Plate Rolls & Angle Rolls
Training & Guides

A 3-roll symmetric plate roll cannot pinch-roll the flat tail end, leaving an un-bent flat section at each end. A 3-roll asymmetric plate roll adds an adjustable side roll, reducing the flat tail significantly. A 4-roll plate roll has two bottom rolls and two side rolls — it can grip and roll both ends without removing the plate, leaving minimal flat tail and allowing precise rolling in a single pass. 4-roll machines are faster for production cylinders and deliver higher repeatability.

Pre-bending eliminates the flat section that symmetric rolls leave at the lead and trail edges. It requires rolling the first 100–200mm of each plate end before rolling the full cylinder. Pre-bending requires removing the plate, flipping it, pre-bending the other end, then rolling the full cylinder. 4-roll machines perform pre-bending automatically in a single setup — this is the main productivity advantage of the 4-roll configuration.

The minimum rolling diameter is typically 1.5–3× the top roll diameter, depending on material yield strength and thickness. Manufacturers publish a capacity chart specifying minimum diameter per material grade and thickness. For stainless steel, add 20–40% to the mild steel minimum diameter. Always confirm against the machine's official capacity chart — exceeding minimum diameter limits damages both the material and the roll crowns.

Yes. Cone rolling is performed on CNC plate rolls with independently adjustable roll positions — the top roll is tilted at an angle relative to the bottom rolls, creating a tapered gap that produces a conical frustum. The cone half-angle is programmed into the CNC controller. RollTek CNC plate rolls from Rise Tek support cone rolling via the controller. Manual cone rolling is also possible on mechanical rolls with skill and test pieces.

An angle roll can bend: angle iron (L-sections) in both easy-way and hard-way orientation; square and rectangular hollow sections; flat bar (on edge or flat); round bar; I-beams, H-beams, and channel (C-section); pipe and tube (round and square). Three-roll section benders with CNC radius control are used for curved architectural frames, railings, truck bodies, and structural ring fabrication.

Plate rolls can process mild steel, structural steel (Grade 350 CSA G40.21), stainless steel, aluminum, copper, and pre-painted steel. Material hardness and yield strength directly affect required tonnage and minimum rolling diameter — stainless steel requires 40–60% more force than mild steel of the same thickness. Hardox and abrasion-resistant steels require specialized high-tonnage rolls and manufacturer consultation.

Plate roll capacity is expressed as: maximum rolling length × maximum thickness for mild steel at a specified minimum diameter. Example: 2000mm × 12mm at Dmin 400mm for mild steel. For stainless steel, reduce the maximum thickness by 30–40%. For aluminum, increase maximum thickness by 20–30%. Always verify your job requirements against the machine's official capacity table — overloading a plate roll causes permanent crown deformation in the rolls.

Plate roll maintenance: (1) lubricate roll bearing housings and gear drives per schedule (typically monthly under production load); (2) check and adjust gear backlash annually; (3) inspect roll crowns for wear or deflection marks; (4) verify CNC position encoder calibration annually; (5) check hydraulic system oil and filter on hydraulic models every 2,000–3,000 hours. Clean scale and debris off the rolls after each shift to prevent surface marks on the next material.