Abstract: Grooved metal tubes, with a groove-bottom thickness Tf and outside diameter De, internally grooved with N helical ribs having an apex angle ?, height H, base width LN, and helix angle ?, two consecutive ribs being separated by a groove, generally flat-bottomed, having a width LR, with a pitch P equal to LR+LN, are characterized in that: a) the thickness Tf of the tube is such that Tf/De is equal to 0.023±0.005, Tf and De being expressed in mm, with De ranging between 4 and 14.5 mm; b) the ribs have a height H such that H/De is equal to 0.028±0.005, H and De being expressed in mm; c) the number N of ribs is such that N/De is equal to 2.1±0.4, and the corresponding pitch P is equal to p·Di/N, with Di equal to De?2·Tf, and De being expressed in mm; d) the base widths LN and LR are such that LN/LR is between 0.20 and 0.80; e) the apex angle ? ranges from 10° to 50°; and f) the helix angle ? ranges from 20° to 50°.

Abstract: Grooved metal tubes (1), of outer diameter De, the tubes being grooved internally with N helical ribs (2) of an apex angle ?, height H, base width LN and helical angle ?, two consecutive ribs being separated by a flat-bottomed groove (3) of width LR, with a pitch P equal to LR+LN. These tubes are characterised in that, a) De is between 4 and 20 mm, b) the number N of ribs ranges from 46 to 98, c) the rib height H ranges from 0.18 mm to 0.40 mm, d) the apex angle ? ranges from 15° to 30°, e) the helical angle ? ranges from 18° to 35°. These tubes make it possible to simultaneously obtain a high heat exchange coefficient in evaporation and condensation and a low pressure loss.

Abstract: A recycling process for zinc-rich solid waste containing zinc oxide, Cu oxides and impurities normally present in brass, in which a mixture is formed containing the waste with a finely divided solid reducing agent and a binder, and the mixture is compacted as agglomerates with open pores. The agglomerates are added into a treatment reactor containing a bath of liquid copper or brass metal, in which the zinc and copper oxides are reduced, to obtain in the treatment reactor after the reduction, a new brass in liquid form and a new waste. The new liquid brass is transferred into a fusion and casting furnace, in which its composition is optionally adjusted, and the new liquid brass is cast to form a product. Any waste present in the treatment reactor and the casting furnace are recycled using this process.

Abstract: A connector (1) for connecting two tubes (5, 6) by cooperation between a first element (3) fixed to a first tube (6) and a second tube (2) forming a sleeve for a second element (5) fitted at its end with a flared part (50, 51, 52, 53) by a claw (4) including a spring (44) compressing the said flared part. The said claw (4) forms a first cylindrical guide ring (40) sliding on the external cylindrical surface (32) of the first element (3) and has a recess (41) forming a cage for the spring (44). A second cylindrical guide ring (42) is fixed to the first ring (40) and sliding on the external surface (21) of the second element (2), and including a device (43) for locking/unlocking the second element (2) and the second cylindrical ring (42).

Abstract: Apparatus for feeding a machine with a wire selected from a plurality of wires includes wire guides for supplying wires to a receiver device, a wire distributor for selecting one of the wires and moving the selected wire through an output guide to a machine, such as an electroerosion cutting device. The distributor includes shears for cutting the selected wire.

Abstract: Tube (1) internally grooved by helicoidal ribs (2) having a helix angle of 5.degree. to 50.degree., an apex angle (alpha) of 30.degree. to 60.degree.. The tube is characterized in that the ribs (2) form a periodic profile comprising at least two ribs of different heights, one designated high (2h) of a height Hh, and the other designated low (2b) of a height Hb, with a ratio Hb/Hh of 0.40 to 0.97, each high rib being bordered by a flat-bottomed groove (3).

Abstract: A method comprising the steps of (a) preparing a divided copper oxide dispersion (4) including a solvent and a selected binder, (b) applying said dispersion to a non-conductive substrate (1) to form a film (5), (c) forming a Cu film (9) with a suitable reagent, and (d) electrolytically depositing at least one metal film (11) on said film (9).

Abstract: A drawing device including a drawing block and a traction device, where the traction device includes two drive belts and an automatic engagement device. This automatic engagement device includes an auxiliary traction device propelled with power by the traction device.

Abstract: A device for grooving the internal surface of tubes is disclosed as including a holding die for holding in position inside the tube a floating chuck equipped with a grooved chuck and a grooving unit including a rotating cage for retaining a number of rotating balls for compressing the tube wall against the grooved chuck to form a groove in the tube. The grooving unit includes a finishing die. The rotating cage includes a supporting member of which the internal profile, in an axial section is an arc of a circle, and a cage closure plate for retaining the balls in the cage and further includes a lubricator for the interior of the cage.

