DE1257087B - Process for producing flexible metal frames - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

B21c

German KL: 7b -15/01

Number: 1257 087

File number: T188661 b / 7 b

Filing date: August 18, 1960

Open date: December 28, 1967

The invention relates to a method of manufacturing having a number on the inside thereof Rings arranged in corrugations reinforced metal bellows, with those made of smooth tubes and in themselves closed rings is assumed, the reinforcement rings before the pre-rolling of the circumferential grooves used, during the deformation of the smooth tube to the bellows at the same time in the folds rolled in and held in place by the successive waves.

Flexible metal bellows find numerous applications, especially in connection with measuring or Control instruments, expansion joints or flexible joints. The bellows are subject to either internal or external overpressure. It is known that it is a cheapest There is a relationship between the length and diameter of the bellows, provided that it is not reinforced. Otherwise can be the relatively small differences that exist between the individual wells or ribs, bulges or other damage if the bellows is long, especially at higher pressures. It is also necessary for bellows that operate at higher pressures should to use a material of sufficient thickness that not only withstands the pressure difference between the external and inside of the bellows, but also ensures the required stability. The consequence is then however, a reduced flexibility or the need to accept higher adjustment forces have to.

To avoid these disadvantages, it is already known to have outer reinforcing rings or segments on the To arrange the bottom of the grooves between the individual corrugations of the bellows, if with increased internal pressure is being worked on.

Furthermore, a flexible metal bellows is known which is reinforced inside with rings so that it is outside increased pressure can be applied. The advantages of such internal reinforcements Metal bellows are known, but there is a significant difficulty in their manufacture, and because of the insertion of the reinforcement rings into each inner groove, since the reinforcement ring is a must have a larger diameter than the smallest inner diameter of the bellows.

In the production of flexible metal bellows provided with reinforcing rings, it is already known to use a cylinder made of elastic material, which is recessed on its circumference is provided to accommodate the reinforcement rings. The cylinder is at both ends Process for making flexible metal bellows

Applicant:

Teddington Bellows Limited,

Sunbury-on-Thames, Middlesex (Great Britain)

Representative:

Dipl.-Ing. A. Spalthoff, patent attorney,

Essen, Pelmanstr. 31

Named as inventor:

William Frederick Forrest Martin-Hurst,

Scethrog, South Wales (UK)

Claimed priority:

Great Britain August 18, 1959 (28211) -

closed, with a tube opening into the interior of the cylinder through the head side. after the Reinforcement rings are inserted into the circumferential grooves of the cylinder, this is pushed into the smooth tube and pressurized its interior so that the cylinder expands radially, the Reinforcement rings come to rest on the wall of the pipe, which is also connected to a pressure medium source is connected and its interior experiences a pressure change at the same time. after the Reinforcing rings are thus set, the interior of the elastic cylinder becomes with the atmosphere in Connection set so that the overpressure can escape and the cylinder returns to its original state Assumes scope and can therefore be pulled out of the pipe to be deformed. Now rings are placed on the pipe to be deformed, which rest against the two outer corrugations and pushed together so that the reinforcement rings are fixed in the corrugations. However, this method of introducing the reinforcement rings is particularly important because of the pressure medium supply into the interior of the elastic cylinder as well as into the pipe to be deformed and the resulting pipe Seals are extremely complex and time-consuming.

Proceeding from this prior art, the object of the invention is to provide a method for Manufacture of reinforced rings

709 710/182

3 4

to create flexible metal bellows, which are used in a simple number of reinforcement rings and the-

Way is feasible and a number of grooves is rolled against bulging, which the

or other damage-resistant number of ribs for the desired length of the bellows.

Metal bellows results. speaks.

According to the invention, this is achieved by 5 The result of the first method stage is

that in a known way the individual wave troughs are two things, namely

one after the other before and then one after the other finished a) the reinforcement rings in the correct position

shaped and the individual rings each bring before and

Deform a wave trough up to the stop at b) the distance between the individual corrugations

to fix the already preformed previous wave trough in io of the bellows.

the pipe to be inserted. In this way, F i g. 2 it can be seen that the

the reinforcement rings one after the other in the smooth distance χ between the inner rollers of the inner

Pipe part inserted, up to the stop domes determined the part of the pipe length that is used for

to the already preformed previous wave trough, formation of the final shape of the corrugations

so that there is a continuous workflow. 15 is required.

