DE2027638B2 - DEVICE FOR MAKING A CROSS-CORRUGATED PIPE - Google Patents

Description

35

The invention relates to an apparatus for manufacturing a transversely corrugated pipe with a Large number of adjacent ones in its longitudinal axis, radially by means of a force-exerting device movable plunger that surrounds the pipe on the outside and is profiled on the inside.

With this known device (US Pat. No. 3,457,762), a device provided with transverse waves is made Tube manufactured in two manufacturing steps. First, the pipe is profiled in a wave-like manner, with the individual waves a relatively long length and one decreasing from one pipe end to the other Have outer diameter. In the second step, the profiled tube is placed in a forme cylinder compressed until the transverse wave peaks are in contact with the inner surface of the forme cylinder.

This known manufacturing process is already due to the at least two process steps laborious. In practice, this is followed by a stretching process as the third work step. It also has the Disadvantage that the inner diameter of the transverse wave valleys and the distance between the individual Qucrwcllcn differ from one another and the desired high levels of accuracy cannot be maintained.

It is also known (UK Patent 089) for alignment and profiling only the outer rib !! a tubular body to use plungers, several of which are over at the same time a support surface can be actuated. Through this profiling the outer ribs achieve a larger heat exchange surface.

The invention is based on the object of designing a device of the type mentioned at the outset in such a way that that in a working stroke of the force-exerting device a transversely corrugated tube of great accuracy with regard to the transverse wave spacing and its outer and inner contours as well as with an or several cold-hardened zones of high compressive strength is manufactured.

This object is achieved according to the invention in that for receiving the smooth tube with a Cross shafts equipped expandable inner mandrel is provided and the force-exerting device one that is displaceable coaxially to the longitudinal axis of the tube and is provided at the outer ends of the plunger Control surfaces interacting via an inclined surface, at least in the area of high compressive strength two profile slide rings moving at the same time, but with a movement relative to one another; Pressure ring is.

Provided that at least two profiled tappet wreaths are actuated simultaneously via the inclined surface of the pressure ring, one of which leads the other ¹ .. when the trailing profiled tappet wreath engages the pipe jacket, the flow of the material in the working area of the leading tappet wreath is interrupted. The material required to form the shaft is drawn from the wall thickness within the DIN tolerance. This results in work hardening, which increases the compressive strength for this pipe area.

The pipe areas with lower compressive strength are achieved by using the inclined surface of the pressure ring only one profile ram or a ring of profile rams lying in one plane is operated.

To increase the differences in the compressive strength of the various zones, one can use the The working stroke of the profile ram and thus affect the shaft depth given to the pipe. Also the work surfaces the profile ram of adjacent tool rings or adjacent tool ring groups can be designed differently.

The great accuracy is achieved in the subject matter of the invention by the expandable inner mandrel, the i>; its outer jacket has wave-like profiles that the desired pipe inside correspond.

An embodiment of the invention is shown in figures and is described below. It shows

Fig. 1 the device in plan, partially in section,

2 shows a section along the line H-TI in F i g. 1.

The pipe 1 to be profiled is pushed onto an inner mandrel 2, which in its outer jacket Has wave-like profiles 3, which correspond to the desired inner side of the pipe. The inner mandrel is designed as an expanding mandrel so that it can be moved together radially after profiling and releases the tube for removal from the device.

The pipe is enclosed in a housing4, are mounted in the radially movable profile ram 5, which, as can be seen from FIG. 2, via the Pipe circumference are evenly distributed unc working

influence. This influence can also be caused by scanned waves or zones.

d Allcn ^ ii, uul

The

speaking training of ^the .
kd Pmstößel ei

have surfaces 6 which extend in an arcuate manner according to the outer contour of the tube. In the embodiment, eight profile plungers 5 are combined in a working plane extending transversely to the longitudinal axis of the pipe and form a tool rim. Yes in relation to the longitudinal axis? A plurality of tool rings are arranged next to one another on the pipe. This is shown in FIG. 1. The working surfaces 6 of the profile plungers lying next to one another are, as can be seen from the FIG. This means that * all profile rams on the outer pipe jacket are profiled in a wave-like manner.
Dim * the choice of the shape of the work surface of the

speaking training of ^the . ^If "for _{the prom, the prom} tappet recognizes an advance of the t-rorn

ram of the tool rim following in the direction of movement of the surrounding E "\ ^ _s

This advance means that there will be reflow Material interrupted

Wkff ™ * £ ^ ™^ g £

gg J ^^ J wetn

^{As a result} , ^ ^e _R ^ S can occur, ore zones over the pipe verteui eriuis, the pipe holds zones of different Stauchbeiast

Dim * di W

The profile ram can either be used 15. influenced by WCIc to wave or zone by zone JC *

'The operating stroke of the profile ram is controlled by a Pressure ringS determined which is concentric to the axis? is arranged and moved along this axis Vann. In the case of the FIG. 1 construction shown the working movement of the pressure ring takes place in the direction of arrow 9. The conical surface 10 of the Pressure ring works with the outer control surfaces d filößl E

Cranking 14 namely by ^d ^ Ä ™ _ie ff _st ™ _e ~ r filstößel possesses. In the executive guide

Rod with the 'D ^ -eg ^ SS V

S Vesc- Will

Staff with the '

ran m the j

hen behind the work surface 10
der Druckr.ng ^ «

Pressure ring works with the outer control surfaces direction of the arrow 15 ¹ ^ JJ

or control edges 11 of the profile ram together. It take 25, ^{the singl} ^ ^ ^NEN Benenzungsfläbesteht be an opportunity first of all, by the ZUS ^ JJ ^ d "express limitation ^ appropriate design of the control surfaces or the surfaces ^{of the} _R ^You ^ ^b f ^e _q. ^ch _u ^U _n ^ control edges the working stroke of the profile ram and moved outwards and from the wen _v so that the shaft depth given to the pipe is pulled out of the pipe.

1 sheet of drawings

Claims (3)

Patent claims: 1. A device for producing a transversely corrugated tube with a plurality of juxtaposed, by means of a force-exerting device, radially movable by means of a force-exerting device, the tube on the inside profiled ram, characterized in that for receiving the smooth tube (1) with a An expandable inner mandrel (2) equipped with transverse shafts is provided and the device exerting the force is a coaxially displaceable to the longitudinal axis (7) of the tube (1) with control surfaces (1 \) provided on the outer ends of the tappets (5) via an inclined surface (10 ) is a cooperating pressure ring (8) that moves in the area of high compressive strength at least two profi tappet rims at the same time, but with a relative movement to one another. 2. Device according to claim 1, characterized in that with the pressure ring (S) around the radial stroke of the plunger (5) cranked rods (13) are coupled, each through a series of openings (12) in the longitudinal direction of the device one behind the other plunger (5) are led. 3. Device according to Anspruc '2, characterized in that the crank (14) of the rods (13) is seen in the working direction of the T back (8) behind the working surface (10) of the pressure ring.