Thermal Displacement Correction for Machine Tools
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Solution Overview
Problem
Conventional thermal displacement correction methods for machine tools often fail to accurately determine the necessity of actual measurements, leading to correction errors and inefficiencies due to predetermined measurement times and reliance on processing program information, which can vary with machine properties and environments.
Innovation Solution
A thermal displacement correction apparatus that predicts thermal displacement amounts and calculates correction values, including a determination unit to assess the need for actual measurements based on adjustment value changes, allowing for real-time adjustments and reduced measurement times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If actual measurement is performed at predetermined measurement times, then measurement data can be obtained for correction, but measurement time cannot be optimized and unnecessary measurements increase processing time
Solution Approach 1:
The patent implements dynamic measurement timing by using a determination unit that evaluates whether actual measurement is necessary based on thermal displacement correction amounts and processing conditions. Instead of fixed predetermined measurement times, the system adaptively decides measurement timing based on real-time thermal states and correction needs, optimizing the balance between measurement precision and time efficiency
Solution Approach 2:
The system changes the parameter of measurement timing from static (predetermined) to dynamic (determination-based). The determination unit monitors thermal displacement correction amounts and processing conditions, adjusting measurement timing parameters according to actual thermal states and correction requirements, thereby reducing unnecessary measurements while maintaining correction precision
2Measurement precision
If measurement time is changed for each processing program, then correction precision can be optimized for specific conditions, but system complexity and operation difficulty increase
Solution Approach 1:
The determination unit automatically determines whether actual measurement is necessary by evaluating thermal displacement correction amounts and processing conditions itself, without requiring external intervention or complex preset configurations for each program. The system serves itself by making intelligent decisions based on monitored parameters, reducing operational complexity while maintaining optimized measurement precision
Solution Approach 2:
The system uses feedback from thermal displacement correction amounts and processing conditions to automatically determine measurement necessity. The determination unit continuously monitors correction data and adjusts measurement timing based on this feedback, eliminating the need for manual configuration of measurement times for different programs while maintaining high correction precision
3Extent of automation
If conventional determination methods using processing program information are used, then some automation is achieved, but necessity of actual measurement cannot be properly determined for all machine properties and environments
Solution Approach 1:
The patent replaces conventional determination methods based on processing program information with a determination unit that directly monitors thermal displacement correction amounts and processing conditions. This substitution of the determination mechanism enables more reliable and accurate assessment of actual measurement necessity across diverse machine properties and environments, while maintaining high automation levels
Solution Approach 2:
The determination unit is designed with universal applicability to handle various machine properties and processing environments. By monitoring fundamental parameters (thermal displacement correction amounts and processing conditions) rather than program-specific information, the system achieves reliable measurement necessity determination across different machines and conditions, enhancing both automation and reliability
Data Source
AI summary
There is provided a thermal displacement correction apparatus for a machine tool which automatically determines necessity/unnecessity of actual measurement of the machine tool, the apparatus including: a thermal displacement correction unit that predicts a thermal displacement amount from an operation of a machine or a temperature of each portion of the machine and calculates a thermal displacement correction amount for correcting thermal displacement by adding, to a position command value of a feed axis, the thermal displacement correction amount for cancelling the thermal displacement amount thus predicted; and a thermal displacement correction amount adjustment unit that calculates an adjustment value for adjusting the thermal displacement correction amount on the basis of the thermal displacement correction amount, wherein a change amount ΔE from the start of processing is obtained, ΔE is compared with designated Em, and when ΔE≥Em, actual measurement is performed with measurement means.