气门顶杆冷挤压过程模具磨损研究
|
摘要
通过分析零件的结构特点,基于气门顶杆的零件图设计出挤压件图。通过Archard磨损模型分析了模具磨损原因。利用DEFORM-3D的数值模拟功能分析了摩擦因数、成形速度和模具硬度对冷挤压成形过程中模具磨损的影响。结果显示:摩擦因数越低,磨损量越小,为了节约成本和简化润滑过程,选择摩擦因数接近0.1的模具磨损量较小且满足工艺要求;成形速度在30mm/s时,凹模磨损量最小,凸模磨损量较低;模具硬度增高,磨损量减小,模具硬度在接近60HRC时磨损量较小且性能稳定。数值模拟的结果为实际生产中加工工艺参数的选取提供了一定的理论指导。
By analyzing the structural characteristics of the valve stem,the extruded blank is designed.The causes of mold wear are analyzed by use of Archard wear model.Using the numerical simulation function of DEFORM-3 D,the influences of friction coefficient,forming speed and die hardness on the die wear are analyzed in the course of cold extrusion.The results show that the lower the friction coefficient is,the smaller the amount of wear is.In order to save the costs and simplify the lubrication process,when the friction coefficient is selected to be about 0.1,the wear of the mold is small and meets the process requirements;when the forming speed is 30 mm/s,the wear of the die is the smallest and the punch wear is low.The hardness of the die increases continuously,the wear amount decreases,the wear of the die whose hardness is around 60 HRC is small and the performance is stable.The results of numerical simulation has provided a theoretical guidance for the selection of processing parameters in actual production.
By analyzing the structural characteristics of the valve stem,the extruded blank is designed.The causes of mold wear are analyzed by use of Archard wear model.Using the numerical simulation function of DEFORM-3 D,the influences of friction coefficient,forming speed and die hardness on the die wear are analyzed in the course of cold extrusion.The results show that the lower the friction coefficient is,the smaller the amount of wear is.In order to save the costs and simplify the lubrication process,when the friction coefficient is selected to be about 0.1,the wear of the mold is small and meets the process requirements;when the forming speed is 30 mm/s,the wear of the die is the smallest and the punch wear is low.The hardness of the die increases continuously,the wear amount decreases,the wear of the die whose hardness is around 60 HRC is small and the performance is stable.The results of numerical simulation has provided a theoretical guidance for the selection of processing parameters in actual production.
引文
[1]褚忠,瞿伟,刘铭心,等.冷挤压模具磨损优化设计[J].铸造技术,2017,38(12):2895-2899.
[2]黄瑶,孙宪萍,王雷刚,等.基于BP神经网络的挤压模具磨损预测[J].塑性工程学报,2006(2):64-66.
[3]Lee R S,Jou J L.Application of numerical simulation for wear analysis of warm forging[J].Journal of Materials Processing Technology,2003,140(1/3):43-48.
[4]Kang J H,Park I W,Jae J S,et al.A study on a die wear model considering thermal softening(I):Construction of the wear model[J].Journal of Materials Processing Technology,1999,96(1/3):53-58.
[5]周杰,赵军,安治国.热挤压模磨损规律及磨损对模具寿命的影响[J].中国机械工程,2007(17):2112-2115.
[6]郑伟刚,尹存宏,杨宁,等.基于Archard的正挤压模具磨损模拟分析与研究[J].锻压技术,2013,38(5):148-151.
[7]刘华伟,田福祥.气门顶杆冷挤压模设计[J].模具工业,2010,36(5):64-66.
[8]孙家枢.金属的磨损[M].北京:冶金工业出版社,1992.
[9]胡建军,李小平.DEFORM-3D塑性成形CAE应用教程[M].北京:北京大学出版社,2011.
[2]黄瑶,孙宪萍,王雷刚,等.基于BP神经网络的挤压模具磨损预测[J].塑性工程学报,2006(2):64-66.
[3]Lee R S,Jou J L.Application of numerical simulation for wear analysis of warm forging[J].Journal of Materials Processing Technology,2003,140(1/3):43-48.
[4]Kang J H,Park I W,Jae J S,et al.A study on a die wear model considering thermal softening(I):Construction of the wear model[J].Journal of Materials Processing Technology,1999,96(1/3):53-58.
[5]周杰,赵军,安治国.热挤压模磨损规律及磨损对模具寿命的影响[J].中国机械工程,2007(17):2112-2115.
[6]郑伟刚,尹存宏,杨宁,等.基于Archard的正挤压模具磨损模拟分析与研究[J].锻压技术,2013,38(5):148-151.
[7]刘华伟,田福祥.气门顶杆冷挤压模设计[J].模具工业,2010,36(5):64-66.
[8]孙家枢.金属的磨损[M].北京:冶金工业出版社,1992.
[9]胡建军,李小平.DEFORM-3D塑性成形CAE应用教程[M].北京:北京大学出版社,2011.