1. The harm of laser cutting speed to laser cutting quality

The laser cutting speed is inversely proportional to the relative density (proportion) thickness of the raw material. When other main parameters remain unchanged, the factors to improve the laser cutting rate are: increasing the output power (within a certain range, such as 500 ~ 2000W); improving the light mode (such as advanced mode to higher order mode until TEM00); reducing the focus spot specification of sheet metal cutting machine (such as selecting short lens focus lens); laser cutting raw materials with low starting stopping volatile energy (such as plastic) Laser cutting of raw materials with low density (e.g. white cedar); laser cutting of thin raw materials.

2. The harm of focusing position adjustment on laser cutting quality

Because the laser power does great harm to the laser cutting rate, the selection of lens focal length is a key problem. The size of the light spot after focusing the particle beam is directly proportional to the focal length of the lens. After the light passes through the short focal length lens, the size of the light spot is large, the power at the focus is very high, which is very beneficial to the laser cutting of raw materials. However, its defect is that the relative aperture is very short the adjustment capacity is small, which is generally suitable for high-speed laser cutting thin raw materials. Because the long lens has a wide focal depth, if it has enough power, it is more suitable for laser cutting thick products.

The relative position between the focus the surface of the workpiece is very important to ensure the quality of laser cutting. Because of the high power at the focus point, in most cases, the focus position is just on the surface of the workpiece, slightly below the surface. In the whole process of laser cutting, ensuring the relative position of the focus the workpiece is the key standard to obtain stable laser cutting quality. Sometimes, when the lens is heated due to improper cooling, the focal length will be changed. Therefore, the focus position must be adjusted immediately.

When the focus is at the position, the slit is smaller the efficiency is higher. The laser cutting rate can get the result of laser cutting.

In most cases, the focus of light is adjusted to just under the nozzle. The distance between the nozzle the surface layer of the workpiece is generally 1.5mm.

3. The harm of auxiliary air pressure to laser cutting quality

In general, the type of auxiliary gas the application of auxiliary gas are involved. In general, the auxiliary vapor particle beam are coaxial output to protect the lens environmental pollution blow away the slag at the bottom of laser cutting zone. For non-metallic materials some metal composite materials, air compression rare gas is applied to solve the problem of melting volatilizing raw materials, to prevent excessive ignition in laser cutting area.

For most metal materials, the specific vapor (if it is O2) is used to produce air oxidation reaction with hot metal materials. These additional heat can increase the laser cutting rate by 1 / 3-1 / 2.

Under the premise of ensuring the auxiliary steam body, the air pressure size is an extremely important factor. When cutting thin raw materials with high speed laser, high air pressure must be used to avoid slag sticking on the opposite side of the wound (hot slag sticking to the product workpiece will continue to damage the cutting edge). When the thickness of raw materials increases the laser cutting speed is slow, the air pressure should be appropriately reduced to avoid frosting of plastic cutting edge, it is better to use lower air pressure laser cutting.

The practice of fiber laser cutting shows that when the auxiliary vapor is CO2, its purity has a significant harm to the quality of laser cutting. The reduction of CO2 purity by 2% will reduce the laser cutting rate by 50%, the wound quality will be significantly worse.

4. The harm of laser power to laser cutting quality

For the laser generator with continuous wave output, the size mode of laser output power are the key hazards to laser cutting. Get high output power when operating