Salvagnini P4 LEAN
Key Specifications
Accuracy
max panel size
min panel size
material thickness mild steel
material thickness stainless
material thickness aluminum
Overview
The Salvagnini P4 LEAN is an automatic panel bender from Italy's Salvagnini Group, designed for high-speed automated bending of sheet metal panels without operator intervention or tool changes. Salvagnini is the inventor and world leader in automatic panel bending, with panel benders installed in HVAC manufacturers, appliance producers, electrical enclosure fabricators, and sheet metal job shops worldwide.
The P4 LEAN is Salvagnini's entry-level automatic panel bender, providing the core panel bending automation in a compact, cost-effective package. It bends sheet metal panels up to 1,250 x 1,000 mm (49 x 39 in) with material thicknesses from 0.5 mm to 3.0 mm in mild steel, stainless steel, and aluminum. The automatic blade system makes all bends — up, down, and compound — without any tooling change, repositioning, or operator handling between bends.
The P4 LEAN's unique advantage is cycle time: a typical 6-bend panel that takes 60–90 seconds on a conventional press brake with manual handling takes 15–25 seconds on the P4 LEAN's automatic system. Over a production run of hundreds of identical panels, this productivity difference is transformative. Salvagnini's MAC2.0 adaptive bending system continuously measures and adjusts bending force to compensate for material spring-back variation, maintaining consistent bend angles across the production run.
The P4 LEAN competes with the Trumpf TruBend Center 5030 and the Bystronic Xpert 80 in the automatic panel bending segment, though the panel bender concept is distinctly Salvagnini's domain. Pricing typically runs $400,000–$700,000 depending on configuration.
Full Specifications
| Parameter | Value |
|---|---|
| Max Panel Size | 1,250 x 1,000 mm (49.2 x 39.4 in) |
| Min Panel Size | 100 x 100 mm (3.9 x 3.9 in) |
| Material Thickness Mild Steel | 0.5 - 3.0 mm (0.020 - 0.118 in) |
| Material Thickness Stainless | 0.5 - 2.0 mm |
| Material Thickness Aluminum | 0.5 - 3.0 mm |
| Max Bend Length | 1,250 mm (49.2 in) |
| Bending Force | Up to 1,000 kN (224,809 lb) |
| Tooling System | Universal blade (no tooling change required for up/down bends) |
| Bending Speed | Up to 150 mm/s |
| Positioning Accuracy | ±0.05 mm |
| Angle Accuracy | ±0.5 degrees (MAC2.0 adaptive compensation) |
| Machine Weight | 18,000 kg (39,683 lb) approximate |
| CNC Control | Salvagnini SN84 CNC with Salvagnini Suite software |
| Electrical | 400 VAC 3-phase 50 Hz |
Specifications sourced from salvagninigroup.com — verified 2026-03-28
Strengths & Limitations
Strengths
- Automatic bending without tool changes or panel repositioning reduces cycle time by 3–5x compared to conventional press brake production on typical panel geometries
- Universal blade system requires no setup for up/down bends — eliminates tool setup time and tooling inventory investment for different bend radii and flange heights
- MAC2.0 adaptive bending with continuous angle measurement eliminates spring-back variation — consistent angle accuracy batch to batch without operator adjustment
- Suitable for lights-out production of standard panel geometries — the P4 LEAN can run unattended once loaded, enabling one operator to manage multiple machines
- Salvagnini's 50+ years of panel bending leadership means the deepest installed base, most developed software (Salvagnini Suite), and well-understood process parameters
Limitations
- Maximum material thickness of 3.0 mm limits the P4 LEAN to thin-gauge sheet metal — heavy gauge steel (4+ mm) and plate work requires conventional press brakes
- Maximum panel size of 1,250 x 1,000 mm limits the machine to panels that fit this envelope — larger enclosure panels require larger Salvagnini models or conventional press brakes
- Price of $400K–$700K requires substantial production volume of standardized panel geometries to justify the capital investment over conventional press brakes
Best For
Frequently Asked Questions
01
A panel bender holds the sheet metal flat on a table surface using a blank holder (hold-down clamp) and makes bends by rotating bending blades above and below the panel edge — the panel doesn't move, the blades do. A press brake holds the sheet between upper punch and lower die, and the operator manually repositions the sheet between each bend. Panel benders are faster because: (1) no repositioning between bends — all bends are made automatically; (2) no tool changes — the universal blade makes both up and down bends; (3) no operator handling — no risk of marks from handling. Panel benders are optimized for box-and-pan style parts with multiple bends on the same edges; press brakes are more flexible for complex and unusual geometries.
02
MAC2.0 (Material Adaptive Control) is Salvagnini's patented system for automatic spring-back compensation in panel bending. Sheet metal spring-back (the partial return toward the original flat position after bending force is released) varies with each sheet's exact yield strength, thickness, and temper — even within the same material specification. MAC2.0 measures the actual bend angle in real time during the bending stroke and adjusts the bending stroke depth on the fly to achieve the specified angle despite spring-back variation. The result is consistent ±0.5 degree angle accuracy without manual correction, test bends, or operator adjustment — critical for batch production of standardized panels.
03
The P4 LEAN uses Salvagnini Suite software — Salvagnini's offline programming, nesting, and machine management platform. Salvagnini Suite accepts 3D part geometry from SolidWorks, Solid Edge, and other CAD systems and automatically generates the bending sequence and machine program. The software simulates the bending sequence to detect collisions between the panel and the machine before running on the actual machine. Salvagnini Suite integrates with ERP systems for production scheduling and batch management. The SN84 CNC on the machine executes the programs and provides real-time feedback on bend angle via MAC2.0.
04
The P4 LEAN can bend three-sided and four-sided open-top boxes, as well as panels with flanges on multiple sides. True closed boxes (sealed on all sides) cannot be produced because the blank holder must have access to the flat panel surface, and the bend blades require panel edge access. For deep boxes with flanges on all four sides, a combination of panel bending for the first sides plus press brake bending for the remaining sides is sometimes used. Salvagnini's application engineers can advise on feasibility for specific box geometries.
05
The ROI calculation for a P4 LEAN vs press brakes depends on production volume and part mix. A P4 LEAN producing 15–25 second cycles on standard panels replaces 2–3 conventional press brakes and operators for equivalent output on standardized part geometries. At 1,000 panels/day production, the labor and floor space savings typically provide a 3–5 year ROI at US labor rates. The calculation favors panel bending more strongly in high-labor-cost markets (Europe, North America) and for part families with standardized dimensions. For highly varied, low-volume job shop work, conventional press brakes remain more flexible and lower-risk.
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