What factors affect the processing accuracy of metal laser cutting machine? What is the cause of the error? It is undeniable that compared with the traditional processing technology, the metal laser cutting machine has higher processing accuracy, better section effect and no need for secondary processing. When metal laser cutting machine is used to process metal materials, the working efficiency can be greatly improved. However, many enterprises find that the cutting accuracy of laser cutting equipment is sometimes not ideal in use, and there are many problems in the use of metal laser cutting machine, including errors in the laser cutting process, poor laser cutting effect, etc. These problems also affect the subsequent processing flow. So how did these errors come about? What factors affect the processing accuracy of metal laser cutting machine?

What factors affect the processing accuracy of metal laser cutting machine? What is the cause of the error?

The geometric error of the workpiece is affected by various reasons. The workpiece surface will fluctuate and generate heat during the cutting process, which makes the surface of thin plate parts easy to deform. Due to the unevenness of the surface, the laser focus changes randomly with the position and ideal position of the workpiece surface. 2. The cutting thickness of material exceeds the standard of cutting material. Take 3000 watts as an example. The thickness of the cutting plate of the laser cutting machine is less than 20 watts. The thinner the plate, the easier the cutting and the better the quality. If the plate is too thick, it will be difficult to cut with the laser cutting machine, so there will be errors in processing accuracy when cutting, so it is necessary to determine the thickness of the plate. 3. Programming error During the processing of the optical fiber laser cutting machine, the processing path on the complex curved surface is fitted with straight lines and arcs. There is an error between the fitting curve and the actual curve, which leads to the error between the relative position of the actual focus and the surface of the object to be processed and the ideal programming position. Some teaching programming systems may also bring some errors.

In the cutting process of metal laser cutting machine, the focus position error will occur in the laser cutting process. There are many factors that change the relative position between the focus and the surface of the object to be processed, which is also related to the surface finish of the product to be processed. The clamping mode of the workpiece, the geometric error of the machine tool and the long-term load of the machine tool will deform. The thermal deformation of the workpiece during processing will lead to the deviation between the laser focus position and the ideal given position (programmed position). For these random errors, this is inevitable. Only through online detection and control can errors be reduced, so as to improve the working accuracy of metal laser cutting machine.

1. Processing material

When laser cutting machine is used to process metal, the cutting accuracy is different for different materials. Even for the same material, if the composition of the material is different, the cutting accuracy will also be different. Therefore, the workpiece material also has a certain impact on the laser cutting accuracy. Generally, the smoother the material is, the higher the machining accuracy is.

Therefore, when processing different metal materials, you can make samples in advance to find out the most suitable parameter settings for such materials.

2. Shape of laser beam

The laser beam of metal laser cutting machine is conical, so the slit cut is also conical. The shape of laser beam is also a major factor affecting the cutting accuracy of metal laser cutting machine. The smaller the spot after the laser beam is concentrated, the smaller the kerf, and the higher the machining accuracy.

In this tapered laser beam condition, the greater the thickness of the workpiece, the lower the accuracy, and therefore the larger the kerf. Therefore, when processing metals with different thicknesses, it is necessary to select the appropriate laser power to obtain better results.

3. Accuracy of worktable

When the metal laser cutting machine is processing, the worktable vibrates with the vibration of the laser head. The higher the precision of cutting, the higher the precision of cutting is when the high-precision workbench is matched with stable linear guide rail and stepping motor; If the worktable is uneven or for other reasons, the processing accuracy of the laser cutting machine will also be affected.

4. Auxiliary gas and nozzle

In the process of metal laser cutting machine, the auxiliary gas and nozzle play a role in cleaning and controlling the cutting speed. The uneven pressure and temperature in the air flow will cause the change of the air flow field density, which will dry up the focusing of the beam energy, cause refocusing or beam divergence, and affect the metal cutting accuracy.

What factors affect the processing accuracy of metal laser cutting machine? The reason for the error will be introduced here today. If you want to know more about the metal laser cutting machine, please call us for advice.