Open-Type Single-Point Servo Power Press Suppliers

Versatile Slide Motion Profiles of the Open-Type Single-Point Servo Power Press

The Transition to Servo-Driven Mechanical Motion

Traditional mechanical presses utilize a fixed flywheel and crankshaft to drive the slide in a predetermined harmonic motion. This mechanical limitation means the speed and stroke length of the slide are constant for any given cycle, offering no flexibility to adjust to varying material requirements. In contrast, an open-type single-point servo power press replaces the traditional flywheel and clutch system with a high-torque, low-speed servo motor coupled directly to the drive mechanism. This direct control allows the operator to program the rotation of the main shaft in real-time, effectively customizing the speed, position, and acceleration of the slide at any point during its downward and upward travel. This advancement enables manufacturers to adapt a single piece of machinery to a wide array of forming processes, ranging from high-speed blanking to deep drawing of complex profiles.

By removing the physical constraints of the classic flywheel, the press can execute customized deceleration and acceleration curves that match the precise deformation limits of the workpiece. This capability is useful when working with modern materials like advanced high-strength steels and lightweight aluminum alloys, which are prone to springback and tearing under conventional stamping speeds. The transition to servo technology represents a fundamental shift in how kinetic energy is managed in the stamping shop, giving operators control over the stroke profile while maintaining the structural accessibility of the C-frame design.

Crank and Link Simulation Modes

Within the programming suite of the open-type single-point servo power press, the crankshaft simulation mode reproduces the classic sinusoidal movement profile of conventional mechanical machinery. This mode is useful for standard stamping, progressive die applications, and high-volume production where specialized velocity curves are not required. By rotating the drive motor at a constant speed through a full 360-degree rotation, the slide reaches its maximum velocity at the midpoint of the stroke and slows to zero at bottom dead center. This replication ensures compatibility with existing tooling that was designed for traditional mechanical presses, providing a familiar baseline for daily shop operations.

Additionally, the controller can simulate link motion profiles without requiring complex physical lever mechanisms. In conventional presses, link motion is achieved through a network of physical rods that slow down the slide near the bottom of the stroke while accelerating it during the upward recovery phase. The servo drive achieves this velocity modification purely through electronic speed adjustments during a single cycle. Zhejiang Bolun High-Precision Machinery Co., Ltd. builds control interfaces that allow operators to configure the exact decelerating curve required to match the drawing threshold of specific sheet metals, reducing the mechanical complexity and maintenance requirements associated with dedicated link-drive machinery.

Pulsing and Pendulum Motion Modes

The pendulum motion mode, also known as the swing or half-stroke mode, is a unique operational profile that does not require the drive motor to complete a full rotation. Instead, the servo motor rotates the eccentric shaft forward to a specified angle, drives the slide through its working stroke, and then reverses direction to return the slide to the top starting position. Because the motor only swings through a limited arc, the overall stroke travel is shortened, which reduces cycle times and increases production speed for shallow forming or blanking operations. This mode is highly beneficial when processing continuous strip materials where full vertical clearance is unnecessary, allowing for high stroke rates while saving energy.

For progressive or multi-stage forming of difficult-to-form metals, the pulsing or incremental step mode is utilized. In this configuration, the open-type single-point servo power press does not press the metal in a single continuous movement. Instead, the slide descends in a series of micro-strokes, applying force incrementally. This step-by-step deformation allows internal material stresses to distribute more evenly, reducing localized thinning and avoiding fracture lines in high-strength alloys. Each pulse can be programmed with distinct dwell periods, letting the metal rest and stabilize between press segments to achieve a more uniform material flow.

Bottom Dwell and Constant Velocity Drawing Modes

In deep drawing and cold forging, controlling the metal flow at the bottom dead center is critical to maintaining uniform wall thickness and minimizing springback. The bottom dwell mode allows the slide to come to a complete stop at the bottom of the stroke for a specified duration while maintaining full tonnage pressure. This pause gives the material sufficient time to undergo plastic deformation and take the shape of the die cavity permanently. Once the dwell period expires, the servo motor restarts to return the slide to its starting position, resulting in parts with consistent dimensional accuracy and minimal residual stress.

