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Forged Tie Bar for Injection Machines

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    Forged Tie Bar for Injection Machines
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    Product Description

    High-Strength forged shaft for Heavy-Duty Injection Presses


    Forged tie bars are critical structural Machined Shafts used in heavy-duty injection molding machines. It connects the fixed and moving platens, ensuring precise alignment and high rigidity during high-pressure injection cycles. Manufactured using open-die forging combined with controlled Heat Treatment, these tie bars deliver superior strength, fatigue resistance, and long-term reliability compared to cast or bar-stock alternatives.

    Typical Applications

    • Heavy-duty injection molding machines
    • Industrial presses requiring high platen alignment and rigidity
    • High-load B2B manufacturing environments
    • Non-consumable Structural Components in extrusion or molding lines

    Typical Dimensions & Materials

    • Diameter: 120–400 mm
    • Length: 1500 – 4000 mm
    • Weight: 100–600 kg
    • Materials:
      • 42CrMo4 / AISI 4140 – Balanced strength and toughness
      • 34CrNiMo6 / AISI 4340 – Enhanced load capacity for fatigue-critical applications
      • Optional: 40CrNiMoA, 30CrNiMo8
    All dimensions are intentionally within our medium-to-large forging shaft capacity, avoiding small-size shafts that do not meet our production efficiency or inspection standards.
     
    Heavy-Duty Large-Tonnage Forged Tie Bar for Injection Machines
    Illustration for reference only. Final components are manufactured to exact project specifications for reliable operation.

    Manufacturing Process

    1. Open-Die Forging – Ensures aligned grain flow along the shaft for maximum structural integrity.
    2. Heat Treatment – Quenching and tempering balance toughness, hardness, and fatigue resistance.
    3. Rough Machining (Optional) – Produces reference surfaces, grooves, and ends for later assembly.
    4. Finish Machining (Optional) – Achieves precision tolerances: straightness and concentricity up to 0.01 mm.

    Mechanical & Functional Characteristics

    • High axial and bending strength
    • Excellent fatigue resistance under repetitive injection cycles
    • Maintains platen alignment under high-pressure operation
    • Designed for long-term structural reliability rather than short-term peak performance

    Inspection & Quality Control

    Each Forged Tie Bar is rigorously tested to ensure safety and durability in demanding injection equipment:
    • Chemical Composition: Verified via spectrometry
    • Mechanical Properties: Tensile strength and optional impact testing
    • Internal Soundness: Ultrasonic testing (UT / PAUT)
    • Dimensional Accuracy: Checked with CMM and conventional gauges
    • Traceability: Full heat number tracking from raw material to finished component
    For more details, see our Product Identification and Traceability page.

    Related Forged Products

    • Forged Injection Screw Shaft – High-strength shaft for screw rotation
    • Forged Clamping Ring – Ring for industrial shaft locking
    • Forged Pressure Cylinder / Load Frame Block – Heavy-duty structural block for press frames

    Why Choose Our Forged Tie Bars

    • Manufactured in-house for high reliability
    • Suitable for heavy-duty industrial injection equipment
    • Optimized grain flow and structural integrity via open-die forging
    • Fully inspected and traceable for quality assurance
     
    Related Forgings
     
     
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