Process for forming polymeric parts under vacuum conditions

• Main Authors: YANG LANTI, GU HAO, DAVIS SCOTT, HOCKER THOMAS
• Format: Patent
• Language: Chinese; English
• Published: 29.08.2017
• Subjects: ADDITIVE MANUFACTURING TECHNOLOGY; ADDITIVE MANUFACTURING, i.e. MANUFACTURING OFTHREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVEAGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING,STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

A system for fabricating a part (12) comprises a build chamber (14), a powder feed system (18) for feeding a polymeric powder (22) to the build chamber, a heating system (40) for melting and fusing the polymeric powder to form a fused polymeric part in the build chamber, and a vacuum system (50) to apply a specified vacuum pressure to the build chamber, wherein the vacuum pressure is at or below a threshold pressure so that a porosity of the fused polymeric part is at or below a specified threshold porosity. 种用于制造部件(12)的系统，包括构建室(14)，用于将聚合物粉末(22)进料到构建室的粉末进料系统(18)，用于熔融和融合所述聚合物粉末以在构建室中形成融合的聚合物部件的加热系统(40)，和将指定的真空压力施加到构建室的真空系统(50)，其中真空压力处于或低于阈值压力，使得融合的聚合物部件的孔隙率处于或低于指定的阈值孔隙率。