A Multi-Scale Tool Orientation Generation Method for Freeform Surface Machining with Bull-Nose Tool

Area of Science:

• Manufacturing Engineering
• Computer-Aided Manufacturing (CAM)
• Surface Metrology

Background:

• Free-form surfaces are vital in industries like aerospace and automotive, requiring high-precision machining.
• Five-axis computer numerical control (CNC) machining demands precise tool orientation for efficiency and accuracy.
• Existing methods often struggle to balance macro- and micro-scale surface quality requirements.

Purpose of the Study:

• To propose a novel multi-scale tool orientation generation method for free-form surface machining.
• To address the need for simultaneous control over machining strip width (macro-scale) and surface roughness (micro-scale).
• To ensure smooth tool paths and prevent interference during the machining process.

Main Methods:

• Analysis of the correlation between tool orientation and rotational axis.
• Development of feasible area calculation and tool orientation adjustment techniques.
• Implementation of macro-scale machining strip width and micro-scale roughness calculation methods.
• Integration of scale-specific adjustment methods into a unified multi-scale generation approach.

Main Results:

• The proposed multi-scale method successfully generated tool orientations that met both macro- and micro-scale requirements.
• Experimental verification on a free-form surface demonstrated achievement of target machining strip width and roughness.
• The method ensures smooth tool orientation and avoids machining interference.

Conclusions:

• The developed multi-scale tool orientation generation method is effective for high-precision machining of free-form surfaces.
• This approach offers significant potential for improving workpiece surface quality in industrial applications.
• The method provides a robust solution for balancing competing machining requirements at different scales.