JP2005021962A - Manufacturing method for mold, mold, and casting obtained thereby - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a mold for molding a casting with no burr generated. <P>SOLUTION: The manufacturing method for the mold includes the following processes: a process wherein a product-cavity with a designated dimension similarly larger than the dimension of a cast product is formed by combining two or more metallic molds having product-cavities with designated dimensions similarly larger than the dimension of the cast product; a process where the surface of the formed product cavity is coated with an adhesive; a process wherein a proper quantity of heat-resistant granules free from a binder is put into the product-cavity coated with the adhesive; a process wherein, by three-dimensionally moving the two or more metallic molds into which the heat-resistant granules are put, the heat-resistant granules are stuck to the surface of the product-cavity with a binder to coat the surface with the granules, so that the product-cavity is formed to have the approximately designated dimension; and a process wherein disused heat-resistant granules, which are not stuck to the surface of the product-cavity, are removed from inside the cavity. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a method for manufacturing a mold for casting a casting that does not generate flash, the mold, and the casting.

In general, casting molds for castings need not be shown in the document, and since long ago, whether they were sand molds or molds, a plurality of molds can be taken out from the molds after the cast molten metal has solidified. It has been constituted by what is divided into individual mold pieces.

However, as in the prior art, a casting in which a molten metal is poured into a product cavity formed by combining two or more molds and cast, there is a problem that a so-called flash is inevitably generated at a portion where the molds are combined with each other, that is, at a division position. there were.

This invention is made | formed in view of said situation, The objective is to provide the method of manufacturing the casting_mold | template for casting the casting which does not generate | occur | produce a flash, the casting_mold | template, and the casting.

  In order to achieve the above object, the mold manufacturing method according to the present invention is a method for manufacturing a mold for casting a casting that does not generate burrs, and has two product cavities that are similar in size to the casting product by a predetermined size. A step of defining a product cavity having a size that is similar in size to a casting product by combining the above dies, a step of applying an adhesive to the surface of the defined product cavity, and the product cavity having an adhesive applied thereto A step of adding an appropriate amount of heat-resistant granular material not containing a binder therein, and three-dimensionally changing the two or more molds charged with the heat-resistant granular material, A process for forming a product cavity having a substantially predetermined size while covering the surface of the product cavity with the heat-resistant powder particle by attaching the heat-resistant powder particle to the surface with the binder. When, characterized in that it comprises a step of removing the unnecessary heat resistance granular material that does not adhere to the product cavity surface from the product cavity.

As is apparent from the above description, the present invention is a method of manufacturing a mold for casting a casting that does not generate flash, and has two or more molds having product cavities that are similar in size to the casting product. Forming a product cavity having a size similar to that of a cast product, applying an adhesive to the surface of the defined product cavity, and caking into the product cavity to which the adhesive has been applied. An appropriate amount of heat-resistant granular material not containing an agent, and three-dimensionally changing the two or more molds charged with the heat-resistant granular material, thereby causing the viscosity of the product cavity surface to vary. Attaching the heat-resistant powder particles with a binder to cover the surface of the product cavity with the heat-resistant powder particles and forming a product cavity having a substantially predetermined size; Removing unnecessary heat-resistant powder particles that do not adhere to the product cavity surface from the inside of the tee, so that when the mold manufactured according to the present invention is used, the alignment position of the mold does not become obvious, and thus flash occurs. It has excellent practical effects such as being able to cast a casting that is not easily and reliably performed.

In the present invention, the heat-resistant granular material refers to a material such as Cerabeads, mullite-based artificial sand, dredged sand, or chromite sand.
In the present invention, the adhesive refers to an adhesive that cures at a predetermined temperature, such as isocyanate used in the cold box method, water glass used in the CO ₂ mold making method, starch, and protein.

In the present invention, the three-dimensional variation means that the mold is reversed, forwardly rotated, vibrated, shaken back and forth, left and right, obliquely up and down, and pressurized.

In addition, as a method of removing unnecessary heat-resistant powder particles in the present invention, the heat-resistant powder particles are tilted so that the inlet (pouring port) into the product cavity is down or sucked out by a suction means. There is something to do.

