Grinding of AISI 4340 steel with interrupted cutting by aluminum oxide grinding wheel

Abstract

There has been a great advance in the grinding process by the development of dressing, lubri-refrigeration and other methods. Nevertheless, all of these advances were gained only for continuous cutting; in other words, the ground workpiece profile remains unchanged. Hence, it becomes necessary to study grinding process using intermittent cutting (grooved workpiece – discontinuous cutting), as little or no knowledge and studies have been developed for this purpose, since there is nothing found in formal literature, except for grooved grinding wheels. During the grinding process, heat generated in the cutting zone is extremely high. Therefore, plenty of cutting fluids are essential to cool not only the workpiece but also the grinding wheel, improving the grinding process. In this paper, grinding trials were performed using a conventional aluminum oxide grinding wheel, testing samples made of AISI 4340 steel quenched and tempered with 2, 6, and 12 grooves. The cylindrical plunge grinding was performed by rotating the workpiece on the grinding wheel. This plunge movement was made at three different speeds. From the obtained results, it can be observed that roughness tended to increase for testing sample with the same number of grooves, as rotation speed increased. Roundness error also tended to increase as the speed rotation process got higher for testing the sample with the same number of grooves. Grinding wheel wear enhanced as rotation speed and number of grooves increased. Power consumed by the grinding machine was inversely proportional to the number of grooves. Subsuperficial microhardness had no significant change. Micrographs reveal an optimal machining operation as there was no significant damage on the machined surface.

Multi-Criteria Decision-Making when Surface Grinding 9XC Steel with a Segmented Grinding Wheel

“…Applying the formula (4) to determine the asymptotic index. Applying the formula (5) to determine the overall neighborhood value. Ranking the solutions based on the di values.…”

“…Deterimine the value of dressing parameters when grinding 90CrSi steel to simultaneously ensure the minimum surface roughness, the minimum cutting force and the maximum grinding wheel durability [2], and to simultaneously ensure the minimum surface roughness and the minimum flatness tolerance [3]. Determine the optimal value of grinding wheel diameter when replacing to ensure the minimum cost for grinding process [4]; survey on surface roughness, grinding wheel durability and cutting power when cylindrically grinding AISI 4340 steel in case of discontinuous billet surface (with slits on the circumference of billet) [5]; study to improve the use of minimal quantity of lubricant (MQL) technology by adding water to the MQL and using cold air to spray into the cutting zone when grinding AISI 4340 steel [6]; determine the optimal value of wheel grit size, work speed, tagle feed, depth of cut, dressing feed, depth of dressing and cooling flow to ensure the minimum surface roughness when grinding AISI 4340 steel [7], etc.…”

Evaluation of surface grinding of AISI 304 stainless steel using dry and compressed air cooling techniques

“…The depth of cuts that were tested in this research were 0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm and 3.0 mm. The decision to adopt these depths of cuts was based on the analysis of the study by Matsui [22], Mekala et al [23] and Mello et al [24]. Type of grinding wheel used to grind these workpiece materials were silicon carbide.…”

Research on selection of abrasive grain size and cutting parameters when grinding of interrupted surface using aluminum oxide grinding wheel with ceramic binder

“…The research of external cylindrical plunge grinding on interrupted surface of AISI 4340 steel has been carried out in a number of studies, using different types of grinding wheels, such as using aluminum oxide grinding wheel with pine resin binder [6], using aluminum oxide grinding wheel with epoxy resin binder [7], using aluminum oxide grinding wheel with vitrified binder [8], and using CBN grinding wheel [9]. The results of these studies together have made the following Engineering conclusions: (1) both surface roughness and roundness error in interrupted surface grinding are higher than those in continuous surface grinding; (2) when increasing plunge-feed rate, both surface roughness and roundness error increase; (3) both surface roughness and roundness error increase when the number of grooves in the workpiece increases; (4) grinding wheel wear also increases when increasing plunge-feed rate and when increasing number of grooves on the grinding wheel; (5) and no damage to the grinding surface due to the impact of cutting heat was observed.…”