Thermal Displacement Correction Device Using Error Coefficients
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Solution Overview
Problem
Existing thermal displacement correction devices in working machines face challenges in maintaining precision due to complex temperature distributions and the inability to accurately estimate thermal displacement, leading to degraded correction precision and increased operational costs from sensor usage.
Innovation Solution
A thermal displacement correction device that calculates correction precision using a correction error coefficient and notifies degradation, optionally stopping the processing operation or adjusting offset values using a touch probe or position sensor when precision is not met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If thermal displacement correction is performed using calculated correction amounts, then processing precision is improved, but correction precision degrades when temperature distribution becomes complex
Solution Approach 1:
The system calculates correction precision by multiplying the thermal displacement correction amount by a correction error coefficient, providing feedback on the reliability of the correction. When correction precision falls below a threshold, the system notifies the operator and can stop processing, preventing degradation of manufacturing precision.
Solution Approach 2:
The system performs preliminary calculation of correction precision before actual processing using pre-stored correction error coefficients that represent the relationship between thermal displacement amounts and actual displacement errors. This allows the system to predict and prevent precision degradation before it occurs.
2Measurement precision
If temperature sensors or displacement sensors are used to improve correction precision, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The system replaces expensive and fragile sensors with a computational approach using pre-stored correction error coefficients. This software-based solution achieves similar precision improvement without the cost, complexity, and protection requirements of physical sensors.
Solution Approach 2:
The system replaces the mechanical sensor-based measurement approach with a computational method that uses correction error coefficients to estimate actual thermal displacement amounts, thereby eliminating the need for physical sensors and their associated protection mechanisms.
3Measurement precision
If operator examination of correction precision is performed by stopping processing operations, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The system replaces manual operator examination with automated calculation of correction precision using correction error coefficients. This allows continuous monitoring of correction quality without stopping processing operations, maintaining both measurement precision and productivity.
Solution Approach 2:
The system enables continuous processing operations by automatically calculating and monitoring correction precision in real-time. The useful action of precision examination continues without interruption, eliminating the need to stop processing for manual checks.
4Device complexity
If thermal displacement correction is performed without sensors, then device complexity is reduced, but correction precision degrades due to inability to completely estimate displacement amount
Solution Approach 1:
The system performs preliminary calculations of thermal displacement correction amounts and stores correction error coefficients that represent the relationship between calculated and actual displacement. This preliminary preparation enables accurate correction without sensors during actual processing.
Solution Approach 2:
The system provides feedback on correction precision by multiplying the thermal displacement correction amount by the correction error coefficient, allowing the sensorless system to monitor and maintain acceptable correction quality without physical sensors.
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 reliability of thermal displacement correction by estimating precision and automatically stopping or adjusting measurements to maintain predetermined precision, reducing unnecessary position measurements and operational inefficiencies.
Implementation Method 1
a structure provided therein is expanded or contracted during a processing operation of the working machine due to various factors such as heat of a motor, friction heat of a feeding shaft, cutting heat of a cutting operation, and heat transferred by a temperature of a cutting fluid or various ambient temperatures
Data Source
AI summary
Provided is a thermal displacement correction device for a working machine that includes a thermal displacement correction amount calculation unit for calculating a thermal displacement correction amount and configured to correct a thermal displacement amount caused by heat generated and radiated from the working machine and changing with time by the thermal displacement correction amount, the thermal displacement correction device for the working machine including: a correction error coefficient storage memory; a correction precision calculation unit configured to calculate the correction precision of the thermal displacement correction amount based on the thermal displacement correction amount and the correction error coefficient; and a correction precision degradation notification unit.