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Servo as standard
Premiere at Schuler: new press range from 2,500 – 6,300 kN
Schuler presents a new generation of mechanical presses with servo drives. The new automatic blanking and forming presses of the PSE range can be quickly set up for a wide variety of ap-plications. This is guaranteed by the variable servo drive tech-nology which all presses feature as standard. The new range is available with press forces of 2,500, 3,150, 4,000, 5,000 and 6,300 kN. All presses feature a mono-block body and standard component modules. In this way we can offer customers tried and tested, top-performance technology with high availability at attractive prices, says Bernhard Ewald, Sales Director of Shanghai Schuler Presses. Depending on the specified die and automation concept, the new presses can be operated as either transfer presses or presses with progressive die technology.
The machines have already been well received by the market. Shortly after launching the new press concept, Schuler received orders for two lines from German part suppliers. Mr. Faul, Pro-duction Manager of Saxonia-Franke in Göppingen, Germany, states: The new servo drive concept offers a host of benefits for us. As a flexible supplier, we manufacture complex parts in a wide variety of dimensions for our customers. The possibility to easily and individually adjust the slide movement for each part was a compelling selling point for us.
New forming technologies require intensive consultation. In addition to supplying the press system, Schuler''s all-in package therefore also comprises individual consulting in order to tailor the equipment to the specific needs of the press shop. For exam-ple, Schuler checks with the customer which bed size is best suited to the range of manufactured parts, as well as how exist-ing dies can be integrated. The complete system solution in cludes the press and a full range of peripheral equipment – from blank feeders and coil lines to die technology, three-axis transfer systems and unloaders. One-stop-shopping made by Schuler.
Fast and flexible with servo drive
The automatic blanking and forming presses were mainly con-ceived for press shops using varying die technologies and sup-plying parts in a variety of batch sizes. The flexibility of the new range derives from its servo drives, which are directly connected to the eccentric wheel – without clutch and flywheel. As the drive speed can also be freely regulated, this means that it is possible to vary the movement and force characteristics during the pressing stage and thus adapt the slide curve exactly to the respective application. As a result, the slide can be precisely positioned, slowed down during drawing or moved at a constant speed. This not only improves part quality, but also reduces die wear. The ability to freely program the drive means that the slide curve can be adapted exactly to the frequency of the press auto-mation equipment – an important contribution toward raising output. The ability to program the slide movement also means that the slide can be moved in reversible operation (oscillating stroke), thereby simply replacing the function of a mechanical slide adjustment.
The servo presses are also ideally suited as tryout machines. With the aid of a hand-wheel, the slide can be moved in small steps and precisely positioned while adjusting the die. Slide movement is reversible in every position.
Tremendous kinematic variety
Schuler''s new press generation therefore combines the flexibil-ity of a hydraulic press with the speed benefits of a mechanical system. The new concept stands for maximum kinematic variety. For example, successfully tested programs for various applica-tions can be stored and quickly called up at any time. As a result, manufacturers can minimize downtime while the press is being set up for the next part and thus significantly raise productivity. By omitting the clutch and flywheel, the machines also require less maintenance.
Low energy consumption despite high nominal connected-values
The flexible automatic blanking and forming presses are driven by highly dynamic motors. The new machine generation also boasts a positive energy balance: although peak power is higher for the same die and output than for a mechanical press with conventional drive system, the servo press has a lower overall energy requirement than its conventionally driven equivalent, which requires extra power for the clutch and brake during start/stop operation.
Servo drives for metalforming processes
The main feature of a servo drive is the direct connection be-tween the motor and eccentric wheel. By varying the motor speed, the slide can be accelerated or decelerated exactly as re-quired. This variation of the motor''s speed is optional. If it is not used, the machines work like conventional mechanical presses, however with constant performance and stroking speed. There is no flywheel, as used by conventional mechanical eccentric presses.
The benefits of automatic blanking and forming presses with servo drives at a glance:
•Increased output compared with conventional drive con-cepts
•High flexibility, as slide speed and movement character-istics are freely programmable
•Can be adapted perfectly to various forming processes
•Top part quality and long die service life thanks to opti-mized forming movement
•Well suited to processing high-strength steels
•Optimized output by adjusting slide movement to trans-port process with progressive or transfer dies
•Stroke adjustment thanks to programmable slide stroke (oscillating stroke movement)
•Sensitive tryout operation possible, slide movement re-versible in every position
•Short delivery times and optimized spare part manage-ment due to modular press concept with standardized components
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SERVO DRIVE PRESS |
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