A polishing pad material purification system includes a melting device configured to melt a solid material put therein, and a homogenizer configured to homogenize the material melted in the melting device. The homogenizer is configured to have a processable amount of material to be homogenized larger than a processable amount of material to be melted by the melting device and configured to stir the material melted in the melting device so as to homogenize it.

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.

A rotary abrasive machining tool (101) is shown. The tool comprises a hub (103) having plurality of axially-oriented radial slots in the outer circumference thereof, and plurality of abrasive segments each of which is located in a respective slot in the hub and which form an abrading surface (102). The abrasive segments comprise a tab for location in a slot in the hub, and an abrading edge defining a plurality of abrasive elements.

A method of additive manufacturing for manufacturing an abrasive article (1) layer-by-layer. The method comprises depositing a layer of slurry (4), wherein the slurry (4) comprises a mixture comprising a liquid and abrasive particles, and applying a radiation source (6) on the layer of slurry (4) for curing thereof before depositing a new layer of slurry (4), wherein the radiation source (6) comprises a rotating exposure. In a further aspect, an additive manufacturing apparatus for manufacturing an abrasive article (1) layer-by-layer is also provided.

A mirror finishing method for forming a mirror surface on a workpiece with a mirror finishing tool including a conically shaped cutting tool made of polycrystalline diamond or cubic boron nitride that is attached to a distal end of a shank, performs mirror polishing by abutting a conical surface of the cutting tool against a machined surface of the workpiece with the shank tilted with respect to the machined surface of the workpiece.

A method of fabricating a polishing layer of a polishing pad includes successively depositing a plurality of layers with a 3D printer, each layer of the plurality of polishing layers deposited by ejecting a pad material precursor from a nozzle and solidifying the pad material precursor to form a solidified pad material.

A method of processing a polycrystalline diamond element is disclosed. The method may include depositing a vaporized material over a selected portion of a polycrystalline diamond element to form a protective coating over the selected portion. The polycrystalline diamond element may include a polycrystalline diamond table. The method may also include exposing at least a portion of the polycrystalline diamond element to a leaching solution such that the leaching solution contacts an exposed surface region of the polycrystalline diamond table and at least a portion of the protective coating. The method may also include removing the polycrystalline diamond element from the leaching solution. The protective coating may be substantially impermeable to the leaching solution.

This invention relates to an object comprised of a plurality of fused filaments of a polyester material that includes units of a diacid component and units of a glycol component. The co-polyester has a zero shear viscosity no greater than about 3000, an elongation at break of at least about 75%, a density no greater than about 1.25 g/cm3, a glass transition temperature of at least about 80? C., an inherent viscosity from about 0.55 dL/g to about 0.7 dig, a density no greater than about 1.25 g/cm3, and a crystallization half-time no greater than about 300 minutes.

The object of the present invention is to provide a grinding tool capable of continuing machining in a dry state and of being manufactured in a short time and at low cost, and a manufacturing method therefor. For said purpose, a grinding tool (10-1) for grinding a workpiece includes a threaded helical groove (12) formed on an outer circumferential surface of a cylindrical metal head portion (10b), ridgetop surfaces that result from the formation of the helical groove (12) and are formed so as to protrude with a trapezoidal cross-sectional shape, and abrasive grain surfaces (18) formed by winding an insulating resin rope in the helical groove (12) to mask the inside of the helical groove (12) and fixing abrasive grains on the ridgetop surfaces. A helix angle of the helical groove (12) with respect to an axial direction of the grinding tool (10-1) is set to be at least 80 and less than 90.

A method of fabricating a polishing layer of a polishing pad includes successively depositing a plurality of layers with a 3D printer, each layer of the plurality of polishing layers deposited by ejecting a pad material precursor from a nozzle and solidifying the pad material precursor to form a solidified pad material.