At EuroBLECH 2014, Bosch Rexroth introduces customized solutions for sheet metal processing. With easy-to-integrate multi-technology products, functional modules, and system solutions, the company increases energy efficiency and productivity in many classical applications in the industry.
Innovative main drive for servo presses
At EuroBLECH 2014, Bosch Rexroth presents a new solution for use as the main drive in servo presses. The system, consisting of an asynchronous motor with flywheel and axial piston pump A4, drives a hydraulic radial piston motor. The asynchronous motor with flywheel mass is first brought to its rated speed and the rotational energy transferred via the pump to the hydraulic motor. The output speed of the radial piston motor can be changed continuously using the pump’s swivel angle. The output torque of the radial piston motor is then available across the entire speed range.
When the load (press slide) is decelerated, the resulting energy can be saved in the flywheel. In acceleration phases, this energy is then recovered. This allows a significant reduction in the installed electric motor power.
The additional installation of regenerative control units makes it possible to exchange energy with other consumers, for example a cushioning system, in the machine. This enables a further significant reduction in energy demand.
Self-contained hydraulic axis solution in an assembly press
With self-contained hydraulic axis solutions, Rexroth offers engineers the advantages of hydraulic linear motions without the previous expenditure for hydraulic power units and the necessary piping. The solution consists of a ready to install module with an integrated, completely closed fluid circuit, a control block with digital valves and a hydraulic cylinder. The power is supplied by a variable-speed pump drive of the Sytronix family. The self-contained axis requires only an electrical power connection and communicates via a multi-Ethernet interface with the higher level control system. It can thus be flexibly adapted to and optimized for the respective drive function. In this way, machinery solutions can be flexibly implemented according to the modular principle. For production changes, the end user can easily move from machine to machine.
At the trade fair, Rexroth introduces the self-contained axis in an intelligent and economical cell concept that allows a variety of possible variations—as an automatic individual workplace with manual loading of the work piece or combinedinto technologically sophisticated automation systems.
Variable-speed hydraulic and electromechanical drives for press brakes
For press brakes, the Rexroth user can draw on a variety of ready-to-install, tested functional modules for the realization of hydraulically or electrically driven systems of all sizes. The portfolio ranges from control systems to actuators.
Depending on size, application, or manufacturer’s requirements, drive modules consisting of an electric motor and pump and a block with all valves are available for hydraulically driven press brakes. On request, variable-speed pump drives from the Rexroth Sytronix range can also be used for this purpose. The machine designer can choose between 1- to 3-block variants and gets scaled solutions of high individuality, productivity, and safety.
At the trade fair, Rexroth shows a functional transparent press brake with a cost-optimized and energy efficient solution. In addition, the company presents the electromechanical variant in the form of a press brake axis with a planetary ball assembly of frame size 75 × 20 mm. With a dynamic and static load rating of 544 kN or 1,496 kN, this planetary screw assembly provides high load-bearing capacity in relation to the structural dimensions. Numerous contact surfaces lead to high axial rigidity and therefore a long service life. Combined with a servo motor and drive controller, the assembly offers the user a single source mechatronic unit that can move high forces in a very small installation space.
Modular draw cushion axes
For use in mechanical presses or servo presses, Rexroth offers a system with highly dynamic, energy-efficient HP/LP switching and energy recovery during the drawing process. The company implements this with a completely ready-to-install, function-tested plug-and-run cylinder axis.
The modular draw cushion axes are complemented by intelligent hydraulic power units that are adapted to the particular customer specification and by the open, scalable IndraMotion MLC controller for electrical and hydraulic systems. The best-in-class controller and engineering tools in the MLC in optimal interaction with the power unit and the cylinder axis offer customers high productivity and reliability.
With the HP/LP system and energy recovery via a displacer control during the drawing process, the installed power on the unit can be reduced by about 50 percent. The cooler, cooling circuit, and tank can be made up to 50 percent smaller. This reduces the total cost of ownership.
As your system partner, Rexroth not only provides the ready-to-install module in solutions for mechanical or servo presses, but also provides support for design conception, system integration, and additionally desired requirements such as energy savings.