Measuring Machine Bed Deformation Compensation
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Solution Overview
Problem
Current compensation techniques for measuring machines do not account for measurement errors caused by elastic deformations of the machine bed under the weight of the workpiece, leading to inaccuracies, especially with heavy workpieces like dies and large engine parts.
Innovation Solution
A method that calculates correction values by considering the weight and position of the workpiece on the machine bed, using a finite-element model and deformation maps to account for rotations and roll variations, integrating these into the existing geometrical compensation system to correct for machine bed deformations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current geometrical compensation techniques are used, then constructional defects are corrected, but measurement errors from elastic deformations under workpiece weight are not accounted for
Solution Approach 1:
The patent pre-calculates deformation maps for various workpiece weights and positions using finite element analysis before actual measurement. This preliminary computation stores deformation characteristics in advance, allowing the system to quickly retrieve and apply appropriate correction values during measurement without performing real-time complex calculations.
Solution Approach 2:
The patent introduces deformation maps as an intermediary data structure that bridges the gap between workpiece parameters (weight, position) and measurement corrections. These maps serve as a lookup table containing pre-computed deformation characteristics, enabling the system to translate physical deformation into correctable error values without direct physical sensing of the deformed state.
2Measurement precision
If heavy workpieces are measured on the machine bed, then production capability is maintained, but elastic deformations cause non-negligible measurement errors
Solution Approach 1:
The patent converts the harmful effect of elastic deformation into a beneficial correction mechanism. By pre-calculating deformation maps that characterize the deformation behavior under various loads, the system transforms the unavoidable physical deformation into predictable error patterns that can be systematically compensated through software correction, turning a physical limitation into a solvable computational problem.
Solution Approach 2:
The patent changes the approach from attempting to physically prevent deformation to computationally compensating for it by varying the correction parameters based on workpiece weight and position. The system adjusts measurement values dynamically based on the selected workpiece parameters, applying different correction values from the deformation maps according to the actual loading conditions.
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
This method enhances measurement accuracy by compensating for both geometrical and deformation-induced errors, ensuring precise measurements by accounting for the workpiece's weight and constraint conditions, applicable to various machine architectures.
Implementation Method 1
measurement errors deriving from the elastic deformations of the machine bed under the weight of the workpiece
Implementation Method 2
under the weight of the workpiece to be measured on the machine bed
Data Source
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AI summary
A method of compensating the measurement errors of a measuring machine (1) that derive from the deformations of the machine bed (2) caused by the load exerted by the workpiece to be measured on the machine bed, comprising a first acquisition step in which data regarding the weight of the workpiece and the modes of resting of the workpiece on the machine bed (2) are acquired, and a second calculation step in which correction values depending upon said data are calculated.