Machine Tool Thermal Displacement Correction Across Variable Environments
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Solution Overview
Problem
Existing thermal displacement correction devices for machine tools are not accurate enough to account for varying installation environments, leading to reduced dimensional accuracy of manufactured products.
Innovation Solution
A thermal displacement correction device that includes temperature sensors, a memory to store multiple correspondence relationships for different environmental conditions, a comparison selection portion to match detected temperature distributions with stored data, and a correction command portion to adjust tool positions based on estimated thermal displacement amounts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If thermal displacement correction is performed using a single reference environment, then the device complexity is reduced, but the manufacturing precision deteriorates due to environmental variations
Solution Approach 1:
The patent applies parameter changes by storing multiple correspondence relationships between temperature distributions and thermal displacement amounts, each corresponding to different environmental conditions (e.g., different ambient temperatures, humidity levels). The system selects the appropriate correspondence relationship based on the current environment, thereby adapting the correction parameters to match actual operating conditions and improving dimensional accuracy without requiring a completely new correction device.
Solution Approach 2:
The patent implements dynamics by making the correction device adaptive to changing environmental conditions. The control portion dynamically selects the most appropriate correspondence relationship from stored data based on detected environmental parameters, allowing the thermal displacement correction to adjust in real-time to environmental variations rather than relying on a fixed reference environment.
2Manufacturing precision
If multiple correspondence relationships for different environmental conditions are stored, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-storing multiple correspondence relationships between temperature distributions and thermal displacement amounts for various environmental conditions in the memory. This preparation is done in advance before actual machining operations, so that when environmental variations occur, the system can immediately retrieve and apply the appropriate correction data without complex real-time calculations, thereby improving correction accuracy while keeping the control system relatively simple.
3Ease of manufacture
If the thermal displacement coefficient is set for a reference environment, then the ease of manufacture is improved, but the reliability deteriorates under varying environmental conditions
Solution Approach 1:
The patent applies parameter changes by storing multiple sets of thermal displacement coefficients corresponding to different environmental conditions rather than using a single reference environment coefficient. The system selects the appropriate coefficient set based on detected environmental parameters, maintaining ease of manufacture through pre-calculated coefficients while significantly improving correction reliability under varying environmental 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
Improves the accuracy of thermal displacement corrections to match the specific installation environment, enhancing the dimensional accuracy of machine tool products.
Implementation Method 1
the machine tool also generates heat at the contact point between the workpiece and the tool. This heat displaces various portions of the machine tool due to thermal expansion, etc., which changes the position of the tool relative to the workpiece
Data Source
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AI summary
To improve the correction accuracy relative to thermal displacement in a thermal displacement correction device for a machine tool, the thermal displacement correction device (100) includes a temperature sensor (Si) provided in a plurality of portions of an automatic lathe (200), a memory (30) that stores a plurality of data tables (31) set for each of a plurality of environmental conditions, which are different from each other, as a correspondence relationship between a temperature distribution of the automatic lathe (200) detected by the temperature sensor (Si) corresponding to machining under a machining condition and a thermal displacement amount of a position of the tool of the automatic lathe, a comparison selection portion (20) selects the data table (31) having a temperature distribution closest to the temperature distribution detected when the automatic lathe (200) machines at a site, a thermal displacement estimation portion (40) that estimates the thermal displacement amount based on the selected data table (31) and the detected temperature distribution, and a correction command portion (50) that outputs a thermal displacement correction amount to correct the position of the tool to cancel the estimated thermal displacement amount.