Laser engraving, which is actually a subset of laser marking, is the technique of using lasers to engrave an object. Laser marking, on the contrary, is a broader category of ways to leave marks on an object, that also includes color change because of chemical/molecular alteration, charring, foaming, melting, ablation, and a lot 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 edge over alternative engraving or marking technologies where inks or bit heads have to be replaced regularly.
The impact of Laser Etching Engraving 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 phrase laser marking is additionally used as 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, so the two terms are sometimes confused by those without knowledge or experience with the practice.
A laser engraving machine can be regarded 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 onto the surface. The controller direction, intensity, speed of movement, and spread from the laser beam geared towards the surface. The surface is picked to fit exactly what the laser can act on.
You will find three main genres of engraving machines: The most frequent is definitely the X-Y table where, usually, the workpiece (surface) is stationary and the laser optics move around in X and Y directions, directing the laser beam to attract vectors. Sometimes the laser is stationary and also the workpiece moves. Sometimes the workpiece moves inside the Y axis and also the laser inside the X axis. An additional genre is made for cylindrical workpieces (or flat workpieces mounted around a cylinder) where the laser effectively traverses a great helix as well as on/off laser pulsing produces the required image on the raster basis. In the third method, both laser and workpiece are stationary and galvo mirrors move the laser beam over the workpiece surface. Laser engravers applying 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 surface should be on the focal plane from the laser’s optical system, and is also usually synonymous with its center point. This aspect is normally small, perhaps less than a fraction of a millimeter (depending on the optical wavelength). Merely 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 focal point. It might warm up the surface and subsequently vaporize the material, or perhaps the material may fracture (known as “glassing” or “glassing up”) and flake off of the surface. Cutting through the paint of a metal part is usually how material is Metal Sheet And Tube Laser Cutting.
In the event the surface material is vaporized during laser engraving, ventilation with the use of blowers or a vacuum pump are typically needed to take away the noxious fumes and smoke arising from this method, and for removal of debris on the surface to allow the laser to carry on engraving.
A laser can remove material very efficiently as the laser beam could be designed to deliver energy towards the surface in a manner which converts a high portion of the light energy into heat. The beam is highly focused and collimated – in many non-reflective materials like wood, plastics and enamel surfaces, the conversion of light energy to heat is a lot more than x% efficient. However, for this reason efficiency, the machine found in laser engraving may heat rather quickly. Elaborate cooling systems are required for that laser. Alternatively, the laser beam may be pulsed to reduce the volume of excessive heating.
Different patterns can be engraved by programming the controller to traverse a certain path for the laser beam as time passes. The trace of the laser beam is carefully regulated to achieve 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, and so the same amount of material is taken away. The pace where the beam moves throughout the material is also considered in creating engraving patterns. Changing the intensity and spread of the beam allows more flexibility within the design. For example, by changing the proportion of your time (known as “duty-cycle”) the laser is turned on during each pulse, the ability sent to the engraving surface could be controlled appropriately for the material.
Since the positioning of the laser is known exactly through the controller, it is far from necessary to add barriers to the surface to avoid 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 method differs from older engraving methods.
A great illustration of where laser engraving technologies have been adopted into the industry norm is definitely 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 might trace out numbers and letters on the surface being marked. This really is particularly useful 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 be marked “on the move”. The location in which the marking occurs 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 can be used. A laser table (or “X-Y table”) is actually a sophisticated setup of equipment used to guide the laser beam more precisely. The laser is usually fixed permanently to the side in the table and emits light towards a set of movable mirrors to ensure that every point of the table surface can be swept by the laser. At the point of engraving, the laser beam is focused through a lens in the engraving surface, allowing very precise and intricate patterns pmupgg be traced out.
An average setup of any laser table involves the Cnc Fiber Laser Machine Cutting parallel to one axis in the table aimed at a mirror mounted on the end of the adjustable rail. The beam reflects off the mirror angled at 45 degrees so the laser travels a path exactly along the size 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. Within this scheme, two levels of freedom (one vertical, and something 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
Tel: (+86) 531-5557-2337