Saint-gobain Abrasives, Inc.

Saint-gobain Abrasifs

Michael W Klett

Emmanuel C Francois

Steven F Parsons

Arup K Khaund

Frank J Csillag

Muthu Jeevanantham

Dean S Matsumoto

Han Zhang

Anne M Bonner

Karen M Conley

Konstantin S Zuyev

Boris L Serebrennikov

Lawrence J Lavallee, Jr

Guohua Zhang

Tyler B Cichowlas

Davinder S Dhami

An abrasive tool can have a body including an abrasive portion with abrasive grains contained within a matrix material. A first reinforcing member can be contained within the body. The body can also include a porosity variation difference through at least half of a thickness of the body of not greater than 250% from a mean porosity of the body.

Abrasive tool having a particular porosity variation

An abrasive article has an abrasive portion with a bond and abrasive particles. A core is mounted to the abrasive portion. The core may include a plurality of segments that are interconnected to form the core. The abrasive article may include forming a plurality of core segments; assembling the core segments into a core; and then mounting the core to the abrasive portion to form the abrasive article. Forming an abrasive article may include mixing a phenolic resin, fillers and abrasive particles to form an abrasive matrix; injecting the abrasive matrix directly into a mold, such that the abrasive matrix is injection molded into a final wheel geometry; at least partially curing the abrasive matrix while it is inside the mold; and then removing the abrasive article from the mold.

Abrasive article and method of making same

An abrasive article has an abrasive portion with an organic bond and abrasive particles. The abrasive article has a non-abrasive portion (NAP) mounted to the abrasive portion. The NAP includes molding compound (MC) having chopped strand fibers (CSF). The CSF can be coated with a thermoplastic coating having a loss on ignition (LOI) of at least about 2.4 wt %, and the NAP having no abrasive particles. The NAP can include an MC having no abrasive particles with a MOHS scale hardness of at least about 9. The NAP may include CSF coated with a primary coating and a secondary coating on the primary coating. The NAP may have an outer diameter that is at least half of but not greater than an outer diameter of the abrasive article.

Abrasive article

An abrasive article has an abrasive portion and chopped strand fibers (CSF) with enhanced strength and/or fracture of toughness. The CSF may be coated with a thermoplastic having a loss on ignition of at least about 2 wt %. The CSF can have a primary coating and a secondary coating on the primary coating. At least some of the CSF can have a length of at least about 6.3 mm.

Abrasive article reinforced by discontinuous fibers

A composition that can be used for abrasive processing is disclosed. The composition includes an organic bond material, an abrasive material dispersed in the organic bond material, and a plurality of microfibers uniformly dispersed in the organic bond material. The microfibers are individual filaments having an average length of less than about 1000 &#x3bc;m. Abrasive articles made with the composition exhibit improved strength and impact resistance relative to non-reinforced abrasive tools, and improved wheel wear rate and G-ratio relative to conventional reinforced tools. Active fillers that interact with microfibers may be used to further abrasive process benefits.

Microfiber reinforcement for abrasive tools

An abrasive tool having a body including an abrasive portion having abrasive grains contained within a matrix material and porosity characterized by a bimodal distribution of pores including large pores having an average large pore size (P) and small pores having an average small pore size (P), wherein P&#x3e;P. The body of the abrasive tool further includes a first reinforcing member contained within the abrasive portion, and a percent thermal expansion over a temperature range for 25&#xb0; C. to 450&#xb0; C. of not greater than about 0.7%.

Abrasive tool having controlled porosity distribution

Bonded abrasive tools, e.g., grinding wheels, can be reinforced using, for instance, one or more fiberglass web(s) having a surface of glass per unit of at least 0.2. Alternatively or in addition, the fiberglass web has a thickness of 2 mm or less. The web can be designed to provide improved adhesion between the fiberglass reinforcement and the mixture employed to form the bonded abrasive tool. In some examples, the middle reinforcement at the neutral zone of the wheel can be eliminated or minimized.

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Holden, MA, United States of America

Michael W Klett