Patent ID: 8741194
Filing Date: 2014-06-03
Classification: B22C,B22F,B28B,B29C,B33Y,Y02P,Y10T

Abstract:
1. A method for producing a part layer-by-layer, comprising the steps of: a. depositing a layer of particulate matter having a particle size range from 90 μm to 200 μm into a building box having a movable building platform; b. applying a resinous binder to a predefined subarea of the layer so that the layer has treated particulate matter in the predefined subarea and untreated particulate matter outside of the predefined subarea; c. providing support to both the treated particulate matter and the untreated particulate matter by moving the movable building platform downward a given distance so that partial consolidation of the treated particulate matter is not required to prevent the treated particulate matter from flowing beyond the predefined subarea of the layer; d. repeating steps a. through c. for depositing additional layers over the previously deposited layer until a multi-layered part is complete, and e. curing the resinous binder in the part after step d. is complete by flooding or flowing a gas curing agent through the part; wherein no bonding step is provided per layer and bonding of the plurality of layers employs just one step at the end of the process; wherein the gas curing agent is selected from a group that consists of carbon dioxide, dimethylethylamine, triethylamine, sulphur dioxide, methylformiate, formaldehyde-dimethylacetate, or isocyanate, and wherein the steps of depositing the layer of particulate material and applying the resinous binder are done in the absence of an initiator.