Abrasive structures having a compression-producing reinforcing ring

Claim 2

A high-speed rotative abrasive article reinforced against destructive disintegration at advanced rotative velocities comprising: a. an annular disc formed of abrasive grains held by a binder and having a central axial aperture; b. a curable adhesive means; and c. an in-tension ring which is inserted into said central aperture and held in the peripheral surface of said aperture by adhesive means, with maintenance of said ring in its in-tension state until the adhesive means is fully cured.

Claim 3

The high-speed rotative abrasive article of claim 1 wherein the in-tension ring is coated on at least one surface thereof with the adhesive means prior to being put in tension.

Claim 4

The high-speed rotative abrasive article of claim 1 wherein the in-tension ring is coated on at least one surface thereof with the adhesive means prior to being inserted into said central aperture.

Claim 5

The high-speed rotative abrasive article of claim 1 wherein the peripheral surface of said central aperture is coated with the adhesive means prior to the insertion of said in-tension ring into said aperture.

Claim 6

The high-speed rotative abrasive article of claim 1 wherein both at least one surface of the in-tension ring and the peripheral surface of said central aperture are coated with the adhesive means prior to the insertion of said in-tension ring into said aperture.

Claim 7

The high-speed rotative abrasive article of claim 1 wherein element (c) comprises a ring which is inserted into said central aperture and held on the peripheral surface of said aperture by the adhesive means, said ring immediately upon insertion being tensioned and maintained in a tensioned state until the adhesive means is fully cured.

Claim 8

In a rotatable annular centrally apertured abrasive article formed of abrasive grains held by a binder including a ring-shaped reinforcing means around the central axis of rotation of said article concentric to said axis as well as being attached to the periphery defining the central aperture of said article, the improvement therewith which comprises expansion of said reinforcing means as of the insertion thereof into the central aperture, with maintenance of said expansion at least until the full attachment thereof to said abrasive article.

Claim 9

In a rotatable annular centrally apertured abrasive article formed of abrasive grains held by a binder including a ring-shaped reinforcing means around the central axis of rotation of said article concentric to said axis as well as being attached to the periphery defining the central aperture of said article, the improvement therewith which comprises expansion of said reinforcing means as of the insertion thereof into the central aperture, with maintenance of said expansion at least until the full attachment thereof to said abrasive article.

Claim 10

A high-speed rotative abrasive article reinforced against destructive disintegration at advanced rotative velocities comprising: a. an in-tension ring; and b. an annular disc formed of abrasive grains held by a curable binder which is molded around and in contact with the outer periphery of said ring, with maintenance of said ring in-tension until the binder is fully cured by the application of heat thereby providing proper retention of the abrasive grains and full attachment of said ring to the inner periphery of said disc.

Claim 11

A high-speed rotative abrasive article reinforced against destructive disintegration at advanced rotative velocities comprising: a. an in-tension ring; and b. an annular disc formed of abrasive grains held by a curable binder which is molded around and in contact with the outer periphery of said ring, with maintenance of said ring in-tension until the binder is fully cured by the application of heat thereby providing proper retention of the abrasive grains and full attachment of said ring to the inner periphery of said disc.

Claim 12

In the manufacture of a high-speed rotative centrally apertured grinding wheel formed of abrasive grains held together by a binder including a reinforcing ring attached to the periphery defining the central aperture of said grinding wheel, combining the method steps of: a. providing a curable adhesive means on at least one surface of the interface located between the outer periphery of said ring and the periphery defining the central aperture of said grinding wheel; b. tensioning said ring and maintaining said tension with an expanding means; c. inserting said ring into said central aperture; d. fully curing said adhesive means; and e. removing said expanding means to reduce the tension in said ring, thereby putting a compressive force on the peripheral surface of the grinding wheel central aperture.

Claim 13

In the manufacture of a high-speed rotative centrally apertured grinding wheel formed of abrasive grains held together by a binder including a reinforcing ring attached to the periphery defining the central aperture of said grinding wheel, combining the method steps of: a. providing a curable adhesive means on at least one surface of the interface located between the outer periphery of said ring and the periphery defining the central aperture of said grinding wheel; b. tensioning said ring and maintaining said tension with an expanding means; c. inserting said ring into said central aperture; d. fully curing said adhesive means; and e. removing said expanding means to reduce the tension in said ring, thereby putting a compressive force on the peripheral surface of the grinding wheel central aperture.

Claim 14

The process of claim 9 wherein step (a) providing a curable adhesive means on at least one surface of the interface located between the outer periphery of said ring and the periphery defining the central aperture of said grinding wheel, is performed after step (b) tensioning said ring and maintaining said tension with an expanding means.

Claim 15

The process of claim 9 wherein step (b) tensioning said ring and maintaining said tension with an expanding means, is performed after step (c) inserting said ring into said central aperture.

Claim 16

In the manufacture of a high-speed annular rotative centrally apertured grinding wheel formed of abrasive grains held together by a curable binder including a reinforcing ring attached to the periphery defining the central aperture of said grinding wheel, comprising the method steps of: a. tensioning said ring and maintaining said tension with an expanding means; b. molding the grinding wheel, formed of abrasive grains held by the curable binder, around and in abutting contact with the outer periphery of said in-tension ring; c. heating said molded grinding wheel in-tension ring assembly until the binder is fully cured thereby providing both proper retentioN of the abrasive grains and complete attachment of said in-tension ring to the inner periphery of said grinding wheel central aperture; and d. removing said expanding means to reduce the tension in said ring, thereby inducing a compressive force on the peripheral surface of said grinding wheel central aperture.

Claim 17

In the manufacture of a high-speed annular rotative centrally apertured grinding wheel formed of abrasive grains held together by a curable binder including a reinforcing ring attached to the periphery defining the central aperture of said grinding wheel, comprising the method steps of: a. tensioning said ring and maintaining said tension with an expanding means; b. molding the grinding wheel, formed of abrasive grains held by the curable binder, around and in abutting contact with the outer periphery of said in-tension ring; c. heating said molded grinding wheel in-tension ring assembly until the binder is fully cured thereby providing both proper retentioN of the abrasive grains and complete attachment of said in-tension ring to the inner periphery of said grinding wheel central aperture; and d. removing said expanding means to reduce the tension in said ring, thereby inducing a compressive force on the peripheral surface of said grinding wheel central aperture.

Claim 18

In the manufacture of a high-speed rotative centrally apertured grinding wheel including a reinforcing ring having its outer periphery attached to the periphery defining the central aperture of said grinding wheel, combining the method steps of: a. providing a curable adhesive means on at least one surface of the interface located between the outer periphery of said ring and the periphery defining the central aperture of said grinding wheel; and b. expanding said reinforcing ring as of the insertion thereof into the central aperture, with maintenance of said expansion at least until the full attachment of said reinforcing ring to said grinding wheel, wherein subsequent termination of said expansion induces a compressive stress on the peripheral surface of said grinding wheel central aperture.

Claim 19

In the manufacture of a high-speed rotative centrally apertured grinding wheel including a reinforcing ring having its outer periphery attached to the periphery defining the central aperture of said grinding wheel, combining the method steps of: a. providing a curable adhesive means on at least one surface of the interface located between the outer periphery of said ring and the periphery defining the central aperture of said grinding wheel; and b. expanding said reinforcing ring as of the insertion thereof into the central aperture, with maintenance of said expansion at least until the full attachment of said reinforcing ring to said grinding wheel, wherein subsequent termination of said expansion induces a compressive stress on the peripheral surface of said grinding wheel central aperture.