Views: 27 Author: DURMAPRESS Publish Time: 2021-01-27 Origin: DURMAPRESS
More and more sheet metal processing companies have begun to use cnc fiber laser cutting machine to cut round holes because of the flexibility and efficiency of laser processing methods. In addition, the cross-section of the circular hole processed by the laser is smoother, and the diameter of the circular hole can also be infinitely modified to meet the diverse needs of the factory.
However, machining round holes with a metal fiber laser cutting machine is not very simple, but requires some skill. Let the laser engineers analyze the reasons and precautions for cutting round holes.
The blowing pressure is not suitable
During the blowing process, when the air pressure is too low, slag scraping and carbonization will occur at the edges, and the pressure is too high and it is easy to burst holes. Therefore, this requires the perfect cooperation between the craftsman and the machine to choose the right air pressure based on experience to make the cut round hole more full.
The hole is too small
The best solution for the cnc fiber laser metal cutting machine to cut round holes is the round hole ratio 1:1, which means that the ratio of the aperture to the plate thickness is 1:1. Of course, this ratio, that is to say, the larger the aperture, the higher the quality of the circle. Hole is easier. Otherwise, when the energy of the fiber laser cutting machine is insufficient, the small holes will be easily cut and the broken points will remain and the round holes will not be round.
The servo motor parameters are wrong
The circular hole sometimes appears elliptical or irregular. This is related to the X\Y axis movement mismatch, and the direct cause of the X\Y axis movement mismatch is that the servo motor parameters are not adjusted properly. Therefore, the quality of cutting round holes also has certain requirements for the servo motor.
The precision error of the guide rail and the screw lead to
If the parameter error of the servo motor affects the cutting quality, the accuracy error of the guide rail and the lead screw will directly lead to the accuracy of the round hole not reaching the expected. This is related to the strength of the laser cutting machine manufacturer. Usually, some small factories will trick customers into saying that the accuracy of the laser cutting machine can reach 0.1mm, but in fact, in the actual operation process, the quality and effect of laser drilling will be poor. Good, affect the added value of the product. Therefore, it is very necessary to choose high-quality and large-brand laser cutting machines.
All these parameters are used to identify whether the precision, speed and other parameters of cutting round holes meet the standard requirements, and they are sufficient to identify whether the quality of the laser cutting machine purchased is satisfactory. Therefore, you must keep your eyes open when buying a laser cutting machine.
Compared with other types of cutting, laser cutting has many advantages, mainly including the following:
♦Higher cutting precision and accuracy
♦Higher quality edges
♦Narrow cut width
♦Smaller heat affected zone and less material deformation
♦Reduce material pollution and waste
♦Reduce maintenance cost
♦Higher operational safety
Compared with traditional cutting machines, laser cutting machines can cut a variety of designs with higher precision and accuracy. Since laser cutting machines can be fully controlled by CNC, they can repeatedly and consistently produce complex parts with high tolerances. Laser cutting can also produce high-quality cuts and edges, usually without further cleaning, processing or finishing, thereby reducing the need for other finishing processes.
The focused beam achieves a narrower cut width, while local heating allows minimal heat input to most materials to be cut. Smaller cuts minimize the amount of material removed, while low heat input minimizes the heat affected zone (HAZ), thereby reducing the degree of thermal deformation. The non-contact nature of the laser cutting process also reduces the risk of mechanical deformation, especially for flexible or thin materials, and reduces the risk of material contamination. Due to smaller tolerances, narrower cut widths, smaller heat-affected areas, and less material deformation, the design of laser-cut parts can be arranged more closely together on the material. This compact design reduces the amount of material wasted, thereby reducing material costs over time.
Although the initial investment of laser cutting equipment is usually higher than other cutting processes, the operation and maintenance costs are relatively low. Laser cutting machines can perform multiple operations and applications without the need to purchase or replace separate, custom-designed tools; this feature of laser cutting not only reduces the total cost of equipment, but also reduces the delivery time between different processes and applications . In addition, because laser cutting is a non-contact process, compared with contact cutting processes (such as mechanical cutting or rotary die cutting), laser components have less fatigue and therefore have a longer service life. Coupled with the relatively cheap replacement of laser components, the durability of laser components further reduces the total cost of the equipment.
Other advantages of laser cutting include reducing the risk of operator injury and creating a quieter operating environment. The laser cutting process hardly uses any mechanical components and does not occur inside the housing, so the risk of operator injury is small. Since less noise is generated during laser cutting, the overall working environment has also been improved.
Limitations of laser cutting
Although laser cutting has advantages over other forms of cutting, the process also has limitations, including:
♦Scope of applicable materials
♦Higher energy and power consumption
♦Higher equipment cost
As mentioned earlier, laser cutting is suitable for various metals and non-metals. However, the material being cut and its properties often limit the applicability of certain cutting mechanisms, auxiliary gases, and laser types. In addition, the material thickness plays an important role in determining the optimal laser power, auxiliary gas pressure, and focus position for laser cutting applications. Different materials or different thicknesses in a single material also need to adjust the cutting speed and depth during the entire cutting process. These adjustments will lead to inconsistent production time and increase turnaround time, especially in mass production.
One advantage of laser cutting is that it produces high-quality cuts, which usually do not require extensive secondary cleaning, processing or finishing. Although this is advantageous in some respects, the final work hardening of laser cut edges can be problematic for certain applications. For example, parts that require further treatment (such as powder coatings or paints) need to be surface treated after the laser cutting process before receiving the necessary coatings or paints. Adding this step will increase turnaround time and total processing costs.
Although over time, laser cutting can reduce maintenance costs and material costs, for certain manufacturing applications, using other cutting processes may be more cost-effective. For example, although both metal and non-metal materials can be laser cut, laser cutting plastics releases potentially harmful and toxic gases. These emissions require air pollution control equipment, thereby increasing the necessary equipment costs. For manufacturers and repair shops, although the cost of replacing and maintaining parts is relatively low, the initial investment in laser cutting equipment tends to be higher compared to more traditional cutting processes. In addition, laser cutting equipment generally consumes more power and energy than other cutting processes, resulting in a further increase in operating costs. In general, high initial equipment and operating costs may make laser cutting unsuitable for low-budget operations.