某壳体组件石墨衬套孔加工工艺改进

Improvement of Processing Technology of Graphite Bushing Holes in Shell Components

某壳体组件是某发动机中的核心关键零件,该组件加工质量的好坏直接影响着产品故障率的高低。随着新制产品和大修任务量的逐年增加,原来的加工质量和加工效率已经无法满足产品的交付需求,急需提高零件的加工质量和加工效率。该壳体组件中含有3组石墨衬套孔,孔径公差小,形位公差严,加工难度大。原工艺安排钻模对3组孔进行加工,通过扩孔、铰孔保证石墨衬套孔的尺寸和形位公差要求,零件的加工质量受制于钻模、刀具的制造精度,零件合格率低,返工率高,造成了极大的浪费。在现场加工改进过程中,通过更换加工设备,优化工装、刀具,并选用合理的切削参数,从而提高了零件的加工效率和加工质量。

A shell component was the core and key part of an engine,and the good or bad processing quality of the component directly affected the level of product failure rate.With the new products and overhaul tasks having increased year by year,the original processing quality and processing efficiency has been unable to meet the delivery needs of products,which urgently needed to improve the processing quality of parts and machining efficiency.The shell component contained three groups of graphite bushing holes,which had small aperture tolerance,strict form tolerance and great processing difficulty.Through chambering and reaming to ensure the dimension and shape tolerance of graphite bushing hole with drill plate processing three group holes according to original process.The machining quality of the parts was restricted by the manufacturing precision of the drilling die and cutting tool,which led to the qualified rate of parts be low and the rework rate be high,and resulted in great waste.In the process of machining improvement,machining efficiency and machining quality were improved by changing machining equipment,optimizing tooling and cutting tools,and selecting reasonable cutting parameters.