The constant velocity drawing mode adjusts the slide speed dynamically during the critical forming phase. Standard crank drives cause the slide to accelerate continuously until the midpoint, which can exceed the drawing speed limits of sensitive materials like aluminum or titanium. The servo press controls the motor rotation to ensure the slide maintains a flat, constant speed curve through the entire draw depth. Once the forming stage is complete, the slide accelerates rapidly on the return stroke, optimizing productivity without risking material tears or wrinkles. This control allows manufacturers to run delicate parts successfully on a standard production line.

Operational Characteristics of Servo Motion Profiles

The following table provides a comparison of the primary motion profiles available on modern servo-driven single-point presses, detailing their typical parameters and primary application areas.

Mechanical and Thermal Support for Specialized Motion Profiles

To execute these complex motion profiles repeatedly, the physical construction of the open-type single-point servo power press must handle varied mechanical and thermal conditions. Reversing the heavy servo motor and slide components during pendulum or pulse operations generates substantial heat and dynamic torque fluctuations. Robust frame engineering and cooling circuits are necessary to stabilize the motor and drive temperatures. Additionally, precise linear guide gibs are integrated to ensure slide verticality is preserved even when the motor undergoes rapid direction changes under full load.

Bolun Machinery applies structural design principles and precision components to ensure that the slide remains parallel under these dynamic operating modes, protecting both the drive mechanism and the tooling from premature wear. A continuous forced lubrication system maintains a consistent oil film across all sliding surfaces, absorbing the shock forces associated with pulsing operations. This combination of thermal management, structural stiffness, and programmable servo control ensures that the machinery remains a stable and reliable platform for diverse industrial stamping demands over long service lifetimes.

FAQ

Q: How does the programmable slide motion of an open-type single-point servo power press help minimize springback in high-strength materials?

A: By replacing the traditional flywheel with a high-torque servo motor, the slide motion can be fully customized. Zhejiang Bolun High-Precision Machinery Co., Ltd. programs these presses to execute a bottom dwell or slow-down profile near the bottom dead center, allowing the material sufficient time to undergo plastic deformation and permanently set its shape.

Q: What measures are in place on Bolun Machinery servo presses to handle the extreme heat and torque fluctuations of rapid pendulum or pulsing modes?

A: Operating in pendulum or pulsing modes requires rapid motor deceleration and direction changes, which generate substantial thermal and mechanical stress. Our open-type single-point servo power press designs incorporate dedicated liquid-cooling circuits for the servo drive and an automatic, high-pressure forced lubrication system to dissipate heat and protect the main shaft bearings.

Q: Can the slide stroke length and speed be optimized for shallow stamping parts to increase hourly output?

A: Yes, using the pendulum motion mode, the servo motor only swings through a programmed partial angle rather than completing a full 360-degree rotation. This shortens the stroke path and decreases cycle times, allowing manufacturers to achieve high production rates for shallow parts while saving energy compared to full-stroke operations.

Q: How do your servo power presses maintain slide parallelism during asymmetrical, off-center loading cycles?

A: Despite having only a single connection point, the slide is guided by extended, precision-machined eight-point gibs with exceptionally tight clearances. This heavy-duty guiding configuration works alongside our rigid, stress-relieved C-frame to absorb lateral forces and prevent slide tilting throughout the forming stroke.

Q: Does Zhejiang Bolun High-Precision Machinery Co., Ltd. offer custom-developed software profiles for unique, proprietary forming processes?

A: We provide full R&D, design, and software customization services. Our engineering team can develop and integrate tailored motion profiles, including constant-velocity draw curves or multi-step incremental pulsing cycles, directly into the press control system to meet your exact material and tooling specifications.