Dilip Kumar Singh

Vitrified Bond Grinding Wheels


The purpose of the bonding material is to embrace the abrasive grain particles together. Vitrified bond grinding wheels have a glass bond composition. Vitrified wheels hold form enormously well and produce a high ratio of stock removal to wheel use. Vitrified wheels are normally used for precision grinding in the tool and die market. All vitrified bonds that end in P indicate induced porosity. This porosity allows for excellent coolant flow and chip clearance. For materials that load for wide surface area contact. This delivers a cooler cutting action, less loading and less chance of burn on the work-piece.

The functionality of Vitrified bond grinding wheel

The abrasive grains are held together in a grinding wheel by a bonding material. The bonding material does not cut during the grinding operation. Its main function is to hold the grains together with varying degrees of strength. The Standard grinding wheel bonds are vitrified, Resinoid, silicate, shellac, rubber and metal.

The abrasive products are used in the precision grinding of ferrous and non-ferrous' materials.

Bonded abrasives are natural or synthetic abrasive grains "bonded" into a solid form, typically in the shape of a wheel. Bonded abrasives products similarly contain grinding and cut-off wheels

Special features of Vitrified bond grinding wheel

Vitrified bonded has added a higher level of performance to grinding operations.

The wear-free bond fully utilizes the high thermal and chemical stability in the grinding process. Unconventional dressing techniques, tools, and machine concepts have now shaped a grinding system that provides economic and efficient solutions when it comes to the mass production of steel components.

Vitrified bonded grinding wheels supply the best results for machining high-precision components made of non-ferrous materials.

For high-performance precision machines, vitrified bonds can be specifically designed to permit the full utilization of super abrasives.

Process of Vitrified bond grinding wheel

Vitrified wheels are made by bonding clay melted to a glass-like consistency with abrasive grains.

The clay and abrasive grains are thoroughly mixed with sufficient water to make a uniform mixture.

The fluid mixture is then poured into the mold and allowed to dry.

After cooling, the material trimmed to the more perfect size and shape.

It is then heated in a furnace to a temperature of 1260 degrees.

When the burning proceeds, the clay vitrifies that is it fumes and forms porcelain or glass-like substance that surrounds and connects the abrasive grains.

It gives upright strength and porosity to allow high stock removal

It is affected by cool water, heat or acids

Denoted by “V”

The main advantages to Vitrified Bond grinding process

Vitrified bond also known as ceramic bond are open structured grinding wheels, giving cool cutting, with long life

• They are Readily dressed able with conventional diamond dressers

• High stock removable

• Good finish

• Cool cutting

• They have a Long life

Conclusion

Vitrified bond grinding wheels is suitable for high stock removal even at the dry condition. It could also be safely used in wet grinding. It cannot be used where mechanical impact or thermal variations are likely to happen. This bond is not recommended for very high-speed grinding because of possible breakage of the bond under centrifugal force.

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