Machine Tool Thermal Compensation Using Tool-Tip Displacement Data
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Solution Overview
Problem
Current machine tools face challenges in accurately compensating for thermal displacement errors, leading to decreased processing accuracy and reduced productivity due to the use of fixed thermal displacement compensation parameters that do not account for changing temperature conditions, requiring frequent recalibration and resulting in decreased production efficiency.
Innovation Solution
An apparatus and method that automatically convert thermal displacement compensation parameters in real-time using Z-directional or Y-directional displacement data from a tool measuring unit and temperature data from multiple temperature measuring units, calculating a thermal displacement compensation parameter based on an average value of temperature data matrices and displacement changes to optimize compensation for the current thermal state of the machine tool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If fixed thermal displacement compensation parameters are used, then the system structure is simple, but processing accuracy decreases due to inability to adapt to changing temperature conditions
Solution Approach 1:
The patent implements dynamic thermal displacement compensation by continuously measuring temperature at multiple points and calculating real-time compensation parameters. The system transitions from fixed static parameters to dynamic parameters that automatically adjust according to current thermal states, thereby improving processing accuracy while managing complexity through automated calculation algorithms.
Solution Approach 2:
The patent changes the compensation parameters from fixed values to variable values that depend on measured temperature conditions. By establishing a relationship between temperature measurements and compensation parameters, the system adapts parameters dynamically based on actual thermal states, resolving the contradiction between simplicity and accuracy.
2Manufacturing precision
If thermal displacement compensation parameters are recalibrated frequently, then processing accuracy is maintained, but productivity decreases due to machine tool stoppage
Solution Approach 1:
The patent enables continuous thermal displacement compensation by automatically measuring temperature and calculating compensation parameters during machine operation. This eliminates the need for periodic stoppage and manual recalibration, maintaining processing accuracy while ensuring continuous production and improving overall productivity.
Solution Approach 2:
The system performs self-calibration by automatically measuring its own thermal state through temperature sensors and computing appropriate compensation parameters without external intervention. This self-service capability maintains accuracy continuously without requiring operator involvement or production stoppage.
3Measurement precision
If multiple temperature measuring units are installed, then thermal displacement measurement accuracy improves, but device complexity increases
Solution Approach 1:
The patent divides the thermal measurement task into multiple segments by installing temperature measuring units at different critical locations of the machine tool. Each sensor measures local temperature, and the system integrates these segmented measurements to calculate overall thermal displacement, improving measurement accuracy while distributing the complexity across multiple simple sensing points.
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 enables precise compensation for thermal displacement errors, improving processing accuracy and productivity by allowing real-time adjustments to thermal displacement compensation parameters, reducing the time and cost associated with recalibration, and maximizing machine tool processing time.
Implementation Method 1
thermal deformation is generated by cutting heat generated by friction between the tool and the workpiece during the processing of the workpiece, main shaft frictional heat generated by a high-speed rotation of the main shaft
Implementation Method 2
An apparatus for compensating for a thermal deformation error of a machine tool... calculates a thermal displacement compensation amount by using a thermal displacement compensation amount calculation equation
Data Source
AI summary
The present invention relates to an apparatus and a method of automatically converting thermal displacement compensation parameters of a machine tool, which automatically convert a compensation parameter of a thermal displacement compensation equation of a machine tool so that the compensation parameter is optimized to a current thermal displacement state of the machine tool in real time based on Z-directional or Y-directional displacement data of a tool tip end of a reference tool measured by a tool measuring unit according to an operation state of the machine tool or various kinds of machine tools or thermal displacement data of the machine tool calculated by measuring a processed portion of a processed material, and temperature data measured by a temperature measuring unit, to minimize a processing error according to thermal displacement and improve processing accuracy of the machine tool.