Manufacturing method of enameled flat wire using die for flat wire coating
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United States of America Patent
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Aug 18, 2015
Grant Date -
Nov 14, 2013
app pub date -
Jul 11, 2013
filing date -
Jan 8, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A manufacturing method uses a solid coating die for applying an insulation varnish around a flat wire conductor. The die includes a die body and a die hole formed through the die body, into which the conductor is inserted. The die hole includes an entry portion having a cross section monotonically decreasing along a conductor insertion direction, and a coating portion including at least a sub-portion having a constant cross section. The cross section of the coating portion is a rectangle having four straight sides and four rounded corners. Each inner surface of each straight side has an inwardly projecting protrusion, a top contour of each protrusion being a circular arc, an elongated circular arc, an elliptical arc or a combination of these arcs, the maximum curvature of the top contour of each protrusion being larger than the maximum curvature of inner surface of the rounded corners.
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