3 METHOD FOR PRODUCING THREE-DIMENSIONAL MOLDED ARTICLE

• Main Authors: ABE SATOSHI, MATSUMOTO ISAMU, TAKENAMI MASATAKA
• Format: Patent
• Language: English; Korean
• Published: 25.10.2016
• 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; CASTING; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; PERFORMING OPERATIONS; POWDER METALLURGY; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING METALLIC POWDER; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

"3차원 형상 조형물의 윤곽부에 상당하는 부분"의 융기를 줄일 수 있는 분말 소결 적층법을 제공한다. 본 발명의 제조 방법은, (ⅰ) 분말층의 소정 개소에 광 빔을 조사하여 상기 소정 개소의 분말을 소결 또는 용융 고화시켜 고화층을 형성하는 공정, 및, (ⅱ) 얻어진 고화층의 위에 새로운 분말층을 형성하고, 그 새로운 분말층의 소정 개소에 광 빔을 조사하여 고화층을 더 형성하는 공정에 의해 분말층 형성 및 고화층 형성을 교대로 반복하여 행하고, 광 빔의 주사를, 3차원 형상 조형물의 윤곽부에 상당하는 부분을 광 빔 조사하기 위한 광 빔 주사 A와, 윤곽부보다 안쪽이 되는 3차원 형상 조형물의 내부 영역부에 상당하는 부분을 광 빔 조사하기 위한 광 빔 주사 B로 나누고 있고, 윤곽부에 상당하는 부분에 대한 광 빔의 피크 파워 P가 내부 영역부에 상당하는 부분에 대한 광 빔의 피크 파워 P보다 낮아지도록, 광 빔 주사 A와 광 빔 주사 B의 사이에서 상대적으로 피크 파워 P를 조정한다. There is provided a selective laser sintering method capable of reducing the bulge of the peripheral portion corresponding to the periphery of the three-dimensional shaped object. The manufacturing method according to an embodiment of the present invention includes alternate repetition of a powder-layer forming and a solidified-layer forming, the repetition comprising: (i) forming a solidified layer by irradiating a predetermined portion of a powder layer with a light beam, thereby sintering the powder in the predetermined portion or a melting and subsequently solidifying the powder; and (ii) forming another solidified layer by newly forming a powder layer on the formed solidified layer, followed by irradiation of a predetermined portion of the newly formed powder layer with the light beam, wherein a scanning of the light irradiation is divided into light beam-scannings "A" and "B", the light beam-scanning "A" being for the light irradiation of a peripheral portion corresponding to a periphery of the three-dimensional shaped object, the light beam-scanning "B" being for the light irradiation of an internal portion corresponding to a region of the three-dimensional shaped object, the region being located inside the periphery, and wherein a relative adjustment of a peak power "P" between the light beam-scannings "A" and "B" is performed such that a peak power P A of the light beam for the peripheral portion is lower than a peak power P B of the light beam for the internal portion.