公开(公告)号：US20180065179A1

公开(公告)日：2018-03-08

申请号：US15120607

申请日：2016-01-21

Applicant: TECHNOLOGY RESEARCH ASSOCIATION FOR FUTURE ADDITIVE MANUFACTURING

Inventor： Kazuya GOTO

IPC: B22F3/105 ,  H01J37/305 ,  H01J37/302 ,  C22B9/22

CPC classification number: B22F3/105 ,  B22F3/1055 ,  B22F2003/1051 ,  B22F2003/1057 ,  B33Y30/00 ,  B33Y40/00 ,  B33Y50/02 ,  C22B9/228 ,  H01J37/1474 ,  H01J37/30 ,  H01J37/3023 ,  H01J37/305 ,  Y02P10/295

Abstract: Excessive evaporation of powder is prevented. A three-dimensional shaping apparatus includes an electron gun that generates an electron beam; a primary main deflector that deflects the electron beam one- or two-dimensionally; at least one lens that is provided between the electron gun and the primary main deflector and focuses the electron beam; a sub-deflector that is provided between the electron gun and the primary main deflector, deflects the electron beam one- or two-dimensionally, and has a deflection area smaller than the deflection area of the primary main deflector and the scanning speed higher than a scanning speed of the primary main deflector; and a controller that controls deflection directions and the scanning speeds of the primary main deflector and the sub-deflector. The primary main deflector moves the deflection area of the sub-deflector, and the sub-deflector performs multiple scanning and irradiation of small regions, in which scanning and irradiation the small regions are each included in the deflection area and scanned and irradiated with the electron beam for a predetermined number of times.

公开(公告)号：US20180166251A1

公开(公告)日：2018-06-14

申请号：US15123350

申请日：2016-03-25

Applicant: TECHNOLOGY RESEARCH ASSOCIATION FOR FUTURE ADDITIVE MANUFACTURING

Inventor： Zhixiong YUAN ,  Kazuya GOTO ,  Toshiyuki MORIMURA ,  Takahiro SHIMBO

IPC: H01J37/147 ,  H01J37/10 ,  H01J37/302 ,  H01J37/305 ,  B29C64/153 ,  B29C64/268 ,  B29C64/205 ,  B29C64/393 ,  B33Y30/00 ,  B33Y50/02 ,  B23K15/00 ,  B23K15/02

Abstract: This invention can maintain the temperature of the shaping plane in a three-dimensional layer-by-layer shaping apparatus. A three-dimensional layer-by-layer shaping apparatus includes a material spreader that spreads the material or materials of a three-dimensional layer-by-layer shaped object onto the shaping plane on which the three-dimensional layer-by-layer shaped object is to be shaped; an electron gun that generates an electron beam; at least one deflector that deflects the electron beam so that it scans the shaping plane one- or two-dimensionally; at least one lens that is positioned between the electron gun and the deflector, and focuses the electron beam; a focus controller that controls the focus of the electron beam based on which region is to be scanned by the electron beam; and a controller that controls the deflecting direction of the deflector and the scanning rate.

公开(公告)号：US20180339360A1

公开(公告)日：2018-11-29

申请号：US15546248

申请日：2016-12-16

Applicant: TECHNOLOGY RESEARCH ASSOCIATION FOR FUTURE ADDITIVE MANUFACTURING

Inventor： Kazuya GOTO

IPC: B23K15/00 ,  B33Y30/00 ,  B33Y50/02 ,  B22F3/105

Abstract: Excessive evaporation of powder is prevented. A three-dimensional shaping apparatus includes an electron gun that generates an electron beam, at least one deflector that deflects the electron beam one- or two-dimensionally, at least one lens that is provided between the electron gun and the deflector, and that focuses the electron beam, and a controller that controls the deflection direction and scanning speed of the deflector, the deflector scanning and irradiating the predetermined regions. The three-dimensional shaping apparatus further includes a controller that controls the cross-sectional diameter of the electron beam. The process step of melting the powder is divided into two process steps, namely the first melting step and the second melting step in the sequential order of the process steps. In the first melting step, the powder is given the amount of unit-area heat necessary to raise the temperature of the powder from its preheating temperature to its melting point. In the second melting step, the powder is given the amount of unit-area heat equal to or larger than the amount of unit-area heat necessary for the powder to melt by receiving its melting heat. In the second melting step, furthermore, the cross-sectional diameter of the beam is increased so that the powder is given a smaller amount of unit-area amount of unit-area power of the electron beam in the second melting step than in the first melting step.

公开(公告)号：US20180015565A1

公开(公告)日：2018-01-18

申请号：US15120643

申请日：2015-12-07

Applicant: TECHNOLOGY RESEARCH ASSOCIATION FOR FUTURE ADDITIVE MANUFACTURING

Inventor： Kazuya GOTO

IPC: B23K15/00 ,  B23K15/02

CPC classification number: B23K15/0086 ,  B22F3/1055 ,  B22F2003/1056 ,  B23K15/002 ,  B23K15/02 ,  B29C64/153 ,  B29C64/268 ,  B29C64/393 ,  B33Y30/00 ,  B33Y50/02 ,  Y02P10/295

Abstract: Overheating of and unintended melting of powder is suppressed, and thus the shaping accuracy is improved. A three-dimensional shaping apparatus includes an electron gun that generates an electron beam, at least one primary deflector that deflects the electron beam one- or two-dimensionally, at least one lens that is provided between the electron gun and the primary deflector and focuses the electron beam, a secondary deflector that is provided between the electron gun and the primary deflector, and deflects the electron beam one- or two-dimensionally, and a controller that controls the deflection directions and scanning speeds of the primary deflector and the second deflector. The controller controls the deflection direction and scanning speed of the second deflector while the scanning speed of the primary deflector is lower than a predetermined speed.