机械设计制造及其自动化专业外文翻译--离心叶轮综合加工方法.doc

外文原文
An Integrated Machining Approach for a Centrifugal Impeller
H.-T. Young and L.-C. Chuang
Department of Mechanical Engineering, National Taiwan University, Taiwan
When a 3-C machining centre is used for producing an impeller, great difficulties, . collisions between the cutting tool and the impeller, can occur. The blade of an impeller is usually designed with a ruled surface. As the surface is normally twisted in design to achieve the required performance, it can cause overcut and collision problems during machining. The hub of the impeller is usually designed with an irregular surface, and is machined within a narrow and deep groove. The issues – how to satisfy the quality requirements of the part, reduce the machining time, and avoid the occurrence of collision – e an integral problem. This work develops an integrated 5-axis machining module for a centrifugal impeller bining related machining technologies. As a result, cutter location (CL) data based on the geometric model of blade and hub are generated. Finally, the CL data are confirmed through software simulation. The results of verification show that the machining methodology and procedure adopted are essful.
Keywords: CAM; 5-C; 5-axis Machining; Impeller; Tool-path Planning
1. Introduction
Five-puter numerical controlled (CNC) machines are widely used to produce aerospace parts, turbine impellers, and machining dies. These parts usually plex geometry which is represented by parametric or freeform surfaces. As an improvement over 3-axis machining, 5-axis machining offers advantages such as higher productivity and better machining quality. In 5-axis machining, the tool axis has two additional degrees of freedom, allowing a more efficient tool path. The centrifugal impeller is a good demonstration of the efficient designing and manufacturing capabilities of 5-axis machining. The surface model of the impeller is designed with an extremely twisted surface and its blades overlap with each other subst