JP2010284667A - Casting mold and casting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a casting mold and a casting method capable of preventing a core from being damaged, enhancing the manufacturing yield, and improving the production efficiency. <P>SOLUTION: The casting mold includes: a first main mold 20 and a second main mold 22 arranged with mold surfaces opposite to each other; a fitting core 40 arranged between opposing surfaces of the first main mold 20 and the second main mold 22 with their mold surfaces being opposite to each other; a first core 30 which is arranged between the opposing mold surfaces of the first main mold 20 and the fitting core 40 to form a first cavity on the first main mold side; and a second core 32 which is arranged between the opposing mold surfaces of the second main mold 22 and the fitting core 40 to form a second cavity on the second main mold side. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a casting mold using a core and a casting method.

  A method of manufacturing a cast product having a hollow portion using a core has been performed for a long time. 9 and 10 show examples of casting molds using a core. 9 is a cross-sectional view of a state in which the core 14 is disposed in the mold and the first main mold 10 and the second main mold 12 are combined, and FIG. 10 shows the core 14 in the first main mold 10. It is a front view of the state which has arrange | positioned.

Two casting molds are used, and the first main mold 10 and the second main mold 12 are provided with mold parts 10a and 10b and mold parts 12a and 12b on the mold surfaces, respectively. The core 14 is a two-piece structure in which two hollow forming portions 14a and 14b are connected in accordance with the mold portions 10a and 10b and the mold portions 12a and 12b.
From the hollow forming portions 14a and 14b, the cast hole forming portions 15a and 15b extend in a rod shape on both sides. The cast hole forming portions 15a and 15b are for forming a cast hole in a cast product. The core 14 includes two hollow forming portions 14a and 14b and cast hole forming portions 15a and 15b. Is formed in a cross-beam shape.

The core 14 has cast hole forming portions 15a and 15b in grooves 11a and 11b formed on the mold mating surfaces (surfaces to be brought into contact with when the mold is closed) of the first main mold 10 and the second main mold 12. And is supported by the first main mold 10 by bonding with an adhesive.
In the casting method using a core, the core support method in the main mold and the shape of the core are appropriately designed according to the complex shape of the product so that the core does not shift due to the molten metal injection pressure. It has been done.

Japanese Examined Patent Publication No. 48-21669 Japanese Patent Laid-Open No. 3-18457

In the casting method using the core, the core is set in the main mold in a state where the mold is opened, and after the mold is matched, the casting is performed by injecting the molten metal into the cavity.
In a continuous casting machine that continuously molds and casts a main mold with a molding machine, the core is sequentially supplied to the main molds formed one after another by the molding machine, and after the molds are aligned, the casting mold is supplied with molten metal. Move to the position and pour the molten metal into the casting mold. The core is set manually, but in such a continuous casting apparatus, the time available for setting the core is set to a short time such as 10 seconds.

In the casting mold shown in FIG. 10, two cores 14 are used so that two cores 14 can be set in one operation, and the time for setting the cores in the main mold is as long as possible. This shortens the manufacturing efficiency.
The method of obtaining a large number of casting molds is first considered as a method for improving the production efficiency. However, if a large number of casting molds are taken, it takes time to set the cores. Therefore, a method in which the cores are formed in multiples so that a large number of cores can be set at one time. Can be considered. However, if the cores are formed in multiples, the cores are likely to be damaged, and the cores are broken when the cores are transported or set in the main mold. On the contrary, there arises a problem that the improvement of productivity is hindered.

  The present invention has been made to solve these problems, and prevents the core from being damaged during the casting operation, improving the production yield, and improving the production efficiency. And a casting method.

  The casting mold according to the present invention includes a first main mold and a second main mold that are arranged with their mold surfaces facing each other, and a mold between the opposed surfaces of the first main mold and the second main mold. A mounting core disposed with its surfaces facing each other, and a first cavity formed between the first main mold and the mold surface facing the mounting core, and forming a first cavity on the first main mold side. A first core, and a second core that is disposed between opposing mold surfaces of the second main mold and the mounting core and that forms a second cavity on the second main mold side. .

  A support portion of the first core is fitted to a mating surface of the mounting core with the first main mold, and a groove for fixing the first core to the mounting core is provided. A groove for fixing the second core to the mounting core is provided on a mating surface of the mounting core with the second main mold, and a support portion of the second core is fitted. Thus, the first core and the second core can be attached to the mounting core without causing the first core and the second core to be displaced.

