도매 유압 프레스 공급업체
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Hydraulic press types and configurations
Hydraulic press configurations and applications: C-frame (gap-frame) presses — single-frame design with C-shaped gap providing 3-sided access to the tooling area; available from 5–1,000 tonnes; suitable for punching, blanking, forming, assembly, and straightening operations; most common format for general workshop use; lower structural rigidity than closed-frame designs at equivalent tonnage; 4-column (pillar) presses — four vertical columns guide the moving upper platen; superior parallelism and rigidity versus C-frame; available from 10–10,000+ tonnes; widely used for deep drawing, rubber moulding, composite pressing, and SMC/BMC compression moulding; straightside (closed frame) presses — maximum rigidity from fully enclosed frame; preferred for precision blanking and close-tolerance forming; generally more expensive than 4-column designs; deep drawing presses — specialised hydraulic presses with blank holder force control for forming sheet metal cups, shells, and complex drawn parts; often equipped with die cushion (hydraulic or mechanical) for controlled blank holding pressure; hydroforming presses — internal high-pressure forming using fluid pressure to form sheet metal or tube against a die; used for complex structural parts in automotive (chassis rails, suspension components) and medical applications; and rubber/elastomer moulding presses — heated platens with temperature control for compression, transfer, and injection moulding of rubber components. Key technical specifications: maximum pressing force (tonnes), daylight opening (maximum distance between platens), stroke (platen travel), bed size (platen dimensions), approach speed, pressing speed, return speed, hydraulic system pressure (typically 200–320 bar), and control system type (manual, semi-automatic, PLC).
CE Machinery Directive and safety for hydraulic presses
Hydraulic presses are classified as Annex IV machinery under the EU Machinery Directive 2006/42/EC — meaning they require either: (a) certification by an EU-approved Notified Body (e.g. TÜV, BGIA, DGUV), or (b) manufacture in full conformity with harmonised standards covering all essential health and safety requirements. This is more stringent than the general Machinery Directive requirements for non-Annex IV machines. The key harmonised standards for hydraulic presses: EN 693 (machine tools — safety — hydraulic presses); EN ISO 13849 (safety of machinery — safety-related parts of control systems); EN ISO 13857 (safety distances for upper and lower limbs); EN 60204-1 (electrical equipment of machines — general requirements); and EN 574 (two-hand control devices). Critical safety functions: two-hand control devices preventing actuation unless both hands are on controls (EN 574 Type III C); light curtains (ESPE — electro-sensitive protective equipment) protecting the die space; hydraulic pressure relief valves preventing overload; and anti-fall protection for the ram (safety blocks or safety nuts preventing uncontrolled descent under gravity or hydraulic failure). For buyers procuring Chinese hydraulic presses for European deployment: insist on Notified Body certification (request the NB certificate and verify via the EU NANDO database), specify Pilz, SICK, or Schmersal safety components for safety-critical functions, and conduct FAT to verify all safety functions operate correctly before shipment.