The invention provides a complete
residual compressive stress straightening device and technology for a
crankshaft. The device and technology solve the technical problems that after an existing
crankshaft finished product is accurately ground, a straightening technology is required, cold straightening is not allowed, press rectification cannot be conducted on a press
machine, either, and therefore tensile stresses can be formed on the surfaces, opposite to loading force, of the circular bead positions at the two ends easily, the original fatigue strength of the
crankshaft is lowered, and
cracking can happen easily in the work running process of an engine. The complete
residual compressive stress straightening device is provided with an upper rolling swing arm and a lower rolling swing arm. One end of the upper rolling swing arm and one end of the lower rolling swing arm are hinged together through an open pressurization device, and the other end of the upper rolling swing arm is provided with an upper rolling part. The upper rolling part comprises an upper rolling wheel, and the upper rolling wheel is connected with the upper rolling part in a rotating mode. The other end of the lower rolling swing arm is provided with a lower support rolling part. The lower support rolling part comprises lower support roller wheels, and the lower support roller wheels are connected with the lower support rolling part in a rotating mode. The complete
residual compressive stress straightening device and technology can be widely applied to correction happening when radial run-out of the crankshaft is out of tolerance.