Why use vitrified bond for grinding wheels?

Grinding wheels are often referred to as "industrial teeth". It generally refers to a solid round object (mostly round with a through hole in the center) formed by bonding coarse abrasive compounds together, which can be used on the outer edge. Numerous hard, sharp, and temperature-resistant small abrasive grains continuously cut and remove the surface of various materials, so they have a pivotal position in industrial production.

In order to consolidate the hard abrasive particles into a certain shape, the existence of "binding agent" is essential. Its role is mainly reflected in the following two aspects:

1. Shape the abrasive into an abrasive tool

Abrasives, whether they are ordinary abrasives or super-hard abrasives, are barren materials and have no molding properties themselves. They can be molded by adding bonding agents, temporary bonding agents, wetting agents, etc., and then fired, the abrasives pass through the bonding agent. The bridges are connected to obtain an abrasive tool with a certain strength and hardness.

2. Make the grinding wheel capable of grinding

The hardness of the grinding wheel is also called the degree of bonding abroad, which refers to the holding strength of the bonding agent to the abrasive. The hardness of the grinding wheel is a very important performance index of the abrasive tool, which directly affects the various performances of the grinding wheel, such as the grinding ratio, Self-sharpening, shape retention, etc.

  Link：https://youtu.be/bVjKa6TLvPU

At present, the bonding agent materials used in abrasive tools can be divided into three types: resin, metal and vitrified, each of which has its own advantages. The comparison of their performance can be seen in the following table:

Species	Performance	Application
Resin bond	High strength, high elasticity, impact resistance, poor robustness and heat resistance, low porosity	Suitable for rough grinding process, burr, steel billet, cutting disc and some fine-grained fine grinding wheels
Metal bond	Good toughness and formability, high strength, but poor self-sharpening, short life	Various diamond and CBN abrasive tools can be manufactured
Vitrified bond	Heat resistance, good corrosion resistance, large porosity, easy to maintain contour, poor elasticity	It is widely used in various grinding methods such as outer circle, inner circle, flat surface, centerless, etc. It is the most commonly used bonding agent for abrasive tools.