CNC Turret Punch Press Product

Overview

A CNC turret punch press makes flat sheet-metal parts by punching: it drives hardened punches through the sheet into matching dies, hole by hole, hit by hit, until the programmed geometry exists. Unlike a laser it removes material mechanically, which keeps it competitive wherever parts are mostly holes, louvers, and standard cutouts — electrical enclosures, HVAC panels, server chassis, shelving. Its defining component is the Tool Turret: a pair of synchronized discs storing 20–58 complete tool sets, so the machine changes tools by rotating the turret rather than stopping to load them.

The sheet, not the tool, does the moving. The Sheet Positioning System system shuttles the clamped sheet beneath a fixed punching point at around 100 m/min, placing each programmed hit within ±0.1 mm.

How it works

Punching is shearing between a punch and a die separated by a clearance of roughly 10–20 % of sheet thickness per side. Each Tool Station packages a punch, spring stripper, and die in standardized station sizes (the Amada-originated A through E system, 12.7 to 114.3 mm maximum punch diameter). The upper disc (Upper Turret) guides the punch holders; the geared Lower Turret carries the dies in exact rotational synchronism, because a fraction of a degree of mismatch shears the punch against the die. When the program calls a tool, the Turret Drive spins both discs by the shortest path in about a second and hardened Turret Lock Pin bolts shot home before the first hit.

The blow comes from the Ram and Punch Drive. Current machines use a Servo Punch Drive through an eccentric or toggle Drive Linkage — hydraulics dominated until the 2000s, but servo drives idle at near-zero power and allow programmed ram motion. The Striker Head hits whichever punch holder sits at the punching position with 200–300 kN. Programmable Stroke Control is what turns the machine into more than a hole punch: stopping the ram short of full penetration enables forming tools (louvers, lances, countersinks, embossed stiffeners, tapped extrusions), engraving hits, and quiet "soft punch" cycles.

Large or curved contours are nibbled: the machine takes overlapping bites with a round or oblong punch at up to ~1,000 hits/min, leaving a scalloped edge whose pitch the programmer trades against cycle time. Auto-Index Station stations rotate a single rectangle or radius tool to any angle under servo control, collapsing what once required a dozen fixed-angle stations into one.

Sheet handling

Two or three pneumatic Sheet Clamp jaws grip the sheet edge from the moving Carriage Beam; the sheet rides on Brush Panel mats and Ball Transfer Insert elements so a 3-metre sheet can change direction multiple times per second without scratching. Each clamp shadows a dead zone the punch must never enter — the CNC maps these and the Clamp Sensor confirms grip continuously. When a part program needs area beyond the clamp travel, the Repositioning Cylinder pins the sheet while the clamps release, slide, and re-grip, extending the working range at the cost of a small repositioning tolerance.

Finished small parts drop through the Part Drop Chute trapdoor onto a conveyor; larger parts stay micro-tabbed in the skeleton for the operator to shake out. Slugs fall through the dies into the Slug Bin — slugs pulled back up by a worn punch are a classic defect, marked by dimpled sheet and broken tools.

Structure and accuracy

Every hit puts the full punching force through the Machine Frame. C-frames give open access but stretch measurably under load; bridge frames close the loop for better alignment at the cost of access. The machined Turret Mount Plates seats must hold the two turret axes coaxial within hundredths of a millimetre, since all punch-to-die clearance accuracy flows from that alignment. The hits also hammer the floor, hence elastomer Vibration Mounts under a 12–25 t machine.

Programming and economics

Parts are programmed in CAM nesting software, which lays multiple parts onto each sheet, assigns turret stations, sequences hits to minimize turret rotation and carriage travel, and posts G-code to the CNC Core. The cost structure favors the punch over the laser when tooling already exists and features repeat: each hit costs milliseconds and tool wear, and a formed louver is one hit versus an impossible laser feature. Against that, every new shape needs physical tooling, edge quality is scalloped on contours, and thick or reflective exotic work goes to the laser — which is why punch/laser combination machines occupy the top of the product line.