Browse Prior Art Database

WOVEN MESH FOUNDATION

IP.com Disclosure Number: IPCOM000008502D
Original Publication Date: 1997-Dec-01
Included in the Prior Art Database: 2002-Jun-18
Document File: 3 page(s) / 176K

Publishing Venue

Motorola

Related People

Frank Garcia: AUTHOR [+3]

Abstract

The Stratasys Fused Deposition Modeling (FDM) system is a rapid prototyping technology which creates three-dimensional therm0 plastic models using an industry standard Computer Aided Design (CAD) stl-formatted file. The model's .stl tile is pre-processed by creating slice layers equal to the build layer thickness. These sliced layers are used to create an .sml-build file, which is transferred to the FDM machine. The model is fabricated on a Styrofoam foundation tray mounted on a Z-axis platform assembly that increments downward during the build process. A thermoplastic extruding device moves in two axes to complete each layer. This process of successively fusing each layer to the previous one continues until the model fabrication process is completed. The Styrofoam base and finished prototype are removed from the machine after fusing (or extruding) the last layer.

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m MOTOROLA Technical Developments

WOVEN MESH FOUNDATION

by Frank Garcia, Edwin D. Smith and Don Yeargan

BACKGROUND

  The Stratasys Fused Deposition Modeling (FDM) system is a rapid prototyping technology which creates three-dimensional therm0 plastic models using an industry standard Computer Aided Design (CAD) stl-formatted file. The model's .stl tile is pre-processed by creating slice layers equal to the build layer thickness. These sliced layers are used to create an .sml-build file, which is transferred to the FDM machine. The model is fabricated on

a Styrofoam foundation tray mounted on a Z-axis platform assembly that increments downward during the build process. A thermoplastic extruding device moves in two axes to complete each layer. This process of successively fusing each layer to the previous one continues until the model fabrication process is completed. The Styrofoam base and finished prototype are removed from the machine after fusing (or extruding) the last layer.

Stratasys Fused Deposition Modeler

This invention replaces the original Styrofoam it with a Woven Mesh Foundation fixture. build platform and foundation tray, and replaces

0 Motorola. ,"C ,997 139 December 1997

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MOTOROLA Technical Developments

8

Styrofoam Platform

INVENTION DESCRIPTION

  This invention utilizes a stretched woven mesh and fixture to resolve these two primary problems of adhesion and parallelism associated with the original design. In addition to resolving the existing problems, the new system offers additional benefits which improve model quality. The present device is using a stainless steel wire mesh, however, other materials may be used as well.

  The Woven Mesh Foundation consists of a tix- ture assembly and a replaceable mesh material. The fixture assembly includes a base plate, slides, slide locks, and screen mesh locks. The four slide locks are bolted to the base plate with two #IO-32 screws each. A screen locks is placed within each slide and secured with five #lo-32 screws each. The screen locks secure the woven mesh material and prevent movement when tension is applied to the mesh. The slides are interlocked with the slide locks and adjustment screws are utilized to apply tension to the woven mesh material. The result is a build foundation having a taught mesh surface which is parallel to the bottom of the fixture. This foundation is placed on the Z-axis platform within the build chamber.

PROBLEMS BEING ADDRESSED

  Typical materials used with the FDM machine include acrylonitrile butadiene styrene (ABS) and nylon, both of which have significant shrinkage
(0.005 to 0.015 in/in) while cooling from the ex...