Crankshaft is one of the key components of motorcycle engine, its quality and performance directly affect the working efficiency and life of the engine. Aluminum alloy crankshaft forgings have been widely concerned for their light weight, high strength and good corrosion resistance. This paper focuses on the manufacturing process and quality control method of motorcycle aluminum alloy crankshaft forgings.
Manufacturing process
Material selection: First of all, it is necessary to choose the appropriate aluminum alloy material, commonly used 2 series, 6 series and 7 series aluminum alloy. These materials have good forging properties, mechanical properties and corrosion resistance.
Smelting and pouring: The selected aluminum alloy material is smelted, and the melting temperature and time are controlled to ensure the uniform alloy composition. The molten aluminum is then poured into a preheated forging die.
Forging: At the right temperature and speed, the aluminum alloy blank is forged, and it is deformed by extrusion, hammering or pressing to obtain the desired shape and size.
Heat treatment: The crankshaft after forging needs to be heat treated, such as solution treatment, aging treatment, etc., to further improve its mechanical properties and corrosion resistance.
Machining: Machining the crankshaft after forging, such as turning, milling, drilling, etc., to meet the precise size and surface quality requirements.
Surface treatment: The final surface treatment, such as sandblasting, anodizing, painting, etc., to improve the corrosion resistance and beauty of the crankshaft.
Quality control
Raw material inspection: The aluminum alloy materials entering the factory are strictly inspected to ensure that their chemical composition and mechanical properties meet the standard requirements.
Process parameter control: strictly control melting, forging, heat treatment and other process parameters to ensure that each step of the process is carried out under the right conditions.
Intermediate inspection: Intermediate inspection is carried out after key processes, such as metallographic inspection after forging, hardness test after heat treatment, etc., to discover and deal with problems in time.
Finished product inspection: a comprehensive inspection of the crankshaft completed by forging, including dimensional accuracy, surface quality, mechanical properties testing, etc., to ensure that the product meets the design requirements.
Quality traceability: Establish a sound quality traceability system, record the key data in the production process, and facilitate the follow-up quality problem traceability and analysis.
The manufacturing process of motorcycle aluminum alloy crankshaft forging involves many links such as material selection, melting and pouring, forging, heat treatment, machining and surface treatment. In order to ensure the quality of crankshaft forgings, it is necessary to carry out comprehensive quality control from raw material inspection, process parameter control, intermediate inspection, finished product inspection to quality traceability. Through strict manufacturing process and quality control, high performance and high quality aluminum alloy crankshaft forgings can be produced to ensure the safety and performance of motorcycles.
