Spindle clamp and method for numerically controlled milling of helical structures with axis outside the workpiece body

Abstract

The application provides a mandrel clamp and a method for numerically controlled milling of a helical structure with an axis outside a workpiece body by using the clamp. The mandrel clamp is used to install the workpiece on a vertical numerical control milling machine with a dividing head by taking a through hole on the workpiece as a positioning reference. Two helical lines passing through required fixed points are constructed on UG through a helical curve equation. A normal cross-sectional shape of the helical structure is established, and a full-parameterized starting-point helical structure model is created by sweeping the two helical lines. A variable profile milling strategy is used to generate a tool path for machining a helical groove side surface with a tool side edge and a helical bottom surface with a tool tip, without manual compensation. The helical structure is fully milled by using a standard end mill and a standard ball nose end mill, solving the problem that the existing machining method needs to rely on a large amount of manual machining and depends on individual skills to ensure machining quality. The machining efficiency and quality are greatly improved, and the method has strong universality and is suitable for single-piece or batch production. The clamp in the application is simple and has low economic cost.

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