Abstract:
La présente invention concerne un procédé de réalisation d'un renfort métallique (30) de bord d'attaque ou de bord de fuite d'aube de turbomachine comportant successivement: - une étape de réalisation d'un insert métallique (41) représentant la base (39) du renfort métallique (30); - une étape de positionnement dudit insert métallique (41) sur l'extrémité (54) d'une préforme (51) d'un outillage de forme (50), ladite préforme (51 ) reprenant la forme de ladite aube (10) de turbomachine; - une étape de formage d'une tôle métallique plane (60) sur ledit insert métallique (41) et sur ladite préforme (51) dudit outillage (50) par un procédé de formage à chaud superplastique.
Abstract:
The invention relates to metal forming, more specifically, to methods for producing titanium alloy articles by superplastic shaping and diffusion welding. The inventive method is particularly suitable for aviation engine building for producing a fan blade-type part. The inventive method for producing an article by superplastic shaping and diffusion welding from at least two titanium alloy blanks consists in designating connectable and not-connectable sections on the surface of at least one blank, in assembling the blanks into a packet, in heating said packet to a specified temperature (T), in exposing it to a specified pressure (p) in such a way that the blanks are connected to each other by diffusion welding and a semi-finished product is obtained, in heating and supplying a pressurised working medium into the semi-finished product internal cavity for superplastically shaping at least one blank in such a way that a desirably shaped article is produced. Said method differs from known methods in that the diffusion welding is carried out through titanium alloy plates whose flow stress is less than the blank flow stress, mainly, when the article is made from at least three blanks and a connection preventing material is applied to the non-connectable sections of at least one part of at least one blank surface.
Abstract:
A superplastically formed structural assembly is provided, as is an associated preform and method for forming such an assembly. The assembly includes a skin member and a support member that are joined to define a space between the members and between the joints. The assembly can be produced by joining the members in a flat configuration, and then forming the resulting preform to a predetermined shape of the structural assembly. The support member defines at least one aperture in communication with the space between the members. Thus, the skin member can be formed by delivering a pressurized fluid through the support member to the skin member, e.g., to superplastically form the skin member against a die that defines a contour surface corresponding in shape to the predetermined configuration of the assembly. The support member can extend in a substantially direct configuration between opposing portions of the skin member.
Abstract:
A hydraulic pressure molding device (A) and a hydraulic pressure molding method for molding a molded body of a specified shape by holding a material plate (1) by a first mold (10) pressing the material plate (1) with a pressurized liquid medium (2) and a second mold (20) in which a molding recessed surface (21) of a specified shape is formed and pressing the material plate (1) with the liquid medium (2) to bring the material plate (1) into contact with the molding recessed surface (21). The second mold (20) comprises deformation resistance adjusting means (22) and (23) locally differentiating the deformation resistance of the material plate (1). The deformation resistance adjusting means (22) and (23) are formed of a local cooling means (22) locally cooling the material plate (1) and a local heating means (23) locally heating the material plate (1). In addition, the deformation resistance adjusting means (22) and (23) are formed movable forward and backward relative to the second mold (20).
Abstract:
A method of forming and a blank therefor, in which the blank (1) comprises a parent body (2) and at least one insert (3), at least one of which is made of a material which possesses superplastic properties. The insert (3) is joined to the parent body (2) by friction stir welding. The primary purpose of the invention is to provide a blank for a forming process during which some parts of the blank are required to deform to an extent which requires superplastic properties, whereas the remaining parts of the blank are deformed to a lesser extent.
Abstract:
The mould (10) includes at least one part (20), intended to be in contact with the component (12) being moulded, made from sintered vitreous silica. According to the process, said component (12) is formed by the superplastic forming in the mould (10) of a plate (18) made of a material capable of undergoing superplastic deformation, for example titanium or titanium alloy, aluminium or aluminium alloy, or any material exhibiting superplastic properties. Preferably, a barrier is formed between at least a part of the contact surfaces of the mould (10) and the component (12) being moulded, for example by coating with boron nitride, at least partially, the contact surfaces of the mould (10) and the component (12) being moulded, before placing the plate (18) in the mould (10), and/or by injecting an inert gas, notably helium or argon, between the contact surfaces of the mould (10) and the component (12) being moulded.
Abstract:
The invention relates to the treatment of metals by pressure and to welding thereof by pressure. It is directed towards a method of manufacturing a multilayer cellular structure from materials capable of superplastic deformations, consisting of: joining sheet blanks of a filler made from titan alloy by means of welds that follow predetermined patterns; air-tightening the hollow between such blanks; inserting these blanks between sheet blanks of a skin; effecting forming through regulated pressure of a working medium; and solid-phase joining. To improve the quality of solid-phase joining the manufacturing is effected in two steps within a temperature range T1-Tp.t. where T1 is a temperature not exceeding the temperature of aging of tempered titan alloys, preferably 550 DEG C, and Tp.t. is the temperature of full polymorph transformation of the titan alloy. On the first step, the forming is made in such a way as to obtain a half-finished product with ready cells, and a physical contact is achieved between the joined surfaces of the sheet blanks. On the second step, the half-finished product is deformed with a degree of deformation epsilon of the joined sheet blanks. The grain size in the sheet blanks of the filler and/or of the skin is selected to meet the equation epsilon > epsilon min, where epsilon min is a minimal degree of deformation required to ensure the grain-boundary creep in the joining zone.
Abstract:
Magnesium hydroxide or mixtures of magnesium hydroxide and boron nitride applied, e.g., by spraying in a liquid vehicle onto surfaces of a sheet (22) of a superplastic formable metal alloy facilitate the forming of such sheet material and the removal of the formed sheet material from the forming tool or die (10).
Abstract:
For forming or consolidating organic matrix composites, for example, an organic matrix composite panel (106) is sealed between sheets of a susceptor material (100, 102) that is susceptible to induction heating. The susceptor sheets (100, 102) are heated inductively. The sheets in turn conduct heat to the organic matrix composite panel (106). When heated to the desired temperature, the composite panel (106) is consolidated and/or formed. In the present invention, the susceptor sheets are selected so that their magnetic permeability decreases to unity at approximately the desired operating temperature thereby limiting heating to this "Curie temperature" and providing substantial uniformity of temperature in the panel. Of course, the concept applies to other induction heating operations for metals including SPF, brazing, annealing, heat treating, bonding, hot pressing, and the like.