Servo Axis Inversion Position Display on Tool Trajectory
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Solution Overview
Problem
In machine tools with multiple servo axes, including rotation axes, it is challenging to accurately determine the inversion position of each axis, which complicates servo adjustments and shape error analysis due to the complexity of coordinate conversions and the inability to clearly distinguish between shape errors caused by polarity changes and other factors.
Innovation Solution
A tool trajectory display device that calculates and displays the inversion position of servo axes on the tool center point's trajectory, using position and velocity information from numerical controllers or detectors, and employs different marks, display attributes, or indicators to visually represent polarity changes, allowing for clear identification of inversion points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If coordinate conversion is performed to represent tool center point coordinates in a three-axis coordinate system, then the tool trajectory can be displayed, but the inversion position of each axis cannot be determined due to multiple variables involved
Solution Approach 1:
The patent segments the tool trajectory display into two separate components: displaying the tool center point trajectory based on NC data, and separately displaying the inversion positions of individual servo axes. This segmentation allows the inversion positions to be identified independently without being obscured by coordinate conversion complexities.
Solution Approach 2:
The patent introduces an intermediary display mechanism that maps inversion positions of servo axes onto the tool trajectory display. By using visual markers or indicators that represent inversion positions superimposed on the trajectory, the system enables simultaneous display of both trajectory information and axis inversion positions without requiring complex coordinate conversions.
2Ease of operation
If the tool trajectory is displayed based on NC data alone, then the commanded trajectory can be shown, but the actual trajectory and inversion positions cannot be identified for proper servo adjustment
Solution Approach 1:
The patent merges multiple information sources into a single integrated display: NC data (commanded trajectory), actual tool center point coordinates, and servo axis inversion positions are combined and displayed together. This unified display enables operators to simultaneously view commanded and actual trajectories along with inversion positions, facilitating accurate servo adjustment.
Solution Approach 2:
The system provides feedback by displaying actual tool center point coordinates and inversion positions alongside the commanded trajectory from NC data. This feedback mechanism allows operators to compare commanded versus actual behavior and identify inversion positions that may cause shape errors, enabling proper servo adjustment.
3Manufacturing precision
If mechanical play and servo response delay are considered to reduce shape error, then processing accuracy can be improved, but it is difficult to determine whether shape errors are caused by inversion motion or other factors in multi-axis machines
Solution Approach 1:
The patent uses visual indicators or markers (analogous to color changes) to highlight inversion positions on the tool trajectory display. By visually marking where inversion occurs, operators can easily identify positions where polarity changes happen and correlate them with shape errors, preventing loss of information about error sources.
Solution Approach 2:
The system performs preliminary identification and display of inversion positions before servo adjustment is performed. By showing inversion positions in advance on the trajectory display, operators can proactively adjust servo parameters at the correct positions, rather than trying to diagnose errors after processing.
Data Source
AI summary
A tool trajectory display device capable of displaying an inversion position of a servo axis on a tool trajectory. The display device has a position information obtaining part and velocity information obtaining part which obtain position information and velocity information of at least one servo axis, respectively, from numerical controller; a tool coordinate calculating part which calculates a coordinate value of a tool center point based on the position information and information of a mechanical constitution of the machine tool; an inversion position calculating part which calculates an inversion position where a polarity of a velocity of the servo axis is changed, based on the velocity information and the calculated coordinate value; and a displaying part which displays a trajectory of the tool center point based on the calculated coordinate, and displays the inversion position of the servo axis on the trajectory.