Casting efficiency can be further improved by arranging two or more attachment cores in the plane of the opposing surfaces of the first main mold and the second main mold.
Further, the casting mold is provided with an injection portion for injecting molten metal in common to the first main mold and the second main mold, and the first main mold and the second main mold include: By providing a flow path that communicates the injection portion with the first cavity and the second cavity, casting can be performed using the molten metal efficiently.
Further, by using the cast hole forming portion as the support portion of the core, the first core and the second core can be reliably supported and cast.
The mounting core includes a first mounting core disposed to face the first main mold and a second mounting core disposed to face the second main mold. By being provided and formed hollow, it is possible to reduce the weight of the mounting core, facilitate the handling of the mounting core, and improve the efficiency of the casting operation.

  In the casting method according to the present invention, the first core is attached to one side of the mounting core facing the mold surface of the first main mold, and the mounting is opposed to the mold surface of the second main mold. An assembly step of a composite core for attaching a second core to the other surface side of the core, and fixing and supporting the first core and the second core to the attachment core; and the composite core Mounting a child on the mold surface of the first main mold, aligning the second main mold with the first main mold on which the composite core is mounted, and the first main mold. A first cavity formed by a mold, the mounting core and the first core; a second cavity formed by the second main mold, the mounting core and the second core; And a step of injecting molten metal into the cavity.

  As the mounting core, grooves for fixing the first core and the second core are formed on the mold-matching surface with the first main mold and the mold-matching surface with the second main mold, respectively. In the process of assembling the composite core, the supporting portion provided in the first core is fitted into the groove provided in the mounting core in the assembly process of the composite core. The core is fixed to the mounting core, and the support portion provided on the second core is fitted into the groove provided on the mounting core to fix the second core to the mounting core. Thus, the first core and the second core can be easily assembled to the mounting core, and the efficiency of the casting operation can be improved.

  According to the casting mold according to the present invention, the first core and the second main mold are cast by fixing the first core and the second core to the mounting core. Can be cast, and the casting efficiency can be improved. Further, by attaching the first core and the second core to the mounting core, the first core and the second core can be cast without being displaced. According to the casting method of the present invention, the first core is manufactured by mounting the composite core having the first core and the second core attached to the mounting core to the main mold and casting. In addition, the production efficiency can be improved by preventing the damage of the second core and improving the manufacturing yield, and improving the efficiency of the operation of attaching the core to the main mold.

It is sectional drawing of the casting die using an attachment core. It is the front view which looked at the 1st main type from the type matching surface direction. It is the front view which looked at the state which attached the 1st core to the attachment core from the type | mold alignment surface direction. It is explanatory drawing which shows the state which mounts an attachment core to a 1st main type | mold. It is sectional drawing of the state which inject | pours molten metal into the cavity of a casting mold, and is casting. It is a perspective view of a cast product. It is sectional drawing which shows the other structural example of a casting mold. It is a perspective view which shows the state which mounted | wore the main mold with the some composite core. It is sectional drawing which shows the example of a casting mold provided with a core. It is the front view which looked at the casting mold shown in FIG. 9 from the die-matching surface direction.

(Casting mold configuration)
FIG. 1 is a cross-sectional view showing a configuration of an embodiment of a casting mold according to the present invention, and shows a cross-sectional view of a state in which a core is arranged and matched with a main mold.
The casting mold 50 of this embodiment holds the core separately in both the first main mold 20 and the second main mold 22 which are main molds used in combination, and forms a cavity for product molding in both. It is characteristic to have a structure. In the case of arranging the core in the main mold, conventionally, as shown in FIG. 9, one core is arranged in a cavity formed by a set of main molds. On the other hand, the casting mold 50 of the present embodiment forms a first cavity (A) in which the first core 30 is arranged in the first main mold 20, and the second main mold 22 has a second cavity. A second cavity (B) in which the core 32 is arranged is formed, and two sets of cores are arranged in the mold matching direction so that two sets of products can be cast by one casting.

  Since both the first main mold 20 and the second main mold 22 hold the first core 30 and the second core 32, the first core 30 and the second core 32 are used. The mounting core 40 is used, and the mounting core 40 is supported by the first main mold 20 and the second main mold 22. The first main mold 20 and the second main mold 22 are arranged such that the fitting core 40 is sandwiched between mold surfaces facing each other of the first main mold 20 and the second main mold 22 when the molds are matched. .

  A product molding die 20a is formed on the inner surface (mold surface) of the first main mold 20 facing the mounting core 40, and the product of the mounting core 40 on the surface facing the first main mold 20 is also provided. A mold part 40a for molding is formed. A product molding die 22a is formed on the inner surface of the second main mold 22 facing the mounting core 40, and the product molding mold 22a is also formed on the surface of the mounting core 40 facing the second main mold 20. A mold part 40b is formed.

