A novel main drive system for the servo press: Combination of integrated motor and symmetrically toggle booster mechanism

At present, the servo press is developing vigorously. This paper focuses on the main drive system of the servo press. Different from conventional main drive systems (single-sided output servo motor; unilateral bias fixed installation; large belt wheel or large gear transmission), the novel main drive system adopts a two-side output integrated servo motor (floating and central installation). The integrated servo motor is connected with the symmetrical toggle booster mechanism through a planetary roller screw pair, making full use of the resources of the integrated motor and transmission structure. By removing the large belt wheel, the moment of inertia of the novel main drive system can be greatly reduced. Furthermore, the novel main drive system has excellent mechanical and motion characteristics (Low-speed forging, high-speed return). More importantly, the novel main drive system through simple mechanical combination in parallel, constituting multiple sets of the novel main drive system, can be applied to servo presses of different tonnages (small, medium, and large). It facilitates the standardization and serialization of the main drive system, and it has the characteristics of large-scale industrialization and low-cost manufacturing. Accordingly, theoretical analysis and simulation are carried out for the novel main drive system, and a new servo press synchronously driven by two sets of the novel main drive systems is designed and manufactured for motion characteristics experiments and sheet blanking tests. The results manifest that the novel main drive system can achieve the above objectives and has feasibility and practicability.