Laser cutting

Technology that uses a laser to cut materials

For more Single-platform Fiber Laser Cutting Machineinformation, please contact us. We will provide professional answers.

Diagram of a laser cutter

Laser cutting process on a sheet of steel CAD (top) and stainless steel laser-cut part (bottom)

Laser cutting is a technology that uses a laser to vaporize materials, resulting in a cut edge. While typically used for industrial manufacturing applications, it is now used by schools, small businesses, architecture, and hobbyists. Laser cutting works by directing the output of a high-power laser most commonly through optics. The laser optics and CNC (computer numerical control) are used to direct the laser beam to the material. A commercial laser for cutting materials uses a motion control system to follow a CNC or G-code of the pattern to be cut onto the material. The focused laser beam is directed at the material, which then either melts, burns, vaporizes away, or is blown away by a jet of gas,[1] leaving an edge with a high-quality surface finish.[2]

History

[

edit

]

In , the first production laser cutting machine was used to drill holes in diamond dies. This machine was made by the Western Electric Engineering Research Center.[3] In , the British pioneered laser-assisted oxygen jet cutting for metals.[4] In the early s, this technology was put into production to cut titanium for aerospace applications. At the same time, CO2 lasers were adapted to cut non-metals, such as textiles, because, at the time, CO2 lasers were not powerful enough to overcome the thermal conductivity of metals.[5]

Process

[

edit

]

Industrial laser cutting of steel with cutting instructions programmed through the CNC interface

The laser beam is generally focused using a high-quality lens on the work zone. The quality of the beam has a direct impact on the focused spot size. The narrowest part of the focused beam is generally less than 0. inches (0.32 mm) in diameter. Depending upon the material thickness, kerf widths as small as 0.004 inches (0.10 mm) are possible.[6] In order to be able to start cutting from somewhere other than the edge, a pierce is done before every cut. Piercing usually involves a high-power pulsed laser beam which slowly makes a hole in the material, taking around 5&#;15 seconds for 0.5-inch-thick (13 mm) stainless steel, for example.

The parallel rays of coherent light from the laser source often fall in the range between 0.06&#;0.08 inches (1.5&#;2.0 mm) in diameter. This beam is normally focused and intensified by a lens or a mirror to a very small spot of about 0.001 inches (0.025 mm) to create a very intense laser beam. In order to achieve the smoothest possible finish during contour cutting, the direction of the beam polarization must be rotated as it goes around the periphery of a contoured workpiece. For sheet metal cutting, the focal length is usually 1.5&#;3 inches (38&#;76 mm).[7]

Advantages of laser cutting over mechanical cutting include easier work holding and reduced contamination of workpiece (since there is no cutting edge which can become contaminated by the material or contaminate the material). Precision may be better since the laser beam does not wear during the process. There is also a reduced chance of warping the material that is being cut, as laser systems have a small heat-affected zone.[8] Some materials are also very difficult or impossible to cut by more traditional means.

Laser cutting for metals has the advantage over plasma cutting of being more precise[9] and using less energy when cutting sheet metal; however, most industrial lasers cannot cut through the greater metal thickness that plasma can. Newer laser machines operating at higher power ( watts, as contrasted with early laser cutting machines' -watt ratings) are approaching plasma machines in their ability to cut through thick materials, but the capital cost of such machines is much higher than that of plasma cutting machines capable of cutting thick materials like steel plate.[10]

Types

[

edit

]

 watt CO2 laser cutter

There are three main types of lasers used in laser cutting. The CO2 laser is suited for cutting, boring, and engraving. The neodymium (Nd) and neodymium yttrium-aluminium-garnet (Nd:YAG) lasers are identical in style and differ only in the application. Nd is used for boring and where high energy but low repetition are required. The Nd:YAG laser is used where very high power is needed and for boring and engraving. Both CO2 and Nd/Nd:YAG lasers can be used for welding.[11]

CO2 lasers are commonly "pumped" by passing a current through the gas mix (DC-excited) or using radio frequency energy (RF-excited). The RF method is newer and has become more popular. Since DC designs require electrodes inside the cavity, they can encounter electrode erosion and plating of electrode material on glassware and optics. Since RF resonators have external electrodes they are not prone to those problems. CO2 lasers are used for the industrial cutting of many materials including titanium, stainless steel, mild steel, aluminium, plastic, wood, engineered wood, wax, fabrics, and paper. YAG lasers are primarily used for cutting and scribing metals and ceramics.[12]

In addition to the power source, the type of gas flow can affect performance as well. Common variants of CO2 lasers include fast axial flow, slow axial flow, transverse flow, and slab. In a fast axial flow resonator, the mixture of carbon dioxide, helium, and nitrogen is circulated at high velocity by a turbine or blower. Transverse flow lasers circulate the gas mix at a lower velocity, requiring a simpler blower. Slab or diffusion-cooled resonators have a static gas field that requires no pressurization or glassware, leading to savings on replacement turbines and glassware.

