Wire-EDM Numerical Control Offset Transition Blocks

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Solution Overview

Problem

Conventional machine tools, particularly wire-electrical discharge machines, face challenges in accurately applying offset values and taper machining amount corrections during machining, leading to inefficiencies and potential gouging due to the inability to seamlessly change offset values and taper angles between blocks, especially in stepped sections and at intersecting points.

Innovation Solution

A numerical control apparatus that adds intermediate blocks at optional distances in front of and behind connecting points between machining path blocks to gradually change offset values and taper angles, ensuring accurate application of these values to the necessary portions of the machining path.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If offset values are changed between machining path blocks, then adaptability to different machining sections is improved, but machining precision deteriorates due to inability to apply offset values accurately at connecting points

Engineering Contradiction:

Improveadaptability to different machining sectionsVSAvoidmachining precision at connecting points

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The machining path blocks are segmented by inserting intermediate blocks at connecting points where offset values change. This segmentation allows the offset value to be applied gradually across multiple smaller blocks rather than abruptly at the connection point, thereby maintaining machining precision while enabling adaptability to different machining sections.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Intermediate machining path blocks are introduced as intermediary elements between original blocks with different offset values. These intermediate blocks serve as mediators that gradually transition the offset value from one block to another, preventing direct abrupt changes that would compromise machining precision at connecting points.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If taper machining amount correction is applied, then manufacturing precision is improved, but device complexity increases due to additional control calculations

Engineering Contradiction:

Improvetaper machining precisionVSAvoidcontrol system complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The taper machining amount correction values are calculated in advance during the machining path creation process. By performing this calculation beforehand rather than during real-time machining, the control system complexity is reduced while still achieving high taper machining precision through pre-computed correction values.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS10442022B2Numerical control apparatus of a wireelectrical discharge machine for machining a workpiece by a wire electrode line along machining path including an offset

Publication Date: 2019.10.15 FANUC LTD

AI summary

In wire-electrical discharge machine and a numerical control apparatus thereof and a numerical control apparatus for controlling a machine tool, optional minute blocks are automatically created in front of and behind a connecting point, which is a joint of a block to which an offset command is instructed, and an offset value is exchanged between the minute blocks so that a correct offset value is set in a desired block.