Automobiles and some transmission shafts must be forged, mainly crankshaft parts. Forging is a processing method that stops hitting block and rod-shaped aluminum materials to shape them. The forging in which the forging billet is heated to a temperature higher than the recrystallization temperature and stopped is called hot forging. Hot forging manufactures the forging billet into a shape close to the product, while changing the mechanical properties of aluminum forgings. Lanxi Tongli Aluminum said that the crankshafts, camshafts, sprocket gears, etc. that require high rigidity in auto parts are all hot forged forgings. An automobile crankshaft is a shaft component inside the automobile engine that converts the linear motion of the driving piston into a rotation. The crankshaft is composed of main shaft, piston connecting rod, connecting rod pin, balance weight and other parts fixed on the engine.
In the past, the materials used for forging crankshafts of automobiles were generally heat treatment materials (quenched and tempered) of carbon aluminum and Cr-Mo aluminum. After the 1970s, in order to reduce the cost of materials, the development of non-quenched and tempered aluminum was promoted. Nowadays, non-quenched and tempered aluminum such as V-containing carbon aluminum (high fatigue strength aluminum) and V-free carbon aluminum have become automobile forged crankshafts. Mainstream aluminum species used for materials.
Lanxi Tongli Aluminum said that in order to change the fatigue strength of the crankshaft, after the crankshaft is machined, high-frequency quenching, nitrocarburizing, and rolling processing should be stopped on the crankshaft connecting rod pins and the main shaft fillet. Change the strength of these parts.
When the forging of the automobile crankshaft is stopped, the hot forging is usually stopped after heating the forging billet to about 1200°C. In this way, small forging equipment can be used to apply a small load and stop forging with good precision. When manufacturing forged crankshafts, not only the quality control of the forging is required, but also strict quality control is required for the system processes from crankshaft data design, crankshaft shape design, aluminum smelting to forging. Crankshafts or axle products processed with rods are prone to forging cracking quality objections.