Machine Tool Vibration Estimation Using Tool-Specific Compensation

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Solution Overview

Problem

Existing vibration characteristic estimation methods for machine tools face challenges in accurately estimating vibration characteristics at target points where sensor attachment is difficult, especially when the tool used differs significantly from the reference tool.

Innovation Solution

A vibration characteristic estimation system that includes a first vibration characteristic acquisition unit, a compensation factor storage unit, and a second vibration characteristic estimation unit. The system acquires a first vibration characteristic from a sensor attached to the machine tool, stores compensation factors based on machine, tool, and gripping tool information, and estimates a second vibration characteristic at the target point using these factors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a sensor is attached to the tool tip to measure vibration characteristics, then the vibration characteristic can be measured directly at the target point, but it becomes difficult to attach the sensor and requires operator skill to determine appropriate attachment position

Engineering Contradiction:

Improvevibration characteristic measurement accuracyVSAvoidsensor attachment difficulty

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The patent uses a sensor attachment position that serves as an intermediary - a location on the machine tool where sensors can be easily attached and from which vibration characteristics can be indirectly measured and calculated to represent the tool tip characteristics, avoiding the need to directly attach sensors to the tool tip

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces direct mechanical sensor attachment at the tool tip with an indirect measurement system using sensors attached to the machine tool structure, combined with calculation algorithms that substitute direct measurement with computed estimation based on measured vibration data and system parameters

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of operation

If compensation values are calculated using a reference tool, then vibration characteristics can be estimated for tools where sensor attachment is difficult, but the estimation accuracy deteriorates when the tool used differs significantly from the reference tool

Engineering Contradiction:

Improvevibration characteristic estimation feasibilityVSAvoidvibration characteristic estimation accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent makes the compensation calculation dynamic by incorporating actual tool parameters (length, diameter, material) into the calculation process. The vibration characteristic estimation is updated based on the specific tool being used, allowing accurate estimation for different tool types while maintaining ease of operation through automated calculations

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameters used in compensation calculations from fixed reference tool parameters to variable parameters that reflect the actual tool being used. By incorporating tool-specific parameters (dimensions, material properties) into the compensation formula, the system maintains accuracy across different tool types while preserving the ease of indirect measurement approach

Inventive Principle:

Principle #35Parameter changes

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

Enables accurate estimation of vibration characteristics at target points in machine tools where sensor attachment is challenging, by compensating the first vibration characteristic using stored compensation factors, thereby improving machining efficiency and accuracy.

Implementation Method 1

a first vibration characteristic acquisition unit acquiring a first vibration characteristic based on an output of a sensor attached to the machine tool when excitation force is applied to a machining point

Methodology Applied

Scientific EffectVibration: Vibration

Data Source

PatentUS20250135595A1Vibration characteristic estimation system in machine tool, machine tool, and vibration characteristic estimation method

Publication Date: 2025.05.01 OKUMA CORP

AI summary

A vibration characteristic estimation system in a machine tool for machining by relatively moving a tool and a workpiece includes: a first vibration characteristic acquisition unit that acquires a first vibration characteristic based on an output of a sensor; a machine information acquisition unit that acquires machine information; a gripping tool information acquisition unit that acquires gripping tool information; a machined portion information acquisition unit that acquires at least one of tool information and workpiece information; a compensation factor acquisition unit that acquires a compensation factor based on at least one of the machine information, the gripping tool information, the tool information, and the workpiece information; and a second vibration characteristic estimation unit that estimates a second vibration characteristic by compensating the first vibration characteristic using the compensation factor, the second vibration characteristic being based on an amount of vibration at a machining point when excitation force is applied.