耳环安装零件多工位级进模设计

根据耳环安装零件的结构特点及实际生产的技术要求,进行多工位级进模排样设计。由于耳环安装零件结构不对称,故其排样设计采用对称排结构,导正孔设计在双排中心线处,保证板料在移动过程中的平稳,从而确保板料冲裁、折弯时的强度以及确保送料精度,同时,采用导正销确定步距。该耳环安装零件多工位级进模采用顺装结构,使得工件与废料自然分离,有利于减少人工成本。同时,由于耳环安装零件的精度要求较高,故进行了多个空工位的设计,以确保其成形精度。结果表明,耳环安装零件多工位级进模能满足产品生产要求。该模具的材料利用率高达63.3%,极大地节省了材料。

Misalignment analysis of journal bearing influenced by asymmetric deflection,based on a simple stepped shaft model

The effects of journal misalignment on a journal bearing caused by an asymmetric rotor structure are presented in this study.A new model considering the asymmetric deflection is applied.Also,the thermo-hydrodynamic of the oil film in the journal bearing and straightforward elasticity theory are considered in the analysis.Based on the structure stiffness equivalent characteristic,a simple stepped shaft can reflect the entire complex structure model.The existing lubrication model,which does not consider this angle component,is not very precise for journal bearings.Film pressure,misalignment angle,velocity field,oil leakage,and temperature field were calculated and compared in the journal bearing analysis.The results indicate that bearing performances are greatly affected by misalignment caused by the asymmetric structure.A simple stepped shaft can effectively represent a misaligned journal bearing in a rotor-bearing system.