Abstract: A method of mounting an annular element on a tube which involves surrounding said tube by a tubular sleeve of aluminum or an alloy thereof, which is sufficiently thin to be plastically deformable and has a similar cross-section, with suitable clearance, with one of the sleeve ends having an outside bevel; surrounding said tube, on the side of the sleeve bevel, with an annular element to be fastened, wherein the annular element has at least one opening whose crosswise dimensions are greater than those of the tube, but whose radial clearance with said tube is less than the thickness of the sleeve, and which has, on the sleeve side, an inside bevel whose maximum crosswise dimensions are greater than the crosswise dimensions of the end of the element and the sleeve toward one another, by a suitable means, and introducing the sleeve, by force, between the annular element and the tube by plastically deforming the sleeve and tube, thereby mounting the annular element.

Abstract: The invention concerns a method for minimizing deformation during rapid cooling of flat metallurigcal products such as sheets, strips, flattened portions, wide sections and the like.The method comprises rapidly cooling the product by means of a fluid (or mixtures of fluids) at temperature T.sub.F, comprising at least one vaporizable liquid, with modulation in a direction perpendicular to the direction of advance of the product, so as to impart different cooling speeds to the edges and the axis (case I) or to one edge and the other (case II).The technique may be completed by careful masking of the cooling in the zone for the rapid cooling action, or by controlled precooling prior to said rapid cooling.The method makes it possible to obtain the rapid cooling which is necessary e.g. in quenching operations, while at the same time minimizing the deformations or the internal stress level of flat products.

Abstract: Metal sheets of aluminum are provided with raised reinforcing portions of substantial height by rolling. The rolls have recesses or channels (6) whose side faces are in a counter-taper configuration with respect to a plane perpendicular to the axis of the cylinder, with an angle of inclination (.alpha.) of up to 5.degree.. The resulting product may advantageously be used for producing perforated metal sheets with high modulus of inertia.

Abstract: Device for assembly of profiles by a groove, tongue fitting, with locking by key, which avoids the risks of tongue and key sliding along groove. The device consists of making one of the male elements, tongue or key, longer than the other, in the direction of the generatrices of groove, and making one of the side surfaces of the longer element concave along the generatrices of groove. The invention allows realization of trellis constructions having oblique bars.

Abstract: The present invention relates to a process and apparatus for the recovery of liquid aluminium by compression of hot dross.The process comprises placing the dross in a die up to a height which depends on the diameter of said die and which is lower at the center than at the periphery of the die, and then applying to the dross a punch which is moved downwardly at a speed which is lower in proportion to a lower level of concentration of liquid aluminium in the dross.The apparatus comprises a cylindrical die (10) provided with an insert member at each of its ends. The die rests on a base (3) which has an annular groove (4) on its upper face; the lower insert member (7) is of a diameter that is at least equal to the inside diameter of the groove and in any case less than the outside diameter and has a continuous upper face of conical shape; the space (16) between the wall surface of said insert member and the internal wall surface of the die is of a constant width and is disposed facing the groove.

Abstract: This invention relates to inserts for pistons of diesel engines of aluminum-silicon alloys obtained by powder metallurgy.These inserts are characterized in that they contain elements such as iron and zirconium.They find their application in the manufacture of pistons intended to work at high temperatures for long periods and exhibit a good friction capacity.

Abstract: This invention relates to a process for sintering aluminum alloy powders under pressure.It consists in placing the powder in a capsule, in coating the capsule with an easily melted, stable vitreous material with a viscosity between 10.sup.2 and 10.sup.5 poises at the sintering temperature and in pressing it in a unidirectional press.It applies, in powder metallurgy, to the obtaining of castings that exhibit homogeneous mechanical properties, these castings being able to be roughcasts or finished castings.

Abstract: The invention concerns a process for improving the characteristics in respect of fatigue strength and toughness of worked Al alloys in the treated state, by means of a thermo-mechanical treatment which is carried out on the cast and possibly homogenized product.It comprises the following steps:(a) casting an initial product along an axis XX' by a known method(b) optional homogenization(c) upsetting in the hot state, preferably by means of a press, along the axis XX', with an upsetting ratio (initial length/final length along axis XX')>1.4(d) drawing in the hot state in the direction of the axis XX', with a rate of working (initial cross section/final cross section, considered perpendicularly to the axis XX')>1.

Abstract: The present invention relates to a method of controlling and regulating operational parameters of a machine for continuously casting bands between cylinders, allowing adhesion to be avoided. This method comprises considering as parameters the torque exerted on one or other of the cylinders for moving the band on and comprises permanently comparing the frequency of the variations in the torque measurement with a reference frequency. When the variation frequency is greater than the reference frequency, the casting speed of the machine is reduced and/or the lubricant flow rate is increased until the variation frequency is again lower than the reference frequency. The speed of the casting machine is then increased as long as the variation frequency remains below the reference frequency.

Abstract: A coupling for two tubes forcibly engaged one into the other, the two tubes being substantially of the same sections while the female tube is engaged into a sleeve or an opening whose diameter is little larger than the outside diameter of said tube. Thus, the female tube is crimped or banded in the sleeve or opening while the male tube is forced to contract. This assembly means may be used for making balustrades or ladders or assembling various members which are fixed with respect to the tubes or the ring.

