Mechanical Technology January 2015

Mechanical Technology — January 2015

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Hydraulic and pneumatic systems

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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 %.

ith its new CSH die cushion

drive, which consists of a servo

pump with a double-acting die

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,

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

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.

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.

“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

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

factors are viewed through the eyes

of sustainability, ensuring that we are

creating an environment in which our

group can grow,” Contat concludes.