The technology and its advantages PDF Print E-mail

How does a laser cutting machine work?

The basis for every cutting system is the source of the laser ray. The ray is led from the source or through an optic cable by a system of mirrors up to a cutting head carried to the portal of the cutting table. Today the CNC tables used for cutting in 2D are essentially two types - with so-called hybrid optics, when the clamped material moves on one axis and the cutting head on the other or with so-called flying optics, when the cutting head moves on both axes. The beam in the cutting head is sharpened into a technologically precise focal point dependent on the type and thickness of the material. By using the concentrated energy of the laser beam the cut material is:



  • Fused and the groove is continuously "crossblown" with an assist inert gas, most often nitrogen - so-called "fusion cut" (clean non-oxidized polished cuts)
  • Fused and burned off using oxygen as an assist gas for "oxidative cutting" (cuts with a noticeable trace of oxidation)
  • Possibly fused and evaporated for the seldom used "sublimation cutting"

A look at the laser cutting space



Modern cutting systems can allow for continuous changes in the output of the laser, the feed speed and other parameters, whose optimal combinations allow ever more precise and detailed cuts with lower temperature effects on the product and surrounding material. The abilities of individual cutting machines are due above all to the power of the source, which usually ranges today from 1200-6000 W, and the technical capability of the workspace. In any case, the upper limit of the technological possibilities of quality laser cutting for standard industrial practice lies today in the range of 20-25 mm thick material, which according to research experts in this field probably won't change very much in the future. Today development is concentrated mostly on the moving dynamics of machines and thanks to this, the high speed of laser cutting is used even for small pieces and those with difficult forms or many openings, which shortens production time considerably. New ways of economical efficiency improvement are always being searched.

We work with the modern technology of leading manufacturers Mitsubishi Electric a Salvagnini srl.

Our company, CHPS s.r.o., uses the quality machines SALVAGNINI L1Xe from Italy and Mitsubishi 3015 eX - 45CF-R from Japan.

A complete look at the SALVAGNINI L1Xe laser

Salvagnini laser parameters

  • the size of the processable formats is 3000*1500 mm
  • the power of the Fiberlaser source is 2000W (comparable to 3000W CO2 source)
  • repeatable cutting accuracy approx. +/- 0.05-0.1mm
  • kerf 0.1-0.15mm
  • possible to cut pure aluminium, copper, brass, bronze...
  • possiblity of marking with laser engraving

A complete look at the Mitsubishi 3015 eX laser

Mitsubishi laser parameters

  • Profile processing length is 3000*1500 mm
  • CO2 laser power 4500 W
  • Positioning speed up to 150 m/min.
  • Repetition precision of cut approx. +/- 0,05 mm
  • kerf approx. 0,2-0,5 mm
  • Laser engraving possible

Prepare of cut by laser

Laser cutting - in action...

Detail of resonator

Advantages and disadvantages of laser technology

The main advantage of this technology occurs when working with metals:
  • Repetable cutting accuracy of approx. +/- 0,1mm
  • High cutting speed
  • A high quality, smooth cut, almost without scaling or trace of heat residue, especially for a lower thickness of the material

The surface of polished or otherwise mechanically treated sheet metal remains undisturbed during laser cutting

  • A smooth polished cut when working with stainless steel in a nitrogen atmosphere, the laser Mitsubishi reaches hen using the Brilliant cut fuction a perfectly smooth cut for 6-12mm thick stainless steels.
  • Narrow kerf approx. 0,2-0,5 mm
  • With Fiberlaser i tis possible to cut pure aluminium and also other nonferrous metals and alloys
  • Optimum quality for most machine applications - price
  • Computer optimization of material use, in some cases the possibility to use a so-called combined cut
  • For thinner materials (up to approx. 5 mm) cutting is possible even for very detailed pieces, micro-bridges can be used

Sample of micro-bridge being used on minor pieces

DDetail of mark after break off from micro-bridge

It must, however, be said that cutting by laser is a method that creates and transfers heat that can negatively effect several work pieces. Traces of fusion can be seen on cuts primarily for a larger thickness of metal materials, weld-on spots can develop and with increasing thickness, the formation possibilities of the cut become more limited. Some pieces as a whole can be slightly deformed by the heat - bent, etc. The temperature-affected zone is also less suitable (hardening) for mild machining - e.g., making threads. That's why it is better to consult first about new products, possibly create reference samples. In view of the high productivity of the workspace, it is not economically feasible to manufacture individual pieces or significantly small batch orders.

 

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Water jet cutting

High-pressure water jet s a modern precise technology for cutting most flat materials (metals, plastics, rubber, glass, stone, ceramics...) up to a thickness of approx. 100 - 200 mm by cold cut. Water jet cuts to wood
Water jet cuts to aluminium
 

Laser cutting

Laser is a modern precise technology for cutting mainly structural-, stainless- and other types of steel and also other suitable metals up to a thickness of approx. 15-25mm.
Cog wheels cutted by laser Stainless stell th. 5mm
 

Metal processing

We focus above all on precision processing of stainless steel and other high-grade metal sheets into the form of ready. Bending of metal parts
Bending, welding and cleaning of metal part
 

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