After more than five years, and after parent company Daimler AG spent $1.5 billion to develop a new heavy-duty engine platform, Detroit Diesel Corp (Redford, MI) has introduced the DD15 diesel engine to US trucking fleets. The DD15 is the first of three models in the new global family of engines with blocks that are designed to be machined interchangeably on a flexible machining line without changeover. Engine blocks for the DD15 are being machined on a turnkey engine-block manufacturing system supplied by Heller Machine Tools. The three-phase manufacturing system is a fully automated, gantry-loaded hybrid system in which 1200 lb (544-kg) special-grade, cast-iron blocks are machined ready for assembly in ten machining operations. In the Detroit Diesel's first operation, the system's 400D HMC center mills the crankshaft half-round and rough face mills the front and rear face, pan face, and bearing cap face, and also drills transport holes.
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