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AssigneeMinebea Co., Ltd.
InventorsKazufusa Furukoshi, Takeaki Fuse, Naoto Miura
Estimating the term…
A swing arm for actuating a magnetic head having a multiplicity of extremely thin blade of 0.9 mm in thickness that has been difficult to produce in a conventional casting may be produced by die-casting. Fixed cores and movable cores are disposed in a casting space provided in a parting line between a fixed core and a movable core. A body casting space and a blade casting space are set. A cross-sectional area of an overflow gate provided at an end of the blade casting space is greater than a cross-sectional area of a runner gate for connecting a runner and the body casting space. At the same time, a weight of the overflow material overflowed from the overflow gate to the molten material storage portion is set to be greater than a weight of a product portion filled in the casting space. The flow of the molten material to the blade casting space that is narrow is made smooth.
A casting mold for casting a swing arm for actuating a magnetic head in which a plurality of plate blades for supporting magnetic heads are provided around a sleeve-shaped member pivoted about a pivot in a multiplicity of stages, wherein the swing arm is die-cast of aluminum alloy and the blades have a thickness of less than 1.05 mm;
The casting mold for casting the swing arm according to claim 10, wherein the overflow molten material storage portion is in communication with a chill vent in communication with an evacuation means.
The casting mold for casting the swing arm according to claim 10, wherein a heating circuit for causing thermal medium to flow is provided in and around the body casting space and the blade casting space.
The casting mold for casting the swing arm according to claim 10, wherein the thickness of the blades of the swing arm is in the range of 0.85 to 0.95 mm;
The casting mold for casting the swing arm according to claim 13, wherein the overflow molten material storage portion is in communication with a chill vent in communication with an evacuation means.
The casting mold for casting the swing arm according to claim 11, wherein a heating circuit for causing thermal medium to flow is provided in and around the body casting space and the blade casting space.
A The casting mold for casting the swing arm according to claim 14, wherein a heating circuit for causing thermal medium to flow is provided in and around the body casting space and the blade casting space.
Dependencies are inferred from the claim text.