The Choice Of Abrasive Tools' Concentration

Concentration is a unique indicator of abrasives tools, which refers to the quality of abrasives tools contained in each cubic centimeter of the working layer of super hard abrasive. The international regulation unit volume contains 0.88G super hard abrasive, and its concentration is 100%. When the content increases or decreases by 0.22G, its concentration increases or decreases by 25% accordingly. Concentration is one of the important characteristics of abrasive tools, which has a significant impact on the grinding efficiency of the abrasive and the processing cost of the process. If the concentration is too high, many abrasives are easy to fall off prematurely, resulting in waste of abrasives; if the concentration is too low, the grinding efficiency decreases and cannot meet the processing requirements.

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The selection of the abrasive concentration mainly considers factors such as the type of binder, the particle size of the abrasive, the processing procedure and the shape of the abrasive.

Different types of binding agents have optimal concentration ranges due to their different binding capacities. The higher the strength of the binding agent is, the higher the optimal concentration range is.      

For the same bond, the concentration of cubic boron nitride abrasives is generally slightly higher than that of diamond abrasives. This is because cubic boron nitride is mainly used to process tough steel, and its hardness is lower than that of the workpiece material processed by the diamond factory. The particle size of the abrasive tool is relatively fine, and its concentration should be lower to meet the requirements of fine-grained abrasive tool for precision grinding and low roughness. For example, in polishing and high-precision grinding, low-concentration resin-bonded abrasives are often used, with individual concentrations as low as 25%. For the rough grinding process that requires high processing efficiency, the use of coarse-grained, high-concentration abrasives for grinding can better meet the processing efficiency and process requirements.

The choice of abrasive concentration should also take into account the shape and processing method of the abrasive. For the width of the working surface, especially for the form grinding method that requires maintaining the shape accuracy of the abrasive tool, and the groove grinding of end face grinding, the abrasive tool with a higher concentration should be selected.



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