Wire Saw Cutting with AC Electric Field Abrasive Alignment

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Solution Overview

Problem

Existing cutting methods for hard-brittle materials like silicon carbide and diamond in semiconductor ingots face inefficiencies in machining time and quality, with fixed-abrasive-grain methods causing surface damage and loose-abrasive-grain methods being too slow, while both methods incur high costs and material degradation.

Innovation Solution

A cutting method that involves supplying a slurry with abrasive grains having an electrical dielectric property and generating an alternating electric field between the wire tool and the workpiece, allowing the abrasive grains to gather uniformly and maintain smooth cutting efficiency without agglomeration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If fixed-abrasive-grain method is used, then cutting speed is improved, but surface damage increases and machining quality deteriorates

Engineering Contradiction:

Improvecutting speedVSAvoidsurface quality

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent replaces the purely mechanical fixed-abrasive-grain cutting method with a system that incorporates electrical fields. By applying electrical fields to the abrasive grains, the cutting mechanism transitions from mechanical friction to a combination of electrical and mechanical forces, reducing surface damage while maintaining cutting speed.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the physical state and distribution parameters of abrasive grains by applying electrical fields. This causes the abrasive grains to be attracted to and concentrate on the wire surface dynamically, optimizing their distribution and reducing surface damage while maintaining efficient cutting.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If loose-abrasive-grain method is used, then surface quality is improved, but cutting speed decreases and machining time increases

Engineering Contradiction:

Improvesurface qualityVSAvoidcutting speed

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The patent replaces the passive loose-abrasive-grain mechanical system with an electrically active system. Electrical fields actively attract and concentrate loose abrasive grains onto the wire surface, transforming the slow mechanical process into a faster electro-mechanical process that maintains surface quality while improving cutting speed.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces electrical fields as an intermediary mechanism between the loose abrasive grains and the workpiece. This intermediary force efficiently transports and concentrates the abrasive grains onto the wire surface, bridging the gap between loose grain supply and effective cutting action.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If conventional cutting methods are used, then machining can be performed, but material degradation occurs and costs increase

Engineering Contradiction:

Improvecutting capabilityVSAvoidmaterial degradation

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The patent replaces conventional mechanical cutting that causes material degradation with an electro-mechanical cutting system. The electrical fields enable more controlled and precise abrasive grain action, reducing unnecessary mechanical stress and material degradation while maintaining reliable cutting capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

The method enhances machining efficiency and quality by uniformly arranging abrasive grains, reducing machining time and surface damage, particularly for hard materials like silicon carbide, while maintaining or improving the cut surface quality.

Implementation Method 1

supplying a slurry containing abrasive grains having an electrical dielectric property to a region of the workpiece into which the wire tool cuts; generating an alternating electric field in a region between the wire tool and the workpiece

Methodology Applied

Scientific EffectElectrical dielectric property: Dielectric

Implementation Method 2

generating an alternating electric field in a region between the wire tool and the workpiece

Methodology Applied

Scientific EffectAlternating electric field: Electric Field

Data Source

PatentUS12377579B2Cutting method and cutting device

Publication Date: 2025.08.05 AKITA PREFECTURE

AI summary

The cutting method is a cutting method for cutting a workpiece using a wire tool, including: supplying a slurry containing abrasive grains having an electrical dielectric property to a region of the workpiece into which the wire tool cuts; generating an alternating electric field in a region between the wire tool and the workpiece; and running the wire tool along a direction in which the wire tool is drawn while the wire tool abuts on the workpiece.