FIG. 2 is a front view of a mold surface of the first main mold 20 (a surface facing one surface of the mounting core 40). Since the first main mold 20 of the present embodiment has four products, four mold parts 20a for product molding are formed on the mold surface. Four mold parts 20a are arranged in series, and grooves 21a and 21b are formed in an arrangement communicating with the respective mold parts 20a. These grooves 21a and 21b are formed on the die mating surface of the first main mold 20 (the surface on which the mounting core 40 abuts), and a core hole forming portion for forming a core hole is inserted. Width and depth dimensions to be formed. The groove 211 provided in the middle of the groove 21a is a groove for positioning in the left-right direction when setting the core.
A positioning hole 24 for aligning the mounting core 40 with the first main mold 20 is formed in the mold matching surface of the first main mold 20.
The configuration of the second main mold 22 is the same as that of the first main mold 20 shown in FIG.

FIG. 3 shows a state in which the first core 30 is disposed on the mounting core 40 as viewed from the direction of the first main mold 20. The mounting core 40 is also formed with four mold parts 40a for product molding. The mold part 40a is provided in an arrangement facing the mold part 20a formed in the first main mold 20, and grooves 41a and 41b are formed in an arrangement communicating with the mold part 40a.
The first core 30 includes a hollow forming portion 30a disposed in the cavity and cast hole forming portions 31a and 31b for forming a punch hole extending laterally from the hollow forming portion 30a. Casting hole forming portions 31a and 31b are fitted into the grooves 41a and 41b, and the hollow forming portion 30a is supported so as to be spanned between the cavities by the casting hole forming portions 31a and 31b. In the present embodiment, the punched hole forming portions 31a and 31b correspond to the support portion of the core.
A protrusion 311 is formed in the middle of the punched hole forming portion 31a, and the protrusion 311 is fitted into the groove 411 provided in the middle of the groove 41a, so that the horizontal position of the first core 30 is positioned.

In the present embodiment, the core formed in a cross beam shape by the two hollow forming portions 30a and the cast hole forming portions 31a and 31b is set as one unit, and the two units are attached to the mounting core 40, and all the molds are formed. A core is attached to the portion 40a. Since the core is attached to both the one surface facing the first main mold 20 and the other surface facing the second main mold 22 to the mounting core 40, as one mounting core 40 as a whole, Install the four core units.
It is also possible to attach a unit having four hollow forming portions instead of the above unit, and it is also possible to attach a single unit provided with cast hole forming portions 31a and 31b in one hollow forming portion 30a. It is. For the reason that the number of products of the mounting core 40 is taken and the core is not damaged at the time of handling, it is preferable to use a number of units as appropriate.

  The configuration of the surface facing the second main mold 22 of the mounting core 40 is the same as the configuration shown in FIG. Grooves to which the four mold parts 40a for product molding and the cast hole forming parts 33a, 33b of the second core 32 are attached are formed. Two units are mounted so as to fit the cast hole forming portions 33a and 33b into the groove portions. Positioning protrusions that fit into the positioning holes 24 formed in the first main mold 20 on the mold matching surface facing the first main mold 20 and the mold matching surface facing the second main mold 22 of the mounting core 40. 44 is provided.

(Casting method)
In the casting process according to the present invention, first, the first core 30 and the second core 32 are attached to the attachment core 40, and the attachment core 40 attached with the core is attached to the main mold for casting. .
The first core 30, the second core 32, and the mounting core 40 are formed in advance in separate steps. FIG. 4A shows a state (composite core) in which the first core 30 and the second core 32 are attached to one surface and the other surface of the attachment core 40.

The first core 30 and the second core 32 are attached by inserting the cast hole forming portions 31a and 31b into the grooves 41a and 41b formed in the mounting core 40 and bonding them with an adhesive. When the adhesive is cured, the first core 30 and the second core 32 are firmly held by the mounting core 40 (an assembly process of the composite core).
With the first core 30 and the second core 32 attached to the mounting core 40, the first core 30 and the second core 32 are securely held by the mounting core 40 and fall off. There is nothing. FIG. 4A shows a state in which the half cross-sectional portions of the cast hole forming portions 31a, 31b, 33a, and 33b are fitted in the grooves 41a and 41b.

  The operation of attaching the first core 30 and the second core 32 to the attachment core 40 can be performed at the time of casting, or the first core 30 and the second core 32 can be attached to the attachment core 40. It is also possible to assemble and prepare the composite core attached with the key beforehand and perform only the operation of mounting the composite core to the main mold during the casting operation.

