摘要:
The invention relates to a device for machining a workpiece (5) that consists of metal, for example steel, using machining processes such as forming, press forming, drawing, spinning and cutting, and comprising the following features and components: - at least two tools (1-4) being provided; - a drive being associated with the tools (1-4) in order to move them for the purpose of carrying out the machining process; and - the drives being designed such that the tools have different speeds, at least in one section of their paths, as they pass along said paths.
摘要:
In order to achieve the simplest and most reliable possible detectability of the position and/or motion and/or thickness of a thin body (1), a device for detecting the position and/or motion and/or thickness of the thin body (1) made of ferromagnetic material, in particular a blank during the deep drawing of sheet metal, wherein the thin body (1) is arranged at least partially in a gap (4) formed between two bodies (2, 3) and can be moved in the longitudinal direction of the gap (4), wherein at least one of the two bodies (2, 3) has ferromagnetic properties, is designed in such a way that a magnet (8, 20) is associated with one of the two bodies (2, 3), wherein the magnet produces a magnetic field in the edge area of the body (2, 3) facing the thin body (1), that a magnetic field sensor (9) is provided in order to detect a change in the magnetic field distribution caused by the moving thin body (1), and that an evaluation unit is provided in order to evaluate the magnetic field sensor, by means of which evaluation unit a motion and/or position and/or thickness of the thin body (1) can be determined. A corresponding method is specified.
摘要:
A press forming method for a metal sheet is provided. The method is capable of improving a forming limit at which a crack appears in a metal sheet and being easily applied to a large press machine for mass production with a low cost, without correcting the shape of dies, such as a punch and an upper die, or changing the shape or material of a blank to a special shape or material. Dies, a surface roughness of which is an arithmetical mean roughness Ra of 7.5 µm or smaller, are used as a punch 10, an upper die 20, and a blank holder 30. Fluid with a kinematic viscosity of 500 mm 2 /s or lower (40°C) is used as a lubricant, and is supplied to a space between a metal sheet 100 and the blank holder 30, a space between the metal sheet 100 and the punch 10, and a space between the metal sheet 100 and the upper die 20. A die is detached from a workpiece in the middle of forming, and resuming the forming, thereby improving formability.
摘要:
Zur Erhöhung der Schnittqualität, insbesondere beim Stanzen hochfester martensitischer Werkstoffe oder auch beim Stanzen dicker Bleche, wird eine Blechhalteeinrichtung (2) vorgesehen, die das betreffende Werkstück (16) während des Stanzvorgangs fest einspannt. Die Spannkraft wird auf bis zu 40 % oder mehr Prozent der Stößelkraft erhöht. Insbesondere kann die von der Blechhalteeinrichtung (21) ausgeübte Kraft während des Werkstückdurchbruchs nochmals erhöht werden. Einerseits verbessert sich dadurch die Schnittqualität während sich andererseits eine effiziente Schnittschlagverhinderung an der Presse ergibt. Ein Schnittschlag ist wesentlich geschwächt oder tritt nicht auf.