Mechanical Technology January 2015

⎪ Hydraulic and pneumatic systems ⎪

Energy recovery and die press solutions Voith Turbo H+L Hydraulic has launched a servo-driven die press and die cushion combination: the Voith CSH Die Cushion Drive and its partner, the PSH Press Drive. This servo-hybrid drive solution, due to the application of energy recovery principles, can reduce energy consumption of component pressing processes by up to 80 %. W ith its new CSH die cushion drive, which consists of a servo pump with a double-acting die

force, position control, and acceleration. The result is not only increased process variability, operators also benefit from increased productivity while simultane- ously improving the quality of the parts produced. How is that possible? The accel- erated die cushion adjusts to the position- time curve of the ram and, in contrast to a single-acting die cushion, reduces tool impact on the workpiece. This improves surface quality, protects the machine and tool, and prevents damage such as cracks and creases on workpieces. New energy efficiency standards The PSH press drive from Voith is known for high energy efficiency. The intelligent control system permits a very flexible use of the press. The PSH therefore guaran- tees the best possible matching of power and speed to the pressing process. Thus, the press only uses as much energy as required by the relevant process phase. With the combination of a PSH press drive and the new CSH die cushion drive, Voith has now developed a system that sets new standards in the world of servo presses: Press operators can save up to 80 % on energy use by adopting this combination, which will improve total cost of ownership (TCO) while simultaneously increasing productivity. The unlimited programmability of the drive concept

cushion, Voith has launched an innova- tive drive concept for demanding forming processes. The CSH die cushion drive needs no valves and reduces energy consumption of the press significantly. In combination with the efficient PSH press drive, press operators can save up to 80 % on energy use by adopting this solution for the future. Conventional die cushion drives have a die cushion and a pressure-relief valve, which means the work done by the die cushion is irretrievably lost following each pressing operation. In contrast, the Voith system feeds the mechanical power of the servo pump back to the process through the motor to regenerate electrical power. This reduces net energy consumption and makes unprecedented energy ef- ficiency levels achievable. Furthermore, the servo-hybrid CSH die cushion drive uses a smaller oil reservoir, less oil and requires no costly cooling to dissipate wasted energy. This die cushion drive with its double- acting die cushion is ideal for forming processes involving complex geometries. The advantages are obvious: the CSH provides exceptional repeatability; and is freely programmable in terms of speed,

gives operators new capabilities when it comes to demanding forming processes. Both the PSH and the CSH can be easily scaled up into the megawatt range. Voith Turbo H+L Hydraulic is a sub- sidiary of Voith Turbo and specialises in intelligent drive solutions and systems for customers in the oil and gas, energy, min- ing and mechanical engineering, marine propulsion, rail and commercial vehicle industries. q The combination of the servo-driven PSH press drive and the new CSH die cushion drive reduces energy consumption by up to 80 % by using energy recovery principles after completion of a pressing operation. The displaced hydraulic oil from the exhaust sides of the double acting cylinders drives the servomotors backwards to regenerate electricity.

The CSH die cushion drive from Voith.

The heart of PSH and CSH die cushion drives are Voith servo pumps.

factors are viewed through the eyes of sustainability, ensuring that we are creating an environment in which our group can grow,” Contat concludes. q

giving our employees every opportunity to grow their careers within the group and, of course, on making a profit at the end of the day. All three of these

“We’re focusing strongly on imprint- ing the Micron culture on Skyjacks Tailifts. This culture is based on a com- mitment to customer satisfaction, on

Mechanical Technology — January 2015

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