A new generation of servo-driven mechanical presses
The performance of the servo drive is an important index that affects the machining performance of CNC machine tools and is a key technology in metal forming processing. Schuler's new generation of mechanical presses with servo drives, using variable-servo drive technology, enables rapid adjustment of the range of automated blanking and forming presses, providing a press tonnage range of 250 t. Applications range from 315 t, 400 t, 500 t, and 630 t.
All press features using this technology are standard, with integral airframe and standard component modules. According to the prescribed mold and automation concept, the new press can be operated either by multi-station presses or by presses with step mold technology.
Fig. 1: Blanking presses and forming presses with automatic feeding device and Schuler manipulator system, with servo drive, max. tonnage 400t.
For customers, not only press systems are needed, but also equipment tailored to the specific needs of the press shop. Schuler will work with customers to study which bed size is best suited for manufacturing parts, and how to make full use of existing molds to develop the entire system solution - including presses and all peripherals: from the piece feed device, Rolling material lines, to the mold technology, 3-axis transmission systems and unloading devices, etc., can be provided one-stop. <
Fig. 2: Shortly after the introduction of the new press, Schuler received orders for 2 lines from a German parts supplier. Compared to the use of conventional mechanical eccentric presses, Saxonia-Franke, a customer of Schuler in Germany, has been able to increase production by 40%. Faul, the company's production manager, pointed out: "The new servo drive concept makes it easy to adjust slider movement for each part individually, allowing us to flexibly manufacture a wide variety of complex parts."
Unique servo drive
The development of automatic blanking and forming presses is intended for use in press shops where parts are supplied in different batch sizes with different tooling technologies. The flexibility of the new press series stems from its unique servo drive. The device is directly connected to the eccentric without the use of clutches and flywheels. Since the driving speed can also be freely adjusted, the characteristics of the movement and the force can be changed in the stamping stage, so that the slider curve can completely conform to the corresponding application. Therefore, the slider can be precisely positioned to slow down or move at a constant speed during stretching. This not only improves part quality, but also reduces mold wear.
Fig. 3: Accurate test mode can be achieved with manual wheel function
The free programming of the drive enables the sliding curve to be consistent with the frequency of the press automation equipment, thereby effectively increasing production. Free programming of the slider movement indicates that the slider can be operated in reverse (oscillating stroke), thus completely replacing the mechanical adjustment function of the slider.
At the same time, the servo press is also an ideal tryout machine, which can be accurately positioned by using the handwheel to adjust the mold while using the fine-tuning movement slider. In addition, the slider can also be moved in reverse at any position.
Servo drive for metal forming
It can be seen that this new generation of presses combines the flexibility of hydraulic presses with the speed advantages of mechanical systems to achieve the diversity of sports. For example, successfully tested programs for various applications can be stored and quickly recalled on other occasions, which reduces the downtime and improves production efficiency for the process of commissioning machined parts. Because the new device does not require clutches and flywheels, the press requires less maintenance.
Flexible automatic blanking and forming presses are driven by high-power motors. Although used for the same mold and output, the new generation of presses has a higher cluster power than a mechanical press using a conventional drive system, but it requires less overall power than a conventionally driven press. This is because the clutches and brakes require extra power during the start and stop operation of a conventionally driven press.
Fig. 4: The operator can optimize the movement curve in the mould data via the device's operating interface system
The direct connection of the motor and the eccentric is also the main feature of this servo drive. By changing the rotation speed of the motor, the slider can be accelerated or decelerated as required. When not in use, the machine tool can also be operated with the same performance and stroke speed as the conventional press, but the flywheel is not used.
The advantages of servo-driven automatic blanking and forming presses can be summarized as follows:
1. Compared with the conventional drive concept, the output is increased; 2. The slider speed and movement are freely programmable and more flexible; 3. It is suitable for all kinds of forming and processing of high-strength steel; 4. Due to the forming movement The optimization of the parts is of high quality and the service life of the mold is long; 5. The output is optimized by adjusting the movement of the slider, which can be processed by the stepping die or multi-position die; 8. The sensitive test die operation can be performed. Any position inverter slider movement; 9. Due to the press modular design, the use of standardized components, short delivery time, is conducive to spare parts management.
Pellet Mill Accessories widely used in blanking, die forging, cold heading, extrusion, powder metallurgy parts pressing, pressure casting, and engineering plastics, rubber, ceramics and other products of the pressure molding or injection molding process.
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