JPH02307648A - Method for washing wax pattern - Google Patents

Abstract

PURPOSE:To obtain high washing effect to releasing agent stuck to a wax pattern by primarily washing the wax pattern after releasing it from a mold with the specific composition of solvent and further secondarily washing the wax pattern. CONSTITUTION:The wax pattern sticking the releasing agent on surface is washed with a primary solvent composed of the following composition. The composition of the solvent is made to 20 - 60 vol.% aceton and/or trichloroethylene and the balance of single material or mixing material of lower alcohol having 1 - 3 C. After completing the primary washing, successively, the wax pattern is again washed with the single material or the mixing material of lower alcohol and after washing out the primary solvent stuck on the surface, the pattern is dried with hot blast and delivered to a mold forming process. Therefore, the high washing effect to the releasing agent stuck to the wax pattern is obtd., and peeling and cracking of binder caused by residue of the releasing agent are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field" The present invention relates to a cleaning method for removing mold release agent deposited on the surface of a wax model after mold release in wax molding.

``Prior Art'' - The wax-shaped property described in the article is as follows: Inject molten wax into a mold for forming a wax model, mold the wax model, and then insert the wax model into a wax shaft. A mold that encases the tree is created by repeatedly immersing the tree in binder slurry and sprinkling it with sand. moreover,
This method heats the casting mold (1) to dissolve the wax, and then pours molten metal into the remaining voids in the mold to obtain the product.

By the way, when molding the wax model, a mold release agent such as silicone emulsion or Kari soap is generally applied in advance into the mold, but this type of mold release agent inhibits the adhesion of the binder slurry in the next process. , remove as much as possible before making the mold.

Conventionally, the main cleaning method used is to immerse the wax model removed from the mold in cleaning water and perform ultrasonic cleaning.

``Problems to be Solved by the Invention'' However, in the ultrasonic cleaning method described in ``2'' (J, 516
(Because the occurrence of cavitation varies depending on the placement of the wax model and the adhesion state of the mold release agent, it is difficult to keep the cleaning conditions constant. There was a problem that the binder applied when making the mold would peel off or the binder layer would crack, resulting in problems such as deterioration of the yield of molded products.

Furthermore, since the cleaning effect is uneven, cleaning takes a relatively long time and has the disadvantage of low productivity.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cleaning method that has strong cleaning power and does not adversely affect wax models.

1. Means for Solving the Problems” Hereinafter, the wax model cleaning method according to the present invention will be specifically described.

In this method, first, a wax model with a mold release agent adhered to its surface is cleaned with a primary solvent having the following composition.

■ Acetone or/and trichloroethane: 20~
60vol% ■ A single substance or mixture of lower alcohols having 1 to 3 carbon atoms such as methyl alcohol, edyl alcohol, and propyl alcohol: The remaining content of acetone and/or trichloroethane is 2
If it is less than 0 vol %, the cleaning effect will be poor and the mold release agent may not be completely removed. On the other hand, 60vol%
If it exceeds this amount, the dissolving action will be too strong, and the surface of the wax model will be eroded into porous shapes, which may cause porous recesses to be formed on the surface of the molded product.

Furthermore, if an alcohol having 4 or more carbon atoms, such as butyl alcohol, is used, the problem arises that the cleaning power is reduced and that it takes a long time to evaporate due to slow volatilization. In addition,
There is no problem as long as a small amount of unavoidable impurities are mixed into each solvent.

Specific cleaning methods include spraying the primary solvent onto the wax model, filling a liquid tank with the primary solvent,
Possible methods include immersing a wax model in it. When immersing, it is desirable to mechanically stir the solvent or perform ultrasonic cleaning.

Further, it is desirable that the temperature condition of the secondary solvent is 22 to 27°C. If it is lower than 22°C, cleaning will not be sufficient, and if it is higher than 27°C, the solubility will increase and there is a risk of corroding the wax model. The above temperature conditions are also necessary to prevent dimensional changes in the wax model.

- After the next cleaning, the wax model is washed again with the above-mentioned lower alcohol alone or with a mixture of +', the primary solvent adhering to the surface is washed away, the wax model is dried with hot air, etc., and then handed over to the mold forming process. . -If the solvent remains on the surface of the wax model, it will not easily evaporate and will require additional work time.In addition, the release agent dissolved in the solvent will remain on the surface of the wax model and inhibit the adhesion of the binder. However, there is a risk of peeling or cracking.

"Example" Next, examples will be given to demonstrate the effects of the present invention.

Acetone, trichloroethane, and ethanol were mixed as shown in Table 1 to serve as a primary solvent, and the wax model was primarily cleaned. The wax model used was 150cm long and 75mm wide.
, was in the form of a plate with a thickness of 20 mm, and silicone emulsion was used as a mold release agent.

For cleaning, each two wax models were immersed in a 25Q primary solvent kept at 24° C. in a liquid bath, and then irradiated with ultrasonic waves at an output of 500 W for several seconds.

After the primary cleaning was completed, the wax model was pulled out of the solvent, immersed again in a liquid tank filled with ethanol, mechanically stirred, and then the secondary solvent was flowed out and the wax model was pulled up.

On the other hand, as Comparative Example 5, the same wax model was submerged in a cleaning tank filled with water and subjected to ultrasonic cleaning as in the conventional method. The ultrasonic power was 500 W, and the cleaning time was 30 seconds.

Then, after drying all these wax models with warm air,
The overall evaluation was determined by visually inspecting the surface condition to determine the degree of residual mold release agent and the presence or absence of corrosion on the surface of the wax model. The results are shown in Table 1.

(The following is a blank space) It is clear from the examples in Table 1 "Effects of the Invention - 1 et seq." ] A high fP effect is obtained after washing the applied mold release agent, preventing peeling and cracking of the bonding agent caused by residual mold release agent, and improving the yield of molded products. It is possible to do so.

In addition, since the cleaning effect is high, compared to the conventional method, the cleaning time can be shortened and the yield of wax models can be increased.

Claims (1)

[Claims] Acetone or/and trichloroethane 20-60
After first cleaning the wax model after release from the mold with a solvent consisting of a single substance or a mixture of lower alcohols with the remainder having 1 to 3 carbon atoms, the wax model is further washed with a single substance or a mixture of lower alcohols having 1 to 3 carbon atoms. A method for cleaning a wax model, which comprises the following steps: