摘要:
Die Erfindung betrifft ein Verfahren zum Fertigen eines hohlen Bauteils aus einem Werkstück mittels einer Presse mit mindestens einem Werkzeug und zwei Dichtstempeln zum Umformen des Werkstückes, wobei das Werkstück ein Metall und/oder eine Metalllegierung aufweist und als ein Hohlkörper mit zwei offenen Enden ausgebildet ist, mit folgenden Schritten - Erwärmen des Hohlkörpers, insbesondere oberhalb einer Härtetemperatur, - Einlegen des erwärmten Hohlkörpers in das Werkzeug, - Abdichten der beiden offenen Enden des Hohlkörpers mittels der beiden Dichtstempel, - Aufbau eines Gasdruckes mittels eines Gases innerhalb des Hohlkörpers, - Schließen des Werkzeuges und Pressen des erwärmten Hohlkörpers zum Umformen des erwärmten Hohlkörpers unter dem Gasdruck, - Unmittelbares Abkühlen des umgeformten Hohlkörpers im Werkzeug oder außerhalb des Werkzeuges, sodass ein höherfestes hohles Bauteil vorliegt, wobei der Aufbau des Gasdruckes bei geöffnetem Werkzeug erfolgt, sodass durch den Gasdruck ein Vorformen des erwärmten Hohlkörpers zeitlich vor dem Schließen des Werkzeuges erfolgt und/oder das Umformen des erwärmten Hohlkörpers beim Schließen des Werkzeuges unterstützt wird. Des Weiteren betrifft die Erfindung ein Bauteil und eine Presse zum Fertigen eines hohlen Bauteils.
摘要:
A process of mechanical hydroforming, in which a hollow tube is caused to expand against the interior surface of a die that surrounds the tube by hydraulic pressure applied to a liquid that fills the interior of the tube, is improved by coating the part of the exterior surface of the tube that comes into contact with the die surface against which it expands with a wax that is solid at normal room temperature but can be maintained fully melted and in contact with air, without showing any visible evidence of decomposition, at a temperature that is at least 75 DEG C. Preferably, the wax is applied to the surface to be hydroformed by spraying from melt onto the surface while the latter is maintained above the melt temperature of the wax. Shortly after the wax has been thus applied to the surface, the wax is cooled until it solidifies. Most preferably, the wax is an "oxidized hydrocarbon" wax that is about 95 % hydrocarbon and 5 % straight chain carboxylic acids and contains a wide variety of molecular weights of both hydrocarbons and carboxylic acids.
摘要:
The present invention relates to a method of manufacturing formed aluminium components. The method comprises the steps: i. Providing a hollow profile of aluminium or aluminium alloy, the profile having a predetermined length and comprising an outer wall having a pre-determined thickness; ii. Placing the hollow aluminium profile in a cavity of a bending tool and press bending the profile using the bending tool; and iii. Transferring the profile to a cavity of a forming tool and subjecting the interior of the profile to elevated gas pressure, whereby the section of the profile is distended until the outer wall of the profile abuts the forming tool, thereby providing a formed aluminium component; wherein the steps ii. and iii. are performed at a tool temperature of 350 - 470 °C. The present invention further relates to formed aluminium components manufactured by such a method.
摘要:
Provided herein is a high-speed blow forming process for shaping aluminum containers using 3xxx can body stock alloys with high recycled content, as well as articles made by that process. A process for shaping aluminum containers as described herein includes the sequential steps of blanking out a disk from a sheet of a 3xxx series aluminum alloy; forming a bottle preform by drawing, redrawing, ironing, and doming the disk; placing the preform into a mold cavity; applying an axial load to the preform; and injecting an inert gas into the interior of the preform with sufficient pressure until the preform expands to fill the mold cavity.
摘要:
A method of hydroforming a tubular structure of varying diameter along its longitudinal axis, comprising the formation of a tubular blank member by welding together, at their periphery, tubes of different diameters using electromagnetic pulse welding.
摘要:
The invention relates to a method for hydroforming a hollow profile (12) in a shaping tool. According to the inventive method, a fluid with a high pressure PI is passed into the hollow profile (12). Said hollow profile has a transitional zone of a varying wall thickness in the region of an edge (18 to 21) to be shaped. The inventive method is further characterized in that the shape of the hollow profile (12) is selected initially in such a way that starting from the edge (18 to 21) an enlargement (22 to 25) extends somewhat into the wall section (14, 16) of smaller wall thickness, thereby avoiding the formation of constrictions during shaping while obtaining favorable edge geometries.
摘要:
The invention relates to a method of producing an integrated monolithic aluminium structure, the method comprising the steps of: (a) providing an aluminium alloy plate with a predetermined thickness of at least 38.1 mm, wherein the aluminium alloy plate is a 2xxx-series alloy provided in a T3-temper and has a composition comprising, in wt.%: Cu 3.8-4.5, Mn 0.3-0.8, Mg 1.1-1.6, Si up to 0.15, Fe up to 0.20, Cr up to 0.10, Zn up to 0.25, Ti up to 0.15, Ag up to 0.10, balance aluminium; (b) optionally pre-machining of the aluminium alloy plate to an intermediate machined structure; (c) high-energy hydroforming of the plate or optional intermediate machined structure against a forming surface of a rigid die having a contour in accordance with a desired curvature of the integrated monolithic aluminium structure, the high energy forming causing the plate or the intermediate machined structure to conform to the contour of the forming surface to at least one of a uniaxial curvature and a biaxial curvature; (d) machining or mechanical milling of the high-energy formed structure to a near-final or final machined integrated monolithic aluminium structure; (e) ageing of the final integrated monolithic aluminium structure to a desired temper.
摘要:
Rather than using a conventional stamping forming process with steels having high ultimate tensile strength and relatively low initial yield, tubular hydroforming techniques are introduced to synergize with BIW part forming, or forming of other load bearing parts. Such steels can have ultimate tensile strengths of greater than 1000 MPa and initial yields of less than 360 MPa In some embodiments, the steels have elongation of at least 40%. Such steels can include retained austenite.