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微小整体叶轮作为微型发动机的重要组成部分,其加工质量直接影响微型发动机的使用性能。针对微小整体式复杂叶轮流道狭窄、叶片扭曲大和长厚比大等特点,开展了微小复杂扭曲整体式叶轮五轴联动微细铣削加工方法研究。针对微小叶轮加工过程极易发生变形、过切和碰撞干涉等问题,对微小叶轮的加工过程进行工艺规划,建立了微小叶轮流道加工刀具选择的约束方程,计算出叶轮加工刀具的最大理论直径。通过CAM软件对叶轮进行切削仿真,验证了刀具选择和工艺规划的正确性。通过五轴联动微细铣削试验,得到了具有6个直径10mm的叶片、叶片最小厚度0.15mm、叶片最小相邻间距0.58mm的7075铝合金微小整体叶轮。
As a miniature miniature impeller impeller an important part of its processing quality directly affects the performance of micro-engine performance. In view of the characteristics of small integrated complex impeller, such as narrowing of runner, large blade twist, and long / thick ratio, the research on the micro-complicated micro-milling process of the integrated impeller with five axes is carried out. Aiming at the problems such as deformation, overcut and collision interference, the machining process of the micro impeller is planned, and the constraint equation of the micro-impeller flow path machining tool selection is established. The maximum theoretical diameter of the impeller machining tool is calculated . The simulation of the impeller by CAM software verified the correctness of tool selection and process planning. Through the micro-milling test of five-axis linkage, a 7075 aluminum alloy miniature integral impeller with six blades with a diameter of 10mm, a minimum blade thickness of 0.15mm and a minimum blade pitch of 0.58mm was obtained.