#5 Basic Knowledge of Grinding Wheel Part.2

Posted by EMICorporation on June 17, 2021

Ⅱ. Manufacturing Process of Grinding Wheels

Three Factors of Grinding Wheels

There are many different kind of manufacturing methods depending on bonds. Our products are produced with resinoid bonds which is safe and used in many industries.

Bond Type	Code	Major Components	Firing Method / Temperature	Applications	Features
Vitrified	V	Feldspar / Soluble Clay	Continuous kiln / Bell kiln / Downdraft kiln 1200-1350°C (2192-2462°F)	Machining, Free-hand grinding, Super finishing, Honing, Pulpstone	Use feldspar and/or soluble clay as binder and bake at high temperature of 1300 degrees C after complete drying. The most common manufacturing method. Easy to adjust grade and structure.
Resinoid	B・BF *BF=Resinoid and Reinforced	Phenol resin, other artificial resins	Low temperature electric oven, around 200°C (392°F)	Rough grinding, Free-hand grinding, Cutting, Machining, Lapping	Use synthetic resin as binder and harden at low temperature of 200 degrees C. Springy and resistant to high speed rotation. There are wide variety of wheels according to purposes. *Our grinding wheels are resinoid bonded wheels which are produced by this method.
Silicate	S	Silicate soda (water glass)	Downdraft kiln 600-1000°C (1112-1832°F)	Sharpening, surface grinding	Use silicate soda as binder and harden at low temperature. Ideal for sharpening and polishing of wood saw. Silicate soda acts as lubrication. For soft grade wheels.
Magnesia	O	Magnesium oxychloride cement	Unfired wheel, harden at ordinary temperature.	Sharpening, surface grinding.	Use kind of cement as binder and harden at ordinary temperature. Reduce effect of grinding heat, ideal for surface grinding of thin materials. Provide good grinding performance with low speed.
Shellac	E	Shellac (natural resin)	Low temperature electric oven, around 170°C (338°F)	Tool grinding, Lapping	Use natural resin as binder and harden at low temperature after compression molding. Ideal for low speed lapping. For soft grade wheels

Manufacturing Method of Grinding Wheels

Manufacturing process of our main products “resinoid bonded wheel” are introduced below.

Raw materials

Use Abrasive grains, filling and bond.
Compounding ratio varies with each product.

What is filling?
Except abrasives and bond, grinding wheel contains many compounds as filling. There are many purposes of adding filling, such as performance increase or coloring (green, red or black etc.).