  FIG. 4B shows a state in which the composite core is mounted on the first main mold 20 (a composite core mounting step). When the composite core is mounted on the first main mold 20, the positioning protrusions 44 provided on the mounting core 40 are mounted by being fitted into the positioning holes 24 of the first main mold 20. As a result, the first main mold 20 and the mounting core 40 are positioned relative to each other, and one half of the mounting core 40 is mounted on the first main mold 20. In the case of a vertical casting mold, the composite core is vacuum-sucked and supported by the core mask, and the composite core is matched with the first main mold 20 in a state where the composite core is supported by the core mask. Then, the vacuum is released and the composite core is attached to the first main mold 20 (state shown in FIG. 4B).

  In a state where the composite core is mounted on the first main mold 20, the other half of the composite core protrudes from the mold mating surface of the first main mold 20. In this state, the second main mold 22 is aligned with the mounting core 40 to perform mold matching (mold matching process). The positioning protrusions 44 formed on the mounting core 40 are fitted into the positioning holes 24 formed on the second main mold 22, and the mounting core 40 and the second main mold 22 are aligned with each other. Is done.

FIG. 5 shows a state in which the first main mold 20 and the second main mold 22 are matched and molten metal is injected into the first cavity and the second cavity (molten injection process).
FIG. 6 shows a perspective view of the cast product 60 obtained by the casting mold 50. The cast product 60 is formed in a hollow shape and is provided with cast holes 61 and 62 penetrating the side surfaces.

  In the casting method of this embodiment, casting is performed using a composite core in which the first core 30 and the second core 32 are attached to the attachment core 40. In addition to the action of positioning the first core 30 and the second core 32 with respect to the main mold, the method using the composite core includes the first core 30 and the second core 32 It is securely held by the mounting core 40, can be handled without damaging the core during handling such as transportation, and has an effect of improving the productivity by improving the efficiency of the operation of mounting the core on the main mold. .

  In a core used for manufacturing a product having a small-diameter casting hole such as a diameter of 5 mm or less, the core-hole forming portion becomes thin, so that the core is easily broken during operations such as conveyance. In the casting process of such products, care must be taken not to damage the core. If the composite core once holding the core is formed in the mounting core 40 as in the present embodiment and transported in the state of the composite core or mounted on the main mold, the core is easily damaged. Even a child can be handled without being damaged by being held by the attachment core.

Because it can be handled without damaging the core, it is fragile even when the operation to attach the core to the main mold needs to be performed in a short time, like a continuous casting machine using a molding machine. By handling the composite core instead of directly handling the core, the handling of the core can be facilitated, and the manufacturing yield and work efficiency can be improved.
In addition, by handling the composite core, a large number of cores can be handled at a time by a single operation, and it is possible to easily cope with a casting mold having a large number of pieces.
In mass production, a large number of cores are prepared in advance. Even in such a case, by preparing a composite core that supports the core in the mounting core, it is possible to carry out operations such as transportation. It is possible to prevent the core from being damaged and improve the working efficiency.

  The mounting core 40 used in the casting mold 50 described above is integrally formed by providing a mold portion 40a on one surface and the other surface facing the first main mold 20 and the second main mold 22. The mounting core 40 is formed into a hollow shape by combining the first mounting core 42 and the second mounting core 43 as shown in FIG. It can also be formed. The first mounting core 42 forms a mold part 42 a on the surface facing the first main mold 20, and the second mounting core 43 forms the mold part 43 a on the surface facing the second main mold 22. Are molded.

By making the mounting core 40 hollow in this way, the mounting core 40 can be reduced in weight, and the operation of mounting the composite core on the main mold can be facilitated. Further, the material required for forming the mounting core can be reduced. The mounting core 40 is used by adhering the first mounting core 42 and the second mounting core 43 together.
As a method of forming the first mounting core 42 and the second mounting core 43 in a hollow state, a reverse sand discharge hollow molding, a molding method using a mandrel, or the like can be used.
The mounting core 40 is crushed after casting and is only partially recovered. Reducing the capacity of the material used for the mounting core 40 is effective in reducing the manufacturing cost in combination with the molding cost of the mounting core 40.

Since the casting method of the present embodiment is cast by forming cavities in both the first main mold 20 and the second main mold 22, the product in the main mold is compared with the conventional casting mold shown in FIG. Even if the same number is taken, the production efficiency can be doubled.
In addition, the first core 30 and the second core 32 are securely held by clamping the punched hole forming portion with the die mating surfaces of the main mold and the mounting core, and the pressure of the molten metal It is possible to prevent the first core 30 and the second core 32 from being displaced from each other, improve the hot water supply property, and improve the product quality and the production yield.

