hot press cylinder model

2025-08-01 14:17:48

Low-pressure models: Rated pressure ≤16 MPa. These are used in light-duty hot presses, such as small wood veneer presses or paper product hot presses, where force requirements are moderate (≤500 kN).

Medium-pressure models: 16 MPa < rated pressure ≤31.5 MPa. The most common category, suitable for general industrial hot presses like those used in composite material lamination (glass fiber, carbon fiber) and plastic molding.

High-pressure models: 31.5 MPa < rated pressure ≤63 MPa. Designed for heavy-duty applications, including metal hot forging presses and thick plate welding presses, where force outputs exceed 2000 kN.

Ultra-high-pressure models: Rated pressure >63 MPa. Specialized for extreme scenarios like aerospace component hot forming, where precision and high force are critical.

Single-acting models: Hydraulic oil drives the piston in one direction (usually extending), with retraction relying on external forces (e.g., gravity, springs). Common in vertical hot presses where the upper platen descends under pressure and returns via its own weight. Model codes often include "S" (single-acting), e.g., HPS-200/100-500.

Double-acting models: Hydraulic oil controls both extension and retraction, offering faster response and precise control. Widely used in horizontal hot presses and automated production lines. Codes may include "D" (double-acting), e.g., HPD-315/160-800.

Telescopic models: Multi-stage nested cylinder design, allowing long strokes in limited space. Used in hot presses with large workpiece height variations, such as furniture panel presses. Codes often include "T" (telescopic), e.g., HPT-160/80-1200.

Plunger-type models: Features a solid plunger instead of a piston, designed for unidirectional force output with high stability. Common in large-tonnage hot presses like those for concrete slab pressing. Codes may include "P" (plunger), e.g., HPP-500/250-600.

Flange-mounted models: Equipped with flange plates at the cylinder ends for bolted fixation. Suitable for heavy-load hot presses where stability is prioritized, e.g., metal forging presses. Code suffix: "F" (flange), e.g., HPD-250/125-700F.

Trunnion-mounted models: Pivot points (trunnions) on the cylinder barrel allow angular movement, ideal for hot presses with tilting platens, such as automotive part hot presses. Code suffix: "T" (trunnion), e.g., HPS-200/100-600T.

Foot-mounted models: Base plates with mounting holes for vertical installation, common in small to medium hot presses like those for rubber vulcanization. Code suffix: "B" (base), e.g., HPD-160/80-500B.

Clevis-mounted models: Fork-shaped lugs at the rod end for pin connection, suitable for dynamic applications with slight alignment variations, such as textile dyeing hot presses. Code suffix: "C" (clevis), e.g., HPS-100/50-400C.

Standard temperature models: -20°C to 150°C. For general hot presses (e.g., woodworking, paper).

High-temperature models: 150°C to 300°C. Used in composite material and plastic hot presses.

Ultra-high-temperature models: 300°C to 500°C. Specialized for metal hot forging and ceramic sintering presses.

HP: Hot Press (product category)

D: Double-acting (structure)

31.5: Rated pressure (MPa)

200: Cylinder bore (mm)

1000: Stroke (mm)

H: High-temperature resistance (150–300°C)

Cylinder Bore (mm): The inner diameter of the cylinder barrel, directly affecting force output (Force = Pressure × Piston Area). Common bore sizes range from 50 mm (small models) to 800 mm (large forging presses).

Stroke (mm): The maximum distance the piston rod extends, determining the hot press platen’s movement range. Typical strokes: 300–5000 mm (specialized models can exceed 10,000 mm).

Rod Diameter (mm): The outer diameter of the piston rod, affecting stability (especially in long-stroke models). It is usually 0.6–0.8 times the cylinder bore (e.g., 200 mm bore → 120–160 mm rod).

Temperature Class: Encoded as "S" (standard, ≤150°C), "H" (high, 150–300°C), or "U" (ultra-high, >300°C), indicating the maximum ambient temperature the cylinder can withstand.

Material Code: Some manufacturers include material identifiers, e.g., "M" for 42CrMo cylinder barrel or "N" for nitrided 38CrMoAlA piston rod.

Model HPD-16/125-400S

Model HPD-25/200-800S

Model HPD-31.5/160-600H

Model HPD-31.5/250-1000H

Model HPP-50/300-500U

Model HPD-63/500-800U

Model HPD-25/100-300H

Model HPT-31.5/160-1500H

Model HPD-40/200-600U

Model HPD-63/300-800U

Limited vertical space → telescopic models (HPT series).

Angular movement needed → trunnion or clevis-mounted models.

Wood/plastic → standard temperature models (≤150°C) with nitrile rubber seals.

Composites/light metals → high-temperature models (150–300°C) with Viton seals.

Heavy metals → ultra-high-temperature models (>300°C) with metal-reinforced PTFE seals and ceramic-coated rods.

Low precision (woodworking) → standard models with ±0.5 mm stroke error.

High precision (aerospace) → models with linear encoders for ±0.05 mm accuracy, paired with servo valves for pressure control.

Maximum force and pressure (static/dynamic).

Stroke length and speed (extension/retraction).

Operating temperature and media (hydraulic oil type, contaminants).

Installation dimensions and mounting type.

Special features (e.g., position sensors, cooling jackets, or explosion-proof designs).

Structural stress under maximum pressure (to avoid deformation).

Thermal distribution (for high-temperature models, ensuring seals don’t overheat).

Dynamic stability (for long-stroke models, preventing rod bending).

Pressure test: 1.5× rated pressure for 1 hour (leak check).

High-temperature test: 24-hour operation at maximum temperature.

Fatigue test: 100,000+ pressure cycles to verify durability.

Model HPD-50/400-2000U-C (custom): 50 MPa, 400 mm bore, 2000 mm stroke, ultra-high temperature, with integrated cooling jacket and pressure sensor. Used in large aluminum alloy hot forming presses.

Model HPT-31.5/200-3000H-S (custom): Telescopic, 31.5 MPa, 2000 mm stroke, high temperature, with stainless steel components. Designed for marine composite panel presses in corrosive shipyard environments.

Regular Inspection: Check for leaks, rod scratches, or seal wear (monthly for standard use, weekly for high-temperature applications).

Fluid Maintenance: Use high-temperature hydraulic oil (e.g., ISO VG46) for H/U class models; filter oil to NAS 7 standard to prevent contamination.

Seal Replacement: Replace seals every 2,000–3,000 hours (sooner for high-temperature models) with manufacturer-recommended materials (Viton/PTFE).

Lubrication: Apply high-temperature grease (e.g., molybdenum disulfide) to rod guides to reduce friction.