A system for forming tubular metal products from tubular workpieces by hydroforming achieving single-step radial expansion of 70-150% with high dimensional accuracy. Enhanced single-step radial expansion is achieved by maintaining a predetermined functional relationship among the driving parameters of the hydroforming process and by increasing the plasticity of the workpiece by employing the fractional deformation effect and by applying ultrasound oscillations and alternating angular strains to the workpiece.

System and method for manufacturing tubular products from tubular workpieces

An apparatus for hydraulically shaping a hollow body has a stationary base, a die fixed on the base and formed with a cavity having an inner surface and axially oppositely open ends so that a tubular workpiece can be held in the cavity with ends of the workpiece exposed at the ends of the cavity, and a pair of pistons fittable with the workpiece ends. Respective actuators can displace the pistons toward each other and against the ends of the workpiece in the cavity. A hydraulic liquid is fed at high pressure through one of the pistons to an interior of the workpiece in the cavity to deform the workpiece. Respective first guides support the pistons on the base for vertical movement thereon, respective second guides support the pistons on the base for horizontal movement thereon, and respective third guides support the pistons on the base for pivotal movement about respective centers.

Apparatus for hydraulically shaping a hollow body

The deformation device (10) has a divided molding tool which has a first tool carrier (38) with first mold segment (44) and a second one (56) with a second segment (62). The first tool carrier can be moved to a working position seated on the second one, with the two segments facing each other. They are held in place by a holding device (64).

Internal high pressure deformation device, first mold segment of which on first tool carrier can be displaced

L'invention porte sur un dispositif de tube distributeur (10) de pressions fluidiques (P1, P2) monte a l'interieur d'un arbre de transmission (20). Des joints d'etancheite (30) sont prevus entre la paroi externe (11) du tube distributeur (10) et l'alesage (21) de l'arbre de transmission (20) a l'interieur duquel est monte le tube distributeur (10). Le tube distributeur (10) est pourvu sur sa paroi externe (11) de gorges destinees a recevoir chacune un joint d'etancheite (30). Les gorges sont realisees « monobloc » avec le tube distributeur (10) et par deformation des parties de la paroi du tube distributeur (10) comprenant les gorges.

Dispositif de tube distributeur de pressions fluidiques monte a l'interieur d'un arbre de transmission.

An apparatus for producing hollow bodies through deformation of a pipe by the internal high-pressure method has several Umformstosel (3), of which each is provided at the free axially movable end of an associated hydraulic cylinder piston arrangement (4). At least one of these Umformstosel (3) is provided with a pressure medium feed. The Umformstosel (3) are in accordance with the double arrows (AD) relative to each other adjustable with respect to axis of action and point in space in order to have to change as little as possible parts of the tool assembly for the manufacture of various hollow bodies.

Method of making hollow products

The subject of the invention is a method for hydroforming metallic pieces in a matrix, in which the leaktight closure of the ends of the piece and the pressurising of the liquid located therein are exerted simultaneously by the action of pushers (thrust devices) on the ends of the piece. The hydroforming machine according to the invention comprises, in a vessel 1, two thrust jacks (rams) 2, 3, the rods of which carry the pushers 16, 17, intended to enter into contact with the ends of a tube 21 contained in a die (matrix) consisting of two half-dies 4, 5. These two half-dies are held in place by the action of clamps (blocks) 9, 10.

Thiberge Louis

Papers

Hydroforming method and device for implementing it