Machine Tool Motion Evaluation for Visible Machining Marks

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Solution Overview

Problem

Numerically controlled machine tools often produce unwanted streak-like machining marks due to trajectory errors at quadrant glitches or steps, which existing methods fail to fully address by not considering visual characteristics in parameter adjustments.

Innovation Solution

A motion evaluation method that assesses machine tool motion characteristics based on visual characteristics, using a device with a circular motion trajectory data acquisition unit, normal direction change rate calculation, and parameter adjustment to minimize visible defects on the machined surface by adjusting control parameters such as position loop gain and friction compensation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If controller parameters are adjusted to minimize trajectory errors, then manufacturing precision is improved, but the visual appearance of the machined surface may still have visible streak-like marks

Engineering Contradiction:

Improvetrajectory errorVSAvoidvisible machining marks

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The invention changes the evaluation parameter from trajectory error to normal direction change rate, which directly correlates with visual appearance. By adjusting controller parameters based on normal direction change rate rather than trajectory error, the system optimizes for visual quality rather than just geometric accuracy

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention replaces mechanical measurement methods (trajectory error measurement) with visual perception-based evaluation (normal direction change rate calculation). This substitution allows the system to evaluate and optimize for human visual characteristics rather than purely mechanical precision metrics

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Manufacturing precision

If conventional trajectory measurement methods are used, then manufacturing precision can be evaluated, but visual characteristics of the machined surface cannot be assessed

Engineering Contradiction:

Improvetrajectory measurementVSAvoidvisual characteristic information

Core Design Contradiction:

Manufacturing precisionVSLoss of information

Solution Approach 1:

The invention adds a new evaluation dimension by calculating the normal direction change rate, which captures visual appearance characteristics that conventional trajectory measurement misses. This additional dimensional information enables comprehensive assessment of both precision and visual quality

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The invention introduces the normal direction change rate as an intermediary parameter that bridges the gap between mechanical trajectory measurement and visual appearance assessment. This intermediary enables the system to evaluate visual characteristics without directly observing the machined surface

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentEP3582042B1Motion evaluation method, evaluation device, parameter adjustment method using said evaluation method, workpiece machining method, and machine tool

Publication Date: 2024.09.18 MAKINO MILLING MASCH CO LTD

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AI summary

In this motion evaluation method, which uses a circular motion test to evaluate motion characteristics of a numerically controlled machine tool, a normal direction change rate of a trajectory is calculated from a circular motion trajectory, the normal direction change rate of the trajectory is displayed in polar coordinates, and the motion characteristics of the numerically controlled machine tool are evaluated.