小半径薄壁管内胀推弯成形模拟与实验分析

• 作 者: 孟忠良 卢宇鹏 于江龙
• 机 构: 枣庄学院机电工程学院,湖南永清环保股份有限公司,贵州大学机械工程学院,
• 出 处: 锻压技术
• 发表日期: 2015年04期
• 关键词: 弯曲半径 模具结构 内胀推弯 成形模拟 壁厚变化 薄壁管 椭圆度 仿真分析 成形工艺 滚弯

通过拉弯、滚弯及数控弯曲等传统方法对Φ10 mm×1 mm、Φ20 mm×1 mm、Φ30 mm×1 mm三种规格管件进行弯曲加工实验。针对传统方法加工中出现的断裂、内侧壁厚增厚、外侧壁厚减薄、起皱和椭圆度差等问题设计了推弯模具,利用Deform软件建立了内胀推弯成形模型并进行仿真分析。在模拟过程中,对不同内压下的每一类型的管件采集数据绘制壁厚变化曲线,选取3条波动较小的曲线进行对比,最后确定模拟效果最好的内压值。依据模拟结果,通过实验对3种规格的弯管进行内胀推弯成形实验,结果表明,该方法很好地解决了小半径弯管内外壁厚度不均匀、起皱、断裂等问题。

The bending experiments of three kinds of pipe fittings of Φ10 mm × 1 mm, Φ20 mm × 1 mm, Φ30 mm × 1 mm were carried out by traditional methods such as bending, rolling and numerical bending. In order to solve the problems of traditional methods such as fracture, thickening of medial wall thickness, thinning of lateral wall thickness, wrinkling and ellipticity, the mold of bulge bending was designed. Deform software was used to establish the model of bulge forming and simulation . In the process of simulation, the curve of wall thickness was plotted for each type of pipe under different internal pressures. Three curves with smaller fluctuation were selected for comparison. Finally, the best value of internal pressure for simulation was obtained. According to the simulation results, the experiments of three kinds of elbows with internal expansion and bending are carried out by experiments. The results show that this method can well solve the problems such as uneven thickness, wrinkling and fracture of the inner and outer walls of small radius elbow.