DE1944072A1 - Method and device for forming a mouthpiece at a pipe end - Google Patents

Description

DIPL. IXO. W. EITLE DR. HER. NAT. K. HOFFMANN P ATK NT TO WA LTB

JHl. ING. E. HOFFMANN D-BOOO MÖNCHEN 80 · MARIA-THEtESIA-STRASSE 4 ■ TELEPHONE (0811) 441061

Gerard van Kleef, N.V., Oudekerk a / 'd IJssel / Kolland

Method and apparatus for forming a mouthpiece

at one end of the pipe

The invention relates to a method and an apparatus for cold expanding the end of a metallic pipe to form a mouthpiece with a circumferential direction extending shoulder-shaped transition between the Mouthpiece and the non-deformed tube part ...

It is already known a device for carrying out this method, which has a number in a wreath arranged parallel jaws, which can be moved in radial directions on each other; this movement apart is obtained by pushing it in a conical mandrel in the cheek piece. This increases the outer circumference of the jaw rim and that before on this pushed-on pipe end is due to this movement

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widened to a mouthpiece with a larger diameter. In this -Mündstück can not veriorrte end of a side tube are inserted and zv.-Isct.eii this end, and the mouthpiece can be a D ichtun jsorfai. can be used, on this "." iron receives a long conduit composed of several pipe sections. '■. '

For lines in which only a small Oruc-c occurs, a sleeve made of rubber or similar material is often used as a sealing element, v / as a connection is permitted by simply plugging them into each other and guarantee quick and cheap assembly. perform.

The use of such a cuff, however, requires a considerably large space between the mouth— piece and the tube end j inserted into this, this means that the mouthpiece is relatively strongly 'widened must be, whereby the pipe material in the manufacture! - »· ment of the mouthpiece is greatly stretched.

When carrying out such a procedure, na it of the device described above arise however Difficulties when the metal of the pipes * on which Mouthpieces are made against a specific Substance that should flow through the pipes »corrosion-resistant should be. For example, it was found that pipes from a brass area, which is not attacked by household sewage, at the point where the shoulder-shaped transition to the non-deformed pipe part shows strong signs of corrosion. These The most sensitive spot is for this.

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gestelli: »-ial-- this appearance on tensions in the Metal is due to 4this otelle which passes through the expansion of the metal were generated «

..IeI of the invention is this stress corrosion to avoid.

The purpose of the method according to the invention is that the expansion of the pipe begins at the point 2a next to the shoulder-shaped overhang to be formed. On the other hand, in the case of those who have been experienced so far, the mouthpiece is of the same type; it is shaped in the same fashion over its entire course .

The pipe is therefore the first to be whitened in the first place in the saw of the 1 ^ r ^ ustelleadfeni mouth, wholly or partially on the 2ndifla: 3, and after this first expansion, it is dier Foriisi & 1 & -uag? of this operation the ^: remaining ΐβ> ϊί d «@ Bixmdwbüblces is extended. It stelltesicft heräas> ■ DIAE '£ - the non-deformed part ^r d is the tube ,. dbr: is held _iimlrt: in the formation: the: Dog - stiickes on this to gesehobem, namely o% is ea? a distance ^ that in the same; Order of magnitude ;: as- as the · width of the shoulder-shaped overhang lies.1t.- This it; ! IachschieiJen the basic material is presumably · the ür-see: ,, that the tension in the interior of the material; at the stage of the transition between the Setoulter and 'the * nieh1; _: verf ornrfeeÄ- Τ & Ά of the pipe; s; O ^! low 1ο _*; . that ¹ es && daie> seri S ^ eilie " % u None ivorros ion; lcoitpt *

The invention also relates to a device to carry out this procedure. This device can be used in known ways with a number of parallel Be provided jaws, which are arranged in a ring and apart in radial directions. are moveable. According to the invention, this jaw rim at the end to be inserted furthest into the tube the largest outside diameter. The thickest end of the jaw rim, the deepest into the one to be deformed Tube is inserted, pushes when moving apart. the jaws first against the pipe and begins with the formation of the transition between the shoulder and the mouthpiece.

The outer surface of the jaw rim in the closed position, in which all the jaws are close to one another, can be designed in different ways. Preferably However, the jaw rim is given a conical outer surface. The thickest part of this cone-shaped Surface is the first to press against the inner surface of the pipe to be expanded. This is also Material is pushed from the jaws onto the shoulder that is being created. In order to avoid this, according to the invention a small protrusion is provided on each jaw at the end that is furthest into the tube be the one with those provided on the other jaws Projections in the closed position of the jaw rim forms a rib extending in the circumferential direction. According to the invention can also in this outer surface of the Jaw ring one or more along the circumference extending grooves may be provided, through which annular constrictions are formed in the mouthpiece, the

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to hold the later between the mouthpiece and to be attached to an undeformed tube inserted into this. Sealing sleeve can be useful.

According to the invention, the device can also be designed in this way be that the jaws after the initial widening of the pipe near the shoulder can be pivoted slightly with respect to the center line of the jaw crane. In this way a cylindrical and even slightly funnel-shaped mouthpiece can be formed.

