Citic Dicastal Co., Ltd

Jingru Shen

Lixin Huang

Zuo Xu

Zhihua Zhu

Shiwen Xu

Xiao Liu

Meng Li

Tieqiang Chen

Liguang Xie

Naizheng Hu

Qingzhu Zhang

Decai Kong

The disclosure discloses a high-speed spinning magnesium alloy and a preparation method thereof, the magnesium alloy has Mg&#x2014;Al&#x2014;Zn&#x2014;Mn&#x2014;Sr alloy with a high formability and high strength, and its chemical composition mass percentage is: Al: 2.4-4.5 wt. %; Zn: 0.6-1.2 wt. %; Mn: 0.4-0.6 wt. %; Sr: 0.15-0.3 wt. %; the balance is Mg. The present disclosure adopts the principle that by increasing the content of Mn in the magnesium alloy, a large amount of Mn-rich phase is generated during the alloy preparation process, and the degree of subcooling is controlled so that a fine spherical dispersed nano-scale Mn-rich phase is obtained during the solidification process. The nano-scale Mn-rich precipitate phase can pin the grain boundaries and inhibit the grain boundary migration to refine grains and achieve the effect of improving the strength. The divorced eutectic MgAlphase generated during the casting process will deteriorate the structure, so Sr is added to the alloy, Sr combining with Al to suppress the coarse phase of divorced eutectic MgAl, refine the grains, increase the amount of eutectic, and reduce the risk of thermal cracking of large-size cast bars. In addition, Sr weakens the texture during the high-temperature spinning forming process and reduces the risk of cracking during the spinning tension, which is beneficial to high-speed spinning forming.

Magnesium alloy, preparation method thereof, and process for preparing wheels by using the magnesium alloy

The disclosure discloses a method of producing a magnesium alloy wheel hub, comprises the following steps: step 1, heating a magnesium alloy bar to 350-430&#xb0; C. and keeping the temperature for 20 minutes; step 2, initially forging and forming the bar under a forging press, the forging speed is 6-15 mm/s; step 3, finally forging and forming the bar under a forging press, and the forging speed is 5-8 mm/s; step 4, testing the microstructure and material properties of the final forged blank to obtain the layered material property distribution on the thickness of the blank; step 5, according to the layered material property distribution on the thickness of the blank obtained in step 4, selecting the part that meets the requirements to make a magnesium alloy wheel hub. According to the different properties in the thickness direction of the blank, the spoke orientation of the magnesium alloy wheel can be quickly designed according to the needs, and the magnesium alloy wheel that meets the usage performance can be obtained, which greatly improves the design and processing efficiency.

Method of producing a magnesium alloy wheel hub

A lathe fixture for machining a hub is characterized in that a power chuck () is installed inside a base (), a positioning connecting block () is installed on the power chuck (), a fan-shaped claw () is installed on the positioning connecting block (), a pressing block () is installed on the base (), and a first support plate () is arranged; the shell () is arranged in a back cavity of the base () from bottom to top, the force transmission shaft () penetrates through the base (), the force transmission rod () is fixedly arranged in a groove of the shell (), the first support plate () and the second support plate () are respectively arranged at the front end and the rear end of the shell (), the balance block () is fixed between the first support plate () and the second support plate () through two guide posts (), the spring () is arranged in the groove of the balance block () and the second support plate (), and the cover plate () is fixedly arranged at the lower end of the shell (); the invention provides a clamp with a centrifugal force compensation mechanism.

Lathe fixture for machining hub

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Qinhuangdao, China

Jingru Shen