Direct Drive Electric Screw Press – Assembly & Working Principle
🔍 What is an Electric Screw Press?
An Electric Screw Press is a forging machine driven by an electric motor that applies force through a rotating screw. It eliminates the need for mechanical flywheels or friction drives, ensuring high accuracy and control, ideal for hot, warm, and precision forging.
🌀 Types of Electric Screw Presses
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Direct Drive Screw Press
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Powered directly by a servo-controlled motor.
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No flywheel or clutch.
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Offers real-time feedback, energy efficiency, and quick reversing.
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Servo Drive Screw Press
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Utilizes a servo motor to control the rotation and stopping of the screw.
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Equipped with encoder feedback and PLC control (typically Siemens or Mitsubishi).
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Ensures repeatable forging, programmable stroke, and force monitoring.
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🧱 Internal Assembly – Electric Screw Press
🔩 Top Section – Drive & Clutch Assembly
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Screw: Main transmission shaft converting rotary motion to linear force.
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Locking Nut for Screw: Secures the screw from backward play or loosening.
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Top Side Clutch Liner: Friction surface that engages with the flywheel when pressure is applied.
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Clutch Bolt & Spacer: Maintain the gap and provide secure clutch connection.
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Clutch Hub & Clutch Hub Dowels: Transfers motor torque precisely; dowels ensure alignment.
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Flywheel: Rotational energy storage (in traditional types; not used in true direct drive).
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Roller Bearing: Reduces rotational friction, supports smooth operation.
🏗️ Mid Section – Load Transfer & Support
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Pressure Plate: Applies force to engage clutch liner with flywheel.
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Oil Catch Up Ring: Prevents leakage of lubricating oil, maintaining system cleanliness.
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Bellows: Protect the spindle and inner parts from dust, debris, and oil splashes.
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Neck Bearing: Radial bearing supporting axial motion of the screw shaft.
🛠️ Lower Section – Forging Force & Base Structure
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Thrust Bearing: Takes the axial load during pressing, preventing shaft wear.
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Body: Main machine housing structure, supports ram and guides alignment.
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Ram: Moves downward under screw force to press the heated material.
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Forging Die (not shown): Mounted on ram to form the metal workpiece.
⚡️ Advantages of Direct Drive / Servo Electric Screw Press
| Feature | Benefit |
|---|---|
| 🔄 Reversible Motion | Quick up/down stroke for flashless forging |
| 🎯 Programmable Control | Force, stroke, and position accuracy |
| 🔋 Energy Efficiency | No flywheel, minimal idle loss |
| 🛠️ Low Maintenance | Fewer mechanical parts, less wear |
| 🧠 Intelligent Feedback | Closed-loop system using encoders and sensors |
Key Applications of Electric Screw Press in Modern Forging
