Abstract: The device comprises a punch (2) of frustoconical shape and a die (1). The die comprises concentric rings (8, 9, 10) movable in the direction of the displacement of the punch, and pressure means (14, 15, 16) for exerting on the rings a predetermined force in the direction toward the punch, each of the annular front surfaces (20, 21, 13) of the rings having a shape which is complementary to the annular surface (20', 21', 13') of the punch in axially facing relation thereto.

Abstract: The present invention relates to a steel having improved weldability exhibiting good cracking resistance for high welding energies, good low-temperature toughness and requiring no preheating before welding.The composition by weight of the steel is the following:0.07 to 0.11% carbon,1.40 to 1.70% manganese,0.20 to 0.55% nickel,0 to 0.30% copper,0 to 0.02% niobium,0.005 to 0.020% titanium,0.002 to 0.006% nitrogen,0 to 0.15% silicon,the balance being iron.

Abstract: A method of continuously casting a liquid metal including the steps of providing an upper vessel and a lower vessel, providing a stream protection tube disposed between the upper vessel and the lower vessel, the stream protection tube being connected at an upper end thereof to a tap hole defined in a bottom portion of the upper vessel, the stream protection tube being open at a lower end thereof, at least one aperture being defined in a wall of the tube near the lower end. The method further includes disposing the upper vessel above the lower vessel, lowering the upper vessel until a lower portion of the tube disposed below the aperture is immersed in liquid metal contained in the lower vessel with the aperture being disposed above the liquid metal. Next, the tap hole is opened so that liquid metal disposed in the upper vessel flows into the stream protection tube, air contained in the tube is expelled through the aperture.

Abstract: The method forms a part in relief on a sheet metal blank (10) by means of a die and a punch. There are carried out on at least a localized zone of the blank (10 of FIG. 2), whose dimension exceeds the dimension of the part in relief, a preforming operation and a shaping operation resulting in the forming of the part in relief. In the course of the preforming operation, a succession of stepped undulations are progressively produced in an intermediate zone of the localized zone located between the future high part of the part in relief and the periphery of the localized zone, and, in the course of the shaping operation, the stepped undulations of the intermediate zone are progressively unfolded and the part in relief is simultaneously formed. The invention also provides a device for carrying out this.

Abstract: A system with a principal hopper having balances and discharge piping fitted with a valve and a flow sensor. The lower end of the piping extends into a secondary hopper which is connected to a pipe fitting powder to an ingot mold. The powder flows from the principal hopper into the secondary hopper and flows through the pipe into the ingot mould where it spreads over a cast metal surface. When the level of powder in the secondary hopper reaches the lower end of the piping, the flow is terminated and the flow sensor initiates valve closure. The valve is reopened after a specified time period or when another sensor indicates the absence of powder. In this way, it is possible to determine powder consumption by measuring the time between two successive valve openings or closures.

Abstract: Method for manufacturing a closing structure (3), openable in a controlled manner of a can, in particular a metallic can (1), the method comprising press forming the sheet blank so as to form a bulging zone, forming from the bulging zone a small curved zone, and producing in the region of the curved zone a cut-away part so as to form an aperture (5) including a peripheral skirt (10c), enlarging a part of the peripheral skirt (10c) and fixing by seaming to the aperture (5) a removable closure member (4) by forming a seamed edge portion (10e) constituted by the peripheral skirt (10c).

Abstract: According to a process for the manufacture of a framework (1) for reinforcing concrete structures and, in particular, concrete slab or shell structures in the form of a steel strip (3) with notched or goffered surfaces, a hot laminated sheet is used as a basis material having a width of between 1.5 and 6 mm, whereby said sheet is made of steel with a carbon content of less than 0.9%, and elastic limit of approximately 500 MPa. Said sheet is subjected to a cold lamination process at a strength-hardening level greater than 40% in order to obtain a sheet having, on the one hand, a thickness of between 0.8 and 2.5 mm, and on the other hand, an elastic limit greater than 700 MPa whereby the sheet is cut again so as to obtain a steel strip (3) which is then continuously notched or goffered. The application also concerns the framework obtained according to the process.

Abstract: The lid for a sealed container openable along a line of reduced strength merely by exerting a pull is of the type comprising a substantially right-angles fold (4) constituting a line of reduced strength which is formed by a stamping operation on a sheet of steel having a thickness less than or equal to 0.16 mm. The line of reduced thickness permits the complete or partial opening of the container. The lid is preferably composed of 0.10 to 0.16 mm thick steel and, at the fold (4), the inside radius of curvature of the lid is 10 to 50 .mu.m and the outside radius of curvature of the lid is 100 to 200 .mu.m. The invention is applicable to sealed metal containers, such as food beverage cans or trays for pre-cooked dishes.

Abstract: The subject of the present invention is a method for forming a sheet-metal blank (1), in particular in order to make a cathode ray tube mask, on a press, according to which the central part (1a) of the sheet-metal blank (1) is formed with a specified curvature under the effect of a punch (20) which deforms, in a mould (12), the upper die part (14), the load exerted on the punch (20) being distributed over the entire surface of the base (24) of the punch (20), and according to which, after the curving of the central part of the sheet-metal blank, a mechanical action is exerted on a peripheral forming member (30) so as to apply pressure to a ring (36), the ring (36) is deformed and presses against the free part (1b) of the sheet-metal blank (1) in order first to effect a controlled bending of the said free part, and then the said free part (1b) is applied, still under the action of the ring (36), along the side walls of the punch (20) in order to form the flanged edge.

