When selecting a hydraulic press for forging or heavy metal forming, the rated force is only one part of the decision. A machine may have sufficient tonnage on paper but still encounter problems related to energy consumption, hydraulic response, positioning accuracy, structural deformation, or long-term maintenance.
Conventional hydraulic systems, for example, may continue operating at relatively high output during idle periods. In applications with frequent approach, forming, holding, and return cycles, this can result in unnecessary energy use. At the same time, slow hydraulic response or limited control of the slide position may make it more difficult to maintain consistent forming conditions.
The mechanical construction of the press is another factor that should not be overlooked. Repeated high-load operation places considerable stress on the frame and hydraulic system. If welding stress is not properly relieved, structural deformation may develop over time. Similarly, poorly designed hydraulic connections can create leakage problems that increase maintenance requirements.
This is where a modern servo hydraulic press machine can offer a different approach. By combining servo pump technology, rigid frame construction, displacement feedback, and programmable controls, the press can regulate hydraulic output and slide movement according to the actual forming process.
Why Servo Pump Control Is Important
One of the main differences between a conventional hydraulic press and a servo-driven system is the way hydraulic power is delivered.
A conventional system may operate the pump at a relatively constant level even when the process does not require maximum hydraulic output. A servo pump system, in contrast, can adjust pump operation according to the current requirements of the press.
The hydraulic requirements during rapid approach are not the same as those during the actual forming stage. Pressure holding and slide return can require completely different combinations of flow and pressure as well. Servo control allows these operating conditions to be managed according to the programmed cycle.
When the press is not under significant load or is waiting for the next operation, hydraulic output can be reduced. This can help lower unnecessary energy consumption during periods when full pump performance is not required.
There is also a control advantage. With displacement feedback and PLC-based control, the machine can coordinate slide position, speed, and hydraulic output more precisely throughout the cycle.
This can be useful in automated forging and stamping lines. Fast approach and return movements can be combined with controlled forming pressure, while auxiliary equipment such as feeders, ejectors, spraying systems, and workpiece handling equipment can be integrated into the production sequence.
The goal is not simply to make a hydraulic press behave like a mechanical press. Rather, the advantage is to retain the adjustable pressure and stroke characteristics of hydraulic forming while improving control of the overall cycle.
Don't Evaluate the Frame by Tonnage Alone
A high-capacity hydraulic system needs a mechanical structure that can repeatedly withstand the corresponding loads. For heavy forging, frame rigidity therefore deserves the same attention as hydraulic pressure and nominal forming force.
The YB27 Series Servo Hydraulic Press from Bailiyuan Hydraulic uses an FEA-designed high-strength frame. Finite Element Analysis (FEA) can be used during structural development to identify stress concentrations and potential deformation areas. Engineers can then reinforce and optimize important load-bearing sections based on the actual stress distribution.
Frame manufacturing and stress treatment are equally significant. The YB27 Series frame undergoes annealing and aging heat treatment to help release residual welding stress.
Why does this matter in production?
During repeated heavy forming operations, excessive frame deformation can affect the relative position of the tooling and workpiece. Even if the hydraulic system delivers the required force, changes in structural geometry under load can influence dimensional accuracy and process consistency.
A rigid and properly treated frame provides a more stable mechanical foundation for the hydraulic and position-control systems.
Hydraulic Piping Is Another Maintenance Consideration
Hydraulic piping is sometimes overlooked during equipment evaluation, even though it can have a direct impact on maintenance and reliability.
The YB27 Series adopts a top-mounted hydraulic oil tank to facilitate smoother oil suction. Its hydraulic piping uses a German 37-degree flare fitting system together with Walform® tube forming technology.
One notable characteristic is the use of weld-free pipe connections.
Reducing welded connections can reduce the number of potential leakage points in the hydraulic circuit. It also avoids some of the process variations that may occur with welded hydraulic piping.
This can become particularly relevant in high-frequency production environments. A small hydraulic leak may initially appear insignificant, but recurring leakage can eventually result in fluid loss, maintenance downtime, and additional operating costs.
Which Specifications Actually Matter When Comparing Presses?
