Machining Result Evaluation With Servo Feedback Simulation

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Solution Overview

Problem

Existing machining simulation techniques fail to accurately evaluate machining results due to the lack of consideration for the response from the machine tool or servo control device to the numerical control device.

Innovation Solution

A machining result evaluation device that simulates the operation of a numerical control device, a servo control device, and a drive shaft, allowing for the evaluation of machining results based on the simulated feedback control and operation of these components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If machining simulation is performed based on position command from numerical control device, then machining process can be evaluated, but accuracy of machining result evaluation deteriorates due to lack of feedback control simulation

Engineering Contradiction:

Improvemachining result evaluation accuracyVSAvoidsimulation system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent implements feedback control simulation by introducing a virtual servo control device that receives position commands from the numerical control simulation and generates torque commands based on simulated feedback from the drive shaft simulation. This feedback mechanism allows the system to accurately evaluate machining results by considering the actual control loop behavior, resolving the contradiction between evaluation accuracy and system complexity.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent creates virtual copies of the actual control system components (numerical control device, servo control device, and drive shaft) in the simulation environment. These virtual models replicate the behavior of the physical system, enabling accurate machining result evaluation without requiring the actual expensive and complex physical test setup.

Inventive Principle:

Principle #26Copying

2Measurement precision

If feedback control simulation is added to the machining simulation, then machining result evaluation accuracy is improved, but calculation time increases

Engineering Contradiction:

Improvemachining result evaluation accuracyVSAvoidcalculation time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent replaces the physical mechanical control system with a virtual simulation model that calculates the same control behavior through mathematical computations. This substitution allows for rapid iteration and evaluation of different machining scenarios without the time-consuming process of physical testing, while maintaining high accuracy through the detailed feedback control simulation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS20250068138A1Machining result evaluation device, machining result evaluation method, machining condition determination device, and machining condition determination method

Publication Date: 2025.02.27 MITSUBISHI ELECTRIC CORP

AI summary

An evaluation device for evaluating a result of machining includes a numerical control simulation unit that simulates a numerical control device, and outputs a position command to a drive shaft of the machine tool. Further, there is a servo control simulation unit that simulates the servo control device based on the position command and outputs a torque command to the drive shaft; a drive shaft simulation unit that simulates the drive shaft based on the torque command, and a machining result evaluation unit that evaluates a machining result based on information corresponding to an operation of the drive shaft. The drive shaft simulation unit outputs position information indicating a position of the drive shaft, the servo control simulation unit performs feedback control of the drive shaft simulation unit by using the position information, and the machining result evaluation unit evaluates a machining result obtained when the feedback control is simulated.