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
Direct Drive Screw Press
Powered directly by a servo-controlled motor.
No flywheel or clutch.
Offers real-time feedback, energy efficiency, and quick reversing.
Servo Drive Screw Press
Utilizes a servo motor to control the rotation and stopping of the screw.
Equipped with encoder feedback and PLC control (typically Siemens or Mitsubishi).
Ensures repeatable forging, programmable stroke, and force monitoring.
🧱 Internal Assembly – Electric Screw Press
🔩 Top Section – Drive & Clutch Assembly
Screw: Main transmission shaft converting rotary motion to linear force.
Locking Nut for Screw: Secures the screw from backward play or loosening.
Top Side Clutch Liner: Friction surface that engages with the flywheel when pressure is applied.
Clutch Bolt & Spacer: Maintain the gap and provide secure clutch connection.
Clutch Hub & Clutch Hub Dowels: Transfers motor torque precisely; dowels ensure alignment.
Flywheel: Rotational energy storage (in traditional types; not used in true direct drive).
Roller Bearing: Reduces rotational friction, supports smooth operation.
🏗️ Mid Section – Load Transfer & Support
Pressure Plate: Applies force to engage clutch liner with flywheel.
Oil Catch Up Ring: Prevents leakage of lubricating oil, maintaining system cleanliness.
Bellows: Protect the spindle and inner parts from dust, debris, and oil splashes.
Neck Bearing: Radial bearing supporting axial motion of the screw shaft.
🛠️ Lower Section – Forging Force & Base Structure
Thrust Bearing: Takes the axial load during pressing, preventing shaft wear.
Body: Main machine housing structure, supports ram and guides alignment.
Ram: Moves downward under screw force to press the heated material.
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
