镶铸法制备双金属复合耐磨轧辊的凝固过程的数值模拟

发布时间：2018-06-15 07:26

  本文选题：镶铸法 + 轧辊　； 参考：《昆明理工大学》2017年硕士论文

【摘要】：轧辊在耐磨行业中的运用比较广泛,相对于单一材料的轧辊,双金属复合轧辊的耐磨性能更好,使用寿命更长。以前,研究人员对轧辊的研究主要集中在单一材料上,或者是对双金属复合轧辊的凝固过程进行实验研究,运用数值模拟方法对双金属复合轧辊凝固过程进行理论研究的较少。本文运用ANSYS有限元软件对镶铸法制备双金属复合耐磨轧辊的凝固过程进行了数值模拟,主要包括凝固过程温度场的模拟和凝固过程应力场的模拟。本文研究了在三种不同的浇注温度下(1300℃、1400℃、1500℃),双金属复合耐磨轧辊凝固过程的温度场和热应力场,通过对模拟的结果分析表明,浇注温度越高,凝固的速度越缓慢,热应力也越大,也越容易出现缩孔缩松等缺陷;浇注温度偏低,凝固速度快,也会导致铸件凝固过程不均匀等问题。所以在铸件实际的浇注过程中选取浇注温度为1400℃,可以有效地防止缩孔的产生。同时研究了三种不同形状的辊芯对双金属复合耐磨轧辊凝固过程的温度场和应力场的影响,通过对模拟的结果分析表明,在凝固初期,辊芯形状对铸件凝固过程的温度场分布影响较小;在凝固中期,长方体辊芯的铸件的凝固速度最快,六棱柱辊芯的铸件的凝固速度最慢,圆柱体辊芯的铸件的凝固速度较为适宜。六棱柱辊芯的铸件受到的热应力大于长方体辊芯的铸件受到的热应力,长方体辊芯的铸件受到的热应力大于圆柱体辊芯的铸件受到的热应力。本文运用Abaqus对凝固过程的温度场和应力场进行了验证性模拟,结果表明Abaqus模拟计算的结果与ANSYS计算的结果一致,从仿真模拟的角度验证了ANSYS对双金属复合耐磨轧辊凝固过程温度场和应力场模拟的准确性和可靠性。同时对ANSYS模拟之后的参数进行了优化,将优化之后的参数运用到验证性实验当中,通过实验浇注出来的铸件与ANSYS模拟优化之后的结果比较吻合,从实验的角度验证了 ANSYS对双金属复合材料进行数值模拟的准确性和可靠性,说明数值模拟技术对实际的铸造工艺具有一定的指导意义。
[Abstract]:The roll is widely used in the wear-resistant industry. Compared with the single material roll, the bimetallic compound roll has better wear resistance and longer service life. In the past, researchers mainly focused on a single material, or the solidification process of bimetallic composite roll was studied experimentally, but few of them studied the solidification process of bimetallic compound roll by numerical simulation method. In this paper, the numerical simulation of solidification process of bimetallic composite wear resistant roll prepared by inlay casting method is carried out by using ANSYS finite element software, including the simulation of temperature field during solidification process and the simulation of stress field during solidification process. In this paper, the temperature field and thermal stress field of bimetallic composite wear resistant roll during solidification are studied under three different pouring temperatures. The results of simulation show that the higher the pouring temperature, the slower the solidification rate. The larger the thermal stress is, the more easily the defects such as shrinkage and porosity will occur, and the lower pouring temperature and the faster solidification speed will lead to the inhomogeneous solidification process of castings. Therefore, the casting temperature of 1400 鈩，

本文编号：2021211