaped receiving port is formed in the mold clamped state so that the molten metal to be poured can be quietly and quickly poured without disturbing it. Further, an overflow groove 56 is provided on the upper surface of the cup divided body 52 on one side to keep the pouring amount constant, and serves as an escape area for the molten metal that exceeds a predetermined amount when pouring.

[0003]

[Problems to be solved by the device]

 However, in the conventional case, since the overflow groove 56 as described above is merely a straight groove, there is a problem that the molten metal is likely to remain in the flat portion 56a on the lower surface of the groove. The remaining molten metal adversely affects the corners and the like of the cup divided body 52 and causes cracks and the like.

[0004]

[Means for Solving the Problems]

 In order to solve such a problem, the present invention forms a chevron portion on the lower surface of the overflow groove, which has descending inclined surfaces toward the inside and outside of the sprue.

[0005]

[Action]

 The shape of the mountain improves the removal of molten metal, and no molten metal remains in the overflow groove.

[0006]

【Example】

 An embodiment of a gate structure of the present invention will be described with reference to the accompanying drawings. 1 is an explanatory view showing a mating surface of a mold device, FIG. 2 is a perspective view of a sprue cup, and FIG. 3 is a sectional view of an overflow groove portion of FIG.

[0007] For example, the manufacture of crankshafts, which are engine components of automobiles, is cast by a mold apparatus as shown in FIG.

That is, the mold 1 is configured as a vertical casting horizontal casting machine in which, for example, the mating surface is a vertical surface, the mold is opened in the lateral direction, and the mold is clamped, and the molten metal is poured from the pouring pot 2. The runner 4 communicates with the sprue cup 3 to be touched. A cavity 6 for forming a camshaft is in communication with the runner 4 via a gate 5.

The sprue cup 3 is composed of a pair of cup divided bodies 7 and 8 provided in each mold, and the present invention is characterized by the structure of the sprue cup 3 of the pouring section. Is.

As shown in FIG. 2, the cup divided bodies 7 and 8 have mold-matching surfaces 7a and 8a on the sides facing each other, and semi-conical groove portions 10 and 11 are formed on the mold-matching surfaces 7a and 8a, respectively. Vertical groove portions 12, 13 communicating with the lower end portions of these semi-conical groove portions 10, 11 are provided.

The grooves 10, 11, 12, and 13 of the cup divided bodies 7 and 8 form a funnel-shaped receiving opening in a mold-matched state and communicate with the runner 4.

An overflow groove 14 is provided in the cup divided body 7 on one side.

The overflow groove 14 is provided to allow the excess molten metal to escape when the poured molten metal exceeds a predetermined amount. The overflow groove 14 is formed on the upper surface of the cup division body 7 so that the inside and outside of the sprue communicate with each other. It is provided as a groove in a book.

By the way, a mountain-shaped portion 14a is provided on the lower surface of the overflow groove 14.

In the chevron portion 14a, an intermediate portion of the overflow groove 14 connecting the inside and outside of the sprue becomes a top portion t, which becomes higher, and as shown in FIG. 3, it extends from the top portion t toward the inner side. It has an inclined surface m that becomes lower and an inclined surface n that becomes lower toward the outside.

The inner inclined groove m communicates with the inside of the sprue through the semi-conical groove portion 10, and the outer inclined surface n communicates with a discharge passage (not shown).

The inclination angles of the inclined surfaces m and n and the position of the central top t are arbitrary.

In such a sprue structure, the melt is poured into the sprue of the sprue cup 3 in the mold clamped state, and is filled in the cavity 6 and the runner 4. Then, the molten metal that exceeds the predetermined amount flows out to the external discharge path through the overflow groove 14 of the cup division body 7.

At this time, with the top t of the lower surface of the overflow groove 14 as a boundary, the molten metal flows down toward the inner side and the outer side of the sprue to improve the drainability, and the molten metal remains on the lower surface of the overflow groove 14. There is no such thing.

[0020]

[Effect of the device]

 As described above, in the sprue structure of the casting mold device of the present invention, the middle portion of the overflow groove is raised, and the descending inclined surfaces are provided toward the inside and outside of the sprue, respectively. The situation in which the molten metal is improved and the molten metal remains in the groove does not occur. Therefore, there is an effect that the durability of the mold can be enhanced.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a mold matching surface of a mold device.

FIG. 2 is a perspective view of a sprue cup.

FIG. 3 is a sectional view of an overflow groove portion.

FIG. 4 is a perspective view of a conventional sprue cup.

FIG. 5 is a sectional view of a conventional overflow groove portion.

[Explanation of symbols]

 1 die 3 sprue cup 7 and 8 cup divided body 14 overflow groove 14a chevron portion

Claims (1)

[Scope of utility model registration request] 1. A casting mold apparatus characterized in that a mountain-shaped portion is formed on a lower surface of an overflow groove communicating with the inside of the sprue cup so that descending inclined surfaces are formed toward the inside and outside of the sprue cup, respectively. The gate structure.