If the press will be used for demanding forging or forming work, I would not recommend comparing machines by tonnage alone. Several technical areas should be reviewed together.
Frame construction
Look at the overall frame architecture, structural analysis, welding process, and stress-relief treatment. A nominally high-tonnage machine still needs adequate rigidity to maintain stable forming conditions.
Hydraulic response
Consider how the hydraulic system handles changes in pressure and flow throughout the cycle. Servo pump technology is particularly useful when the process alternates between high-speed movement and high-force forming.
Displacement measurement
The YB27 Series can use MTS (USA) or Balluff (Germany) displacement sensors to monitor slide position in real time. This feedback gives the control system more precise information for managing stroke-related operations.
PLC and HMI
The control system uses a Siemens PLC with a bilingual Chinese/English color touchscreen HMI. This provides a graphical interface for monitoring machine status and setting process parameters. Programmable control also helps maintain consistent operating sequences from one cycle to another.
Electrical configuration
The electrical cabinet is CE compliant, which is an important consideration for applicable European-market installations and production systems subject to relevant electrical requirements.
These points are also useful when answering a practical purchasing question: how do you determine whether a hydraulic press is genuinely suitable for heavy forging?
It requires looking at the entire machine rather than one specification. Frame rigidity, hydraulic response, position feedback, control architecture, tooling requirements, and duty-cycle capability all need to match the intended application.
Manual, Semi-Automatic, or Fully Integrated Production?
The right level of automation depends heavily on the production environment.
For manual forging operations, a servo hydraulic press can make sense where workpieces vary frequently, tooling changes are common, or operators need to intervene directly during individual forming steps. Manual operation can also be useful during die setup, process trials, and product development.
Semi-automatic production provides another option when the forming sequence is relatively standardized but loading or unloading still involves operators.
For higher-volume manufacturing, the press can be combined with automated material handling and other auxiliary equipment to reduce non-forming cycle time.
The YB27 Series can be configured with several options, including a movable worktable, external ejector, core pulling device, automatic spraying system, and vacuum system.
These options should be selected according to the actual process rather than simply adding every available feature.
For example, a movable worktable can make die installation and changeover easier. An external ejector can help remove formed components from difficult tooling. A core pulling system can be useful when the workpiece contains more complex internal geometries. Automatic spraying can provide more consistent lubrication or cooling during repetitive forming cycles.
Heating equipment also needs to correspond to the production process. Steam, electric, and thermal-oil heating systems provide different methods of maintaining the required temperature. Selection should consider the material being formed, required temperature range, heating uniformity, tooling configuration, and cycle requirements.
Other options, such as four-corner leveling, may be useful when precise worktable alignment is important. Customized machine configurations can also be considered when the press needs to interface with specific tooling or automation systems.
The Machine Should Be Selected Around the Process
For anyone comparing a Servo Hydraulic Press Machine, the better starting point is the actual forming process rather than the headline tonnage.
The required forming force is obviously important, but it is only one parameter. Worktable dimensions, slide stroke, approach speed, forming speed, return speed, pressure stability, position accuracy, energy consumption, PLC architecture, and automation requirements can all influence whether a machine is suitable for production.
Changzhou Bailiyuan Energy-Saving Hydraulic Technology Co., Ltd. was established through the integration of Yangzhou Xinhang Electromechanical Co., Ltd. and Changzhou Bailiyuan Energy-Saving Technology Co., Ltd. The company specializes in the R&D, manufacturing, and sales of hydraulic equipment.
Its hydraulic presses for forging and forming are used across industries such as defense manufacturing, automotive, home appliances, shipbuilding, chemical processing, furniture, and flooring.
The YB27 Series brings several of these considerations together: servo pump control for adjusting hydraulic output, an FEA-developed and stress-relieved frame, engineered hydraulic piping, displacement feedback, Siemens PLC control, and configurable automation and auxiliary equipment.
For an engineering or procurement team, these specifications provide a more meaningful basis for equipment comparison than tonnage alone. The real question is whether the press can deliver the required force and motion with stable forming conditions, controlled energy consumption, suitable automation, and reliable long-term operation.
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Changzhou Bailiyuan Energy-Saving Hydraulic Technology Co., Ltd.