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4/21/2016 through 2/23/2016

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1 Topics

B. Materials   (1 Topic) (12 Subtopics) (1 Note)   (14 Patent Titles)   (0 Patent Abstracts) (4/21/2016)

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2 Notes

1. Abrasives

2. Bonded Abrasives

 

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2. Bonded Abrasives   

“Abrasives used in machining applications typically include bonded abrasive articles and coated abrasive articles. Coated abrasive articles are generally layered articles having a backing and an adhesive coat to fix abrasive particles to the backing, the most common example of which is sandpaper. Bonded abrasive tools consist of rigid, and typically monolithic, three-dimensional, abrasive composites in the form of wheels, discs, segments, mounted points, hones and other tool shapes, which can be mounted onto a machining apparatus, such as a grinding or polishing apparatus.

Bonded abrasive tools usually have at least two phases including abrasive particles and bond material. Certain bonded abrasive articles can have an additional phase in the form of porosity. Bonded abrasive tools can be manufactured in a variety of `grades` and `structures` that have been defined according to practice in the art by the relative hardness and density of the abrasive composite (grade) and by the volume percentage of abrasive grain, bond, and porosity within the composite (structure).

Some bonded abrasive tools may be particularly useful in grinding and shaping certain types of workpieces, including for example, metals, ceramics and crystalline materials, used in the electronics and optics industries. In other instances, certain bonded abrasive tools may be used in shaping of superabrasive materials for use in industrial applications. In the context of grinding and shaping certain workpieces with metal-bonded abrasive articles, generally the process involves a significant amount of time and labor directed to maintaining the bonded abrasive article. That is, generally, metal-bonded abrasive articles require regular truing and dressing operations to maintain the grinding capabilities of the abrasive article.”

Ramanath et al,  US Patent 9,266,219 (2/23/2016)   

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1. Abrasives

“An abrasive is a material, often a mineral, that is used to shape or finish a workpiece through rubbing which leads to part of the workpiece being worn away. While finishing a material often means polishing it to gain a smooth, reflective surface, the process can also involve roughening as in satin, matte or beaded finishes.

Abrasives are extremely commonplace and are used very extensively in a wide variety of industrial, domestic, and technological applications. This gives rise to a large variation in the physical and chemical composition of abrasives as well as the shape of the abrasive. Common uses for abrasives include grinding, polishing, buffing, honing, cutting, drilling, sharpening, lapping, and sanding (see abrasive machining). (For simplicity, "mineral" in this article will be used loosely to refer to both minerals and mineral-like substances whether man-made or not.)

Files are not abrasives. They remove material not by scratching or rubbing, but by the cutting action of sharp teeth which have been cut into the surface of the file, very much like those of a saw. However, diamond files are a form of coated abrasive (as they are metal rods coated with diamond powder).”

Abrasives, Wikipedia (4/21/2016)

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Copyright 2016 by Roger D. Corneliussen.
No part of this transmission is to be duplicated in any manner or forwarded by electronic mail without the express written permission of Roger D. Corneliussen

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Roger D. Corneliussen, Editor
Professor Emeritus
Materials Engineering
Drexel University, Philadelphia, PA
Editor
Maro Publications
Telephone: 610 363 1533
Email:
cornelrd@bee.net
Website: 
http://maropolymeronline.com/