Multiple casting apparauts and method

The method of die casting a finished battery part while inhibiting the formation of cracks and tears comprising the steps of:

• directing a first charge of lead in a molten state into a battery part cavity having at least one open face;
• extending a retractable piston having a battery part face into the charge of molten lead in the battery part cavity to shut off the supply of molten lead to the battery part cavity;
• and
• continuing to extend the piston to form a closed battery part cavity and to reduce the volume of lead in the battery part cavity to a sufficient volume so that upon solidification of the lead in the battery part cavity it inhibits the formation of cracks and tears in the battery part.

The method of die casting a finished battery part comprising the steps of:

• injecting a molten lead containing metal into a battery part cavity having a first volume defined by a set of mold faces;
• and
• decreasing the first volume of the battery part cavity by forcing at least one of the mold faces toward the battery part cavity to decrease the peripheral surface area while the molten lead in the battery part cavity is at least partially in an unsolidified state;
• and
• maintaining the decreased volume during a solidification of a battery part in the battery part cavity to thereby inhibit the formation of cracks and tears in a die cast battery part.

The method of die casting a finished battery part while minimize cracks and voids in the battery part comprising the steps:

• forming a mold with the mold defining a plurality of faces of a first portion of a battery part mold cavity;
• forming a gate passage fluidly connected to the first portion of the battery part mold cavity;
• forming a moveable member, the moveable member having a portion defining a further face of the battery part mold cavity with the plurality of faces and the further face defined a surface bounded mold cavity when the moveable member is in a closed condition;
• pouring a lead containing metal in a fluid state into the gate of the mold when the mold cavity is in an open condition;
• allowing the lead containing metal to fill the first portion of the battery part mold cavity;
• and
• driving the moveable member toward the first portion the battery mold part to close off the gate passageway;
• continuing to drive the movable member toward the first portion of the battery mold part until the further face forms the surface bounded mold cavity and the internal pressure of the lead in the mold increases sufficiently to force lead into any solidification voids formed in the batter part;
• and
• allowing the battery part to solidify under pressure;
• removing the mold from the battery part to produce a finished battery part.

The method of forming a finished battery part comprising the steps of:

• pouring a lead containing metal in a liquid state into an open battery cavity defined by a first set of faces in a battery part mold;
• allowing the lead containing metal to begin solidification around the first set of faces in the battery part mold;
• driving a member having a portion defining a completion face toward the open battery cavity until the completion face on the first set of faces coact to form a closed peripheral surface;
• and
• maintaining a pressure on the batter part during solidification of the metal in a liquid state to force molten lead into any solidification voids formed during solidification of the molten lead in the battery part cavity.

The method of die casting a battery part comprising:

• injecting a lead containing metal in a molten state into an open battery part cavity partially defined by a mold;
• closing the battery part cavity by bringing a member with a finished mold face toward the open battery part cavity partially defined by the mold to create a closed battery part cavity to thereby prevent further lead containing metal in a molten state from entering or leaving the closed battery part cavity;
• and
• increasing the pressure of the lead in the closed battery part cavity to force lead that is in a molten state into any solidification voids in lead in the closed battery part cavity to thereby inhibit the formation tears and cracks in the batter part.

The method of die casting a finished battery part comprising the steps of:

• injecting a molten lead containing metal into an open battery part cavity defined by a set of mold faces;
• closing the battery part cavity with a face of a moveable member to create a closed battery part cavity with a peripheral surface area;
• decreasing a first volume of the battery part cavity by decreasing the peripheral surface area;
• and
• maintaining the decreased volume during a solidification of a battery part in the battery part cavity to thereby inhibit the formation of cracks and tears in a die cast battery part.