一、情况介绍我厂生产的长江-750摩托车,其前叉减震弹簧的技术要求较高,除了保证弹性外,还要求具有较高的疲劳寿命,保证行车15000公里以上,弹簧不致于疲劳折断。前叉弹簧的几何尺寸如图1所示,选用50CrVA优质弹簧钢丝。其具体技术要求如下: 1.热处理后硬度为HRC45～52; 2.热处理后全压缩保持12小时,然后检查总圈数16±0.25圈; 3.用磁力探伤法100％检查弹簧是否有 First, the situation introduced I plant in the Yangtze River -750 motorcycles, the front fork shock absorption spring high technical requirements, in addition to ensuring flexibility, but also requires a higher fatigue life, to ensure that driving more than 15,000 kilometers, the spring will not fatigue Break. Front fork spring geometry shown in Figure 1, the choice of high-quality spring steel wire 50CrVA. The specific technical requirements are as follows: 1. After heat treatment HRC45 ~ 52; 2. After heat treatment, the whole compression for 12 hours, and then check the total number of laps 16 ± 0.25 laps; 3. Magnetic testing method 100% check whether the spring