JP2006026732A - Casting method using pattern made of foamed polystyrene or the like - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To activate the industry by simplifying casting technology. <P>SOLUTION: To make a cast article, a pattern is necessary which is an original model of the cast article to be made. The pattern is called a wooden pattern, because it is made of wood. If the wooden pattern is made of synthetic resin, it is a resin pattern. In the casting technology, the cast article is manufactured by pouring metal into a casting mold which is molded using the pattern of the cast article made of a synthetic resin such as foamed polystyrene. Then, it does not require to remove the wooden pattern every time because the synthetic resin such as foamed polystyrene disappears when heated. The casting technology simplifies production of the cast article, eliminating necessity of removal of the original model, i.e. the resin pattern, of the cast article each time from the casting mold made of sand. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

Detailed Description of the Invention

Industrial application fields

  The present invention relates to a method for manufacturing various parts of a casting used in various machines directly connected to the current industry, and processing machines for producing such machines.

  Conventionally, various know-how has been talked about in casting technology. It is a metal melted drastically, so-called hot water, but its carbon content, impurities, casting temperature, type of sand forming sand mold, moisture content of sand during casting, etc. Although there is no limit to mention it, there has always been a wooden shape that was indispensable in casting.

  This wooden mold determines a metal object to be formed by casting, a so-called casting mold. That is, muddy metal melted by casting is poured into a sand mold formed by this wooden mold. After that, it naturally cools and hardens, and what is formed is a casting. This is of course the same type as the wooden pattern.

  Surround the wooden mold with sand, embed the wooden mold in the sand, build the sand mold, and take out the main wooden mold from the sand. Cast metal is made by pouring molten metal into the space in the sand, that is, the space after removing the wooden mold. It can be said that it is the most difficult task to remove the wooden mold from the sand in these series of operations.

  The entire area around the wooden mold is surrounded by sand and forms a sand mold. If this wooden mold is removed, the sand mold will be destroyed at that time and casting will not be possible. Therefore, the sand mold can be subdivided into upper, lower, middle, etc., and the wooden mold can be removed with the wooden mold almost fixed as a sand mold. For this reason, there are many split-type objects, but these are very difficult techniques, and require craftsmanship and skill.

Problems to be solved by the invention

  Aiming at casting without removing the wooden mold, changing the material of the wooden mold from wooden products to resin products eliminates the need for craftsmanship and skill, and achieves faster and more precise casting. It is an object.

Means for solving the problem

  In order to achieve the above object, the wooden material is changed from a conventional wooden product to a chemical product such as a synthetic resin. Preferable ones that melt easily to heat and have excellent pressure resistance, such as polystyrene foam

  Instead of using a wooden mold, a mold made of synthetic resin (hereinafter referred to as a resin mold) is surrounded by sand, and it is only necessary to create a gate in the resulting sand mold. The wood mold is removed one by one when the sand mold is made, but this resin mold does not need to be removed one by one. Therefore, it can be made precise without breaking the sand mold, and precise casting products can be made without the need to rely on craftsmanship or skilled workers.

Action

As shown in the above, since a series of operations become easy, combined with this, casting products can be easily made even for large parts, and the demand for such products is expected to increase further. .

1 is searched for and described in accordance with FIG. 1, but conventionally, it is a wooden shape, but in this drawing, a resin type is shown. Reference numeral 2 denotes a lower sand mold, and reference numeral 3 denotes an upper sand mold. These sand molds are called molds. 4 is a gate and is a hole into which the molten metal is poured. Reference numeral 5 denotes an air vent hole that allows molten metal to easily flow into the mold. Since this drawing is a perspective view, the resin mold can be seen but is not actually seen. In order to make a casting, when the molten metal is poured from the gate, the conventional wooden mold is removed so as not to obstruct the inflow of the metal, but in the resin mold, the inflowing metal is the resin mold by the heat. It will not interfere with the inflow of metal. Therefore, it is not necessary to remove this resin mold to the end, and it is possible to keep a tough sand mold and make a precise casting.

The invention's effect

The present invention has the following effects.
(1) Since the resin mold is not removed one by one, casting work becomes easy.
(2) Since the resin mold is inside, the sand mold is tough, and therefore a precise casting can be made.
(3) Better cast products can be made without the need for craftsmen or skilled workers.
(4) Since the shape is too complicated, it is possible to easily produce parts that cannot be made even if they are made by casting, which can greatly contribute to the activation of the industry.

  FIG. 3 is a perspective perspective view of a mold in which a resin mold is embedded in sand, a contour of the resin mold is created in the upper sand mold and the lower sand mold, and a casting can be made by pouring metal from the gate at any time.

Explanation of symbols

1. Resin mold 2. Lower sand mold 3. Upper sand mold Yuguchi 5. Air vent hole

Claims (2)

  Casting method and technology that does not make a sand mold using a conventional wooden mold in the casting method, but makes a mold using foamed polystyrene instead of the wooden mold   The casting method and technique according to claim 1, wherein other synthetic resin or the like that can be easily dissolved in heat is used in place of the wooden mold as in the case of the polystyrene foam.

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