Types of grinding wheels and performance characteristics of ...

Grinding wheel is the main tool for grinding. It is a porous object composed of abrasive and bonding agent. Among them, abrasive, bond and substitution are the three basic components of the grinding wheel. The characteristics of the grinding wheel may vary greatly through the difference in abrasives, bonding agents, and grinding wheel manufacturing processes, which have an important impact on the accuracy, size and production efficiency of the grinding process. Therefore, the appropriate grinding wheel must be selected according to specific conditions.

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Abrasive is the main raw material for making grinding wheels, it is responsible for cutting work. Therefore, the abrasive must be sharp, while having high hardness, good heat resistance and certain advantages. The name, code, characteristics and uses of commonly used abrasives.

Particle size refers to the size of abrasive particles. The particle size is divided into two groups: abrasive particles and micro powder. Abrasive grains are classified by the screening method, and its particle size number is expressed by the number of holes within one inch of the screen. For example, &#;60&#;#&#; grain size, means that it can pass through a screen with &#;60&#; holes per inch, but cannot pass through a screen with &#;70&#; holes per inch. Micropowder is classified by microscopic measurement, and its particle size number is expressed by the actual size of the abrasive (&#;W&#;).

The choice of abrasive particle size is mainly related to surface roughness and productivity.
In rough grinding, the grinding allowance is large and the required surface roughness value is larger, so coarser abrasive grains should be used. Because the abrasive grains are coarse and the pores are large, the grinding depth can be larger, and the grinding wheel is not easy to block and generate heat. In fine grinding, the margin is small and the roughness value is required to be low, so finer abrasive grains can be selected. Generally speaking, the finer the abrasive grains, the better the grinding surface roughness.

1. High bonding strength.

For example, the linear speed of the high-speed cutting wheel can reach 80-100m/s, and the grinding load of the heavy-duty grinding wheel is increased from about 50kg to more than kg.

2. Easy to adjust the structure and performance.

The hardening temperature of the resin abrasive is only about 185 °C, which is much lower than the firing temperature of the ceramic grinding tool at °C. Therefore, the mesh can be inserted into the mesh cloth, the wire, the graphite powder and the screw. Caps and other materials to meet the needs of different grinding. The performance of many fillers can be maintained after the abrasive is made, so the use of different fillers can change the performance of the abrasive in a large range.

3. It has elasticity, which is beneficial to improve the smoothness of the workpiece to be processed.

The use of graphite, chrome oxide and other polishing materials as fillers can further reduce the roughness.

4. It is not easy to burn the workpiece during processing.

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The resin is gradually carbonized at 230 °C. The high temperature during processing causes the resin to be partially carbonized, resulting in self-sharpening, which improves the sharpness of grinding and reduces the grinding temperature and avoids burning the workpiece.

5. Because the resin has good forming properties and good toughness, it can be made into a thin grinding wheel with a thickness of about 0.1mm for slotting cutting.

6. Short production time, simple equipment, and low investment efficiency.

7. Poor water resistance, poor alkali resistance and short shelf life, which are shortcomings, and should be paid attention to during production and use.

8. Widely used.( in the manufacture of cutting wheels, depressed-shaped grinding wheels, heavy-duty grinding wheels, roll polishing wheels, graphite mirror grinding wheels, conductive grinding wheels, honing wheels, soft polishing wheels, etc.)

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By Echo Zhou

04.04.

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