JP2007152379A - Method for producing casting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a casting where a casting product having excellent corrosion resistance can be produced without applying a coating agent having corrosion resisting effect in the other stage. <P>SOLUTION: In the molding stage for a casting where molten metal is poured into dies and is molded, a releasing agent P2 applied or sprayed on dies 1a and 1b is mixed with a corrosion resisting agent P. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a casting manufacturing method, and more particularly to a casting manufacturing method having excellent corrosion resistance.

  Conventionally, as a method for producing a casting, a liquid metal (hereinafter referred to as a molten metal) is poured into a desired mold, and the liquid metal reaches a freezing point and solidifies to be molded along the mold.

  However, normally, the finished casting does not have any corrosion resistance, and the use of the casting product using the casting, for example, in the case of a diaphragm valve used for supplying the air for backwashing of a bag type dust collector, compressed air is used. After the supply, harmful gas (for example, HCl) in the dust collector passes through the pipe and reaches the diaphragm valve. The concentration increases as the water evaporates, and the portion where the gas adheres corrodes and needs to be replaced in a short period of time. In some cases, in the case of an expensive casting having a complicated structure, there arises a problem that the repair cost increases.

  For this reason, as a method of preventing corrosion, a method of applying a coating agent having a corrosion resistance effect to a corrosion target portion of a finished casting product is employed (see, for example, Patent Document 1).

However, in the method of applying a coating agent having a corrosion resistance effect to a cast product, it is necessary to provide a separate process after the cast product is completed, which is troublesome and the part that may corrode is complicated. In the case of the inside, there is a problem that the coating agent cannot be sufficiently applied.
Japanese Patent No. 2949767

  In view of the problems of the above-described conventional casting manufacturing method, the present invention provides a casting manufacturing method capable of manufacturing a casting product having excellent corrosion resistance without applying a coating agent having a corrosion resistance effect in a separate process. The purpose is to provide.

  In order to achieve the above object, the casting manufacturing method according to the first aspect of the present invention is a casting molding method in which a molten metal is poured into a mold, and a corrosion-resistant agent is mixed in a mold release agent applied or sprayed onto the mold. Features.

  In order to achieve the same object, the casting manufacturing method according to the second aspect of the invention is characterized by applying or spraying a corrosion-resistant agent after applying or spraying a mold release agent to a mold.

  According to the casting manufacturing method of the first aspect of the present invention, since the casting is molded by mixing the corrosion-resistant agent into the mold release agent applied to the mold, the corrosion-resistant agent permeates near the surface of the casting to be molded. It is possible to provide a method for producing a casting having a corrosion resistance effect on the entire casting product as a product.

  Further, according to the casting manufacturing method of the second invention, since the anticorrosive agent is applied or sprayed after the mold release agent is applied to the mold, the casting having the same effect as the casting manufacturing method of the first invention is obtained. A manufacturing method can be provided.

  Embodiments of a method for producing a casting according to the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of a method for producing a casting according to the present invention.
This casting manufacturing method uses a mold 1a to be a female mold whose surface is formed into a desired shape, a male mold 1b corresponding to the female mold, and a core (not shown) as required. After pouring in a space formed between 1a and the mold 1b and solidifying, the mold 1a and the mold 1b are separated and the casting W is taken out.

  And in the manufacturing method of the casting of this invention, the anti-corrosion agent mixing release agent P1 which mixed the coating agent with a corrosion resistance into the release agent apply | coated or sprayed on the surface of the casting_mold | template 1a and the casting_mold | template 1b is used. Thus, a release agent coating S having a corrosion resistance effect is formed on the surfaces of the mold 1a and the mold 1b. Then, the mold 1a and the mold 1b are fixed at a predetermined interval, and the molten metal is poured into a space formed between the mold 1a and the mold 1b from a pouring port (not shown), and after the molten metal has solidified, the mold 1a and the mold 1 1b is separated. The casting W thus taken out has a corrosion-resistant surface due to the effect of a release agent having a corrosion-resistant effect formed on the surfaces of the molds 1a and 1b.

FIG. 2 shows a second embodiment of the casting manufacturing method of the present invention.
In this casting manufacturing method, a mold release agent P2 is first applied or sprayed on the surfaces of the mold 1a and the mold 1b, and then a coating agent (corrosion resistant) P3 having a corrosion resistance is applied to the surfaces of the mold 1a and the mold 1b. I try to spray. Then, after spraying the coating agent P3 having the corrosion resistance effect, as in the first embodiment, the molten metal is poured into the space formed between the mold 1a and the mold 1b, and after the molten metal is solidified, the mold 1a and the mold 1b are poured. Separate the castings W and take out the casting W.

  In the second embodiment, it is possible to prevent the corrosion resistance P3 from being dissolved in the release agent P2 and reducing the original corrosion resistance.

  As mentioned above, although the manufacturing method of the casting of this invention was demonstrated based on the some Example, this invention is not limited to the structure described in the said Example, In the range which does not deviate from the meaning, especially inside. In the mold using the core, the structure can be appropriately changed, for example, by applying or spraying a release agent having a corrosion resistance effect to the core.

  The casting production method of the present invention has a characteristic that a casting having a corrosion resistance effect on the surface can be produced by molding a casting by mixing a normally used release agent with a coating agent having a corrosion resistance effect. Therefore, it can be suitably used for the production of a casting product that may be oxidized or corroded, particularly for applications applied to a diaphragm valve used in a bag type dust collector.

It is explanatory drawing which shows 1st Example of the manufacturing method of the casting of this invention, (a) is the spraying procedure of a corrosion-resistant mixing release agent, (b) is the state which poured the liquid metal, (c) ) Indicates the finished casting. It is explanatory drawing which shows 2nd Example of the manufacturing method of the casting of this invention, (a) shows the spraying method of a mold release agent, (b) shows the spraying method of a corrosion-resistant agent.

Explanation of symbols

1 Mold 2 Liquid metal P1 Corrosive release agent P2 Release agent P3 Corrosion agent W Casting

Claims (2)

  In a casting molding method in which a molten metal is poured into a mold and molded, a corrosion-resistant agent is mixed in a mold release agent applied or sprayed onto the mold.   In a casting molding method in which molten metal is poured into a mold and molded, a casting manufacturing method characterized by applying or spraying a corrosion resistance agent after applying or spraying a mold release agent to the mold.

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