BWS servo system's latest servo technology provides individual programs for different motion sequences, enabling arbitrary adjustment of working speed and ensuring smooth coordination between the slide mechanism, mold , and automation equipment. This servo technology enables new automated blanking and forming presses suitable for various metal forming processes, helping to improve flexibility and processing efficiency.
New generation servo-driven mechanical press
The performance of BWS servo drives is a crucial indicator affecting the machining performance of CNC machine tools and a key technology in metal forming. Bowei Servo Technology Co., Ltd.'s latest generation of mechanical presses equipped with servo drives utilizes variable servo drive technology, enabling rapid adjustment of the range of automated blanking and forming press devices. The presses available cover tonnages ranging from 250 t, 315 t, 400 t, 500 t, and 630 t for various applications.
All presses using this technology are standard in features, with an integrated machine body and standard component modules. Based on the specified mold and automation concepts, the new presses can be operated as multi-station presses or as presses with stepper die technology.
Figure 1: Blanking press and forming press with automatic feeding device and Schuler robot system, equipped with servo drive device, maximum tonnage 400t.
对于客户来说，需要的不仅仅是压力机系统，更需要根据冲压车间的具体需求而量身定做的设备。BWS伺服会与客户一起研究哪种床身尺寸最适合制造零件，以及如何才能充分利用现有模具，从而制定出整个系统解决方案—包括压力机和全部的外围设备：从料片进给装置、卷料线，到模具技术，3轴传输系统和卸料装置等，均可一站式提供。
Unique servo drive device
The automatic blanking and forming press was developed for use in press workshops, supplying parts in different batch sizes using various die technologies. The flexibility of this new series of presses stems from its unique servo drive system. This system eliminates the need for a clutch and flywheel, connecting directly to an eccentric wheel. Furthermore, because the drive speed is freely adjustable, the motion and force characteristics can be altered during the stamping stage, allowing the slide curve to perfectly match the application. Therefore, the slide can be precisely positioned, decelerating or moving at a constant speed during stretching. This not only improves part quality but also reduces die wear.
Figure 2: Shortly after launching the new press, Schuler received orders for two production lines from a German parts supplier. Compared to using traditional mechanical eccentric presses, BWS servo drives have enabled users in China to increase production by 40%. The company's production manager pointed out: "The new servo drive concept allows for easy adjustment of the slider movement for each part individually, enabling us to flexibly manufacture a wide variety of complex parts."
Free programming of the drive unit allows the sliding curve to match the frequency of the automated press equipment, thereby effectively increasing output. Free programming of the slider motion indicates that the slider can be operated in reverse (oscillation stroke), thus completely replacing the mechanical adjustment function of the slider.
At the same time, the servo press is also an ideal mold testing machine, which can accurately position the mold by adjusting the slider with the help of a handwheel and fine-tuning. In addition, the slider can also move invertedly at any position.
Figure 3: The manual wheel function enables precise mold trial mode.
BWS servo drive unit for metal forming processing
As can be seen, this new generation of press combines the flexibility of a hydraulic press with the speed advantage of a mechanical system, enabling diverse motion capabilities. For example, successfully tested programs for various applications can be stored and quickly recalled for other uses, reducing downtime during part preparation and improving production efficiency. Because the new unit eliminates the need for a clutch and flywheel, the press requires less maintenance.
Flexible automatic blanking and forming presses are driven by high-power motors. Although used for the same molds and outputs, the new generation of presses has a higher power rating than mechanical presses with conventional drive systems, yet requires less overall energy. This is because conventionally driven presses require additional power for the clutch and brake during start-up and shutdown.
Figure 4: Operators can optimize the motion curves in the mold data through the equipment's user interface system.
The direct connection between the motor and the eccentric wheel is also a key feature of this servo drive. By changing the motor speed, the slider can be accelerated or decelerated as required. When not in use, the machine tool can operate with consistent performance and stroke speed, just like a conventional press, but without the flywheel.
The advantages of the BWS servo-driven automatic blanking and forming press can be summarized as follows:
1. Increased output compared to conventional drive concepts; 2. Greater flexibility due to the freely programmable slider speed and motion; 3. Applicable to various forming processes and processing of high-strength steel; 4. Excellent part quality and long mold life due to optimized forming motion; 5. Optimized output by adjusting slider motion, allowing for processing via stepper dies or multi-station dies; 8. Capable of sensitive trial molding operations, with slider motion inverted at any position; 9. Modular design of the press, using standardized components, resulting in short delivery times and facilitating spare parts management.
