JP2023064507A - Core formation method - Google Patents

Abstract

To provide a core formation method that enables suppression of the occurrences of burring and occurrences of setting failure.SOLUTION: A core formation method is provided for forming a core comprising a core print portion to be set in a core print reception portion of a metal mold for casting. Dimensions of the core print reception portion in a thermally deformed metal mold for casting is measured. On the basis of changes in the measured dimensions, a shape of a core print formation portion for forming a core portion in the metal mold for core forming is modified, and by using the metal mold for core formation, a core comprising a core print portion fitted to the core print reception portion of the metal mold for casting is formed.SELECTED DRAWING: Figure 3

Description

The present invention relates to a core molding method.

The core is provided with a baseboard portion so as to fit with a baseboard receiving portion of the casting mold. For example, Patent Literature 1 discloses a technique related to a core seating state detection device capable of determining whether or not the core is correctly set in the mold.

JP-A-06-142833

However, due to thermal deformation of the casting mold due to heating during casting, a deviation may occur between the baseboard receiving portion of the casting mold and the baseboard portion of the core. In this case, there is a problem that burrs are generated in the cast product, and a set failure occurs due to interference between the casting mold and the core.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a core molding method capable of suppressing the occurrence of burrs and poor setting.

A core molding method according to an aspect of the present invention comprises:
A method for molding a core provided with a baseboard portion to be set in a baseboard receiving portion of a casting mold,
Measuring the dimensions of the baseboard receiving portion in the casting mold after thermal deformation,
changing the shape of the baseboard forming part for forming the baseboard part in the core molding mold based on the measured change in the dimension;
The method comprises using the core molding die to mold the core provided with the baseboard portion that fits into the baseboard receiving portion of the casting mold after thermal deformation.

In the core molding method according to one aspect of the present invention, the dimension of the baseboard receiving portion in the casting mold after thermal deformation is measured, and based on the change in the dimension, the baseboard of the core molding mold is measured. Change the shape of the molded part. By using the core molding die, it is possible to mold a core provided with a baseboard portion that fits into the baseboard receiving portion of the casting mold after thermal deformation. According to the method for molding a core according to an aspect of the present invention, it is possible to suppress the deviation between the baseboard receiving portion of the casting mold and the baseboard portion of the core. It is possible to suppress the occurrence of set failure due to occurrence and interference between the casting mold and the core.

According to the present invention, it is possible to provide a core molding method capable of suppressing the occurrence of burrs and poor setting.

1 is a schematic cross-sectional view showing structures of a casting mold and a core according to a first embodiment; FIG. 1 is a schematic cross-sectional view showing structures of a casting mold and a core according to a first embodiment; FIG. 4 is a flow chart showing a core molding method according to the first embodiment. FIG. 4 is a schematic diagram showing a state of dimension measurement according to the first embodiment; 1 is a schematic cross-sectional view showing the structure of a core molding die according to a first embodiment; FIG. 1 is a schematic cross-sectional view showing structures of a core molding die and a core according to a first embodiment; FIG.

Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. Also, for clarity of explanation, the following description and drawings are simplified as appropriate. The right-handed xyz orthogonal coordinates shown in FIGS. 1, 2, and 4 to 6 are for convenience in explaining the positional relationship of each component. Usually, the z-axis positive direction is vertically upward, and the xy plane is the horizontal plane.

<First embodiment>
First, structures of a casting mold 1 and a core 10 according to the first embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 and 2 are schematic cross-sectional views showing structures of a casting mold 1 and a core 10, respectively, according to the first embodiment.

As shown in FIG. 1 , the casting mold 1 has a cavity 2 and a baseboard receiving portion 3 . The core 10 is provided with a baseboard portion 11 . The casting mold 1 is, for example, a concave mold. The casting mold 1 is formed using a material with excellent high temperature resistance. The casting mold 1 is made of metal such as iron or steel. The shapes of the casting mold 1 and the cavity 2 are not particularly limited, and can be arbitrarily shaped according to the shape of the desired casting. The state shown in FIG. 2 can be obtained by sandwiching the core 10 between the two casting dies 1 shown in FIG.

As shown in FIG. 2, the gap between the casting mold 1 and the core 10 forms a cavity 2. As shown in FIG. A cavity 2 formed by the casting mold 1 and the core 10 is filled with molten metal. A casting having a shape corresponding to the cavity 2 is formed by the molten metal that fills the cavity 2 . For example, aluminum, magnesium, copper and alloys thereof can be used as the molten metal. As shown in FIGS. 1 and 2, two casting molds 1 and a core 10 can be used to cast a casting.

As shown in FIG. 1 , a casting mold 1 is provided with a baseboard receiving portion 3 corresponding to a baseboard portion 11 of a core 10 . In the example of FIG. 1 , two baseboard receiving portions 3 are provided for each casting mold 1 . That is, in the two casting molds 1, the baseboard receiving portions 3 are provided at a total of four locations. In addition, the number of baseboard receiving parts 3 is not limited to this, and can be an arbitrary number.

The core 10 is provided with baseboards 11 at four locations. Specifically, two baseboard portions 11 are provided on the x-axis positive direction side and the x-axis negative direction side in such a manner as to project in the z-axis positive direction side from the end face of the core 10 on the z-axis positive direction side. . Two baseboards 11 are provided on the x-axis positive direction side and the x-axis negative direction side so as to protrude from the end surface of the core 10 on the z-axis negative direction side in the z-axis negative direction side.

