B - Operations – Transporting – 22 – D
Patent
B - Operations, Transporting
22
D
148/11, 117/157,
B22D 13/02 (2006.01)
Patent
CA 1036319
ABSTRACT A system is disclosed for casting rollers having an external cylindrical surface defined by firmly-held carbide particles. As disclosed, a cylin- drical mold is revolved about a central horizontal axis and heavy, tungsten-carbide particles are released within the mold to accumulate as a layer on the internal cylindrical surface of the mold. Molten metal of specific characteristics is injected into the mold; being lighter does not displace the particles at the mold surface, yet forces and characteristics are such that the metal wets the particles and fills the inter- stices therebetween to provide an effective matrix upon solidification. Heat treatment overcomes the problem attendant the inherent rapid cooling, after which the metal may be machined. Requisite character- istics of the metal for the disclosed process include: dimensional stability, high compressive yield strength, high shock and impact resistance and good casting characteristics as high fluidity and low surface tension to "wet" the tungsten-carbide particles.
219949
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