A die casting system includes a die having a plurality of die elements that define a die cavity. A charge of material is received in the die cavity. The charge of material comprises a refractory metal intermetallic composite based material system. A die casting method includes casting a component from the refractory metal intermetallic composite based material system.

The die casting machine includes: a sleeve with tubular shape, the sleeve communicating with inner space of a die casting mold; a plunger disposed in the sleeve, the plunger moving along a central axis of the sleeve; a sensor for measuring pressure of the inner space of the die casting mold; and a controller programmed to perform an airtight inspection of the die casting mold, during outside a molding period of a die casting product by the die casting machine; in the airtight inspection, wherein the controller is programmed to: pump gas in the sleeve to the inner space, or suck gas in the inner space into the sleeve, by moving the plunger in a clamping state, wherein the clamping state is a state of the die casting mold being clamped; obtain the pressure of the inner space from the sensor; determine an abnormality in airtightness of the die casting mold using measurement result of the pressure of the inner space.

A pressure die casting process and its machine are described to produce a highly efficient copper rotor for AC induction motors widely used in various industries. The pressure die casting process and the machine facilitate improvement in efficiency and performance of AC induction motors by providing maximum filling of copper with minimum porosity. Thus, a compact and convenient method is provided to cast a wide range of copper rotors of various extensive length.

A pressure die casting process and its machine are described to produce a highly efficient copper rotor for AC induction motors widely used in various industries. The pressure die casting process and the machine facilitate improvement in efficiency and performance of AC induction motors by providing maximum filling of copper with minimum porosity. Thus, a compact and convenient method is provided to cast a wide range of copper rotors of various extensive length.

A die casting method includes a step of supplying molten metal to a plunger sleeve, and a step of advancing a plunger in the plunger sleeve, to inject the molten metal into dies. In the step of injecting the molten metal into the dies, the plunger is once retracted before being advanced, and the plunger is kept accelerated until the plunger reaches a target maximum speed when the plunger retracted is advanced.

A die casting method includes a step of supplying molten metal to a plunger sleeve, and a step of advancing a plunger in the plunger sleeve, to inject the molten metal into dies. In the step of injecting the molten metal into the dies, the plunger is once retracted before being advanced, and the plunger is kept accelerated until the plunger reaches a target maximum speed when the plunger retracted is advanced.

A die casting machine of an embodiment includes: a holding furnace holding molten metal; a sleeve located outside the holding furnace and having a molten metal supply port passing through a mold; a plunger sliding through the sleeve and including a plunger rod and a plunger tip fixed to a tip of the plunger rod; a molten metal supply pipe supplying the molten metal into the sleeve and attachable to and detachable from the molten metal supply port; and a moving mechanism detaching the molten metal supply pipe from the molten metal supply port when the plunger is sliding.

A die casting machine of an embodiment includes: a holding furnace holding molten metal; a sleeve located outside the holding furnace and having a molten metal supply port passing through a mold; a plunger sliding through the sleeve and including a plunger rod and a plunger tip fixed to a tip of the plunger rod; a molten metal supply pipe supplying the molten metal into the sleeve and attachable to and detachable from the molten metal supply port; and a moving mechanism detaching the molten metal supply pipe from the molten metal supply port when the plunger is sliding.

A die casting machine of an embodiment includes: a holding furnace holding molten metal; a sleeve located outside the holding furnace and having a molten metal supply port passing through a mold; a plunger sliding through the sleeve and including a plunger rod and a plunger tip fixed to a tip of the plunger rod; a molten metal supply pipe pushed against the sleeve to cover the molten metal supply port and supplying the molten metal into the sleeve; and a pushing force variable mechanism reducing a pushing force for the sleeve in the molten metal supply pipe when the plunger is sliding.

A die casting machine of an embodiment includes: a holding furnace holding molten metal; a sleeve located outside the holding furnace and having a molten metal supply port passing through a mold; a plunger sliding through the sleeve and including a plunger rod and a plunger tip fixed to a tip of the plunger rod; a molten metal supply pipe pushed against the sleeve to cover the molten metal supply port and supplying the molten metal into the sleeve; and a pushing force variable mechanism reducing a pushing force for the sleeve in the molten metal supply pipe when the plunger is sliding.