Abstract: Apparatus for processing a sheet-metal workpiece includes a press tool including a bottom die and top die. A press includes a platen which receives the bottom die, and a ram which receives the top die. The press tool is protected by a protective system which detects an idle stroke and includes an adjustable spacer assembly to prevent collision between the top and bottom dies.

Abstract: A manufacturing process of a hot stamped coated part comprising the following successive steps, in this order: providing a hot rolled or cold rolled steel sheet comprising a steel substrate and an aluminium-silicon alloy precoating, the precoating containing more than 50% of free aluminium and having a thickness comprised between 15 and 50 micrometers, then cutting the steel sheet to obtain a precoated steel blank, then heating the blank under non protective atmosphere up to a temperature Ti comprised between Te?10° C. and Te, Te being the eutectic or solidus temperature of the precoating, then heating the blank from the temperature Ti up to a temperature Tm comprised between 840 and 950° C. under non protective atmosphere with a heating rate V comprised between 30° C./s and 90° C.

Abstract: Apparatus for processing a sheet-metal workpiece includes a press tool including a bottom die and top die. A press includes a platen which receives the bottom die, and a ram which receives the top die. The press tool is protected by a protective system which detects an idle stroke and includes an adjustable spacer assembly to prevent collision between the top and bottom dies.

Abstract: A manufacturing process of a hot stamped coated part comprising the following successive steps, in this order: providing a hot rolled or cold rolled steel sheet comprising a steel substrate and an aluminium-silicon alloy precoating, the precoating containing more than 50% of free aluminium and having a thickness comprised between 15 and 50 micrometers, then cutting the steel sheet to obtain a precoated steel blank, then heating the blank under non protective atmosphere up to a temperature Ti comprised between Te?10° C. and Te, Te being the eutectic or solidus temperature of the precoating, then heating the blank from the temperature Ti up to a temperature Tm comprised between 840 and 950° C. under non protective atmosphere with a heating rate V comprised between 30° C./s and 90° C.

Abstract: Procedure to operate a combustion motor in the event of damage, whereby the thermoelectric voltage of a lubricant interruption on parts moving relative to each other and made of different, electrically conducting materials, is used to initiate an alarm signal, in that upon the appearance of such an alarm signal at least one operating parameter of the combustion engine is changed until the alarm extinguishes and the combustion motor is then further operated in a reduced operational state.

Abstract: Procedure to operate a combustion motor in the event of damage, whereby the thermoelectric voltage of a lubricant interruption on parts moving relative to each other and made of different, electrically conducting materials, is used to initiate an alarm signal, in that upon the appearance of such an alarm signal at least one operating parameter of the combustion engine is changed until the alarm extinguishes and the combustion motor is then further operated in a reduced operational state.

Abstract: A method is provided for restoring geometrically complex components having damage or defects in regions of limited access, in which damaged or defective pieces are cut out of the components and replacement pieces of the same kind are welded in, the cutting and the welding being performed with the aid of laser energy. Using a CNC-controlled laser beam, a damaged or defective piece is cut out of a component. Using a laser beam and the same path data, modified by a correction if necessary, a replacement piece is cut out of a repair part. Using a laser beam and the same path data as in A, the replacement piece is welded into the component. A space-saving special adapter is used in the three foregoing machining steps. During the first three machining steps, the component remains in the same clamped support.

Abstract: A smelting furnace system for smelting metals, especially steel scrap, with a lower furnace vessel, in the bottom of which a tap hole is provided, and with an upper furnace vessel, which can be closed by a cover, in which a central pipe is provided coaxially with respect to the main axis of the furnace, in which pipe at least one electrode is arranged, and on which pipe there is provided a component which encompasses the upper furnace vessel and can be connected to a gas offtake device. In this arrangement, a slit is provided in the wall of the central pipe in a longitudinal direction. A sleeve is fastened at the edge of the slit, allowing the central pipe to be fastened to the casing of the upper furnace vessel having a corresponding slit. Furthermore, a supporting arm, which is connected to a supporting pillar arranged outside the furnace, can be led through the hollow space of the sleeve into the central pipe, with at least one electrode fastened on the front face of this arm.

Abstract: A process for operating a double furnace installation having two arc furnaces connected via a line, a power supply, a device for charging material, and an arrangement for extraction and purification of gas. The process including the step of connecting a first one of the two furnaces with the power supply for melting a charge located therein, completely cutting off a second one of the furnaces from the power supply. The second furnace is then charged with charging material and is closed with a cover. Flue gas located in the closed second furnace is sucked out above the burden column and flue gas is sucked out of the first furnace above the surface of the melted charge through the second furnace via the connection line provided between the two furnaces. A flue gas connection of the first furnace to the gas purification arrangement is interrupted while the flue gas is being sucked out of the second furnace while feed air is simultaneously taken on in the region of a cover of the first furnace.

Abstract: A steelworks apparatus includes a closed tiltable arc furnace for melting scrap and having a lower vessel part for containing the melt and an upper vessel part connected to an exhaust gas assembly and closed by a furnace roof. A sealable charging assembly is formed of at least two stack-like storage containers which are connected at their top ends to the exhaust assembly and which include gas-permeable, scrap-retaining flaps that are movable between open and closed positions at the bottom end of each respective storage container. A compensation component is located connectingly between the storage containers and the lower furnace vessel part for accommodating relative movements of and between the furnace and storage containers while gas-tightly preventing leakage or escape of gases from between the relatively moved or shifted structures during or as a result of operative tilting of the furnace.

Abstract: This invention relates to an electrode positioning mechanism of an electric, electric arc or reduction furnace, in particular for smelting steel, with a guide column, having a mast arm to hold the electrode and guided in a guide frame by front and lateral guide rollers, which are located in a nest, and which can be moved vertically, whereby there are mechanical damping elements to damp mechanical vibrations. To create an electrode positioning mechanism which uses simple means to achieve a vibrational isolation of the individual components of the electrode positioning mechanism, and which reduces the breakage of electrodes in comparison to the devices of the prior art which use complex damping means, the invention proposes that the damping elements 14 be located between the front and lateral guide rollers 6 and the guide frame 7.

Abstract: A hoisting mechanism for handling the cover of an electric arc furnace comprises a pivotable gantry base and gantry arms connected thereto which extend over the furnace cover. Traverse bars overlay the gantry arms and are connected to the furnace cover by hoisting rods which pass through the gantry arms. Lifting mechanisms preferably in the form of hydraulic piston-cylinder arrangements are secured, on one end, to the gantry arms and, on the other end, to the lower side of the traverse bars. The mechanism is electrically insulated to eliminate deterioration of the equipment and the existence of electrical circuits and, in addition, the hoisting rods and the piston cylinder mechanisms are water-cooled.