1. Nature of the bond for bonded abrasives
he role of bond is to hold individual abrasives together. Major types of bonds are as follows :
- (V) Glass, Porcelain
- (B) Synthetic resin, Epoxy resin
- (R) Synthetic rubber, Natural rubber
Features and nature of the bond
- The raw materials of bonds are clay, feldspar, and glass.
- Fired at a temperature about 1200℃.
- Strong abrasives holding strength and high rigidity.
- Applicable to a wide variety of work materials such as carbon steels and alloy steels.
- Very suitable for precision grinding.
- The raw materials of bonds are synthetic resin like phenolic resin.
- Cured at a temperature about 200℃.
- Due to its elasticity, resin bonded products provide soft cutting action in precision grinding, such as disc grinding, centerless grinding, and roll grinding.
- Due to its strength and impact resistance, resin bonded products are used for rough grinding applications, such as high pressure grinding, cut-off, and deburring.
- It’s made with rubber as a bond, and the rubber wheel is used as the regulating wheels for centerless grinding.
- Due to its property of epoxy bond, epoxy bond products are suitable for grinding unhardened steels on double spindle disc grinder and provide high metal removal rate without burns.
2. Bond types for superabrasives
Bond types are selected by grinding methods, workpiece materials, and truing methods.
|V||Vitrified||Mainly composed of glass with pores. Vitrified bond wheels are suitable for various applications – precision grinding to high efficiency grinding.|
|B||Resinoid||Mainly composed of phenolic resin. |
Resin bond wheels are easy to use due to its self-sharpening.
Resin bond wheels are suitable for various applications – rough grinding to finish grinding.
|M||Metal||Mainly composed of bronze type metal and the most strong bond compared with vitrified bond and resinoid bond. Metal bond wheels are suitable for precision grinding of hard and brittle materials, such as glass and ceramics, and realize high metal removal rate with high accuracy, and also suitable for rough grinding such as cutting off and deburring.|
|EP||Electroplated||Mainly composed of Nickel. Superabrasives are electroplated on the steel core. Due to large protrusion height of abrasives, electroplated wheels are suitable for rough grinding, and form grinding.|
|MKSL||Metal single layer||Only one layer of abrasives with controlled density is brazed on a steel core with metal bonds. Abrasive density can be controlled. Due to larger protrusion height of abrasives and more open face than electroplated, single layered metal brazed wheels bring excellent performances in grinding soft materials without loading.|