Processing Machine Tool Position Correction for Temperature Drift
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Solution Overview
Problem
Processing machines face precision issues due to deviations in the correspondence between the tool position and the detection value of the position sensor, caused by temperature changes and other factors.
Innovation Solution
A processing machine configuration that includes a workpiece holding part, a tool holding part, a drive source for relative movement, a sensor for detecting relative positions, a touch sensor for measuring tool deviation, and a control device with a correction part to adjust processing control based on measured deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a position sensor is used to detect relative positions of tool and workpiece, then positioning can be performed, but temperature changes cause deviation between detected position and actual tool position, reducing processing precision
Solution Approach 1:
The patent implements feedback by using a touch sensor to detect the actual position of the tool through contact measurement, then feeding this information back to calculate position deviation. The control device uses this feedback to correct the correspondence between position sensor detection values and actual tool positions, thereby maintaining processing precision despite temperature changes.
Solution Approach 2:
The patent replaces direct mechanical position measurement with a touch sensor-based contact measurement system. Instead of relying solely on the position sensor's electrical signals which drift with temperature, the system uses physical contact measurement to detect actual tool position, substituting the unreliable electrical measurement with a more stable mechanical contact method.
2Manufacturing precision
If the correspondence between tool position and position sensor detection value deviates due to temperature changes, then processing precision deteriorates, but adding correction mechanisms increases device complexity
Solution Approach 1:
The touch sensor serves multiple functions: it acts as a measurement tool for workpiece position detection and simultaneously as a calibration tool for correcting tool position deviations. This multi-functionality allows the system to maintain processing precision without adding separate correction mechanisms, thereby limiting the increase in device complexity.
Solution Approach 2:
The system performs self-calibration by using the touch sensor to automatically detect tool position deviations and generate correction values. The control device automatically updates the correspondence between position sensor values and actual positions without requiring external intervention or complex manual calibration procedures, allowing the system to self-correct for temperature drift.
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
Enables accurate measurement and correction of tool position deviations, thereby improving processing precision and maintaining consistent performance despite environmental changes.
Implementation Method 1
a position sensor which detects relative positions in a three-dimensional coordinate system of a tool holding part (for example a spindle) which holds the tool and a workpiece holding part (for example a table) which holds a workpiece
Data Source
AI summary
A control device of a processing machine controls a first drive source based on detection values from a first sensor so that a reference workpiece other than a workpiece is processed from a first direction by a tool into a prescribed target shape. The control device measures a shape of the reference workpiece based on a detection value from the first sensor at the time when contact in the first direction of a touch sensor with the processed reference workpiece by the touch sensor. The control device specifies a first deviation amount of a position of the tool in the X-direction based on a deviation amount in the first direction between the target shape and the measured shape, and corrects control for processing the workpiece based on the specified first deviation amount.