JP3418859B2 - Mold for forming cast products with holes - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a mold for molding a casting in which a hole is formed, and more particularly, to a seating surface of the casting after casting. The present invention relates to a molding die for molding a cast product without performing trimming or the like. 2. Description of the Related Art For example, when a casting having a hole formed therein for coupling with a counterpart product by a bolt or the like is formed by a mold, a molding die as shown in FIG. 6 is conventionally used. Had been. The molding die 51 includes an insert mold 52 and a mother mold (cavity main body) 53.
2 can be fitted to the matrix 53. The matrix 53 is
When the casting M ′ shown in FIG. 7 is formed, it has a contact surface 53A that comes into contact with the seating surface Z ′ of the casting M ′. The nesting mold 52 is provided with a nesting 54 corresponding to the shape of the hole H 'formed in the bearing surface Z' of the casting M '. [0003] On the other hand, when a casting is cast by casting, burrs of the casting generally occur along the parting direction. Here, in the above-described conventional molding die 51, the nesting mold 52 is fitted to the mother die 53 along a substantially vertical direction to the bearing surface Z 'of the casting M'. I have. For this reason, the parting direction D is a direction substantially along the vertical direction as shown in FIG.
The burr B is generated so as to rise around the hole H 'in the seating surface Z'. Therefore, after that, in the case of performing an operation for processing the seat surface Z ', for example, an operation for threading a bolt groove in the hole H', a trimming operation for removing the burr B and the like before this screwing operation. There was a problem that had to be done. [0004] Therefore, an object of the present invention is to prevent burrs from being generated in the vicinity of a hole in a seat surface of a casting when a casting having a hole formed therein is molded by a mold.
The purpose is to eliminate the need for trimming work. [0005] According to the present invention, which solves the above-mentioned problems, a mold for forming a casting having a hole formed therein is provided by a casting method.
Nest with nests for forming holes in the seating surface of the product
A mold having a mold and a mother
The nesting mold has a contact surface that comes into contact with the seating surface of the cast product, and the nest is formed integrally with the contact surface, and an outer peripheral portion of the contact surface has an outer surface. The table
A par is provided , and the matrix has a taper.
And fitting, entering-subtype locking piece for locking is provided, said tape provided on the outer peripheral portion of the abutment surface of the entering-subtype
The direction along the locking surface between the surface of the par and the locking piece of the matrix is a parting-off direction. Embodiments of the present invention will be specifically described below with reference to the drawings. In FIG. 1, (a)
Is a side sectional view of a molding die according to a reference example of the present invention,
(B) is a side cross-sectional view of a nesting die in a molding die according to a reference example of the present invention, and (c) is a side cross-sectional view of a mother die in the molding die according to the reference example of the present invention. . A molding die (hereinafter, simply referred to as a “molding die”) 1 of a casting having a hole formed therein (referred to below as a reference example)
As shown in FIGS. 1A to 1C, a nesting mold 2 and a mother die 3 fitted to the nesting mold 2 are provided. As shown in FIG. 1 (b), the nesting type 2 is composed of a body 21 and nesting 22. A contact surface 21A is formed on the body 21, and the insert 22 is formed integrally with the contact surface 21A. In addition, the bearing surface Z of the casting M shown in FIG. 2 is formed along the contact surface 21A, and the hole H of the casting M is formed by the insert 22. On the other hand, as shown in FIG. 1C, the matrix 3 includes a main body 31 and a locking piece 32. Body 3
1 is formed so that the shape of the inner peripheral surface 31 </ b> A is substantially the same as the outer shape of the body portion 21 of the nesting mold 2 so that the body portion 21 of the nesting mold 2 can be fitted freely. . Locking piece 32
Contacts the outer peripheral portion of the contact surface 21 </ b> A of the insert mold 2 fitted to the main body 31 to lock the insert mold 2. In the molding die 1, as shown in FIG. 3, the direction along the outer peripheral portion of the nesting mold 2 and the locking surface of the locking piece 32 of the mother die 3,
The parting direction D is set to be substantially horizontal. In the molding die 1, a nesting die 2 and a mother die 3
When is fitted, it becomes as shown in FIG. That is, the contact surface 21 </ b> A and the insert 22 in the insert mold 2 are formed integrally, and the body 21 of the insert mold 2 and the main body 31 of the mother mold 3 are fitted to each other. The outer peripheral portion of the second contact surface 21 </ b> A comes into contact with the locking piece 32 of the matrix 3, and the insert mold 2 is locked to the matrix 3. The seat surface of the cast product formed by the molding die 1 is formed along the inner surface of the contact surface 21 </ b> A of the nesting die 2, which comes into contact with the locking piece 32 of the mother die 3. Therefore, the parting direction D is a direction along the contact surface 21 </ b> A of the trunk portion 21 in the insert mold 2 and the locking surface of the locking piece 32 of the mother die 3, that is, a direction along the horizontal direction. Here, a method for molding a cast product using the molding die according to the present invention will be briefly described. FIG. 4 is a process chart showing a procedure