Presses and crank presses

The problem:
In order to ensure the product highest quality, the assembly of the hub bearings for the slicer blades requires the utmost attention and precision, hence it is expensive


To F.A.C. (Cavaria Slicers Manufacturing) this operation used to require a long time as it was manually carried out in 5 different phases (assembly of two bearings, two seegers and of the small shaft with an extremely reduced interposition gap) in a rather awkward place (using a fly press)

How we solved these technical problems:


At first sight, using a crank press seemed too risky to safeguard bearing integrity. High speed made impossible a correct placement, whereas the thrust variation along the run did not ensure an impeccable assembly. Moreover, the wide range and variety of FAC models required the use of a machine with a very wide span.

Therefore, we decided to tackle the problem from three different viewpoints

• Acting on the motor, to reduce the cycle time-frame of the press from 0,33 to 0,66 seconds while applying a constant torque increase and decreasing the inertia
• thus achieving a really precise, orthogonal centring in the bearing seat, through pre-calibrating the thrust spindle with a spring
• where the shutting was on specific alignments, not all equal and in tolerance, in order to avoid and adjustment otherwise excessively complex, by building " underneath the machine " a small table with a run of 12mm, with adjustments of 1/100th of a millimetre and in an easy way

In order to use the press on the slicers various models, we selected a flexible press model, the NCP 30 MBR, as it allows to easily calibrate the span according to requirements

Conclusion:


One single clamping cycle has replaced an assembly stage that previously required five steps with considerable time and cost saving and with a certain improvement of precision, hence of the slicers' quality