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Do you really know laser cutting? Let's talk about these 6 great gods after reading them.
- 2020-10-21 13:03:29 -

In recent years, the role of laser cutting machine in the development of sheet metal industry has become increasingly prominent. In the cutting process, there are six practical functions, with these practical functions, can greatly improve the laser cutting machine processing efficiency and cutting performance.

1. Frog jump.

Frog jumping is the air-range way of a laser cutter. As shown in the figure below, cut hole 1, followed by cut hole 2. The cutting head is moved from point A to point B. Of course, turn off the laser during movement. The process of motion from point A to point B, the machine "empty" run, called the empty range.

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The space of the early laser cutter is shown in the figure below, where the cutting head completes three second movements: rising (to a sufficiently safe height), flat (reaching above point B), and lowering.

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Compressed air time improves the efficiency of the machine. If you change the third completed action to "simultaneous" completion, you can shorten the space time: when the cutting head moves from point A to point B, it rises at the same time, and decreases at the same time as you approach point B. This is shown in the figure below.

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The trajectory of cutting the head's empty motion is like an arc drawn by a frog's jump.

In the development of laser cutting machine, frog jumping is a prominent technological progress. Frog jump action, only used from point A to point B flat time, saving the time to rise and fall. Frogs jump to catch food; laser cutters jump, "catch" to high efficiency. If the laser cutter doesn't have the frog jump function now, I'm afraid it won't flow in.

2. Autofocus.

When cutting different materials, the focus of the laser beam is required to fall at different positions in the workman section. Therefore, the position of the focus (focus) needs to be adjusted. Early laser cutters were generally manually tuned;

Some people may say, change the height of the cutting head is good, the cutting head is raised, the focus position is high, the cutting head is lowered, the focus position is low. It's not that simple.

In fact, in the cutting process, the distance between the nozzle and the work piece (nozzle height) is about 0.5 to 1.5mm, it may be regarded as a fixed value, that is, the nozzle height does not change, so can not be adjusted by lifting the cutting head (otherwise the cutting process can not be completed).

The focal length of the focus mirror is imm changed, so you can't expect to focus by changing the focal length. If you change the position of the focus mirror, you can change the focus position: the focus mirror drops, the focus drops, the focus mirror rises, the focus increases. This is indeed a way of focusing. Autofocus can be achieved by using a motor-driven focus mirror for up-and-down motion.

Another method of autofocusing is to change the position of the focus by changing the curvature of the reflector by changing the curvature of the reflector and changing the dispersion angle of the reflected beam before the beam enters the focus mirror. This is shown in the figure below.

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With autofocus, the processing efficiency of the laser cutter can be significantly improved: the thickness plate perforation time is greatly reduced, and the machine automatically adjusts the focus to the most suitable position by working with work parts of different materials and thicknesses.

3. Automatic edge hunting.

As shown in the figure below, when the plate is placed on the workbench, if skewed, it can cause waste when cutting. If the tilt angle and origin of the plate can be sensed, the cutting process can be adjusted to fit the angle and position of the plate to avoid waste. Automatic edge-finding came into being.

After starting the automatic edge-finding function, the cutting head starts from point P and automatically measures 3 points on the vertical edges of the plate: P1, P2, P3, and automatically calculates the tilt angle A of the plate material, as well as the origin of the plate material.

With the automatic edge-finding function, the earlier adjustment of work pieces is saved - adjusting (moving) work items weighing hundreds of kilograms on the cutting bench is not easy and improves the efficiency of the machine.

A high-power laser cutting machine with advanced and powerful technology is a complex system of optical, machine and electrical integration. Nuances often hide the mystery. Let's take a peek at the mystery.

4. Concentrated perforation.

Concentrated perforation, also known as pre-perforation, is a process, not the function of the machine itself. When laser cutting thicker plates, each profile of the cutting process to go through two stages: 1. perforation, 2. cutting.

