曲轴锻造过程中的金属流动分析与磁痕研究

发布时间：2018-11-07 14:22

【摘要】：针对六拐曲轴进行磁粉探伤分析,观察探伤后磁痕的形貌和分布,采用三维有限元软件Transvalor Forge-3D对曲轴的热锻过程进行数值模拟,研究热锻过程中金属流动对曲轴磁痕的影响。模拟表明,在预锻和终锻过程中,第3、4拐与第1、6拐内侧分模面对应于曲轴的中心金属分布处,而中心金属的圆截面在第2、5拐截面上的横向分布为中心偏上10 mm左右。中心金属流至第1拐和第3拐的内侧圆角处,使得中心金属在经过后续的机加工等工序后,易暴露在工件表面,中心金属材料的外露易诱发裂纹、磁痕等的发生,这是磁痕形成的主要原因之一。结果表明,通过调整模具的预锻尺寸可以避免中心金属材料的暴露,严格控制原材料质量,控制中心金属的缺陷在一定允许范围内,可以避免实际锻造中曲轴内部缺陷的发生。
[Abstract]:The magnetic particle flaw detection analysis of six crank crankshafts was carried out to observe the morphology and distribution of magnetic marks after the inspection. The hot forging process of the crankshaft was simulated by 3D finite element software Transvalor Forge-3D to study the effect of metal flow on the magnetic marks of the crankshaft during the hot forging process. The simulation results show that, in the process of preforging and final forging, the inner parting die of the 3rd and the 1st crank should be located at the center metal distribution of the crankshaft, and the transverse distribution of the circular section of the center metal on the section of the second crankshaft is about 10 mm above the center. The central metal flows to the inner corner of the first and third turns, which makes the center metal easily exposed to the workpiece surface after subsequent machining, and the exposure of the central metal material can easily induce cracks, magnetic marks, etc. This is one of the main reasons for the formation of magnetic marks. The results show that the inner defects of crankshaft can be avoided by adjusting the pre-forging size of die, strictly controlling the quality of raw material and controlling the defect of center metal within a certain range.
【作者单位】：阳江职业技术学院机电系;
【基金】：河南省重点攻关项目(132102210119) 阳江职业技术学院2014年院内教改课题
【分类号】：TG316

【共引文献】