Common sense to pay attention to to improve the quality of laser cutting

With the rapid development of the industry, the improvement of the cutting quality of parts is particularly important. Of course, there are many factors that affect cutting, such as: cutting parameters, working gas type and quality, operator's technical ability and understanding of cutting machine equipment, etc. The following will start from optimized programming and process control, and talk about some common ones. Ways to improve cutting quality.
(1) The correct use of AutoCAD to draw part graphics is the first step to ensure the quality of part cutting. Usually nesting and typesetting personnel prepare part programs strictly in accordance with the part drawings. For some flange splicing and slender parts, they will use it when programming Reasonable and effective measures: soft compensation, special technology (common edge, continuous cutting)... to ensure that the cut parts can pass the dimensional inspection smoothly.
 
 (2)Since the central column (cone, column, web, cover) in the round pile is relatively large,it is recommended to perform special processing and micro-connection (increase breakpoints)during programming before cutting.That is, set some temporary non-cutting points (5mm) on the same side of the part being cut. The function of these points is to connect with the steel plate during the cutting process to fix the parts to avoid displacement and shrinkage deformation, and then cut these points after the other areas are cut. This is also one of the methods to ensure that the dimensions of the cut parts are not deformed.

Strengthen the control of the process of cutting parts
Strengthening the process control of cutting parts is the key to improving the quality of cutting parts. After a large amount of data analysis, the factors that affect cutting quality are as follows: operator, cutting nozzle selection, adjustment of the distance between cutting nozzle and workpiece, and cutting speed adjustment , And the perpendicularity between the surface of the steel plate and the cutting nozzle.

(1) When operating the CNC cutting machine to cut parts, the operator is usually required to cut the parts according to the material cutting process, and have self-inspection awareness to be able to distinguish whether the first part of the cut is qualified or not. If there is an unqualified situation, it must be timely Correct the repair and submit it to the quality inspection. After the inspection is completed, the first qualified ticket will be signed before the part can be mass produced.

(2) What type of cutting nozzle is used and the distance between the cutting nozzle and the workpiece should be selected based on the cutting thickness. Usually the size of the cutting nozzle is proportional to the cutting thickness. The larger the cutting nozzle, the thicker the cutting thickness. The distance between the cutting nozzle and the steel plate will be affected: too far, the heating area is likely to be too large, and the parts will be deformed; too close, the cutting nozzle will be blocked, resulting in waste of damaged parts, reducing the cutting speed, and reducing production efficiency.

(3) The thickness of the workpiece and the type of cutting nozzle will directly affect the adjustment of the cutting speed, which generally slows down with the increase of the cutting thickness; the speed of the cutting speed also affects the quality of the part cut; the correct cutting speed will be affected by the slag A regular popping sound is emitted when it flows, and the slag outlet and the cutting nozzle are in a line; a reasonable cutting speed will greatly improve the cutting efficiency.

(4) The correct cutting angle is: the cutting nozzle is perpendicular to the surface of the cut steel plate at 90°. If it is not perpendicular, it will cause the part section to tilt, which will affect the uneven size of the upper and lower parts, and the accuracy cannot be guaranteed, which may cause a quality accident; use the cutting nozzle. Before cutting, you must pay attention to check its permeability. If blocked, it will cause the airflow to tilt, causing the cutting nozzle and the steel plate surface to be non-vertical, resulting in cutting size errors.
Note: Before cutting, you must adjust the cutting gun and cutting nozzle to ensure that they are perpendicular to the surface of the platform steel plate.

Use the most optimized nesting programming process

The CNC cutting machine is a digital program that drives the movement of the machine tool. As the machine moves, the randomly equipped cutting tool cuts the parts, so the programming method of the parts on the steel plate plays a decisive role in the quality of the cut parts.

Optimizing the nesting programming process can improve the cutting quality of parts. The analysis includes:
(1) Optimize the nesting cutting process The optimized nesting diagram will change from the nesting state to the cutting state. Often use parameter settings, from the starting point of the inner and outer contours, the introduction of lead lines, and the adjustment of the contour direction to achieve the shortest idle distance and the smallest probability of thermal deformation to improve the cutting quality.

(2) The special process of optimizing nesting is based on the part outline on the layout drawing, and design the cutting trajectory that meets the actual needs through the "drawing" operation, such as anti-deformation micro-connection cutting, multi-part continuous cutting, bridge cutting, etc. Use optimization to improve cutting efficiency and quality.

(3) The selection of reasonable process parameters is also particularly important. For steel plates of different thicknesses, the corresponding cutting parameters should be selected, such as the selection of lead-in lines, lead-out lines, part spacing, plate edge distance and reserved opening size.
In production, sum up experience and find a good method; maximum ability control to ensure the size of the blanking parts. Improve the cutting quality and production efficiency by optimizing the process of drawing and nesting programming, parts management and control.