One of the important properties of abrasives is their hardness, which must be harder than the material to be processed. A Mohs hardness tester is commonly used to measure the hardness of various abrasives. Makino Spindle Maintenance pointed out that another important performance of abrasives is toughness or volume strength. This performance can be controlled by changing the mixing amount, purity, particle size, and crystal structure of the raw materials to be suitable for various applications.

 

The manufacturing of abrasive products requires crushing and screening of all raw materials, except for powdered talc and iron oxide. The screening particle size should be 4-900, with a diameter of approximately 6 millimeters (millimeters) to 6 micrometers (one thousandth of a millimeter) or finer. Grinding wheels are the most important abrasive products, which are mixed with abrasives and binders in a certain proportion, sintered after molding, and finally subjected to shaping, balancing, and overspeed tests. Sandcloth and sandpaper are another type of abrasive products with high production capacity, which are made by bonding abrasive particles onto the base material (cloth or paper), drying them and cutting them into products of different specifications. Other types of abrasive materials are powdery or granular, and after screening, they need to undergo certain process treatments, such as grinding or polishing abrasives, usually supplemented with mineral oil ointments or waxes to meet the needs of different working conditions.

 

The type of polishing abrasive - Mazak Spindle Maintenance Company will explain to you:

 

1. Diamond

 

Extremely high hardness, sharp and sharp particle shape, excellent grinding effect for materials with different hardness, and good polishing effect for alloy samples with different phases with significant differences in hardness and softness. In addition, diamond polishing abrasives have a long grinding life and high cutting ability, resulting in less abrasive consumption. At the same time, they can also ensure that the surface of the sample does not produce deformation disturbance layers.

 

2. Aluminum oxide

 

The hardness is very high and generally does not undergo chemical reactions with the polished material. Aluminum oxide polishing abrasive is a commonly used polishing abrasive for general steel specimens (on-site grinding of spindle cone holes). But it is not suitable for polishing aluminum and aluminum alloys, as aluminum oxide abrasives can easily make the aluminum surface dull and produce corrosion pits.

 

3. Chromium oxide

 

The polishing ability is weaker than that of aluminum oxide and can be used for the final polishing of steel specimens.

 

5. Iron oxide

 

An auroral bright surface can be obtained, but at the same time, it is prone to deformation and disturbance layers, and non-metallic inclusions will be pulled out of the metal matrix of the sample, which is rarely used.

 

6. Magnesium oxide

 

Low hardness, extremely fine particles, with a sharp shape and good grinding edge. It is more suitable for the final polishing of aluminum, magnesium, and other non-ferrous metal and alloy specimens. It has a small drag effect on non-metallic inclusions in steel samples, making it particularly suitable for inclusion inspection and polishing of cast iron graphite samples.