Equipment Instructions

Here is a systematic, detailed introduction to the 400T four-column Hydraulic Press (400-ton, Four-column Hydraulic Press, typically the three-beam four-column configuration), including its structure, core parameters, working principle, key applications, major features, and typical models.

Basic Definition & Structure

Nominal force: 4000 kN (400 metric tons), one of the most widely used mid-to-large tonnage hydraulic presses.

Typical structure: Three-beam four-column (upper beam, moving beam/slider, workbench + four guide columns); some variants include four-beam designs. The columns provide rigid guidance to ensure uniform pressure and precise alignment during operation.

Core components: Main cylinder, hydraulic power unit (pumps, valves, oil tank), PLC+HMI control system, safety devices (light curtains, emergency stops, interlocks), optional ejector cylinder/hydraulic cushion.

Working Principle

The electric motor drives the hydraulic pump to generate high-pressure oil, which is distributed by cartridge valves/proportional valves.

High-pressure oil pushes the main cylinder piston to drive the moving beam down for pressing, with functions like pressure holding, time delay, and slow decompression to avoid hydraulic shock.

After the process, the valve reverses, the piston retracts, and the slide returns to the top position; optional ejector cylinder can push the workpiece out of the die.

Main Applications

Automotive industry: Stamping of body panels, forming of chassis components, press-fitting of bearings and bushings.

Metal processing: Deep drawing of sheets, bending, punching, blanking, correction/straightening of shafts/frames.

Composite & powder molding: SMC/BMC compression molding, carbon fiber part hot pressing, metal powder compaction.

General manufacturing: Plastic injection-compression, wood-based panel pressing, rubber vulcanization, non-ferrous metal forging.

Core Advantages

High stability: Four-column guiding ensures minimal deflection under full load, enabling precise forming with uniform pressure.

Flexible control: PLC+HMI allows for adjustable stroke/pressure, pressure-holding timing, and semi-automatic/fully automatic operation modes.

Strong customization: Stroke, table size, hydraulic cushion, heating platens, servo drive can all be tailored to process needs.

Safety features: CE-compliant light curtains, two-hand start buttons, anti-fall locks to protect operators.

Common Configurations & Suppliers

Standard vs. servo: Traditional variable pump systems are cost-effective; servo-hydraulic systems offer 30–50% energy savings, lower noise, and higher precision.

Suppliers: HARSLE, WORLD, WEILI, STANDARD, PrimaPress, with China-based manufacturers offering competitive pricing and customization capabilities.

Selection & Operational Tips

Confirm the required tonnage margin (typically 1.2–1.5× the process force), stroke, daylight, and table size based on the workpiece.

Choose the right hydraulic system and control mode (servo for high-precision/energy-saving needs).

Ensure regular maintenance of oil cleanliness, seal inspection, and guide lubrication to extend equipment life.