Study on the regulation of metal streamline distribution and anisotropy of mechanical properties during forged aluminum alloy front fork
Publish Time: 2024-12-03
During the forged aluminum alloy front fork process, the distribution of metal streamlines has a critical influence on its final mechanical properties, and the anisotropy of mechanical properties is directly related to the reliability and safety of the front fork in actual use.
Metal streamlines are a kind of fibrous structure formed by the elongation and deformation of metal grains along the force direction during the forging process. Reasonable regulation of metal streamline distribution can significantly improve the mechanical properties of aluminum alloy front forks. For example, by optimizing the design of the forging die and the forging process parameters, the metal streamlines can be continuously and evenly distributed along the main force direction of the front fork, which can effectively improve the tensile strength and fatigue life of the front fork. When designing the die, a special cavity structure can be used according to the shape characteristics of the front fork to guide the metal to form an ideal streamline direction during the forging process.
However, the uneven distribution of metal streamlines often leads to anisotropy of mechanical properties. Along the metal streamline direction, aluminum alloy front forks usually show higher strength and toughness, because the grains are elongated and closely arranged along this direction, and the grain boundaries have a strong barrier to sliding deformation. However, perpendicular to the metal streamline direction, its strength and toughness are relatively low. Due to the relatively weak bonding between the grains, cracks are easily propagated when subjected to stress. This anisotropy may cause local stress concentration and reduce the overall performance of the front fork under complex stress conditions, such as when the front fork is subjected to multiple loads such as bending, torsion and tension at the same time.
In order to further study the relationship between metal streamline distribution and mechanical property anisotropy, a variety of advanced detection methods can be used, such as metallographic microscope to observe the morphology and distribution of metal streamlines, and obtain mechanical property data in different directions through mechanical property test experiments such as tension and torsion. With the help of numerical simulation technology, a finite element model of the forged aluminum alloy front fork process is established to predict the formation process of metal streamlines and the changes in mechanical properties under different streamline distributions. Based on these research results, the forging process is further optimized, such as adjusting parameters such as forging temperature, deformation rate and reduction, to achieve precise control of metal streamline distribution, thereby reducing the anisotropy of mechanical properties and ensuring that the aluminum alloy front fork has good and balanced mechanical properties in all directions, meeting the high-strength and high-reliability requirements during riding.
