JP2003290870A - Method for utilizing regenerated molding sand - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for utilizing regenerated molding sand which attains cost reduction and environment protection by re-utilizing the sand removed by shot-blasting. <P>SOLUTION: In the method for regenerating the molding sand after shaking out a casting from a mold, the sand S removed from the casting A by the shot-blasting 1 is introduced into a magnetic separator 4 and the sand having the magnetic component removed by this magnetic separator 4 is recovered into a sand recovering part 5 and utilized as the regenerated sand S1 while the magnetic component is recovered into a magnetic component recovering part 6. To the above regenerating process, a fine powder removing process for removing the fine powder from the regenerated sand S1 is added. The above regenerated sand S1 and green sand are mixed at a prescribed ratio and the resultant mixture is utilized as the sand for forming the mold. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recycling foundry sand, and more particularly to reusing sand after shot blasting.

[0002]

2. Description of the Related Art Conventionally, in the manufacture of castings, mold sand adheres to the casting surface of the cast product after the mold is removed. Therefore, the adhered sand is removed by shot blasting to clean the casting surface. The product.

[0003]

By the way, the sand removed by shot blasting as described above is disposed of as industrial waste for a fee. This processing cost is soaring year by year, it has a great impact on corporate profits, and securing a disposal site is difficult from the viewpoint of environmental protection.

The present invention has been made in view of the above problems. An object of the present invention is to reduce the cost and the environment by reusing the sand removed by shot blasting so that it can be reused. It is an object of the present invention to provide a method for recycling foundry sand that can be protected.

[0005]

The method for recycling foundry sand of the invention according to claim 1 is a method for reclaiming foundry sand after demolding, in which the sand removed from the foundry by shot blasting is applied to a magnetic separator. It is characterized in that the sand from which magnetic components have been removed by this magnetic separator is used as recycled sand.

The method for recycling foundry sand of the invention according to claim 2 is the method for recycling foundry sand according to claim 1,
It is characterized in that a fine powder removing step for removing fine powder from the sand is added.

The method for reclaiming foundry sand according to a third aspect of the invention is characterized in that the reclaimed sand is used as at least a part of the sand forming the mold.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an outline of a recycling apparatus for carrying out the method for recycling foundry sand of the present invention.

In FIG. 1, 1 is a shot blast,
The shot blast 1 is equipment for removing sand adhering to the casting surface of a casting after the mold is removed. That is,
Even after removing the casting from the mold and dropping the sand with a sand blasting machine, since the sand still adheres to the casting surface of the casting, the attached sand should be removed cleanly by shot blasting 1. A casting product is made by cleaning the surface of the casting surface. The shot blast 1 has a hanger type,
There are many types such as tumbler type, table type, barrel type and ram cage type.

Reference numeral 2 denotes a supply device for supplying the shot blast 1 with the casting A having sand adhered to the casting surface after the mold release,
The casting A supplied into the shot blast 1 by the supply device 2 is carried out of the machine from a carry-out section (not shown) after sand is removed from the casting surface by the shot blast 1.

On the other hand, the sand S removed from the casting surface by the shot blasting 1 is introduced into the external magnetic separator 4 by the introducing device 3 through, for example, the upper discharging portion 11.

The magnetic separator 4 is for separating magnetic components (iron components of castings) from the sand S, and the sand S from which the magnetic components have been removed.
1 is recovered by the sand recovery unit 5 provided below, and the magnetic component is recovered by the magnetic content recovery unit 6 also provided below. The sand thus recovered is used as recycled sand S1. . As a specific embodiment, for example, the reclaimed sand S1 and the raw sand are mixed at a predetermined ratio and mixed into a molding line, and the mixture is used for manufacturing cores, main molds, and the like that form a mold. Particularly, it is preferably used for producing a self-hardening type core. It is also possible to manufacture a core or the like by using 100% of the recycled sand S1.

That is, the sand removed from the casting surface by the shot blast 1 is subjected to a treatment similar to a so-called roasting treatment by the projection action of the abrasive material such as shot by the impeller in the shot blast 1. This is because the magnetic component is removed from it, so that it has a function to be sufficiently utilized as reclaimed sand.

Further, by adding a fine powder removing step for removing fine powder in the sand to the above-mentioned regenerating step, it is possible to obtain regenerated sand S1 of higher quality. This step may be carried out simultaneously with the separation of the magnetic component by the magnetic separator 4 by incorporating a blower into the magnetic separator 4, or the fine powder may be separately removed from the regenerated sand S1 from which the magnetic component has been separated.

By separating the magnetic component from the sand removed from the casting and reusing it as the reclaimed sand S1 as described above, the sand which has been conventionally disposed of can be effectively reused.
The cost can be reduced and the environment can be protected.

The magnetic component recovered by the magnetic component recovery unit 6 can be discarded or reused as a weight member. By reusing this magnetic component also as a weight member, the sand S Waste can be eliminated, and further cost reduction and environmental protection can be achieved.

[0018]

As described above, the shot blasting machine has a function of removing foundry sand and at the same time cleaning the sand itself. Focusing on that, we decided to make it more reusable. According to the method for recycling foundry sand of the present invention, by separating the magnetic components from the sand removed from the foundry and reusing it as recycled sand, it is possible to effectively reuse the sand that was conventionally disposed of. The cost can be reduced and the environment can be protected.

Further, by adding a fine powder removing step for removing fine powder in the recycled sand to be recycled, it is possible to obtain recycled sand of higher quality.

[Brief description of drawings]

FIG. 1 is a schematic view showing a recycling apparatus for carrying out a method for recycling foundry sand according to the present invention.

[Explanation of symbols]

1 shot blast 4 magnetic separator 5 Sand Recovery Department S1 recycled sand

Claims (3)

[Claims] 1. A method for reclaiming foundry sand after demolding, wherein the sand removed from the casting by shot blasting is applied to a magnetic separator, and the sand from which magnetic components have been removed by this magnetic separator is used as reclaimed sand. How to recycle foundry sand. 2. The method for recycling foundry sand according to claim 1, wherein a fine powder removing step of removing fine particles from the sand is added. 3. The method for reusing foundry sand according to claim 1, wherein the reclaimed sand is used as at least a part of the sand forming the mold.