JPH0140609Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a mold for forming an intake manifold core, and in particular, to a baseboard for preventing the core from falling (floating or sinking) during intake manifold casting. It takes a mold for forming an intake manifold core.

[Conventional technology]

The intake manifold is a passage for distributing the mixture of fuel and air from the carburetor to each cylinder of the engine. For example, in the case of a 4-cylinder engine, the intake manifold splits into left and right from the carburetor mounting area where the carburetor hole is located. It has four port branch pipes that split into left and right branches at the tip. The carburetor hole is drilled in a circular or oval shape at the carburetor attachment part of the intake manifold.

Conventionally, the common method for manufacturing intake manifolds has been to manufacture them by casting, and as disclosed in Japanese Utility Model Application Publication No. 57-65746, an intake manifold core is placed in a casting mold, and the intake manifold core is placed in a casting mold. Casting is performed by filling the space between the mold and the intake manifold core, that is, the cavity, with molten metal.

The core for casting intake manifold products is generally made by installing a carburetor hole baseboard using the carburetor hole and the port of the intake manifold in order to mount the intake manifold core in a predetermined position with respect to the casting mold. A baseboard is formed on the intake manifold core.

However, with the intake manifold core, the port baseboard can be inserted between the casting molds, but the carburetor hole baseboard is only attached to one casting mold, and the carburetor hole baseboard can be inserted into the left and right or top and bottom casting molds. It was not possible to create a configuration in which it was inserted into a mold. Therefore, if an intake manifold core without a core baseboard (carburetor hole baseboard) that is inserted into the left and right or top and bottom casting molds is installed in the casting mold, the retention of the intake manifold core against the casting mold will become unstable. , due to the intake manifold core falling down (lifting, sinking), the intake manifold core may shift from its installation position, resulting in casting defects such as variations in the thickness of the cast product and poor hot water circulation. Ta.

In response to the need for a core that overcomes these conventional drawbacks, an intake manifold core was devised in which a baseboard to prevent the core from falling was provided through a carburetor hole baseboard. The intake manifold core having this baseboard to prevent the core from collapsing will be explained with reference to FIG. The intake manifold core 4 has a plurality of port cores and has two carburetor hole baseboards 6 on the right side of the intake manifold core 4 shown by the solid line in the figure, and has a carburetor hole width. One side of the tree 6 has a core fall prevention baseboard 5 extending parallel to the intake manifold core 4 and upward in the figure.

The intake manifold core 4 having the core fall prevention baseboard 5 was molded using a core molding die as shown in FIG.

Since the core molding mold integrally molds the core fall prevention baseboard 5 with the carburetor hole baseboard 6, the right mold 1, the left mold 2, and the left and right molds 1 and 2 alone have no draft angle. The core was formed using a three-part molding mold in which an insert 3 was inserted between the right mold 1 and the left mold 2 in the area that could not be removed.

[The problem that the idea aims to solve]

According to the conventional core molding mold, in order to take out the intake manifold core 4 after molding, after opening the left and right molds 1 and 2 to the left and right, the insert 3 is moved upward from the mold using a cylinder or the like. The disadvantage is that the core must be pulled out, which complicates the core molding process.

In order to solve the above problems, the present invention is an intake manifold core molding tool that can mold an intake manifold core without core collapse (lifting, sinking) during casting using a molding mold that is divided into left and right or top and bottom. Provide the type.

[Means to solve the problem]

Therefore, the mold for making an intake manifold core of the present invention is an intake manifold core in which a baseboard for preventing core fall that can be held in a casting mold is integrally formed via a carburetor hole baseboard, and In the intake manifold core molding mold in which the intake manifold core is molded by a molding mold divided into left and right or top and bottom, the baseboard for preventing the core from collapsing in the mold opening direction of the molding mold is formed. A mold for forming an intake manifold core has a shape that matches the circumferential edge of the carburetor hole baseboard and the circumferential edge of the intake manifold core on which the carburetor hole baseboard is formed, and the carburetor hole baseboard and the intake manifold A draft having a shape that matches the shape of the periphery in the mold opening direction of the mold is provided in a portion of the molding mold that faces the shape of the periphery of the mold, and the intake manifold core is divided into left and right or top and bottom halves. The present invention is characterized in that it is configured to be able to be molded using the molding die described above.

[Effect]

According to the intake manifold core molding mold of the present invention described above, the carburetor hole baseboard is formed with the periphery of the carburetor hole baseboard where the core fall prevention baseboard is formed in the mold opening direction of the mold. A mold for forming the intake manifold core has a shape that matches the peripheral edge of the intake manifold core, and a mold is placed in the molding mold part that faces the shape of the peripheral edge of the carburetor hole baseboard and the intake manifold core. A draft angle having a shape that matches the shape of the peripheral edge in the mold opening direction is provided.

Therefore, the intake manifold core has a baseboard that prevents the core from falling, which can be held in the casting mold.
The mold can be molded using a mold that is divided into left and right or upper and lower halves without using a nest.

〔Example〕

Embodiments of the present invention will be described below based on the accompanying drawings.

In this embodiment, the same or equivalent parts as in the conventional example shown in FIG. 1 are given the same reference numerals as in FIG. 1, and the explanation thereof will be omitted.

FIG. 2 shows a mold for forming an intake manifold core according to the present invention.

The mold is a mold that is divided into left and right halves, and is used to integrally mold the intake manifold core 4 with the core fall prevention baseboard 5 interposed through the carburetor hole baseboard 6.

