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Tag: hlavni-cinnosti-firmy:Laser cutting Řadit dle
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. {rokbox  thumb=|images/stories/P1060484-tn.JPG| title=|Cog wheels cutted by laser|}images/stories/P1060484.JPG{/rokbox} {rokbox  thumb=|images/stories/P1060492-tn.JPG| title=|Stainless stell th. 5mm|}images/stories/P1060492.JPG{/rokbox}

The company CHPS Ltd. was entered into the Commercial Register on August 5, 1996. It began its activities in one rented office with the bright idea to create a universal customized workspace for dividing material precisely according to shape and following the example of many European workshops. The first technological unit - water jet - was put into operation in January 1997. The company was continuing to systematically build up its reputation for being a strong, flexible and very reliable firm, not least among its circle of satisfied customers. In January 2001 another technological unit was put into operation - the laser-cutting machine. In 2002 it received certification for the quality management system in accordance with ISO 9001 and the number of employees exceeds more than 30. In 2003 we installed another unit for cutting by water jet.

The market demand reuquired a complete change of the company concept and transition from a cutting centre to complete high-quality stainless- and other sheet metals processing company. In April 2004 we bought and installed new CNC break press and other equipment for the Metal division. We join Europe as a quality and reliable subcontractor. In 2006 we was collaborate just with six important customers from Germany and Great Britain. In 2011 we were the first in the Czech Republic who installed a Fiberlaser Salvagnini – we are not afraid of new progressive technologies!!! And in December 2013 we were the first ones who put a new high-power CO2 Laser into operation from a significant but in Europe starting japanese Manufacturer Mitsubishi Electric. Today the company CHPS s.r.o. has over 60 employees and we achieved a turnover of more than 60 million CZK (more than 2,4 milion euro).

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Vision and strategy

"We connect through cutting"

INTERESTS OF OUR CUSTOMERS WITH INTERESTS OF OUR COMPANY POSSIBILITIES OF MODERN TECHNOLOGY WITH OUR CUSTOMERS' NEEDS OUR EMPLOYEES INTO A COHERENT TEAM

The main purpose of the entrepreneurial activities of the firm CHPS s.r.o. was, is and will be the precise custom-made division of material supplemented of complex qualitaty sheet metal processing. Every step that is and will be done for the development of the company in any field of activity attempts to give the customer another reason for satisfaction. This single-mindedly wins over the trust of the customer. Positive references will see that our circle of clients continues to grow both here and abroad. Above all, we want to make it possible for smaller businesses to use this modern technology in their production lines without having to make their own investment in it. That's why we intend to maintain our technological background at a high level and to expand it with new advanced technologies. The business activities of CHPS s.r.o. are founded on the trust and reliability of our partners (suppliers and customers) and stem from the principle of mutual advantage. Likewise, the choice and training of our employees and the demands made on them by the company management is constantly geared towards fulfilling the expectations of customers. For these reasons the ad slogan of our firm will always be fulfilled:

CHPS - The key to resolving your problems material cutting and sheet metal processing {rokbox thumb=|images/keys-tn.jpg| title=||}images/keys.jpg{/rokbox} Everything cutted by water-jet - stainless, granite, glass, wood

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.

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Laser workplace with the high-power cutting machine Mitsubishi

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Steel parts cutted by laser

Laser cutting is becoming cheaper, more precise and of higher quality thanks to the continuous development of the technology. With pieces routinely being cut by flame or plasma, the decision for laser cutting is not an easy one. Here is a simple list of convenient applications:

Cutting steel sheets (structural and stainless steel) of appropriate thickness for engineering work and any other purpose (decorative, interior, electro-technical, advertising, construction….) with a sufficient accuracy of +/-0,X mm Cutting Al sheets or sheet metals from nonferrous metals and alloys up to a maximum thickness of 5 mm for any purpose (for more than 3 mm it is much better to use water jet for cutting)

Examples of laser slops

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Improper uses are thus all those where the laser is not technologically capable of fulfilling the requirements: Cutting much too strong materials Cutting with precision in the hundredths of mm and better Cutting atypical materials Cutting on semi-finished products with the need to locate the cut with very high precision Cutting with a very high density of cuts or openings on the unit surface - mostly stronger materials risk deformation or smelting

From an economic viewpoint it is not advantageous for the most part to cut individual pieces or small batch orders. We are prepared to consult with you about your needs and recommend the best possible solution.

What shapes can be cut with a laser?

In general, any that can be transferred to the CAD computer program. Compared to a few years ago, when there was a problem to cut sharp "tips", small orifices, etc., the limitations of shapes today are far fewer:

