What is the crankshaft? What is the Hardness
Release time：
2023-06-30
Most crankshafts are made of ductile iron, and the quenching hardness varies depending on the grade. The hardness is mostly between HB130 and -240.
The crankshaft bears the force transmitted by the connecting rod and converts it into torque, which is output by the crankshaft and drives other accessories on the engine to work.
The crankshaft is subjected to the combined action of centrifugal force from rotating mass, periodic gas inertia force, and reciprocating inertia force, which causes the crankshaft to withstand bending and torsional loads. Therefore, it is required that the crankshaft has sufficient strength and stiffness, and the surface of the journal should be wear-resistant, work evenly, and have good balance.
Surface Strengthening Technology for Crankshaft
Nodular cast iron crankshaft fillet rolling strengthening will be widely used in crankshaft processing. In addition, composite strengthening processes such as fillet rolling strengthening and journal surface quenching will also be widely used in crankshaft processing. Forged steel crankshaft strengthening methods will more often use journal and fillet quenching treatment.
Crankshaft soft nitriding
For mass-produced crankshafts, in order to improve product quality, a microcomputer controlled nitrogen based atmosphere gas soft nitriding production line will be adopted in the future. The nitrogen based atmosphere gas soft nitriding production line consists of a front cleaning machine (cleaning and drying), a preheating furnace, a soft nitriding furnace, a cooling oil tank, a rear cleaning machine (cleaning and drying), a control system, and a gas production and distribution system.
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