Axis Guide Mounting Surface Correction for Motion Accuracy
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Solution Overview
Problem
Current methods for mechanical correction of geometric motion errors and deformation of structural loops in high precision positioning machines are limited by manufacturing difficulties, high costs, and inefficiencies, lacking a viable solution for systematic deviations.
Innovation Solution
A method involving the measurement of geometrical deviations on mounting surfaces, calculation of deformations due to gravity, and derivation of a mounting surface correction profile to guide laser machining for precise material removal, thereby correcting axis geometry and improving motion accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If automated mechanical correction systems are used to modify guideway geometry, then manufacturing precision is improved, but device complexity and manufacturing difficulty increase due to the inability to create defined corrugated geometry with available methods
Solution Approach 1:
The patent replaces traditional mechanical scraping and grinding processes with a laser-based correction system. The laser beam precisely removes material from the guideway surface to create the required corrugated geometry, eliminating the need for complex mechanical correction equipment and manual scraping operations while achieving superior geometric accuracy
Solution Approach 2:
The patent changes the physical state and properties of the correction process by using laser energy instead of mechanical force. The laser parameters (power, pulse duration, scanning speed) are precisely controlled to achieve the desired material removal pattern, transforming the correction approach from mechanical to optical/thermal domain
2Manufacturing precision
If manual scraping is applied to correct geometric deviations, then manufacturing precision is improved, but productivity decreases due to long process duration and high staff cost
Solution Approach 1:
The patent substitutes manual mechanical scraping with an automated laser correction system. The laser beam, guided by a programmable system, automatically removes material according to pre-calculated correction profiles, eliminating manual labor while dramatically increasing correction speed and consistency
Solution Approach 2:
The patent performs preliminary measurement and calculation of geometric deviations before the correction process. The correction profile is pre-determined based on measured errors, allowing the laser system to execute the correction efficiently without real-time manual intervention or iterative scraping operations
3Ease of manufacture
If software compensation is used to correct geometric errors, then ease of manufacture is improved, but measurement precision requirements increase due to uncertainty and repeatability limitations
Solution Approach 1:
The patent performs comprehensive measurement and calculation of geometric deviations in advance, creating a detailed correction profile before any physical correction is applied. This preliminary action allows for precise identification of all errors that will be corrected, enabling the system to achieve high accuracy without requiring extremely precise real-time measurement during operation
Solution Approach 2:
The patent transitions from purely software-based compensation to a physical correction approach using laser material removal. This creates a hybrid solution where the physical modification of the guideway geometry permanently eliminates systematic errors, reducing the burden on software compensation and measurement systems
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 enables quick, precise, and efficient mechanical correction of axis motion errors, enhancing the geometric accuracy of positioning machines by selectively removing material based on calculated deviations, thus improving the overall performance and reliability of high precision mechanisms.
Implementation Method 1
A laser beam is used to impart the mounting surface correction profile to a mounting surface of one of the axis guide components
Implementation Method 2
Due to the finite stiffness of the machine components, their location and dimension changes due to internal and external forces. In some cases, the weight and position of for instance the work piece or moving carriages of the machine have a significant influence on the machine's accuracy
Data Source
Figure 1
Figure 2a~2d
Figure 3a~4
AI summary
The present invention is related to a method for the mechanical correction of geometric motion errors of a positioning machine having at least two machine frame components and at least one axis movement assembly for the relative movement of the machine frame components, the at least one axis movement assembly comprising a plurality of axis guide components, each axis guide component and each machine frame component having a mounting surface. A mounting surface correction profile is determined for the considered axis, whereas the mounting surface correction profile describes the correction amounts in function of the position for the mechanical correction of the considered axis. The determined mounting surface correction profile is imparted to the mounting surface of the axis guide component or to the mounting surface of the machine frame component of the considered axis by machining.