FR2507509A1 - PROCESS AND DEVICE FOR FORGING THIN PARTS WITH LARGE SURFACE AND PRESS MODELS FOR EXECUTING THE PROCESS - Google Patents

Abstract

PROCESS FOR FORGING THIN PARTS WITH LARGE SURFACES, CHARACTERIZED IN THAT AN INTERVAL 8 IS PROVIDED FOR REDUCING THE TRANSMISSION OF HEAT BETWEEN PART 1 AND THE DIE 2.

Description

The invention relates to a method for forging large thin parts

  surface, for example for forging

  finishing, on screw presses, rough turbine blades

  We have come more and more, for some time, to apply the process of stamping to manufacture parts

  thin with a large surface, such as, for example,

  bine For this purpose, we use large screw presses

  sance of pressing, on which parts roughed in the forge undergo a final forging in one or more strikes To do this, it is necessary that the parts are strongly reheated Since there is at the same time need of turbine blades more and more, one encounters difficulties with regard to finishing forging. Thus it is not possible to increase at will the size of the gold screw presses since, according to the invention, in the case of processes of this kind hitherto known, it lost a lot of heat after the introduction of the pieces in the etching of the die, the present invention aims to

  solve the remaining problem, making sure that

  as little heat as possible is lost before the operation

forging proper.

  For this purpose, it is proposed according to the invention that in the phase in which no deformation of the part occurs, intervals are provided for reducing the heat transmission between the part and the matrix of a part and / or between the upper part of the stamp holder and the slide, as well as between the lower part of the stamp holder and the press table on the other hand Under these conditions, it is also possible, according to the process of invention, only after

  its placement in the matrix and until the operation of-

  actual forming, the workpiece is lifted out of the

  matrix, at least for the most part, and that it does not pre-

  feels no contact with the stamping engraving For this purpose,

  the part which must be shaped according to the process of the invention

  tion is provided, in its bordering regions, with lugs which protrude from the normal profile of the part According

  the invention, these support lugs can be formed by

  geage during roughing by an appropriate form of engraving

re.

  A device for carrying out the process of the invention

  tion is characterized by the fact that there are provided, in the matrix, lifting devices on which the workpiece is supported. This lifting device can then be constituted by dowels which are mounted in the matrix and which

cooperate with springs.

  Furthermore, for the execution of the method, it is proposed that as regards the design of the press, the lower part of the stamp holder can be lifted at

  distance from the press table by means of lifting devices

  Another press model is characterized in that the upper part of the stamp holder is fixed to the slide by means of screws, so that in the idle state, -a

  an interval is left between these two elements.

  This particular embodiment of the press proves to be advantageous, in particular in the case where the forging is carried out with a preheated matrix, such as for example for the manufacture of turbine blades. This known preheating

  matrices could only be performed within specific limits

  mined, because too intense a transmission of heat to the machines

  nes would have given rise to expansions of parts thereof,

  which would have been prejudicial Because it is now

  but provided for intervals between the stamp holders and the parts of the machines, it is possible to preheat the materials to higher temperatures, without this causing damage to the press proper Furthermore, the drop in heat between the part itself and the matrix is

further reduced.

  According to the process of the invention, the transmission of heat, on the one hand from the part to the matrix and, on the other hand,

  parts of the stamp holder at the press table and at the slide

  bucket, is considerably reduced As a result, heat is retained longer than before in the room, which means that deformation is possible with less force.

  The invention is explained below in more detail.

  lée, with reference to the accompanying drawings which illustrate an example

  of arbitrarily chosen realization.

  Figure 1 is a sectional view of a die with a part. Figure 2 is a similar view, with devices

room elevators.

  Figure 3 is a sectional view of the tool area

of a press.

  From what is shown in FIG. 1, there are provided, in the end regions 1a and 1b of the part 1, lugs 12 and 13 which can for example be formed by forging during the lashing This results, during the installation of the part 1, an interval 8 entered the part 1 and the

matrix 2.

  In the embodiment shown in Figure 2, the part 1 is raised by means of lifting devices

  14 and 15 placed in matrix 2, which gives rise to an inter-

  valle 9 even bigger The lifting devices 14 and 15 can be made for example - by simple dowels

  17 which cooperate with springs 16.

  It can be seen, in the sectional view of FIG. 3, that the upper part 4 of the stamp holder is fixed to the slide by means of screws 20 and 21 so that in the idle state, there is provided a interval 10 between slide 5

  and the upper part 4 of the stamp holder.

  In this case, the lower part 6 of the stamp holder

  can be moved away from the press table 7 by means of

  lifting lugs 18 and 19, so that there is also a gap 11 between the press table 7 and the lower part 6 of the stamp holder It goes without saying that here again, the part 1 can also be lifted by means of lifting devices, in the manner of the embodiment shown in FIG. 1, which has not been indicated to simplify the drawing The upper stamp is designated by 3.

Claims (8)

  1 Method for forging thin parts with a large surface area, for example for finishing forging, on screw presses, roughed turbine blades, characterized in that   that in the phase in which no deformation occurs   mation of the part (1), there are provided gaps (8, 9,, 11) intended to reduce the heat transmission between the part (1) and the matrix (2) on the one hand and / or between the part upper (4) of the stamp holder and the slide (5), as well as between the lower part (6) of the stamp holder and the press table (7) on the other hand.   2 Method according to claim 1, characterized in that after its installation in the matrix (2) and up to the actual forming operation, the part (1) is lifted out of the matrix (2), at least in his major   part, and has no contact with the engraving-stamping.   3 Piece intended to be shaped by the method according to claim 1 or 2, characterized in that this piece (1) is provided, in its bordering regions (la, lb), with lugs (12, 13) which protrude from the normal profile of the room.   4 A method for manufacturing a part according to claim 3, characterized in that the support pins (12, 13) are formed by forging during roughing, by a shape appropriate engraving.   5 Device for carrying out the method according to claim 1 or 2, characterized in that it is arranged, in   the matrix (2), lifting devices (14, 15) on the which the part (1) is supported.   6 Device according to claim 5, characterized in that the lifting devices (14, 15) consist of pins (17) which are mounted in the matrix (2) and which cooperate with springs (16).   7 Press model for carrying out the process according to   claim 1 or 2, characterized in that the lower part   lower (6) of the stamp holder can be moved away from the table   press (7) by means of lifting devices (18, 19).   8 Press model for carrying out the process according to   claim 1 or 2, characterized in that the upper part   lower (4) of the stamp holder is screwed to the slide (5) by means of screws (20, 21) so that in the rest state,   an interval (10) is provided between these two elements (4, 5).