Technology Research Association for Future Additive Manufacturing

National Institute of Advanced Industrial Science and Technology

Cmet Inc.

Akashi Gohdoh Inc.

Toshimitsu Okane

Takeshi Kobayashi

Yoshikazu Ooba

Koukichi Suzuki

Yuya Daicho

Yousuke Katou

Hideaki Miyano

Toru Maruyama

Satoshi Imamura

Yasuhiro Nagai

Kosuke Takeshita

Makoto Yoshida

Satoshi Kajino

Katsuyuki Funaki

Iwao Akashi

Yuichi Motoyama

Yoya Fukuda

The present invention is a granular material that can be well recoated regardless of the type of the granular material, and enables a refractory aggregate in an unprinted portion to be used without any regeneration process, in the manufacture of a three-dimensional laminated and shaped mold. This granular material is a granular material for use in three-dimensional laminated mold shaping, and obtained by adding a material that causes a hydration reaction having a moisture absorbing function and generates a catalytic effect to a coating material mixed with or coated with an acid as a catalyst which activates and hardens an organic binder for binding the granular material.

Granular material, granular material manufacturing method, three-dimensional laminated and shaped mold manufacturing apparatus, and three-dimensional laminated and shaped mold manufacturing method

The present invention provides a three-dimensional molding device which makes it possible to reduce molding time by decreasing the inkjet head waiting time during the molding step. A three-dimensional molding device for scattering and layering sand on a molding table () using a recoater (), discharging a binder from a head () so as to coat the top of the scattered sand with the binder, on the basis of molding data, and creating a three-dimensionally molded article by joining the sand (S) using the binder, wherein: the recoater () is formed so as to have an amount of sand (S) equivalent to the length of one side of the molding table () as the scatterable length thereof, and be capable of moving in a direction perpendicular to the one side; the head () is formed as a line head capable of discharging an amount of the binder equivalent to the length of a side adjacent to the one side, and so as to be capable of moving in a direction perpendicular to the side adjacent to the one side; and the three-dimensionally molded article is formed on the molding table () by alternatingly operating the recoater () and the head ().

Three-dimensional molding device

In order to well perform recoating regardless of the type of granular material and reuse a refractory aggregate in an unprinted portion without any regeneration process in the manufacture of a three-dimensional lamination-shaped mold, this invention provides a granular material for use in shaping a three-dimensional laminated mold, which is coated with an acid as a catalyst which activates and cures an organic binder for binding the granular material. The acid contains at least one of sulfuric acid, phosphoric acid, a sulfonic acid and a carboxylic acid, and is one of a mixture of sulfuric acid and another acid, phosphoric acid only, a mixture of phosphoric acid and another acid, sulfonic acid only, a mixture of sulfonic acid and another acid and a mixture of a carboxylic acid and another acid.

Organic binder, granular material, three-dimensional lamination-shaped mold manufacturing apparatus, and three-dimensional lamination-shaped mold manufacturing method

Growing community of inventors

Tsukuba, Japan

Toshimitsu Okane