Aqueous Working Fluid for Wire Saw Cutting Accuracy
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Solution Overview
Problem
The existing water-soluble working fluids used for cutting brittle materials like silicon ingots with wire saws fail to provide sufficient cutting accuracy, leading to issues such as wafer flatness reduction and warping, especially when attempting to cut large-diameter wafers.
Innovation Solution
A water-soluble working fluid comprising alkylene oxide adducts of acetylene glycol and glycols, with specific HLB ranges and concentrations, is used to enhance permeability and reduce foaming, ensuring improved cutting accuracy and efficiency for abrasive-grain-fixed wire saws.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the permeability of the working fluid into the work gap is increased, then the cutting accuracy is improved, but the fluid is greatly foamed which impairs the cutting process
Solution Approach 1:
The patent introduces a specific surfactant as an intermediary substance to modify the working fluid's properties. This surfactant acts as a mediator that reduces surface tension and prevents foam formation while maintaining or enhancing the fluid's permeability into the work gap, thereby resolving the contradiction between improved cutting accuracy and excessive foaming
Solution Approach 2:
The patent changes the chemical composition parameters of the working fluid by adding a specific surfactant. This parameter change modifies the fluid's physical properties including surface tension, wetting characteristics, and foam stability, enabling high permeability without excessive foaming that would impair the cutting process
2Strength
If a thick wire is used in the loose abrasive grain method, then the wire strength is sufficient, but a large margin is required generating large amount of cut particles which deteriorates the yield rate
Solution Approach 1:
The patent changes the physical parameters of the working fluid (viscosity, surface tension, permeability) through surfactant addition, enabling effective use of thinner wires by improving fluid penetration and cooling efficiency, thereby reducing wire diameter while maintaining sufficient strength and reducing cut particle generation
3Loss of substance
If the diameter of the wire is reduced in the fixed grain method, then less amount of cut particles are produced, but the cutting accuracy becomes insufficient
Solution Approach 1:
The patent modifies the working fluid parameters by adding surfactant, which enhances permeability and lubrication properties. This enables thinner wires to be used effectively in fixed grain methods, reducing cut particle generation while the improved fluid properties compensate for the reduced wire diameter to maintain sufficient cutting accuracy
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 proposed working fluid achieves favorable cutting accuracy with reduced foam, making it suitable for cutting large-diameter wafers with high precision and increased productivity, particularly for abrasive-grain-fixed wire saws.
Implementation Method 1
the working fluid including: water; an alkylene oxide adduct of acetylene glycol; and glycols
Data Source
AI summary
A water-soluble working fluid of the invention is used for cutting a brittle material using a wire saw. The water-soluble working fluid is provided by blending water, alkylene oxide adduct of acethylene glycol, and glycols. The water-soluble working fluid of the invention is capable of providing favorable cutting accuracy when the brittle material is cut using a wire, and thus is suitable for cutting out a large-diameter wafer. The water-soluble working fluid of the invention is especially suitably applicable to an abrasive-grain-fixed wire saw.