Application: Architecture

Chapter 1: Introduction to RP for architectural studies
Chapter 2: Introduction to Fused Deposition Modeling (FDM)
Chapter 3: Introduction to StereoLithography Apparatus (SLA)
Chapter 4: Introduction to Selective Laser Sintering (SLS)
Chapter 5: Introduction to Laminated Object Manufacturing (LOM)
Chapter 6: Introduction to 3D Printing (Concept Modeling)
Chapter 7: Alternative use of rapid prototyping
Chapter 8: RPD equipment/material manufacturers around the World

Introduction to Laminated Object Manufacturing (LOM)

CAD data goes into the Helisys LOM System's process controller and a cross-sectional slice is created by the LOM software. The CO² laser cuts the cross-sectional outline in the top layer and then cross-hatches the excess material for later removal. A new layer is bonded to the previously cut layer and a new cross section is created and cut as before. Once all layers have been laminated and cut, excess material is removed to expose the finished model.

The working principle of LOM

Advantages

• It is a relatively high speed process as the laser is only required to trace the contour and no need to scan the entire cross section. The more volume of material within the part, the more greater is the speed gain.
• Parts can be used immediately after the process and no post curing is required.
• No support structure is required as the part is supported by its own material.
• Simple to use and no environmental concern

Disadvantages

• Although there is some choice of materials including paper, plastic, ceramic and composite, the most commonly used material is only paper. Others are still under development.
• The built parts absorb moisture quickly resulting that the built parts must be post processed immediately and impregnating with epoxy that is specially designed for LOM technology, such as LOMPOXY
• Inherent deficiency in building fin-shape parts, in other words the process is restricted to build complex parts
• Since it is very difficult, if not impossible, to remove the waste materials from inside, the process is incapable of building reentrant shapes
• Fire hazard is occasionally happened when the working chamber becomes too hot

Application Areas

• Concept modeling

Because of the wooden-like characteristic of the built parts and the large machine working envelop, this process is most suitable for building pattern for sand casting.