Laser engraving, which is a subset of laser marking, is the practice of using lasers to engrave an object. Laser marking, on the other hand, is actually a broader category of ways to leave marks on an object, which also includes color change due to chemical/molecular alteration, charring, foaming, melting, ablation, and much more. The technique doesn’t involve the use of inks, nor does it involve tool bits which contact the engraving surface and wear out, giving it an edge over alternative engraving or marking technologies where inks or bit heads need to be replaced regularly.
The impact of Laser Marker continues to be more pronounced for specifically created “laserable” materials and in addition for some paints. Such as laser-sensitive polymers and novel metal alloys.
The phrase laser marking can also be used as 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 similar, so the two terms are sometimes confused by those without knowledge or experience with the practice.
A laser engraving machine can be thought of as three main parts: a laser, a controller, and a surface. The laser is like a pencil – the beam emitted from it allows the controller to trace patterns onto the surface. The controller direction, intensity, speed of movement, and spread from the laser beam aimed at the outer lining. The top is picked to complement just what the laser can act on.
You can find three main genres of engraving machines: The most frequent will be the X-Y table where, usually, the workpiece (surface) is stationary and also 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 and also the laser in the X axis. An additional genre is for cylindrical workpieces (or flat workpieces mounted around a cylinder) where laser effectively traverses a fine helix as well as on/off laser pulsing produces the required image on the raster basis. In 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 stage where the laser (the terms “laser” and “laser beam” can be utilized interchangeably) touches the top should be on the focal plane in the laser’s optical system, and is also usually symbolic of its center point. This point is usually small, perhaps less than a fraction of a millimeter (depending on the optical wavelength). Only the area inside this center point is quite a bit affected once the laser beam passes on the surface. The power delivered from the laser changes the surface of the material under the point of interest. It might heat the top and subsequently vaporize the content, or perhaps the material may fracture (referred to as “glassing” or “glassing up”) and flake from the surface. Cutting from the paint of a metal part is generally how material is Metal Marking.
In the event the surface material is vaporized during laser engraving, ventilation with the use of blowers or even a vacuum pump are typically necessary to remove the noxious fumes and smoke arising from this process, and for removing of debris on the surface to permit the laser to carry on engraving.
A laser can remove material very efficiently because the laser beam may be designed to deliver energy towards the surface in a manner which converts a higher portion of the sunshine energy into heat. The beam is very focused and collimated – 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, for this reason efficiency, the gear found in laser engraving may heat up rather quickly. Elaborate cooling systems are essential for the laser. Alternatively, the laser beam may be pulsed to lower the amount of excessive heating.
Different patterns may be engraved by programming the controller to traverse a particular path for that laser beam over time. The trace from the laser beam is carefully regulated to attain a consistent removal depth of material. For example, criss-crossed paths are avoided to make sure that each etched surface is in contact with the laser only once, so the equivalent amount of material is taken off. The rate at which the beam moves over the material can also be considered in creating engraving patterns. Changing the intensity and spread from the beam allows more flexibility in the design. As an example, by changing the proportion of energy (referred to as “duty-cycle”) the laser is switched on during each pulse, the power shipped to the engraving surface can be controlled appropriately for your material.
Since the positioning of the laser is well known exactly from the controller, it is far from required to add barriers to the surface to prevent the laser from deviating from the prescribed engraving pattern. As a result, no resistive mask is required in laser engraving. This really is primarily why this procedure is different from older engraving methods.
An excellent demonstration of where laser engraving technologies have been adopted to the industry norm is definitely the production line. In this setup, the laser beam is directed towards a rotating or vibrating mirror. The mirror moves in a manner which might trace out numbers and letters on the surface being marked. This really is particularly ideal for printing dates, expiry codes, and lot numbering of merchandise traveling along a production line. Laser marking allows materials made of plastic and glass to become marked “on the move”. The location in which the marking takes place is known as “marking laser station”, an entity often seen in packaging and bottling plants. Older, slower technologies such as hot stamping and pad printing have largely been phased out and replaced with laser engraving.
For more precise and visually decorative engravings, a laser table can be used. A laser table (or “X-Y table”) is really a sophisticated setup of equipment used to guide the laser beam more precisely. The laser is usually fixed permanently aside from the table and emits light towards a set of movable mirrors to ensure that every reason for the table surface can be swept by the laser. At the purpose of engraving, the laser beam is focused via a lens on the engraving surface, allowing very precise and intricate patterns pmupgg be traced out.
A typical setup of the laser table necessitates the Steel Fiber Laser Cutter parallel to 1 axis of the table targeted at a mirror mounted on the end of your adjustable rail. The beam reflects from the mirror angled at 45 degrees in order that the laser travels a path exactly along the length of the rail. This beam will be reflected by another mirror mounted to a movable trolley which directs the beam perpendicular for the original axis. In this scheme, two degrees of freedom (one vertical, and one horizontal) for etching could 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