Adaptive Clamping Force Control to Prevent Machining Resonance
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Solution Overview
Problem
The constant clamping force in existing clamping devices leads to resonance phenomena during machining, deteriorating the surface quality of workpieces due to changes in the workpiece's geometric pattern and natural frequency of the machine tool system.
Innovation Solution
A clamping device with first and second holders, each equipped with abutting and driving members, coupled with a sensor and processor to dynamically adjust the stiffness coefficients of the abutting members to match the optimum system's natural frequency, preventing resonance by actively controlling the clamping force and stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If constant clamping force is applied, then the workpiece is securely held, but resonance occurs due to changes in natural frequency during machining
Solution Approach 1:
The patent applies dynamics by making the clamping force variable rather than constant. The control unit dynamically adjusts the clamping force based on real-time feedback from sensors that detect vibration and position, allowing the system to adapt to changing natural frequencies during machining and avoid resonance while maintaining stability
Solution Approach 2:
The patent implements feedback control by using sensors to detect vibration and position of the workpiece, transmitting this information to a control unit that calculates optimal clamping force values and adjusts the actuators accordingly. This closed-loop feedback system enables the clamping force to respond to changes in the workpiece's natural frequency and prevent resonance
2Stability of the object's composition
If high clamping force is used to prevent vibration, then machining stability improves, but surface quality deteriorates due to resonance
Solution Approach 1:
The system dynamically adjusts clamping force in real-time during machining operations, increasing force when vibration is detected and reducing it when the workpiece is stable, thereby maintaining machining stability while preventing the excessive force-induced resonance that degrades surface quality
Solution Approach 2:
Through continuous sensor monitoring of vibration and position, the feedback control system detects early signs of resonance and adjusts clamping force accordingly, preventing the development of harmful vibrations that would compromise surface quality while maintaining adequate machining stability
3Ease of manufacture
If the clamping device structure is simplified, then ease of manufacture increases, but the ability to dynamically adjust stiffness decreases
Solution Approach 1:
The patent achieves multi-functionality by integrating sensing, control, and actuation capabilities into a unified clamping device architecture. The same structural components serve both mechanical clamping functions and dynamic stiffness adjustment functions through coordinated control of multiple actuators, eliminating the need for separate complex adjustment mechanisms
Solution Approach 2:
The control unit automatically calculates optimal clamping forces and actuator commands based on sensor feedback without requiring manual intervention or complex external control systems. The device self-regulates its stiffness characteristics through integrated control algorithms that process sensor data and adjust actuators in real-time, simplifying the overall system architecture
Data Source
AI summary
A clamping device includes a first holder and a second holder. The first holder includes a first abutting member and a driving member. The driving member is coupled to the first abutting member. The second holder includes a second abutting member. The first abutting member and the second abutting member are oppositely disposed and spaced apart from each other to receive a workpiece. The driving member is coupled to the first abutting member to drive the first abutting member to move in a direction toward the second abutting member to clamp the workpiece between the first abutting member and the second abutting member.