Machine Tool Swing Control for Selecting Oscillation Conditions

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Solution Overview

Problem

Existing control devices for machine tools require time-consuming adjustments of oscillation conditions, including frequency and amplitude, due to variations in tools, machining methods, and shapes, and previous methods fail to determine optimal oscillation conditions effectively.

Innovation Solution

A control device with a storage unit that stores correspondence relationships between machining conditions and oscillation conditions, an oscillation condition determination unit that selects appropriate oscillation conditions based on these relationships, and an oscillation command generation unit that generates commands for machining, allowing for easier and more accurate determination of oscillation conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If oscillation conditions are manually reset and fine-tuned for each machining program, then appropriate oscillation conditions can be determined, but the process becomes time-consuming

Engineering Contradiction:

Improveappropriateness of oscillation conditionsVSAvoidtime for resetting and fine-tuning

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by pre-calculating and storing optimal oscillation conditions in a lookup table before machining operations begin. The storage unit contains pre-computed oscillation frequencies and amplitudes corresponding to various machining parameters, eliminating the need for time-consuming manual adjustment during actual machining setup

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The control device performs self-service by automatically determining oscillation conditions through the oscillation condition determination unit, which queries the storage unit based on machining parameters and generates oscillation commands without requiring manual operator intervention for each machining program

Inventive Principle:

Principle #25Self-service

2Productivity

If oscillation frequency is calculated from workpiece diameter and chip length, then some oscillation conditions can be determined, but the conditions are not appropriate due to ignoring tool, machining method, and shape variations

Engineering Contradiction:

Improveease of determining oscillation conditionsVSAvoidappropriateness of oscillation conditions

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies parameter changes by expanding the oscillation condition determination to consider multiple machining parameters simultaneously. The storage unit stores oscillation conditions corresponding to combinations of workpiece specifications, tool specifications, machining methods, and machining shapes, allowing the system to select appropriate conditions based on the specific combination of parameters for each machining operation

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The control device achieves universality by creating a comprehensive lookup table that covers multiple machining scenarios and parameters. The oscillation condition determination unit can handle various machining programs with different workpieces, tools, methods, and shapes using a single unified system, making the device adaptable to diverse machining requirements

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Device complexity

If oscillation amplitude cannot be determined together with oscillation frequency, then frequency calculation is simpler, but optimal oscillation conditions cannot be determined due to blade edge oscillation variations

Engineering Contradiction:

Improvesimplicity of frequency calculationVSAvoidoptimality of oscillation conditions

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent applies merging by combining the determination of both oscillation frequency and oscillation amplitude into a single unified process. The storage unit stores both parameters together as corresponding oscillation conditions, and the oscillation condition determination unit retrieves both values simultaneously, ensuring that both frequency and amplitude are optimized together for each machining scenario

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20230037816A1Control device for machine tool

Publication Date: 2023.02.09 FANUC LTD

AI summary

Provided is a control device for a machine tool, the control device being capable of more appropriately and easily determining a swing condition. A control device 10 for a machine tool for swinging a work piece and a tool relatively to each other to perform machining, the control device 10 comprising a storage unit 15 which stores correspondence between a machining condition and a swing condition, the machining condition being at least one of specifications of the work piece, specifications of the tool, a machining method and a machining shape, a swing condition determination unit 16 which selects a swing condition to be used for the machining on the basis of the correspondence stored in the storage unit 15, and a swing command generation unit 18 which generates a swing command on the basis of the swing condition selected by the swing condition determination unit 16.