V / urther details of the invention will become apparent from the following description of embodiments, wherein reference is made to the accompanying drawings, '^"Au £ this drawing will show"

Pig. 1 shows a longitudinal section through an embodiment the device according to the invention in two positions «

Pig, FIG. 2 shows a longitudinal section through a second exemplary embodiment of the device according to the invention in two Positions,

3 shows a longitudinal section through a with a mouthpiece provided pipe. ''

Only the most important elements are on the figures of the device * The upper half of each figure shows these elements in the position after manufacture a mouthpiece on a pipe and in the lower half in its initial position.

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Pig. 3 shows a. Tube with a shoulder-shaped Transition between the i-mouthpiece and the non-deformed one Pipe part »The above-mentioned corrosion occurs at point A where the shoulder connects to the pipe. This corrosion can be produced in a known manner Mouthpieces due to the occurrence of great tension on them Place caused · In the case of the invention Such tensions are avoided.

In the devices shown in FIGS. 1 and 2 , a mandrel 1 is provided which can be pressed between a number of jaws 2 surrounding the mandrel 1 in a ring-shaped manner by means of devices (not shown). arranged-. Parts 2a and 2b. In the starting position, all parts 2a that are parallel to one another are in contact with one another and form a closed surface onto which the end of the tube (not shown) to be expanded into a mouthpiece is pushed radial directions pushed apart and expand the tube to a mouthpiece. During this movement, the jaw parts 2b are guided between the body 6 of the destruction and an annular plate H- which is attached to the fixed part of the device in a manner not shown. After a mouthpiece has been produced, the mandrel 1 is withdrawn and all jaws 2 are pushed together again by shifting wedge-shaped parts 3, one of which is provided for each jaw 2 and which are jointly surrounded by a support ring 5.

As the figures show, the jaw parts 2a existing wreath at the end of the greatest girth, that

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to lie furthest in a pipe to be expanded (this tube is pushed onto the adjacent jaws from the left in the drawing).

In order to push the material away from the 3aeken towards the mouthpiece during the manufacture of the mouthpiece To reduce forming shoulder, all jaws are provided with a projection 2c, which with the projections 2c of the other jaws together in the closed position of the jaw ring one in the direction of rotation extending butt forms. The remaining surface of the bezel is in the one shown in the figures Conical embodiment, with the! «Inclination. · angle of the cone of clarity is more exaggerated is shown large. Instead of the conical design, the outer surface of the jaw rim can also be different be formed, but must not be larger than at point 2c.

The shaping of the mouthpiece and the shoulder-shaped Transition between the mouthpiece and the undeformed one Pipe part begins at point 2c.

The narrowest position of a mouthpiece that was produced with the device shown on t'ig, 1 is at its free end. If this is not desired or if a funnel-shaped mouthpiece is to be produced, the device shown in FIG. 2 can be used.

In this device a mandrel 1 is provided which comprises two spaced apart one behind the other Has conical parts. The front tapered part ta acts with the jaws 2 in the same way as at the on x-'ig. 1 device shown together.

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The rear tapered part 1b can be placed against the jaws Press provided projections 2d. Furthermore, each jaw part 2b has a projection 2e and the plate 4 is provided with a recess 4a or the like.

like the bottom half of rig. When the mandrel 1 is pushed in, the conical part 1a first presses the jaw parts 2a apart, the jaw parts 2b being guided by sliding themselves on the fixed part 6a and their projections 2e on the flat part of the plate 4. As soon as the dog piece is formed, the rear conical part 1b pushes the projections 2d of the jaws outwards, which is possible because the projections 2e at the ends of the cheek parts 2b face the recess 4a provided in the plate 4. This results in a slight tilting of the jaws (compare the upper half of FIG. 2). Each jaw is pivoted about point 2c, which is supported by the shoulder-shaped transition already formed between the mouthpiece and tube. This pivoting can be so strong that the mouthpiece becomes cylindrical or even funnel-shaped.

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Claims (6)

- 9 claims Process for cold expansion of a metallic pipe end to a mouthpiece with a circumferentially extending, shoulder-shaped transition between Mouthpiece and the rest of the pipe part, thereby indicating that with the expansion of the closest to the shoulder-shaped transition to be formed is started. 2. Device for performing the method according to Claim 1, which are arranged in a ring in parallel and can be moved apart in the radial direction Jaws is provided, characterized in that the "ring" formed by jaws (2) at the end to be inserted first into the pipe has the largest outer diameter. 3. Device according to claim 2, characterized in that it is e k e η η ze Inet that the effective outside laughing Bakken (2) lie on a conical surface in the closed position of the jaw rim ^. Device according to claim 2 or 3 »characterized g e k e η η ζ e i c h η e t that each jaw (2) on the furthest to be introduced into the pipe to be deformed End with a small projection (2c) is provided, which in the closed position of the jaw ring forms with the projections provided on the other jaws a rib extending along the circumference. 5 »Device according to one of claims 2 to ^, characterized denoted that in the entire upper 009811/04 54 -io- surface of all necks (2) one or more circumferentially extending indentations are provided
are, 6. Device according to one 'of claims 2 to 5 »characterized ge ke η η ζ e ic h η et showing the hacroen are movable (2), DAI2 ^s: .e after initial AusV / eiteri of the tubes in the vicinity of the shoulder-shaped Ground the transition slightly angled towards the center line of the jaw rim. 009811/0454 BADORIOiNAL., ""