Laser engraving, which is actually a subset of laser marking, is the practice of using lasers to engrave an object. Laser marking, on the contrary, is a broader class of methods to leave marks on an object, which also includes color change as a result of chemical/molecular alteration, charring, foaming, melting, ablation, and more. The procedure doesn’t involve using 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 must be replaced regularly.
The impact of Metal Cutting Laser continues to be more pronounced for specifically created “laserable” materials as well as for a few paints. Such as laser-sensitive polymers and novel metal alloys.
The phrase 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, so the two terms are occasionally confused by those without knowledge or experience with the practice.
A laser engraving machine could be regarded as three main parts: a laser, a controller, along with a surface. The laser is like 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 of the laser beam aimed at the outer lining. 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 definitely 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 in vectors. Sometimes the laser is stationary and also the workpiece moves. Sometimes the workpiece moves within the Y axis as well as the laser inside the X axis. Another genre is perfect for cylindrical workpieces (or flat workpieces mounted around a cylinder) in which the laser effectively traverses an excellent helix as well as on/off laser pulsing produces the desired image on the raster basis. In the third method, the laser and workpiece are stationary and galvo mirrors move the laser beam over the workpiece surface. Laser engravers applying 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 surface needs to be on the focal plane of the laser’s optical system, and it is usually symbolic of its center point. This time is typically small, perhaps under a fraction of a millimeter (depending on the optical wavelength). Merely the area inside this focal point is quite a bit affected if the laser beam passes within the surface. The power delivered through the laser changes the surface of the material under the focal point. It may heat up the outer lining and subsequently vaporize the material, or maybe the material may fracture (called “glassing” or “glassing up”) and flake from the surface. Cutting from the paint of the metal part is usually how material is Laser Clean Machine.
If the surface material is vaporized during laser engraving, ventilation by using blowers or a vacuum pump are almost always necessary to remove the noxious fumes and smoke as a result of this process, as well as for removing 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 made to deliver energy towards the surface in a manner which converts a high amount 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 much more than x% efficient. However, for this reason efficiency, the machine utilized in laser engraving may warm up quickly. Elaborate cooling systems are required for the laser. Alternatively, the laser beam might be pulsed to lower the volume of excessive heating.
Different patterns could be engraved by programming the controller to traverse a specific path for your laser beam with time. The trace of the laser beam is carefully regulated to attain a consistent removal depth of material. As an example, criss-crossed paths are avoided to ensure that each etched surface is subjected to the laser just once, therefore the equivalent amount of material is taken away. The pace in which the beam moves over the material is also considered in creating engraving patterns. Changing the intensity and spread in the beam allows more flexibility in the design. For example, by changing the proportion of your time (known as “duty-cycle”) the laser is switched on during each pulse, the energy shipped to the engraving surface could be controlled appropriately for the material.
Since the position of the laser is famous 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. Because of this, no resistive mask is required in laser engraving. This is primarily why this procedure differs from older engraving methods.
A good illustration of where laser engraving technologies have 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 may trace out numbers and letters to the surface being marked. This really is particularly helpful for printing dates, expiry codes, and lot numbering of items traveling along a production line. Laser marking allows materials made of plastic and glass to become marked “on the move”. The area where the marking happens is known as “marking laser station”, an entity often found in packaging and bottling plants. Older, slower technologies like hot stamping and pad printing have largely been phased out and replaced with laser engraving.
For additional precise and visually decorative engravings, a laser table is utilized. A laser table (or “X-Y table”) is a sophisticated setup of equipment employed to guide the laser beam more precisely. The laser is normally fixed permanently to the side of the table and emits light towards a pair of movable mirrors so that every point of the table surface can be swept through the laser. At the point of engraving, the laser beam is focused by way of a lens at the engraving surface, allowing very precise and intricate patterns pmupgg be traced out.
A normal setup of any laser table requires the Co2 Cutting Machine parallel to 1 axis from the table aimed at a mirror mounted on the end of the adjustable rail. The beam reflects from the mirror angled at 45 degrees so that the laser travels a path exactly along the duration of the rail. This beam will then be reflected by another mirror mounted to some movable trolley which directs the beam perpendicular for the original axis. In this particular scheme, two levels of freedom (one vertical, then 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