Casting mold forming apparatus and metal mold unit for use therein

Abstract

This invention relates to an apparatus for molding a mold by pressurizing a foam mixture composed of particles of aggregate, water-soluble binders, and water, and injecting it into a cavity of a heated metal mold. This invention provides an apparatus which can use a foam mixture effectively, can fill the cavity of the metal mold with enough of a foam mixture, and can shorten the time to harden the foam mixture. To achieve these effects, the apparatus for molding a mold is comprised of a hollow rectangular-parallelepiped body 12 having a bottom plate 14, the bottom plate 14 having an injection hole 13 to inject the foam mixture, a means 10 for containing the foam mixture having functions as a mixing bath to mix particles of aggregate, water-soluble binders, and water, and as a pressurized vessel to inject the foam mixture into a metal mold, and a means 22 for closing and opening the injection hole 13. The apparatus is further provided with any means or any combination of means for measuring a temperature of the particles of aggregate or the foam mixture, viscosity of the foam mixture, and moisture of the foam mixture. Further, the means 103 for communicating gases from the cavity of the metal mold to the outside of the mold so that the particles of aggregate cannot pass through it is disposed in the metal mold.

Description

technical field [0001] The present invention relates to a casting mold molding device which presses and fills the foamed mixture obtained by mixing granular aggregate, water-soluble binder and water into the cavity of a heated metal mold to shape the casting mold and the metal used thereon. Mold device. Background technique [0002] In recent years, since it is easier to disassemble after casting, more granular aggregate binders are used as water-soluble binders, and the water-soluble binders are hardened by evaporation of water during heating to shape the casting mold. [0003] A mold molding device used for this kind of mold molding includes: a cylinder extending up and down, a plunger that can move up and down in the cylinder, a gate that can open and close the opening at the lower end of the cylinder, and the above components All of them are liftable and jointly constitute a pressing device, which presses the fluid sand into the metal mould. And the opening provided in...

AI Technical Summary

Problems solved by technology

[0005] In the existing mold molding device of this kind of composition, the fluidized sand dropped into the cylinder cannot change well with the volume change of the metal mold cavity, so it is necessary to put more fluid sand into the cylinder than the cavity. volume fraction of fluid sand, but the fluid sand remains in the cylinder after being pressed into the cavity, and the residual fluid sand is discarded. Therefore, there is a waste of fluid sand

At the same time, there is also the problem that the fluid sand in the cavity cannot be fully filled

[0006] Since the foaming mixture of such a casting material using a water-soluble binder as a binder contains a lot of water, there is a problem that it will take a long time to harden in the metal mold device

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