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Conventional machining process (A-point perforation→ cutting contour 1→B-point perforation→ cutting profile 2 →... ), the so-called centralized perforation, is the entire board of all perforation process in advance centralized execution, and then back to perform the cutting process.

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The total operating trajectory of the machine is increased when the concentrated perforation process (completion of perforation of all contours→ returns to the starting point →cuts all contours) compared to conventional machining processes. So why use centralized perforation?

Concentrated perforation avoids overcosting. During the perforation of the thick plate, heat accumulation is formed around the perforation point, and if cut immediately after, there will be an over-burning phenomenon. Using the centralized perforation process, complete all perforation, return to the starting point and then cut, because there is sufficient time to dissipate heat, it avoids the phenomenon of over-burning.

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Concentrated perforation improves processing efficiency. At present, there are still many laser cutters do not have the function of autofocus. Process parameters (laser mode, power, nozzle height, auxiliary gas pressure, etc.) are different for processing thick plates, perforation and cutting. The nozzle height during perforation is higher than during the cutting process. If conventional machining processes (contour 1 perforation→ contour 1 → contour 2 perforation→ contour 2 → ... ), in order to ensure the quality and efficiency of cutting, the focus of the laser beam can only be manually adjusted to the best position according to the needs of cutting (imagine if this is the case: at first, the focus manually adjusted to the position required for perforation, perforation; until the processing is complete - it's a nightmare. Therefore, the focus at perforation must not be in the best position, and the perforation time will be longer. However, by means of centralized perforation, the focus can be adjusted to the position suitable for perforation, after the perforation is completed, the machine is paused, and then the focus position is adjusted to the best position required for cutting; Of course, other process parameters can also be adjusted or changed in the middle of concentrated perforation and cutting if necessary (e.g. perforation can be done using air plus continuous waves, while cutting with oxygen, with sufficient time in the middle to complete the gas switch). We generally refer to the automatic zoom of the drive focus mirror as the F-axis;

There are also risks to concentrated perforation. If a collision occurs during the cutting process, causing the plate position to change, the uncut part may be scrapped. The centralized perforation process requires the help of an automated programming system.

5. Bridge bit (micro-connection)

During laser cutting, the plate is held by a jagged support bar. Parts that have been cut down may lose their balance and be raised if they are not small enough to fall from the gaps in the support bar, or if they are not large enough to be held by the support bars. The high-speed moving cutting head may collide with it, stop lightly, and damage the cutting head at a heavy weight.

This can be avoided by using the bridge position (micro-connection) cutting process. When laser cutting programming is performed on graphics, the closed contours are deliberately closed and disconnected in several places so that the parts are glued together with the surrounding material after the cut so that they do not fall, and these disconnects are the bridge positions. Also known as break points, or micro-connections (this is called from a rigid translation of MicroJoint). The distance of disconnection, about 0.2 to 1mm, is inversely inversely related to the thickness of the plate. Based on different angles, there are these different calls: based on contours, broken, so called break points;

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Bridge positions connect parts to surrounding materials, and sophisticated programming software automatically adds a suitable number of bridge positions depending on the length of the profile. Can also distinguish the internal and external contours, decide whether to add bridge position, so that the internal contour (waste) does not leave the bridge position dropped, while the outer outline (parts) of the left bridge position and the master material glued together, do not drop, thus eliminating the sorting work.

6. Co-edge cutting.

If the contours of adjacent parts are straight lines and the angles are the same, they can be combined into a straight line and cut only once. This is co-edge cutting. It is clear that co-cutting reduces cutting length and significantly improves processing efficiency.

Co-cutting does not require the shape of the part to be rectangular. Here's the picture.

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Sky blue lines for common edges, co-cutting, not only save cutting time, but also reduce the number of perforations, therefore, the benefits are very obvious. If we save 1.5 hours per day due to co-cutting, about 500 hours per year, and the combined cost per hour is 100 yuan, it is equivalent to an additional $50,000 in benefits per year. Co-cutting relies on intelligent automated programming software.