Nissei Plastic Industrial Co., Ltd.

Masaaki Minamimura

Toshiyasu Koda

Mamoru Miyagawa

Yasuhiko Takeuchi

Fumio Shiozawa

Ikuo Uwadaira

Taku Kawano

Nobuyuki Nakamura

Yoshitoshi Yamagiwa

Haruo Okada

Masahiko Miyajima

Kikuo Sakurada

A device for melting, storing, and feeding a metal material is provided which can store a large amount of molten metal material corresponding to molding cycles with a compact configuration, using barrels to melt bar-shaped metal materials and a tank-and-barrel storage unit to store the molten metal material. The storage unit for the molten metal material is composed of an upper storage tank and a lower material temperature control barrel having a smaller diameter, the barrel being perpendicularly arranged under and in communication with the bottom center of the tank. The melting barrels for bar-shaped metal materials are made of barrel bodies having an inside diameter and a length appropriate to accommodate the bar-shaped metal materials. A more than one melting barrel is vertically arranged in parallel on a lid member of the storage tank, with their bottom openings facing the inside of the storage tank.

Device for melting, storing, and feeding metal material from bar-shaped metal material intended for injection apparatus for molding metal product

There is provided a method for melting a material rod in a material melting and holding apparatus of a metal molding apparatus where the material melting and holding apparatus provided for the metal molding apparatus includes a furnace body of a melting and holding furnace, and a melting cylinder for a material rod and a material supply cylinder for directly supplying the material rod into the furnace body provided in parallel with each other on the furnace body, upon startup of molding, the material rod is melted using the melting cylinder prior to supplying the molten material from the melting cylinder into the melting and holding furnace, and the material rod subsequently supplied from the material supply cylinder to a bottom portion of the furnace body is submerged and melted by the molten material, thereby maintaining the submersion melting in the melting and holding furnace after the startup of molding.

Material melting and holding apparatus of metal molding apparatus and rod material melting method

A method of preventing leaking of molten metal from a nozzle in an injection apparatus comprising, metering the molten metal by travel of a plunger head backward from a most forward position to a most backward position at the rear of a supply opening while maintaining nozzle contact after completion of an injection step and supplying molten metal from a furnace into a cylinder body through the supply opening, after completion of the metering, closing the supply opening by travel of the plunger head forward at a low speed from the backward position to a stand-by position ahead of the supply opening for cutting off the communication between the molten metal in the cylinder body and the molten metal in the furnace.

Method for preventing leaking of molten metal in injection molding of metal material

A crushing machine is disclosed which comprises a casing, a coarsely crushing blade which crushes scrap into coarsely crushed pieces, and a finely crushing blade which crushes the coarsely crushed pieces into finely crushed pieces. The coarsely crushing blade and the finely crushing blade are rotatably disposed in the casing, and jetting holes are formed in the coarsely crushing blade to jet compressed air radially outward from the coarsely crushing blade. Also, the jetting holes are connected to a compressed air passageway which is formed in the rotary shaft of the coarsely crushing blade. In addition, a stationary jetting hole is formed in the wall of the casing to jet compressed air towards a gap between the coarsely crushing blade and the finely crushing blade.

Crushing machine apparatus and a method for cleaning the crushing

A method and an apparatus for injection-molding a molten resin wherein any flaw such as warpage, shrinkage or the like does not occur in products having a small thickness when the desired product of injection molded resin is molded by injecting the molten resin into a cavity of an injection molding die. The molten resin is injected into the cavity under proper control with respect to injection speed and pressure, the pressure of the molten resin being temporarily set and reduced to a preset reference value when the cavity is filled with the molten resin, and subsequently, the pressure of the molten resin filled in the cavity is released.

Injection molding method and apparatus

An injection molding method characterized in that after resin charging is completed, with the screw allowed to rotate, process is shifted to the metering process, and using the back pressure in the metering process as a dwelling pressure, dwelling is performed simultaneously with the resin metering. In addition, with the back pressure required for metering set to a higher value as a primary back pressure, and using the back pressure as a dwelling pressure, dwelling is performed simultaneously with the resin metering, and after the dwelling time has elapsed, with the pressure allowed to lower so as to use as a secondary back pressure, the metering is continued to a set time. According to the above-mentioned method, as a whole, the required cycle time becomes shorter than in a conventional case where metering is started after dwelling.

Injection molding method

An improved injection molding method comprising, tightening an injection molding die with a die tightening force lower than that corresponding to a conventionally rated pressure, injecting a molten resin in a die cavity with an injection molding pressure of which intensity is determined corresponding to the die tightening force so that a gap is formed so as to permit only gas to flow outside of the die cavity via the gap, after completion of injecting temporarily interrupting injection molding so as to release a part of the injection molding pressure from the die cavity so as to maintain the reduced injection molding pressure in the die cavity in the uniformalized state, and raising the die tightening force up to a level corresponding to the rated pressure, and moreover, raising the injection molding pressure in the die cavity. Since a molten resin is injected in the die cavity with a low intensity of injection molding pressure with a low corresponding die tightening force, and moreover, the injection molding pressure is held in the die cavity in the uniformalized state before it is retained in the die cavity, a molded article having a small thickness and a large projected area can easily be produced without any occurrence of a malfunction such as warpage or the like.

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Nagano-ken, Japan

Masaaki Minamimura