article size selection is one of the key factors to determine the machining effect. Generally speaking, the selection of granularity should consider the following aspects.
(1) The workpiece processing allowance is large, requiring high grinding efficiency should choose coarse grain size, conversely, should choose fine grain size. Under normal circumstances, when processing similar parts, the grinding efficiency of the sanding belt is higher than that of the grinding wheel, because almost all the abrasive particles neatly arranged on the surface of the abrasive belt can play a grinding role, and the depth of the abrasive particles embedded on the workpiece surface is larger than that of the grinding wheel, so the workpiece surface roughness requirements are the same, and the abrasive particle size of the sanding belt should be one smaller than that of the grinding wheel. If the grinding wheel surface grinder uses 36#~46#, the sand belt uses 46#~60# particle size. If the cylindrical grinding wheel is used with 60#~80# particle size, the sand belt is used with 80#~100# particle size. Of course, the selection of particle size should also be combined with the rigidity and operating skills of the grinder.
(2) In the case of the same workpiece roughness requirements, fine grain size should be used for high linear speed, and less coarse grain size should be used for low linear speed. Such as the plywood surface sand light speed of 15~20m\s, grinding grain size of 36#~46#, and use broadband sander, sand belt line speed of 32m\s, abrasive particle size of 60#.
(3) When processing metal materials and non-metallic materials, if the surface quality requirements are similar, the metal workpiece is processed with fine particle size, and the non-metallic workpiece is processed with coarser particle size.
(4) When processing the same kind of workpiece, the coarse grain size is selected during dry grinding; Select fine particle size when grinding wet processing, if using lubricating oil as coolant, choose finer particle size.
(5) For large contact area of sanding belt grinding, coarser grain size should be selected; Small contact area with fine particle size. For example, the contact surface of plane grinding is generally larger than the contact surface of outer grinding, so when processing the workpiece of the same material, the particle size of the plane grinding belt should be slightly thicker than that of the outer grinding belt.
(6) Select the particle size according to the material of the workpiece. When processing the metal with greater toughness or soft performance, the sanding belt is easy to be blocked, so it is appropriate to choose coarser grain size; When processing steel with greater hardness, fine particle size can be selected.
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