基于Simufact的强力热旋压连杆衬套成形精度研究

Study on forming accuracy of hot power spinning connecting rod bushing based on Simufact

为了研究强力热旋压中不同工艺参数对成形精度的影响规律,改善热旋件的成形质量,选取减薄率、旋压温度、进给比和芯轴预热温度为变量因子,外圆度误差、壁厚偏差、直线度误差和内圆度误差为评价指标,设计了正交试验。利用Simufact有限元仿真软件对连杆衬套进行了热旋数值模拟,通过极差分析和灰色关联法,得出了一致的影响规律和优化参数,并进行试验验证。结果表明:强力热旋压连杆衬套时,减薄率和进给比是影响成形精度的主要因素,芯轴预热温度为次要因素,旋压温度对成形精度的影响最小;当减薄率为25%、旋压温度为350℃、进给比0.6 mm·r^-1、芯轴预热温度为200℃时,热旋件成形精度最高,成形质量最好。

To study the influence law of different process parameters of the hot power spinning on forming accuracy and improve the forming quality of hot spun workpieces,taking the thinning ratio,spinning temperature,feeding rate and mandrel preheating temperature as variable factors,the external roundness error,wall thickness deviation,straightness error and internal roundness error as the evaluation indexes,the orthogonal experiment was designed.The hot spinning numerical simulation on connecting rod bushing was carried out by using the finite element simulation software Simufact.By means of range analysis and grey correlation method,the consistent influence rule and optimization parameters were obtained and the experimental verification was carried out.The results show that when the hot power spinning of connecting rod bushing is carried out,the thinning ratio and feeding rate are the main factors affecting the forming accuracy,the mandrel preheating temperature is the secondary factor,and the spinning temperature has the least influence on the forming accuracy.When the thinning ratio is 25%,spinning temperature is 350 ℃,feeding rate is 0.6 mm·r^-1 and mandrel preheating temperature is 200 ℃,the forming accuracy of hot spun workpieces is the highest and the forming quality is the best.