Laser engraving, which is a subset of laser marking, is the technique of using lasers to engrave an object. Laser marking, on the other hand, is actually a broader group of ways to leave marks on an object, that also includes color change as a result of chemical/molecular alteration, charring, foaming, melting, ablation, and a lot more. The process does not involve the usage 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 Engraving Metal Machine has been more pronounced for specially engineered “laserable” materials and in addition for some paints. Included in this are laser-sensitive polymers and novel metal alloys.
The term laser marking can also be used being a generic term covering a broad spectrum of surfacing techniques including printing, hot-branding and laser bonding. The machines for laser engraving and laser marking are similar, so that the two terms are often confused by those without knowledge or experience in 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 to the surface. The controller direction, intensity, speed of motion, and spread of the laser beam targeted at the top. The outer lining is picked to complement exactly what the laser can act on.
There are three main genres of engraving machines: The most common will be the X-Y table where, usually, the workpiece (surface) is stationary and also the laser optics maneuver 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 in the Y axis and the laser within the X axis. Another genre is made for cylindrical workpieces (or flat workpieces mounted around a cylinder) where the laser effectively traverses a great helix and on/off laser pulsing produces the desired image on the raster basis. In the third method, both the laser and workpiece are stationary and galvo mirrors move the laser beam within 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” may be used interchangeably) touches the top needs to be on the focal plane in the laser’s optical system, and it is usually symbolic of its focal point. This point is typically small, perhaps less than a fraction of any millimeter (depending on the optical wavelength). Only the area inside this centerpiece is quite a bit affected if the laser beam passes over the surface. The energy delivered from the laser changes the surface of the material under the point of interest. It might heat the surface and subsequently vaporize the fabric, or perhaps the material may fracture (referred to as “glassing” or “glassing up”) and flake from the surface. Cutting through the paint of a metal part is generally how material is Memory Card Making Machine.
If the surface material is vaporized during laser engraving, ventilation through the use of blowers or perhaps a vacuum pump are almost always necessary to take away the noxious fumes and smoke as a result of this process, as well as for removing of debris on the surface to permit the laser to carry on 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 high percentage of the light energy into heat. The beam is extremely 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, because of this efficiency, the equipment found in laser engraving may warm up quickly. Elaborate cooling systems are essential for your laser. Alternatively, the laser beam may be pulsed to reduce the volume of excessive heating.
Different patterns could be engraved by programming the controller to traverse a certain path for that laser beam as time passes. The trace in the laser beam is carefully regulated to attain a consistent removal depth of material. For instance, criss-crossed paths are avoided to make sure that each etched surface is in contact with the laser only once, therefore the same amount of material is removed. The pace where the beam moves across the material can also be considered in creating engraving patterns. Changing the intensity and spread from the beam allows more flexibility inside the design. As an example, by changing the proportion of energy (called “duty-cycle”) the laser is excited during each pulse, the power shipped to the engraving surface could be controlled appropriately for that material.
Since the positioning of the laser is well known exactly from the controller, it is really not essential to add barriers to the surface to avoid the laser from deviating from the prescribed engraving pattern. As a result, no resistive mask is necessary in laser engraving. This can be primarily why this method differs from older engraving methods.
A good example of where laser engraving technologies have been adopted into 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 might trace out numbers and letters onto the surface being marked. This can be particularly helpful for printing dates, expiry codes, and lot numbering of products traveling along a production line. Laser marking allows materials made from plastic and glass to become marked “on the move”. The area where marking takes place is known as “marking laser station”, an entity often present in packaging and bottling plants. Older, slower technologies such as hot stamping and pad printing have largely been eliminated and replaced with laser engraving.
For additional precise and visually decorative engravings, a laser table is used. A laser table (or “X-Y table”) is a sophisticated setup of equipment used to guide the laser beam more precisely. The laser is generally fixed permanently to the side of the table and emits light towards a pair of movable mirrors in order that every reason for the table surface can be swept through the laser. At the aim 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 necessitates the High Quality Laser Cutter parallel to one axis from the table aimed at a mirror mounted on the end of your adjustable rail. The beam reflects off the mirror angled at 45 degrees in order that the laser travels a path exactly along the duration of the rail. This beam is then reflected by another mirror mounted to a movable trolley which directs the beam perpendicular to the original axis. Within this scheme, two degrees of freedom (one vertical, and one 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
E-mail: [email protected]
Tel: (+86) 531-5557-2337