ieee_laser_workshop.pdf

8/19/2019 IEEE_Laser_Workshop.pdf

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Laser Cutting


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Laser Cutter


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Theodore

Maiman


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Laser Beam Machining (LBM)

Definition of LASER

● Laser is the abbreviation of “Light Amplification by Stimulated Emission of Radia● A highly collimated monochromatic and coherent light beam is generated and foc

spot , so that high power densities are then obtained.


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Types Of LASER

Types Wavelength (nm)

Solid RubyNd YAG (Hair Removal)

Nd Glass

6941064

1064

Semiconductor GaAs (Gallium Arsenide) 800-900

Molecular CO2 10.6 (um)


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Ruby Laser


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Ruby Laser


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Applications

● Cutting● Marking

● Welding

● Scribing

● Drilling

● Surface Treatment

● Surgery and hair removal


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Laser Beam Machine


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CO2 Laser Tube


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Laser Path


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Mirror


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Laser Head


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Principle Of Material Removal

● The workpiece material is removed

through several effects including

reflection, absorption and conduction of

light that is followed by melting and

evaporation.

● At a given wavelength, the higher the

reflectivity of the material the lower is thematerial removal rate and vice versa.

● The level of reflectivity can substantially

be reduced by modifying the surface

conditions.


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Removal Rate


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LASER Cutter Parameters

● Power (0 → 100%)- Depends on LASER Power Used (700mW,2W,30

● Speed (0 → 100%)

- Affects Production Rate

● Pulse Per Inch (PPI)

- Affects Finishing


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Machining Speed


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General Comments

● Non metals can be cut at higher speeds than dones, since metals have higher reflectivity and

conductivity

● To achieve the same cutting speed greater pow

density lasers should be needed to cut through

materials.● The smaller the depth of altered layer associate

high cutting rates is an advantage of laser beam

machining.


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Machinability

The term Machinability refers to the ease with which a metal can be machined to an a

surface finish.


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Parameters Affecting LASER


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Power & Speed Vs Thickness


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Heat Affected Zone (HAZ)


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LASER Drilling


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Micro Drilling


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Texturing


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Cutting


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Engraving


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Slitting


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Slitting


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3D Slicing


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Advantages

● Tool wear and breakage are absent.

● Holes can be located accurately by using optical laser system alignment for alignment.

● Very small holes of large aspect ratio can be produced

● A wide variety of hard and difficult-to-machine materials can be

● Machining is extremely rapid and the set-up times are econom

● Holes can be drilled at difficult entrance angles ( to the Holes c

at difficult entrance angles( to the surface). Due to its flexibilit

process can be automated easily such as the on-the-fly operat

gauge material which requires one shot to produce a hole.

● The operating cost is low.


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Disadvantages

● High equipment cost.

● Tapers are normally encountered in the direct d

holes.

● A hole of precise depth is difficult.

● The thickness of the material that can be laser

restricted to 50 mm.● Adherent material need to be removed.


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LASER Cutters

● High Power (30W, 80W)


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LASER Cutters

● Low Power

Mr. Beam Risha


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Hazards

● Noise / Vibration● Gases / Fumes

● Radiation

● Reflected / Scattered Light

● Particles / Aerosols


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Protective Measures


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SoftwareInkscape


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Raster Graphics

● A Raster Graphics Image, or Bitmap, is a dot m

data structure representing a generally rectang

of pixels, or points of color.

● Raster images are stored in image files with va

formats.


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Vector Graphics

● Vector graphics is the use of geometrprimitives such as points, lines, curve

shapes or polygons—all of which are

on mathematical expressions—to rep

images in computer graphics.● Vector graphics are based on vectors

called paths)


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Inkscape

http://inkscape.org/en/download/


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Box Maker

http://boxmaker.rahulbotics.com/

C f


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Laserpro C180 Preferences

L C180 P f


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Laserpro C180 Preferences

● 16 Colors

● Each color has

- Power

- Speed

- PPI

● Raster / VectorCheckbox


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Break


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ControlEng / Ahmed Abdel Aziz

GRBL Lib


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GRBL Library

● Grbl is software for controlling the momachines that make things.

GRBL Library

G-Code

PWM

S e q u e n c e

Sequence


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Ri h L C tt


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Risha Laser Cutter

Risha which means feather in

Arabic, is a new concept for lasercutters that is opensource,

portable, DIY, and easy to use.

The machine interfaces with

mobile phone to expand the user

base and make technology

accessible for almost anyone, as

long as they can sketch or draw.

www.reshalaser.org

While Rastering Ar

Risha Controller Soft are


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Risha Controller Software

Risha Workshops


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Risha Workshops

Risha Workshops


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Risha Workshops

Barcelona

Spain

Th k Y


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Thank You

www.reshalaser.org

ieee_laser_workshop.pdf

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