Segmental type grinding wheel

• US 20030153257A1
• Filed: 02/10/2003
• Published: 08/14/2003
• Est. Priority Date: 02/12/2002
• Status: Active Grant

• Current Assignee: Noritake Company Limited (Noritake)
• Original Assignee: Noritake Company Limited (Noritake)
• Inventors: Kondo, Tomoharu, Nonogawa, Takeshi
• Granted Patent: US 6,846,233 B2
• Time in Patent Office: Days
• US Class Current: 451/542
• CPC Class Codes: B24D 5/06 with inserted abrasive blocks, e.g. segmental

Abstract

A grinding wheel of segmental type including an inner cylindrical core portion, and an outer grinding portion consisting of a plurality of segments which have abrasive layers formed of abrasive grains bonded together with a glass bonding agent and which are bonded to an outer circumferential surface of the core portion with a synthetic resin layer interposed therebetween, wherein a linear thermal expansion coefficient α_seg (° C.) of the segments and a linear thermal expansion coefficient α_cor (° C.) of the core portion satisfy a formula |(α_cor−α_seg)|≦6×10⁻⁶.

Claims

1. A grinding wheel of segmental type including an inner cylindrical core portion, and an outer grinding portion consisting of a plurality of segments which have abrasive layers formed of abrasive grains bonded together with a glass bonding agent and which are bonded to an outer circumferential surface of said core portion with a synthetic resin layer interposed therebetween, wherein an improvement comprises:

said plurality of segments having a linear thermal expansion coefficient α

_seg (/°

C.) while said core portion having a linear thermal expansion coefficient α

_cor (/°

C.), said linear thermal expansion coefficient α

_seg (/°

C.) and said linear thermal expansion coefficient α

_cor (/°

C.) satisfying a formula |(α

_cor−

α

_seg)|≦

6×

10<sup>−

6</sup>.

2. A grinding wheel of segmental type according to claim 1, wherein said linear thermal expansion coefficient α

_seg (/°

C.) and said linear thermal expansion coefficient α

_cor (/°

C.) satisfy a formula |(α

_cor−

α

_seg)|≦

5×

10<sup>−

6</sup>.

3. A grinding wheel of segmental type according to claim 1, wherein said synthetic resin layer is formed of an epoxy resin bonding agent cured in an atmosphere having a temperature not lower than 70°

C.

4. A grinding wheel of segmental type according to claim 1, which is operable at a peripheral speed of now lower than 4800 m/min.

5. A grinding wheel of segmental type according to claim 1, wherein said inner core portion is formed of a titanium alloy.