The laser generator and external optics (including the focus lens) require cooling. Depending on system size and configuration, waste heat may be transferred by a coolant or directly to air. Water is a commonly used coolant, usually circulated through a chiller or heat transfer system.

A laser microjet is a water-jet-guided laser in which a pulsed laser beam is coupled into a low-pressure water jet. This is used to perform laser cutting functions while using the water jet to guide the laser beam, much like an optical fiber, through total internal reflection. The advantages of this are that the water also removes debris and cools the material. Additional advantages over traditional "dry" laser cutting are high dicing speeds, parallel kerf, and omnidirectional cutting.[13]

Fiber lasers are a type of solid-state laser that is rapidly growing within the metal cutting industry. Unlike CO2, Fiber technology utilizes a solid gain medium, as opposed to a gas or liquid. The &#;seed laser&#; produces the laser beam and is then amplified within a glass fiber. With a wavelength of only nanometers fiber lasers produce an extremely small spot size (up to 100 times smaller compared to the CO2) making it ideal for cutting reflective metal material. This is one of the main advantages of Fiber compared to CO2.

Fibre laser cutter benefits include:

• Rapid processing times.
• Reduced energy consumption & bills &#; due to greater efficiency.
• Greater reliability and performance - no optics to adjust or align and no lamps to replace.
• Minimal maintenance.
• The ability to process highly reflective materials such as copper and brass.
• Higher productivity - lower operational costs offer a greater return on your investment.[14]

Methods

[

edit

]

There are many different methods of cutting using lasers, with different types used to cut different materials. Some of the methods are vaporization, melt and blow, melt blow and burn, thermal stress cracking, scribing, cold cutting, and burning stabilized laser cutting.

Vaporization cutting

[

edit

]

In vaporization cutting, the focused beam heats the surface of the material to a flashpoint and generates a keyhole. The keyhole leads to a sudden increase in absorptivity quickly deepening the hole. As the hole deepens and the material boils, vapor generated erodes the molten walls blowing ejection out and further enlarging the hole. Nonmelting materials such as wood, carbon, and thermoset plastics are usually cut by this method.

Melt and blow

[

edit

]

Melt and blow or fusion cutting uses high-pressure gas to blow molten material from the cutting area, greatly decreasing the power requirement. First, the material is heated to melting point then a gas jet blows the molten material out of the kerf avoiding the need to raise the temperature of the material any further. Materials cut with this process are usually metals.

Thermal stress cracking

[

edit

]

Brittle materials are particularly sensitive to thermal fracture, a feature exploited in thermal stress cracking. A beam is focused on the surface causing localized heating and thermal expansion. This results in a crack that can then be guided by moving the beam. The crack can be moved in order of m/s. It is usually used in the cutting of glass.

Stealth dicing of silicon wafers

[

edit

]

The separation of microelectronic chips as prepared in semiconductor device fabrication from silicon wafers may be performed by the so-called stealth dicing process, which operates with a pulsed Nd:YAG laser, the wavelength of which ( nm) is well adapted to the electronic band gap of silicon (1.11 eV or  nm).

Reactive cutting

[

edit

]

Reactive cutting is also called "burning stabilized laser gas cutting" and "flame cutting". Reactive cutting is like oxygen torch cutting but with a laser beam as the ignition source. Mostly used for cutting carbon steel in thicknesses over 1 mm. This process can be used to cut very thick steel plates with relatively little laser power.

Tolerances and surface finish

[

edit

]

Laser cutters have a positioning accuracy of 10 micrometers and repeatability of 5 micrometers.[citation needed]

Standard roughness Rz increases with the sheet thickness, but decreases with laser power and cutting speed. When cutting low carbon steel with laser power of 800 W, standard roughness Rz is 10 μm for sheet thickness of 1 mm, 20 μm for 3 mm, and 25 μm for 6 mm.

If you are looking for more details, kindly visit Single Table Fiber Laser Cutting Machine.