Further, in the present invention, the heat-resistant granular material covering the surface of the product cavity is adhered by an adhesive so that the particles are uniformly packed on the surface of the product cavity, and the adhered state is 1 It is basically a layered state, but after applying an adhesive to the one-layered heat-resistant granular material covering the surface of the product cavity, the heat-resistant granular material is adhered in the same manner, and if necessary Further, this process may be repeated to constitute the heat-resistant granular material in two or more layers. Thereby, it is possible to prevent the molten metal from being rapidly cooled and cope with inhibition of chilling of the product.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, two molds 1 and 2 having product cavities that are similar in size to the casting product are prepared, and then, as shown in FIG. 2 together define a product cavity 3 that is similar in size to the casting product by a predetermined dimension. Next, as shown in FIG. 3, starch 4 is applied as an adhesive to the surface of the defined product cavity 3, and subsequently, as shown in FIG. A predetermined amount of cinnabar sand 5 as a heat-resistant granular material containing no agent is added.

Next, as shown in FIG. 5, the two molds 1, 2 charged with the cinnabar 5 are shaken in the vertical direction so that the surface of the product cavity 3 is uniformly packed, and the cinnabar 5 is adhered by the starch 4. Then, the surface of the product cavity 3 is covered with a single layer of cinnabar particle layer 6 composed of cinnabar particles, and a product cavity 7 having almost a predetermined size is formed, and then, as shown in FIG. 1 and 2 are inverted 180 degrees, and unnecessary dredged sand 5 that does not adhere to the product cavity surface is discharged from the product cavity 7. Next, as shown in FIG. 7, the two molds 1 and 2 are rotated forward by 180 degrees and returned to the original state, and then molten metal is injected into the product cavity 7, and subsequently, as shown in FIG. 8, Open the two molds 1 and 2 separately in the left-right direction. Thereby, the casting product 8 can be taken out.

It is a longitudinal cross-sectional view of the metal mold | die for implementing one Example of this invention. It is explanatory drawing for demonstrating operation | movement of one Example of this invention. It is explanatory drawing for demonstrating operation | movement of one Example of this invention. It is explanatory drawing for demonstrating operation | movement of one Example of this invention. It is explanatory drawing for demonstrating operation | movement of one Example of this invention. It is explanatory drawing for demonstrating operation | movement of one Example of this invention. It is explanatory drawing for demonstrating operation | movement of one Example of this invention. It is explanatory drawing for demonstrating operation | movement of one Example of this invention.

Explanation of symbols

1; 2 Mold 3; 7 Product cavity 4 Starch 5 Sand sand 6 Sand sand particle layer

Claims (5)

A method for producing a mold for casting a casting that does not generate burrs,
Combining two or more molds having product cavities that are similar in size to the casting product to define a product cavity that is similar in size to the casting product;
Applying an adhesive to the surface of the defined product cavity;
A step of adding an appropriate amount of heat-resistant granular material not containing a binder in the product cavity to which the adhesive is applied;
By three-dimensionally changing the two or more molds charged with the heat-resistant powder particles, the heat-resistant powder particles are adhered to the surface of the product cavity by the binder, and the product cavity Covering the surface with the heat-resistant powder and forming a product cavity having a predetermined size; and
Removing unnecessary heat-resistant powder particles that do not adhere to the product cavity surface from within the product cavity;
A mold manufacturing method comprising: In the mold manufacturing method according to claim 1,
A mold manufacturing method, wherein the heat-resistant powder particles covering the surface of the product cavity are formed into two or more layers corresponding to prevention of chilling of the product. A mold for casting a casting that does not generate burrs,
Two or more molds having product cavities that are similar in size to the casting product and that are combined with each other to define product cavities that are similar in size to the casting product;
A heat-resistant powder particle that is adhered to the surface of the product cavity defined by the two or more molds that are combined with each other to cover the surface of the product cavity and constitutes a product cavity having a substantially predetermined size. Body,
A mold characterized by comprising. The mold according to claim 3,
2. The mold according to claim 1, wherein the heat-resistant powder particles covering the surface of the product cavity are formed into two or more layers corresponding to prevention of chilling of the product. A casting formed by a split mold in which the surface of a product cavity defined by two or more molds matched to each other is covered with a heat-resistant powder,
Casting characterized by no flash on the surface.