JPS5950621B2 - Method for impregnating plaster mold for tire mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of impregnating a gypsum pattern for a tire mold with an impregnating liquid and curing the gypsum pattern for a tire mold.

Traditionally, the aluminum molds (tire molds) used to manufacture tires are made by carving various patterns into plaster, creating a mold from the plaster model with the patterns carved into it, and pouring aluminum hot water into the mold to form the tire mold. was manufacturing.

By the way, in order to engrave various patterns on plaster as mentioned above, soft plaster that is easy to engrave is used, but the soft plaster prototype on which these patterns are engraved is weak and its dimensions change over time. Therefore, it was unsuitable as a prototype for long-term storage.

Therefore, the soft plaster model engraved on such a surface must be inverted with rubber to make a mold, and then hard plaster is poured into the mold to restore it and create a hard preservation model, which requires an extra process. This was complicated and costly.

Therefore, in view of the current situation, the present invention involves placing a plaster model for a tire mold in a pot, evacuating the inside of the pot, and then injecting an impregnating liquid into the pot and pressurizing it with nitrogen gas. After discharging the impregnating solution under pressure, a cleaning solution is injected into a pot, and after washing the plaster model, the cleaning solution is discharged, and an anti-vaporization solution is injected into the pot and heated. By providing a method of impregnating a plaster model to harden the plaster model for a mold, unnecessary processes for preparing a plaster model for a tire mold can be eliminated, and the plaster model for a tire mold can be manufactured rationally and efficiently. It is.

An embodiment of the present invention will be explained below based on the drawings.

1 is a soft plaster model for a tire mold whose surface is engraved as shown in FIG.

This plaster model 1 is placed in a pot 2 as shown in FIG. 2, and the lid is closed.

Although the pot 2 is made of metal and has a rectangular cylinder shape, it is not necessarily limited to the cylindrical shape, and may also be cylindrical.

The pot 2 containing this plaster model 1 is vacuum-suctioned for about 30 minutes to bring the inside of the pot 2 into a vacuum state.

As shown in Fig. 3, the plaster model 1 is placed into the vacuum pot 2.
Inject impregnating liquid 3 for impregnating.

At this time, since the inside of the pot 2 is in a vacuum state, the impregnating liquid 3 can be smoothly poured into the pot 2.

Next, this impregnating liquid 3 is applied to the plaster model 1 as shown in FIG.
Nitrogen gas 6 was injected to make it easier to penetrate into the tank.
Pressure is applied at g/cm2.

The reason why nitrogen gas 6 is used is that the amount of the impregnating liquid volatilized is smaller than that of the plaster model 1 than air.

After approximately 45 minutes of pressurization time has elapsed, the impregnating liquid 3 is discharged from the pot 2 while still being pressurized as shown in FIG.

The impregnating liquid 3 is discharged from the pot, and in order to clean the surface of the plaster model 1 impregnated with the impregnating liquid under pressure, as shown in FIG. After cleaning, the cleaning liquid 4 is discharged into the pot 2.

Furthermore, as shown in FIG. 7, while the pressure is maintained, a volatilization prevention liquid 5 such as silicone oil is injected into the pot 2 to prevent volatilization of the impregnating liquid impregnated into the plaster model.

As this volatilization prevention liquid, silicone oil is most suitable because it does not interfere with the reaction of sugar beet, is difficult to impregnate into plaster, and is a highly viscous substance that can be easily post-treated.

The inside of the pot 2 filled with this volatilization prevention liquid is heated to 60°C as shown in FIG.
After slowly cooling the inside, as shown in Fig. 10, after discharging the volatilization prevention liquid 5 from the inside of the pot 2, the pressurized state is released and the plaster model 1 is taken out. When the prevention liquid is removed and the plaster model 1 is cleaned, the plaster model 1 is impregnated with a resin-made impregnating solution 2 to harden the plaster model.

The impregnation liquid used for curing this plaster model 1 is 100 parts by weight of methyl methacrylate, 10 to 200 parts by weight of 30% methyl methacrylate, 5 to 200 parts by weight of diphenylethane or methane, and peroxide. 0.05
It is composed of ~5.0 parts by weight and can prevent volatilization of the resin component from the surface of the plaster model and reduce shrinkage of the plaster model when it hardens.

As described above, according to the present invention, the plaster model for tire molding is impregnated with an impregnating liquid to harden the plaster model. There is no need to pour hard gypsum into a mold and restore it to create a hard gypsum model for preservation tire molds; simply impregnate the soft gypsum model for tire molds with impregnating liquid and the soft gypsum model for tire molds will harden. This eliminates the need for extra steps, saving cost and time.

In addition, we created a vacuum inside the pot, put the tire mold plaster model into the pot, injected the impregnating liquid into the pot, and then injected nitrogen gas and pressurized it, so the impregnating liquid was transferred to the tire mold plaster model. Can be easily penetrated.

Furthermore, since the surface of the tire mold plaster model is cleaned with a cleaning liquid, the surface of the tire mold plaster model does not get dirty, and scratches on the surface due to dirt removal do not occur. By injecting it into a pot and injecting it into a tire mold master mold, there is an advantage that the physical properties and quality of the surface of the tire mold gypsum master mold can be improved because volatilization does not occur from the surface of the tire mold gypsum master mold.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIGS. 1 to 10 are process diagrams for impregnating a plaster mold for a tire mold with an impregnating liquid according to the present invention. 1... Plaster model for tire mold, 2...
... Pot, 3 ... Impregnation liquid, 4 ... Washing liquid, 5 ... Volatization prevention liquid, 6 ... Nitrogen gas.

Claims (1)

[Claims] 1 Place a plaster model for a tire mold in a pot, make the pot vacuum, inject the impregnating liquid into the pot, leave it in vacuum, and then inject nitrogen gas into the pot. After pressurizing with gas and discharging the impregnating liquid while maintaining the pressurized state, a cleaning liquid is injected into the pot to wash the plaster model, the cleaning liquid is discharged, and a volatilization prevention liquid is injected into the pot. A method for impregnating a plaster mold for a tire mold, comprising curing the plaster mold for a tire mold by heating.