Monday, 18 July 2016

Laser Cutting Basics

Laser cutting is fast and productive

Laser beam cutting with  machines outperforms conventional cutting systems in terms of speed, throughput and productivity. Today, laser cutting can be done much easier and faster than ever before and is used in a wide range of applications and industries. As one of the world's leading manufacturers of laser systems,  offers innovative laser cutting machines for diverse applications, such as cutting of acrylic, or laser cutting of architectural models, foils and films, signage, paper, toys, wood, and many more. In all applications and industries, laser machines stand for clean, fast and high-quality laser cutting.

Laser machines can be used flexibly

A laser cutting machine from Trotec can very easily be adapted to diverse application requirements. With the laser beam, individual batches can be cut just as easily and economically as mass productions; small workpieces are equally suited for laser cutting as large objects.

Laser cutting machines are equipped with integrated cameras that detect registration marks and automatically control the position of the laser at maximum precision, even if the original template is rotated, expanded or distorted.

Safe process

During laser cutting, there is no need for aligning or fastening the material. Users will never come into contact with open and moving machine parts. In short: A  laser cutting machine is as safe to use as a CD player or a microwave oven. And it goes without saying that they additionally fulfil the most stringent safety standards.

Sharp edges

Laser cutting machines produce a perfect laser cut and always deliver sharp and clean edges that will not fray. When working on acrylic, a flame-polished edge is produced.

A laser machine stands for maximum quality, reliability, performance and speed. Besides, laser cutting is extremely profitable. Laser cutting machines are not subject to wear and tear, will consequently pay off quickly, and will maximize a company's income.

What are the Benefits and Drawbacks of Laser Cutting

During mechanical cutting, by saw, for example, machines can be contaminated by the materials they are cutting and can also be dulled by frequent extended use. 

Precision in laser beams is also higher than that of typical industrial cutting materials. In short, custom laser cutting produces greater consistency from part to part. Laser cutting gives you cleaner, burr-free cuts, quicker production, minimal operator intervention (so less human error), and greater accuracy means less wasted metal and lower costs to the manufacturer. 

Mechanical cutting is simple machining but requires less energy than does laser cutting, the main weakness in the process. Also, the laser cutting process requires cooling. Water is a commonly used coolant, usually circulated through a chiller or heat transfer system.

What are the Types of Laser Cutting?

There are three main types of laser cutting. The CO2 laser is used to cut, bore, or engrave. Nd is used for boring when there are high-energy requirements but low repetition. 

Nd-YAG laser is used where high power is needed. Both are used for welding. A typical laser machining apparatus consists of a power supply for producing a laser beam, a work piece positioning table, laser material, a method of stimulation, mirrors, and a focusing lens.

The work piece is fixated by straps, clamps, tabs, magnets, or suction cups.

The laser cutting process

Laser head and tolerance

The beam is emitted from what’s called the ‘laser tube’ and is reflected by several mirrors up into the ‘laser head’ (like a periscope.) Within the head is a lens that finely focuses the beam onto the material surface for cutting or engraving.

The kerf refers to how much of the material the laser takes away when cutting through. (the width of the groove made while cutting.) This varies from material to material and is also dependent on the laser beam tolerance i.e. the width of the beam. All our machines have a very fine tolerance.

You send us your artwork and we check to see if it is fine for the laser cutter and the material you would like to cut. The machine reads vector strokes of hairline thickness in red or as thin as you make them.

We lay your chosen material in our machine bed and configure the machine to cut your artwork. We adjust the Power, Speed and Frequency to suit your specific material. We have 3 laser cutters in our studio. The maximum sheet size we can cut is an enormous 2400mmx 1200mm.

The machine will then follow the path of your drawing strokes to cut out the components you have drawn.

Depending on the material, we usually use a protective backing during the laser cutting process that can be peeled away after the cutting is complete. This protects the surface from heat and burn marks.

What Is Laser Cutting Technology?

Laser cutting uses a high-powered beam to cut material based on computer-controlled parameters. As the laser guides its beam along the material, everything in its direct path is vaporized, burned or melted. 

