Patent DE-102008012063-A1 (DE)
Title: Method for the production of hybrid molded part, comprises placing a contour mask on a base body, coating the surface of the mask and the body with a powdery material, and exposing the material to be applied in area wise manner
Inventor: HERZOG FRANK
IPC: B05D1/38
Filed: 2008-02-29
Abstract: The method comprises placing or positioning a contour mask on a machining or casting technically prefabricated base body (1), coating the surface of the contour mask and the base body with a powdery construction material (2), exposing the construction material to be applied in area wise manner, and twisting and/or lowering the base body. Molded part areawisely exists through a section produced through a laser melting process. The section is constructed generatively on the surface of the base body. The powder material is applied on the base body in layers. The method comprises placing or positioning a contour mask on a machining or casting technically prefabricated base body (1), coating the surface of the contour mask and the base body with a powdery construction material (2), exposing the construction material to be applied in area wise manner, and twisting and/or lowering the base body. Molded part areawisely exists through a section produced through a laser melting process. The section is constructed generatively on the surface of the base body. The powder material is applied on the base body in layers or on already hardened powder material bounded with the base body and is areawisely melted by the effect of the radiation energy in order to form the section or part of the section after hardening. The surface of the base body to be coated comprises a surface area that is arched towards top and is covered by a powder layer applied through a coater. The hardening is carried out through the radiation energy in the area in which arched surface area reaches until nearly under the plain surface of the powder layer. The surface area is formed uniformly convex as cylinder sleeve section, truncated cone section or conical surface section and is formed in dome or barreled form. The surface area is formed in point or line wise manner. The exposed surface areas are formed as strip like line section. The energy entry is brought in line section and the single line sections are arranged to each other in distanced or overlapped manner. The base body is sectionally rotated. A first line section of the base body is twisted after partial exposure. The additional line sections are arranged distanced from the first line sections. The base body is incorporated in a rotating holding device that enables twisting of the base body within a construction chamber. The base body is areawisely surrounded peripherally by the contour mask, which is released by a vertical relative movement between base body and the contour mask. The contour mask is arranged distanced from a carrier (3) and extends itself with its external edge area up to interior wall of the construction chamber. The external edge area of the contour mask is formed to the interior wall of the container in tightly sealing manner. The contour mask is areawisely supported by the prefabricated body, which is carried by the contour mask. The prefabricated body is arranged in a recess of the contour mask in such a way that that it is moved in a rotation- and/or translation degree of freedom. The contour mask is used in such a way that it is shifted with its edge areawisely surrounding the base body and mountable and movable to the external surface of the base body. The contour mask is adapted to the contour of different base bodies in stencil-like manner and is changed during the construction process with respect to its through-opening, which is adapted during the construction process steadily on the base body geometry and/or sectional geometry coiled on the base body. The contour mask consists of movable sections that are adapted itself in the pressure guidance to the base body. The contour mask consists of base mask with the recess in which an insertable connection insert is received. The contour mask, the carrier and/or powder bed (11) is equipped with a heating and/or cooling device that heats and/or cools during or before the construction process. The contour mask is adapted with its recess edge variable to different construction area geometry/size. In the contour mask, a base body holding device is arranged that is transported from a holding position into a releasing position for the base body. The contour mask is folded in areawise manner, is transported from a powder carrying position into a powder guiding position and is inclined to horizontals in the powder guiding position. The contour mask, the carrier and/or the powder bed is equipped with a vibration element (10) that is activated during or after the construction process. Suction elements are arranged at lockable openings of the contour mask, are connected with a powder reservoir and are activated during or after the construction process. The contour mask is used as packaging material component after reception of the three dimensional object from the construction chamber.