Wood laser engraving machine is generally used for cutting and engraving of wood processing, wood material laser engraving form can be divided into cutting and engraving, concave mold engraving and convex mold engraving three. Laser engraving material removal principle is the same as laser cutting, multiple uncut grooves are connected together to form an area of material removal. Laser groove cross-section is "V" shape, the lower the cutting speed, the higher the laser current, the greater the groove width and depth, where the cutting speed and laser current on the groove depth than the groove width is much greater.
Chinese name wood laser engraving machine classification cutting engraving, cove engraving features lower cutting speed, the greater the laser current precautions when using please first connect the cooling water advantages than manual engraving more quickly, more exquisite
Concave die engraving
Convex die engraving
2. Notes on use
The basic principle of laser engraving processing of wood materials is basically the same as laser cutting processing, both of which use a high energy density laser beam to convert into heat energy, which instantaneously causes thermal decomposition and charring of wood, thus removing part of the material. Laser cutting is to separate different parts of the wood material (mainly panels), while laser engraving is to process the required patterns, designs and text on the surface of the wood material. For the same board, laser cutting requires more energy, while laser engraving requires less energy because it does not need to cut through the workpiece. Laser engraving is a non-contact processing method, compared with traditional mechanical processing methods have no wood pollution, no tool wear and no need to replace the tool, no noise pollution (very low noise) and other advantages. Laser cutting head focusing lens will focus the laser to a very small spot, spot diameter is generally 0.1 ~ 0.5 mm. laser beam focus is located near the surface to be processed, to melt or vaporize the material being processed. At the same time, the airflow coaxial to the beam is ejected from the cutting head, and the melted or vaporized material is blown out from the bottom of the incision.
According to the different processing methods of laser engraving of wood materials, laser engraving of wood materials can be divided into the following three categories.
It is to use the cutting method to process the required pattern on the surface of the wood material, i.e. firstly, the pattern is decomposed into a number of lines, and then the laser cuts out these lines to obtain the pattern expressed by the cut lines.
Concave die engraving
The part of the pattern is excised, while the outer part of the pattern is left as it is on the surface of the wood. Here is divided into two cases, the first case is the same excision strength for each point on the pattern, the carved pattern mainly relies on the contour shape to reflect; the second case is according to the distribution of the pattern of light and darkness, contrast, etc., on the pattern of the "dark" part of more excision, on the pattern of the "light "dark" part of the pattern, and the "light" part of the pattern is less excised or even not excised. The former is suitable for carving patterns such as text, animals, plants, etc., which are mainly expressed in appearance, while the latter is more suitable for carving patterns with details such as facial expressions of people.
Convex mold engraving
Contrary to the concave die engraving, this form of engraving process only removes the material at the periphery of the pattern, and the intensity of removal at each point is the same, while the material of the pattern itself is not removed. This engraving method is suitable for the expression of text, graphic outline, etc. The latter two engraving methods of material removal is the way, the laser head on the removal surface every time you walk, cut a linear groove, and then after a small distance of translation before the next line of cutting. Usually the distance between the two grooves can be O.05-0.5mm, so that through multiple linear grooves, the area of material removal required by the two forms of engraving can be achieved. Of course, in the second form of cavity die engraving, the size of the grooves, especially the depth of the grooves, will vary according to the need in the same cutting line.
Instructions for use
First, when using please first connect the cooling water, using the principle of low into high, adjust the position of the outlet pipe to ensure that the cooling water is full of cooling tube, the tube can not have vapor bubbles, and then turn on the power. Requirements: cooling water using soft water (distilled water or pure water), and often pay attention to the cooling water temperature, the water temperature should be controlled at 25 ℃ -30 ℃ range, not too high or too low, especially in summer, once the water temperature is found to be too high, the cooling water should be replaced in a timely manner or shut down for a period of time: the cooling water in cold areas shall not freeze, especially after the laser shutdown, do not let the cooling water stored in the laser tube, so as not to cooling water freezing leads to blow up. (Special attention: the use of AC power users, cooling water tank must be grounded).
Second, the two support points of the laser tube to be in the laser tube 1/4 of the total length of the point, to ensure that the flow of cooling water in 2L-4L / min; otherwise the effect is not good, will cause jumping mode, the spot becomes a few points leading to a drop in power; cooling water return port in the water tank must be covered by water, otherwise each time the laser tube off and on when the cooling water filled with the phenomenon.
Third, pay attention to the protection of the output window of the laser, to avoid the work process (including the debugging process of the optical path) generated by the smoke spattered on the surface of the output window, to prevent the outer surface of the output window is contaminated, the power will drop, then available skim cotton or silk cloth dipped in anhydrous alcohol gently wipe the outer surface of the output window.
Fourth, in the debugging process, by adjusting the laser support point or rotate the laser orientation to achieve the best output effect, and then the laser fixed
Fifth, please be sure to note: to avoid the accumulation of dust near the high-voltage electrode, to keep dry, the high-voltage end as far away from the metal as possible to prevent high-voltage firing discharge.
Sixth, the laser in the use of the process, can not have scale formed in the cooling tube, so as not to cause the cooling water blockage, the heat dissipation effect becomes worse. Once found, available 20% dilute hydrochloric acid cleaning cooling tube to remove the scale.
Seven, the laser is a glass product, fragile. Installation and use, avoid local stress.
Eight, the rationalization of the application of laser tube, save laser energy, laser tube operating current best point at 16 mA.