KR102134082B1 - Method of molding core - Google Patents

Abstract

Provided is a method for forming a core, which can easily form a mark on each core. The core molding method includes a first step, a second step, and a third step. In the first step, the block-shaped core member 20 is molded by resin coated sand (RCS). As for the core member 20 to be molded, the identification mark 15 which individually identifies is formed in the surface. The second process is a predetermined position in the cavity 31 of the mold 30 for molding the core 10, and the core formed in the first process so that the identification mark 15 is exposed on the surface of the core 10 to be molded. The member 20 is arranged. In the third process, after the core member 20 is disposed in the cavity 31 in the second process, the resin coated sand (RCS) is filled in the cavity 31 to mold the core 10.

Description

Method of molding core

The present invention relates to a method for forming a medium character.

Patent Document 1 discloses a conventional method for forming a core. The core molded by this molding method is ejected to each cast product to be cast, and a mirror image of an identification mark for individually identifying each cast product is formed on the surface. The identification mark consists of a main part and an additional part. The main part of the identification mark is a type, a casting lot number, and the like, and is common to each of a plurality of casting products to be cast and is dispensed. In one side, the additional part of the identification mark is a casting date, a casting number, and the like, and is individually ejected for each casting product to be cast. This core molding method includes a first step and a second step. In the first step, a mirror image corresponding to the main part of the identification mark is formed on the surface of the core. This mirror image is formed on the surface of the core while forming the core by using a mold formed on the inner surface of the cavity, the main portion of the identification mark. In the second step, a mirror image corresponding to the additional portion of the identification mark is formed on the core. This mirror image is engraved by a marking device after coating a coating agent on a molded core to increase strength. As described above, in this method of forming the core, there is little replacement or modification of the mold used for the formation of the core, and individual mirror images can be formed for each core.

Patent Document 1: Japanese Patent Application Publication No. 2012-183547

However, in the method of forming the core of Patent Document 1, in order to form an individual mirror image for each core, a second step of engraving the mirror image on the core by a marking device is required, and labor is required. In addition, in this method of forming the core, when digging a thin phase in the second step, the depth of the thin phase is shallow to suppress the drop in strength of the core. For this reason, the cast product cast using this core may be inferior to the identification of the identification mark.

The present invention has been made in view of the above-mentioned conventional circumstances, and has an object to solve the problem of providing a molding method of a core that can easily form a mark on each core among different cores.

The molding method of the core of the present invention includes a first step, a second step, and a third step. In the first step, a block-shaped core member is molded by casting sand. In the molded core member, an identification mark for individually identifying is formed on the surface. The second step is a predetermined position in the cavity of the mold for molding the core, and the core member molded in the first step is disposed so that the identification mark is exposed on the surface of the molded core. In the third step, after the core member is disposed in the cavity in the second step, the core is molded by filling the casting sand into the cavity.

In this method of forming the core, an identification mark for individually identifying is formed on the surface of the core member to be molded in the first step. Here, the identification mark to be individually identified is, for example, a letter or symbol containing a continuous serial number. Then, in this method of forming the core, the core member molded in the first step is disposed such that the identification mark is exposed on the surface of the core being molded as a predetermined position in the cavity of the mold for molding the core in the second step. In addition, in this method of forming the core, after the core member is disposed in the cavity in the second process in the third process, the core is molded by filling the casting sand into the cavity.

The core has a core print supported by the casting mold when it is set in the casting mold casting the casting product. Then, in the second step of the method of forming the core, the core member may be disposed at a portion where the core print is molded.

BRIEF DESCRIPTION OF THE DRAWINGS The top view which shows the core shape|molded by the molding method of the core shape of 1st Embodiment.
Fig. 2 is a perspective view showing a core member to be molded in the first step of the method for forming cores in Embodiment 1;
3 is a cross-sectional view showing a second step of the molding method of the core of the first embodiment.
4 is a cross-sectional view showing a third step of the method for forming the core of Embodiment 1;

Embodiment 1 in which the molding method of the core of the present invention is embodied will be described with reference to the drawings.

<Embodiment 1>

The core molding method includes a first step, a second step, and a third step. The core 10 molded by this core molding method has a plurality of core bodies 11 and a pair of core prints 13 as shown in FIG. 1. The core 10 is integrated with a pair of core prints 13 connected to both ends of a plurality of core bodies 11. When a pair of core prints 13 are set in a casting mold (not shown) for casting a cast product, the core mold 11 is placed in a suspended state in the cavity of the casting mold, so that it is placed in the casting mold. This is the supporting part. In the core 10, an identification mark 15 (Z-15X301-1-001) is formed in a concave character on the core print 13. The identification mark 15 identifies the core 10 individually, and can also individually identify each cast product to be cast. For this reason, the identification mark 15 contains consecutive serial numbers (-001, -002, -003, ...).

Each core 10 is formed with a different identification mark 15 on the core print 13 in a concave character. For this reason, in the core loading step in the casting process, when the core 10 is actually placed in the cavity of the casting mold, the core 10 and the casting product can be associated and registered and managed in a database. . In this way, even after casting in which the core 10 is crushed, it is possible to specify the core 10 used for casting for each cast product. For this reason, when the cast product was defective, it is possible to individually check the manufacturing information of the core 10 used for casting the cast product to investigate the cause of the defect.

