20.09.2005

Quality and precision at 800 strokes per minute

High-speed blanking press SAK 160 Mark II

Stamping Days/Pforzheim - Schuler has revamped its successful SAK range of presses and greatly improved the performance of this high-speed press for blanking small parts, such as coin blanks, chain link plates or aluminum slugs. Compared with the previous maximum stroking speed of 650, the SAK 160 Mark II now reaches 800 strokes per minute. Despite the higher stroke rate, the SAK still guarantees maximum quality and precision in the blanking of parts.

Design improvements add more dynamics

Thanks to numerous improvements in its design, the new SAK is more dynamic and accurate than its predecessor. The larger motor offering 84 kW is mounted via vibration dampers. The flywheel is not mounted directly, but via bearing sleeves on the shaft. This extends the useful life of the bearings. A wear-free, hydraulic clutch-brake combination running in an oil bath enables the press to be stopped during the stroke – even at maximum stroking speeds. This greatly reduces the danger of punch breakage. The sealed clutch-brake-system also prevents penetration of abraded matter into the system.

Maximum blanking stroke damping

For such high stroking speeds, maximum stroke damping plays a vital role: the press and die are protected, useful life of the dies is raised and part quality is improved. Schuler has achieved this by means of a combined mounting of the eccentric shaft and connecting rods. Whereas the eccentric shaft is guided by full-type cylindrical roller bearings, in order to minimize any play in the drive, the connecting rods are guided by bronze bushings to avoid vibration. The slide gib is also mounted clearance-free in pre-tensioned roller bearings. The aim is also to raise die life and the accuracy of the produced parts. Furthermore, the lower slide gib has been pulled down to the infeed height of the material.

Dynamic mass counterbalance provides stability

For high speeds such as those reached by the SAK, a dynamic mass counterbalance is essential. It enables the press to be mounted on anti-vibration elements directly on the stamping plant floor without complicated fixing or heavy foundations. The press body features a traditional mono-block design. The high rigidity and accuracy of this design reduces any deflection of the press and thus guarantees high part quality.

Online coil thickness measurement

The online coil thickness unit ensures that parts which deviate from their correct material thickness are automatically ejected from production, but without interrupting the production process in any way. There is thus no need for any subsequent sorting.

Exact feed even at high speeds

The press is fitted with Schuler’s freely programmable high-performance servo roll feed WE 2. The roll feed accuracy amounts to +/- 0.05 mm, irrespective of stroking speed. There is thus no need for feed length adjustment – even at 800 strokes per minute. As your systems partner, Schuler also offers decoilers and straightening machines as well as recoilers or further systems for waste disposal.
The predecessor of the SAK 160 Mark II has been sold to numerous minting plants since 1990 for the production of coin blanks as well as to manufacturers of chain link plates, washers, aluminum slugs, rotor and stator laminations and cup springs.