DE449249C

DE449249C - Method for connecting pipes and sleeves, in particular made of light metal, without soldering, welding or screwing

Info

Publication number: DE449249C
Application number: DEB120543D
Authority: DE
Original assignee: E H RASMUS BECK DR ING
Current assignee: E H RASMUS BECK DR ING
Priority date: 1925-06-28
Filing date: 1925-06-28
Publication date: 1927-09-08

Description

Es ist bekannt, daß veredlungsfähige Leichtmetall-Legierungen, wie sie z. B. unter dem Namen »Duralumin« bekannt geworden sind, durch Erwärmen über 180° eine Einbüße an ihrer Festigkeit erleiden, so daß Rohrverbindungen aus derartigen Leichtmetall-Legierungen nicht durch Löten oder Schweißen hergestellt werden können. Andererseits besteht aber ein großes Bedürfnis, Rohrverbindungen aus derartigen Leichtmetallen, ζ. B. für die Fahrrad-, Fahrzeug- und Flugzeugindustrie, herzustellen.It is known that refinable light metal alloys, such as those used, for. More colorful the name "Duralumin" have become known, a loss due to heating over 180 ° suffer in their strength, so that pipe connections made of such light metal alloys cannot be made by soldering or welding. On the other hand, there is a great need Pipe connections made from such light metals, ζ. B. for bicycle, vehicle and aircraft industry.

Die Erfindung betrifft eine neue Rohrverbindung und ein Verfahren zu ihrer Herstellung und gestattet es, ohne Lötung und Schweißung feste und dauerhafte Rohrverbindungen aus Leichtmetall herzustellen.The invention relates to a new pipe connection and a method for its production and allows solid and permanent pipe connections without soldering and welding made of light metal.

Das neue Verfahren besteht im wesentlichen darin, daß in eine Rohrmuffe eine nach innen sich erweiternde kegelige Bohrung hergestellt, hierauf in diese Bohrung ein Pfropfen mit größerer Konizität als die Bohrung eingesetzt und in den zwischen dem Pfropfen und der kegeligen Muffenbohrung verbleibenden kegeligen Zwischenraum das mit der Muffe zu verbindende Rohr unter hohem Druck eingepreßt wird. Bei diesem Einpressungsvorgang erweitert sich das Rohr unter Abnahme seiner Wandstärke entsprechend der Gestaltung des Pfropfens nachThe new method consists essentially in the fact that in a pipe socket after inside widening conical bore made, then a plug in this bore with a larger taper than the hole used and in between the plug and the conical socket bore remaining conical space with the Socket to be connected pipe is pressed under high pressure. During this press-fit process the tube expands with a decrease in its wall thickness according to the design of the plug

Claims

outside and is firmly fixed between the conical socket bore and the plug.

According to the invention, that which occurs in the tapered expansion of the pipe end Reduction in the wall thickness of the pipe end taken into account that the into the The plug used in the bore has a greater taper than the bore, namely, this mandrel conicity is chosen such that ίο it the cross-sectional reduction of the pipe end exactly takes into account and, as a result, the pipe end everywhere over the entire Press-in length with even, firm pressure between the socket bore and the plug press in.

One produced according to the new process The pipe connection is shown in section in the drawing.

In the angle sleeve α a conical bore is made, which widens towards the inside and is limited at the end by an inner flange or annular stop c. A plug d is inserted into this tapered bore, which has a higher taper on the outside than the tapered socket bore b and which rests with its bottom end against the stop c . The pipe f to be connected to the socket α is cylindrical and is pressed under high pressure in the axial direction into the annular space remaining between the socket α and the plug d. As the injection progresses, the pipe f expands, with the thickness of the wall decreasing as the injection pressure progresses at the end of the pipe. However, since the cone e of the plug d is steeper than the inner cone b of the socket piece a, this reduction in the wall thickness of the pipe is compensated for in such a way that the pipe lies everywhere inside the socket between its bore b and the plug d under high pressure. After the pipe has been pressed in, it is only possible to pull the pipe / out of the socket b by applying very great forces. In order to still secure the connection against rotation, one or more tongues g can be arranged at the end of the tube f , which tongues engage in a corresponding recess in the inner flange c . Also, instead of the Zungeng or with these at the same time, an additional safety device in the form of a cotter pin or pin h can be attached, which passes transversely through the plug d, the pipe f and the sleeve β and not only against rotation, but also against pulling out a forms further backup.

The new method and the socket pipe connection produced afterwards therefore offers the advantage of reliably sitting and holding such connections made of light metal to produce without having to resort to soldering or welding processes Application where there is a risk of a reduction in strength.

The further advantage of the method is that the connection is not bound to a specific external shape of the socket α , but can be used with all possible socket connections.

P / VrENTANSi'Uiieiiii:

ι. Method for connecting pipes and sleeves, in particular made of light metal, without soldering, welding or screwing, characterized in that in a sleeve (α) with a conical inner bore (b) a likewise conical plug (d) of smaller diameter, but with greater conicity, is used, whereupon the pipe (f ) to be connected to the socket (a) into the between the tapered socket bore (■ &). and the conical plug (d) remaining annular space is pressed under high pressure.

2. A pipe connection produced by the method according to claim ι, characterized by one of the conical bore (&) of the sleeve (a) adjoining stop or flange (c), which is used to limit the movement of the plug (ß) during the pipe injection and serves to prevent displacement of the pressed-in pipe within the socket in the direction of the bottom of the cone.

3. A pipe connection produced by the method according to claim ι, characterized by the arrangement of tongues or lugs (g) at the end of the xoo in the sleeve (a) pressed pipe (/), which in corresponding recesses of the stop or flange (c) intervene and thereby secure the pipe (f) ' against twisting in the socket (et).

4. A pipe connection produced by the method according to claim ι, characterized through 'a' through the- socket (α), the tube (f) and the plug (^) continuous connecting element (7i), e.g. B. in the form of a split pin, pin or rivet that prevents the connected parts from twisting and longitudinally sliding secures. - '. 7:

1 sheet of drawings,