A method of forming a vitreous bond abrasive article is presented that includes receiving, by a manufacturing device having one or more processors, a digital object comprising data specifying a plurality of layers of a vitreous bond abrasive article precursor. The vitreous bond abrasive article precursor includes abrasive particles bonded together by a vitreous bond precursor material and an organic compound. The vitreous bond abrasive article precursor further comprises at least one of: at least one tortuous cooling channel extending at least partially through the vitreous bond abrasive article precursor or at least one arcuate cooling channel extending at least partially through the vitreous bond abrasive article precursor. The method also includes generating, with the manufacturing device by an additive manufacturing process, the vitreous bond abrasive article precursor based on the digital object.

A shaped abrasive agglomerate particle includes a shaped abrasive particle bonded in a vitreous matrix. The shaped abrasive particles have a longest particle lineal dimension on a surface and a shortest particle dimension perpendicular to the longest particle lineal dimension, and the longest particle lineal dimension is at least twice the shortest particle dimension. The shaped abrasive agglomerate particle has a longest agglomerate lineal dimension on a surface and a shortest agglomerate dimension perpendicular to the longest agglomerate lineal dimension, and the longest agglomerate lineal dimension is at least twice the shortest agglomerate dimension. The abrasive agglomerate particles are useful in abrasive articles. Methods of making the shaped abrasive agglomerate particle and abrading a workpiece are also described.

A method for manufacturing a bonded abrasive article is presented. The method includes preparing a bondable abrasive composition including abrasive particles, a binder medium and an environmentally benign pore inducing material. The environmentally benign pore inducing material is nonflammable. The method also includes forming a precursor abrasive structure from the bondable abrasive composition. The method also includes removing the pore inducing material from the precursor abrasive structure to provide a porous precursor abrasive structure. The method also includes processing the porous precursor abrasive structure to provide a bonded abrasive article.

A method for manufacturing a bonded abrasive article is presented. The method includes preparing a bondable abrasive composition including abrasive particles, a binder medium and an environmentally benign pore inducing material. The environmentally benign pore inducing material is nonflammable. The method also includes forming a precursor abrasive structure from the bondable abrasive composition. The method also includes removing the pore inducing material from the precursor abrasive structure to provide a porous precursor abrasive structure. The method also includes processing the porous precursor abrasive structure to provide a bonded abrasive article.

A radial grinding tool for a machining center utilizing through-spindle coolant is disclosed and includes a main body having a central longitudinal axis, a spindle extending along the central longitudinal axis, a disc-shaped wheel member located at an end of the spindle and including a working surface at a periphery of the wheel member, and a passageway extending through the main body configured to accommodate a flow of coolant. The tool includes an impeller attached at a lower side of the wheel member and having a plurality of blades that are configured to impart a force against the coolant to reshape the flow of coolant into a generally flat stream and redirect and drive the coolant radially outward from the central longitudinal axis to the working surface.

A radial grinding tool for a machining center utilizing through-spindle coolant is disclosed and includes a main body having a central longitudinal axis, a spindle extending along the central longitudinal axis, a disc-shaped wheel member located at an end of the spindle and including a working surface at a periphery of the wheel member, and a passageway extending through the main body configured to accommodate a flow of coolant. The tool includes an impeller attached at a lower side of the wheel member and having a plurality of blades that are configured to impart a force against the coolant to reshape the flow of coolant into a generally flat stream and redirect and drive the coolant radially outward from the central longitudinal axis to the working surface.

Shaped ceramic abrasive particles include a first surface having a perimeter having a perimeter comprising at least first and second edges. A first region of the perimeter includes the second edge and extends inwardly and terminates at two corners defining first and second acute interior angles. The perimeter has at most four corners that define acute interior angles. A second surface is disposed opposite, and not contacting, the first surface. A peripheral surface is disposed between and connects the first and second surfaces. The peripheral surface has a first predetermined shape. Methods of making the shaped ceramic abrasive particles, and abrasive articles including them are also disclosed.

Shaped ceramic abrasive particles include a first surface having a perimeter having a perimeter comprising at least first and second edges. A first region of the perimeter includes the second edge and extends inwardly and terminates at two corners defining first and second acute interior angles. The perimeter has at most four corners that define acute interior angles. A second surface is disposed opposite, and not contacting, the first surface. A peripheral surface is disposed between and connects the first and second surfaces. The peripheral surface has a first predetermined shape. Methods of making the shaped ceramic abrasive particles, and abrasive articles including them are also disclosed.

Magnetizable abrasive particles are described comprising ceramic particles having outer surfaces comprising a coating of unsintered polyion and magnetic particles bonded to the polyion. In favored embodiments, the magnetic particles have a magnetic saturation of at least 10, 15, 20, 25, 30, 35, 40, 45 or 50 emu/gram. In another embodiment, an abrasive article is described comprising a plurality of magnetizable abrasive particles as described herein retained in a binder material. Also described are method of making magnetizable abrasive particles and methods of making an abrasive article comprising magnetizable abrasive particles.

Magnetizable abrasive particles are described comprising ceramic particles having outer surfaces comprising a coating of unsintered polyion and magnetic particles bonded to the polyion. In favored embodiments, the magnetic particles have a magnetic saturation of at least 10, 15, 20, 25, 30, 35, 40, 45 or 50 emu/gram. In another embodiment, an abrasive article is described comprising a plurality of magnetizable abrasive particles as described herein retained in a binder material. Also described are method of making magnetizable abrasive particles and methods of making an abrasive article comprising magnetizable abrasive particles.