Product category:
CNC turning centres, mill/turning, multi-tasking centres, horizontal and VTLs.
News Release from: Mills Manufacturing Technology | Subject: Vertical turning centres
Edited by the Manufacturingtalk Editorial
Team on 23 October 2007
Turret-type VTLs machine high volumes
Four different sizes of 'turret-type' vertical turning centres have been designed for high-precision part manufacture, and especiallyt manufacturers machining heavy and awkward-shape workpieces
Leamington-based - Mills Manufacturing Technology - the exclusive dealer of Doosan Infracore machine tool products in the UK and Ireland has recently introduced four different size 'turret-type' vertical turning centres to its range of products The four machines: VT450; VT750; VT900 and VT1100 have been designed for high-precision part manufacture, and are especially aimed at manufacturers machining heavy and awkward-shape workpieces, large diameter ring-type applications or high volume automotive-type parts
This article was originally published on Manufacturingtalk on 23 May 2001 at 8.00am (UK)
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Said Drew Jack, technical director at Mills: "Our vertical turning machines are being used by customers for specialised applications in the automotive and aerospace sectors.
All of the Doosan VT machines are characterised by their accuracy, rigidity and competitive pricing.
They are packed with productivity-enhancing features (as standard) - and their productivity can be further increased through automation (i e, robots for workpiece loading/unloading).
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'Typical components machined on the Doosan VT machines vary but include: brake disks, brake drums, fly wheels etc used in the automotive sector, and various ring-type components used in the manufacture of aero-engines.
Machine features are as follows.
* The smallest machine in the Doosan range, the VT450, has a chuck size (305mm), a maximum turning diameter of 450mm, and axis travels Z= 450mm with 20m/min rapid feeds (X-axis and Z-axis).
* The largest machine VT1100, by comparison, has a chuck size up to 1000mm diameter, with a turning diameter of 1100mm, and 1000mm (Z axis) - again with 20m/min rapid feeds on X and Z.
This capacity puts the VT1100 in the same turning capacity sector as some equivalent ram-type VTLs said Mills to manufacturingtalk.com.
* Strong structure - Doosan VT machines feature a heavily-ribbed box shape machine bed made from Meehanite cast iron.
The machine bed is rigid and thermally-stable and ensures high part accuracy and repeatability even during heavy-duty and interrupted cutting operations.
The machines have an optimised swarf management system (chip box or chip conveyor) with a bed flush coolant system that quickly removes swarf and prevents heat build-up in the work area.
The machines' column construction also feature wide, hardened and ground box ways that reduce vibration during machining operations and, as a consequence, improves accuracy and surface finish, and extends tool and spindle life.
Doosan VT machines are equipped with high-performance cartridge spindles that have an axial- symmetric construction for greater accuracy.
The spindles are supported by a double row of tapered roller bearings located at the top and bottom of the spindle - and angular thrust bearings give high radial load capability.
The larger models also have gearbox drive to provide high torque for turning large diameter workpieces at low rpm.
Spindle speeds vary according to the machine model - VT450 machines have 22kW, 2,500rpm main spindles - the larger VT1100 machines have powerful 60kW, 850rpm spindles.
All VT machines feature a 12-station turret with three-piece Curvic coupling construction delivering increased rigidity and stability, and ensuring high accuracy even during heavy cutting operations.
Turret index time is 0.25s.
Optional features include an automatic door for quick and safe workpiece load/unload; tool pre-setting capability; and a range of specialised tooling, etc.
The VT450, 750 and 900 can also be offered with driven tooling and in twin spindle versions.
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