The rapid prototyping process - coesum.it · Rapid prototyping processes There are numerous rapid...

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www.coesum.com www.coesum.com The rapid prototyping process

Transcript of The rapid prototyping process - coesum.it · Rapid prototyping processes There are numerous rapid...

Page 1: The rapid prototyping process - coesum.it · Rapid prototyping processes There are numerous rapid prototyping processes, here is a summary table: Process Description Resistance Finish

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The rapid prototyping

process

Page 2: The rapid prototyping process - coesum.it · Rapid prototyping processes There are numerous rapid prototyping processes, here is a summary table: Process Description Resistance Finish

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Index

Rapid prototyping processes

Three-dimensional printing (3DP)

Three-dimensional printing (3DP): Pros and Cons

Selective laser sintering (SLS)

Selective laser sintering (SLS): pros and cons

Stereolithography (SLA)

Stereolithography (SLA): Pros and Cons

Fused deposition modeling (FDM)

Fused deposition modeling (FDM): Pros and Cons

Computerized Numerical Control Processing (CNC)

Computerized Numerical Control (CNC) Processing: Pros and Cons

Page 3: The rapid prototyping process - coesum.it · Rapid prototyping processes There are numerous rapid prototyping processes, here is a summary table: Process Description Resistance Finish

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Rapid prototyping processes

There are numerous rapid prototyping processes, here is a summary table:

Process Description Resistance Finish

Three-dimensional printing (3DP) UV photopolymer jet printing

Low Additive layers in general of 0.089 - 0.203 (mm)

Selective laser sintering (SLS) Laser sintering of powders 5,300 - 11,300 (psi) 36.5 -77.9 (mpa)

Additive layers in general of 0.102 (mm)

Stereolithography (SLA) Laser light photopolymerization

2,500 - 10,000 (psi) 17.2 -68.9 (mpa)

Additive layers typically 0.051 - 0.152 (mm)

Fused deposition modeling (FDM) Cast extrusions 5,200 - 9,800 (psi) 35.9 -67.6 (mpa)

Additive layers typically 0.127 - 0.330 (mm)

Computerized Numerical Control Processing (CNC)

Milling using CNC milling machines

3,000 - 20,000 (psi) 20.7 -137.9 (mpa)

Surface milled with subtractive technique (smooth)

Page 4: The rapid prototyping process - coesum.it · Rapid prototyping processes There are numerous rapid prototyping processes, here is a summary table: Process Description Resistance Finish

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Three-dimensional printing (3DP)

It works like a jet printer. The

heads move on a bed of dust

releasing micro drops of liquid

that will allow the solidification

of the powder only in the

selected areas. The process is

repeated layer by layer until the

piece to be produced is

completed. At the end of the

cycle the piece is extracted from

the process chamber and the

powder is removed.

Page 5: The rapid prototyping process - coesum.it · Rapid prototyping processes There are numerous rapid prototyping processes, here is a summary table: Process Description Resistance Finish

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Three-dimensional printing (3DP): Pros and cons

PROS

Faster and more economical

additive process for prototyping.

Colored models can provide more

information and have a more

pleasant appearance.

The material is non-toxic plaster,

inexpensive and easily available.

The process is able to produce

parts with complex geometries.

CONS

The choice of materials is

not very wide.

The pieces are rough and

not very resistant.

It is useful for producing

pieces with complex

geometries, but does not

provide information on the

final feasibility of the

project.

The construction layers are visible to the naked eye.

Page 6: The rapid prototyping process - coesum.it · Rapid prototyping processes There are numerous rapid prototyping processes, here is a summary table: Process Description Resistance Finish

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Selective laser sintering (SLS)

It is based on the use of the laser, which

sinterizes the powdered material layer by

layer, from the bottom to the top. The

pieces made with selective laser sintering

can be precise and have a longer life

compared to the pieces made with

stereolithography, but the finish is fairly

coarse, grainy and sandy to the touch. A

reduced resistance is created between the

melted particles, so the pieces are more

delicate and compared to those

machined with CNC machines or injection

molded using the same type of material.

Furthermore, the number of available

powder materials is limited.

Page 7: The rapid prototyping process - coesum.it · Rapid prototyping processes There are numerous rapid prototyping processes, here is a summary table: Process Description Resistance Finish

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Selective laser sintering (SLS): Pros and cons

PROS

The pieces are precise

and show a longer life

compared to those made

with stereolithography.

The process makes it

possible to produce

pieces with complex

geometries.

CONS

The surface of the pieces is granular

/ sandy and usually not indicated for

functional testing due to reduced

mechanical properties.

Useful for producing pieces with

complex geometries, but does not

provide information on the final

feasibility of the project.

