Polymer bond abrasive articles and methods of making them

Patent metadata

Field	Value
Publication number	US-11623324-B2
Application number	US-201716467132-A
Country	US
Kind code	B2
Filing date	Dec 13, 2017
Priority date	Dec 23, 2016
Publication date	Apr 11, 2023
Grant date	Apr 11, 2023

Abstract

Methods of making polymer bond abrasive articles and their precursors using powder bed jetting are disclosed. Polymer bond abrasive articles prepared by the method include abrasive articles having arcuate or tortuous cooling channels, unitary structured abrasive discs, abrasive segments, shaped abrasive particles, and abrasive wheels.

First claim

The invention claimed is:

1. A method of making an abrasive article, comprising:
a) a subprocess, comprising:
i) depositing a layer of loose powder particles in a confined region, wherein the loose powder particles comprise polymer bond precursor particles and abrasive particles, and wherein the layer of loose powder particles has substantially uniform thickness;
ii) applying a liquid binder precursor material in predetermined regions of the layer of loose powder particles; and
iii) converting the liquid binder precursor material into a temporary binder material, wherein the temporary binder material bonds to at least a portion of the polymer bond precursor particles and the abrasive particles in the predetermined regions to form a layer of bonded powder particles;

b) independently carrying out step a) a plurality of times to generate an abrasive article preform comprising the bonded powder particles and remaining loose powder particles, wherein in each step a), the loose powder particles are independently selected and the liquid binder precursor material is independently selected; and
c) converting the polymer bond precursor particles in the abrasive article preform into polymer bond particles, wherein the polymer bond particles retain the abrasive particles to form a polymer bond abrasive article, and
wherein the liquid binder precursor material comprises a liquid carrier having a polymer dissolved or dispersed therein.

2. The method of claim 1 , wherein the abrasive particles comprise at least one of diamond particles, cubic boron nitride particles, or metal oxide ceramic particles.

3. The method of claim 1 , further comprising separating substantially all the remaining loose powder particles from the abrasive article preform prior to the converting step (c).

4. The method of claim 1 , wherein the loose powder particles comprise submicron ceramic particles.

5. The method of claim 1 , wherein the polymer bond precursor particles are chosen from urethane resins, epoxy resins, phenolic resins, and combinations thereof.

6. The method of claim 1 , wherein the converting step (c) comprises heating the abrasive article preform to a temperature sufficient to at least partially soften the polymer bond precursor particles to form the polymer bond particles.

7. The method of claim 1 , wherein the converting step (c) comprises heating the abrasive article preform to a temperature sufficient to polymerize the polymer bond precursor particles to form the polymer bond particles.

8. The method of claim 1 , wherein the converting step (c) comprises heating a selected portion of the abrasive article preform to a temperature sufficient to at least partially soften the polymerize the polymer bond precursor particles to form the polymer bond particles.

9. The method of claim 1 , wherein the abrasive article preform is heated to a temperature of about 150° C. to about 250° C.

10. The method of claim 1 , wherein the converting step (c) comprises applying a polymerizing agent to the abrasive article preform to at least partially polymerize the polymer bond precursor particles to from polymer bond particles.

11. The method of claim 1 , further comprising heating the loose powder particles prior to step (a)(ii).

12. A method of making an abrasive article, comprising:
a) a subprocess, comprising:
i) depositing a layer of loose powder particles in a confined region, wherein the loose powder particles comprise polymer bond precursor particles and abrasive particles, and wherein the layer of loose powder particles has substantially uniform thickness;
ii) applying a liquid binder precursor material in predetermined regions of the layer of loose powder particles; and
iii) converting the liquid binder precursor material into a temporary binder material, wherein the temporary binder material bonds to at least a portion of the polymer bond precursor particles and the abrasive particles in the predetermined regions to form a layer of bonded powder particles;

b) independently carrying out step a) a plurality of times to generate an abrasive article preform comprising the bonded powder particles and remaining loose powder particles, wherein in each step a), the loose powder particles are independently selected and the liquid binder precursor material is independently selected; and
c) converting the polymer bond precursor particles in the abrasive article preform into polymer bond particles, wherein the polymer bond particles retain the abrasive particles to form a polymer bond abrasive article; and
wherein converting step (c) comprises heating a selected portion of the abrasive article preform to a temperature sufficient to at least partially soften the polymerize the polymer bond precursor particles to form the polymer bond particles.

13. The method of claim 12 , wherein the liquid binder precursor material comprises a liquid carrier having a polymer dissolved or dispersed therein.

14. The method of claim 12 , further comprising heating the loose powder particles prior to step (a)(ii).

15. A method of making an abrasive article, comprising:
a) a subprocess, comprising:
i) depositing a layer of loose powder particles in a confined region, wherein the loose powder particles comprise polymer bond precursor particles and abrasive particles, and wherein the layer of loose powder particles has substantially uniform thickness;
ii) heating the loose powder particles and applying a liquid binder precursor material in predetermined regions of the heated layer of loose powder particles; and
iii) converting the liquid binder precursor material into a temporary binder material, wherein the temporary binder material bonds to at least a portion of the polymer bond precursor particles and the abrasive particles in the predetermined regions to form a layer of bonded powder particles;

b) independently carrying out step a) a plurality of times to generate an abrasive article preform comprising the bonded powder particles and remaining loose powder particles, wherein in each step a), the loose powder particles are independently selected and the liquid binder precursor material is independently selected; and
c) converting the polymer bond precursor particles in the abrasive article preform into polymer bond particles, wherein the polymer bond particles retain the abrasive particles to form a polymer bond abrasive article.

16. The method of claim 15 , wherein the liquid binder precursor material comprises a liquid carrier having a polymer dissolved or dispersed therein.

17. The method of claim 15 , wherein the converting step (c) comprises heating a selected portion of the abrasive article preform to a temperature sufficient to at least partially soften the polymerize the polymer bond precursor particles to form the polymer bond particles.

18. The method of claim 15 , wherein the abrasive article preform is heated to a temperature of about 150° C. to about 250° C.

Assignees

• 3M Innovative Properties Company

Inventors

• Smithson Robert L W
• Goers Brian D
• Shukla Brian A
• Harper Michael C

Classifications

• B24D3/20 Primary

  and being essentially organic · CPC title

• B24D5/10

  with cooling provisions, e.g. with radial slots · CPC title

• B24D18/0072 Primary

  using adhesives for bonding abrasive particles or grinding elements to a support, e.g. by gluing · CPC title

• B33Y10/00

  Processes of additive manufacturing · CPC title