The Japan Steel Works, Ltd.

Kengo Takeya

Shinichi Okimoto

A movable die is fastened to a stationary die, a relationship between a contact force of an injection nozzle to an injection hole of the stationary die and a closeness is investigated, the injection nozzle is brought into press contact with the injection hole of the stationary die by a contact force achieving a predetermined closeness, and a lubricant is coated by a predetermined pressure. At this occasion, one end portion of a cavity is opened or air is exhausted from the end portion as necessary. The lubricant is coated as mist by being mixed with a compressed gas. Further, the lubricant is coated by maintaining constant a pressure difference between a pressure applied to the lubricant and an inner pressure of the cavity and a pressure difference between a pressure of the compressed gas and the inner pressure of the cavity.

Method of coating lubricant in metallic injection machine

In a control method of the injection molding in accordance with the invention, in the process of injecting molding a low-melting-point alloy, an upper limit Q and a control lower limit CQ of a quantity of material detained in a cylinder are set to eliminate an excess or a shortage of the quantity of material detained in the cylinder A material in a quantity greater than shot weight Q is fed continuously into the cylinder until the upper limit is reached, while the material in a quantity less than the shot weight is fed into the cylinder until the lower limit is reached, thereby automatically maintaining the quantity of material detained in the cylinder within the range between the upper and lower limits. Accordingly, the down time due to the instability of metering in a molding machine can be reduced, and manpower for adjustment of conditions is not required, thereby making it possible to curtail the cost.

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Hiroshima, Japan

Kengo Takeya