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Hard turning and grinding are competing finishing processes for the manufacture of precision mechanical components such as bearings, gears, cams, etc. Surface hardening at gentle machining conditions has often been reported and is attributed to strain/strain rate hardening and size effect.
Combining multiple technologies on a single machine makes the machining process more complex, but the advantages of consistent integration of such functionality can be worth the effort. The benefits of combining hard turning and grinding can include complete machining, improved component quality and greater flexibility.
#0183;#32;FOR SALE BY PRIVATE TREATY: STUDER S242 CNC hard turning amp; grinding machine (installed new 2009) Swing diameter 180 mm Distance between centres 400 mm 8station turret for fixed tools GE Fanuc
Extreme precision when hard milling after hardening. Turning, drilling, milling and grinding are combined in one single machine. Maximum workpiece diameter: #216; 3,400 mm* Maximum workpiece length: 4,000 mm* Maximum modulus: unlimited Maximum toothwidth: 2,000 mm; Toothing quality: class 16 according to DIN 3962.
2. Grinding provides a more costeffective and stable process than turning for ceramic and carbide material. Hard turning carbides or ceramics requires diamond (PCD or CVD) inserts. Rapid wear and chipping of the inserts can result in size variation or scrapped parts. This adds downtime to change inserts and reestablish part size.
#0183;#32;The combination of a number of processes such as hard turning and grinding on a single machine, allows for the exploitation of considerable rationalisation potentials.
By combining hard turning and grinding, throughput, transport times and storage periods can be substantially reduced to shorten overall cycle times. The machine features a vertical work spindle and tools positioned below the workpiece to allow the turning and grinding chips to fall unhindered. All machine modules are designed to be mechanically
Additionally, several types of grinding machines may be needed to perform the operations able to be performed on a single turning center, further opening the possibilities for equipment cost savings. As mentioned above, a turning center can complete ID turning, OD turning, taper turning, and grooving in a single chucking.
The machine chucks components ranging up to 350 mm in diameter, performing turning and grinding processes progressively in a single clamping. The VLC 350 GT enables traditional hard machining of gears, from hard turning of end faces and preturning of the bored holes and outer synchronizing taper through to finish grinding of those contours.
Combining different machining processes on the same platform has been a major theme in machine tool design for two decades or so. The Studer S242 combines cylindrical grinding and hard turning. A look at this machine shows that both of these machining processes benefit when
Die vertikale Drehmaschine VLC 250 bietet alle M#246;glichkeiten im Bereich der universellen Bearbeitung von Werkst#252;cken.
The process combination hard turning / grinding is used, to great effect, to reduce cycle times. Where the complete hard finishing process (hard turning and grinding) is carried out on a single machine, throughput, transport and storage times can be drastically reduced. There are also advantages in the reduction of setup efforts and setting times.
Grinding, however, achieves higher tolerances than hard turning, but in cases where grinding can be replaced with hard turning, there are numerous benefits. Hard turnings benefits include shorter cycle times and part loading and unloading times as well as chip production that can be recycled and better energy efficiency.
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