In this footage a fully automatic crankshaft straightening machine takes hardened crankshafts from the heat-treatment line and corrects their bend without operator handling. A gantry loader seats each shaft on multi-point supports that accommodate the offset crankpins, the measuring carriage scans every main journal, and the CNC straightens automatically before the part is unloaded onto the outbound conveyor.
Hardened crankshafts spring back unpredictably, so the control uses measured force-and-deflection data to compensate each stroke, converging on automotive TIR of 0.02–0.05 mm in a closed measure–press–remeasure loop at 20–90 seconds per shaft. Explore the platform options in our automatic straightening machine range.
The system is built for passenger-car and diesel-engine plants where consistency matters more than shop-floor skill: one worker can oversee several fully automatic machines instead of hand-pressing every shaft. Incoming and outgoing conveyors can link the machine to the heat-treatment furnace and the machining cell, so straightened crankshafts flow directly to the next operation, and each shaft’s before-and-after runout is stored for quality traceability. For the control logic behind hardened parts, our article on springback compensation after heat treatment explains how tolerance is reached without trial-and-error.
Ready to move on from hand straightening? Send us your shaft drawings for a machine proposal, or arrange a visit to our Tengzhou factory.
Gantry loading for unattended crankshaft straightening
Multi-point supports adapt to eccentric crankpin geometry
Closed-loop correction reaches automotive TIR 0.02–0.05 mm
Springback compensation for induction-hardened forgings
One operator oversees several machines; 20–90 second cycles
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