Abstract: The disclosure provides for cleaning three-dimensional (3D) components printed in a powder bed from adhering powder particles. The 3D-printed components are cleaned with a negative pressure-induced volumetric flow. The 3D-printed components are first removed from the powder bed after their manufacture, then positioned on a feed device and moved together with the feed device into a pressure-tight sealable chamber. In the interior of the chamber negative pressure is subsequently built up and a fluid volumetric flow is applied to the 3D-printed component to be cleaned which results in the powder particles being detached from the 3D-printed component. The powder particles are removed from the sealed chamber in a pressure tight manner via at least one channel conduit which is subjected to negative pressure and are fed to a separation device. The chamber is subsequently released of pressure and then opened for removal of the cleaned 3D-printed component.

Abstract: The position of the molding geometry of an assembled mold relative to a CAD data set is determined so the dimensional accuracy of the cast part to be produced can be evaluated. The position of the molding geometry of a first mold part is measured and compared to a desired position according to a CAD data set. The position is adjusted to optimally adapt it to within tolerances. The first mold part is maintained in its adjusted position while the position of the molding geometry of a second mold part is measured and compared to a desired position according to the CAD data set. The position of the second mold part is adjusted to optimally adapt it to within tolerances. Thereafter, the mold parts are fixed together with a curable molding material deposited into spaces in the mold parts that is allowed to harden.

Abstract: A method for producing a casting mold from a composite mold material for foundry purposes that is composed of different kinds of mold materials that are heat-resistant for the casting of metals and that differ in substantive composition or have different contents of organic or inorganic binders. A solid mold body is prepared from a foundry mold material A that is completely or partially encased during its preparation with a free-flowing chemically bonded foundry mold material B. A composite mold material block is formed after the hardening of the foundry mold material B, which is then machined by a cutting method such as milling, boring, turning, or grinding. The mold cavity is introduced into the mold body consisting of the foundry mold material A, and the inflow system and the feed system are introduced into the mold material block consisting of the foundry mold material B, using CAD data.

Abstract: A rustproof austenitic cast steel part having tensile strength greater than 550 MPA and elongation at break over 30%, is characterised in that the cast steel having an aluminium content of 0 to 4% and a silicon content of 1 to 4% is within an alloying range that is determined by the coordinates of four points (Crequiv.=14; Niequiv.=8), (Crequiv.=14; Niequiv.=14), (Crequiv.=22; Niequiv.=8) and (Crequiv.=22 Niequiv.=16), wherein the chromium and nickel equivalents are calculated from the chemical composition of a cast steel using the relations (1) and (2): Cr equiv . = % ? ? Cr + % ? ? Mo + 1.5 ? % ? ? Si + 0.5 ? % ? ? W + 0.9 ? % ? ? Nb + 4 ? % ? ? A ? ? 1 + 4 ? % ? ? Ti + 1.5 ? % ? ? V + 0 ? .9 ? % ? ? Ta ( 1 ) Ni equiv . = % ? ? Ni + 30 ? % ? ? C + 18 ? % ? ? N + 0.5 ? % ? ? Mn + 0.3 ? % ? ? Co + 0.2 ? % ? ? Cu - 0.

Abstract: A method for producing a casting mold from a composite mold material for foundry purposes that is composed of different kinds of mold materials that are heat-resistant for the casting of metals and that differ in substantive composition or have different contents of organic or inorganic binders. A solid mold body is prepared from a foundry mold material A that is completely or partially encased during its preparation with a free-flowing chemically bonded foundry mold material B. A composite mold material block is formed after the hardening of the foundry mold material B, which is then machined by a cutting method such as milling, boring, turning, or grinding. The mold cavity is introduced into the mold body consisting of the foundry mold material A, and the inflow system and the feed system are introduced into the mold material block consisting of the foundry mold material B, using CAD data.

Abstract: The invention relates to a method for producing heat-resistant casting molds from molding sand containing binder, particularly for producing an inner contour of casting molds for prototypes, large volumes and deep grooves often being produced especially in the machining of molds for rapid production of prototypes from casting materials. To increase efficiency, in a first step blocks of molding material are produced whose dimensions correspond to a mold cavity depth typically of 300 mm to 400 mm. The inner contour of the mold is then produced oversized with spacing close to the contour of the inner wall of the mold cavity by means of a roughing tool (4) that has an effective cutting diameter of 12 mm to 35 mm. The mold cavity is then machined by fast milling away of the oversize material following the contour, with a finishing cutter (3) that has a diameter-to-length ratio between 1:10 and 1:30.

Abstract: A shank-end tool is described that is simple and economical to manufacture, with permanently attached wing-like inserts for the milling-type machining of chipless materials that remains functional with unavoidable frictional wear and with increasing erosion. The shank-end tool is characterized by a shank (1) rotatable around its longitudinal axis (2) that can be connected detachably to a drive device and is provided at its free end section (6) with at least one groove-shaped recess (7) extending in the axial direction and one flat cutter blade (8), which is provided with a non-cutting blade edge (12) on its leading face viewed in the direction of advance (9). The shank-end tool is used for the manufacture of molds, especially heat-resistant casting molds for the production of metal castings.

Abstract: A method is described for uphill casting in sand molds with high-resin casting cores or especially casting cores containing binders, and with directed solidification of metallic castings that have at least one cavity. In particular, these are prototypes of engine blocks or cylinder heads, for example for internal combustion engines that are provided with a cavity through which coolant water flows. To provide for low-turbulence flow of the liquid molten metal during the deaeration of the casting mold, the casting mold is provided with at least one feeder head that is connected through a casting system to an infeed funnel, and the molten metal it contains is displaced by gravity through the casting system into the casting mold, with the cavity in the molten metal being subjected after the filling to reduced pressure that is greater than the pressure of the core gases formed in the core. This eliminates the hindrance to filling the mold from air pockets in the mold.

Abstract: The invention is directed to a method for directly producing a lost mold by machining a sand mold made with curable binders. The invention is intended in particular to decrease tool wear and to increase dimensional accuracy and exactness in the reproduction of the mold, in that a mold blank (1) to be machined is constructed by means of a pattern set (4) with the use of a variable or fixed molding box (2) and includes in its volume the desired contours of the casting mold and a machining allowance for the milling of the mold material. After filling of the molding box (2) with curable foundry mold materials, curing, and removal from the mold, the mold blank (1) is transformed into the casting mold by removal of the machining allowance by high-speed machining, milling or 3-D machining of freeform surfaces. The invention concerns lost molds for metal castings and the fabrication of casting prototypes and odd parts in the range of small-and medium-sized articles and production runs.