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1. (WO2018080778) BONDED ABRASIVE ARTICLES INCLUDING ORIENTED ABRASIVE PARTICLES, AND METHODS OF MAKING SAME

Pub. No.:    WO/2018/080778    International Application No.:    PCT/US2017/055822
Publication Date: Fri May 04 01:59:59 CEST 2018 International Filing Date: Wed Oct 11 01:59:59 CEST 2017
IPC: B24D 11/00
B24D 3/02
C09K 3/14
Applicants: 3M INNOVATIVE PROPERTIES COMPANY
Inventors: ADEFRIS, Negus B.
FRANKE, Carsten
SMITHSON, Robert L.W.
GOERS, Brian D.
CASTILLO, Maria Celeste
GIVOT, Maiken
Title: BONDED ABRASIVE ARTICLES INCLUDING ORIENTED ABRASIVE PARTICLES, AND METHODS OF MAKING SAME
Abstract:
The present disclosure provides bonded abrasive articles including abrasive particles retained in a binder. The abrasive particles are oriented at a predetermined angle greater than 0 degrees and less than 90 degrees with respect to a longitudinal axis of the bonded abrasive article. Fifty percent or more of the abrasive particles are oriented within 15 degrees above or below the angle, as measured using microscopy image analysis under magnification. The present disclosure further provides a method of making a bonded abrasive article, the method comprising sequential steps. The steps include (a) a subprocess comprising sequentially: i) depositing a layer of loose powder particles in a confined region, wherein the loose powder particles comprise matrix particles and abrasive particles; ii) spreading the layer of loose powder particles with a spreading bar or roller to provide a substantially uniform thickness, wherein a gap between the spreading bar or roller and a base plane of the confined region is selected to be shorter than an average length of the abrasive particles; and iii) selectively treating an area of the layer of loose powder particles to bond powder particles together. Step b) includes independently carrying out step a) a number of times to generate a bonded abrasive article preform including the bonded powder particles and remaining loose powder particles. Step c) includes separating remaining loose powder particles from the bonded abrasive article preform. Step d) includes heating the bonded abrasive article preform to provide the bonded abrasive article. Further, methods are provided, including receiving, by a manufacturing device having one or more processors, a digital object comprising data specifying a bonded abrasive article; and generating, with the manufacturing device by an additive manufacturing process, a bonded abrasive article preform based on the digital object. A system is also provided, including a display that displays a 3D model of a bonded abrasive article; and one or more processors that, in response to the 3D model selected by a user, cause a 3D printer to create a physical object of a bonded abrasive article preform.