Laser engraving, that is a subset of laser marking, is the practice of using lasers to engrave an object. Laser marking, on the contrary, is a broader group of methods to leave marks on an object, that also includes color change as a result of chemical/molecular alteration, charring, foaming, melting, ablation, and a lot more. The technique doesn’t involve using inks, nor will it involve tool bits which contact the engraving surface and wear out, giving it an advantage over alternative engraving or marking technologies where inks or bit heads must be replaced regularly.
The impact of Laser Etching Systems has become more pronounced for specially engineered “laserable” materials and in addition for a few paints. These include laser-sensitive polymers and novel metal alloys.
The term laser marking is also used as a generic term covering a wide spectrum of surfacing techniques including printing, hot-branding and laser bonding. The machines for laser engraving and laser marking are the same, so the two terms are often confused by those without knowledge or expertise in the practice.
A laser engraving machine could be looked at as three main parts: a laser, a controller, as well as a surface. The laser is like a pencil – the beam emitted as a result allows the controller to trace patterns onto the surface. The controller direction, intensity, speed of movement, and spread from the laser beam targeted at the surface. The top is picked to match exactly what the laser can act on.
There are three main genres of engraving machines: The most common is the X-Y table where, usually, the workpiece (surface) is stationary as well as the laser optics move around in X and Y directions, directing the laser beam to draw vectors. Sometimes the laser is stationary as well as the workpiece moves. Sometimes the workpiece moves inside the Y axis as well as the laser within the X axis. An additional genre is perfect for cylindrical workpieces (or flat workpieces mounted around a cylinder) where laser effectively traverses an excellent helix and also on/off laser pulsing produces the desired image on the raster basis. Within the third method, the laser and workpiece are stationary and galvo mirrors move the laser beam on the workpiece surface. Laser engravers by using this technology can work in either raster or vector mode.
The point where the laser (the terms “laser” and “laser beam” can be utilized interchangeably) touches the top needs to be on the focal plane of the laser’s optical system, and it is usually synonymous with its focal point. This point is usually small, perhaps under a fraction of a millimeter (depending on the optical wavelength). Merely the area inside this center point is significantly affected when the laser beam passes over the surface. The vitality delivered through the laser changes the surface of the material under the focal point. It might heat the surface and subsequently vaporize the fabric, or maybe the material may fracture (called “glassing” or “glassing up”) and flake off of the surface. Cutting from the paint of a metal part is normally how material is 3d Photo Crystal Machine.
If the surface material is vaporized during laser engraving, ventilation with the use of blowers or a vacuum pump are almost always necessary to eliminate the noxious fumes and smoke arising from this process, and then for removing of debris on the surface to permit the laser to continue engraving.
A laser can remove material very efficiently since the laser beam can be made to deliver energy for the surface in a manner which converts a higher portion of the lighting energy into heat. The beam is extremely focused and collimated – generally in most non-reflective materials like wood, plastics and enamel surfaces, the conversion of light energy to heat is a lot more than x% efficient. However, due to this efficiency, the gear used in laser engraving may heat quickly. Elaborate cooling systems are required for that laser. Alternatively, the laser beam might be pulsed to decrease the quantity of excessive heating.
Different patterns could be engraved by programming the controller to traverse a specific path for the laser beam with time. The trace in the laser beam is carefully regulated to accomplish a consistent removal depth of material. For instance, criss-crossed paths are avoided to ensure that each etched surface is subjected to the laser only once, so the same amount of material is removed. The pace where the beam moves throughout the material can also be considered in creating engraving patterns. Changing the intensity and spread of the beam allows more flexibility within the design. As an example, by changing the proportion of time (known as “duty-cycle”) the laser is excited during each pulse, the energy delivered to the engraving surface can be controlled appropriately for that material.
Since the positioning of the laser is known exactly by the controller, it is not required to add barriers towards the surface to avoid the laser from deviating from your prescribed engraving pattern. As a result, no resistive mask is necessary in laser engraving. This is primarily why this technique is different from older engraving methods.
A great illustration of where laser engraving technology has been adopted in to the industry norm is the production line. In this setup, the laser beam is directed towards a rotating or vibrating mirror. The mirror moves in a manner which can trace out numbers and letters on the surface being marked. This is particularly helpful for printing dates, expiry codes, and lot numbering of items traveling along a production line. Laser marking allows materials made from plastic and glass to become marked “on the move”. The place in which the marking happens is known as “marking laser station”, an entity often found in packaging and bottling plants. Older, slower technologies such as hot stamping and pad printing have largely been eliminated and substituted with laser engraving.
For more precise and visually decorative engravings, a laser table can be used. A laser table (or “X-Y table”) is a sophisticated setup of equipment utilized to guide the laser beam more precisely. The laser is usually fixed permanently to the side of the table and emits light towards a set of movable mirrors to ensure that every reason for the table surface may be swept through the laser. At the point of engraving, the laser beam is focused through a lens at the engraving surface, allowing very precise and intricate patterns pmupgg be traced out.
A typical setup of a laser table necessitates the Steel Laser Cutter parallel to one axis from the table targeted at a mirror mounted on the end of your adjustable rail. The beam reflects off the mirror angled at 45 degrees so that the laser travels a path exactly along the length of the rail. This beam will be reflected by another mirror mounted to your movable trolley which directs the beam perpendicular towards the original axis. In this particular scheme, two levels of freedom (one vertical, and one horizontal) for etching can be represented.
Jinan MORN Technology Co., Ltd. (MORN GROUP) is a leading laser machine manufacturers and exporter in China. We are specialized in fiber laser cutting machine and fiber laser marking machine with 10 years experience.
Jinan MORN Technology CO., Ltd.
Address:13F, Building 5, Qisheng Mansion,Xinluo Street,High-Tech Zone, Jinan, China, 250101
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Tel: (+86) 531-5557-2337