The first step is a rectangular parallelepiped, and the block-shaped core member 20 (see FIG. 2) is molded by a resin coated sand (RCS). Specifically, this core member 20 is molded by a shell mold method. The mold (not shown) for molding the core member 20 has a rectangular parallelepiped shape, and a stiffness cavity slightly larger than the outer shape of the core member 20 is formed. In addition, in this mold, a mirror image of the identification mark 15 is formed on one of the inner surfaces in convex characters. This convex character can be removed and changed to a mirror image of another identification mark 15. The core member 20 is molded by filling a resin coated sand (RCS) in the cavity of the mold.

The molded core member 20 is formed in a state in which the identification mark 15 (Z-15X301-1-001) is recessed on one side, as shown in FIG. 2. That is, in each core member 20, different identification marks 15 (Z-15X301-1-001, Z-15X301-1-002, Z-15X301-1-003, ...) are formed on one side.

As described above, in the first process, the convex characters, which are mirror images of the identification marks 15 formed on the inner surface of the cavity of the mold, are removed and changed into the mirror images of the other identification marks 15, so that the other identification marks 15 are on the surface. The formed plurality of core members 20 are molded. At this time, since the core member 20 is in a block shape, the core member 20 in which other identification marks 15 are formed on the surface can be easily molded.

As shown in FIG. 3, the second step uses a mold 30 having a pair of left and right molds 30A, 30B, and a cavity 31 for molding the core 10. In the second step, in the state in which the left and right molds 30A and 30B of the mold 30 are separated, the core member molded in the first step at a predetermined position in the cavity 31 formed in one of the left and right molds 30A ( 20). The predetermined position in the cavity 31 in which the core member 20 is disposed is a portion 33 in which the core print 13 of the core 10 is molded. Further, the core member 20 is disposed such that the identification mark 15 formed on one side of the core member 20 is exposed on the surface of the core 10 to be molded.

In the third step, as shown in FIG. 4, the middle member 20 is disposed in the cavity 31 of the mold 30 for molding the core 10 in the second step, and the left and right types 30A, 30B are formed. After this combination, the resin coated sand (RCS) in the cavity 31 is ejected from the ejection opening provided in the mold 30. Then, the resin coated sand (RCS) is filled in the cavity 31 to mold the core 10. In this way, the core 10 shown in Fig. 1 can be molded.

As described above, the molding method of the core of the first embodiment includes a first step, a second step, and a third step. The first step is a rectangular parallelepiped, and the block-shaped core member 20 is molded by resin coated sand (RCS). The molded core member 20 is formed in a state in which an identification mark 15 for individually identifying each cast product to be cast is recessed. The second process is a predetermined position in the cavity 31 of the mold 30 for molding the core 10, and the core formed in the first process so that the identification mark 15 is exposed on the surface of the core 10 to be molded. The member 20 is arranged. In the third process, after the core member 20 is disposed in the cavity 31 in the second process, the resin coated sand (RCS) is filled in the cavity 31 to mold the core 10.

In this method of forming the core, an identification mark 15 for individually identifying each cast product is formed on the surface of the core member 20 to be molded in the first step. Since the core member 20 has a block shape, the core member 20 having the identification mark 15 formed on its surface can be easily molded. In addition, in this method of forming the core, the identification mark 15 is provided on the surface of the core 10 to be molded as a predetermined position in the cavity 31 of the mold 30 that molds the core 10 in the second step. The core member 20 molded in the first process is disposed to expose. Further, in this method of forming the core, the core member 10 is molded by filling the resin coated sand (RCS) in the cavity after the core member 20 is disposed in the cavity in the second process in the third process. In this way, the molding method of this core can mold the core 10 in which the core member 20 is integrated. In this way, the molding method of this core can easily attach the identification mark 15 which individually identifies the cast product to the core 10.

Therefore, in the method of forming the core of the first embodiment, marks different for each core 10 can be easily formed on the core 10.

The core 10 has a core print 13 supported by the casting mold when it is set in the casting mold for casting the cast product. Then, in the second step of the method of forming the core, the core member 20 is disposed in the portion 33 where the core print 13 is molded. For this reason, since the identification mark 15 is not dispensed to the casting product cast using this core 10, it is possible to prevent the identification mark 15 from being injected into the casting product and affecting the quality of the casting product. have.

The present invention is not limited to the first embodiment described by the above description (i) and the drawings, for example, the following embodiments are also included in the technical scope of the present invention.

(1) The identification number is not limited to the form shown in the first embodiment.

(2) In the first embodiment, an identification mark is formed on the core print of the core, but an identification mark may be formed on another part (core body).

(3) Although in the first embodiment, the core member was molded by a shell mold method, it may be molded by another method.

10: middle character 13: core print (core print)
15: identification mark 20: no middle character
30: mold 31: cavity

Claims (2)

A first process of forming a block-shaped core member formed by an identification mark on the surface of an individual identification mark by casting sand;
A second step of arranging the core member molded in the first step so that the identification mark is exposed on the surface of the core to be molded as a predetermined position in the cavity of the mold for molding the core;
In the second step, a third process is provided in which the core member is molded in the cavity after the core member is disposed in the cavity, thereby filling a casting sand into the cavity.
A method of forming a core, wherein the core is formed by integrating the core member,
The core has a core print supported by the casting mold when set in the casting mold for casting the casting product,
In the second step, the core member is disposed in the core print is characterized in that the molding method of the core. delete

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