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US 10,376,952 B2Granted
Molding machine cylinder and its production method
AssigneeHitachi Metals, Ltd.
InventorsMasatsugu Uchida, Kiyoshi Furushima
Life of this patent
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Abstract
A molding machine cylinder comprising a lining layer having a structure comprising 20-50% by area of tungsten carbide particles and 1-10% by area of tungsten-based metal carboboride particles in a nickel-based alloy matrix, and containing 1-7.5% by mass of Fe, can be produced by a centrifugal casting method comprising a first step of heating at higher than 1140° C. and lower than 1200° C., and a second step of heating at 1080-1140° C. after melting the raw material powder.
Claims5
A molding machine cylinder comprising a lining layer formed on an inner surface of a steel cylinder by a centrifugal casting method;
- said lining layer having a structure comprising 20-50% by area of tungsten carbide particles and 1-10% by area of tungsten-based metal carboboride particles in a nickel-based alloy matrix;
- and said lining layer containing 1-7.5% by mass of Fe wherein the % by area is based on a cross section of the lining layer, wherein said metal carboboride particles contain 0.5-4% by mass of C, 0.5-6% by mass of B, 65-85% by mass of W, and 1-20% by mass of Ni.
Dependencies are inferred from the claim text.