R z = 12.528 &#; S 0.542 P 0.528 &#; V 0.322 {\displaystyle Rz={\frac {12.528\cdot S^{0.542}}{P^{0.528}\cdot V^{0.322}}}}

Where: S = {\displaystyle S=} steel sheet thickness in mm; P = {\displaystyle P=} laser power in kW (some new laser cutters have laser power of 4 kW); V = {\displaystyle V=} cutting speed in meters per minute.[15]

This process is capable of holding quite close tolerances, often to within 0.001 inch (0.025 mm). Part geometry and the mechanical soundness of the machine have much to do with tolerance capabilities. The typical surface finish resulting from laser beam cutting may range from 125 to 250 micro-inches (0.003 mm to 0.006 mm).[11]

Machine configurations

[

edit

]

Dual-pallet flying optics laser Flying optics laser head

There are generally three different configurations of industrial laser cutting machines: moving material, hybrid, and flying optics systems. These refer to the way that the laser beam is moved over the material to be cut or processed. For all of these, the axes of motion are typically designated X and Y axis. If the cutting head may be controlled, it is designated as the Z-axis.

Moving material lasers have a stationary cutting head and move the material under it. This method provides a constant distance from the laser generator to the workpiece and a single point from which to remove cutting effluent. It requires fewer optics but requires moving the workpiece. This style of machine tends to have the fewest beam delivery optics but also tends to be the slowest.

Hybrid lasers provide a table that moves in one axis (usually the X-axis) and moves the head along the shorter (Y) axis. This results in a more constant beam delivery path length than a flying optic machine and may permit a simpler beam delivery system. This can result in reduced power loss in the delivery system and more capacity per watt than flying optics machines.

Flying optics lasers feature a stationary table and a cutting head (with a laser beam) that moves over the workpiece in both of the horizontal dimensions. Flying optics cutters keep the workpiece stationary during processing and often do not require material clamping. The moving mass is constant, so dynamics are not affected by varying the size of the workpiece. Flying optics machines are the fastest type, which is advantageous when cutting thinner workpieces.[16]

Flying optic machines must use some method to take into account the changing beam length from the near field (close to the resonator) cutting to the far field (far away from the resonator) cutting. Common methods for controlling this include collimation, adaptive optics, or the use of a constant beam length axis.

Five and six-axis machines also permit cutting formed workpieces. In addition, there are various methods of orienting the laser beam to a shaped workpiece, maintaining a proper focus distance and nozzle standoff.

Pulsing

[

edit

]

Pulsed lasers which provide a high-power burst of energy for a short period are very effective in some laser cutting processes, particularly for piercing, or when very small holes or very low cutting speeds are required, since if a constant laser beam were used, the heat could reach the point of melting the whole piece being cut.

Most industrial lasers have the ability to pulse or cut CW (continuous wave) under NC (numerical control) program control.

Double pulse lasers use a series of pulse pairs to improve material removal rate and hole quality. Essentially, the first pulse removes material from the surface and the second prevents the ejecta from adhering to the side of the hole or cut.[17]

Power consumption

[

edit

]

The main disadvantage of laser cutting is the high power consumption. Industrial laser efficiency may range from 5% to 45%.[18] The power consumption and efficiency of any particular laser will vary depending on output power and operating parameters. This will depend on the type of laser and how well the laser is matched to the work at hand. The amount of laser cutting power required, known as heat input, for a particular job depends on the material type, thickness, process (reactive/inert) used, and desired cutting rate.

Amount of heat input required for various materials at various thicknesses using a CO2 laser [watts][19] Material Material thickness 0.51 mm 1.0 mm 2.0 mm 3.2 mm 6.4 mm Stainless steel Aluminium Mild steel &#; 400 &#; 500 &#; Titanium 250 210 210 &#; &#; Plywood &#; &#; &#; &#; 650 Boron/epoxy &#; &#; &#; &#;

Production and cutting rates

[

edit

]

The maximum cutting rate (production rate) is limited by a number of factors including laser power, material thickness, process type (reactive or inert), and material properties. Common industrial systems (&#;1 kW) will cut carbon steel metal from 0.51 &#; 13 mm in thickness. For many purposes, a laser can be up to thirty times faster than standard sawing.[20]

