Methods of making metal bond abrasive articles and metal bond abrasive articles

Patent metadata

Field	Value
Publication number	US-10888973-B2
Application number	US-201615573254-A
Country	US
Kind code	B2
Filing date	Jun 16, 2016
Priority date	Jun 25, 2015
Publication date	Jan 12, 2021
Grant date	Jan 12, 2021

Abstract

Methods of making metal bond abrasive articles via powder bed jetting are disclosed. Metal bond abrasive articles prepared by the method include abrasive articles having arcuate or tortuous cooling channels, abrasive segments, abrasive wheels, and rotary dental tools.

First claim

What is claimed is:

1. A method of making a metal bond abrasive article, the method comprising the sequential steps:
a) a subprocess comprising sequentially:
i) depositing a layer of loose powder particles in a confined region, wherein the loose powder particles comprise higher melting metal particles and abrasive particles, and wherein the layer of loose powder particles has substantially uniform thickness;
ii) jetting a liquid binder precursor material onto at least one predetermined region of the layer of loose powder particles;
iii) converting the liquid binder precursor material into a binder material that bonds together the loose powder particles in the at least one predetermined region 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 the abrasive article preform has a predetermined shape, and wherein in each step a), the loose powder particles are independently selected, and the liquid binder precursor material is independently selected;
c) separating substantially all of the remaining loose powder particles from the abrasive article preform;
d) infusing the abrasive article preform with a molten lower melting metal, wherein at least some of the higher melting metal particles do not completely melt when contacted by the molten lower melting metal; and
e) solidifying the molten lower melting metal to provide the metal bond abrasive article.

2. The method of claim 1 , wherein the loose powder particles further comprise fluxing agent particles.

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

4. The method of claim 1 , wherein the abrasive particles comprise metal oxide ceramic particles.

5. The method of claim 1 , wherein the metal bond abrasive article includes at least one cooling channel.

6. The method of claim 1 , wherein the metal bond abrasive article is selected from the group consisting of an abrasive pad, an abrasive grinding bit, abrasive segments, and an abrasive wheel.

7. The method of claim 1 , wherein the metal bond abrasive article comprises at least a portion of a rotary dental tool.

8. The method of claim 1 , wherein the liquid binder precursor material comprises a liquid vehicle having a polymer dissolved therein.

9. The method of claim 8 , wherein the liquid vehicle predominantly comprises water.

10. The method of claim 1 , wherein the higher melting metal particles have a melting point that is at least 50 degrees Celsius higher than the temperature of the molten lower melting metal.

11. The method of claim 1 , further comprising, between steps c) and d), burning off at least a portion of the binder material.

12. A method of making a metal bond abrasive article, the method comprising sequential steps:
a) a subprocess comprising sequentially:
i) depositing a layer of loose powder particles in a confined region, wherein the loose powder particles comprise metal particles and abrasive particles, and wherein the layer of loose powder particles has substantially uniform thickness;
ii) jetting a liquid binder precursor material onto at least one predetermined region of the layer of loose powder particles;
iii) converting the liquid binder precursor material into a binder material that bonds together the loose powder particles in the at least one predetermined region to form 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 the abrasive article preform has a predetermined shape, and wherein in each step a), the loose powder particles are independently selected, and the liquid binder precursor material is independently selected;
c) separating substantially all of the remaining loose powder particles from the abrasive article preform; and
d) heating the abrasive article preform to provide the metal bond abrasive article.

13. The method of claim 12 , wherein the loose powder particles further comprise fluxing agent particles.

14. The method of claim 12 , wherein the abrasive particles comprise at least one of diamond particles or cubic boron nitride particles.

15. The method of claim 12 , wherein the abrasive particles comprise metal oxide ceramic particles.

16. The method of claim 12 , wherein the metal particles comprise a combination of higher melting metal particles and lower melting metal particles, wherein the higher melting metal particles have a melting point that is at least 50 degrees Celsius higher than the temperature of the molten lower temperature metal.

17. The method of claim 12 , wherein the metal bond abrasive article includes at least one cooling channel.

18. The method of claim 12 , wherein the metal bond abrasive article is selected from the group consisting of an abrasive pad, an abrasive grinding bit, abrasive segments, and an abrasive wheel.

19. The method of claim 12 , wherein the metal bond abrasive article comprises at least a portion of a rotary dental tool.

20. The method of claim 12 , wherein the liquid binder precursor material comprises a liquid vehicle having a polymer dissolved therein.

21. The method of claim 20 , wherein the liquid vehicle predominantly comprises water.

Assignees

• 3M Innovative Properties Co

Inventors

• Franke Carsten
• Goers Brian D
• Smithson Robert L W
• Adefris Negus B
• Shukla Brian A
• Harper Michael C
• Plotnikov Elizaveta Y

Classifications

• B33Y40/20

  Post-treatment, e.g. curing, coating or polishing · CPC title

• Y02P10/25

  Process efficiency · CPC title

• C22C33/0285

  with Cr, Co, or Ni having a minimum content higher than 5% · CPC title

• C22C33/0228

  comprising other non-metallic compounds or more than 5% of graphite · CPC title

• C22C26/00

  Alloys containing diamond {or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes} · CPC title