With its servo-hydraulic drive solution, Bosch Rexroth is increasing efficiency in sheet metal forming. Recuperation can increase the energy efficiency of deep drawing presses by 30 percent. The modular design simplifies engineering and installation for the machine manufacturer. End customers also benefit from reduced oil volume and smaller installation space. Sheet metal can be formed with increased productivity and quality.
Modern deep drawing presses should form sheet metal with consistently high quality and productivity and consume as little energy as possible. At the same time, machine manufacturers need standardized drive concepts in order to be able to implement a wide range of applications economically. In particular, engineering and installation costs need to be reduced.
The servo-hydraulic drive solution from Bosch Rexroth offers many advantages here.
The modules consisting of a servo-hydraulic pump unit and control block can be used to supply the die cushion and upper piston as required. If both servo-hydraulic solutions are operated with a common electric drive system, such a deep-drawing press achieves energy savings of up to 30 percent compared to a conventional hydraulic press with valve control. The significant increase in energy efficiency is made possible on the one hand by the speed-controlled servo motor-pump unit for the upper piston, which provides the exact power required at every point in the press cycle.
Secondly, during deep drawing, part of the process energy can be recovered in the die cushion via the servomotor-pump unit, which would otherwise be lost if the usual valve control system were used to regulate the die cushion force.
The recovered electrical energy can be made available to the upper plunger via the common intermediate circuit or fed back into the grid. This reduces the energy consumption of the machine directly during the drawing process. Furthermore, the servo-hydraulic drive solution opens up additional savings potential by minimizing the cooling requirements of the hydraulic unit.
The reason for this is the high level of efficiency and the drastic reduction in throttle losses, which leads to less heating of the hydraulic oil. As a result, the power unit can be designed smaller and in some cases cooling can be completely dispensed with, which further reduces investment and operating costs.
More productivity, quality and transparency
The digital control of the servo-hydraulic drive has a positive effect on process quality and transparency as well as productivity.
As the individual pressures, positions, speeds and forces can be controlled very precisely, sheet metal parts can be produced with repeat accuracy and higher quality.
For example, the upper piston drive can also operate at very low motor speeds of just a few revolutions per minute.
At the same time, the fast-reacting servomotors enable shorter cycle times and higher output.
Various pump options with 2-point or proportional adjustment systems through to multi-quantum control further expand the design scope, making the energy-saving drive concept attractive for many other applications. The servo-hydraulic drive also enables data-based analyses for process optimization and condition monitoring to minimize downtimes.
Facts & Figures
As a leading global supplier of drive and control technologies, Bosch Rexroth ensures efficient, powerful and safe movement in machines and systems of all types and sizes.
The company bundles worldwide application experience in the market segments of mobile and industrial applications as well as factory automation.
With intelligent components, customized system solutions, engineering and services, Bosch Rexroth creates the conditions for fully networkable applications. Bosch Rexroth offers its customers hydraulics, electric drive and control technology, gear technology, and linear and assembly technology, including software and interfaces to the Internet of Things. With a presence in more than 80 countries, around 33,800 associates generated sales of 7.6 billion euros in 2023.
The Bosch Group is a leading international technology and services company with around 429,000 associates worldwide (as at December 31, 2023).
It generated sales of 91.6 billion euros in the 2023 financial year.
Web: www.boschrexroth.de
Euroblech Hall 11, Stand D08
