The specification and size of diamond abrasive tools are generally smaller than those of ordinary abrasive tools. The diameter is mostly between 50 and 300 mm. The maximum diameter in China reaches 100 mm. The width and depth of diamond are generally 2 to 10 mm. The thickness (width) of some flat grinding wheels reaches 20 to 30 mm or a little larger. This is already a so-called “High-Thickness” grinding wheel. The specific specification and size are determined according to the specifications of the workpiece to be processed, processing requirements and the specifications of the grinding machine.
The abrasive here refers to the brand and grade of abrasive. The national standard for diamond abrasives stipulates that it is represented by a series of brand and grade such as RVD, MBD, and SMD. The special abrasive for metal-bonded diamond abrasive tools is the MBD series variety; the RVD series variety is applicable to resin and ceramic-bonded diamond abrasive tools; the SMD series variety is applicable to sawing tools and drilling tools. Some sawing tools and drilling tools can also use the MBD series variety. Electroplated products need to use magnetically separated diamond abrasives.
Grain size refers to the grain size of abrasive, which is represented by the grain size number specified by the standard. The MBD grain size range applicable to metal-bonded diamond abrasive tools is 35/40 to 325/400, and the commonly used grain size is 80/100 to 230/270. Grain size directly affects processing efficiency, processing accuracy and surface roughness. Fine grain size is suitable for fine grinding and can obtain lower surface roughness and higher surface processing accuracy; coarse grain size is suitable for rough grinding and can use a larger grinding depth to obtain higher grinding efficiency. Under the premise of meeting the roughness requirements, coarse grain size should be selected as much as possible to improve efficiency. It should be pointed out that in order to achieve the same roughness, compared with ordinary abrasive tools, diamond abrasive tools should use a finer grain size, generally 2 to 3 grain size numbers finer.
The binder is an important symbol of the performance of abrasive tools. It functions to hold the abrasive and connect the substrate, and endows the abrasive with a certain geometric shape and performance. Diamond abrasive tools are mainly divided into four types according to the binder: resin – bonded binder, metal – bonded binder (specifically referring to sintered metal – bonded binder), electro – plated metal – bonded binder, and ceramic – bonded binder. The current national standards stipulate that they are represented by the codes B, M, Me, and V respectively. The original machinery – related standards used J, S, D, and A to represent metal – bonded, resin – bonded, electro – plated, and ceramic – bonded binders respectively, and Q was used to represent the bronze – bonded binder among metals.
Concentration is a concept specific to diamond abrasive tools and CBN (cubic boron nitride) abrasive tools. It is similar to the concept of abrasive-to-binder ratio of ordinary abrasive tools such as corundum and silicon carbide. The meaning of concentration is: the content (or volume occupied) of diamond or CBN abrasive per unit volume of the working layer. The commonly used concentration representation method at home and abroad is that when the volume occupied by the abrasive in the working layer is 25%, for diamond (with a density of 3.52 g/cm³), it is defined as 100% concentration.
Concentration is one of the main characteristic indicators of diamond abrasive tools. It has a great impact on the grinding effect. It is difficult to achieve the ideal effect whether the concentration is too high or too low. The general rule for selecting concentration is: as the concentration increases, the grinding ratio and durability of the abrasive tool increase accordingly; the higher the strength of the binder, the higher the optimal concentration range that can be selected. There are certain corresponding rules among concentration, abrasive particle size, processing steps, and surface roughness:
·Concentration: high → low
·Grain size: coarse → fine
·Process: rough grinding → fine grinding
·Roughness: high → low
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Henan Yuxing Carbon Material Co.Ltd. is professional manufacturer and supplier of micron and nano industrial diamond powder in the world.
Henan Yuxing Carbon Material Co.Ltd. is professional manufacturer and supplier of micron and nano industrial diamond powder in the world.
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