Page 8: The rapid prototyping process - coesum.it · Rapid prototyping processes There are numerous rapid prototyping processes, here is a summary table: Process Description Resistance Finish

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Stereolithography (SLA)

Additive production process; the

piece is made inside a tank

containing a resin sensitive to UV

radiation. With a computerized laser

the product is cured by building it

section by section on the surface of

the liquid resin. The process is

repeated until completion of the

particular, making adhere each new

polymerized layer to the underlying

layer. Stereolithography was the first

"rapid prototyping" technique.

Page 9: The rapid prototyping process - coesum.it · Rapid prototyping processes There are numerous rapid prototyping processes, here is a summary table: Process Description Resistance Finish

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Stereolithography (SLA): Pros and cons

PROS

For conceptual models or models to

be used as matrices for other

prototyping methods, such as casting

from a silicone mold and capable of

producing pieces with complex

geometries and excellent surface

finishes compared to other additive

processes.

The costs are very competitive and the

the technology is available from

numerous suppliers.

CONS

Prototypes are much more delicate than those

made with industrial resins, so they are not

suitable for performing functional tests.

Moreover, since the resin polymerizes with UV

light, exposure to sunlight causes the resin

polymerization process to continue and with

passage of time the pieces become more

fragile.

Useful for producing pieces with complex

geometries, but can not provide information on

the final feasibility of the project.

Page 10: The rapid prototyping process - coesum.it · Rapid prototyping processes There are numerous rapid prototyping processes, here is a summary table: Process Description Resistance Finish

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Fused deposition modeling (FDM)

Make the pieces from the bottom up

using a computerized print head. The raw

material of the process is an extruded

resin filament, which the machine

selectively re-creates and deposits on the

previous layer for each section of the

desired piece. The FDM process produces

parts in ABS or PC, which are therefore

more resistant than parts made with other

additive processes. However, it is possible

to obtain porous pieces, with evident

effects of scaling or ginning on the outer

surface, in particular at the junctions

between the layers. Furthermore, with this

process it can be difficult to achieve close

tolerances.

Page 11: The rapid prototyping process - coesum.it · Rapid prototyping processes There are numerous rapid prototyping processes, here is a summary table: Process Description Resistance Finish

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Fused deposition modeling (FDM): Pros and cons

PROS

The pieces are strong

enough and suitable for

some types of functional

testing.

The process is capable of

producing pieces with

complex geometries.

CONS

The surface finish of the piece is poor,

with a pronounced ginning effect.

Compared to SLA and SLS, it has longer

lead times.

It is useful for producing pieces with

complex geometries, but does not provide

information on the final feasibility of the

project.

Page 12: The rapid prototyping process - coesum.it · Rapid prototyping processes There are numerous rapid prototyping processes, here is a summary table: Process Description Resistance Finish

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Computerized Numerical Control Processing (CNC)

This method consists in fixing a block of

plastic or metal material on the CNC milling

machine, where it is processed in order to

obtain the final piece. The strength and

surface finish obtained are superior to those

of any additive process. There are also all the

homogeneous properties of the plastic

because the pieces are made of solid resin

blocks made specifically for this kind of

processing. The wide choice of materials

allows the pieces to be made with all the

properties of the chosen material.

Good tolerances make the parts suitable for

functional and assembly tests. The prototypes

can be delivered to the customer in a few

days, as for the additive processes. The

process removes the material rather than

adding it, so it can sometimes be difficult to

mill undercuts. Furthermore, milling tends to

be more expensive than additive processes.

Page 13: The rapid prototyping process - coesum.it · Rapid prototyping processes There are numerous rapid prototyping processes, here is a summary table: Process Description Resistance Finish

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Computerized Numerical Control (CNC) Processing: Pros and cons

PROS

Full mechanical strength of

the pieces as they use real

technical polymers and

metals.

CONS

There may be geometric limitations

with respect to additive processes,

moreover it typically involves higher

costs, associated with the greater

resources necessary to produce them.

Page 14: The rapid prototyping process - coesum.it · Rapid prototyping processes There are numerous rapid prototyping processes, here is a summary table: Process Description Resistance Finish

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For a FREE consultation on your project, write to our engineering team at

[email protected] or call us at 0871/250230, you will immediately have:

Answer within 24 hours

Within 24 hours of your request you will receive our quote for the production of rapid prototypes. Our technical

consultant will help you to give you an overview of available technologies and choose the solution closest to your needs.

The best prototyping technologies to achieve what you need while respecting your aesthetic, functionality, mechanical strength and much more.

FREE feasibility study included in the estimate

Our consultant will always carry out a prior analysis of the shared project to optimize the design according to the

production process. This will save you time, choose the technology that best suits your need and get the right

answers from the tests you will make on the prototype.

Conformity checks BEFORE shipment

Before proceeding with the shipment of your

order, our employee will check the details to

verify the geometry and the tolerance of the tolerances in accordance with what has been

announced in the estimation.

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