DE927868C - Process for deforming sheet metal using a rigid die and a flexible pressed body - Google Patents

Description

Process for deforming sheet metal using a rigid die and a resilient pressed body. Tools are often used to deform sheet metal used, which consists of a die made of rigid material and a punch made of flexible Material, e.g. B. rubber, exist, the stamp regardless of the shape of the Workpiece has a flat surface or only approximately corresponding to the workpiece is shaped. The pressure acts perpendicular to the plane of the undeformed sheet. However, this method is only useful for simpler workpieces, as it is very it is difficult to correctly distribute the strains occurring over the sheet metal surface; The process fails in particular with greater drawing depths with smaller radii.

The inventive method now works in such a way that the possibly pre-bent sheet metal is inserted into the device so that the press pressure is at least runs approximately parallel to the sheet metal. When the rubber deforms, it stretches this is known to be transverse to the printing direction, and this lateral expansion is used to press the sheet metal against the die. It gives you greater freedom in the distribution of the strain over the sheet metal and can thus produce workpieces, otherwise only in several work steps with intermediate heat treatment can be produced. It is true that it is often also in the case of the method according to the invention expedient to undertake the deformation in several operations, but it can generally the same apparatus can be used and the operations can immediately follow one another. The drawings show two exemplary embodiments of the process, namely Fig. i to 4 the production of an edging ring; Fig. 5 to 8 the production of a cladding sheet for the wing fuselage connection on a Plane.

In Fig. I, i is roughly cut off from a thin-walled tube or a ring welded together from a sheet metal strip. 2 is the die and 3 the pressed body made of deformable material. Fig.2 shows the device after completing the first step. The device is between the press table 4 and ram 5 of a press of any type used. By the pressure the pressed body 3 has compressed and spread sideways and thereby the sheet metal ring i is formed into an angular ring 6. Fig.3 shows the device the second and final step. Over the neck of the sheet metal ring 6 are the two pushed through the edging ring to be connected sheets 7, and the pressed body 3 is brought back to its place. Fig.4 shows how the deformed by the pressing pressure Press body 3 has formed the angular ring 6 into a bezel ring 8, which the two Sheets 7 firmly connects.

Such edging rings have so far been made from a flat sheet of metal cut rings, the inner part of this ring initially under formation pulled through a neck and then wrapped around the metal sheets to be connected to the outside became. The originally inner fiber of the ring has all of the occurring To absorb stretch, while the originally outer fiber remains uninvolved. The success was mostly a tearing of the overstretched sheet metal edge.

Fig. 5 shows a cladding sheet io with that shown in Fig. 6 Die i i is produced.

Fig.7 shows a cross section through the device immediately before the first step. The sheet metal io, pre-bent accordingly, is at an angle in the Die i i placed so that its two longitudinal edges almost evenly on the Participate in deformation. To make the work easier, only the upper one should be used at first Half of the sheet is deformed; the cavity of the mold is therefore filled with inserts 12 filled out of solid material (such as wood); above it comes the flexible pressed body, which here consists of individual rubber sheets 13 placed one above the other.

Fig. 8 shows the beginning of the deformation. Under the pressure of the ram 14 spreads the pressed body 13 laterally and presses the initially free-standing Part of the sheet metal to the die.

Fig. 9 shows the same device prepared for the second operation. The upper part, the work piece io, already has the finished form; now the lower one has to Part, corresponding to the die i i, are deformed. For this purpose, the rigid inserts 12 taken from the die, where appropriate the lowest Can stay in place. The die is otherwise provided with rubber plates 14 filled in and covered. When the ram goes down, the compact now fills 13 the cavity of the die i i completely and gives the workpiece io its final shape shown in Fig. 5.

Flanging and folding work can also be carried out quickly in a similar manner and carry out cleanly.

Claims (3)

PATENT CLAIMS: i. A method for deforming sheet metal jackets by means of a rigid die and a resilient pressed body by pressure acting on this from the outside, characterized in that the perpendicular or approximately perpendicular sheet metal jacket is bent outwards by an extension of the pressed body directed perpendicular to it, via an abutment . 2. Procedure according to claim i, characterized in that the deformation in two or more successive operations in a die is carried out in such a way that In the first step, the part of the protruding over the die at an angle into it used and supported within the die by inserts made of solid material Sheet metal is bent and in the second step the one in the die Part of the sheet after replacing the inserts with rubber plates to the corresponding shaped wall of the die is pressed. 3. The method according to claim i, characterized in that at the same time as the deformation of the sheet, the production of a connection is made between two or more workpieces. References: French Patent Nos. 659408, 764 488; Austrian patent specification No. 119 007_; British Patent No. 233 144.