CNC Workpiece Support Kinematics for High-Feed Vibration Control
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Solution Overview
Problem
The EHLA process requires high feed rates, leading to high accelerations when changing the direction of movement, especially for non-rotationally symmetrical bodies, causing vibration and inefficiencies in CNC machines.
Innovation Solution
A CNC machine with improved kinematics, incorporating a workpiece support that can be moved along multiple axes, including a counterbalance system and a torque drive for high accelerations and speeds, and a method that substitutes x-direction movement with a combination of rotation and linear movement to manage direction changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high feed rates are used in the EHLA process, then productivity is improved, but vibrations increase during direction changes
Solution Approach 1:
The patent applies a counterbalance mechanism (Countergewicht) that moves in opposition to the workpiece support during direction changes. This counterbalance compensates for the inertial forces generated during acceleration and deceleration, thereby reducing vibrations in the CNC machine structure while enabling high feed rates to be maintained.
Solution Approach 2:
The patent implements dynamic control of the drive system by substituting pure linear movement with a combination of rotation and linear movement during direction changes. This dynamic approach allows the system to manage accelerations more effectively, reducing vibrations while maintaining high productivity.
2Productivity
If high accelerations are used during direction changes, then productivity is improved, but the mechanical stress on the CNC machine increases
Solution Approach 1:
The counterbalance mechanism reduces the mechanical stress on the CNC machine structure by compensating for the forces generated during high acceleration. The counterweight moves in opposition to the workpiece support, distributing the mechanical load and preventing excessive stress on the machine components.
Solution Approach 2:
The patent introduces rotational movement as an additional dimension to the traditional linear movement. By combining rotation about an a-axis with linear movement along the x-axis, the system can achieve direction changes with high acceleration while distributing mechanical stress across multiple degrees of freedom, reducing the stress on any single component.
3Adaptability or versatility
If complex shapes are manufactured, then adaptability is improved, but the number of direction changes increases causing more vibrations
Solution Approach 1:
The patent applies dynamic control strategies that substitute linear movement with a combination of rotation and linear movement during direction changes. This dynamic approach allows the CNC machine to process complex shapes with multiple direction changes while maintaining high feed rates and reducing vibrations through optimized acceleration profiles.
Solution Approach 2:
The counterbalance mechanism continuously compensates for inertial forces during the processing of complex shapes. As the workpiece support undergoes multiple direction changes to accommodate complex geometries, the counterweight moves in opposition to mitigate the vibrations generated by each acceleration and deceleration event.
Data Source
AI summary
The disclosure relates to a CNC machine, in particular a machine for additive manufacturing involving laser welding. The CNC machine comprises a workpiece support that can be moved in a plane along an x-axis and a y-axis. At least for movement along the x-axis, the CNC machine comprises two synchronously moving drives and a counterbalance which moves in the opposite direction.