CH258061A - Method and apparatus for forging parts such as propeller hubs. - Google Patents

Description

<B>Method and apparatus for forging parts such as propeller hubs.</B>

The present invention, due to the collaboration of MM. Frangois Meley and Andre Lemoine, has as its object a process for the forging of parts such as propeller hubs.

This process is characterized in that a blank is subjected to compression except on at least part of its surface, and in that a compression is then exerted on the central zone @ .. of the uncompressed part of the draft in the direction of the center thereof.

The inv.ention visin also an apparei.l for the implementation of the prooede defined above.

This device is cara: cMrise by a matrix in two shells intended to receive febauehe and associated with desi rrloyens to tighten rer fehauche between the two shells, said matrix having at least one opening daas the axis of, the. which is provided with a punch of smaller section associated with means for pushing it into the blank through said opening.

The metal of the ebaazche is driven back by the first punch between that ei and the walls of the opening provided in the dies. The result is that the fibers of the metal follow the first contour of the walls. Housing practices by In punch: Dann the piece.

The accompanying drawing shows, by way of example, some embodiments of the apparatus according to the invention.

fig. 1 is -a view in 61evation, in section along I-I of 1a fig. 2, of an apparatus for forging the hubs of three-bladed propellers, before the forging action.

fig. 2 is a plan view of this apparatus.

fig. 3 is a plan view, with partial section along a horizontal plane, like the same alp, after forging.

Leah fig. 4 and 5 are elevation and plan views of the initial draft.

Leas fig. 6 and 7 are views in eIeva4#ion and in plan of the forged hub obtained.

fig. 8 is a view in elevation, in section according to VIII-VIII of 1a fig. 10; of a variant of apparatus, before 1'action de forge@age.

There; fig. 9 is a detail view of this device, -after forgegge faction.

The, fig. 10 is a plan view of this apparatus.

The apparatus shown in Figs. 1 to 3 comprises a lower support 1 resting on the first. lower beam 12 of the press; on this suppart are fixed by means of tie rods 10, troi, s groups of eylindres each comprising a piston. punching 4 and two return pistons 5 connected by a crosspiece 11..

On the upper bed 13 of the press is fixed the upper die carrier 3. The device also comprises two half-dies, a lower 6 fixed to the lower Porto-matrioe 2, a upper 7

fixed dann l9 upper die holder 3 and punches B. A distributor assembly 9 is used for the different maneuvers of the punching pistons, e 4.

The pressurized water supply is ensured by any source, a pump and an accumulator, with optional use of a pressure multiplier for the cylinders of the punch pistons swimming 4 requiring a large effort of work.

This device operates in the following way. The upper bed of the press carrying the die carrier 3 and the die 7 being in its raised position, the blank of the mayeu (fix. 4 and 5) is introduced into the lower die 6 .

A First movement consists in moving the upper beam of the press in the s:eus of the descent until the blank of the hub is trapped and pressed with all the power of the press in the imprint upper 7 and lower 6 matrices.

In this position represent & fix. 1, the mauere of 1'ebaiuche is .depa-ace .dans, par ties provided, dann areas annulasre3 exiis both between punches 8: and matrices 6 and 7.

A second movement consists in actuating the punches 8 by introducing water under pressure into the cylinders of the pistons 4 until the punches 8 have finished their stroke giving the hub the desired shape. This shape is represented in fix. 6 and 7, the fibers initially matched the outer contours of the blank (fix. 4 and 5) are well arranged after tra.nsformatian, following the outer contour e, <I>d, e, f, g</I > Hollow Parts formed in this way.

The device represents swr the fixes. 1 to 3 corresponds to the simultaneous tention of three housings @ of blades - of propellers Spur the same hub. It can be age according to the number of Aales coming to assemble on the hub; it suffices to fix: on the first lower support 1 the first corresponding number of groups of cylinders each receiving a piston of

punching 4, two pi.stans. reminder 5 a: with their crosspiece 11 and a paingon B.

In the. varianth of device represented on them, fixed. 8 to 10, said device comp.rend a pl @ aque support 14 connected to the mattress suip, erior of the press and on which are fixed four cylinders Pressers 'i5, two cylinders. 16 relievers and a 17 punch holder.

It also comprises a plate 18 secured to the pistons of the pressure cylinders 15 and lifters 16, this plate being intended for the fitKation of the upper die holder 19. A lower die holder 20 is. connected to the lower beam of the press.

Finally, the apparatus comprises two half matrioes 22 and 23 which constitute the specific ouhllage to each type of propeller body, a dilstribubenzr assembly 24 being provided for the different maneuvers of the pistons.

The operation of this apparatus is analogous to that of the apparatus described above.

The upper crown 25 of the press is in its raised position (fix. 8) the hub blank is introduced into the lower die 23. A first movement consists in actuating the press base in the downward direction. until the upper die 22 imprisons and presses the blank of the. hub dann the lower matrix 23 with all the power of the cylinders 15. in communication with the source of water under (Pressure.

Let this represented position be fixed. 8, the rough draft can only move within the intended part. that is to say, the annular zone existing between the punch 26 and the matrix 22.

It suffices to continue the movement of the press beam in the direction of 1a; descent until the punch 26 completes the transformation stroke so that the hub has the planned shape (fixed representation 9). The fibers which initially married the contour of Pebauch.e are at the end of the operation arranged along the first contour ex Urieur <I>j, k,</I> <B>1</B> of 1a Part er eure .du moyeir.

The process according to the invention can be implemented by means of various forging tools: hydraulic or mechanical pressfies, power hammers, mouto#nq, etc.

Claims (2)

CLAIMS I. Process for the forging of pikes such as propeller hubs, characterized in that one, the elyauche is; subject to compression except on at least part of s: a. on the face, and in that we then exert pressure on the central zone. of the uncompressed part. of the surface of the Auche, in the direction of the center of this one. II. Apparatus for implementing the <B>c64</B> product according to claim I, characterized by a two-shell die for receiving the blank and associated with means to clamp the blank between the two shells, said die presenting at least one opening in the face of which there is a punch of smaller cross-section; the saw has means for pushing it into the blank through said opening. III. Pike tolle quo propeller hub obtained by the 1st process according to claim I. S0US-CLAIMS 1. Apparatus according to claim II, in which the first punch is dann control los d, two directions by. pnstons: hydraulic. 2. Apparatus according to claim II, in which the two shells of the die have several openings, respectively following the axis of the blank and following the directions perpendicular to this axis.