Abstract: A method is disclosed for manufacturing a finished product which consists at least partially of a copper nickel and tin based alloy which has undergone spinodal decomposition. A liquid bath of the Cu Ni Sn based alloy is prepared containing also titanium and possibly lead. A semi-finished product is formed by spray-deposition of this alloy onto a backing then transformed with an annealing stage followed by rapid tempering. The product obtained after transformation of the semi-finished product is subjected to a heat annealing treatment in order to carry out spinodal decomposition of the part of the said product which is constituted by Cu Ni Sn based alloy, to obtain a finished product. A semi-finished product or product is obtained by this method. Connectors and machinable products based on Cu Ni Sn and of high and homogeneous hardness are manufactured.

Abstract: A process for producing a Cu-Fe-Co-Ti alloy useful as conductor elements in the electronics and connector industries. The alloy is produced in the form of a bath having a Ti/Fe+Co ratio between 0.3 and 1 and a Co/Fe ratio between 0.10 and 0.90. The molten alloy bath is deoxidized with boron, cast, homogenized, cold drawn, and subjected to a precipitation heat treatment at a temperature lower, by at most 80.degree. C., than a temperature TM leading to the maximum electric conductivity.

Abstract: The invention concerns alloys comprising a matrix based on at least one conductor metal M, formed by a homogeneous dispersion in the matrix of stable coherent particles of one or more associations of ions of type M, M', O in which M represents the metal or metals of the matrix, M' represents a different metal from M, which is capable of undergoing internal oxidation, and O represents oxygen.It also concerns the process for the production of such alloys which comprises subjecting a starting alloy powder to the action of an oxidizing agent formed by a powder with a granulometry of the order of 1 .mu.m of a metal oxide capable by thermal decomposition of providing the oxygen necessary for the internal oxidization of M', the starting alloy being based on at least one metal M, if appropriate hardened by one or more elements R or A as defined hereinbefore.Use of such alloys for the electrical, electronic and connection arts.

Abstract: An improved continuous hydrostatic extrusion process and apparatus for metals is disclosed. In order to reduce the leaks of viscous fluid through the clearances between the rotor and the stator, which clearances are necessary for operation of the apparatus, the drive fluid used in the groove of the rotor to cause forward movement of the blank is of a higher viscosity than the fluid in the isostatic chamber in which extrusion pressure is present. The pumping power is acccordingly greatly reduced and it is possible to avoid the use of expensive and delicate pressure multiplying means.

Abstract: A process and article of manufacture relating to drawn rods made of lead brass which has been subjected to at least one intermediate annealing treatment, the invention involves annealing at a temperature of between 425.degree. C. and a temperature which is 10.degree. lower than the solidus point for a period of between 1/100 of a second and one minute. The rods thus obtained contain uncoalesced lead particles having a dimension of less than 1.5 micrometers and contain at least 8000 of these lead particles per square millimeter and for each percent of lead. The rods produce fine shavings during machining and do not cause blocking on breakage. The present lead brass rods are particularly useful for automatic screw thread cutting.

Abstract: The invention relates to an elastomeric end piece intended for high voltage electric cables.By incorporating into the elastomer one or more substances whose electrical impedance reduces as a function of the voltage applied, such as silicium carbide, zinc oxide doped with cobalt or bismuth, the titanates or zirconates of alkaline or alkaline-earth metals, the distortion of the radial electric field at the end of the cable which could cause disruptive breakdown is avoided.Application to the end of high voltage electric cables, especially in polluted urban areas.

Abstract: The invention concerns a process and apparatus for continuous hydrostatic extrusion wherein the pressure of the hydrostatic fluid is used to apply the blank to be extruded firmly against the walls or the bottom of a groove provided in a rotor, in such a way that the blank is entrained by the rotor without slipping to an extrusion chamber from which the blank is spontaneously extruded through a die. The invention finds use in particular for continuous extrusion of metal and alloys, including those which have a low degree of ductility.

Abstract: The invention relates to a process and an apparatus for the continuous heat treatment of metallic wires and bands. In the process according to the invention, the wire or band to be treated is passed around the base of the groove of a pulley and is annealed by induction heating. The treated wire or band is then cooled and re-enters the groove of the pulley above the wire or band to be treated. The invention is intended for the continuous treatment of metallic wires or bands.

Abstract: A method for extruding an object of undefined length capable of plastic deformation into another object of undefined length and smaller section, using the driving forces and the pressure developed in a viscous fluid surrounding the first object by the movement of a mobile member provided with a groove in its surface, the groove defining, together with the surface of a stationary member, a passage along which the first object is displaced towards a die by the action of the forces developed in the fluid by the mobile member.

Abstract: Apparatus and method of circulating a gas through coils of very long tubing during a heat treatment, wherein the coils of tubing are placed on hollow frames through which the clearing gas passes. The frames are fitted with nozzles to which at least one end of each coil can be connected. The invention can be applied to continuous annealing of coils of small-diameter copper tubing with a view to removing the last traces of drawing lubricant.

Abstract: In a method and apparatus for continuously measuring the annealing level on wires or strips, a wire or strip is passed, in a continuous feed, over a pulley of small diameter, at a tension less than that corresponding to the elastic limit of the material of which the wire or strip is made, so as to produce permanent elongation of 0.1 to 1%, this elongation being taken as a measurement of the annealing level, and utilized to control the annealing level.