What is Slitting Machines and Why Do We Use Them?

Before mass-producing automotive panels, appliance housings, or furniture frames, the initial coiled rolls of steel, aluminum, or other metal alloys first pass through a vital processing stage — metal slitting. 

This continuous high-speed cutting process slices wide master sheet metal coils down to specific widths needed for fabricating anything from small electronics parts to tanker trailer sidewalls.

But how exactly do these heavy-duty industrial machines take thick, flawless 1,500 lb coils and perfectly slit them into numerous strips with tight tolerances? Find out as we break down metal slitting machines and the slitting process below!

WHAT ARE SLITTING MACHINES?

Metal slitting machines utilize hardened rotary knives to continuously cut or slit coiled material as it feeds through at high speeds. 

This is done by mounting circular slitting blades onto arbors oriented above and below the uncoiling metal strip. 

With extreme accuracy, the sharp circular knives rotate at surface feet per minute, optimized for clean shearing through steel, stainless steel, aluminum, and various metal alloys.

DIFFERENT TYPES OF SLITTING MACHINES

There are two primary types of slitting machines used in industrial metal manufacturing:

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• Roll Slitters: These versatile machines incorporate a series of upper and lower pairs of precisely adjustable circular slitting blades along arbors or shafts. This creates multiple regulated slits along the width of the continuously fed metal strip.
  
  
• Single/Double Slitter Re-winders:  Rather than numerous slitters, these incorporate 1-2 pairs mounted in lateral slitting heads. After initially slitting into a specific number of strips, the metal is flattened and recoiled.

Both designs offer optimal efficiency, flexibility, and functionality to transform coiled metal into desired widths and cut tolerances. Roll-slitting machinery can accommodate heavier gauges and widths over 80 inches. Meanwhile, slitter rewinders allow easier changeover between various slit widths.

THE PROCESS OF SLITTING METAL COILS

Feeding the coil strip through at a regulated speed is essential for precision cutting results. The basic process involves:

Throughout, operators monitor the process through HMI touchscreens and automated feedback that tracks necessary parameters like slit width/gauge dimensions, tension levels, recoil diameters, and production speed.

ADDITIONAL SLITTING MACHINE FEATURES

Beyond slitting heads housing rotating hardened steel knives, some common ancillary features include:

• Edge Trimming: Mounted knives on sides remove rough, flawed strip edges
• Surface Inspection: Rollers detect defects and signal marking devices to identify imperfect areas
• Recoilers: Take-up reels or tension stands wind slit strips to specified diameters

ADVANTAGES OF SLITTING MACHINES

There are significant benefits to incorporating slitting machinery in your manufacturing or pre-manufacturing processes, including:

• Cost Savings: Slitting is far faster and cheaper per pound versus cutting sheets or alternate saw methods requiring extensive labor, time, and blade costs.
• Customization: Precision rotary slitters produce coils in specialized widths tailored to customers’ roll forming and component size needs.
• Accuracy: Extremely tight width and edge tolerances enable the sheared metal to feed directly into precision stamping and machining tools.
• Finish Quality: Clean, smooth, razor-cut edges prevent distortion or saw teeth marks, permitting thinner gauges and improved corrosion resistance.

By providing such size/gauge flexibility, precision tolerance capabilities, effective waste reduction, and reliability improvements over other cutting methods, slitting systems deliver major throughput and quality gains.

SLITTING APPLICATIONS

Rotary slitting knives efficiently transform coiled steel, aluminum, stainless, and specialty alloys for various industrial and commercial uses, like:

• Transport: Cars, trailers, shipping containers
• Appliances: Washing machines, refrigeration
• Furniture: Desks, cabinets, displays
• Electronics: Casings, frames, parts
• Signage: Building wraps, billboards

Whether you need mass quantities of slit metal for automotive plants or specialty alloy rolls for aerospace composites, slitting machinery processes high-demand thickness/width specifications that would otherwise require extensive sawing, shearing, or manual cutting.

IN-HOUSE METAL SLITTING WHEN YOU ORDER FROM MEAD METALS