In addition, although the product of the said embodiment is an example in which the casting hole was provided in two places on the upper and lower sides of the main body, the hole diameter, the arrangement position, and the number of arrangements of the casting hole are different depending on the product. The part is also provided in an appropriate arrangement according to the product. In the present embodiment, the cored hole forming portions 31a and 31b are used as core support portions. However, a structural portion other than the cored hole forming portion can also be used as the core support portion.
Further, in the above embodiment, for the sake of explanation, the cast product 60 as shown in FIG. 6 has been described as an example. However, the casting mold according to the present invention can be used to manufacture various types of cast products. . Moreover, although the number of products taken on one side of the mounting core 40 in the above embodiment is four, the number of products taken may be one or more.

  Further, the number of mounting cores attached to the main mold is not limited to one. FIG. 8 shows an example in which four mounting cores 40 are mounted in the surface of the first main mold 20. As described above, even when a plurality of mounting cores 40 are mounted in the mold matching surface of one casting mold, the first core 30 and the second core 32 are attached to the mounting core 40. If the method is to cast the attached composite core to the main mold and cast it, a large number of cores can be turned into the main The operation to attach to can be completed.

In the example shown in FIG. 8, after the composite core 46 is mounted on the first main mold 20, the second main mold 22 is matched, and the molten metal is injected into the injection portion 52 and cast. The figure shows a state in which the composite core 46 is attached to the first main mold 20. The first main mold 20 and the second main mold 22 are provided with flow paths 54 communicating with the cavities formed in the composite cores 46, and the molten metal supplied to the injection part 52 passes through the flow paths 54. Via each of the cavities.
By providing the injection part 52 in common to the first main mold 20 and the second main mold 22, the molten metal can be efficiently used for casting.

20 first main mold 20a mold part 21a, 21b groove 22 second main mold 22a mold part 30 first core 30a hollow forming part 31a, 31b cast hole forming part 32 second core 33a, 33b casting Punching hole forming part 40 Mounting core 40a Mold part 41a, 41b Groove 42 First mounting core 43 Second mounting core 42a, 43a Mold part 46 Composite core 50 Casting mold 52 Injection part 54 Channel 60 Casting product

Claims (8)

A first main mold and a second main mold which are arranged to face each other;
A mounting core disposed between opposing surfaces of the first main mold and the second main mold, with the mold surfaces facing each other;
A first core disposed between opposing mold surfaces of the first main mold and the mounting core, and forming a first cavity on the first main mold side;
A casting comprising: the second main mold and a second core which is disposed between opposing mold surfaces of the mounting core and forms a second cavity on the second main mold side. Type. A support portion of the first core is fitted to a mating surface of the mounting core with the first main mold, and a groove for fixing the first core to the mounting core is provided. ,
A groove for fixing the second core to the mounting core is provided on a mating surface of the mounting core with the second main mold so that the support portion of the second core is fitted. The casting mold according to claim 1, wherein:   The casting mold according to claim 1 or 2, wherein two or more of the mounting cores are arranged in a surface of an opposing surface of the first main mold and the second main mold. The casting mold is provided with an injection portion for injecting molten metal in common to the first main mold and the second main mold,
The first main mold and the second main mold are each provided with a flow path that communicates the injection portion, the first cavity, and the second cavity. The casting mold according to any one of 1 to 3.   The casting mold according to any one of claims 1 to 4, wherein the support portion of the core is formed as a cast hole forming portion.   The mounting core includes a first mounting core disposed to face the first main mold, and a second mounting core disposed to face the second main mold, The casting mold according to any one of claims 1 to 5, wherein the casting mold is hollow. The first core is attached to one surface side of the mounting core facing the mold surface of the first main mold, and the second core is attached to the other surface side of the mounting core facing the mold surface of the second main mold. Attaching the core, and assembling the composite core for fixing and supporting the first core and the second core to the mounting core;
Attaching the composite core to the mold surface of the first main mold;
Matching the second main mold to the first main mold fitted with the composite core;
Formed by a first cavity formed by the first main mold, the mounting core and the first core, and by the second main mold, the mounting core and the second core. And a step of injecting molten metal into the second cavity. The mounting core has grooves for fixing the first core and the second core to the mating surface of the first main mold and the mating surface of the second main mold, respectively. Formed,
In the assembly process of the composite core, a support portion provided on the first core is fitted into a groove provided on the mounting core to fix the first core to the mounting core. The support portion provided on the second core is fitted into a groove provided on the mounting core to fix the second core to the mounting core. Casting method.

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