Nissei Plastic Industrial Co., Ltd.

Chiba Institute of Technology

Kazuo Anzai

Koji Takei

Ko Yamazaki

Kiyoto Takizawa

Toshiyasu Koda

Mamoru Miyagawa

Yasuhiko Takeuchi

Hidemi Aoki

Masashi Suganuma

Ikuo Uwadaira

Tetsuichi Motegi

Fumi Tanabe

The present invention provides a method for manufacturing a composite of a carbon nanomaterial and a metallic material which has a homogeneous composite metal structure and thixotropic properties by compositing a metallic material of a non-ferrous metal alloy with a carbon nanomaterial by using both stirring and ultrasonic vibration. The method comprises compositing the metallic material of the non-ferrous metal alloy with the carbon nanomaterial by adding the carbon nanomaterial in a state where the metallic material shows thixotropic properties by spheroidization of solid phase in a semi-solid state, and the compositing is performed by a process for stirring and kneading the semi-solid metallic material while keeping the temperature thereof at a solid-liquid coexisting temperature, and a process for dispersing the carbon nanomaterial to liquid phase between solid phases by ultrasonic vibration.

Method for manufacturing a composite of carbon nanomaterial and metallic material

To insert a cylindrical metallic raw material into a melting cylinder provided in a heating holding cylinder of a metal molding apparatus and to efficiently semi-melt or completely melt the cylindrical metallic raw material, a clearance between an inner circumferential surface of the melting cylinder and an outer circumferential surface of the cylindrical metallic raw material is limited to a range in which the clearance does not exceed 1.0 mm with respect to the inner diameter of the melting cylinder and the diameter of the metallic raw material during thermal expansion and the insertion of the metallic raw material in a non-thermal expansion state into the thermally expanding melting cylinder is possible, from a linear expansion coefficient of a metallic raw material and a linear expansion coefficient of a material of the melting cylinder.

Method for melting metallic raw material in metal molding apparatus

In a metal molding machine provided having a tilt to a clamping device with an injection unit which is constituted by a liquid metallic material reservoir in which a cylinder having a nozzle portion at the tip portion equipped with a heating device at the outer periphery and an injection plunger having advance or retreat freely in the inside, and the injection cylinder at the rear portion, the metallic material feeding to the above liquid metallic material reservoir is performed in liquid by melt to the temperature of above the liquidus temperature in a melting cylinder standing the liquid metallic material reservoir to liquid metallic material surface from a feeding pipe having a smaller diameter than the inner diameter of the cylinder. The melting and feeding of metallic material is performed at an atmosphere of an inert gas such as argon.

Melting and feeding method and apparatus of metallic material in metal molding machine

The present invention relates to a method of molding a low-melting-point metal alloy which exhibits thixotropy properties in a solid-phase and liquid-phase coexisting temperature region. In this method, a temperature of a heating holding cylinder is increased to a liquidus temperature or higher at the start of a molding operation. Then a remaining material in the preceding molding remaining in the heating holding cylinder in a solid state is wholly melted. After that a temperature of the heating holding cylinder is lowered to a temperature in the solid-phase and a liquid-phase coexisting temperature region. At the same time a molding material is supplied and a provisional molding is carried out. After the temperature has reached the solid-phase and liquid-phase coexisting temperature region, a regular molding is started. By the present invention a problem of a remaining material in the heating holding cylinder, which becomes a trouble at the start of molding by injection, is solved.

Method of molding low melting point metal alloy

A method of molding a low melting point metal alloy which exhibits thixotropy properties at a solid-liquid coexisting temperature, said method comprising the steps of heating said metal alloy at a temperature in the solid-liquid coexisting temperature region to form a semisolid, supplying said semisolid to a heating/holding cylinder to be accumulated, and injecting said semisolid into a mold. At the end of the molding process, a remaining semisolid material is heated to a wholly molten state, then discharged by injection, and heating is stopped so that the molding operation is finished; or, at a temporary suspension of molding, an accumulated material is heated to a wholly molten state and, at the resumption of molding, the temperature of the heating holding cylinder is lowered to the original solid-liquid coexisting temperature region while discharging said wholly molten material by injection and resupplying with new semisolid molding material.

The invention includes a shielding portion having a vent hole for discharging a gas composition G generated from a molten resin R to a barrel cylinder and having a shielding steam holding chamber C formed in connection with the barrel cylinder, the shielding steam holding chamber communicating with the vent hole. A steam supplying portion is provided for supplying a steam S to the shielding holding steam chamber C, and a discharging port portion is provided for discharging the steam S and the gas composition G from the inside of the shielding steam holding chamber C. Thereby, oxidization or carbonization of the molten resin can be prevented. In addition, adverse influence to the natural system can be removed and a decrease in the cost of the apparatus can be realized.

Vent apparatus for an injection molding machine

A method of injection molding whereby a polyethylene terephthalate (PET) without being predried or with having an irregular-shape is fed by a feed screw from a material feeder to an injection cylinder and plasticated by an injection screw. The rotational torque of the injection screw is detected in correspondence with the revolution speed of the feed screw during material feed, and a flection point of the rotational torque is determined. The feed screw is operated at a revolution speed within a range around the flection point of the rotational torque to provide a stable feed rate of the PET and to avoid difficulty in rotating the injection screw.

Method of injection molding polyethylene terephthalate

A method of injection molding polyethylene terephthalate without being predried or with having an irregular-shape wherein a vent type injection machine is employed and the vent is forcedly performed by vacuum suction within a range of a specified degree of vacuum, i.e. 50 to 150 torr (equal to 6666.1.about.19998.3 Pa.) and/or at the same time the material is forcedly fed by a feed screw having a specifically set revolution speed. According to the present invention, it is possible to provide an injection molding method in which an PET without being predried or with having an irregular-shape can be molded.

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Nagano-ken, Japan

Kazuo Anzai