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Powder metallurgy rotor adapter assembly from GKN wins MPIF grand prize.
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GKN Sinter Metals, Auburn Hills, Mich., has won the grand prize in the automotive engine category in the 2012 Powder Metallurgy Design Excellence Awards competition sponsored by the Metal Powder Industries Federation. The VVT rotor adapter assembly consists of a PM steel rotor and adapter that are joined by an adhesive on the inside diameter that also seals the joint.
The assembly, used in a Chrysler V‐6 engine, is mounted to the engine camshaft. Formed to a density of 6.8 g/cm3, the rotor has an ultimate tensile strength of 60,000 psi, yield strength of 55,000 psi, and a 23,000 psi fatigue limit. The adapter is formed to a density of 6.9 g/cm3, and has a minimum ultimate tensile strength of 58,000 psi, and yield strength of 53,000 psi.
After sizing and grinding, no other machining is done on the rotor. The adapter is not machined prior to assembly, and is made to net shape with vertical slots for oil feeding. However, the customer machines the cross holes for the oil feed.
Source: ASM International
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