DANOBAT VTC vertical turning centres: precision and versatility in the machining of large parts

(PresseBox) ( Herborn, )
Within the extensive range of lathes that DANOBAT offers, the VTC range stands out; these are multifunction vertical turning centres for machining parts of up to 8000 mm in diameter and more than 4000 mm in height.

The VTC range offers precision and quality in turning, grinding, milling, drilling, threading and measurement operations, which places it in a strong position within sectors such as aerospace, energy, mining, oil and gas, ship building, etc. This is due, in part, to its modular design that allows quick and efficient manufacture of large parts and to the wide range of configurations that DANOBAT offers to address the specific needs of each customer.

The VTC structure is made up of four main assemblies: base, column(s), cross rail and Ram slide, all manufactured from cast iron, which is stabilised before the final machining. This provides the whole assembly with great rigidity and ensures, at the same time, the absorption of stresses and damping of vibrations induced by cutting forces even in the most extreme stock removal work. The design of these lathes has been optimised by means of finite element calculations, its structure is fully symmetrical thus providing high thermal resistance to temperature changes that are generated during the machining process.

At the next EMO 2013 DANOBAT, the vertical turning centre VTC-2800 model will be exhibited, among others, which can machine parts with a diameter and height of up to 2800 mm and up to 15,000 kg. This lathe is aimed at the wind power sector, specifically at the machining of the planet gear carriers of the wind generators. The purpose of this part is to transmit the movement from the generator blades to the multiplier and to the housings that support the shafts and gears.

In this model, the 2500 mm diameter chuck is mounted directly on high precision crossed roller bearings, while for the models designated with an H (VTC-H), the table is supported radially and axially by hydrostatic bearings.

In order to achieve a reduction in machining times, DANOBAT offers the option of installing two RAMs that can operate simultaneously or individually. In this case, the VTC-2800 has a single motor-driven RAM together with an ATC with 10 new tool holders designed exclusively for this application. Furthermore, a robot with a 160 positions has been included for changing turning, milling and drilling tools.

The positioning of the tool carriers is achieved using a Hirth gear system that ensures precision and repeatability during tool changes.

The travel of the RAM X and Y-axis for this model is 3300 mm and 1500 mm respectively. DANOBAT offers the option of applying hydrostatic technology to the linear axis slideways and of adding a controlled C-axis on the chuck allowing demanding machining operations to be carried out, as well as interpolation operations.

Among the 10 new heads that this model includes is the Y-axis, a head designed by DANOBAT; it has a programmable travel of ± 200 mm and a working diameter of 600 mm (depending on the cutting tool). This head has a ± 60º rotation with respect to the X-axis, thus allowing keyways to be machined on gears and offset faces on a component, as well as the drilling and threading of horizontal holes, the axes of which do not pass through the centre of the part, etc.

In addition to the Y-axis, DANOBAT has designed other heads that enable operations to be carried out such as the machining of inclined faces, vertical machining offset with respect to the Z-axis and even a head that accepts four tools simultaneously.
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