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US 4,064,928 AGranted
Die casting machine
AssigneeEx-Cell-O Corporation
InventorWilliam G. Wunder
Life of this patent
Estimating the term…
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AssigneeEx-Cell-O Corporation
InventorWilliam G. Wunder
Estimating the term…
Die casting apparatus for casting parts such as rotors or the like comprises a three tie bar horizontally disposed die casting machine, with an indexing mechanism mounted on one of the tie bars for rotating the parts through six separate radially spaced work stations. The work stations include loading, casting, cooling, skew pin ejection, and unloading stations. The casting station includes a four plate die assembly comprising a runner plate, cover die, carrier plate, and ejector die. The die assembly employs pin-point gating and is formed such that the cast part is removed from the die and the runner system, and the runner system is ejected from the apparatus, while the part is at the casting station. A movable runner ejector plate having ejector pins ejects the runner from the runner plate. A compensating cylinder is provided for adjustment for variance in stack height. An ejector mechanism employing ejector pins removes the cast part from the ejector die so as to permit the cast part to be rotated to the next work station. Toggle linkages open and close the die assembly, with the toggle linkages being inclined inwardly at an angle of 10.degree. with respect to the tie bars between the back plate and the traveling plate.
Die casting apparatus for casting a part comprising:
In a die casting machine wherein a part is conveyed to and from a casting station between two opposed plates that are relatively movable with respect to each other in an axial direction to open and close a die assembly holding the part, and wherein molten material is injected into the part from the outlet of a shot chamber when the die assembly is closed, producing a cast part and an attached runner system of cast material leading from the shot chamber to the cast part, and wherein one of the plates is thereafter retracted with respect to the other to open the die assembly, the improvement comprising:
In a molding machine including opposed front and back plates and an axially reciprocable traveling plate mounted between them for opening and closing a die assembly mounted between the traveling plate and front plate, a plurality of spaced, axially disposed tie bars interconnecting the plates, the die assembly being approximately centered with respect to the tie bars and approximately equidistant from each tie bar, a toggle linkage mechanism extending between the back plate and traveling plate for reciprocating the traveling plate to open and close the die assembly, the toggle linkage mechanism including a separate toggle linkage for each tie bar positioned adjacent each tie bar between the tie bar and the axis of the die assembly, the improvement wherein each toggle linkage comprises anchor means for attaching the toggle linkage to the opposing faces of the back plate and traveling plate for pivotal movement approximately in the plane extending between the tie bar and the axis of the die assembly, the anchor means on the traveling plate being positioned inwardly along said plane with respect to the position of the anchor means on the back plate, such that the toggle linkage is inclined inwardly with respect to the axis of the tie bar in extending from the back plate to the traveling plate.
Dependencies are inferred from the claim text.