Laser-fixed beam for cutting has a circular cross-section on a diameter from 0.1mm to 0.5 mm, so internal angles and sharp corners are mostly rounded to a negligible maximum radius of 0.3 mm, external corners can be completely sharp. The width of the cut groove can likewise range up to a value of approx. 0.5 mm. All other shaping limitations depend on the amount of heat transferred to the material while cutting and thus a degree of fusion of the material and subsequent deformation. Generally speaking - the thinner the sheet, the faster the cutting, meaning less heat and fewer limitations on shaping Orifices can be cut in black sheets with a minimum diameter of approx. 0.8 up to a single-multiple of the material thickness (e.g. D 8 up to a thickness of 10, D 15 up to a thickness of 15….), orifices can be cut in stainless steel with an approx. thickness multiple of 0.5 and less. This rule even applies for an orifice of another shape. In special cases the cutting smaller orifices can be tested, it depends on the material, the density of the orifices, etc. The bigger the proportion of cuts and burn loss on the unit area (dense network of orifices, complexity of the shapes to be cut…), the bigger the risk of shape deformation of the material - sagging, distortion, etc. This factor again depends on the thickness of the material - the stronger the material, the greater the risk. In extreme cases the cut cannot be performed - the material melts under the high temperature, the cuts weld back together, etc. With increasing thickness of the material, the options for using the so-called combined cut drop. On the contrary it is necessary to increase the distance between the pieces, leading to a major drop in the percentage of material for use. Our machines cannot make bevel and spatial 3D cuts; the cut must always pass through the entire thickness of the material. Our machines can make markings and descriptions of pieces with laser engraving. In view of the fact that this does not involve a special machines for this purpose, it is a relatively slow operation and the price is comparable to an actual cut. {rokbox thumb=|images/DSC00048-tn.jpg| title=||}images/dsc00048.jpg{/rokbox}

Even these detailed shapes are possible today with laser cutting

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Laser-marking pieces (engraving)

The final result of cutting is always dependent on the sum of the above-described effects and on the use of the material, the proper programming and set up of the cutting parameters. Practically everything is possible to test and that's why we recommend performing a cutting test in cases of uncertainty.

Occur bevels during laser cutting?

Laser cutting achieves the smallest bevel of all heat methods used for cutting materials. Again, this depends on the thickness of the material; on thinner sheets the cut is almost perpendicular, for a thickness around 10 mm the bevel can range up to approx. 1 degree.

How to form the shape of the cut

The program for processing the cutting codes works as an upgrade to its own CAD module. That's why it's always necessary to enter the given shapes in the CAD format. The optimum extension for files is *.dxf. The programming workspace is equipped with the program CorelDRAW 9, so it's also possible to process files in the format *.cdr (it's good to include a proportional scale in the drawings for these files or at least provide a few dimensions, as the scale can be distorted upon transfer to CAD). Of course, it's no problem to process the dimensions of the drawing or schematic, etc., in proper classical form. In case only the sample of the product is delivered, it must be taken into account that ordinary methods of measurement are used for producing the drawing (slide rule, tape measure, workshop protractor, etc.) and this can this lead to minor deviations. For signs, advertising pieces, etc., we can assist by using our database or a creative ingenuity supported by our knowledge of the technology.

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Programming workspace

In general lasers can cut several types of plastic, wood material, etc., in addition to metals, with some special modifications. But since water jet is a more suitable mean for cutting most of these materials (dangerous fumes can arise), our workstation specializes in the cutting of metals:

Structural steel with a thickness up to approx. 25 - 28 mm(for use in cutting special sheet metals optimally modified for laser cutting - e.g., Raex, SAEY-LaserFORM, Domex, etc., up to a thickness of 30 mm) Stainless steel up to a thickness of 20 mm (for cutting simpler shapes up to 25 mm) Aluminium and Al alloys up to a thickness of 18 mm (burrs occur for most ranges of thickness and it is better to cut with water) Brass, Bronze, Copper and other metals up to thk. of approx. 3-5mm Perforated metal sheets

Examples of common laser slops

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Laser cutting is very sensitive to the quality of the material, especially for structural steels:

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Laser cutting on low-quality sheet metal

Chemical composition - a higher content of Si is very harmful Means of production - for hot or cold rolling Homogeneity - non-homogeneity in the composition or defects in the material - hard patches, cavities, etc., make the cut difficult or impossible Surface - rust, major scale after rolling, labels with markings, description of paint coating, etc., considerably complicates the cut or makes it impossible

The best in this case is to use sheet metal already specially modified by the manufacturer for laser cutting (for examples, see above), where the much higher price of the material is compensated by the faster and cheaper cutting process and the better quality of cut. The surface of several types of sheet metal must be ground or lubricated, etc., before cutting. For sheet metals of unclear composition or origin, we recommend performing a test cut before the actual cut.

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Comparing the quality of a laser cut for specially modified sheet metal (Raex - upper sample) and common steels of 15 mm thickness

To use or not use foil?

Sheet metals covered with protective foil can be successfully cut if the foil is used only one-sidedly and it is designed specifically for laser cutting (most manufacturers usually offer this). It must be taken into account that the edge of the foil is slightly burned but this doesn't leave marks on the product. In case of uncertainty, again it is better to carry out a test cut of the concrete material. {rokbox thumb=|images/DSC00058-tn.jpg| title=||}images/dsc00058.jpg{/rokbox}

The result of cutting stainless steel ground sheet metal with protective foil

More plates on top of each other?

A laser cannot cut more plates on top of one another even with low thickness. It leads to welding one piece onto another and other complications when cutting.

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"

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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.

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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

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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 {rokbox thumb=|images/n/004-tn.JPG| title=||}images/n/004.JPG{/rokbox}

Prepare of cut by laser

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Laser cutting - in action...

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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 {rokbox thumb=|images/DSC00053-tn.jpg| title=||}images/dsc00053.jpg{/rokbox}

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 {rokbox thumb=|images/DSC00072-tn.jpg| title=||}images/dsc00072.jpg{/rokbox}

Sample of micro-bridge being used on minor pieces

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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.

CUSTOMIZED WORKSTATION FOR COMPLEX SHEET METAL PROCESSING USING LASER AND WATERJET CUTTING

 

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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
 

Our motto

Company Motto