摘要:
A process for three-dimensional modeling in which an alkali-soluble thermoplastic material is used in an additive deposition process to form a soluble support structure (28) for a three-dimensional object (26) under construction. The alkali-soluble thermoplastic material includes a base polymer of carboxylic acid and a plasticizer. Following formation, the object (26) is placed in an alkaline bath to dissolve the support structure (28). The alkali-soluble material can be used to form an alkali-soluble three-dimensional object (26).
摘要:
Disclosed is a method and apparatus for making a prototype injection molded part. An extruder of the type used for fused deposition modeling injects production thermoplastic material into a heated nonconductive plastic mold tool slowly at low pressure in an isothermic process. The mold tool may be built from a CAD drawing by fused deposition modeling or another rapid prototyping technique. Using the present invention, an injection molded prototype part can be made from a digital representation of the part within 24 hours by an engineer in an office environment.
摘要:
A three-dimensional model (26) and its support structure (28) are built by fused deposition modeling techniques, wherein a thermoplastic material containing silicone is used to form the support structure (28) and/or the model (26). The silicone acts as a release agent to facilitate removal of the support structure from the model after its completion. The thermoplastic material containing silicone exhibits good thermal stability, and resists build-up in the nozzle (24) of an extrusion head (12) or jetting head of a three-dimensional modeling apparatus (10).
摘要:
Disclosed are a filament cassette and a filament cassette receiver for supplying filament in a three-dimensional deposition modeling machine. The filament cassette contains a rotatable spool of filament, and has an exit orifice through which a filament strand may exit the cassette. The filament cassette receiver is mounted in a loading bay of the modeling machine and receives the filament cassette. The filament cassette receiver has a conduit for receiving a strand of filament from the cassette and a drive means for advancing the filament strand through the conduit. The present invention provides a convenient manner of loading and unloading filament from the modeling machine, and can be implemented in a manner that will protect the filament from moisture in the environment.
摘要:
Disclosed is a modeling filament (20) for use as feedstock in a fused deposition modeling liquifier (22), and a method for manufacturing the filament (20). The diameter and standard deviation of the filament (20) are controlled to meet various tolerance requirements of jam resistance, slip resistance, model strength, liquifier overflow prevention and hysteresis-free transient response. Standard deviation of the filament diameter is matched to a filament target diameter. The resulting filament (20) is used to form high-quality models.
摘要:
Disclosed are high-performance thermoplastic materials used in building a three-dimensional model and its supports, by fused deposition modeling techniques. A modeling material used to build a model (26) is comprised of a thermoplastic resin having a heat deflection temperature of greater than 120°C. An amorphous thermoplastic resin which self-laminates, bonds weakly to the modeling material, has a heat deflection temperature similar to the heat deflection temperature of the modeling material, and has a tensile strength of between 34 MPa [5000 psi] and 83 MPa [12,000 psi] comprises a support material used to build a support structure (28). In a preferred embodiment the thermoplastic resin comprising the support material is selected from the group consisting of a polyphenylene ether and polyolefin blend, a polyphenylsulfone and amorphous polyamide blend and a bolyphenysulfone, polysulfone and amorphous polyamide blend.
摘要:
Disclosed is a method for smoothing the surface of an object built from a polymeric or wax material using a layered manufacturing rapid prototyping technique. After the object is built it is exposed to a vaporized solvent such as in a vaporizer for an exposure time sufficient to reflow the object surface. A solvent is chosen based on its ability to transiently soften the material which forms the object, and thereafter evaporate off the object. The object is removed from the solvent and allowed to dry, producing a smooth finished part.