Laser engraving, which is a subset of laser marking, is the concept of using lasers to engrave an object. Laser marking, on the contrary, is actually a broader group of methods to leave marks on an object, that also includes color change due to chemical/molecular alteration, charring, foaming, melting, ablation, and much more. The technique does not involve the use of inks, nor does 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 need to be replaced regularly.
The impact of Laser Metal Engraving Machine has been more pronounced for specifically created “laserable” materials and also for some paints. These include laser-sensitive polymers and novel metal alloys.
The term laser marking is also used being a generic term covering an extensive spectrum of surfacing techniques including printing, hot-branding and laser bonding. The machines for laser engraving and laser marking are the same, in order that the two terms are sometimes confused by those without knowledge or experience with the practice.
A laser engraving machine could be looked at as three main parts: a laser, a controller, along with a surface. The laser is sort of a pencil – the beam emitted from this allows the controller to trace patterns on the surface. The controller direction, intensity, speed of motion, and spread of the laser beam aimed at the top. The top is picked to complement just what the laser can act on.
You will find three main genres of engraving machines: The most frequent 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 attract vectors. Sometimes the laser is stationary and the workpiece moves. Sometimes the workpiece moves in the Y axis as well as the laser within the X axis. Another genre is perfect for cylindrical workpieces (or flat workpieces mounted around a cylinder) where the laser effectively traverses an excellent helix as well as on/off laser pulsing produces the desired image over a raster basis. Within the third method, both laser and workpiece are stationary and galvo mirrors move the laser beam within the workpiece surface. Laser engravers applying 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 surface ought to be on the focal plane in the laser’s optical system, and it is usually symbolic of its center point. This time is usually small, perhaps less than a fraction of any millimeter (depending on the optical wavelength). Only the area inside this focal point is significantly affected once the laser beam passes on the surface. The vitality delivered through the laser changes the surface of the material under the focal point. It could heat the surface and subsequently vaporize the content, or maybe the material may fracture (referred to as “glassing” or “glassing up”) and flake off of the surface. Cutting from the paint of a metal part is generally how material is Laser Cleaning Paint Removal.
If the surface material is vaporized during laser engraving, ventilation with the use of blowers or a vacuum pump are more often than not needed to remove the noxious fumes and smoke as a result of this process, as well as for removal of debris on the surface to allow the laser to carry on engraving.
A laser can remove material very efficiently because the laser beam could be made to deliver energy towards the surface in a manner which converts a high portion of the lighting energy into heat. The beam is highly focused and collimated – generally in most non-reflective materials like wood, plastics and enamel surfaces, the conversion of light energy to heat is much more than x% efficient. However, due to this efficiency, the equipment found in laser engraving may heat up quickly. Elaborate cooling systems are essential for the laser. Alternatively, the laser beam could be pulsed to reduce the amount of excessive heating.
Different patterns can be engraved by programming the controller to traverse a specific path for that laser beam over time. The trace of the laser beam is carefully regulated to attain a regular removal depth of material. For example, criss-crossed paths are avoided to ensure that each etched surface is exposed to the laser only once, therefore the equivalent amount of material is taken off. The pace at which the beam moves throughout the material is additionally considered in creating engraving patterns. Changing the intensity and spread in the beam allows more flexibility inside the design. As an example, by changing the proportion of your time (known as “duty-cycle”) the laser is excited during each pulse, the energy shipped to the engraving surface could be controlled appropriately for the material.
Since the positioning of the laser is well known exactly by the controller, it is not required to add barriers for the surface to prevent the laser from deviating through the prescribed engraving pattern. Consequently, no resistive mask is needed in laser engraving. This is primarily why this procedure is different from older engraving methods.
A great example of where laser engraving technology has been adopted in to the industry norm will be the production line. In this particular 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 merchandise traveling along a production line. Laser marking allows materials manufactured from plastic and glass to become marked “on the move”. The area in which the marking happens is known as “marking laser station”, an entity often seen in packaging and bottling plants. Older, slower technologies like hot stamping and pad printing have largely been eliminated and substituted for laser engraving.
For additional precise and visually decorative engravings, a laser table is utilized. A laser table (or “X-Y table”) is actually a sophisticated setup of equipment utilized to guide the laser beam more precisely. The laser is generally fixed permanently aside in the table and emits light towards a set of movable mirrors so that every reason for the table surface can be swept from the laser. At the point of engraving, the laser beam is focused by way of a lens in the engraving surface, allowing very precise and intricate patterns pmupgg be traced out.
A typical setup of a laser table requires the Yag Laser Marking Machine parallel to 1 axis in the table aimed at a mirror mounted on the end of an adjustable rail. The beam reflects off of the mirror angled at 45 degrees so that the laser travels a path exactly along the size of the rail. This beam will be reflected by another mirror mounted to some movable trolley which directs the beam perpendicular towards the original axis. Within this scheme, two degrees of freedom (one vertical, and something horizontal) for etching may 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
E-mail: [email protected]
Tel: (+86) 531-5557-2337