JP2004050201A - Method and facility for regenerating metallic mold for casting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for regenerating a metallic mold for casting with which the consumption of green sand is reduced as much as possible and the management of molding sand is very easy. <P>SOLUTION: This method is characterized in that it includes: a process for taking out a cast material from the metallic mold after casting the cast material by using the metallic mold having a coating layer on a gas hardening molding sand on a product cavity surface and a gas venting mechanism; a process for performing the regenerating treatment of the exfoliated coating layer by exfoliating the coating layer from the metallic mold, into the gas-hardening molding sand; and a process for forming the coating layer of the gas hardening molding sand in the product cavity by using the regenerated gas hardening molding sand. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for regenerating the coating layer in a mold having a coating layer of gas-curable foundry sand and a ventilation mechanism on the surface of a product cavity, and a facility therefor.
[0002]
[Prior art and problems]
Conventionally, green molds using only green sand are the mainstream as casting molds, and large amounts of green sand that cannot be reused and are discarded will be generated. Disposal becomes increasingly difficult from the viewpoint of environmental problems and also becomes a social problem. In addition, cores and the like molded using shell sand and self-hardening sand are collected together with the raw sand after pouring, subsequently taken out of the raw sand and collected, separately regenerated by a specialized trader, and then cast. It has come to be used again as sand, so that there has been a problem that the management of foundry sand is very troublesome.
[0003]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method and a facility for regenerating a casting mold in which the amount of foundry sand used is reduced as much as possible, and the management of foundry sand becomes very easy. To provide.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, a method for reclaiming a casting mold according to claim 1 is a method for regenerating the coating layer in a mold having a coating layer of gas-curable molding sand and a ventilation mechanism on a product cavity surface. A step of casting the casting using a mold having a coating layer of gas-curable molding sand and a ventilation mechanism on the product cavity surface, and then removing the cast casting from the mold; and A step of regenerating the peeled coating layer into the gas-curable molding sand, and a step of forming a coating layer of gas-curable molding sand on the product cavity surface using the regenerated gas-curable molding sand. And characterized in that:
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
In the present invention, by using gas-curable molding sand as the coating layer, it is possible to prevent the mold from being deformed due to heating generated in the case of shell sand.
[0006]
【Example】
Hereinafter, a method for regenerating a casting mold according to the present invention will be described in detail with reference to FIGS. As shown in FIG. 1, the present invention casts a casting using a mold having a coating layer of gas-curable molding sand and a ventilation mechanism on the product cavity surface, and then removes the cast casting from the mold. Subsequently, the coating layer is peeled off from the mold and the peeled coating layer is regenerated into the gas-curable molding sand, and then the gas-curable molding sand is applied to the product cavity surface using the regenerated gas-curing molding sand. A coating layer of foundry sand is formed.
[0007]
Then, the coating layer is formed as shown in FIGS. That is, as shown in FIG. 2A, a ventilation hole or vent having a product cavity surface 1 having dimensions substantially similar to the outer shape of the product and communicating with a hollow chamber 2 formed on the back surface of the product cavity surface 1. The two mother bodies 4.4 having the plug 3 provided on the product cavity surface 1 are disposed so as to face each other with the product model 5 interposed therebetween. Then, as shown in FIG. 4 together define a space 6 which is the distance between the mother body 4.4 and the product model 5 or the match plate and extends substantially along the product cavity surface 1.1.
[0008]
Next, as shown in FIG. 3A, a gas-curable casting as a raw material of a molding sand coating layer for covering the product cavity surface 1 of the base body 4 by suction by reduced pressure in the space 6 or blowing by compressed air. After the sand 7 is filled in the space 6, a hardening gas is allowed to flow through the gas-curable molding sand 7 to harden the gas-curable molding sand 7, and then, as shown in FIG. With the post-cured foundry sand 7 adhered to the base 4, the two bases 4 are separated from the product model 5 and separated from each other. Thereby, a desired mold 8 can be obtained. The same applies to not only gas-curable molding sand but also self-hardening molding sand.
[0009]
【The invention's effect】
As is apparent from the above description, the invention of claim 1 is a method for regenerating the coating layer in a mold having a coating layer of gas-curable molding sand and a ventilation mechanism on the surface of the product cavity. After casting a casting using a mold having a coating layer of gas-curable molding sand and a ventilation mechanism on the surface, a step of taking out the cast casting from the mold, and peeling off the coating layer from the mold. The method includes a step of regenerating the coating layer into the gas-curable molding sand, and a step of forming a coating layer of the gas-curable molding sand on the product cavity surface using the regenerated gas-curable molding sand. Since the majority of the mold is composed of a mold, the amount of foundry sand used is very small, the amount of foundry sand discarded is extremely small, and the management of foundry sand is also very easy. Causes heat distortion in the mold It exhibits an excellent practical effect of such never to benefit.
[Brief description of the drawings]
FIG. 1 is a flowchart showing an embodiment of the present invention.
FIG. 2 is a longitudinal section for explaining the procedure of one embodiment of the present invention, wherein a shows the relationship between two mother bodies and a product model, and b shows a relationship between the two mother bodies and a product model. Shows the space created.
FIG. 3 is a longitudinal sectional view for explaining the procedure of one embodiment of the present invention, wherein a shows a state in which molding sand is filled in a space defined by two mother bodies and a product model; Denotes a base body in which the surface of the product cavity is covered with a coating layer made of foundry sand.
[Explanation of symbols]
1 Product cavity surface 4 Base 7 Gas-curable molding sand 8 Mold

Claims (2)

A method for regenerating the coating layer in a mold having a coating layer of gas-curable molding sand and a ventilation mechanism on a product cavity surface,
After casting a casting using a mold having a coating layer of gas-curable foundry sand and a ventilation mechanism on the product cavity surface, removing the cast casting from the mold,
A step of regenerating the coating layer from which the coating layer has been separated and peeled off from the mold to the gas-curable molding sand,
Forming a coating layer of gas-curable molding sand on the surface of the product cavity using the recycled gas-curable molding sand,
A method for regenerating a casting mold, comprising: Equipment for regenerating the coating layer in a mold having a coating layer of gas-curable molding sand and a ventilation mechanism on a product cavity surface,
Coating layer peeling means for peeling the coating layer from the mold from which the casting was removed after casting of the casting,
A regeneration treatment means for regenerating the peeled coating layer into the gas-curable molding sand,
Coating layer forming means for forming a coating layer on the product cavity surface using gas-curable molding sand regenerated by the regenerating means,
Recycling equipment for casting dies, comprising:

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