NC Machining Force Adaptation for Tool Deflection Compensation
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Solution Overview
Problem
Existing methods for numerically controlled machining struggle to accurately maintain the predetermined geometry of a workpiece due to tool deflection caused by forces and torques, especially when the workpiece properties deviate from simulated assumptions.
Innovation Solution
A method for operating a numerical controlled machine that involves receiving a sequence of control commands containing simulated interaction parameters, measuring actual interaction parameters during machining, comparing them, and adapting subsequent interaction parameters to counteract tool deflection, thereby ensuring precise machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the numerical machine uses simulated force values to counteract tool deflection, then tool deflection can be compensated, but the machining precision deteriorates when workpiece properties deviate from simulation assumptions
Solution Approach 1:
The patent implements a feedback mechanism where actual force values measured during machining are continuously compared with simulated force values, and the control commands are adapted based on the deviation between these values. This closed-loop feedback system allows the machine to compensate for property deviations dynamically, maintaining machining precision even when workpiece properties differ from simulation assumptions.
Solution Approach 2:
The patent changes the parameter used for deflection compensation from static simulated force values to dynamic actual force values measured during machining. By measuring the actual first force component and using it to determine adapted second force components, the system adapts to real-time variations in workpiece properties, resolving the contradiction between relying on simulation and handling property deviations.
2Manufacturing precision
If the sequence of control commands is adapted based on measured force deviations, then machining precision is improved, but the device complexity increases
Solution Approach 1:
The control unit compares measured actual force values with simulated force values and automatically adapts the control commands based on the deviation. This feedback-based automatic adaptation improves machining precision without requiring complex manual intervention or additional hardware, as the existing control system processes the force data and generates adapted commands.
Solution Approach 2:
The system performs self-adjustment by automatically comparing measured forces with simulated forces and adapting its own control commands without external intervention. The control unit uses the deviation information to determine adapted force components and generate updated control commands, enabling the system to self-correct for property deviations while maintaining simplicity.
Data Source
AI summary
A method for operating a numerical controlled machine comprising receiving a sequence of control commands which, when executed by a numerical controlled machine, cause the numerical controlled machine to machine a workpiece to obtain a predetermined workpiece geometry, wherein the sequence of control commands includes while machining the workpiece based on the received sequence of control commands measuring a value of a first interaction parameter for a first position of the tool, comparing a measured value of the first interaction parameter for the first position of the tool with the simulated value of the first interaction parameter for the first position of the tool, and determining an adapted value of the second interaction parameter for a following position of the tool based on a result of the comparison.