Resin bond diamond grinding wheels for PCD drill bits

Resin bond wheels

Resin bond is usually made with heat-cured resinmainly composed of phenolic resin. Resin bond wheel has excellent grindingability, surface finish and minimal chipping. It is widely applied fordifficult-to-machine material such as tungsten carbide, ceramics, glass, andsilicon as well as ferrous materials such as high-speed and sintered ferrousmetals.

1 Characteristics of resin bond wheels

①Resin bond usually has some added fillersuch as organic materials, metals, etc. into the phenolic resin in order tocontrol its wear resistance, heat resistance, grit retention and lubrication.

②Resin wheel are low in young’s modulus; thereforethey have excellent characteristics in: processing efficiency, free cutting,surface finish, and minimal chipping.

③Resin bond wheels have shorter wheel lifebecause the adhesion between the grit and the bond is not as strong as that ofmetal bond wheels. However, resin bond has much better cutting ability whenprocessing hard-to-grind material such as cermets, ceramics, etc.

④The diamond and CBN abrasive used for resinbond wheels are different from those used for metal bond. They areirregular-shaped and easy to micro-fracture. By doing so, they also create newcutting edge constantly while grinding. In order to improved grit retention,the diamond is metal-coated and the surface is more uneven shaped.

⑤Resin wheel are typically used for wetgrinding, but they can be for dry grinding by adding some filler to reduce heatgenerated by grinding and improving their cutting ability.

2Applications ofdiamond wheels

①Resin bond diamond wheels are mostly usedfor precision grinding wheel of tungsten carbide, cermets and ceramics.

②Because of the bond elasticity, they areused for finish grinding of silicon, glass, ceramic-made electrical parts, etc.which require excellent surface finish.

3Application ofCBN wheels

①Resin bond wheels are suitable for grindingferrous metal such as cast iron, high speed steels, and sintered iron.

②They are suitable for processing hard tomachine materials because CBN grains are much stronger than conventional abrasives.

③They can perform precision grinding becausethey wear much less than conventional abrasives.