Sheet molding device

A sheet molding device contains: a base, a mold, and at least one spray nozzle. The base includes a forming zone and a removing zone. The mold includes a molding part, an insolation washer, and a sealing part. The molding part has a peripheral rib, a die cavity, and a first heater. The insolation washer has a melting point higher a sheet, and the insolation washer is connected with a top surface of the peripheral rib and its top surface is higher than the peripheral rib. The sealing part has an outlet connecting with a high-pressure gas supply unit via an air pipe and has a second heater. The molding part and the sealing part are connected together in the forming zone, and after blow molding the sheet, the sealing part is moved toward the removing zone. Furthermore, the at least one spray nozzle is arranged in the removing zone.

FIELD OF THE INVENTION

The present invention relates to a sheet molding device which cools and removes a sheet quickly.

BACKGROUND OF THE INVENTION

A conventional sheet molding device is disclosed in TW M447804 to mold a metal sheet, and after molding the metal sheet, a molding part and the metal sheet are moved into a cooling groove, such that temperatures of the molding part and the metal sheet are reduced to cool and remove the metal sheet. However, such a cooling and removing process takes a long time.

In addition, the metal sheet is placed on a top surface of the molding part, and the molding part and a sealing part clamp the metal sheet so that the metal sheet is heated and blow molded. Unfortunately, the metal sheet is melted easily, because a high temperature occurs and the molding part and the sealing part clamp the metal sheet forcefully, so the melted metal sheet penetrates into orifices on the top surface of the molding part, and the metal sheet adheres with the molding part securely and cannot be removed.

SUMMARY OF THE INVENTION

The primary object of the present invention is to provide a sheet molding device which cools and removes a sheet quickly.

To obtain the above objects, a sheet molding device provided by the present invention contains: a base, a mold, and at least one spray nozzle.

The base includes a forming zone and a removing zone.

The mold includes a molding part, an insolation washer, and a sealing part. The molding part has a peripheral rib arranged on a top surface thereof, a die cavity defined inside the peripheral rib, and a first heater disposed on a bottom surface thereof to heat the molding part. The insolation washer is formed in a ring shape and its melting point is higher a sheet, wherein the insolation washer is connected with a top surface of the peripheral rib and its top surface is higher than that of the peripheral rib to accommodate the sheet, the sealing part has an outlet defined therein and connecting with a high-pressure gas supply unit via an air pipe, wherein the sealing part has a second heater mounted on a top surface thereof to heat the sealing part, the molding part and the sealing part are connected together in the forming zone, and after blow molding the sheet, the sealing part is moved toward the removing zone.

The at least one spray nozzle is arranged in the removing zone to spray cooling substances toward the sheet on the molding part.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

With reference toFIGS. 1 to 4, a sheet molding device according to a preferred embodiment of the present invention comprises: a base10, a mold20, and at least one spray nozzle30.

The base10includes a forming zone11and a removing zone12.

The mold20includes a molding part21, an insolation washer22, and a sealing part23. The molding part21has a peripheral rib210arranged on a top surface thereof, a die cavity211defined inside the peripheral rib210, and a surrounding groove212formed on a top of the peripheral rib210. The molding part21also has a first heater213disposed on a bottom surface thereof to heat the molding part21. The insolation washer22is formed in a ring shape and its melting point is higher than the sheet40. For example, when the sheet40is made of aluminum, the insolation washer22is made of stainless steel or copper; and when the sheet40is made of rubber or plastic, the insolation washer22is made of aluminum. A lower portion of the insolation washer22is retained with the surrounding groove212of the peripheral rib210, and when the insolation washer22is retained with the surrounding groove212, a top surface of the insolation washer22is higher than that of the peripheral rib210to accommodate the sheet40. The sealing part23has an outlet230defined therein and connecting with a high-pressure gas supply unit (not shown) via an air pipe231. The high-pressure gas supply unit supplies high-pressure gas and sprays the high-pressure gas out of the outlet230through the air pipe231. The sealing part23has a second heater232mounted on a top surface thereof to heat the sealing part23. The molding part21and the sealing part23are connected together in the forming zone11, such that a bottom surface of the sealing part23presses the sheet40on the top surface of the insolation washer22to blow mold the sheet40. After blow molding the sheet40, the sealing part23is moved toward the removing zone12. In this embodiment, each of the first heater213and the second heater232is an electric heating tube or a high frequency heater.

The at least one spray nozzle30is arranged in the removing zone12to spray cooling substances, such as, gas, coolant or cooling mist toward the sheet40on the molding part21, thus cooling and releasing the sheet40quickly. In this embodiment, a number of the at least one spray nozzle30is any one of two, three, and four.

Referring toFIGS. 4 to 7, in operation, the insolation washer22is retained with the surrounding groove212(as shown inFIGS. 2 and 3), and the sheet40is placed on the top surface of the insolation washer22to cover the die cavity211(as illustrated inFIG. 4), then the molding part21is connected with the sealing part23in the forming zone11and is pressed to contact with the sheet40(as shown inFIG. 1), thereafter the first heater213and the second heater232heat the molding part21and the sealing part23to shape the sheet40easily. The high-pressure gas supply unit inputs the high-pressure gas from the outlet230to the sheet40via the air pipe231, such that the sheet40contacts with the die cavity211(as shown inFIG. 5) matingly. Thereafter, a pressure in the high-pressure gas supply unit is released, and the molding part21is removed from the sealing part23, then the molding part21and the sheet40are moved into the removing zone12so that the at least one spray nozzle30sprays the gas, the liquid or the cooling fluid toward the sheet40on the molding part21, thus cooling and releasing the sheet40quickly (as illustrated inFIG. 6). Thereafter, the sheet40and the insolation washer22are removed from the molding part21(as shown inFIG. 7), and the sheet40is trimmed to obtain a finished sheet product.

Because the at least one spray nozzle30sprays the gas, the liquid or the cooling fluid toward the sheet40on the molding part21, the sheet40is cooled and released quickly, and a temperature of the molding part21is not lowered greatly so that the molding part21is heated quickly, hence the sheet40does not adhere on the molding part21by ways of the insolation washer22. Since the melting point of the insolation washer22is higher than that of the sheet40, the isolation washer22does not adhere on the molding part22, thus removing the sheet40and the isolation washer22from the molding part21easily. Preferably, after the sheet40is molded, it adheres with the isolation washer22to reinforce its structure and to avoid deformation.