Coated Abrasive Particle Orientation via Segmented Cavity Tooling

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Solution Overview

Problem

Conventional coated abrasive products face issues with the orientation and spacing of abrasive particles, leading to poor cutting performance and premature wear due to inverted triangular abrasive particles and clustering, which affects metal cutting efficiency and article life.

Innovation Solution

A method using a production tool with precisely replicated cavities complementary to the abrasive particles, eliminating the need for an adhesive layer, allows for controlled orientation and spacing of elongated abrasive particles on a resin-coated backing, ensuring optimal alignment and distribution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional drop coating or electrostatic coating methods are used to apply abrasive particles, then the coating process is simple and cost-effective, but the abrasive particles exhibit random distribution and clustering which leads to poor cutting performance and premature wear

Engineering Contradiction:

Improvespacing and orientation control of abrasive particlesVSAvoidcoating process complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The coating surface is segmented into multiple cavities, each cavity designed to hold exactly one abrasive particle. This segmentation approach transforms the random distribution problem into a controlled placement system, where each cavity acts as an independent positioning unit that ensures proper spacing and orientation of abrasive particles without requiring complex coating equipment

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The cavities are pre-formed in the coating layer before abrasive particles are applied. This preliminary structuring of the coating layer with precisely positioned cavities allows for controlled particle placement, eliminating the need for complex real-time positioning systems during the coating process while achieving uniform distribution and proper orientation

Inventive Principle:

Principle #10Preliminary action

2Reliability

If adhesive layer is used to hold abrasive particles in precision screens, then particle positioning is improved, but the adhesive may detackify over time and transfer to workpieces causing contamination

Engineering Contradiction:

Improveadhesive performance stabilityVSAvoidadhesive transfer and contamination

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The adhesive layer is completely removed from the system. Instead of using adhesive to hold abrasive particles, the invention uses mechanically interlocking cavities that physically retain particles through their geometric shape and fit, eliminating the source of detackification and adhesive transfer contamination entirely

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The cavities are designed to self-retain abrasive particles through their geometric configuration without requiring any additional adhesive materials. The cavity shapes are complementary to particle shapes, creating a self-locking mechanism that maintains particle positioning through the natural fit between cavity and particle geometry

Inventive Principle:

Principle #25Self-service

3Quantity of substance

If high mineral coverage is achieved in conventional coated abrasive products, then the abrasive article has sufficient material, but inverted abrasive particles increase which negatively impacts cut and life especially on metals

Engineering Contradiction:

Improvemineral coverageVSAvoidcut life performance

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

Each cavity is designed with specific local geometric properties that guide abrasive particles into the correct orientation during the coating process. The cavity shapes, orientations, and dimensions are locally optimized to ensure particles assume the desired configuration, preventing inverted orientations even at high coverage levels where conventional methods fail

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11344998B2Method of making a coated abrasive article

Publication Date: 2022.05.31 3M INNOVATIVE PROPERTIES CO

AI summary

The method generally involves the steps of filling the cavities in a production tool each with an individual abrasive particle. Aligning a filled production tool and a resin coated backing for transfer of the abrasive particles to the resin coated backing. Transferring the abrasive particles from the cavities onto the resin coated backing and removing the production tool from the aligned position with the resin coated backing. Thereafter the resin layer is cured, a size coat is applied and cured and the coated abrasive article is converted to sheet, disk, or belt form by suitable converting equipment.