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通过对镁合金自行车曲柄等温闭式锻造过程进行数值模拟,揭示自行车曲柄锻造变形过程中的金属流动规律,分析速度场和凸模行程载荷曲线的特点。其成形过程分为4个阶段:弯曲变形阶段、杆身压扁阶段、填充型腔阶段和最终成形阶段。研究了温度及工作速度对镁合金等温锻造过程的影响,结果显示,在350℃左右的等温环境,凸模的工作速度为3mm.s-1左右较适合镁合金自行车曲柄等温闭式锻造。
Through the numerical simulation of isothermal closed forging process of magnesium alloy bicycle crank, the law of metal flow during the forging deformation of bicycle crank is revealed, and the characteristics of speed field and punch load curve are analyzed. The forming process is divided into four stages: bending deformation stage, shaft crushing stage, filling cavity stage and the final forming stage. The effects of temperature and working speed on the isothermal forging process of magnesium alloy were studied. The results showed that the working speed of the punch at about 350 ℃ is about 3mm.s-1, which is more suitable for isothermal closed forging of magnesium alloy bicycle crank.