Cutting rates using a CO2 laser [cm/second] Workpiece material Material thickness 0.51 mm 1.0 mm 2.0 mm 3.2 mm 6.4 mm 13 mm Stainless steel 42.3 23.28 13.76 7.83 3.4 0.76 Aluminium 33.87 14.82 6.35 4.23 1.69 1.27 Mild steel &#; 8.89 7.83 6.35 4.23 2.1 Titanium 12.7 12.7 4.23 3.4 2.5 1.7 Plywood &#; &#; &#; &#; 7.62 1.9 Boron / epoxy &#; &#; &#; 2.5 2.5 1.1

See also

[

edit

]

References

[

edit

]

Bibliography

[

edit

]

Laser cutting is now an extremely popular process for industrial industries such as engineering, architecture, medical, marine, and construction. The advanced machinery and technology used within laser cutting means it may appear to be a fairly modern technology, however, its roots go back to the mid 20th century. Here we look at the history of laser cutting and how fibre lasers came to be one of the most powerful, precise tools in the world.

When did laser cutting start?

While people often think laser cutting is a modern process, it isn&#;t necessarily a new concept. In fact, in laser technology celebrated its 60th anniversary!

The first pulsing laser prototype dates back to . Theodore Maiman made the first laser operate on 16th May at the Hughes Research Laboratory in California, by shining a high-power flash lamp on a ruby rod with a silver-coated surface.

In , the carbon dioxide laser was invented by Kumar Patel at Bell Labs, the most powerful continuously operating laser of its time.

The new discoveries of the laser beam caused a stir both within the scientific community and the general public. Newspapers portrayed the laser beams as &#;death rays&#; and people were unsure of this new, super technology. This fear was further promoted when Sean Connery was almost cut in half by a gold laser in a scene of the Bond film, Goldfinger.

When were lasers first used in production?

In came the first gas laser capable of continuous operation. A little closer to home in Cambridge, Peter Houldcroft used an oxygen assist gas to cut 1mm thick steel sheet with a focused CO2 laser beam.  He realised that the combination of a focused laser beam and an oxygen assist gas had the potential to improve the precision and speed of the laser machine.

The first laser designed for the purpose of production was introduced by Western Electric in , who used the machines to cut holes in diamond dies.

In August , the Boeing Company conducted research on CO2 laser cutting of &#;hard&#; materials. They concluded that the laser &#;could be an effective and economical cutting tool&#;. It was also around the early s, that oxygen laser cutting was used to cut through various materials including metal, something that carbon dioxide lasers originally hadn&#;t been capable of.

By the mid-s, Western Electric were producing laser-based cutting machines at a rapid rate.

The introduction of fibre lasers

There are two main types of laser machines &#; carbon dioxide and fibre. CO2 lasers are cheaper, but fibre laser cutting is more efficient and acts with more precision. It also uses a lot less energy in the process.

Since its invention in by Elias Snitzer, the fibre laser required 20 years of development before the first commercial devices appeared on the market in the late s.

The s was the golden age of laser cutting development. More high-powered lasers were on the market, with the ability to cut in large volumes. In the early s, fibre laser cutting was introduced to the commercial market.

The first fibre lasers for cutting reflective metals were introduced in . The different laser beam conveying methods allowed cutting metals like aluminium, brass, copper, and galvanised steel

The Introduction of Bystronic Bystar

The Bystronic ByStar Fiber 12kW is a fibre laser cutting technology that cuts even the thickest of metals with ease and handles large batches and high-volume jobs faster than ever before. This state-of-the-art Bystronic laser cutter, expertly handles thick and thin sheets and profiles, including mild steel, stainless steel, and aluminium up to a thickness of 30mm.

How Can We Help You with Your Next Project?

Laser 24 can laser cut a variety of metals and with our zero-handling process, this means that you receive the cleanest cut possible, without any manual handling damage. Our completely controlled automated process also means we are able to control the conditions under which it is cut, to produce the best quality parts for your projects. Combined with our press braking & finishing services, we can easily bend metals, grain, and de-burr.

We operate in several sectors including marine laser cutting, medical laser cutting, and laser projects for engineering. Thanks to our commitment to ongoing investment in world-leading machinery, we have the laser cutting & folding tools to deliver parts of exceptional quality at unbelievable prices, which is why we are one of the leading laser companies in the UK.

For more information on the services we provide across Essex, Kent, London, and surrounding areas, our capabilities, or to find out how we can help you with your next project, please call our team on 733 883 or [ protected] today.

Want more information on Fiber Laser Uncoiler Production Line? Feel free to contact us.