Numerical Control Tool Edge Detection Signal Validation
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Solution Overview
Problem
In numerical control apparatuses, intermittent reactions of touch sensors due to vibrations or incorrect tool contacts lead to erroneous detection signals, resulting in imprecise tool compensation values, which can cause interference and deteriorate machining precision.
Innovation Solution
A detection signal determining mechanism that identifies and enables only the first detection signal from a touch sensor, disabling subsequent signals based on elapsed time or distance criteria, ensuring accurate tool compensation by eliminating erroneous detections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch sensor is used to detect the tool cutting edge position, then the tool compensation value can be obtained, but intermittent reactions due to vibrations or incorrect contacts produce erroneous detection signals that deteriorate measurement precision
Solution Approach 1:
The system performs preliminary validation of detection signals by checking temporal intervals and positional consistency before accepting a measurement. The control unit examines whether the time interval between consecutive detection signals exceeds a predetermined threshold and whether the tool position has moved accordingly, rejecting erroneous signals in advance before they can corrupt the tool compensation value.
Solution Approach 2:
The system implements feedback mechanisms where the control unit continuously monitors detection signals and compares them against expected physical constraints (time intervals, position changes). When erroneous signals are detected, the system provides feedback by rejecting those signals and requesting re-detection, thereby improving the reliability of the final measurement through iterative validation.
2Quantity of substance
If multiple detection signals are continuously inputted from the touch sensor, then comprehensive data can be collected, but erroneous signals from vibrations or incorrect contacts are included, worsening manufacturing precision
Solution Approach 1:
The system applies different quality criteria to different detection signals based on their temporal and spatial characteristics. Each detection signal is individually evaluated against validity criteria (time interval thresholds, position change consistency), allowing the system to accept high-quality signals while rejecting erroneous ones, thereby maintaining manufacturing precision despite receiving multiple signals.
Solution Approach 2:
The system changes the evaluation parameters for detection signals by introducing temporal validation (time interval checks) and spatial validation (position change consistency checks). These parameter-based filtering criteria enable the system to distinguish between valid detection signals and erroneous ones caused by vibrations or incorrect contacts, improving tool compensation accuracy.
3Measurement precision
If the tool is brought into contact with the touch sensor to detect cutting edge position, then tool compensation can be performed, but the impact causes the touch sensor to react multiple times intermittently, producing erroneous detection signals
Solution Approach 1:
The system prepares for potential erroneous signals by establishing validation criteria before processing detection results. The control unit is pre-configured with time interval thresholds and position change requirements that act as a cushion against erroneous signals, automatically filtering out impact-induced multiple reactions before they can affect the measurement outcome.
Solution Approach 2:
The system converts the harmful effect of multiple intermittent reactions into a beneficial filtering opportunity. By requiring that valid detection signals meet specific temporal and spatial criteria, the system transforms the presence of multiple signals (including erroneous ones) into an opportunity to validate and select only the correct measurement, thereby improving reliability.
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 approach ensures precise detection by eliminating erroneous signals from touch sensor reactions and incorrect contacts, thereby improving machining precision by providing accurate tool compensation values.
Implementation Method 1
a tool cutting edge detector (2) for detecting a cutting edge position of a tool (16) mounted on a tool rest (16a)
Data Source
AI summary
A numerical control apparatus having tool cutting edge detecting unit for detecting a cutting edge position of a tool mounted on a tool rest, comprises detection signal determining unit for determining, as effective, only a detection signal that is first inputted from among a plurality of detection signals which are continuously inputted from the tool cutting edge detecting unit. A signal which is detected until a preset time is elapsed after a first signal is received when the tool comes into contact with the touch sensor, and/or until the tool moves a predetermined distance, is determined as erroneous detection by the detection signal determining unit, and the signal is disenabled.