Specifically, the peripheral edge 11 of the carburetor hole baseboard 6 where the core fall prevention baseboard 5 is formed in the mold opening direction of the molding molds 1 and 2, and the intake manifold core 4 where the carburetor hole baseboard 6 is formed. The intake manifold core 4 has a shape that matches the peripheral edge 12 of the carburetor hole baseboard 6 and the intake manifold core 4.
In, the periphery 11,1 of the molding die in the mold opening direction
A draft angle with a shape matching that of 2 is provided. 7 shows the shape of the carburetor hole notch. For example, if the carburetor hole of the intake manifold casting is made circular, the carburetor hole baseboard 6 will be cut out corresponding to the circular shape of the carburetor hole.
The outer periphery of the carburetor hole baseboard 6 is also circular, but the periphery 11 of the carburetor hole baseboard 6 on the left side where the core fall prevention baseboard 5 in FIG.
The shape corresponds to the peripheral edge 12 of the intake manifold core 4 where the intake manifold core 4 is formed. Therefore, when the intake manifold core 4 is used for casting, the shape of the carburetor hole is partially cut out corresponding to the peripheral edge 11 of the carburetor hole baseboard 6.

Next, FIGS. 3a and 3b show a state in which the intake manifold core 4 is mounted in a casting mold.

Reference numerals 1 and 2 denote left and right casting molds, which sandwich the core fall prevention baseboard 5 and port baseboard 9 of the intake manifold core 4, respectively, and install the intake manifold core 4 in a predetermined position. .

The operation of the above embodiment will be explained below.

In FIG. 2, molding sand is supplied to the cavity formed by the left and right molding molds 1 and 2, so that the baseboard 5 for preventing the core from collapsing is replaced by the baseboard 6 for the carburetor hole.
integrally through the intake manifold core 4
is molded. At this time, the intake manifold core 4 is attached to the peripheral edge 1 of the carburetor hole baseboard 5 where the core fall prevention baseboard 5 is formed in the mold opening direction.
1 and the peripheral edge 12 of the intake manifold core 4 on which the carburetor hole baseboard 6 is formed are made to match.

The intake manifold core 4 can be easily taken out by opening the molding molds 1 and 2, which are divided into left and right halves, to the left and right.

That is, the mold part 13 that faces the shapes of the peripheral edges 11 and 12 of the carburetor hole baseboard 6 and the intake manifold core 4 has a shape that matches the shape of the peripheral edges 11 and 12 in the mold opening direction of the mold. This is because there is a draft angle of .

As described above, according to the intake manifold core manufacturing mold of the present invention, the insert 3 in the conventional molding molds 1 and 2 shown in FIG. 1 can be made unnecessary.

Next, the intake manifold core 4 molded using the molding die shown in FIG. 2 is mounted in the casting molds shown in FIGS. 3a and 3b, and is cast.

As is clear from this figure, the intake manifold core 4 installed in the casting mold is restrained and held by the left and right casting molds at the core fall prevention baseboard 5 and the port baseboard 9, and is It is possible to completely prevent the intake manifold core 4 from falling (floating or sinking).

Then, by filling the cavity formed between the casting molds 1 and 2 and the intake manifold core 4 with molten metal, the intake manifold casting is made without any problems such as variations in the thickness of the cast product or poor hot water circulation. It can be manufactured without producing any defects.

Note that the carburetor hole of the intake manifold has a circumferential edge 11 of the carburetor hole baseboard 6 on which the core fall prevention baseboard 5 is formed and a circumferential edge 12 of the intake manifold core 4 on which the carburetor hole baseboard 6 is formed. Since the molding dies 1 and 2 are aligned in the opening direction, the shape has a partial notch, but this does not affect the carburetor hole function.

[Effect of idea]

As is clear from the above, according to the mold for forming the intake manifold core according to the present invention,
Since the intake manifold core can be molded using a mold that is divided into left and right or upper and lower halves, the configuration of the mold can be simplified.

Furthermore, an intake manifold core molded using an intake manifold core mold has the advantage that it is possible to completely prevent the core from falling (floating or sinking) during casting.

Furthermore, when an intake manifold is cast using the intake manifold core molded according to the present invention, a portion of the carburetor hole of the intake manifold product will have a cutout shape, but this will not affect the function of the product.

[Brief explanation of the drawing]

Figure 1 is a diagram showing a conventional core molding die, Figure 2 is a diagram showing a core molding die according to the present invention, and Figure 3a is a front view of an intake manifold core placed in a casting mold. FIG. 3b shows a side sectional view of FIG. 3a. 1...Right mold, 2...Left mold, 3...Insert, 4
...Intake manifold core, 5...Baseboard to prevent core from falling, 6...Carburetor hole baseboard, 7...
Carburetor hole cutout shape, 8...Carburetor hole cutout, 9...Port baseboard.

Claims (1)

[Scope of claim for utility model registration] A baseboard that can be held in a casting mold to prevent the core from collapsing,
In the intake manifold core molding mold, which is integrally formed through a carburetor hole baseboard, and in which the intake manifold core is molded by a molding mold that is divided into left and right or top and bottom, the above-mentioned A shape in which the periphery of the carburetor hole baseboard on which the core fall prevention baseboard is formed and the periphery of the intake manifold core on which the carburetor hole baseboard is formed in the mold opening direction of the molding die are aligned. A mold for forming an intake manifold core, and a portion of the mold that faces the shape of the peripheral edge of the carburetor hole baseboard and the intake manifold core, and a shape of the peripheral edge in the mold opening direction of the mold. A mold for forming an intake manifold core, characterized in that draft angles of matching shapes are provided so that the intake manifold core can be molded by the mold divided into left and right or upper and lower halves.