Automatic Rail Bottom Milling Machine

The Automatic Rail Bottom Milling Machine is an advanced solution developed to address the inefficiencies and risks of traditional manual grinding methods in rail welding and long rail laying operations. Powered by single-phase AC220V or a lithium battery system, the machine is driven by an AC motor and integrates precision engineering with intelligent control. Its design includes a milling unit, clamping mechanism, feed system, control box, and wireless remote controller, enabling operators to complete the milling of rail bottom welds automatically under PLC program control.

Background & Industry Challenge

In long rail installation, welding joints must be leveled at the rail bottom before further track-laying. Traditionally, this task has been carried out with handheld grinders, which are time-consuming, imprecise, labor-intensive, and unsafe, requiring frequent replacement of grinding wheels. On average, leveling one joint manually may take up to 20 minutes. With 6–8 weld joints occurring within a 2–3 km rail section (rail length ~500 m), these delays significantly impact productivity, especially under the strict time limits of railway construction “work windows.”

Our Solution

To overcome these challenges, our engineering team has developed the fully automatic rail bottom milling machine, achieving remarkable improvements in efficiency, precision, and safety:

• High Efficiency: Milling time per weld is reduced from 20 minutes to only 3 minutes, greatly accelerating long rail laying projects.
• Superior Quality: The milling process produces a smooth, flat surface with consistent accuracy, ensuring reliable weld performance.
• Enhanced Safety: Automatic operation reduces physical strain, minimizes exposure to sparks and dust, and eliminates risks associated with handheld grinders.
• User-Friendly Operation: Compact design, lightweight structure, and intuitive controls allow easy setup and operation, even in challenging field conditions.

Key Design Innovations

Built with aerospace-grade aluminum alloy, the frame maintains high structural strength while reducing overall weight to 25.5 kg, enabling frequent relocation with ease.

 2. Quick & Secure Clamping System

The unique hinge-and-spring clamping mechanism ensures reliable positioning and allows operators to mount or dismount the machine in under 30 seconds.

3. Dual Power Supply Options

Designed for maximum adaptability, the machine can switch between generator power (AC220V) and lithium battery supply, ensuring continuous operation under various site conditions.

4.Smart Control with Remote Monitoring

Equipped with a PLC-controlled system and wireless remote controller, the operator can observe the milling process in real time while managing operations remotely. This eliminates the need for constant manual observation and adjustment.

5.Fully Automated Workflow

Once initiated, the machine completes lifting, feeding, milling, and return cycles automatically, reducing labor intensity and preventing errors caused by manual handling.

Technical Specification 

• Weight: 25.5 kg 
• Dimensions: 575 × 320 × 210 mm 
• Cutter Head Diameter: 80 mm 
• Milling Inserts: 5 per cutter
• Rated Speed: 500 rpm
• Rated Power: 1.1 kW
• Operating Voltage: AC220V ±5%
• Operating Temperature: -20℃ ~ +50℃