DE2117402A1 - Method and device for folding thin sheets by means of half-waves - Google Patents

Description

DR. MÖLLER-BOR6 DIPL-PHYS. DR. MANITZ DIPL-CHEM. DR. DEUF * ^ DIPL-ING. FINSTERWALD DIPL-ING. GRÄMKOW Z I 17402 PATENT LAWYERS

Hl / si - S 2249 Wi

Societe Nationale Industrielle Aero sp at i al e

37 “Boulevard de Montmorency Paris 16, France

Method and device for folding of thin sheets by means of half waves

The invention relates to the folding of thin sheets by means of half-waves and is particularly concerned with the folding of thin sheets of materials that are susceptible to being pulled or stuck in terms of permanent deformation are.

It is a method of folding thin metal sheets on hangings or soaps known, in which the folding by means of two rollers or combs or threaded jaws by forming a Series of screw shafts arranged next to one another at regular intervals

109844/1167

Dr. M · * «·· ** Dr. Monitz - Dr. D «uW · Dipl-Ii *. FiintwwaM Dipl.-Ine. Orflmkow

trawndmma. Am Mrgwparfc »β MOndwn 22, Robwt-KoaVStrae · I 7 Stuttgart - lad Camilla»

T «Ufoii | 053I> 7 * W _{Uhfon m])} ^ _{3645 Uln} j ^^ _{n | bpet} Markhlrae · 3rd TtMon (0711) 3 * 72 * 1 Bm * _: Znttralfcontf toy «. Volksbonk.n, MOndiwi, Ktq.-No. 9t22 Pwttdwd .: MOndim 15415

Bubble on which the fold of the head wave is pressed, by the previous groove, the forming roller, a tensioning roller in front of each bubble and the effect of one on the curved solid sheet opposite the shaft with respect to the preceding groove limited.

The groove of the head shaft, which is thus formed in the first track of the comb or of the threaded jaw, reverses after one complete revolution of the ISLfens to the second Trace of the threaded jaw back, thus creating a helical trace by continuously turning the screw in the threaded jaws.

There are so folded rings or help or conical Get structures. After processing the folded tires For example, folded elements for filling sandwich panels are obtained, in which the helical The passage in the threaded jaws allows a high precision of a few minutes of arc for the angles and in of the order of hundredths of a millimeter in the slope used in the manufacture of panels for the automatic welding operations on the reinforcement and afterwards when using it as a prefabricated interchangeable Elements is required.

While this manufacturing process is satisfactory for example for a stainless steel strip of fifteen hundredths, it has been found that when thin or medium-sized sheets are to be folded in this way, the metal experiences excessive stresses and defects occur. Likewise, on a band of fifteen hundredths in very ductile metals, such as titanium, the remains

10 9 8 4 4/1167

are sensitive to permanent deformation, the Tire or Hing is not strictly cylindrical and its overall cross-section takes an undesirable conical shape in the plastic area.

Therefore, according to the present invention, there is a method of molding provided by means of half-waves at two work stations, whereby a first work station first folds a half-wave, whereby the metal required for the formation of a half-step is claimed, and a second job the other half-wave folds in the opposite direction to complete the head recess or first groove, the following in the screw pitch of the comb or thread comb or thread jaw of the first job intervenes in order to complete the folding geometry with the desired high precision.

The invention is illustrated below with reference to the drawing, for example described; in this shows:

1 is a perspective view of a device for folding a tire made of thin sheet metal according to FIG the invention,

Fig. 2 is a schematic representation of the formation of the folded sheets wave by wave in a known manner,

3 shows a schematic representation of the formation of folded metal sheets by means of half-waves at two work stations according to the invention and

Fig. 4- is a view of a sheet in the course of folding.

109844/1167

According to lig. 1 is a ring or tire 1 from a to folding smooth thin film or a smooth thin sheet metal band or steel band to be folded between two Roller sets 2, 3 and 4-, 5 arranged. The rollers 2 and 3 of the first job carry roller combs or roller jaws 6 and 7 (the comb 7 is not shown). the Rollers 4 and 5 have combs or jaws 8 and 9 (the comb 9 is not visible).

Between the rollers 2 and 4 and the tire 1 a ' rigid cylindrical support or such a carrier 10 is used.

The endless tire 1 is welded onto itself at 11 and at 12 and 13 are lateral shoulders and offsets, respectively to be seen, which determine the inclination of the screw or helical fillets 14 by means of the follower rollers.

In Fig. 4, the formation of a bubble 15 is at the starting point the head fillet 16 is shown. In this figure a ring or tire is shown during the folding work, the is released from his role train in order to make certain peculiarities of the procedure more visible.

According to Fig. 1, the tire 1 is turned in the direction of the arrow f1 by rollers 2 and 4 rotating in the direction of arrow f2 and rollers 3 and 5> which rotate in the direction of arrow f3, taken along.

A bubble 17 can be seen upstream of the comb 6 carried by the roller 2. This bubble is relative little developed and between the previously formed groove 18, the tension roller 119, the first roller 20 of the Threaded jaw 6 and through the presence of

109844/1167

en effect of the

its support10 reinforced arched thin sheet metal limited.

The area 21 of the band is at the level of the tip or apex 22 of the groove 18. The roller 20 has the effect that at the first job a half-wave in the direction of arrow f4 (to the right in Fig. 1) is folded or flanged.

