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A grindstone7/30/2023 ![]() Grindstone-based abrasive working produces grinding debris after a workpiece is shaved down.Grinding debris continuing to remain between the grindstone and the workpiece diminishes the abrasive power of the grindstone, and makes both it and the workpiece grow hot.This heat invites grinding burns and deformation, proving to be a factor causing damage to the grindstone.What’s more, grinding debris can turn into large chips that come into contact with the workpiece, proving to be a factor causing scratches during finishing. In the interstices between grains retained by the bond, there are any number of microfine gaps called pores.These pores are not mere holes, but have an indispensable, crucial role. In terms of adjusting the force with which the grindstone is pressed on the work, the rigidity of the bond has a significant impact.If the bond is high-rigidity, the pressing force of the grains intensified, making the grindstone fit for rough cutting in grinding operations.Conversely, bond having elasticity has cushioning properties, and thereby the pressing of the grains can be adjusted to be soft-meaning, therefore, that the bond is suitable for abrasive working whose objective is to alter the surface condition.Īlso, the elasticity in a bond enables leveling out the tips of grains whose extent of protrusion is irregular.Uniform abrasive power thereby can be imparted to the contact surface of the grindstone, enabling smoother finishing. If the bonding force between the bond and the grains is too strong, grains that have lost their shaving power will continue to remain in the surface.Continued rubbing by grains lacking cutting power overheats the grindstone and the workpiece, giving rise to processing failures such as damage to the grindstone, grinding burn, and deformation.Ĭonversely, if the bonding force is low, grindstone wear is rapid, which is inefficient in terms of tool life.Thus, retaining force that is not suited to a given role of retaining grains ties in with degradation of the finish, and of tool life. If grains when having lost their shaving power do not fall out at just the right time, the work cannot be kept ongoing. Mechanism to Grindstone-Based Finishingīonds possess the dual roles of retaining the grains and of adjusting the force with which the grindstone as a whole presses against the workpiece. ![]() Grindstones can be formed into customized shapes, meaning that they can be installed and used on dedicated machines, which ties in to finishing job standardization.Utilizing grindstones in this way also makes high-efficiency continuous machining possible. With conventional lapping operations employing grit, considerable time and trouble are required for pre- and post-operation preparations, and for post-processing.īeing able to replacing this sort of grit-based finishing with grindstone-based abrasive machining makes it possible to omit the pre- and post-process steps.Reducing the number of steps allows processing time and cost to be drastically reduced, and can serve to curtail lead time. ![]() Thanks to grindstone research and advances, however, grindstones that enable uniform, high-precision abrasive working are also becoming more widespread. Thus, abrasive working and grinding operations differ in terms of whether the objective is to “smooth” or to “shave down.” Understanding Grindstones Used in FinishingĪbrasive working methods include those that employ grit and those that employ grindstones.Among them, methods employing grindstones are in general pervasively perceived as being used in grinding operations pervades, while abrasive machining tends to be thought of as based on grit.This may be a perception that spread at a time when grindstones could only be used for rough shaving. finishing, it.Ībrasive working is carried out to minimize irregularities in and smooth the surface of a workpiece.Abrasive working does not result in significant change in form the fact that it actually scrapes away the surface of the workpiece to change its microscopic form makes it is one class of removal process.Īmong removal processes, in addition to abrasive working is grinding.The two are sometimes confused, but their objectives are different.Ībrasive working is a process that focuses on smoothing.Given that the objective is to alter the surface condition, there is no significant altering of form.On the other hand, grinding operations are processes in which the focus is placed on shaving down the surface.The processes are characterized by the fact that because the amount that is shaved off is considerable, in many cases they are accompanied by a visible change in form. The word “finish” means, to “give a desired or particular surface texture,” from Old French finir, “to complete.”Abrasive working is the process of changing the surface condition of a workpiece by honing and polishing, i.e.
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