Crankshaft large fillet under cutting groove rolling mechanism

Abstract

The invention discloses a crankshaft large fillet under cutting groove rolling mechanism which comprises an upper pressing plate, a lower pressing plate, a pressing head assembly and a supporting assembly. The upper pressing plate and the lower pressing plate are hinged and driven by a hydraulic oil cylinder, the pressing head assembly is located at the pressed position of the upper pressing plate and is in location connection with the upper pressing plate, a rotating shaft, a guide wheel and two rollers arranged in a splayed mode are arranged in the pressing head assembly, a rotating shaft is sleeved with a guide wheel, the guide wheel can rotate around the rotating shaft, the two rollers are respectively located at the end corner positions of the lower portion of the guide wheel, the upper ends of the rollers are attached to fillets of the guide wheel, the lower ends of the rollers protrude out of the pressing head assembly, and rolling force is transmitted to a crankshaft large fillet under cutting groove through the guide wheel and the rollers. The supporting assembly is located at the pressed position of the lower pressing plate, is in location connection with the lower pressing plate and is provided with an arc face for containing a crankshaft, and two rotatable supporting shafts are symmetrically arranged on the arc face. When rolling is carried out, the surfaces of the two supporting shafts and the rollers form a circle on a crankshaft journal in a three-point mode. The crankshaft large fillet under cutting groove rolling mechanism can be applied to the rolling technology of a large-scale ship engine and the like requiring the large rolling force.

Description

technical field [0001] The invention relates to the field of engines, in particular to a rolling mechanism for a large fillet undercut groove of an engine crankshaft. Background technique [0002] The crankshaft fillet rolling process is the main method to improve the fatigue strength of the crankshaft. After the ductile iron crankshaft is implemented with the journal fillet rolling process, the service life can be increased by 100%-300%, which has good processability and economy. Most of the rolling mechanism is shaped like a pair of pliers. The top of the jaw is the indenter body with rollers, and the bottom of the jaw is the support body. The tail of the pliers uses an oil cylinder to exert clamping force on the upper and lower pressure plates of the pliers, and the force is transmitted to the pliers through the upper and lower pressure plates. On the roller, the pressure in the oil cylinder is accurately controlled by the servo system. Before rolling, a fillet undercut ...

AI Technical Summary

Problems solved by technology

And for the fillet rolling of the ductile iron crankshaft of a large marine engine, the large fillet undercutting groove of about R5mm needs a lot of rolling force. The structure, size, strength, positioning, etc. of the pressure plate put forward new requirements, but the rolling mechanism of the small round corner sinking groove in the existing technology can no longer meet the above requirements

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