Numerical Control Workspace-Dependent Parameter Adaptation
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Solution Overview
Problem
Numerical controls for machine tools face challenges in adapting to individual machines with multiple axes, requiring complex parameterization to optimize performance and stability, especially in handling geometry errors and mechanical resonances across varying workspaces.
Innovation Solution
The introduction of user-defined functions that allow for the manipulation of machine parameters and control values, enabling adaptive compensation for geometry errors and resonance damping through user-configurable controller structures and parameter settings, which can be easily edited without deep programming knowledge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the numerical control is adapted to individual machine tools with complex parameterization, then the manufacturing precision and stability are improved, but the device complexity and difficulty of operation increase
Solution Approach 1:
The patent implements a workspace-dependent parameter adaptation mechanism where control parameters are automatically adjusted based on the current workspace coordinates. The system divides the workspace into multiple regions, each with optimized parameters for positioning accuracy and stability. This eliminates the need for complex manual parameterization while maintaining high precision across different working areas.
Solution Approach 2:
The numerical control system automatically selects and adjusts parameters based on the current workspace position without requiring manual intervention. The controller self-adapts to different machine configurations and workspace conditions by retrieving pre-stored parameter sets corresponding to different workspace regions, thereby simplifying operation while maintaining precision.
2Stability of the object's composition
If filters are added to dampen mechanical resonances, then the stability is improved, but the response speed decreases
Solution Approach 1:
The patent applies different filter characteristics to different workspace regions rather than using a uniform filter across the entire workspace. In regions where mechanical resonances are prominent, stronger filtering is applied to ensure stability. In regions where rapid response is critical and resonance is minimal, filtering is reduced or bypassed entirely, thereby maintaining high response speed while ensuring stability where needed.
Solution Approach 2:
The filter parameters are dynamically adjusted based on the current workspace position and motion conditions. The system automatically modifies filter cutoff frequencies and damping coefficients in real-time according to the active workspace region and current velocity, optimizing the balance between stability and response speed for each specific operating condition.
3Manufacturing precision
If amplification factors are increased to improve positioning precision, then the manufacturing precision is improved, but the mechanical instabilities increase
Solution Approach 1:
The patent implements workspace-dependent amplification factor adjustment where the gain parameters of the control loops are automatically modified based on the current workspace region. In regions prone to mechanical resonances, amplification factors are reduced to minimize instability. In regions where high precision is critical and resonance is minimal, amplification factors are increased to enhance positioning accuracy, thereby optimizing the balance between precision and stability for each workspace area.
Data Source
AI summary
A numerical control for operating a machine tool having a plurality of axes, includes a drive controller for each axis to be actuated, the drive controllers being able to be parameterized via machine parameters and thus adaptable to the most varied applications. Variable control values and machine parameters are selectable via tapping points in the drive controllers in order to be used as arguments or parameters of a user-defined function for calculating an output value, which is used for function-dependent influencing of one of the drive controllers.