Tool Detection Position Calibration for Machine Tool Length Measurement
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Solution Overview
Problem
Measuring instruments on machine tools are exposed to cutting fluids and dust, which can affect their operation, making it difficult to verify their appropriate functioning during tool tip coordinate identification.
Innovation Solution
A measuring device and program that utilize a standard tool with a known length to identify the tool detection position by controlling its movement, detecting signal states, and identifying the position based on the standard tool's position when the signal is detected, ensuring the measuring instrument operates correctly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the measuring instrument is disposed on the table of the machine tool to measure tool length, then the measurement function is achieved, but the measuring instrument is exposed to cutting fluid and cutting dust which affects its operation reliability
Solution Approach 1:
A standard tool with known length is introduced as an intermediary object to verify the measuring instrument's operation. The standard tool acts as a mediator between the verification process and the measuring instrument, allowing indirect verification without requiring the measuring instrument to be removed from its exposed position on the machine tool table.
2Reliability
If the measuring instrument is used to identify tool tip coordinates, then the measurement function is achieved, but it becomes difficult to verify whether the measuring instrument operates appropriately due to exposure to cutting fluid and dust
Solution Approach 1:
The standard tool is prepared in advance with a known length, and the verification process is performed before actual measurement operations. By conducting the verification measurement preliminarily using the standard tool, the system ensures the measuring instrument is functioning correctly before it is exposed to cutting fluid and dust during actual machining operations.
Solution Approach 2:
The standard tool serves as an intermediary verification object that enables detection of measuring instrument status without requiring direct observation of the instrument's internal operation, thus overcoming the difficulty of verification in the harsh environment.
3Reliability
If the standard tool is moved toward and away from the measuring instrument to verify detection, then the verification capability is improved, but the complexity of the measurement process increases
Solution Approach 1:
The standard tool is moved periodically toward and away from the measuring instrument in a cyclic manner. This periodic movement creates alternating detection and non-detection states that can be easily monitored and verified, simplifying the verification logic despite the physical movement involved.
Solution Approach 2:
Instead of verifying detection by maintaining continuous contact, the system verifies by observing the transition between detected and non-detected states. The verification is achieved by inverting the approach: rather than checking if detection occurs during contact, the system checks if detection ceases when the tool is withdrawn, providing a clear verification signal.
Data Source
AI summary
Provided is a measuring device which, with respect to a measuring instrument for measuring the length of a cutting tool, measures the distance from a reference position of a machine tool to a tool detection position of the measuring instrument. The measuring device comprises: a movement control unit for controlling movement of a standard tool attached to the machine tool; a detection unit for detecting a detection signal indicating a tool detection position output by pressing-down of the measuring instrument; and an identification unit for identifying the tool detection position of the measuring instrument, on the basis of the position of the tip of the standard tool at the timing of detecting the detection signal. The detection unit detects the detection signal indicating that the tip of the standard tool is present within a tool detectable range including the tool detection position. The movement control unit moves the standard tool in a direction away from the measuring instrument to change the state in which the detection signal is detectable by the detection unit to a state in which the detection signal is not detectable by the detection unit, and then moves the standard tool toward the measuring instrument to change the state to a state in which the detection signal is detectable again by the detection unit. The identification unit identifies the tool detection position, on the basis of the position of the standard tool at the timing of detecting the detection signal again.