The generation and solution of burrs in the sheet metal processing of laser cutting machines

Sheet metal processing includes traditional cutting and blanking, punching, bending and pressing, and other methods and processes, which are widely used in machinery manufacturing, communications and electronics, automobiles and shipbuilding, aerospace and other industries. Metal laser cutting machines are used more frequently in the sheet metal processing industry. The finished product of laser processing has good effect and high processing efficiency. Many manufacturers in the sheet metal industry also have fiber laser cutting machines. However, for some reasons, many people have more feedback on the edges of products with burrs. Does this mean that it cannot adapt to sheet metal processing? In fact, it is not uncommon for laser cutting to have burrs. As long as the cause is found and properly solved, the appearance of burrs can be avoided.

How are burrs generated?

The burrs we are talking about are actually residual particles that appear in the cutting section of the laser high-temperature molten material. During the processing of the laser cutting machine, the laser generates a high-temperature and extremely fine laser beam for cutting through a three-in-one fusion. During the rapid vaporization and evaporation of the material, burrs will be generated at this time.

There are three reasons for the generation of specific burrs: equipment, gas, and parameters.

The first is equipment. This is a good understanding. If the equipment itself has quality problems when it leaves the factory, it is necessary to consider that unqualified products will be produced.

Next is gas. Most of the laser cutting process uses auxiliary gas. Some are adsorbed, some are easy to cut, and some are flame retardants. According to different materials, nitrogen and oxygen are usually used for metal cutting. That is to say, the effect of flame retardancy or combustion-supporting, in fact, there is no contradiction. Thicker materials are cut quickly with oxygen, and thinner materials or materials with impurities can be cut with flame-retardant gas. The premise is that the purity of the gas must be very high, otherwise the expected effect cannot be achieved.

Then set the parameters, and the parameters are not set correctly. This is well understood. Laser cutting is a process of coordination between various parts. These parameters are equivalent to commanders-if the parameters are not set correctly, where to hit is like a soldier without a general.

Therefore, when there are burrs on the laser cutting workpiece, it can be checked from several aspects:

1. The focus position of the laser cutting machine is deviated. The importance of the focus position is self-evident. Laser focusing has positive focus, zero focus and negative focus. If there is a position deviation during the cutting process, the energy cannot be concentrated in the setting. The position of the workpiece will be cut, otherwise the gap will be too large and burrs will be generated.

Solution： Refocus the laser beam and adjust it to normal state.

2. The power of the laser cutting machine is insufficient. If you want to cut a workpiece, the laser power is the first thing we need to consider. Usually there will be a decision when purchasing laser equipment. Usually there will be no shortage of laser power when purchasing.

Solution：If the laser output power is not enough, consider whether there is laser attenuation, keep the laser tube, or increase the laser tube power parameter adjustment to see if the cutting is normal.

3. The cutting speed of the laser cutting machine directly affects the cutting quality of the cutting machine. If the speed is too slow, burrs will be generated in the cutting part.

Solution： Adjust and increase the cutting line speed in time to make the cutting line speed reach the normal value.

4. The purity of the auxiliary gas of the laser cutting machine is not up to standard, which will cause problems.

Solution： Use high-purity auxiliary gas for cutting. If necessary, try more options.

5. The laser cutting machine also needs to rest. If the working time is too long, there will be a lack of sensitive response or laser attenuation, and burrs will appear.

Solution：Let the laser cutting machine stand for a while before processing. It is generally not recommended to work continuously for more than 5 hours, and the equipment can be shut down normally.

Metal laser cutting machine is a high-precision laser cutting equipment. During use under normal conditions, it can be checked according to the above method.

JUGAO CNC MACHINE's main products include laser cutting machines, CNC hydraulic bending machines, laser welding machines, shearing machines and pipe bending machines, etc., which are used in sheet metal processing, chassis cabinets, lighting, mobile phones, 3C, kitchenware, bathroom, auto parts machining and hardware industries.