吉林大学学报(工学版) ›› 2017, Vol. 47 ›› Issue (3): 861-868.doi: 10.13229/j.cnki.jdxbgxb201703024

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36MnVS4连杆裂解加工模拟及缺陷分析

寇淑清, 宋玮峰, 石舟   

  1. 吉林大学 辊锻工艺研究所,长春 130022
  • 收稿日期:2016-04-27 出版日期:2017-05-20 发布日期:2017-05-20
  • 作者简介:寇淑清(1962-),女,教授,博士生导师.研究方向:精密制造技术及自动化.E-mail:kousq@jlu.edu.cn
  • 基金资助:
    国家重点研发计划项目(2016YFD0701102); 国家科技重大专项项目(2013ZX04002021)

Fracture splitting simulation and defect analysis of 36MnVS4 connecting rod

KOU Shu-qing, SONG Wei-feng, SHI Zhou   

  1. Roll Forging Institute, Jilin University, Changchun 130022, China
  • Received:2016-04-27 Online:2017-05-20 Published:2017-05-20

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摘要： 针对具有更高疲劳强度的连杆新材料36MnVS4,开展了连杆裂解加工性能研究,并与C70S6材料进行对比,探究其裂解缺陷形成原因。依据新材料I型裂纹的脆性解理断裂特性,确定了连杆裂解K判据及最大主应力断裂失效准则,建立了预制切口条件下的连杆裂解有限元模型。通过分析裂解过程中的应力集中和变形分布情况,获得不同材料的切口起裂位置和时间、切口附近及断面的塑性变形,结合裂纹扩展速度和裂解载荷,研究了容易导致的缺陷类型并评估了断口质量。结果表明:在相同几何参数和载荷下,因36MnVS4连杆较C70S6起裂位置分散、裂纹扩展不稳定、缺口敏感性高、铁素体组织多,容易导致批量生产时裂解工序缺陷增加,但裂解后大头孔失圆和断面塑性变形小。

关键词: 材料合成与加工工艺, 36MnVS4, 连杆, 裂解加工, 数值模拟

Abstract: In view of new material 36MnVS4 with higher fatigue strength, the fracture splitting performance of the connecting rod was studied in comparison with C70S6, and reason of the fracture splitting defects was analyzed. In term of the brittle cleavage fracture feature of the new material mode I crack, the K criterion and the maximal principal stress failure criterion were determined. Meanwhile, the splitting Finite Element Model (FEM) of connecting rod was established with starting notch. By observing the stress concentration zone and the deformation distribution of the fracture splitting process, the crack initial position and time of the connecting rod and the plastic deformation of the notch and big-end in fracture surface were acquired. Considering the crack propagation velocity and the cracking load, the main defects were investigated and the fracture mass was evaluated. Results show that, under the same geometrical parameters and load, compared with the C70S6, the 36MnVS4 connecting rod production has more defects in the fracture splitting process because that the initial position of the crack is scattered, the crack propagation is instable, the notch sensitivity is high and there are more ferrites. However, the new material has a lower out-of-rounding as big-end hole and a smaller fracture surface plastic deformation after the fracture splitting.

Key words: materials systhesis and processing technology, 36MnVS4, connecting rod, fracture splitting, numerical simulation

中图分类号: 

  • TK406
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