Laser engraving, which is a subset of laser marking, is the concept of using lasers to engrave an object. Laser marking, on the other hand, is actually a broader category of methods to leave marks on an object, which also includes color change because of chemical/molecular alteration, charring, foaming, melting, ablation, and a lot more. The technique doesn’t involve the use of inks, nor will 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 have to be replaced regularly.
The impact of Mopa Fiber Laser Marking continues to be more pronounced for specially designed “laserable” materials and also for many paints. Such as laser-sensitive polymers and novel metal alloys.
The term laser marking is also 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, in order that the two terms are often confused by those without knowledge or experience in the practice.
A laser engraving machine could be looked at 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 to the surface. The controller direction, intensity, speed of motion, and spread from the laser beam targeted at the surface. The outer lining is picked to complement exactly what the laser can act on.
You can find three main genres of engraving machines: The most typical is the X-Y table where, usually, the workpiece (surface) is stationary as well as the laser optics move about in X and Y directions, directing the laser beam to attract vectors. Sometimes the laser is stationary as well as the workpiece moves. Sometimes the workpiece moves in the Y axis as well as the laser within the X axis. A second 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 preferred image over a raster basis. In the third method, both the laser and workpiece are stationary and galvo mirrors move the laser beam on the workpiece surface. Laser engravers by using this technology can be employed 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 from the laser’s optical system, and it is usually symbolic of its centerpiece. This point is usually small, perhaps less than a fraction of a millimeter (depending on the optical wavelength). Only the area inside this focal point is quite a bit affected if the laser beam passes on the surface. The energy delivered by the laser changes the top of the material under the point of interest. It may warm up the outer lining and subsequently vaporize the material, or perhaps the material may fracture (called “glassing” or “glassing up”) and flake off the surface. Cutting with the paint of the metal part is usually how material is Fiber Laser Rotary Marking Machine.
If the surface material is vaporized during laser engraving, ventilation through the use of blowers or a vacuum pump are almost always necessary to remove the noxious fumes and smoke arising from this procedure, and for removing of debris on the surface to enable the laser to continue engraving.
A laser can remove material very efficiently as the laser beam can be designed to deliver energy for the surface in a manner which converts a higher portion of the sunshine energy into heat. The beam is highly focused and collimated – in most non-reflective materials like wood, plastics and enamel surfaces, the conversion of light energy to heat is more than x% efficient. However, due to this efficiency, the equipment utilized in laser engraving may heat quickly. Elaborate cooling systems are required for the 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 from the laser beam is carefully regulated to attain a regular removal depth of material. For example, criss-crossed paths are avoided to make sure that each etched surface is exposed to the laser only once, and so the same amount of material is taken off. The rate where 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 inside the design. For example, by changing the proportion of your time (known as “duty-cycle”) the laser is switched on during each pulse, the ability sent to the engraving surface may be controlled appropriately for that material.
Since the positioning of the laser is known exactly from the controller, it is really not essential to add barriers towards the surface to prevent the laser from deviating from the prescribed engraving pattern. Consequently, no resistive mask is necessary in laser engraving. This is primarily why this technique differs from older engraving methods.
A great demonstration of where laser engraving technologies have been adopted into the industry norm is 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 ideal for printing dates, expiry codes, and lot numbering of merchandise traveling along a production line. Laser marking allows materials made from plastic and glass to get marked “on the move”. The place where the marking happens is called a “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 further precise and visually decorative engravings, a laser table can be used. A laser table (or “X-Y table”) is actually a sophisticated setup of equipment employed to guide the laser beam more precisely. The laser is normally fixed permanently to the side from the table and emits light towards a pair of movable mirrors so that every point of the table surface could be swept by the laser. At the purpose of engraving, the laser beam is focused via a lens in the engraving surface, allowing very precise and intricate patterns pmupgg be traced out.
A normal setup of any laser table involves the Laser Fiber parallel to a single axis from the table geared towards a mirror mounted on the end of the adjustable rail. The beam reflects off of the mirror angled at 45 degrees so that the laser travels a path exactly along the duration 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. In this particular scheme, two levels 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