Normalizing equipment of marine nodular cast iron crankshaft

Abstract

The invention discloses normalizing equipment of a marine nodular cast iron crankshaft, relating to the heat treatment field. The normalizing equipment comprises a suspended type electric heating furnace with a conveying chain and an automatic rotating cooling device, wherein a suspended hanging appliance comprising a boom and a hanger plate is arranged in the suspended type electric heating furnace, and boom holes are formed at the periphery of the hanger plate; the automatic rotating cooling device comprises a base provided with a rotating shaft and a motor, and the motor is connected with the rotating shaft by a transmission mechanism; a rotating frame movably connected with the boom is arranged at the top end of the rotating shaft, and a cooling air sprayer is arranged near the rotating frame. The normalizing equipment solves the problems that during normalization of the crankshaft, as a placement table of a crankshaft blank from a heat treatment furnace cannot rotate and one side of the crankshaft is blown by a fan all the time, the hardness difference of the cross section of the casting can reach more than HBW50 due to non-uniform cross section tissues caused by coarse grains of certain parts of the crankshaft, the mechanical property of the product is influenced, and the crankshaft can be bent and deformed due to large stress difference.

Description

Technical field [0001] The invention relates to a metal heat treatment equipment, more specifically, a heat treatment special equipment for normalizing marine ductile iron crankshaft castings. Background technique [0002] With the rapid development of the shipbuilding industry, the annual demand for marine engines in my country is increasing rapidly every year. As the core component of the engine, the crankshaft plays a key role in the process of energy conversion and power output. The marine crankshaft is a diesel engine directly connected to the propeller shaft. Transmitting propulsion. In the production of marine crankshafts, one type is made of Cu-Mo ductile iron. The ductile iron crankshaft has good wear resistance, good shock absorption, and good workability. The cost of blank production is 30% lower than that of forged steel crankshafts. High cost performance, in line with lightweight requirements. However, in the traditional production process of ductile iron crankshaft...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems existing in the prior art, the present invention provides a normalizing equipment for marine nodular cast iron crankshafts, which can solve the problem of uneven cross-sectional structure after heat treatment of the crankshaft, which leads to the hardness difference of the casting cross-section reaching above HBW50 and the different cooling conditions. There are also great differences in stress and thermal stress, which can easily cause the problem of workpiece deflection and deformation

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