rounding the edges
Step-by-Step Edge Rounding
The cylinder enters horizontally between a female bottom roll and a male top roll held by narrow columns. The activated top roll presses downward, rounding the edges precisely to the target diameter.
pipe mills
MAV PPM
The Specialized Solution for Pipe Mills
Engineered to process high-strength materials (including mild steel, duplex, and superduplex alloys) up to 50 mm (2") in thickness over plate widths of 12 meters (40 ft), it stands as the technological choice for global pipe manufacturers.
Why MAV PPM?
Pre-Stressed.
Tightest Top Rolls.
Variable Geometry.
Rolls Crowning.
Bending Principle
Variable Axis 3-Roll Bending + Post-Bending
Material Compatibility
High-Yield Mild Steel, Duplex, Superduplex Alloys
Max Plate Width
Standardized up to 12,000 mm (40 ft)
Thickness Capacity
Up to 50 mm (2") for cold rolling applications
Deflection Control
Multiple Hydraulic Independent Back-up Rollers
Structural Design
Dominate the Pipeline Market.
Pre-Stressed
Out-Board Pre-Stressed Concept
The MAV PPM utilizes a press-roll configuration where the top roll moves vertically to press and form the plate, simulating the stroke of a press-brake "Ram" against two independent side rolls acting as a variable "V" die.
Tight Top Rolls
The Industry's Tightest Top Rolls
To achieve exceptionally tight internal diameters on long widths, the MAV PPM features an interchangeable top roll (ITR) assembly backed by a rigid supporting beam, enabling geometries impossible on standard machines.
Crowning
Multiple Hydraulic Backup Crowning
This special system allows operators to hydraulically adjust each anti-deflection back-up roll independently. It provides a "variable crowning" to optimize load distribution based on plate specifications, with positions easily memorized in the CNC.
Variable Geometry
Independent Variable Geometry
The two side rolls, along with their respective back-up structures, move horizontally and independently. This creates a variable gap width to maximize operational flexibility across a vast range of pipe diameters.
Completing the Workflow
The MPB Post Bender
In heavy-duty pipe manufacturing, eliminating flat ends is critical. The Davi MPB (Post Bender) is a dedicated machine engineered to perfect the edges of the shell left straight by the initial rolling process.
calibration step-by-step
Continuous Feed Calibration
Once clamped, the bottom roll rotates to feed the entire cylinder through, calibration step-by-step to achieve circular geometry across the entire length.
compliance
Heavy-Duty Capacity
The MPB range has the capacity to round extreme wall thicknesses (up to 42 mm (1.65") in heavy X80 material) ensuring compliance with strict international pipeline standards.
