In the manufacturing of perforated products, 15 different grades of stainless steel are used, all of which are resistant to corrosion, rust, and bacterial growth. Each has a different finish: matte, satin, brushed, reflective, rough, or abrasive. A variety of shapes and patterns are punched into stainless steel to create complex and aesthetically pleasing patterns. Some of these shapes include round, square, oval, triangular, diamond, hexagonal, slot, and star-shaped holes.

Stainless steel sheets undergo perforation through two distinct methods, determined by the complexity of the design. The initiation of both processes occurs as the stainless steel sheets are introduced into the punching press:

For straightforward and repetitive patterns spanning the entire sheet, all-cross-perforated punching presses are employed. In this case, the thin stainless steel sheet is pierced by the rams of these steel sheet shaping machines, which are configured according to the specified pattern.

In contrast, for intricate, unique, and customized patterns and designs, a sectional two-axis punching press is utilized. In this process, aimed at creating non-repetitive holes, the sheet is maneuvered beneath a stationary punching ram, often accomplished through CNC machines.

 

In producing perforated steel sheets, thin, flat, cutable, bendable, shaped, or manufactured stainless steel sheets are the first step. Steel sheets are then measured in gauges, in which thinner steel sheets are indicated by the higher gauge number.

Choosing a Pattern

It is determined by the intended use of perforated steel sheets, which come in a variety of shapes, sizes, and hole arrangements, as well as standard and custom designs. Moreover, the strength, application, and hole configuration of the perforated steel sheets have a bearing on their functionality and effectiveness.

It is important to evaluate the size of the holes and bars when making a decision. There are voids in between the holes called bars. For a perforated steel sheet to function properly, the right balance of holes and bars must be achieved. As the number of holes increases, the bars become narrower. The thickness of the steel sheet should, at most, equal to the diameter of the holes or the width of the bars. This advice will prevent tool failure during processing.

 

 

All-across perforating presses are the top choice for making the most punches in a single hit. These presses can deliver up to 1600 punches per stroke, ensuring fast and accurate production. This perforation method is not only the quickest but also the most efficient and cost-effective. It is commonly employed in large projects that demand speed. The all-across technique can be used on materials with a thickness ranging from 0.002 inches to 0.25 inches, specifically on workpieces wider than 60 inches. With this method, thousands of holes can be created each minute, achieving an impressive rate of 600 strokes per second.

 

Press Punch XY Axis

The XY axis punch performs the same functions as a wide punch press, but it creates symmetrical holes section by section instead of repeating the same pattern again and again.

Laser Piercing

Laser perforation is the most accurate way to create perforated steel sheets. Using laser technology, complex geometries can be created with precise dimensions. It involves burning tiny holes repeatedly and precisely, leaving a strong ring around each incision. CO2 lasers and fiber lasers are available. Unlike fiber lasers, CO2 lasers use a gas-based laser instead of a powerful laser inserted in a specific optical fiber.

 

Plasma Puncturing

In plasma cutting, an electric arc is formed between a steel sheet’s surface and a gas shot from a nozzle. Plasma is heated by electric discharge to cut through steel sheets. In spite of the thickness of steel sheets, plasma can cut through them at a maximum speed of 20 meters per minute, regardless of the thickness.

Waterjet Cutting

Steel sheets can be cut into patterns using waterjet cutting, which uses water under high pressure. There are two types of waterjet cutting: one uses pure water without any additives, and the other adds grit to create an abrasive effect. The detailed designs on steel sheets are formed by blasting water through a nozzle. The waterjet-cutting delivery system includes robotic guiding to ensure accurate and precise cuts. This technique, known as cold-cutting, removes material from steel sheets by eroding it with water-soluble particles.

 

Nibbling Device

In the manufacturing process known as nibbling, steel sheets are repeatedly chopped with a punch. An electrohydraulic motor drives the nibbling machine to punch, cut, and shape materials accurately. In addition to punching, slot cutting, and creating rectangular patterns, nibbling machines perform a wide range of other tasks.

Leveling

As part of the perforation process, all gauges of stainless steel curl and need to be leveled. Several methods of leveling are available, including rolling machines and straightening presses. Although machines are available to complete the leveling process, manual methods are still used, but must be done by trained specialists.

Most stainless steel perforating manufacturers rely on leveling equipment to provide highly accurate tolerances in the shortest amount of time.

Value-Added Methods

The perforated stainless steel sheets can require additional processing or value-added procedures to enhance their quality or make them more suitable for their intended use. According to their capabilities and standards, stainless steel sheet perforation firms offer a range of value-added services, including welding and bending.

Welding

Among the most widely used filter tubes are perforated steel sheets. To create tubing, sheets of perforated steel sheets are rolled and welded together.

Bending

Different bends can be made to perforated steel sheets according to the application. Modern computer design software allows the desired angle to be created precisely and then replicated by a hydraulic machine. It is possible to bend perforated sheets to 120° angles by clamping them between higher and lower dies.

Powder Coating

Powder coating makes stainless steel stronger and more resistant by adding a thin layer of polymer. The process involves cleaning the stainless steel sheets, removing surface layers through passivation, and then blasting them. After that, a primer is applied, followed by the powder coating, which is applied using an electrostatic charge.