Numerical Controller Reestablishing Machine Coordinates via Absolute Detector
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Solution Overview
Problem
Existing numerical controllers face challenges in safely and efficiently reestablishing machine coordinate values after power activation, leading to deviations between machine coordinate values and absolute position detector positions, requiring manual operations and increasing costs due to mechanical fixing needs for gravity axes.
Innovation Solution
A numerical controller with an axis stop unit, machine coordinate value updating unit, and absolute coordinate value updating unit that allows for rapid reestablishment of machine coordinate values through signal operations without interrupting operations, enabling safe and cost-effective reestablishment even in free states of servo motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the machine origin is established from the unestablished state using the absolute position detector, then the position information on the absolute position detector side is updated, but the relationship between the actual machine position and the position information is reset, requiring manual operation to move to the machine origin
Solution Approach 1:
The numerical controller automatically performs the reestablishment of machine coordinate values by acquiring position information from the absolute position detector and updating coordinates without requiring manual operation to move to the machine origin. The system serves itself by automatically synchronizing the machine coordinate system with the absolute position detector readings.
2Ease of operation
If the servo motor is operated by speed control without position control, then the servo motor can move freely, but the machine coordinate value may not be updated, causing deviation between machine coordinate value and absolute position detector position
Solution Approach 1:
The numerical controller acquires position information from the absolute position detector and uses it to update machine coordinate values, creating a feedback mechanism that ensures coordinate accuracy even when the servo motor operates in speed control mode without position control.
3Reliability
If a device for mechanically fixing the gravity axis is added to prevent falling in free state, then the safety is improved, but the cost increases
Solution Approach 1:
The patent replaces the need for mechanical fixing devices with a control-based solution. The numerical controller acquires position information from the absolute position detector and updates machine coordinate values, allowing the system to safely operate in the free state without additional mechanical fixing hardware.
4Measurement precision
If the machine needs to be stopped once to reestablish coordinates, then the coordinate accuracy is improved, but continuous work becomes difficult
Solution Approach 1:
The numerical controller can acquire position information from the absolute position detector and update machine coordinate values without stopping the machine. This allows continuous operation to be maintained while ensuring coordinate accuracy through automatic updates based on absolute position detector readings.
Data Source
AI summary
A numerical controller for controlling a machine receives an instruction to reestablish a machine coordinate value of a movable part of the machine and stops a servo motor driving the movable part. When the servo motor is stopped, the numerical controller acquires position information of a position detector provided to the servo motor. Then, the numerical controller updates the machine coordinate value of the movable part based on the position information, and further updates the absolute coordinate value of the movable part based on the updated machine coordinate value.