JPS63188446A - Hardening method for ceramic mold for casting - Google Patents

Abstract

PURPOSE:To drastically shorten the time in dehydration and hardening and to form the mold of stabilized quality without any crack, etc., by dehydrating the moisture by inputting a ceramic mold into a dielectric heating furnace together with a model after molding the ceramic mold. CONSTITUTION:A ceramic mold 1 is subjected to molding by inputting the ceramic material of the type of making a water as a binder or forming water at hardening time into a model 2. And the mold 1 is charged into a dielectric heating furnace 5 together with the model 2 immediately after molding and subjected to dielectric heating by adding a radiowave of 10-15MHz to an electrode plate 6 from a high frequency power source 6 to harden with dehydration to the mold inner part. The dehydration hardening time can extremely be shortened therefore and the dehydration can completely be performed up to the inner part, so the generation of a crack and distortion on the mold 1 is reduced and the mold of stabilized quality can be formed because of its being not left in the atmospheric air.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for curing ceramic molds for casting.

[Conventional technology]

Conventionally, the curing method for manufacturing a ceramic mold for casting that uses water as a binder or generates water during the curing reaction has been performed using a model 2 as shown in FIG.
The ceramic material 1 is put into the mold and molded, and after the mold is removed, the ceramic mold 3 is left in the air for a long time to dehydrate to harden the surface, and then it is placed in a firing furnace 4 and heated and fired to harden the entire surface. I am making it so.

However, such a method has the following drawbacks.

(1) Conditions of leaving in the atmosphere (temperature, air temperature)
different.

) If left in the atmosphere insufficiently, cracks and distortions will occur in the ceramic mold during heating and firing.

(3) It takes several days to leave it unattended.

(4) Deformation occurs during cutting.

[Problem that the invention seeks to solve]

The present invention was proposed in view of these circumstances, and
Dehydration and curing time can be shortened, and cracks and distortions can be reduced.
An object of the present invention is to provide a method for curing a ceramic mold for casting, which can produce a ceramic mold of constant quality with less occurrence of deformation.

[Means for solving problems]

To this end, the present invention provides a method for producing a type of ceramic mold that uses water as a binder or generates water during a curing reaction. It is characterized by dehydrating.

[For production]

With the above-described configuration, it is possible to obtain a method for curing a ceramic mold for casting, which can significantly shorten the dehydration curing time and produce a ceramic mold of constant quality with less occurrence of cracks, distortion, deformation, etc.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram of an apparatus for carrying out the method of the present invention.

In the above diagram, a ceramic mold 1 made by using water as a binder or by putting liberal arts into a model 2 is immediately placed together with the model 2 into a dielectric heating furnace 5, and then heated from a high frequency power source 6 to an electrode plate 7 at 10 to 10. Radio waves of 15 MHz are applied and dielectric heating is performed to perform firing, and the interior of the ceramic mold 1 is dehydrated and hardened.

Therefore, according to this method, the ceramic mold 1 can be dehydrated and hardened in a short time, so there is no need to leave the ceramic mold 1 for a long time, and since the interior can be completely dehydrated, cracks and distortions in the ceramic mold 1 can be prevented during firing. Temperatures are low because there are few occurrences and there is no exposure to the atmosphere.

A ceramic mold 1 of constant quality can be manufactured regardless of natural conditions such as humidity.

〔Effect of the invention〕

In short, according to the present invention, in the production of a type of ceramic mold that uses water as a binder or generates water during a curing reaction, the ceramic mold is placed in a dielectric heating device together with the model after molding, and the moisture contained or the moisture generated by the reaction is placed. By dehydrating the material, dehydration and curing time can be greatly shortened, and cracks and distortions can be prevented.

INDUSTRIAL APPLICABILITY The present invention is extremely useful industrially because it provides a method for curing ceramic molds for casting that can produce ceramic molds of consistent quality with less occurrence of deformation.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an apparatus for carrying out an embodiment of the method for curing ceramic molds for casting according to the present invention, and FIG. 2 is an explanatory diagram of a conventional method. 1... Ceramic mold, 2... Model, 5...
Dielectric heating furnace, 6...high frequency power source, 7... electrode plate. Agent Masa Tsukamoto, Patent Attorney Figure 1 Figure 2

Claims (1)

[Claims] In the production of a type of ceramic mold that uses water as a binder or generates water during a curing reaction, the ceramic mold is placed in a dielectric heating device together with the model after molding, and the moisture contained or the moisture generated by the reaction is removed. A method for curing a ceramic mold for casting, characterized by dehydration.