Magnesium alloy hot extruded rectangular rod
Magnesium alloy hot-extruded rectangular bars are rectangular cross-section magnesium alloy bars produced through a hot extrusion process. They feature high dimensional accuracy, uniform mechanical properties, and excellent processability, making them widely used in machinery manufacturing, aerospace, medical devices, and other fields. Compared to round bars, rectangular bars have a well-defined long and short side, allowing them to be directly used in the processing of parts requiring flat contact or specific mounting spaces, reducing machining effort and improving production efficiency. Commonly used alloys include AZ31B, AZ80, and ZK60. Different alloys offer distinct strength, hardness, and corrosion resistance, meeting the requirements of diverse operating conditions.
The production process for hot-extruded magnesium alloy rectangular bars requires a focused approach to controlling the extrusion die and forming parameters to ensure the accuracy and perpendicularity of the rectangular cross-section. First, the rectangular die hole of the die is designed based on the length and width of the rectangular bar. The corner radius and working zone length are optimized to prevent corner collapse or dimensional deviation during extrusion. After homogenization annealing (350-450°C), the magnesium alloy ingot is heated to 280-400°C and placed in an extrusion barrel. Pressure is applied by the extrusion shaft, forcing the billet through the rectangular die hole to form the initial rectangular bar. During the extrusion process, the extrusion speed (generally 1-6 m/min) and extrusion ratio (15-40) must be controlled to ensure uniform metal flow within the die hole and consistent dimensions across the rectangular cross-section. The extruded rectangular bar is cooled, straightened, and descaled before being cut. Some products undergo aging treatment to improve mechanical properties. Finally, precision measurement is performed to ensure that the length and width dimensional tolerances are within ±0.1 mm.
In the machinery manufacturing sector, hot-extruded magnesium alloy rectangular bars are a high-quality material for precision sliders and guide rails. Linear guide sliders in automated equipment are made from AZ80 magnesium alloy rectangular bars. Their high strength (tensile strength of 380 MPa) ensures stability during high-speed movement, while their lightweight design reduces drive system energy consumption. In the mold industry, magnesium alloy rectangular bars are used in the mold plates of small stamping dies, reducing mold weight while facilitating the creation of precise cavities and positioning holes, shortening mold development cycles. Furthermore, in textile machinery, rectangular bars are used to form support bases for drafting rollers. Their excellent wear resistance and shock absorption properties reduce yarn breakage during the drafting process.
Hot-extruded magnesium alloy rectangular bars are widely used in the aerospace and medical device sectors. In aircraft door structures, rectangular bars serve as connectors supporting the frame and are bolted to other components. Their high strength and lightweight properties reduce the door’s opening inertia and enhance operational convenience. In spacecraft solar panel mounts, ZK60 magnesium alloy rectangular bars exhibit excellent fatigue resistance, withstanding the stresses generated by the fluctuating temperatures in space and ensuring stable deployment of the panels. In the medical device sector, AZ31B magnesium alloy rectangular bars are used in the lifting mechanisms of operating tables, meeting strength requirements while reducing the weight of the operating table, making it easier for medical staff to adjust the surgical position.
With the development of the high-end manufacturing industry, the performance and application of hot-extruded magnesium alloy rectangular bars are continuously improving. By developing high-precision molds and constant-temperature extrusion technology, manufacturers can produce ultra-thin-walled rectangular bars with large aspect ratios to meet the precision structural requirements of microelectronic devices. Furthermore, surface modification techniques (such as micro-arc oxidation) are used to improve the corrosion and wear resistance of the rectangular bars, expanding their application in humid and dusty environments. Regarding material recycling, the high recycling rate of magnesium alloy rectangular bars meets the requirements of a circular economy, reducing production costs and environmental impact. In the future, with the advancement of intelligent manufacturing and lightweighting technologies, hot-extruded magnesium alloy rectangular bars will play a vital role in more precision machinery and high-end equipment, with enormous market potential.
