Machine Tool Thermal Deformation Compensation
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Solution Overview
Problem
High-precision mechanical machining operations in uncontrolled temperature and humidity environments, such as cold or humid regions, lead to thermal deformations in machine tools, affecting the accuracy of machining due to deformations in the measuring means like optical lines or linear encoders.
Innovation Solution
A machine tool with a system that includes temperature sensors along the optical line to detect temperature changes and generate correction signals for the translation control, using a management system connected to the control means of the translation of the upright base, accounting for the linear heat expansion coefficient of the optical line, and a thermally separated feeler to determine movement corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If machining operations are performed in uncontrolled temperature environments, then the machine tool can operate in cold or humid regions, but thermal deformations occur in the measuring means causing loss of precision
Solution Approach 1:
Temperature sensors are installed along the optical line to continuously monitor temperature variations. The control system receives temperature data and automatically calculates compensation values based on the thermal expansion coefficient, applying corrections to the measured positions to maintain precision despite temperature changes
Solution Approach 2:
The system changes the measurement parameters by introducing temperature-dependent correction factors. The control system adjusts the measured position values based on detected temperature variations and the known thermal expansion coefficient of the optical line, effectively compensating for thermal deformations
2Measurement precision
If temperature sensors and correction systems are added to compensate for thermal deformations, then measurement precision is maintained, but device complexity increases
Solution Approach 1:
The system replaces complex mechanical thermal compensation mechanisms with an electronic/software-based solution. Temperature sensors provide data to a control system that calculates and applies corrections algorithmically, avoiding the need for complex mechanical adjustment devices while maintaining measurement 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
This solution increases the precision of machining operations by effectively compensating for heat deformations, reducing imprecision caused by temperature fluctuations and maintaining high accuracy in uncontrolled environments.
Implementation Method 1
a system (30) suitable for detecting the temperature of the optical line (20) and generating correction signals (23) for the control means (18) of the translation of the upright base (4), according to at least one temperature read along said optical line (20) and according to the linear heat expansion coefficient of the optical line (20)
Data Source
Figure 1~3
Figure 4~5
Figure 6~9
AI summary
A machine tool, e.g., of large dimensions, comprises a j bench (2), an upright base (4), control means of the translation of the upright base, an upright base position sensor comprising an optical line or linear encoder (20) fixed to the bench (2), means for detecting the temperature (T1,...,Tn) of the optical line and management means (30) for processing the temperature signals coming from the optical line temperature detection means and the signals of the upright base translation control means to determine a correction signal for the upright base translation control means according to at least one temperature detected along the optical line.