JPH0284231A - Structure for taking out core for mold - Google Patents

Abstract

PURPOSE:To eliminate phenomena of sand inclusion, etc., and to prevent the development of defective casting by flowing molten metal into hook-like grooves at flange part of a core and separating from a mold under holding condition with the hook parts integratedly formed with the obtd. casting product. CONSTITUTION:The core 10 is formed to surface shape matching to the shape of an oil drop hole A1 and the flange 11 for latching at the time of inserting is formed in the base part thereof. In the flange 11, to a facing position at the facing end part, the hook-like grooves 11A in the side view are formed at the position equally dividing this area and the grooves are bent at the top parts. In the mold 12 for casting a cylinder head, runners connecting with the grooves 11A ia arranged. In a mold 13 facing to the mold 12, recessed part 13A for inserting the flange 11 is formed and circumferential wall has inclination for easyto-pull out. After completing casting, at the time of separating the mold 12, the flange 11 is held up with the hook part 11B. By this method, falling-down of the flange is prevented and the phenomena of the sand inclusion, etc., can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a structure for taking out a mold core, and more particularly 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 holes in the casting product, a core is embedded in the hole corresponding to the hole position when the product is inserted into the mold. It will be done.

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

That is, since the oil drop hole A1 described above is designed to function as a recirculation path for exhaust gas as well as oil, a bulge forming a reservoir is formed in order to improve the fluidity of exhaust gas. has been done.

Therefore, the core B loaded into the mold to form this oil drop hole A1 is as shown in FIG.
The flange part B1 for locking the core located on the lower mold side has a surface shape with a continuous bulge. It is demolded and removed together with the flange portion B1 by, for example, air blowing.

(Problem to be Solved by the Invention) By the way, in the above-mentioned core, when the upper mold on the cylinder head A side is separated from the lower mold after casting, the adhesiveness generated during pouring may cause the lower mold to If the flange part of the core falls off into the recess that is formed to accommodate the core, or if it scatters when it falls off,
Sand may remain attached to or around the recesses, and it is necessary to remove this residual sand as a post-process.

However, in order to remove this residual sand, it depends on the installation position of the oil drop hole in the cylinder head, for example, as shown in FIG. 7.

If the oil drop hole A1 is located in the longitudinal center of the cylinder head A, casting'! The position may be quite far from the end of position A, and if you try to operate the air blow nozzle manually, it may be difficult to visually check the air blow nozzle at that position, and as a result, it may not be possible to completely remove the remaining sand.

Therefore, if there is residual sand in this way, during the next casting process, a phenomenon in which sand gets mixed in and adheres to the surface of the cylinder head, which is the joint surface with the cylinder block, will occur, causing the casting product to be defective. becomes.

In view of the above-mentioned problems with molds containing cores, an object of the present invention is to make it possible to separate the core from the non-displaced mold while retaining its complete shape together with the displaceable mold when the mold is separated. The purpose is to obtain a take-out structure.

(Means for Solving the Problems) In order to achieve this object, the present invention provides a mold for forming a casting hole by loading a core having a locking flange, in which the area of the flange is A hook-shaped groove that bends toward the horizontal plane of the flange head when viewed from the side of the flange is formed at a position where the flange is evenly distributed, and a part of the core other than the flange part is located where the runner connecting to this groove is located. The flange portion is formed on one side of the one mold through a hook formed integrally with the cast product obtained by the one mold by pouring molten metal into the hook-shaped groove. This is a proposal to make it possible to separate from the other type by holding it in your arms.

(for production) According to the invention, at the flange head of the core.

A hook part integral with the cast product obtained by the mold corresponds to the mold, and when the mold is pulled up, the flange part of the core is lifted together with the mold via the hook part.

(Embodiment) Hereinafter, details of an embodiment of the present invention will be explained with reference to FIGS. 1 to 4. In addition, in FIGS. 1 to 4, structural parts that are the same as those shown in the drawings from FIG. 5 onward are indicated by the same reference numerals.

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

That is, the core 10 has a surface shape that matches the shape of the oil drop hole A1 shown in FIG. 5, and a flange 11 for locking when loaded is formed at the base of the core 10. .

As shown in FIG. 1, in the above-mentioned flange 11, grooves 11A are formed at opposite positions of the opposite ends to form a hook shape in a side view so that the area of the head of the flange 11 can be evenly distributed. This groove 11A is bent at the head of the flange 11, as shown in the second figure.

On the other hand, a mold 1 is loaded with such a core 10 and corresponds to the side where a runner for casting a cylinder head is formed.
2 (referred to as one type for convenience).

As shown in FIG. 3, in addition to the runner for forming the wall of the cylinder head A, there is also a runner (not shown) that communicates with the groove 11A in the flange 11 of the core 10, for example. It was partially extended.

Further, one mold 12 is separated from the other mold 13, which will be described later, when the casting is completed, and at the time of this separation, the core 10 is also separated from the other mold 13. It has become.

The other mold 13 described above has a recess 13 that can accommodate the flange 11 of the core 10 at a position corresponding to the flange 11.
A is formed, and this recess 13A is formed in the flange 11.
To facilitate removal when disconnecting.

The surrounding wall is a sloped surface.

Since this embodiment has the above structure, with the core 10 loaded in one mold 12 on the cylinder head side, this mold 12 and the other mold 13 are joined, and the molten metal is poured from a sprue (not shown). At this point in time when pouring and filling the mold with hot water, the hot water also spreads into the groove 11A in the flange 11 of the core 10, causing the hook portion 11B (see Fig. 4) to follow the shape of the groove 11A. ) is formed.

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, one mold 12 has a core 10 as shown in the fourth diagram.
The head of the flange 11 is held up by the hook portion 11B and lifted.

Therefore, the flange 11 on the core 10 is
3 is prevented from falling into the recess 13A, and as a result, it 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 flanges of the core are pulled apart while being held by the hooks formed integrally with the cast product, so the flanges are accommodated. This prevents the sand from falling onto the inner surface of the other mold, preventing sand from adhering to it, thereby preventing it from falling off the flange and leaving sand in or around the flange housing of the mold. It is possible to eliminate phenomena such as sand trapping and suppress the occurrence of defective casting products.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a core used in the 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. 3 is an overall view of the take-out structure according to an embodiment of the present invention. 4 is a model diagram for explaining the function of the take-out structure shown in FIG. 3, FIG. 5 is a sectional view showing an example of a cast product using a core, and FIG. 6 is a sectional view showing the structure. FIG. 5 is a side view showing a core applied to the casting product shown in FIG. 5, and FIG. 7 is a plan view of the casting product shown in FIG. 10... Core, 11... Flange part, IIA...
・Hook-shaped groove. 11B...Hook part, 12...One mold for accommodating the part of the core other than the flange part 513...The other mold forming the other party. Figure 1 Figure 2 Figure 3 Saw Figure 4 Figure 5 Figure 6

Claims (1)

[Scope of Claims] In a mold in which a core having a locking flange portion is loaded to form a casting hole, the flange portion is located at a position where the area is evenly distributed when viewed from the side of the flange. A hook-shaped groove that bends toward the horizontal plane of the head is formed, and a runner connecting to this groove is formed on one side of the mold where a portion other than the flange portion of the core is located, and a runner is formed in the hook-shaped groove. The above-mentioned flange part can be separated from the other mold which is the counterpart of the above-mentioned one mold by holding it through a hook part formed integrally with the cast product obtained by the above-mentioned one mold by pouring the molten metal. A mold core removal structure featuring: