Multi-Axis Milling Toolpath Control for Smooth Tool Axis Vectors
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Solution Overview
Problem
Multi-axis milling is time-consuming and inefficient due to challenges in determining tool axis vectors, leading to uneven material removal and undesirable machining conditions, especially when transitioning from 3-axis to multi-axis toolpaths.
Innovation Solution
The technology creates a domain mapping and defines constraints to determine tool axis vectors, allowing for smooth changes in tool angle and direction, enabling high-performance multi-axis toolpaths with increased material removal rates by using finite element methods and energy minimization to optimize tool axis vector directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-axis toolpaths are used to remove material efficiently, then material removal rate is improved, but determining tool axis vectors becomes complex and time-consuming
Solution Approach 1:
The patent applies preliminary action by pre-defining a finite element mesh over the workpiece surface and pre-determining tool axis vector directions at each mesh element before actual machining. This allows the complex computational geometry work to be completed in advance, so that during multi-axis milling, the pre-computed tool axis vectors can be directly applied, eliminating the need for real-time complex calculations and enabling high material removal rates without the usual computational burden
Solution Approach 2:
The patent introduces a finite element mesh as an intermediary structure between the workpiece geometry and the toolpath generation. This mesh serves as a computational scaffold that simplifies the determination of tool axis vectors by providing a structured framework. Instead of directly computing complex tool orientations on the raw workpiece surface, the system uses the finite element mesh elements as intermediaries to define and calculate tool axis vectors, significantly reducing computational complexity
2Productivity
If aggressive machining parameters are used to increase material removal rate, then productivity is improved, but machining quality and surface finish may deteriorate
Solution Approach 1:
The patent applies local quality by allowing different tool axis vector directions to be defined for each finite element mesh element across the workpiece surface. This enables locally optimized machining paths where the tool orientation can be precisely tailored to each specific location's geometric requirements. As a result, aggressive machining parameters can be used overall while maintaining local surface quality control, because each area is machined with optimally oriented tool vectors suited to its specific geometry
3Productivity
If 3-axis motion is used to remove bulk material, then material removal efficiency is improved, but the remaining material does not closely represent the net shape, requiring additional multi-axis toolpaths
Solution Approach 1:
The patent applies universality by creating a single multi-axis toolpath that can simultaneously perform both bulk material removal and precise net-shape machining. The finite element mesh-based approach allows the toolpath to efficiently remove material while maintaining close proximity to the final part geometry throughout the process. This eliminates the need for separate 3-axis bulk removal passes followed by multi-axis finishing passes, as one unified toolpath accomplishes both functions, saving significant programming time and reducing total machining time
Data Source
AI summary
Technology for milling selected portions of a workpiece by a cutting tool of a numerical control machine is described. The described technology provides methods and apparatuses for milling areas of a part so that more aggressive machining parameters can be used in the toolpath, thereby resulting in reduced machining time and load. The described technology additionally determines directions of the tool axis vector at points along a toolpath in order to achieve a desired part shape while optionally maintaining high material removal rates.