How Patterns and Hole Shapes May influence the Uses of Perforated Metal

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In the realm of metals and fabrication, appearance can be almost everything. Perforating in some respects, is somewhat of an art. It has been manufactured using perforating presses for above a century. As times change, metal perforating evolves also. Some of the principles behind perforating remain constant, will have and always will, although some have progressed in keeping with advances in metallurgy and overall technology. Due to cnc programming and cad, non-traditional patterns have grown to be available opening the doors for unlimited possibilities including perforated logos and perforated images that resemble almost anything you can imagine. Overall, the perforated patterns have changed, the caliber of metals and alloys have improved, and the process of perforating metal has become much more efficient. But lets talk about the perforating patterns specifically.


Every perforated pattern obviously begins with the shape with the hole. Examples of hole shapes are circular, elliptical, oblong, oval, square, rectangular, hexagonal, octagonal, clover leaf, and triangular. Custom hole shapes are offered also by designing a custom perforating tool. Each hole shape brings its aesthetic characteristics. Design of the holes can impact the strength of the perforated material. For instance, holes can be perforated in a straight pattern with each and every hole in perfect line both horizontally and vertically about the metal sheet. Rows of holes may also be staggered which is common practice to keep strength in the finished product. The straight and staggered patterns create two entirely different appearances. In regards to strength however, a round hole perfed in to a staggered pattern creates the best overall strength versus open area. Round holes could be perfed more efficiently and economically than every other hole shape because the dies and punches required to punch a round hole will be the easiest and least expensive for make. Round hole tooling may also last longer and is easier to maintain. A round hole and staggered pattern is the most commonly commercially perforated pattern for only these reasons.

The outlet pattern actually includes a direction on a standard mass produced perforated metal supplier. Take notice of a perforated sheet using a staggered pattern and you will probably see that the stagger is usually on the short dimension of the sheet as well as the straight rows of holes will run parallel for the longer dimension. For hole size, the one to one rule has to be considered. Usually of thumb, when perforating mild steel and aluminum, the opening diameter needs to be at least the thickness with the raw material for reliable tool performance. When it comes to stainless steel in particular, metal thickness needs to be at least one gauge thinner compared to hole width for safer and more reliable production. About the punched patterns in metals another consideration is bar width, or perhaps the space between your holes. As with the hole diameter, a single to one ratio of space between holes is the absolute minimum with ease of production increasing width the width with the spacing. Open area is really a term used to describe the percentage of metal with holes as opposed to the solid, un-perforated metal. Outdoors area of the sheet will dictate many properties of the finished product including its appearance, needless to say, as well as its weight, its strength, being able to absorb heat, its sound absorbing capabilities, and how it can pass fluids.

Perforated patterns are carefully selected for their aesthetic appearance as well as their real world performance being a finished product. The mixture of hole sizes, hole shapes, and a variety of perforating techniques create a virtually endless number of perforated patterns to choose from.