| 摘要 |
A building cylinder arrangement (1) for a machine (70) for the layer-by-layer production of three-dimensional objects (71) by laser sintering or laser melting of powdered material (74), with a substantially cylindrical shell-shaped main body (2) and a piston (4) that can move on an inner side of the main body (2) along a cylinder axis (3) of the main body (2), wherein the piston (4) has on its upper side a substrate (21) for the growing of the three-dimensional objects (71), is characterized in that the main body (2) comprises a substantially cylindrical shell-shaped insulating body (5), which forms at least the inner side of the main body (2), wherein the insulating body (5) consists of a material with a specific thermal conductivity λικ, where λικ ≤ s 3 W/(m*K), in that the piston (4) is formed with an upper part (12) and a lower part (14), wherein the upper part (12) comprises the substrate (21), and wherein the lower part (14) has a cooling device (18), in particular a system of cooling water channels, and in that a first seal (20) of elastomer material is provided on the lower part (14) and is used to provide a gas-tight seal for the lower part (14) of the piston (4) with respect to the inner side of the main body (2). The invention proposes a building cylinder arrangement with which improved gas-tight sealing between the piston and the main body can be achieved even at high temperatures (for instance above 500°C). |
