The key role of hydraulic press in cold forging process

Hydraulic press plays the role of core equipment in cold forging process. Its high precision, high stability and flexible control ability directly determine the quality, efficiency and economy of cold forging parts. The following is an analysis of the key role of hydraulic press in cold forging process for reference!

1. Providing stable high-pressure forming force

1.1 Wide coverage of high pressure range: Cold forging requires extremely high unit pressure (usually up to 1000~2500MPa), and hydraulic press can achieve 10,000 tons of pressure through multi-cylinder linkage or supercharger (such as automobile gears require 8000~12000 tons of pressure).

1.2 Precise pressure control: Real-time pressure adjustment through proportional valve or servo system to avoid dimensional deviation or mold damage caused by pressure fluctuations.

1.3 Pressure holding capacity: Hydraulic press can maintain constant pressure during the forming stage to ensure that the material fully fills the mold cavity (such as complex tooth forming).

2. Precise stroke and speed control

2.1 High position accuracy: The closed-loop control of the servo hydraulic press can achieve a repeatable positioning accuracy of ±0.01mm (such as cold forging of precision bearing rings).

2.2 Speed segment control:

2.2.1 Fast forward in idle stroke: Improve efficiency (200~500mm/s);

2.2.2 Slow feed: Reduce to 1~10mm/s in the precision forming stage to reduce sudden changes in material flow stress;

2.2.3 High return speed: Shorten cycle time.

3. Flexible ability to adapt to complex processes

3.1 Multi-action coordination: The hydraulic press can integrate auxiliary functions such as ejection, edge pressing, and multi-directional pressurization to meet:

3.1.1 Forward extrusion/reverse extrusion (such as hollow shaft parts);

3.1.2 Compound extrusion (such as the branch structure of automobile differential gears);

3.1.3 Radial forging (multi-directional synchronous pressure is required).

3.2 Flexible mold space: The open body design facilitates the installation of large mold frames or mold changing systems (such as fast mold changing technology that can shorten the mold changing time to minutes).

4. Solve the special challenges of cold forging process

4.1 High rigidity frame: resist elastic deformation during cold forging and ensure mold centering (C-frame hydraulic presses need to compensate for opening deformation, and four-column type is more stable).

4.2 Overload protection: The hydraulic system prevents pressure over-limit through overflow valves or sensors to protect the mold (such as sudden abnormal material hardness).

4.3 Shock absorption design: Cold forging has a large impact force, and the hydraulic press needs to be equipped with a buffer device or a shockproof foundation (such as vibration control during cold forging of automobile connecting rods).

5. Energy saving and intelligent upgrade

5.1 Servo hydraulic technology: Compared with traditional pump control systems, it saves 30%~50% energy and reduces no-load energy consumption by supplying oil on demand.

5.2 Process database: store pressure-displacement curves and optimize parameters (such as flow stress models for different materials).

5.3 Real-time monitoring:

5.3.1 Force-displacement monitoring: Detect insufficient material filling or folding defects;

5.3.2 Mold temperature sensing: Avoid local overheating and lubrication failure.

In short, the hydraulic press is the "heart" of the cold forging process, and its technical performance directly determines the accuracy, cost and production capacity of the product. In the future, with the progress of servo drive, intelligent sensing and material science, the hydraulic press will further enhance the limit of the cold forging process and promote the innovation of high-end parts manufacturing. When selecting a model, enterprises need to focus on the rigidity, control accuracy and scalability of the hydraulic press to meet the production needs of multiple varieties and high complexity. If you need high-quality hydraulic press manufacturing, please feel free to tell us (please scan the WhatsApp QR code below), Jianlong Hydraulic Technology will provide you with personalized, customized professional solutions and serve you wholeheartedly.