JP2018080356A5

JP2018080356A5 -

Info

Publication number: JP2018080356A5
Application number: JP2016222081A
Authority: JP
Filing date: 2016-11-15
Publication date: 2019-09-05
Anticipated expiration: 2036-11-15

Description

造形後の造形物の表面の凹凸の例を図９、１０、１１に示す。図は造形物表面の断面の模様である。横方向は表面に平行方向で縦方向がそこでの凹凸の様子になる。図９は積層造形時の中央ビーム軸２５に平行な面、図１０は中央ビーム軸２５に直交する面、図１１は電子ビーム照射側に対して裏側の面である。それぞれの表面粗さは、Raは
積層造形工程の中央ビーム軸２５に平行な面 29μｍ
積層造形工程の中央ビーム軸２５に直交する面 9μｍ
積層造形工程の電子ビーム照射側に対して裏面 27μｍ
程度であった。このように、積層造形時の中央ビーム軸２５に平行な面において、積層方向にそって連続した凸、あるいは連続した凹が発生することが多い。 Examples of irregularities on the surface of the modeled object after modeling are shown in FIGS. The figure shows a cross-sectional pattern on the surface of the model. The horizontal direction is parallel to the surface and the vertical direction is uneven. 9 is a surface parallel to the central beam axis 25 during additive manufacturing, FIG. 10 is a surface orthogonal to the central beam axis 25, and FIG. 11 is a surface on the back side with respect to the electron beam irradiation side. Each surface roughness Ra is 29 μm parallel to the central beam axis 25 in the additive manufacturing process
9 μm perpendicular to the central beam axis 25 in the additive manufacturing process
Back side 27μm for electron beam irradiation side of additive manufacturing process
It was about. As described above, a continuous protrusion or a continuous recess is often generated along the stacking direction on a surface parallel to the central beam axis 25 at the time of additive manufacturing.

１電子銃（第１の電子銃）、２電子ビーム（第１の電子ビーム）、３電子ビーム照射室（第１の電子ビーム照射室）、４造形ボックス、５昇降ステージ、６金属粉末、７給粉機、８造形物、８１一次造形物、８２二次造形物、１１金属粉末除去室、１２ジェットノズル、２１電子銃（第２の電子銃）、２２電子ビーム（第２の電子ビーム）、２３電子ビーム照射室（第２の電子ビーム照射室）、２５積層造形工程の中央ビーム軸、２６表面処理工程の中央ビーム軸、７６溶融池、１００電子ビーム照射機（第１の電子ビーム照射機）、１１０電子ビーム照射機、３００電子ビーム照射機（第２の電子ビーム照射機、１５０積層槽、２００金属粉末除去機、１０２第１のゲート、１０３ゲート、２０３第２のゲート、

1 electron gun (first electron gun), 2 electron-beam (first electron beam), three electron beam irradiation chamber (first electron beam irradiation chamber), 4 modeling box, 5 temperature descending stage, 6 Metal powder 7 Powder feeder , 8 Modeled object, 81 Primary modeled object, 82 Secondary modeled object, 11 Metal powder removal chamber, 12 Jet nozzle, 21 Electron gun (second electron gun), 22 Electron beam (second electron Beam), 23 electron beam irradiation chamber (second electron beam irradiation chamber), 25 central beam axis of additive manufacturing process, 26 central beam axis of surface treatment process, 76 molten pool, 100 electron beam irradiation machine (first electron) Beam irradiation machine), 110 electron beam irradiation machine, 300 electron beam irradiation machine (second electron beam irradiation machine, 150 stacking tank, 200 metal powder removal machine, 102 first gate, 103 gate, 203 second gate,

Claims

The metal powder spread in layers is spread on the metal solidified layer formed by irradiating the metal powder spread in layers with the first electron beam to melt the metal powder and then solidifying, and the first electron beam , And repeatedly forming a solidified metal solidified layer after the newly spread metal powder is melted, and a layered modeling process for forming a primary modeled solidified metal,
A metal powder removing step of forming a secondary shaped object by removing the metal powder adhering to the primary shaped object without solidifying in the layered shaping process;
A three-dimensional additive manufacturing method comprising: a surface treatment step of irradiating the secondary shaped object with a second electron beam to remelt the surface of the secondary shaped object to form a shaped object.

2. The three-dimensional additive manufacturing method according to claim 1, wherein the first electron beam is deflected to scan the metal powder spread in a layered manner to melt the metal powder. 3.

