Flexible-Hinge Fast Tool Servo for Large Stroke Precision
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Solution Overview
Problem
Existing fast tool servo systems, such as piezoelectric ceramic and magnetostrictive systems, face challenges in achieving ultra-high machining precision and large stroke due to nonlinearity and magnetic effects, while electromagnetically driven systems are limited by conduction mechanisms that fail to ensure axial and lateral precision.
Innovation Solution
An electromagnetically driven fast tool servo system utilizing a flexible hinge combination mechanism with three different flexible hinges, where the first and second hinges have sheet-like cross structures with wide cross arms and an arc-shaped connecting portion, and the third hinge has a sheet-like cross structure with a narrower cross arm, connected through various screws and a guide shaft, to enhance stiffness and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a flexible hinge with a large stroke is used in the conduction mechanism, then the stroke of the system is improved, but the axial and lateral stiffness deteriorates
Solution Approach 1:
The conduction mechanism is divided into multiple flexible hinges (first, second, and third flexible hinges) with different structural characteristics. Each hinge segment contributes differently to the overall stroke and stiffness, allowing the system to achieve large stroke while maintaining adequate stiffness through the combined action of segmented components.
Solution Approach 2:
Different flexible hinges are designed with different local structural qualities - the first and second flexible hinges have wide cross arms for higher stiffness, while the third flexible hinge has a narrower cross arm for greater flexibility. This local differentiation allows each component to optimize its contribution to stroke and stiffness based on its position and function in the conduction mechanism.
2Device complexity
If a conventional conduction mechanism is used, then the structure is simple, but the axial and lateral precision deteriorates
Solution Approach 1:
The conduction mechanism employs flexible hinges with different local structural characteristics optimized for specific functions. The first and second flexible hinges with wide cross arms provide stability and precision, while the third flexible hinge with narrower cross arm provides necessary flexibility. This localized optimization of structural qualities enables high precision without excessive overall complexity.
Solution Approach 2:
The conduction mechanism uses a composite structure combining multiple flexible hinge designs with different geometric properties. This composite approach integrates components with varying stiffness characteristics to achieve both precision and adaptability, resolving the contradiction between structural simplicity and manufacturing precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves a large stroke with improved axial and lateral precision, reducing deformation and stroke loss, and ensures consistent axial displacement and reduced lateral deviation, thereby enhancing machining precision and stability.
Implementation Method 1
an electromagnetically driven fast tool servo system... a voice coil motor arranged in the base
Implementation Method 2
a flexible hinge combination mechanism... axial and lateral stiffness of the mechanism is improved, a deformation and a stroke loss caused by stretching of the mechanism are weakened
Data Source
AI summary
The present invention provides an electromagnetically driven fast tool servo system based on a flexible hinge combination mechanism, including a base, a voice coil motor arranged in the base, a tool mounting base connected to a coil of the voice coil motor by a first connecting portion, and a grating measurement device connected to the first connecting portion by a guide shaft arranged at a center of the voice coil motor, where the first connecting portion includes a first flexible hinge, a second flexible hinge, a first connecting member located between the first flexible hinge and the second flexible hinge, and a second connecting member located between the second flexible hinge and the coil of the voice coil motor; the tool mounting base, the first flexible hinge, the first connecting member, the second flexible hinge, the second connecting member, and an end of the guide shaft are coaxially connected in series by a first horizontal screw; the first flexible hinge and the second flexible hinge have sheet-like cross structures with the same shape, with end portions of cross arms fixedly connected to the base. In the present invention, axial and lateral precision of the system in a machining process is improved.