JP2643360B2 - Take-out structure for mold core - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a structure for taking out a mold core,
The present invention relates to a structure for taking out a core having a flange portion.

(Prior Art) As is well known, in the production of castings, in order to form a hole in a casting product, a core is buried in a portion corresponding to the hole position at the time of molding. It is.

FIG. 5 is a side view sectional view of a cylinder head of an automobile engine which is an example of a cast product having the above-described hole. For example, in a cylinder head A cast by a split mold, the above-described core B is an engine. It is applied to the oil drop hole A1 which forms a part of the oil circulation path.

That is, since the oil drop hole A1 described above functions as a recirculation path of the exhaust gas together with the oil, a bulging portion forming a reservoir is formed for the purpose of improving the fluidity of the exhaust gas. Have been.

Therefore, the core B loaded in the mold to form the oil drop hole A1 is, as shown in FIG.
A surface shape having a continuous bulge is set on the core locking flange portion B1 located on the lower mold side, and after filling the molten metal, at the stage where the cylinder head A side is lifted upward in the figure. The mold is separated and removed together with the flange portion B1 by, for example, an air blow process.

(Problems to be Solved by the Invention) By the way, in the above-mentioned core, when the upper die on the cylinder head A side is separated from the lower die after casting, the lower die is formed by the binding property generated at the time of pouring. The flange portion of the core may fall off into the recess for accommodating the formed core, or may be scattered at the time of the fall, and sand may remain in the recess or around the recess while being attached. There is a need to remove the residual sand as a post-process.

However, to remove this residual sand, depending on the installation position of the oil drop hole in the cylinder head, for example, as shown in FIG. In such cases, the air blow nozzle may be located far away from the end of the casting machine, and if the air blow nozzle is operated by hand, it is difficult to visually recognize the position, and as a result, the residual sand is completely removed. May not be possible.

Therefore, if there is such residual sand, a phenomenon in which sand is mixed and adhered to the cylinder head surface, which is a joining surface with the cylinder block, at the time of the next casting, a so-called sand biting phenomenon occurs, and the casting product is defective. Become.

Therefore, an object of the present invention is to solve the above-described problem in the mold including the core, and at the time of separating the mold, the core can be separated from the mold that does not displace in a state where the mold is completely displaced together with the mold that displaces. The object is to obtain a take-out structure.

(Means for Solving the Problems) In order to achieve this object, the present invention relates to a mold for forming a hole in a casting by loading a core having a flange portion for locking, wherein the area of the flange is In a position where the flanges are evenly distributed, a hook-shaped groove that bends toward the horizontal plane of the flange head in a side view of the flange is formed, and a portion other than the flange portion of the core is located at a runway that communicates with the groove. Formed on one mold side, the flange portion through the hook portion formed integrally with the cast product obtained by the one mold by pouring the molten metal into the hook-shaped groove, It proposes to be able to pull away from the other mold that is the other party while holding it.

(Operation) According to the present invention, the hook portion integral with the casting product obtained by the mold corresponds to the flange head of the core, and when the mold is pulled up, the flange portion of the core is formed via the hook portion. It will be lifted with the mold.

(Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. It should be noted that in FIGS.
For the same structural parts as those shown in the drawings after the figure,
They are indicated by the same reference numerals.

FIG. 1 is a perspective view showing a core used in a take-out structure according to an embodiment of the present invention.

That is, the core 10 is set to have a surface shape corresponding to the shape of the oil drop hole A1 shown in FIG. 5, and a flange 11 for locking when the core 10 is loaded is formed at the base thereof. .

As shown in FIG. 1, the above-mentioned flange 11 has a hook-shaped groove in a side view in a state where the area of the head of the flange 11 can be evenly distributed at opposing positions of opposing ends.
11A is formed, and the groove 11A is formed as shown in FIG.
The flange 11 is bent at the head.

On the other hand, a mold 12 loaded with such a core 10 and corresponding to a side on which a runner for casting a cylinder head is formed.
As shown in FIG. 3, in addition to a hot water path for forming the wall of the cylinder head A, a hot water communicating with the groove 11A in the flange 11 of the core 10 as shown in FIG. A path (not shown) is provided, for example, extending from a part of the wall.

Also, one mold 12 is designed to be separated from the other mold 13 described below at the time of completion of casting, and at the time of this separation, the core 10 is also separated from the other mold 13 together. Has become.

In the other mold 13 described above, a concave portion 13A capable of accommodating the flange 11 is formed at a position corresponding to the flange 11 of the core 10, and the concave portion 13A easily removes the flange 11 at the time of separation. For this purpose, the peripheral wall is formed as a sloping surface.

Since the present embodiment has the above-described structure, the core 10 is loaded in one of the dies 12 on the cylinder head side,
The mold 12 and the other mold 13 are joined, and molten metal is poured from a gate (not shown) to fill the mold with hot water. At this point, the core
Hot water also spreads in the groove 11A in the flange 11 of the ten, thereby forming a hook 11B (see FIG. 4) along the shape of the groove 11A.

On the other hand, when the casting operation is completed, one mold 12 on the cylinder head side is separated from the other mold 13. At this time, as shown in FIG. 4, the one mold 12 is lifted while the head of the flange 11 of the core 10 is held by the hook 11B.

Therefore, the flange 11 of the core 10 is prevented from falling into the recess 13A of the other mold 13, and as a result, is lifted together with the cylinder head without sticking to the recess 13A.

(Effects) As described above, according to the present invention, when the mold is separated, the flange of the core is pulled away while being held by the hooks formed integrally with the casting product. It is possible to prevent the situation of falling off on the inner surface of the mold of the other party and prevent the adhesion of sand, so that it does not fall off from the flange and the sand remains in the flange housing part of the mold or its surroundings, The occurrence of defective castings can be suppressed by eliminating phenomena such as sanding.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a core used in a take-out structure according to an embodiment of the present invention, FIG. 2 is a side view of the core shown in FIG. 1, and FIG. FIG. 4 is a cross-sectional view showing the structure, FIG. 4 is a model view for explaining the operation of the take-out structure shown in FIG. 3, FIG. 5 is a cross-sectional view showing an example of a cast product using a core, and FIG. FIG. 7 is a side view showing a core applied to the casting shown in FIG. 5, and FIG. 7 is a plan view of the casting shown in FIG. 10… Core, 11… Flange, 11A… Hook-shaped groove, 11B
... Hook, 12 ... One type to accommodate the core outside the flange portion, 13 ... The other type that forms the other side.

Claims (1)

(57) [Claims] 1. A mold in which a core having a locking flange portion is loaded to form a hole in a casting, wherein a flange head is provided at a position where the area of the flange portion is evenly distributed in a side view of the flange. A hook-shaped groove that bends toward the horizontal plane of the portion is formed, and a runner channel that communicates with the groove is formed on one mold side where a portion other than the flange portion of the core is located, and the molten metal is formed in the hook-shaped groove. The flange portion can be separated from the other mold which is the counterpart of the one mold by pulling the flange portion through the hook formed integrally with the cast product obtained by the one mold. A feature for taking out the mold core.