In addition, to introduce the reinforcement _z . _V out stage
rings m the smooth part of the pipe to be deformed

serving mandrel as well as the concave and convex from- Work process 6: As from F i g. 6 can be seen who educated Rolls for producing the shafts also have a concave inner one in this process stage neatly structured and easy to use. Im 20 roller 9 and two convex outer rollers 10 on principle are those used for roughing and finishing. The distance between the two outer rollers Wave troughs used tools already known. is less than the distance between the two inner

An embodiment of the invention is now zen 5 and 6, which bean in the first process stage Hand illustrated by figures, namely show uses were made. By depressing the outer

F i g. 1 to 8 different stages of the rolling 10 is a deepening of the initial grooves

position of the inside reinforced bellows applied and a corresponding reduction

Method and the distance between adjacent reinforcement

9 and 10 show two embodiments of solid rings or tubular corrugations. This operation

permanent bellows. is repeated according to that in the finished bellows

The method according to the invention comprises a desired wave number,
number of operations to be divided into appropriate groups

be subdivided so that a multi-stage process ^Dntte process stage

arises. The various work processes and methods. Work process 7: From FIG. 7 showing a representation

Driving stages are formed one after the other on a larger scale in the following, it can be seen that in

described. 35 of the third process stage two inner concave waI

First process stage ^zen ^ - are used and an outer convex

Roller 12. The distance between the two inner ones

Operation 1: The reinforcement ring 1, the one with rollers 11 is smaller than the one between

Tight fit or a slight oversize in the tube 2 the two outer rollers 10 of the process stage 2,

fits is in its position by an annular ₄₀ that is, it is somewhat less than the distance of the loading

Mandrel 3 or a similar tool pressed, as in adjacent reinforcement rings in the position that these

F i g. 1 shown. The rotating rolling mandrel 4 has at the end of the second process stage,

a concave inner roller 5 and a convex inner one. This means that, as shown in FIG. 7 can be found

Roller 6, while a single convex free roller 7 at the beginning of the work process 7 the reinforcement

is arranged outside the tube. ₄₅ rings are not flush or exactly match the

Working process 2: The rolling mandrel 3 will be recessed rollers 11, but more or less pulled and the tube 2 advanced so far that only rest on its outer edge. However, when the ring 1 rotates in the cavity of the concave roller 5, the mandrel 13 and the outer roller 12 engages down. F i g. 2 shows the state of the parts shortly before being pressed, the reinforcement rings come near-start of the rolling process. ₅ o immediately into the position shown in FIG. 8, with

Operation 3: The outer roller 7 is pressed against the groove between the adjacent corrugations of the

pressed the tube, as shown in FIG. 3 can be seen until Rohres is deepened accordingly and the walls

to a predetermined level. At the same time the groove will be placed parallel,

that the roller and the tube are set in rotation, so the result of the three processes described

that in the tubular body there is initially a comparatively 55 steps, an internally reinforced flexible metal bellows,

forms a flat initial groove. which has practically parallel walls, as shown in FIG. 9

Work process 4: The rolling can be seen interrupted. The bellows can already be in this state

and the roller 7 is withdrawn. Then means will be used for a number of applications,

of the press mandrel 3, a further reinforcing ring 8, however, if greater flexibility is required

set, as in FIG. 4 shown. 60, this can be done by an additional work

Operation 5: The relative position of the rollers to the gang can be obtained. The ends of the

The pipe is now changed so that the second bellows is now clamped, as indicated at 14 in FIG

Ring 8 engages the concave roller 5, as is in Fig. 4, so that the bellows is an external hydraulic

F i g. 5 shown. It can then be subjected to a second transfer printing. This is done because

Catch groove rolled between the convex roller 6 55 by that one that is closed at its ends

and the ring 8. Bellows arranged in a chamber in which he a

The above-described work schedule is sufficiently high external hydraulic pressure

courses 1 to 5 are repeated until a suitable one is subjected until the indentations become permanent

Claims (6)

on the from FIG. 10 have deformed apparent annular or toroidal cross-section. Patent claims: 1. A method of manufacturing a number arranged on the inside of their corrugations Rings reinforced metal bellows, those made of smooth tubes and self-contained Rings is assumed, the reinforcement rings are inserted before the pre-rolling of the circumferential grooves, rolled into the folds at the same time as the smooth tube is deformed into the bellows and held in place by the successive waves, thereby characterized in that, in a known manner, the individual wave troughs one after the other before and then finished one after the other and the individual rings each before deforming a valley be inserted into the tube as far as it will go against the preformed previous wave trough. 2. The method according to claim 1, characterized in that the radius of the rings is almost corresponds to the radius of the cross-section of the inner surface of a finished bellows rib. 3. The method according to claims 1 and 2, characterized in that the finish-rolled The bellows is subjected to an external hydraulic pressure in a known manner. 4. Apparatus for performing the method according to claims 1 and 2 with a retractable insertion device for the reinforcement rings into the pipe, characterized in, that an axially movable punch is provided as an insertion device. 5. Apparatus for performing the method according to claims 1 and 2 with am Outside diameter of the starting pipe attacking rollers and further, on the inside diameter of the pipe attacking, possibly seated on a common shaft counter-rollers for pre-rolling and finishing of the wave troughs, characterized in that the pushed-in Rings pressing counter-rollers are concave on their outer surfaces and the counter-rollers pressing directly on the pipe are known Way are convex on their outer surfaces. 6. Apparatus according to claim 5, characterized in that adjacent counter-rollers at the final rolling of the wave troughs in a known manner have a distance that corresponds to the distance corresponds to the reinforcement rings in the finished metal bellows. Considered publications:
German patent specifications No. 540 246, 540 061,
528412; British Patent No. 778,689;
U.S. Patent No. 2,446,281. 1 sheet of drawings 7D9 710/182 12. 67 © Bundesdnickerei Berlin