ULTRA PRECISION HARD TURNING AND GRINDING MACHINE Main characteristic of hard turning Turning up to 70 HRC Surface finish : 0.1 - 0.4 micron Dimensional accuracy : 2 micron Finish Hard Turning is the cost effective alternative to cylindrical grinding Cost saving : Hardened workpieces can be finished in one clamping.

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In principle, hard turning is possible on any precision turning machine. However, to develop the full potential of finish hard turning in terms of workpiece quality and process reliability, a lathe specifically designed for finish hard turning …

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While grinding is still the preferred method for certain workpieces and applications (such as very long and thin items, medical parts, or components requiring tolerances less than ±0.0002 inch), it's time to take another look at the potential savings and other benefits of hard turning. Hard turning typically refers to a lathe or turning ...

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1. INTRODUCTION The idea behind joint machining involves the integration of hard turning and grinding. Hard turning is characterized by efficient material removal and flexibility, while grinding can offer unsurpassed surface quality to the finished product. The concept lies in exploiting, on one hand, the high material removal ability and the ...

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Hard turning, on the other hand, has geometric limitations, which is the case for long and thin components. While hard turning is an option for finishing parts, it's not the preferred one. Precision grinding processes can achieve a 6 Ra surface finish, hold a size tolerance of fewer than 0.0002 inches, and grind parts to within 30 millionths ...

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Combining Hard Turning and Grinding. A combination machine that is capable of both turning and grinding work in a single setup might provide the capabilities a shop needs to address an ever changing work flow. The vertical …

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Compared with grinding, hard turning is competitive in many cases, with substantial benefits. However, hard turning applications are not preferred, due to …

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Hard turning, grinding, and honing are common finishing processes in today's production. The machined subsurface undergoes severe deformation and possible microstructure changes in a …

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The hard turning and grinding technology has proven its worth in the field. In the machining of chucked components (VSC DS Hard Turning and Grinding Machine) the combination of hard turning and grinding is state-of-the-art. There is, however, a considerable rationalisation potential still to be tapped, as by no means all the processes where it ...

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BACK: Reprint from the journal 10 - 2002. Hard turning and grinding of HSK tool holders. Author: Rudolf Beyer E-Mail: [email protected] The vertical pickup lathe V300 from Index is a recent acquisition of the grinding department of Bilz Werkzeugfabrik in Ostfildern, Germany. Upgraded to a turn-grind center with counter spindle, this lathe allows to hard-turn a …

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Hard Turning Versus Grinding. Lori Beckman. Senior Editor, Production Machining. Hard turning is often considered a replacement for grinding operations or as a pre-grinding process. It is most often performed on post-heat treated parts with surface hardness ranging from 45 HRC to 68 HRC or higher. Grinding, however, achieves higher tolerances ...

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Hard turning, on the other hand, has geometric limitations, which is the case for long and thin components. While hard turning is an option for finishing parts, it's not the preferred one. Precision grinding processes can achieve a 6 Ra surface finish, hold a size tolerance of less than 0.0002 inches, and grind parts to within 30 millionths ...

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Grinding is a more universally known process. Most workpieces can be ground, independent of their shape. Hard turning, on the other hand, has geometric limitations, as is the case with long and thin components. Wide surfaces can be finished effectively, often with a single plunge grind operation. In addition, with grinding a turn-free surface ...

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One of these is hard turning, as a cost efficient alternative to grinding. The technology is analyzed in the case of a bearing component, as a new process step versus the existing grinding process. Experimental tests were performed in order to describe the advantages of this technology. Cubic Boron Nitride grades (CBN) are used for cutting.

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Traditional machining of hard steels needs a sequence of processes, namely shaping, annealing, rough cutting, heat treatment and grinding [1, 2]. Hard turning eliminates annealing and grinding ...

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Hard turning is often performed dry, eliminating both coolant costs and the need for coolant disposal. Hard turning produces easily recycled chips, whereas grinding produces sludge that must go through a costly separation …

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HARD TURNING/GRINDING. The process integration of hard turning and grinding technologies in a single working area includes both shaft-type workpieces and chuck parts such as sun shafts, shaft bevel gears, gearwheels, sliding sleeves etc. Complete machining in a single clamping achieves the highest precision and surface quality. In addition, set ...

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Compared with grinding, the most significant difference between hard turning and grinding is that hard turning may induce a relatively deep "surface" compressive residual stress,, while achieving an equivalent or better surface finish, form, and size accuracy. The different characteristics of residual stress induced by hard turning and ...

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A grinding process can achieve a 6 Ra surface finish, hold a size tolerance of less than 0.0002 inch and grind parts to within 30 millionths roundness. 2. Grinding provides a more cost-effective and stable process than turning for ceramic and carbide material. Hard turning carbides or ceramics requires diamond (PCD or CVD) inserts.

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The benefits of combining hard turning and grinding can include complete machining, improved component quality and greater flexibility. This technology combination can also be effective in reducing cycle times. Machining a part complete on one machine can drastically reduce throughput times, transport times and interim storage times.

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Unlike hard turning processes, the grinding operation will generate scroll-free surfaces on the same machine. The problem of rear end faces being difficult to reach with a grinding wheel is solved with hard turning. The cross …

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While advancements in CNC machine tool technology and tooling have made drastic strides in favor of hard turning, we grinding guys can rest assured there will always be a need for CNC grinding. 7 Reasons to Grind Rather Than Hard Turn: Surface finish, size and roundness requirements: A grinding process can achieve a 6Ra, hold less than a .0002 ...

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