To study the residual stress of the special coating at different cutting speeds, the cutting of FeA1CrBSiNb coating is analyzed with the finite element method （FEM） and experiment according to the coating characteri...To study the residual stress of the special coating at different cutting speeds, the cutting of FeA1CrBSiNb coating is analyzed with the finite element method （FEM） and experiment according to the coating characteristics. The CNC machine tool is used to cut the coating and the X-ray stress equipment is used to measure the residual stress of coating. The experimental and FEM results agree with each other. Also, the residual-stress coating depth is deeper and the residual stress of the coating surface is larger with increasing cutting speed. In addition, the residual stress of the coating surface is in the suppression state affected by axial residual stress and circumferential residual stress, and the residual stress of the deeper coating is in the tensile state based on the original state of arc spraying and cutting process.展开更多
针对转运系统转载物料过程中料斗衬板的磨损影响运输效率的问题,改用新型钢基陶瓷复合衬板来代替传统耐磨钢,采用离散元法(distinct element method,DEM)描述颗粒物料运动过程,通过Archard磨损模型分析预测不同工况条件下衬板磨损规律,...针对转运系统转载物料过程中料斗衬板的磨损影响运输效率的问题,改用新型钢基陶瓷复合衬板来代替传统耐磨钢,采用离散元法(distinct element method,DEM)描述颗粒物料运动过程,通过Archard磨损模型分析预测不同工况条件下衬板磨损规律,并通过磨损规律和磨损特征验证了磨损模型的合理性。基于DEM的有限元法(finite element method,FEM)耦合方法分析了衬板应力与变形特性。研究结果表明:料斗衬板的最大磨损深度随颗粒度增大而减小,随传送带带速、衬板安装高度、衬板安装倾角的增大而增大。结合实际来看,衬板在粒径25mm、带速2.8m/s、高度3000mm、角度60°的工况下磨损最小。铁矿石散料对衬板的摩擦和冲击作用造成的应力较大的位置主要集中在衬板连接的螺栓孔周围,磨损最严重的位置多为颗粒与衬板优先接触区域,因此,为了降低应力集中,应该在衬板连接处加强螺栓孔的强度并进行圆角设计。展开更多
文摘To study the residual stress of the special coating at different cutting speeds, the cutting of FeA1CrBSiNb coating is analyzed with the finite element method （FEM） and experiment according to the coating characteristics. The CNC machine tool is used to cut the coating and the X-ray stress equipment is used to measure the residual stress of coating. The experimental and FEM results agree with each other. Also, the residual-stress coating depth is deeper and the residual stress of the coating surface is larger with increasing cutting speed. In addition, the residual stress of the coating surface is in the suppression state affected by axial residual stress and circumferential residual stress, and the residual stress of the deeper coating is in the tensile state based on the original state of arc spraying and cutting process.
文摘针对转运系统转载物料过程中料斗衬板的磨损影响运输效率的问题,改用新型钢基陶瓷复合衬板来代替传统耐磨钢,采用离散元法(distinct element method,DEM)描述颗粒物料运动过程,通过Archard磨损模型分析预测不同工况条件下衬板磨损规律,并通过磨损规律和磨损特征验证了磨损模型的合理性。基于DEM的有限元法(finite element method,FEM)耦合方法分析了衬板应力与变形特性。研究结果表明:料斗衬板的最大磨损深度随颗粒度增大而减小,随传送带带速、衬板安装高度、衬板安装倾角的增大而增大。结合实际来看,衬板在粒径25mm、带速2.8m/s、高度3000mm、角度60°的工况下磨损最小。铁矿石散料对衬板的摩擦和冲击作用造成的应力较大的位置主要集中在衬板连接的螺栓孔周围,磨损最严重的位置多为颗粒与衬板优先接触区域,因此,为了降低应力集中,应该在衬板连接处加强螺栓孔的强度并进行圆角设计。
