Grinding wheel for deep grinding

• US 5,063,714 A
• Filed: 04/04/1989
• Issued: 11/12/1991
• Est. Priority Date: 04/07/1988
• Status: Expired due to Fees

• Current Assignee: Firma Ernst Winter & SOHN Osterstrasse
• Original Assignee: Firma Ernst Winter & SOHN
• Inventors: Meyer, Hans-Robert
• Primary Examiner(s): RACHUBA, MAURINA T
• Application Number:
  US07/334,288
• Time in Patent Office: 952 Days
• Field of Search: 51/165.83, 51/165.93, 51/206 R, 51/207, 51/209 R, 51/204, 51/293
• US Class Current: 451/541
• CPC Class Codes: B24D 7/14 Zonally-graded wheels; Composite wheels comprising different abrasives

Abstract

A grinding wheel for deep grinding comprises a main body, and a diamond coating on the main body, the diamond coating including a first coating part with fine grain diamonds and a second coating part with diamonds of greater size, the second coating being composed of a plurality of diamond grains which are arranged in one layer as considered in a direction parallel to a feeding direction of the diamond wheel and in a plurality of layers as considered in a direction perpendicular to the feeding direction, the diamond grains of the second coating part being arranged in direct contact with one another and held in a galvanically deposited binder.

Claims

1. A rotatable grinding wheel having a center axis of rotation and a front face for engaging a workpiece when the grinding wheel is moved in a feeding direction relative to the workpiece during a deep grinding operation, comprising a first diamond coating secured to said front face and including a plurality of fine grain diamonds;

a second diamond coating secured to a free end face of said first diamond coating and including a plurality of diamonds of a relatively large size, said second diamond coating being arranged forwardly of said first diamond coating in the feeding direction, said large size diamonds being arranged in a single layer in the feeding direction in direct contact with one another and held in a galvanically deposited binder; and

a powder-metallurgy produced intermediate layer which is arranged between said coatings, said second coating being arranged on said intermediate layer.

2. A grinding wheel as defined in claim 1, wherein the grinding wheel is a peripheral grinding wheel.

3. A grinding wheel as defined in claim 1, wherein the grinding wheel is a cup-shaped grinding wheel.

4. A grinding wheel as defined in claim 1, wherein said diamond grains of said second coating part have a grain size of between 150 and 400 micrometers.

5. A grinding wheel as defined in claim 1, wherein said intermediate layer is composed of sintered iron.

6. A grinding wheel as defined in claim 1, wherein said first coating has a binder composed of a predetermined metal and holding said fine grained diamonds, said intermediate layer being composed of the same metal as said binder of said first coating.

7. A grinding wheel as defined in claim 1, wherein said intermediate layer is composed of nickel.

8. A grinding wheel as defined in claim 1, wherein said intermediate layer has a thickness of between 0.1 and 0.3 mm.

9. A grinding wheel as defined in claim 1, wherein said large size diamonds in said single layer form patterns which are concentric with respect to said center axis.

10. A grinding wheel as defined in claim 9, wherein said fine grain diamonds of the first coating are held in a binder which differs from said galvanically deposited binder of the second coating.

11. A grinding wheel as defined in claim 10, wherein a binder of said first coating is formed of a material providing an adherence to said binder of said second coating.