On arrival at the second job, the first one flares

en role of the (not visible in the figure) thread baker 9 the half-wave complementary to the groove 23 in the direction of the arrow f5 (to the left in FIG. 1).

The guide rollers anchored in shafts 14 and 18 19 ensure the working angle in relation to the forming rollers.

The mode of operation of the invention will now be illustrated with reference to FIGS. 2 and 3.

In Fig. 2, the combs or threaded jaws 6 * and 7 ^{1 of} a single known job are shown in section along the line H-II in Fig. 1.

If a second job is not planned, as is the case with the state of the art, everyone will move forward

line rotation of the tire 1 the turn of the grooves one step forward. The graph 24- illustrates the formation of the complete wave of the first in the dislocation 13 considered screw turn. It can be seen that this is what is required to fold the groove Smooth sheet metal has been stressed at once, causing an accumulation of strains and internal stresses which results in certain metals, in particular

109844/1167

if the thickness of the sheet is of a relatively significant influence, it is difficult to endure.

The graphic representation 25 shows the folding profile after one complete revolution of the tire and the • Graphic 26 after two turns.

In contrast, according to the invention in FIG. 3, the threaded jaws 6 and 7 are shown in the first working position of the rollers 2 and 3. The graphical representation 27 makes German f lent what is going on, when the first roller 20 occurs with the shoulder and the offset 13 of the tire in engagement {they beads, the half shaft 28 downwards to the direction of the arrow f4 ·.

At the second job in the course of the same. revolution of the tire, the roller 20 'of the threaded jaw 9 mounted on the roller 5 bends the half-shaft 29 upwards back in the direction of arrow f5, © fe * the groove 18 of the first screw turn of the screw or helix 14- completed.

k The step 24- 'of the formation of the first recess takes place thus in two stages and the metal becomes more moltional without accumulation of expansions or bulges Folded in a way to avoid any permanent deformation from the metallurgical point of view.

man

The elongation thus remains below two percent, which / with certain materials, especially those with a contain a high proportion of titanium, must not exceed.

After one complete rotation of the tire comes the Groove 18 under the shaft 30 of the threaded jaw 6 to

109844/1167

Plant and through the exact geometry of this threaded jaw and the complementary grooves arranged opposite this, the exact geometry is completed, those for the screwing or the pitch of the helix

ge will

14- the grooves according to the invention agstrebv; simultaneously the roller 20 flanges the half-shaft 31, and then the roller 20 'of the threaded jaw 9 completes the Groove 23 shown behind bladders 17 and 17 'in Figure 1 as it is being formed.

Stage 25 'is completed and on the following revolution the two successive work stations carry out step 26 'in the same way.

By folding according to the invention by means of half-waves it is possible with the utmost precision to retrieve or require metal of the smooth tire that is to be folded supposed to regulate. The work of the rollers, due to which practically no deformations are exerted on the sheet metal, is accompanied by no noticeable surface wear, which makes it possible to do without post-processing on the folded ones Sheets have a high precision of hundredths of a millimeter in the slope and in the height of the groove and to guarantee such a few minutes in the angles necessary for the subsequent work in the manufacture and use of the sandwich panels is required.

Claims -

109844/1167

Claims (2)

Claims /1.jA device for folding a thin sheet, characterized in that at least two rollers (2, 3) at a first work station, at least two rollers (4, 5) at a second work station, lateral follow-up guide rollers (19) ₅ at each Roll a comb or threaded jaw (6,7 or 8,9) for forming grooves, at least one tensioning roller (119) upstream of each work station and a sheet metal ring or tire (1) welded to itself, which rotates between the two thread combs (6, 7 or 8, 9) each job can be taken away, and that each job by printing the first Roll (20) of the corresponding threaded jaw a fold of a half-shaft (28) of a groove (18) each ensure the following turn of the screw (14) makes, which is screwed in helical form into the threaded jaws, so that a folded tire can be produced without an elongation of 2 % being exceeded at any point on the metal. 2. Apparatus according to claim 1, characterized in that the geometry of the threaded jaws it allows a total of 70 screw turns in the finally relaxed state, a precision of the order of magnitude of 0.2 to 0.5 for the 70 steps to achieve. 109844/1167 Process for folding a sheet of metal curved into an endless soap with the offset front edges below Maintaining an offset (12, 13) are welded by means of a device according to claim 1 or 2, thereby characterized in that the tire (1) so held is between two sets of rollers (2, 3 and 4, 5) from two work stations on a support cylinder (10) is passed that the tire (1) is driven in rotation that the first roller (20) one on one of the rollers of the first job attached threaded jaw causes the folding of a half-wave (28) on the offset (13), by supporting itself on a roller provided on the other roller of the first job, that the folding of the second half-wave (29) of the first screw turn (18) is a helical fold (14) is carried out in the opposite direction by means of two sets of rollers provided at the second work station that with the second rotation of the spindle the first screw turn (18) is engaged in a second track of the first job and so a helix of the grooves (18, 23) is made without at any point of the metal to exceed an elongation of 2% and that two on the metal upstream of each fold of the Head-screw thread (23) appearing bubbles (17, 17 ') between the previous groove (18). the forming roller (20), a tensioning roller (119) and / da-e action of the rigid, full sheet on the side of the .Limited rigid cylinder support (10) / can be used » 109844/1167