连杆衬套温挤压预成形技术及数值模拟研究

发布时间：2018-05-27 02:24

  本文选题：连杆衬套 + 锡青铜　； 参考：《中北大学》2017年硕士论文

【摘要】：本文以锡青铜连杆衬套预成形坯料为研究对象,依据连杆衬套坯料温挤压成形原理和锡青铜材料的特点,选择了温挤压成形方式。采用这种成形方式,挤压件的变形抗力低、尺寸精度高、表面质量高、力学性能好,被广泛的应用于特殊工艺要求的挤压成形。详细的对连杆衬套温挤压塑性成形基本原理进行了理论分析,给连杆衬套温挤压有限元模拟提供了理论基础和依据。温挤压成形工艺参数直接影响挤压产品的成形质量,利用有限元软件DEFORM-3D对连杆衬套温挤压预成形技术进行了数值模拟研究,分析了温挤压工艺参数对坯料成形的影响规律,得到了温挤压温度、温挤压速度、摩擦系数等工艺参数在温挤压过程中对挤压筒形件的等效应变、等效应力、挤压力、损伤值的影响规律。采用正交试验法重点分析了温挤压工艺参数对挤压筒形件的等效应力、等效应变、挤压力、损伤值影响的显著性大小,得出了工艺参数对目标值的影响顺序。利用极差分析法对温挤压工艺参数的影响显著性大小做了定量的分析得到了一组合理的工艺参数,即温挤压温度为700℃、温挤压速度为5 mm/s、摩擦系数数为0.1,根据连杆衬套温挤压模拟试验验证了使用优化后的工艺参数制造出的成形件表面质量高。根据连杆衬套坯料温挤压成形加工成形的特点,选择了反挤压作为温挤压成形方式,理论分析计算了预热后坯料和挤压完成后筒形件的尺寸,为温挤压模具的设计提供理论依据。通过对连杆衬套坯料温挤压成形难点的分析和研究,结合正交优化和仿真模拟的结论,制定出了一套合理的连杆衬套温挤压成形方案。重点对发动机连杆衬套坯料的温挤压成形工艺进行了研究,通过合理的控制坯料预热温度、模具预热温度、温挤压润滑等条件能够加工出性能优越的成形工件,并以此为依据设计出带有保温控制系统、自动顶料装置的双层组合预应力挤压模具。
[Abstract]:In this paper, the preformed billet of tin bronze connecting rod bushing is taken as the research object. According to the warm extrusion forming principle of connecting rod bushing blank and the characteristics of tin bronze material, the warm extrusion forming method is selected. With this forming method, the extrusion parts have low deformation resistance, high dimensional precision, high surface quality and good mechanical properties, so they are widely used in extrusion forming with special process requirements. The basic principle of warm extrusion plastic forming of connecting rod bushing is analyzed in detail, which provides a theoretical basis and basis for the finite element simulation of warm extrusion of connecting rod bushing. Warm extrusion process parameters directly affect the forming quality of extrusion products. The numerical simulation of warm extrusion preforming technology for connecting rod bushing is carried out by using finite element software DEFORM-3D, and the influence of warm extrusion process parameters on blank forming is analyzed. The effects of temperature, velocity and friction coefficient on the equivalent strain, equivalent stress, extrusion pressure and damage value of the extruded cylinder are obtained. The orthogonal test method is used to analyze the significance of the influence of the process parameters of warm extrusion on the equivalent stress, equivalent strain, extrusion pressure and damage value of the extruded cylinder, and the order of the effects of the process parameters on the target value is obtained. By means of the range analysis method, the influence of the temperature extrusion parameters on the technological parameters is quantitatively analyzed and a set of reasonable technological parameters are obtained, that is, the temperature of warm extrusion is 700 鈩，

本文编号：1940023