for manufacturing a casting using a molding die according to a reference example of the present invention. First, as shown in FIG. 4A, molten steel Y for producing a cast product is injected into a mother die 3 set in advance. Next, as shown in FIG. 4 (b), the insert mold 2 is inserted from the main body 31 of the mother mold 3, and until the contact surface 21 </ b> A of the insert mold 2 is locked by the locking piece 32. The insertion mold 2 is fitted into the mother mold 3 by continuing the insertion. By this operation, the insert 22 penetrates into the molten steel Y, and a hole is formed in the bearing surface of the casting. Further, since the surface of the molten steel Y is solidified along the contact surface 21A of the nest 2, the bearing surface of the cast product is formed substantially along the contact surface 21A of the nest 2. You. Thereafter, as shown in FIG. 4 (c), the molten steel Y is cooled and cast as it is in a state where the nest 2 and the matrix 3 are fitted. Thus, a casting M having a shape as shown in FIG. 2 is formed. When a casting operation for forming the casting M is performed in such a procedure, burrs along the parting direction are likely to occur. Therefore, in this reference example , the part to be the parting direction is outside the casting M, and the parting direction D is substantially horizontal. Specifically, in the nest 2, the contact surface 21 </ b> A and the nest 22 are formed to be integral with each other, and 32 is brought into contact, and the direction along the outer peripheral portion of the contact surface 21A and the locking surface of the locking piece 32 of the mother die is the parting direction D. Therefore, even if burr B occurs,
It occurs on the side of the bearing surface of the casting, and does not occur around the hole H. Therefore, even when a process such as threading a bolt groove in the hole H is performed thereafter, the burr B does not hinder the processing operation, and there is no need to perform the trimming operation of the seat surface Z. However, the burrs B are removed by the matrix 3 when the matrix 3 is pulled out from the casting M without performing the trimming operation.
Is rarely left. In the embodiment of the reference example , the parting direction is configured to be substantially horizontal . Meanwhile, the figure
5 shows a side sectional view of the molding die according to the present invention. As shown in FIG. 5, the outer peripheral portion of the contact surface 21A 'of the nesting mold 2' is tapered so as to be lowered outwardly. 21A 'may be tapered so as to be fitted to the outer peripheral portion. In this case, since the parting direction is directed downward, burrs generated on the cast product are generated at a position lower than the seat surface, which is more preferable. Moreover, as compared with the above embodiment, when pulling out the mold 3, Ru advantage mower burr B is likely to more removed. As described above, according to the present invention, when a casting having a hole formed therein is formed by a mold, no burr is formed near the hole on the seating surface of the casting. Can be In particular, the direction in which the parting
Therefore, the burr generated on the cast product is more
It occurs at a lower position. Then pull the matrix 3
When removing, the burr B becomes easier to remove. Therefore, it is possible to eliminate the need for trimming work of burrs generated on the bearing surface of the casting.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 (a) is a side cross-sectional view of a molding die according to a reference example of the present invention, and FIG. 1 (b) is an insert in the molding die according to the reference example of the present invention. side cross-sectional view of the child type, (c), the participation of the present invention
It is a side sectional view of a mother die in a molding die concerning an example . FIG. 2 is a perspective view of a cast product cast by a molding die according to a reference example of the present invention. FIG. 3 is an enlarged view of a contact portion between a nesting die and a mother die in a molding die according to a reference example of the present invention. FIG. 4 is a process chart showing a procedure for manufacturing a casting using a molding die according to a reference example of the present invention. FIG. 5 is a side sectional view showing a molding die according to the present invention. FIG. 6 is a side sectional view showing a conventional molding die. FIG. 7 is a perspective view of a cast product cast using a conventional molding die. FIG. 8 is an enlarged view of a contact portion between a nesting die and a mother die in a conventional molding die. [Description of Signs] 1 Molding die 2 Nesting die 21 Body 21A Abutment surface 22 Nesting 3 Mother die 31 Main body 31A Inner peripheral surface 32 Locking piece M Casting product H Hole Z Seat surface D Parting direction B Bali

Continuation of the front page (72) Inventor Tsutomu Nakatani 1907, Hirata-cho, Suzuka-shi, Mie Honda Motor Co., Ltd. Suzuka Works (56) References JP-A-8-52531 (JP, A) JP-A-8-164442 ( JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B22C 9/06 B22D 17/22

Claims (1)

(57) [Claims 1] An insert mold provided with an insert for forming a hole in a bearing surface of a casting, and a mother mold into which the insert mold is fitted. A mold having an abutment surface that abuts a seating surface of the casting, and wherein the nest is formed integrally with the abutment surface.
Is the the outer periphery of the contact surface is tapered as fall outward
Is provided, said matrix is fitted in the tapered, entering-subtype locking piece for locking is provided and provided on an outer peripheral portion of the abutment surface of the entering-subtype The te
A molding die having a hole formed therein, wherein a direction along a locking surface between the surface of the paper and the locking piece of the matrix is a parting direction.