Die-casting machine

A method for die casting magnesium pieces with a multiple-slide die-casting machine of the type having an injection unit and at least two slides mounted to a table, the table and the injection unit being relatively displaceable with respect to one another, the slides having die sections and being actuatable in a close/open action to form a die cavity at a parting line therebetween, comprising the steps of:

• closing the die sections to form the die cavity;
• engaging a nozzle of the injection unit with the parting line of the die sections by relative displacement of the table with respect to the injection unit, such that the nozzle is in fluid communication with the die cavity;
• injecting molten magnesium in the die cavity wherein the molten magnesium will solidify in the die cavity to form a magnesium cast product;
• disengaging the die cavity from the nozzle of the injection unit by relative displacement between the table and the injection unit;
• and
• opening the die sections to release the magnesium cast product.

A die-casting machine comprising:

• a frame;
• a table having pivoting means so as to be pivotally mounted to the frame;
• a slide guiding mechanism secured to the table and having at least two slides, each said slide having a die section at an operating end thereof, the at least two slides being actuatable in a close/open action such that the die sections mate at a parting line therebetween to form a die cavity;
• an injection unit fixed to the frame and adapted to be connected to a molten medium supply means, the injection unit having a nozzle and being adapted to inject molten medium from the supply means into the die cavity through the nozzle for casting a piece;
• and
• actuation means to displace the table with respect to the injection unit for engagement of the die sections with the nozzle at the parting line for injection of molten medium in the die cavity to cast a product, and for disengagement of the die sections from the nozzle to eject the casted product from the die cavity.

An injection unit for a hot-chamber die-casting machine, comprising:

• an injection portion having a gooseneck and a nozzle adapter, the injection portion having a base portion at an end of the gooseneck adapted to receive a molten medium supply, a nozzle at an end of the nozzle adapter adapted to inject the molten medium supply in a die cavity, a channel between the base portion and the nozzle adapted for conveying the molten medium supply therethrough, and a piston chamber in the base portion actuatable to draw the molten medium supply therein and to direct the molten medium supply in the channel for injection into said die cavity;
• an actuation portion connected to the gooseneck to actuate the piston chamber;
• and
• heating cartridges received in the injection portion adjacent to the channel to control a temperature of the molten medium supply in the channel.