一、概述赛车型自行车的轴壳(见图1),一般均为整体结构的铝合金制件,花盘的最大直径为60,比普通自行车花盘的最大直径约大10mm。按常规先用自由锻造制坯,然后进行车削加工,但是由于铝合金的锻造温度范围比较小,而且铝的导热性比较好,所以自由锻造毛坯的难度较高,经济效益也不比直接用棒料车成零件好。因此,目前大多数厂都采用φ65铝棒直接车削成零件,浪费了大量时间和材料,而且切断了金属材料的纤维,降低了零件的机械性能,亦难以适应成批或大量生产的要求。为探求一个比较理想的加工方案,我们进行了反复的实验和研究,在较短的时间里,顺利地完成了铝合金前、后轴壳的等温锻造工艺试验,现已投入成批 First, an overview Motorcycle bicycle axle shell (see Figure 1), are generally the overall structure of the aluminum parts, the maximum diameter of the face plate is 60, compared with the average diameter of the bicycle disc about 10mm. According to the conventional first free forging billet, and then turning, but due to the forging temperature range of aluminum alloy is relatively small, and the thermal conductivity of aluminum is relatively good, so free forging rough more difficult, economic benefits than direct use of bar Car into parts is good. Therefore, most of the plants currently use φ65 aluminum bar directly turning into parts, wasting a lot of time and materials, and cut off the metal fiber, reducing the mechanical properties of the parts, it is difficult to meet the batch or mass production requirements. In order to explore a more ideal processing program, we conducted repeated experiments and studies, in a relatively short period of time, successfully completed the isothermal forging of aluminum alloy front and rear axle shell test, has been put into bulk