Marine crankshaft forging is the key component of Marine engine, and its manufacturing process needs to go through many links and fine process control. This article will analyze in detail the manufacturing process of Marine crankshaft forgings, including raw material preparation, forging, heat treatment, machining, quality inspection and final product inspection and packaging.
First of all, we must choose high-quality steel as raw materials. According to the design requirements, different grades of steel can be selected, such as alloy steel, carbon steel, etc. These steels need to undergo a series of inspections such as chemical composition analysis and mechanical properties testing to ensure that their quality meets the requirements. Then, the steel is cut into the appropriate size blank according to the forging requirements.
Forging is the key link in the manufacturing process of crankshaft forging. First, the blank is heated to the appropriate forging temperature to increase its plasticity and reduce deformation resistance. Then, the heated blank is forged on the forging equipment, and it is gradually deformed and approximated to the final shape by hammering or pressing it several times. In the forging process, parameters such as temperature, deformation and forging speed need to be strictly controlled to ensure the quality and performance of the forging.
After forging is completed, it is necessary to heat treat the forging to eliminate the forging stress, improve the structure and improve the mechanical properties. Common heat treatment methods include normalizing, quenching and tempering. Normalizing can refine grain and improve toughness. Quenching can increase hardness and wear resistance; Tempering can eliminate quenching stress and stabilize microstructure and properties. In the heat treatment process, it is necessary to strictly control the heating temperature, holding time and cooling speed.
After heat treatment, the forgings need to be machined to achieve the size and shape accuracy required by the design. Machining includes two stages of roughing and finishing. Roughing is mainly to remove excess material to form the basic shape; Finishing is to further improve dimensional accuracy and surface quality. It is necessary to select the appropriate tool and cutting parameters in the machining process, and strictly control the machining error.
During the manufacturing process, multiple quality checks are required to ensure that the quality of the forgings meets the requirements. Quality inspection includes appearance inspection, size measurement, hardness testing, chemical composition analysis and other aspects. For unqualified forgings, it is necessary to rework or scrap them in time.
Finally, the crankshaft forgings after machining and quality inspection are finally inspected. Mainly check whether its dimensional accuracy, surface quality, mechanical properties and so on meet the design requirements. Qualified forgings will be cleaned, treated against rust, and packed as required for transport and storage.
The manufacturing process of Marine crankshaft forgings is a complex and fine process, involving raw material preparation, forging, heat treatment, machining and other links. Only by strictly controlling the quality of each link can we produce high-quality Marine crankshaft forgings. With the development of science and technology and the continuous improvement of the process, the manufacturing process of Marine crankshaft forgings will be more efficient and accurate.
