| 摘要 |
PROBLEM TO BE SOLVED: To realize high precision ejection filling which can not be achieved by means of braking control of a screw, and especially to restrain occurrence of a burr by controlling a flow of a molten light alloy material with eddy current while a magnetic field, where a magnetic flux density is controlled corresponding to an ejection filling condition, is vertically applied to a flow face of the molten light alloy material. SOLUTION: Both magnetic polarities and a torpedo 5 have a coaxial arc, and so a magnetic field for passing a magnetic force line through a direction of a fan frame is formed to material passages 7, 7 with a fan-shaped cross section at a constant magnetic flux density and perpendicular to a curve face with a fan-shaped cross section. A molten light alloy material is fluidized from a surface to a back face in Figure (a), and a current is applied to the molten light alloy material in an arrow direction based on Fleming's right-hand rule. This current is an eddy current, and a force going from a back face to a surface in Figure (a) acts on the molten light alloy material based on the eddy current and the magnetic force line, so that a braking force is worked for reversing the flow. The braking force is proportional to the size of the eddy current, and the eddy current is proportional to flow velocity of the molten light alloy material and magnetic flux density of the magnetic field.
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