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In-depth analysis of cantilever structure laser cutting machine
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In-depth analysis of cantilever structure laser cutting machine

In-depth analysis of cantilever structure laser cutting machine

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(Summary description)        There are various types of laser cutting machine structures, the most common being cantilever and gantry structures (gantry can be divided into several types, which will be analyzed at another time).

In-depth analysis of cantilever structure laser cutting machine

(Summary description)        There are various types of laser cutting machine structures, the most common being cantilever and gantry structures (gantry can be divided into several types, which will be analyzed at another time).

Information

         There are various types of laser cutting machine structures, the most common being cantilever and gantry structures (gantry can be divided into several types, which will be analyzed at another time).


So the question is: which is the better structure, the cantilever or the gantry?

The picture below is a real picture of the gantry laser cutter.



The picture below is a physical representation of the cantilevered laser cutter.

From the user's point of view, it's definitely better to cantilever:.
Cantilever structure, openness and accessibility, can load and unload materials from three directions, easy to operate; if appropriate measures are taken, workpieces that exceed the machine's stroke can be processed.
Even if the table is deformed by heat, it will not affect the accuracy of the machine.
③ Drive system screw (or rack and pinion), guide rail, etc. away from the cutting area, supplemented by closed protection from smoke and dust pollution, and long service life.
④ Only single motor drive, no bilateral synchronous drive error. Low wear of driving parts (screw or rack and pinion), high precision and good cutting consistency.
Because of the side opening, rotary mechanism can be conveniently installed on the working table for small pipe workpiece processing, as shown in the above figure; because the working table is separated from the main machine, when necessary, the large rotary table can be exchanged with the plane working table in space to realize dual functions of pipe cutting and flat plate cutting.

        Then, the question arises again: cantilever structure has so many benefits, using the cantilever structure of the manufacturer is not so much?

        This touches on the heart of cantilever construction. Cantilever construction has many benefits for the user, but for the manufacturer, there are many challenges to solve. Different manufacturers have made different choices in the face of these challenges. In fact, in the early days, quite a few manufacturers adopted cantilever structures; it is only in recent years, as the laser cutting machine has entered the 100-meter era (movement speed of 100m/min), there are fewer and fewer of them.

As shown in the figure below, the beam will deform under the load, called deflection. The cantilever beam itself, with its own weight and the Z-axis moving on it, is the load it receives.



       In the pre-hundred meter era, the problem of cantilever beam deflection was simple and could be solved by increasing the beam's cross-sectional area. In the 100-meter era, simply increasing the cross-sectional area of the beam not only did not solve the problem, but also created new problems. The high speed of movement, high acceleration, and high dynamic characteristics require a reduction in the weight of the beam. The high acceleration created a dynamic deflection problem, with deformation of the cutting trajectory at the distal end of the cantilever beam. The rational choice was to build on the strengths and avoid the weaknesses, and some manufacturers abandoned the cantilever structure.

The use of unique design and manufacturing technology allows the cantilever structure to continue to have its advantages in the 100-meter era.
① The cantilever beam is made of patented aviation material, which is light, strong and rigid.
② Finite element analysis is used to design the cantilever fishbelly structure.


The figure below shows the comparison between the fish web cantilever beam and the gantry beam. For well-known reasons, the internal structure of the fish belly is not shown here. The cross-sectional width of the cantilever beam is twice as wide as that of the gantry beam.



③ Adopt counterweight design, the center of gravity is close to the guide rail and drive gear, so that the cantilever beam has good motion stability.

④ The cantilever beam adopts pre-load processing technology to offset the deflection of the beam caused by the actual load.
⑤ Cantilever beam, which can be adapted to the needs of high acceleration and high movement speed.


At present, the cantilever structure is adopted by Italian Prima, Germany Tongfei, Shanghai Prima Intelligent Technology and other companies.
 

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