One of the benefits of laser cutting technology is the cut product rarely needs any finishing work as this process ensures a high-quality surface finish.

Laser cutting technology comes in two formats: gantry and galvanometer systems. Gantry systems position the laser perpendicular to the material and the machine physically directs the beam over its surface. 

Since gantry is the slower of the two systems, manufacturers commonly use it for producing prototypes. 

In contrast, galvanometer systems use mirrored angles to preposition the laser beam and can cut as fast as 100 feet per minute. Fabricators commonly use galvanometer systems for full-on production work.

What Is Laser Cutting

The original laser, based on stimulating a ruby crystal, was low power. Despite such humble beginnings, laser technology has seen spectacular developments that enable parts to be created that even in 1990 were not easy to make using traditional means.

A laser beam is characterized as being coherent radiation of a single wavelength (also know as monochromatic light). The advantage of monochromatic light is that it will not dissipate its energy as quickly as conventional light beams. It is these characteristics that make a laser beam suitable for the energy transfer needed to cut metals.

Modern industrial cutting lasers are primarily carbon dioxide lasers where carbon dioxide gas is the stimulated medium (as opposed to the original ruby laser), emitting radiation with a wave length of 10.6 micrometer. This is infra-red radiation, which cannot be seen with the naked eye but is a safety hazard to an unprotected eye.

Lasers are adapted to cutting by the process of polarizing and focusing a beam of high power laser light onto a work piece. This melts or burns the material along the cut line. To clear the cut and prevent rejoining, a cut assist gas aligned concentrically with the laser beam expels melted materials clean from the cut area. Cut assist gases in common use are oxygen, nitrogen and air. Oxygen is typically used for mild steel cutting. Nitrogen (an inert gas in this process) is used for stainless steel cutting, where it acts to shield the hot stainless steel from oxygen, much like argon is used in welding processes. Both air and nitrogen can be used for aluminium cutting.

The laser beam is directed to the cutting head by specialized water cooled mirrors, where it is focused using a special lens made of zinc selenide. The beam diameter before the lens is about 25mm or 7 watts per square mm. This is reduced to 0.25 mm, or 71,000 watts per square mm, at the focal point where cutting occurs.

The cutting head is coupled to a conventional CNC system which directs the cutting head position according to the computer program controlling the job. A part is created in a computer aided design (CAD) system on a PC, programmed to be run on the CNC.

Monday, 4 July 2016

Advantages of Laser Cutting

Laser cutting has become the necessity of every industry in today’s time and the industrial purpose of laser technology is perfect for prototyping with no tooling cost. 

The Laser Technology has some exceptional advantages which are as follows:

Less production cost per piece due to reduction in lead & set up time

No tooling cost as expensive - Jigs/Fixtures is not required

Changes in part design can be incorporated very easily and at a low cost

Less scrap due to consistent accuracy and absence of operator error

Excellent edge quality with Finish

Exactness & Repeatability

Fast working on complex shapes

Applicability to any types of materials

No post processing on jobs

No wear or breakage due to non-contact nature

Low Distortion On Work Piece

Reduction in material waste: material saving by using nesting software

Ecologically Clean Technology

Suitable for prototyping, small volume production as well as production line integration, which lead to overall saving in cost,

Increases production efficiency and high accuracy in finished products

Mission of Telsa Automation

Telsa Automation mission is to continuously improve our abilities so that we provide our customers with the highest level of product and service possible and maintain our position as finest laser job shop. 

Telsa Automation applies the immense power and versatility of laser cutting for our customers in innovative ways to help them achieve success.

Telsa Automation constantly strives to obtain the highest level of project management, programming, punching, forming, and machining, welding and other fabrication skills necessary to complement most complete laser job shop.

Telsa Automation develops strong and honest partnerships with our customers by exceeding their quality requirements and solving their problems while providing competitive pricing and exceptional service.

Develop Strong  and Honest Partnership with our customers by exceeding  their product quality  and requirements

Providing Competitive Pricing and Exceptional Service