Heat radiating plate and method for producing same
AssigneeDowa Metaltech Co., Ltd.
InventorsTomotsugu Aoyama, Akira Sugawara
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Abstract
A method for producing a heat radiating plate, the method containing the steps of: finish cold-rolling an annealed material to obtain a strip; causing the strip to wind in the shape of a coil to prepare a coil stock; unwinding the coil stock by means of an uncoiler to obtain a strip; causing the strip to pass through a gap between the rolls of a leveler to correct the shape thereof; progressively feeding the corrected strip to a progressive die via a feeder to progressively press-working the strip to produce a heat radiating plate.
Claims5
A heat radiating plate which has a thickness of 2 to 5 mm and which has surface layer portions on both sides thereof, the surface layer portions being softer than a central portion of the heat radiation plate so that a ratio (Hs/Hc) of an average hardness Hs (HV0.2) at a 1/12 position in thickness directions of the heat radiation plate to an average hardness Hc (HV0.2) at a 1/2 position in the thickness directions is not greater than 0.95.
Dependencies are inferred from the claim text.