Mineral-Cast Machine Tool Structure With Embedded Load Sensing
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Solution Overview
Problem
Machine tools face challenges in accurately detecting and compensating for mechanical loads in real-time due to thermal inertia, leading to precision issues in workpiece machining.
Innovation Solution
Integration of a sensor module within a mineral casting structural component that encloses sensors to detect mechanical loads directly, allowing for real-time monitoring and compensation without relying on thermal measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If thermal detection methods are used to monitor machine bed changes, then temperature changes can be detected, but detection is delayed due to thermal inertia and short-term changes cannot be detected
Solution Approach 1:
The patent replaces thermal detection methods with mechanical sensing. Strain sensors (force sensors) are integrated directly into the mineral casting to detect mechanical loads and forces acting on the machine bed structure. This substitution of detection principle eliminates thermal inertia delays, enabling real-time monitoring of structural changes and mechanical loads without the time lag inherent in thermal measurement methods.
Solution Approach 2:
The patent introduces strain sensors as intermediary elements embedded within the mineral casting structure. These sensors act as mediators that directly sense mechanical loads and forces transmitted through the machine bed, providing immediate feedback on structural changes. The sensors are positioned at critical locations to detect loads from workpieces, tools, and machining operations in real-time.
2Strength
If the machine bed is dimensioned to be sufficiently large and rigid to absorb mechanical loads, then mechanical load absorption is improved, but thermal compensation becomes difficult and expensive
Solution Approach 1:
The patent implements a feedback-based approach where strain sensors continuously monitor mechanical loads on the machine bed, and this information is fed to a control unit. The control unit processes the sensor signals and generates compensation values that are applied to adjust the tool center point position in real-time. This closed-loop feedback system enables dynamic thermal and mechanical compensation without requiring oversizing of the machine bed or complex passive thermal management systems.
Solution Approach 2:
The patent replaces complex thermal compensation systems with a mechanically-based sensing and compensation approach. Instead of using elaborate thermal management hardware (cooling channels, heating elements, thermal barriers), the system uses strain sensors to directly measure mechanical loads and a control unit to computationally compensate for their effects. This substitution simplifies the physical structure while maintaining or improving compensation effectiveness.
3Loss of time
If sensors are integrated into the mineral casting, then real-time mechanical load detection is enabled, but the sensor module must be completely enclosed by the casting
Solution Approach 1:
The patent applies preliminary action by integrating the strain sensor module into the mineral casting during the casting process itself, before the final product is completed. The sensor module is positioned and secured within the mold cavity, and the mineral casting is then formed around it. This preliminary integration ensures the sensors are embedded in their final positions with optimal mechanical coupling to the structure, enabling immediate real-time detection capability upon completion of the casting.
Solution Approach 2:
The patent employs nesting by placing the sensor module inside the mineral casting structure. The sensor module is completely enclosed by the casting material, with the mineral casting surrounding and contacting the sensor module in all three spatial directions. This nested arrangement protects the sensors while ensuring direct mechanical coupling to detect loads, and the sensors can be positioned at critical locations within the structure for optimal detection.
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
Enables precise and immediate detection of mechanical changes, improving machining precision by creating an accurate structural model and allowing for timely load compensation, reducing the need for thermal property knowledge and minimizing time delays.
Implementation Method 1
The sensor module is completely enclosed by the mineral casting and contains at least one sensor for detecting a mechanical load
Data Source
AI summary
A structural component for a machine tool is formed from a mineral casting and at least one sensor module is integrated into the structural component, wherein the sensor module is completely enclosed by the mineral casting and contains at least one sensor for detecting a mechanical load of the structural component during operation of the machine tool.