Resin bonded grinding wheels with fillers

• US 4,657,563 A
• Filed: 10/31/1985
• Issued: 04/14/1987
• Est. Priority Date: 10/31/1985
• Status: Expired due to Term

• Current Assignee: Norton Company Worcester MA
• Original Assignee: Norton Company (Compagnie De Saint-Gobain)
• Inventors: Licht, Robert H., Holden, Robert L.
• Primary Examiner(s): Lieberman, Paul
• Assistant Examiner(s): Thompson, Willie J.
• Application Number:
  US06/793,440
• Time in Patent Office: 530 Days
• Field of Search: 51/298, 51/308, 51/309, 51/307
• US Class Current: 51/308
• CPC Class Codes: B24D 3/344 the bonding agent being organic

Abstract

An improved resin bonded grinding wheel composition is shown making use of a kyanite or sillimanite or andalusite filler or mixtures thereof. More particularly the grinding wheel is a hot pressed phenol formaldehyde wheel having an alumina-zirconia abrasive with a kyanite additive therein. These wheels can be used for heavy duty metal grinding and have been determined to be especially useful for the snag grinding of titanium metal.

Claims

1. A resin bonded grinding wheel containing an abrasive grain adapted for grinding metal, said wheel containing grinding aid means including a grinding aid which is a particulate alumino-silicate selected from the group consisting of sillimanite, mullite, kyanite, andalusite, and mixtures thereof.

2. A wheel as in claim 1 wherein the wheel is a hot pressed billet grinding wheel.

3. A wheel as in claim 2 wherein said grinding aid means also includes cryolite.

4. A wheel as in claim 3 wherein said grinding aid means also includes lime.

5. A wheel as in claim 1 wherein said grinding aid means also includes an alkali metal halide or mixtures thereof.

6. A wheel as in claim 2 wherein said wheel includes about 57% by volume of abrasive grits, about 22% by volume phenol formaldehyde resin bond, about 6.1% cryolite by volume, about 1.2% polyvinylidene chloride by volume, about 3.1% CaO by volume, about 6.1% kyanite by volume, and the remainder being chopped fiberglass filler.

7. A grinding wheel as in claim 2 wherein said wheel includes about 57% alumina-zirconia abrasive grits sized 12 to 14 mesh by volume, about 22% phenol formaldehyde resin by volume, about 1.2% polyvinylidene chloride by volume, about 3.1% CaO by volume, from 6.1% to 12.3% by volume of kyanite sized less than 200 mesh, and the remainder being chopped fiberglass filler.

8. A grinding wheel as in claim 7 wherein said grinding aid means includes powdered cryolite present in an amount of about 6.1% by volume.

9. A grinding wheel as in claim 7 wheein said grinding aid means includes sodium chloride present in an amount of about 6.1% by volume.