The shape of the baseboard portion 11 is, for example, a trapezoid when viewed from the zx plane, and corresponds to the shape of the baseboard receiving portion 3 of the casting mold 1 . The shape of the baseboard portion 11 is not particularly limited as long as it corresponds to the shape of the baseboard receiving portion 3 . The baseboard portion 11 is molded using a core molding die 30, which will be described later.
As described above, the core 10 can be accurately set in the casting mold 1 by providing the baseboard receiving portion 3 and the baseboard portion 11 in the casting mold 1 and the core 10, respectively.

A core molding method according to the present embodiment will be described below with reference to FIGS. 3 to 6. FIG. FIG. 3 is a flow chart showing a core molding method according to the first embodiment. FIG. 4 is a schematic diagram showing a state of dimension measurement according to the first embodiment. FIG. 5 is a schematic cross-sectional view showing the structure of the core molding die 30 according to the first embodiment. FIG. 6 is a schematic cross-sectional view showing the structures of the core molding die 30 and the core 10 according to the first embodiment.

The core molding method according to the first embodiment is a method for molding a core 10 provided with a baseboard portion 11 to be set in a baseboard receiving portion 3 of a casting mold 1 . According to the method of molding the core according to the first embodiment, the baseboard portion 11 is provided to fit into the baseboard receiving portion 3 of the casting mold 1 even when the casting mold 1 is thermally deformed. The core 10 thus formed can be molded.

As shown in FIG. 3, the core molding method according to the present embodiment comprises a step of measuring the dimension of the baseboard receiving portion 3 in the casting mold 1 after thermal deformation (step S1), It includes a step of changing the shape of the baseboard forming portion 31 of the mold 30 (step S2) and a step of forming the core 10 provided with the baseboard portion 11 fitted to the baseboard receiving portion 3 (step S3). .

In the core molding method according to the present embodiment, first, as shown in FIG. 4, the dimension of the baseboard receiving portion 3 in the casting mold 1 after thermal deformation is measured (step S1). As described above, the casting mold 1 may be thermally deformed due to heating during casting. In the core molding method according to the present embodiment, for example, the measurement device 20 is used to measure the dimension of the baseboard receiving portion 3 in the casting mold 1 after thermal deformation. A 3D vision, a displacement laser, or the like can be used for the measuring device 20, for example. Thereby, the dimensional data of the baseboard receiving portion 3 in the casting mold 1 after thermal deformation can be acquired.

Next, as shown in FIG. 5, based on the measured dimensional change, the shape of the baseboard forming part 31 for forming the baseboard part 11 in the core forming mold 30 is changed (step S2). . As shown in FIG. 5 , the core molding die 30 has a baseboard forming part 31 for forming the baseboard part 11 . The core molding die 30 can change the shape of the baseboard molding portion 31 by moving the position of the variable portion 32 in the z-axis positive direction or the z-axis negative direction. As a result, the baseboard portion 11 of the core 10 corresponding to the baseboard receiving portion 3 of the casting mold 1 after thermal deformation can be molded. The shape of the variable portion 32 is, for example, a trapezoid when viewed from the zx plane as shown in FIG. The shape of the variable portion 32 is not limited to this, and may be changed according to the desired shape of the baseboard portion 11, or may be any shape.

Note that the shape of the baseboard molding portion 31 may be changed by adjusting the size of the variable portion 32 . For example, the larger the variable portion 32 is, the larger the baseboard forming portion 31 can be, and the larger the baseboard portion 11 to be formed can be. Similarly, the smaller the variable portion 32 is, the smaller the baseboard forming portion 31 can be, and the smaller the baseboard portion 11 to be formed can be. Further, the position of the baseboard molding portion 31 may be changed by moving the position of the core molding die 30 in the x-axis direction or the y-axis direction.

Next, as shown in FIG. 6, using a core molding die 30, a core provided with a baseboard portion 11 fitted to the baseboard receiving portion 3 of the casting mold 1 after thermal deformation is manufactured. 10 is molded (step S3). For example, by moving the position of the variable portion 32 of the core molding die 30 in the z-axis direction, the height of the baseboard portion 11 can be increased as shown in the upper diagram of FIG. The height of the baseboard part 11 can be reduced. As a result, the clearance between the baseboard receiving portion 3 of the casting mold 1 and the baseboard portion 11 of the core 10 can be kept constant, and displacement can be suppressed.

The above steps S1 to S3 may be repeated for each casting. By repeating this process, the core 10 provided with the baseboard portion 11 corresponding to the thermal deformation of the casting mold 1 can be molded for each casting, so that the occurrence of burrs in the cast product and the casting mold 1 It is possible to further suppress the occurrence of set failure due to interference between the core 10 and the core 10 .

As described above, in the core molding method according to the present embodiment, the dimension of the baseboard receiving portion of the casting mold after thermal deformation is measured, and based on the change in the dimension, the baseboard receiving portion A core having mating baseboards can be molded. According to the core molding method according to the present embodiment, it is possible to suppress the deviation between the baseboard receiving portion of the casting mold and the baseboard portion of the core. It is possible to suppress the occurrence of set failure due to interference between the casting mold and the core.

It should be noted that the present invention is not limited to the above embodiments, and can be modified as appropriate without departing from the scope of the invention.

REFERENCE SIGNS LIST 1 casting mold 2 cavity 3 baseboard receiving part 10 core 11 baseboard part 20 measuring device 30 core molding die 31 baseboard molding part 32 variable part

Claims (1)

A method for molding a core provided with a baseboard portion to be set in a baseboard receiving portion of a casting mold,
Measuring the dimensions of the baseboard receiving portion in the casting mold after thermal deformation,
changing the shape of the baseboard forming part for forming the baseboard part in the core molding mold based on the measured change in the dimension;
Using the core molding die, molding the core provided with the baseboard portion that fits into the baseboard receiving portion of the casting mold after thermal deformation.
The molding method of the core.

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