Trefimetaux

Marc Moreau

Pierre Priester

Adam Szyszkowski

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.

Process for continuous hydrostatic extrusion of metals therefor

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.

Drawn rods made of lead brass and a process for the thermal treatment

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.

Continuous hydrostatic extrusion process and apparatus

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.

Process and apparatus for continuous heat treatment of metallic wires

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.

Method for continuous extrusion

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.

Method and apparatus for continuously measuring the annealing level on

Method for continuously measuring the annealing level on wires or strips

A method and apparatus 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.

Apparatus for continuous extrusion

A device for the continuous extrusion of an object of indefinite length into another object of indefinite length by means of movable elements which move inside a resistant body forming a continuous pressure cylinder inside which the object to be extruded is driven towards a die by means of a viscous fluid surrounding it.

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Asnieres, France

Marc Moreau