Form Measuring Machine Magnetic Torque Stabilization
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Solution Overview
Problem
Form measuring machines with lever-type detectors face issues with measuring force stabilization, leading to thermal deformation, electrical noise, and increased costs due to the need for controllers, and existing stabilization techniques do not effectively manage measuring force fluctuations.
Innovation Solution
A form measuring machine design that incorporates a magnetic force adjuster to counteract the torque generated by an elastic member, using a combination of magnetic forces to stabilize the measuring force, allowing for a compact configuration and adjustable measurement responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a crossed spring is incorporated into the rotation axis to reduce hysteresis, then measurement reproducibility is improved, but measuring force fluctuates according to measurement position causing deviation
Solution Approach 1:
The patent introduces a counter-spring arranged in opposition to the crossed spring, where the counter-spring generates a torque that counterbalances the torque from the crossed spring. This counterweight approach compensates for the measuring force fluctuations caused by the crossed spring, stabilizing the total measuring force while preserving the low-hysteresis benefits of the crossed spring mechanism.
Solution Approach 2:
The patent combines two different spring mechanisms (crossed spring and counter-spring) into a composite elastic member system. By integrating these two springs with different characteristics, the system achieves both low hysteresis (from the crossed spring) and stable measuring force (from the combination of both springs), resolving the contradiction between measurement reproducibility and force stability.
2Object-affected harmful factors
If low measuring force is used to inhibit deformation or damages to the workpiece, then workpiece protection is improved, but responsiveness of the probe follows the workpiece shape deteriorates
Solution Approach 1:
The counter-spring mechanism allows for precise control and optimization of the measuring force magnitude. By adjusting the counter-spring's elastic coefficient, the system can maintain a low measuring force to protect the workpiece from deformation while still achieving adequate responsiveness through optimized mechanical leverage and detector sensitivity.
Solution Approach 2:
The patent enables adjustment of the measuring force parameter by changing the elastic coefficients of the crossed spring and counter-spring. This allows optimization of the measuring force to an appropriate level that balances workpiece protection with measurement responsiveness, rather than being fixed at either extreme.
3Force
If controlling measuring force is implemented to stabilize it, then measuring force stability is improved, but thermal deformation and electrical noise increase leading to decreased measurement precision
Solution Approach 1:
The patent replaces the active electronic control system with a passive mechanical compensation system using a counter-spring. This mechanical substitution eliminates the need for sensors, controllers, and power supply that generate heat and electrical noise, while still achieving measuring force stabilization through the mechanical counterbalancing of torques from the two springs.
Solution Approach 2:
The counter-spring mechanism automatically compensates for measuring force fluctuations through its elastic deformation characteristics, without requiring external control systems. The system self-regulates the measuring force based on the displacement of the probe, eliminating the need for active control that would introduce thermal and electrical interference.
4Force
If a controller is mounted to control measuring force, then measuring force stability is improved, but device complexity and costs increase
Solution Approach 1:
The patent replaces the complex electronic control system (sensors, controllers, power supply, feedback circuits) with a simple mechanical counter-spring mechanism. This mechanical substitution dramatically reduces device complexity and costs while achieving the same functional goal of measuring force stabilization through passive mechanical means.
Solution Approach 2:
The counter-spring mechanism provides automatic, self-regulating measuring force stabilization without requiring any external control systems or power supply. The mechanical system serves itself by using the elastic deformation of the counter-spring to automatically compensate for force fluctuations, eliminating the need for complex control infrastructure.
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 solution effectively stabilizes the measuring force regardless of displacement, reducing thermal effects and electrical noise, and eliminates the need for controllers, thereby improving measurement precision and reducing costs.
Implementation Method 1
a measuring force adjuster which imparts on the first member and the second member a torque, in a reverse direction of the torque generated by the elastic member, by an attraction force generated by a magnetic force between at least two magnetic members mutually arranged at opposite ends
Data Source
AI summary
A measuring force includes a stem, an arm, a detector, a rotation fulcrum, and a measuring force adjuster. A probe which makes contact with a workpiece is provided on the stem. An end portion of the arm is joined to the stem. The rotation fulcrum acts as a fulcrum for a rotating motion of the stem and the arm. The detector detects a displacement amount of the rotating motion of the arm. A crossed spring of the rotation fulcrum imparts on the stem and the arm a torque around an axis of the rotating motion in accordance with the displacement amount of the rotating motion. The measuring force adjuster imparts on the arm and the stem a torque, in a reverse direction of the torque generated by the crossed spring, by an attraction force generated by a magnetic force between at least two magnetic members mutually arranged at opposite ends.