Abstract: The present invention relates to a method for cleaning a liquid metal bath, in particular a zinc or zinc-aluminum bath intended for the continuous production of a steel strip coated by immersion in a coating zone (5a), according to which method the metal coating bath (2) is cycled continuously between the coating zone (5a) and a cleaning zone (5b), the rise of solid intermetallic compounds contained in the said bath to the surface is brought about in the cleaning zone (5b), the rise of the said compounds in accelerated and the cleaned bath (2), the iron content of which is close to or below the solubility limit, is led back to the zone (5a).The invention also relates to an apparatus for carrying out the method.

Abstract: The torch fitted with a nozzle (6) comprises a visual observation optical device having one end part coaxially inside the central gas feed pipe (7) and the other end extending outside the body (1) at the opposite end to the nozzle; the optical device being situated a specific distance from the main orifice (17) of the nozzle so that the bounds of its angle of view pass through the edges of said main orifice.

Abstract: The present invention relates to a method for forming a sheet-metal blank (1), in particular for making a cathode tube mask, on a press, according to which the peripheral part of the sheet-metal blank (1) is held over a small width in a peripheral member (30), the central part of the sheet-metal blank (1) is formed, according to a given curvature, by deforming the punch (17) and the die (13) through the action of an upper bearing plate (19), a mechanical force is exerted on localized zones of the clamping member (30), moving closer together the opposite elements of the said clamping member, and at the same time the peripheral zone of the sheet-metal blank (1) is applied and unfurled along the side walls of the punch (17) or of the die (13) by a relative movement of the clamping member (30) with respect to the punch (17) or to the die (13) so as to obtain the final flanged edge.The invention also relates to a cathode tube mask made in accordance with this method.

Abstract: The process for the preparation of an aldehyde of formula R--CHO in which R is an alkyl group of C.sub.1 -C.sub.7 comprises according to the invention the reaction on an alkyl formate of formula H--COOR in which R has the meaning given above, of a gas constituted mainly by CO, in the presence of(a) a catalyst based on a metal chosen from among Rh, Ru, Ir, mixtures of them or a mixture of Rh and/or Ru and/or Ir with Co, Ni or Fe,(b) a promoter chosen from among iodides and mixtures of covalent compounds of iodine and a phosphine or a tertiary amine,(c) a solvent consisting of a cyclic N-alkyl amide.

Abstract: A rotary conductor roll intended to be partially immersed in an electrolyte in a manufacturing line for continuously electroplating a strip (2), the roll includes, on its periphery, at least one electrically conductive active zone (3) and at least one coated zone (41) coated with a flexible material which may optionally be associated with an adhesive and which serves to seal the contact between the strip (2) and the conductive active zone (3) from the electrolyte. At least one intermediate ring (42) is interposed between said conductive active zone (3) and said coated zone (41), said intermediate ring being made of a polymer for which at least one of the following coefficients is intermediate in value between the corresponding coefficients of the material constituting the conductive active zone (3) and of the material constituting said coated zone (41), said coefficients being: coefficient of expansion, flexibility, and swelling due to contact with the electrolyte, e.g.

Abstract: The invention is concerned with an electrolyte injector for an electrogalvanizing line, wherein electrolyte is injected backwards into the space between the steel strip 14 and the anodes 15. The injector, disposed on the side where the rising strip leaves the electrolyte bath 12, has a nozzle 9 provided with a plurality of injection pipes 11 allowing the electrolyte from the bath 12 to pass freely between these pipes 11.

Abstract: A valve body comprises a first sealing seat and a second seat opposite the first. The valve element is selectively controlled so that, in addition to the position in which a bearing surface thereof rests on the first seat to ensure tightness of the device and of the circuit on which it is mounted, the valve element can be placed in a median position between the two seats, so as to provide a maximum flowing section between the valve element and the valve body for draining the circuit. In intermediate positions, another bearing surface of the valve element works in cooperation with the second seat, the valve element being held in a position selected between the first median position and a resting position on the second seat, thus limiting the flowing section between the valve element and the second seat to control the discharge of the circuit.

Abstract: An improved two phase basic steel refining process for phosphoric pig iron is described which comprises forming a steel having a phosphorus content of not greater than 0.

Abstract: In order to supply and control the deposit, on the surface of the metal bath of a continuous casting mold, of an evenly distributed layer, of predetermined thickness, of a powdery or granulated material, by way of a supply conduit whose end portion is provided with a delivery nozzle situated above the surface of said metal bath. The delivery nozzle is situated above the surface of the metal bath, at a height equal to or slightly more than the predetermined thickness, the said delivery nozzle is permanently open, and the end portion of the supply conduit is permanently supplied with the said material.

Abstract: The invention relates to furnaces equipped with an insulating inner lining formed from fibers. The object of the invention is to reduce the thermal discontinuities at the level of the orifice tube of the burner. For this purpose, the orifice tube consists of blankets of fibers arranged radially round the burner and compressed to a greater extent in the inner part facing the axis of the burner than in the outer part. The density in the inner part preferably reaches 300 to 400 kg/m.sup.3.

Abstract: A method and apparatus are disclosed for the sintering of an ore using gaseous fuel. A layer of noncombustible particulate mineral material is arranged on a supporting grate, and hot fumes derived from gaseous fuel are passed downwardly through the layer of material. The temperature of the hot fumes is sufficient to initiate fusion or sintering of the mineral material. Predrying, sintering and cooling means are provided along the length of the supporting grate in order to effect the desired sintering.