【摘要】 清根加工作为叶轮拐角区域残余材料的补加工工艺，在整体叶轮数控加工中占据十分重要的地位。盖盘叶轮清根加工具有推刀进给、拐角曲面曲率大、切削余量大、空间几何受限等特点。而传统球头铣刀刀尖点切削性能不足，应用于盖盘叶轮清根加工会导致切削载荷大和切屑挤压，造成刀具过早失效、加工表面质量差等问题。本文针对盖盘叶轮清根加工的特点和难点，提出一种面向不同拐角尺寸的具有削顶结构以及大容屑槽结构的刀具，并推导了切削刃的表达式。对传统球头铣刀和新式削顶铣刀进行仿真与实验，结果表明，新式削顶铣刀较传统球头铣刀切削力降载高达77.6%,切削过程更平稳可靠，加工质量更高。更多还原

【Abstract】 As a complementary machining process for residual material in the impeller corner area, root cleaning plays a very important role in the overall impeller CNC machining.The root cleaning of cover impeller has the characteristics of push tool feed, large curvature of corner surface, large cutting allowance and space geometry limitation.The tip cutting performance of traditional ball-ended milling cutter is not enough, and the application of the cover impeller′s root cleaning processing will lead to large cutting load, chip extrusion, and eventually lead to premature tool failure, poor surface quality and other problems.In this paper, a tool with a cutting top structure and a large chip holder structure for different corner sizes is proposed to address the characteristics and difficulties of cover impeller′s root cleaning and derive the expressions of its cutting edges.Simulations and experiments are set up for the traditional ball end mill and the new cutting top milling cutter.The results show that the new cutting top milling cutter reduces the cutting force up to 77.6% compared with the traditional ball end mill, and the cutting process is more smooth and reliable with higher machining quality.更多还原