Keihin Corporation

Shinichi Oomachi

Fumihiro Sakuma

Katsuo Nagashima

An application method of a powder mold lubricant for a vacuum die-casting mold can effectively apply the powder mold lubricant onto a mold surface of the mold cavity with supplying the powder mold lubricant in small amount, can avoid liquefying of the power mold lubricant to degrade quality of a product, and can avoid loss in cycle time in a vacuum die-casting operation. The method for applying a powder mold lubricant in a vacuum die-casting apparatus includes steps of clamping a movable mother die and a stationary mother die, and defining a mold cavity by a movable insert die and a stationary insert die, in which a plunger tip is movably disposed within a sleeve opens a molten material supply hole and blocks communication between the sleeve and the mold cavity, an application step of applying a powder mold lubricant to a mold surface of the mold cavity by directly supplying a powder mold lubricant in a powder storage tank directly to a mold cavity through a powder discharge passage and a molten material supply passage, a vacuum pressure introducing step blocking a powder suction passage opening to the mold cavity and communicating a vacuum source and a molten material supply passage opening in the mold cavity, for maintaining the interior of the mold cavity in vacuum condition, the vacuum pressure introducing step being performed following the powder mold lubricant application step.

Application method of powder mold lubricant to vacuum die-casting mold

In a method for applying a powder state mold lubricant onto a die-casting mold, a movable mother die and a stationary mother die are clamped to define a mold cavity with a movable insert die and a stationary insert die, in which a plunger tip slidably arranged within a sleeve opens a molten material supply hole, and communication between the sleeve and the mold cavity is blocked. A pressure within the mold cavity is reduced by opening a powder suction passage opening into the mold cavity and establishing communication between a powder discharge passage communicated with a powder storage source and a molten material supply passage opening to the mold cavity. The powder state mold lubricant is directly within the powder storage source into the mold cavity via the molten material supply passage for applying the powder state mold lubricant on the mold surface of the mold cavity. With such constriction, the powder state mold lubricant will not pass through the chamber or passage having large volume but pass through passages having small volume, the powder state mold lubricant will never fall down to be accumulated within the passage.

Growing community of inventors

Natori, Japan

Shinichi Oomachi