Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – To form particulate product
Patent
1991-03-15
1992-08-04
Powell, William A.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
To form particulate product
156378, 1563796, 156345, 21912173, 21912183, 4251744, B28B 1700, B29B 1300, B29C 3508
Patent
active
051356953
ABSTRACT:
A method and apparatus for selectively depositing a layer of material from a gas phase to produce a part comprising a plurality of deposited layers. The apparatus includes a computer controlling a directed energy beam, such as a laser, to direct the laser energy into a chamber substantially containing the gas phase to preferably produce photodecomposition or thermal decomposition of the gas phase and selectively deposit material within the boundaries of the desired cross-sectional regions of the part. For each cross section, the aim of the laser beam is scanned over a target area and the beam is switched on to deposit material within the boundaries of the cross-section. Each subsequent layer is joined to the immediately preceding layer to produce a part comprising a plurality of joined layers. In an alternate embodiment of the present invention, a gas phase is condensed on a surface and a laser beam is used to selectively evaporate, transform, activate or decompose material in each layer. The apparatus of the present invention preferably comprises a computer controlled laser generating and scanning system for selectively depositing or evaporating material to produce a part. The present invention further comtemplates an n-degree of freedom positioning apparatus for positioning a target outer layer and a detecting apparatus which can non-intrusively detect the position and thickness of the deposited layer, both of which are close looped into a computer to produce the desired part.
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Board of Regents , The University of Texas System
Powell William A.
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