In a high-porosity CBN vitrified grinding stone having a homogeneous structure, a CBN abrasive grain, a large-diameter inorganic hollow filler having an average particle diameter in a range from a grain size one class coarser to a grain size one class finer with respect to a class indicating a grain size of the CBN abrasive grain, and a small-diameter inorganic hollow filler having an average particle diameter of ⅕ to ½ of that of the CBN abrasive grain are bonded by an inorganic bonding agent.

In a high-porosity CBN vitrified grinding stone having a homogeneous structure, a CBN abrasive grain, a large-diameter inorganic hollow filler having an average particle diameter in a range from a grain size one class coarser to a grain size one class finer with respect to a class indicating a grain size of the CBN abrasive grain, and a small-diameter inorganic hollow filler having an average particle diameter of ⅕ to ½ of that of the CBN abrasive grain are bonded by an inorganic bonding agent.

An abrasive article comprises an abrasive portion having an annular shape defined by an inner annular surface, the abrasive portion including abrasive particles contained in a bond material, and wherein the abrasive portion comprises at least one circumferential groove in an outer annular surface; and a backing coupled to the inner annular surface of the abrasive portion.

A double-sided flap disc for use on a mounted grinder. A carrier plate has abrasive flaps attached around its outer perimeter on both sides. The flaps are arranged so that each side mirrors the other, that is, the flaps attached to one side face clockwise and the flaps attached to the other side face counterclockwise. This allows a U-shaped workpiece, such as a horseshoe, to be moved side to side against both sides of the disc, to provide symmetrical grinding.

A manufacturing method comprises the following steps. A shape of a first cross-section of a to-be-ground portion of a workpiece to be ground by a grinding wheel is obtained. The grinding wheel is manufactured according the shape of the first cross-section. When the to-be-ground portion is contacted and to be ground by the grinding surface, a first intersection line formed by the first cross-section and one of reference planes has a first length, second intersection lines formed by the grinding surface and one of the reference planes have second lengths, and all ratios between the first length of the first intersection line and a sum of the second lengths of the second intersection lines formed by the same reference plane are equal to each other. The reference planes are perpendicular to the rotation axis of the grinding wheel.

A manufacturing method comprises the following steps. A shape of a first cross-section of a to-be-ground portion of a workpiece to be ground by a grinding wheel is obtained. The grinding wheel is manufactured according the shape of the first cross-section. When the to-be-ground portion is contacted and to be ground by the grinding surface, a first intersection line formed by the first cross-section and one of reference planes has a first length, second intersection lines formed by the grinding surface and one of the reference planes have second lengths, and all ratios between the first length of the first intersection line and a sum of the second lengths of the second intersection lines formed by the same reference plane are equal to each other. The reference planes are perpendicular to the rotation axis of the grinding wheel.

The present disclosure provides methods of making a vitreous bond abrasive article and a metal bond abrasive article. The methods include sequential steps. Step a) includes a subprocess including sequentially: i) depositing a layer of loose powder particles in a confined region; and ii) selectively applying heat via conduction or irradiation, to heat treat an area of the layer of loose powder particles. The loose powder particles include abrasive particles and organic compound particles, as well as vitreous bond precursor particles or metal particles. The layer of loose powder particles has substantially uniform thickness. Step b) includes independently carrying out step a) a number of times to generate an abrasive article preform comprising the bonded powder particles and remaining loose powder particles. Step c) includes separating remaining loose powder particles from the abrasive article preform. Step d) includes heating the abrasive article preform to provide the vitreous bond abrasive article comprising the abrasive particles retained in a vitreous bond material, or to provide the metal bond abrasive article. A method of making a metal bond abrasive optionally includes infusing an abrasive article preform with a molten lower melting metal and solidifying the molten lower melting metal to provide the metal bond abrasive article. The present disclosure further provides a vitreous bond abrasive article precursor and a metal bond abrasive article precursor. Also, methods including receiving, by a manufacturing device having a processor, a digital object specifying data for an abrasive article, and generating the abrasive article with the manufacturing device.

The present disclosure provides methods of making a vitreous bond abrasive article and a metal bond abrasive article. The methods include sequential steps. Step a) includes a subprocess including sequentially: i) depositing a layer of loose powder particles in a confined region; and ii) selectively applying heat via conduction or irradiation, to heat treat an area of the layer of loose powder particles. The loose powder particles include abrasive particles and organic compound particles, as well as vitreous bond precursor particles or metal particles. The layer of loose powder particles has substantially uniform thickness. Step b) includes independently carrying out step a) a number of times to generate an abrasive article preform comprising the bonded powder particles and remaining loose powder particles. Step c) includes separating remaining loose powder particles from the abrasive article preform. Step d) includes heating the abrasive article preform to provide the vitreous bond abrasive article comprising the abrasive particles retained in a vitreous bond material, or to provide the metal bond abrasive article. A method of making a metal bond abrasive optionally includes infusing an abrasive article preform with a molten lower melting metal and solidifying the molten lower melting metal to provide the metal bond abrasive article. The present disclosure further provides a vitreous bond abrasive article precursor and a metal bond abrasive article precursor. Also, methods including receiving, by a manufacturing device having a processor, a digital object specifying data for an abrasive article, and generating the abrasive article with the manufacturing device.

The present disclosure provides methods of making a vitreous bond abrasive article and a metal bond abrasive article. An abrasive article preform is produced by an additive manufacturing sub-process comprising the deposition of a layer of loose powder particles in a confined region and selective heating via conduction or irradiation to heat treat an area of the layer of loose powder particles. The loose powder particles include abrasive particles and organic compound particles, as well as vitreous bond precursor particles or metal particles. The abrasive article preform produced by additive manufacturing is subsequently heated to provide the vitreous bond abrasive article comprising the abrasive particles retained in a vitreous bond material, or to provide the metal bond abrasive article. Also, the methods include receiving, by an additive manufacturing device having a processor, a digital object specifying data for an abrasive article, and generating the abrasive article with the manufacturing device.

The present disclosure provides methods of making a vitreous bond abrasive article and a metal bond abrasive article. An abrasive article preform is produced by an additive manufacturing sub-process comprising the deposition of a layer of loose powder particles in a confined region and selective heating via conduction or irradiation to heat treat an area of the layer of loose powder particles. The loose powder particles include abrasive particles and organic compound particles, as well as vitreous bond precursor particles or metal particles. The abrasive article preform produced by additive manufacturing is subsequently heated to provide the vitreous bond abrasive article comprising the abrasive particles retained in a vitreous bond material, or to provide the metal bond abrasive article. Also, the methods include receiving, by an additive manufacturing device having a processor, a digital object specifying data for an abrasive article, and generating the abrasive article with the manufacturing device.