The special machine ROLLER 2800 CNC

The special machine ROLLER 2800 CNC is built based on our standard turning machine MT 70/3000 CNC. The function of the machine consists from rolling technology of cylindrical and transition radius surfaces of shaft-shape parts (e.g. wheels axles). These technological possibilities of machine predestine using of machine for special parts production with possibility of rolling surface technology.

A rolling device is located on the longitudinal support. The movement of support is obtained by CNC controlled Z axis by machine’s bed in longitudinal direction. The movement is realized by rolling head quills in X axis direction. Rolling heads serving for clamping of rolling tools. Quills as well as rolling heads movement is made out hydraulically.

Rolling technology enables as rolling of cylindrical surfaces as transition radius or others surfaces. The kinematic of rolling process is given by condition that vector sum of immediate radial and axial force of rolling tool works vertically to rolling surface. This condition enables tilting of rolling heads in range of ±35° from middle position, which is vertical toward machine´s spindle axis (B axis). Tilting of heads is realized as independent double CNC axis. Tilting arrestment of rolling heads in given position is secured by drive with self-locking warm gearboxes.

Because of hydraulic drive of quills of rolling heads, the machine is delivered with a hydraulic unit. For press control of rolling process the hydraulic unit contains special proportional reduction valve. The valve enables continuously fluent change of pressure, it mans change of force of rolling tools during working cycle in defined range of pressure. A checking manometer, located on rolling quill head, enables direct monitoring of force of rolling tool.

Next advantage of the machine is indirect, independent measurement of rolling force, which is registered during cycle and archived. The machine allows comparison of real force with required. The control panel conforms to rolling process.

Another difference of ROLLER 2800 machine is adjustment of tailstock for hydraulic controlled quill. For secure transfer of axle forces, arising from rolling of tilting rolling heads (B axis) from zero position, the tailstock is equipped with special locking device and headstock of machine is placed on the bed with intensified centring point too.

As special accessory for rolling technology the machine disposes of system of lubrication oil supply on rolling tools. The lubrication oil supply consists from separate container with pump and special collecting tank located under machine working space.

Whole system of rolling support is integrated into covering space of machine. Sliding guideways of additional rolling support are lubricated from central lubrication system. The machine can run in manual or automatic cycle. In automatic cycle the operator of the machine is responsible for clamping and unloading of workpieces from working space and working cycle checking.