Abstract: The invention concerns a cylindro-parabolic reflector for focusing solar rays on the focal axis of the cylinder.The reflector comprises modular elements which are assembled by means of tubes which are interengaged strictly in alignment with each other. The complementary male and female ends of the tubes have been formed by the tubes previously having been forcibly engaged into each other. This makes it possible to provide reflectors of substantially perfect parabolic shape, in spite of their substantial length.The invention will be used primarily in the construction of solar steam generating stations.

Abstract: A process for the thermal treatment of wrought products made of an aluminum alloy of the 2000 series comprising by weight from 3.5 to 5% copper, from 0.2 to 1% magnesium, from 0.25 to 1.2% silicon, with a Si to Mg ratio greater than 0.8 comprising solution heat treatment, quenching treatment, ageing and tempering wherein the tempering treatment comprises at least two stages: (1) a main tempering treatment at a temperature higher than 225.degree. C. and lower than 280.degree. C. lasting between 6 seconds and 60 minutes and (2) a complementary tempering treatment at a temperature between 120.degree. and 175.degree. C. lasting between 4 and 192 hours. This process allows the compromise between the mechanical tensile characteristics and the resistance to intercrystalline and stress corrosion to be improved.

Abstract: The invention relates to a method for quickly joining pipes by chamfering the end of a thin pipe, forcefully socket jointing this pipe in a pipe of the same diameter, dismantling the two pipes by traction. The two pipes can thereafter be rejoined easily and quickly by socket-jointing.

Abstract: A method for the production of a composite hollow body formed of aluminum alloys and composed of two layers having differing structure. One layer of the hollow body is intended to operate in contact with a mobile surface and is produced by extruding a mixture of particles of a hypereutectic silicon alloy having fine grains and an addition product. The other layer is selected from among alloys having certain particular properties and has the structure of a cast and wrought product. The present method particularly consists of the step of joining the two layers by coextrusion on a mandrel in an inverse extrusion press. The composite hollow bodies so produced are used in the production of linings for internal combustion engines or for jacks.

Abstract: An aluminum alloy for use in the production of enameled articles or articles subjected to elevated temperature having the following composition (% by weight):______________________________________ Mn 0.9 to 1.5 Si 1.0 to 1.5 Cr 0.05 to 0.2 Mg < 0.2 Cu < 0.2 Fe .gtoreq. 0.4 Ni .gtoreq. 0.05 Fe + Ni + Co 0.8 to 2 ______________________________________remainder aluminum and normal impurities.

Abstract: The invention relates to a process for the thermal treatment of aluminum alloys containing zinc, magnesium and copper as main alloying elements, and the products manufactured by this process and having an average particle diameter of Al-Mg-Cr phase of between 800 A and 1000 A. This process involves carrying out a treatment at high temperature for a sufficiently short period to prevent coalescense into particles which are too large. This treatment is preferably carried out at the homogenization stage for thin products and at the final dissolution stage for thick products. The invention is applied, in particular, to the manufacture of thin or thick sheets for the aeronautical industry.

Abstract: A process for the thermal treatment of thin products made of 7000 series aluminum alloys comprising a solution heat treatment, quenching treatment and a tempering treatment in three stages:pretempering between 100.degree. and 150.degree. C. for 5 minutes to 24 hours;intermediate tempering; and,final tempering between 100.degree. and 160.degree. C. for 2 to 48 hours.Intermediate tempering comprises a rapid rise in temperature to 190.degree. C. followed by a treatment at a temperature .theta.(t) between 190.degree. and 250.degree. C. for a total duration T in such a way that the function: ##EQU1## is comprised between 0.5 and 1.5; and T and t being expressed in seconds and .theta.(t) in .degree.K.This tempering treatment imparts to the products treated both high mechanical characteristics and a high resistance to stress corrosion.

Abstract: A compressor for a refrigerant gas wherein a rotor acts on a rocking plate to effect rocking thereof and reciprocation of pistons in cylinder bores to produce suction and exhaust strokes for refrigerant gas. A lubricant is contained in a sump in the compressor casing and it is atomized and mixed with refrigerant gas which leaks past the pistons. A duct is formed in the casing for conveying the mixture of refrigerant gas and lubricant from the casing under the action of the suction stroke of the pistons. The mixture is delivered at the inlet for refrigerant gas and the total mixture now flows to a separator where the lubricant is separated from the refrigerant gas. The refrigerant gas is then supplied into the cylinder bores during the suction stroke and the lubricant is delivered into a reservoir where it is forceably delivered back into the casing to the sump.

Abstract: Drawn and hemmed metal parts, such as vehicle body panels, are made from an aluminum based alloy containing 1.5-2.5% copper, 0.5-1.0% magnesium and 0.4-0.8% silicon and in addition may contain up to 0.2% chromium, 0.4% manganese, 0.2% titanium, 0.2% zirconium and 0.5% iron.

Abstract: The method of and apparatus for the production of bars or machine wire from alloys of aluminum or copper by continuous casting of the rough shape in a grooved casting wheel closed by a band or chain and the subsequent steps of rolling and scalping the rough shape in a series of successive operations.