Reference Temperature Timing for Machine Tool Thermal Compensation
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Solution Overview
Problem
Conventional methods for setting a reference temperature for thermal displacement compensation in machine tools are often unstable due to inappropriate timing and individual differences among temperature sensors, leading to inaccurate displacement estimation.
Innovation Solution
A device and method that acquires measured values from multiple temperature sensors to determine a suitable setting timing for the reference temperature, ensuring that the difference between sensor readings is within a threshold, thereby stabilizing the machine tool's state and setting an appropriate reference temperature for thermal displacement compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a reference temperature is set using conventional methods (power-on timing, fixture placement timing, or member temperature), then the setting process is simple, but the thermal displacement compensation accuracy becomes unstable due to inappropriate timing and individual sensor differences
Solution Approach 1:
The patent applies dynamics by making the reference temperature setting timing adaptive rather than fixed. The system dynamically determines the optimal setting timing based on real-time temperature stability detection, allowing the reference temperature to be set at the most appropriate moment regardless of when power is applied or fixtures are placed. This resolves the contradiction by enabling accurate compensation without requiring complex pre-programmed timing sequences.
Solution Approach 2:
The system applies self-service by automatically detecting temperature stability and determining reference temperature setting timing without requiring manual intervention or complex external control. The temperature detection unit and setting unit work autonomously to identify when temperature has stabilized and set the reference temperature accordingly, simplifying the overall process while maintaining high accuracy.
2Stability of the object's composition
If the reference temperature is set when the machine generates heat, then the temperature reading may be stable, but it becomes impossible to estimate the amount of thermal displacement correctly
Solution Approach 1:
The patent applies preliminary action by detecting temperature stability in advance and using this information to determine the optimal timing for setting the reference temperature. The system performs preliminary temperature monitoring to identify when the temperature has stabilized at an appropriate level, then sets the reference temperature at this predetermined optimal moment, ensuring both stability and accuracy in thermal displacement estimation.
3Stability of the object's composition
If a member having a large temperature time constant is used as a reference, then the reference temperature appears stable, but reference temperatures of all sensors become constant independently of locations, individual differences, and acquisition methods, causing differences from actual temperatures
Solution Approach 1:
The patent applies feedback by continuously monitoring temperature readings from multiple sensors and using this feedback to determine when reference temperature setting timing is appropriate. The system adjusts the reference temperature setting based on real-time temperature stability feedback, ensuring that the reference temperature accurately reflects actual sensor readings while maintaining stability. This resolves the contradiction by preventing the use of overly stable but inaccurate reference points.
Data Source
AI summary
To provide a reference temperature setting device, a reference temperature setting method, and a reference temperature setting program capable of setting an appropriate reference temperature for thermal displacement compensation. A reference temperature setting device comprises: an acquisition unit that acquires measured values from multiple temperature sensors installed on a machine; and a determination unit that determines setting timing for a reference temperature for thermal displacement compensation to coincide with a point in time when the measured values satisfy a predetermined condition.