The direction of the central beam axis of the second electron beam with respect to the secondary shaped article is different from the direction of the central beam axis of the first electron beam with respect to the primary shaped article. The three-dimensional additive manufacturing method described in 1.

The angle formed by the central beam axis of the first electron beam with respect to the plane of the metal solidified layer and the angle formed by the central beam axis of the second electron beam with respect to the plane of the metal solidified layer. The three-dimensional layered manufacturing method according to claim 3, wherein the difference is an angle in the range of 90 degrees to 180 degrees.

By moving at least one of the second electron beam and the secondary structure, the second electron beam intersects the boundary line of the metal solidified layer on the surface of the secondary structure. The three-dimensional additive manufacturing method according to any one of claims 1 to 4, wherein the three-dimensional additive manufacturing method is performed by moving to the irradiation.

The said 2nd electron beam is scanned on the said secondary shaped article by deflecting, and the surface of the said secondary shaped article is remelted, The any one of Claim 1 to 4 characterized by the above-mentioned. 3D additive manufacturing method.

The width of the molten pool formed on the surface of the secondary modeled object by irradiation with the second electron beam in the thickness direction of the solidified metal layer formed in the layered modeling process is greater than or equal to a predetermined dimension. The three-dimensional additive manufacturing method according to any one of claims 1 to 6, wherein a parameter of the second electron beam is set so as to be.

The three-dimensional additive manufacturing method according to claim 7, wherein the preset dimension is twice the thickness of one layer of the solidified metal layer formed in the additive manufacturing step.

The three-dimensional additive manufacturing method according to claim 7 or 8, wherein the parameter of the second electron beam is a beam power.

The three-dimensional additive manufacturing method according to claim 7 or 8, wherein the parameter of the second electron beam is a beam diameter.

The second electron beam is an electron beam oscillated in a direction perpendicular to a beam axis, and the width of the molten pool is controlled by adjusting the width of the oscillation. 8. The three-dimensional additive manufacturing method according to 8.

The beam diameter of the second electron beam is at least twice the thickness of one layer of the solidified metal layer in the additive manufacturing process, according to any one of claims 1 to 6. Three-dimensional additive manufacturing method.

The three-dimensional additive manufacturing method according to any one of claims 1 to 6, wherein the second electron beam is an electron beam oscillated in a direction perpendicular to a beam axis.

A first electron beam irradiation chamber and a first electron gun are provided. In the first electron beam irradiation chamber, the metal powder spread in layers is irradiated with the first electron beam to melt the metal powder. A metal powder is spread on the metal solidified layer formed by post-solidification, and the first electron beam is irradiated to melt the newly spread metal powder, which is then solidified and solidified. A first electron beam irradiator that is controlled to form a primary shaped object in which the metal has solidified,
A metal powder removing machine provided with a metal powder removal chamber that removes the metal powder adhering to the primary modeled object without solidifying and uses the primary modeled article as a secondary modeled object;
A second electron beam irradiation chamber and a second electron gun are provided, and in the second electron beam irradiation chamber, the secondary shaped object is irradiated with a second electron beam to resurface the secondary shaped object. A three-dimensional additive manufacturing apparatus comprising: a second electron beam irradiator configured to melt and form a modeled article.

The first electron beam irradiation chamber and the metal powder removal chamber are connected via a first gate, and the metal powder removal chamber and the second electron beam irradiation chamber are a second gate. The three-dimensional additive manufacturing apparatus according to claim 14, wherein the three-dimensional additive manufacturing apparatus is connected to the three-dimensional additive manufacturing apparatus.

The first electron beam irradiation chamber and the second electron beam irradiation chamber are the same electron beam irradiation chamber, and the first electron gun and the second electron gun are the same electron gun. The three-dimensional additive manufacturing apparatus according to claim 14.

The three-dimensional additive manufacturing apparatus according to claim 16, wherein the electron beam irradiation chamber and the metal powder removal chamber are connected via a gate.

The direction of the central beam axis of the second electron beam with respect to the secondary shaped article is configured to be different from the direction of the central beam axis of the first electron beam with respect to the primary shaped article. The three-dimensional layered manufacturing apparatus according to any one of claims 14 to 17.

19. The three-dimensional additive manufacturing apparatus according to claim 14, wherein a beam diameter of the second electron beam is twice or more a thickness of one layer of the metal solidified layer. .

The three-dimensional additive manufacturing apparatus according to any one of claims 14 to 18, wherein the second electron beam is vibrated in a direction perpendicular to a beam axis.