EP2545232B1 - Method and device for producing conical pipe sections in helical foundations - Google Patents

Abstract

The invention relates to a method and device for producing conical sections in cylindrical pipes of screw-in foundations by drawing. The device comprises a plurality of press rolling disks (segments) disposed radially about a longitudinal axis of a receptacle for the cylindrical pipe to drawn, pivotable about axes extending transverse and tangential to the longitudinal axis and designed such that the outer circumferential surfaces of the press roller disks (segments) form a developed cone. The device further comprises a drawing die for drawing the pipe along the longitudinal axis through the press roller disks (segments), such that the conical section can be formed by means of the outer circumferential surfaces rolling on the pipe during drawing. Spring elements clamp the press roller disks (segments) against the pipe. A rotary device rotates the pipe for uniform processing thereof.

Description

The invention relates to a method and an apparatus for producing conical pipe sections on cylindrical pipes of screw foundations. Methods and apparatus for producing conical sections on cylindrical, in particular metallic, tubes for producing screw-in foundations for holding components in the ground are known. The conical sections can be produced in different ways, for example by welding prefabricated molded parts or by hammering preferably seamless cylindrical tubes (see. EP 1 105 597 B 1 ). Also, the production by rolling preferably seamless tubes into consideration. According differently, the devices used for this purpose can be designed.

However, the methods mentioned are complicated. Thus, the preparation of prefabricated moldings requires a variety of steps (making the moldings, for example, by cutting, then bending and welding the seams or the like). The production by hammering or rolling cylindrical tubes as such, although problem-free, but requires a lot of equipment for the Hämmer- or the rolling device. The per se conventional hammering is associated with high wear and corresponding noise.

The object is accordingly to provide a method by means of which such conical sections can be produced on cylindrical tubes or conical sections of cylindrical pipes for screw foundations in a simple manner and inexpensively, and to provide an apparatus for performing such a method, as such with reasonable effort can be produced and at the same time with low personnel costs an economical and flawless production of Schraubfundamente allows.

This object is, as far as the device required for it, by the subject matter of claim 1 and, as far as it concerns the process to be taken, by the subject matter of claim 17. The practice of the method by means of the device yields the patent according to claim 24. Expedient developments are defined in the respective subclaims.

According to the invention, the cone-shaped pipe sections are produced by drawing cylindrical, preferably seamless pipes. The device according to the invention serves to carry out this method.

The deformation device has a machining tool which consists of a plurality of pressure roller disks or pressure roller disk segments. These are arranged radially about a longitudinal axis of a receptacle for the cylindrical tube to be pulled. They are further arranged to pivot about the longitudinal axis of the recording transversely and tangentially extending axes and are designed such that their outer peripheral surfaces form a cone in their settlement.

The device further comprises a pulling device. This serves to pull the tube and / or the machining tool along the Längsache such that a relative movement between the pipe and the machining tool takes place, which causes the pressure roll disks or pressure roll disk segments roll with their shaping outer peripheral surfaces on the tube and so in their interaction the conical or teilkonische shaping their settlement transferred to the pipe.

This procedure has significant advantages over the conceivable rolls for producing corresponding conical pipe sections. In particular, the costly drive required for a rolling device is saved. This has particular weight, because in the patented device a plurality of pressure roller discs or pressure roller disc segments is provided. In order to ensure the necessary synchronization of the pressure roll disks or pressure roll disk segments during rolling, each of the disks would have to be driven. However, this requires an expenditure on gearboxes, which hardly have to be accommodated in the required dimensioning, but in any case would be structurally extremely complicated and costly. If the pulling is selected as the machining method, then a drive of the pressure roller disks or pressure roller disk segments is unnecessary, so that alone a considerable reduction of the outlay is achieved. In particular, the structure of segments allows a particularly stable compact design.

The relative movement between the machining tool and the pipe to be drawn can be produced in different ways. It can be held stationary the machining tool and the pipe can be pulled by means of the pulling device. Alternatively, the tube can be held stationary by means of a holding device and the processing tool can be pulled by means of the pulling device. Finally, even both the tube and the machining tool may be movable relative to one another in the relative movement.

In order to ensure a homogenization of the resulting cylinder during the drawing, in particular to minimize burrs between the individual Druckwalzenscheibenabdrücken on the workpiece, it can be provided that the pipe or the machining tool during the drawing is additionally rotated about its longitudinal axis (the longitudinal axis of the receptacle or the tube) , For this purpose, the holding and pulling device can at the same time be configured as a rotating device or the machining tool can be rotatable.

The rotation of the tube or the machining tool must not be a 360 ° rotation. In order to ensure an overlapping processing of the seams between the pressure roller writing or there forming burrs on the workpiece rotation by an angle alpha = 360 °: Roll number x 2, which can be executed stepwise or oscillating is sufficient.

In order to hold the tube, pull and possibly rotate, the device has one or more clamping devices for clamping the tube.

The clamping devices may be designed to be self-locking so that their holding force increases when pulling proportional to the applied tensile forces.

In order to prevent dodging of the tube or tubes from the longitudinal axis of the receptacle during the drawing process, the drawing device conveniently has a linear guide for guiding the tube or tubes and / or the holding, pulling and rotating device and / or the machining tool along the longitudinal axis of the receptacle ,

• Die Druckwalzenscheiben oder Druckwalzenscheibensegmente werden durch das mindestens eine Federelement derart vorgespannt, dass sie sich in der Stellung des engsten Querschnitts ihrer Abwicklung befinden. Wird ein Rohr zu seiner Bearbeitung in die von den Außenumfangsflächen der Druckwalzenscheiben oder Druckwalzenscheibensegmente definierte Aufnahme eingeführt, so trifft es auf diesen engsten Querschnitt ihrer Abwicklung. Beim weiteren Einführen des Rohrs in die Bearbeitungsstellung drängt es die Druckwalzenscheiben oder Druckwalzenscheibensegmente gegen die Kraft des mindestens einen Federelements in Richtung der Stellung des größten Querschnitts (bzw. des dem Rohrquerschnitt entsprechenden Querschnitts) der Abwicklung ihrer Außenumfangsflächen zurück, in der die Bearbeitung des Rohres durch sein Ziehen in Gegenrichtung beginnt.

In order for the outer peripheral surfaces of the pressure roller disks or pressure roller disk segments to be taken along by the shaping during pulling, their frictional engagement with the pipe to be drawn must be ensured at the beginning of the drawing process. For this purpose, the pressure roller disks or pressure roller disk segments are biased by at least one spring element such that they rest on the introduced into the receptacle tube under tension frictionally. This is ensured according to the invention as follows:

• The pressure roll disks or pressure roll disk segments are biased by the at least one spring element so that they are in the position of the narrowest cross section of their settlement. If a tube is inserted into the receptacle defined by the outer peripheral surfaces of the pressure roll disks or pressure roll disk segments for its processing, it encounters this narrowest cross section of its development. Upon further insertion of the tube into the machining position, it urges the pressure roll disks or pressure roll disk segments against the force of the at least one spring element in the direction of the position of the largest cross section (or of the cross section corresponding to the pipe cross section) the settlement of their outer peripheral surfaces, in which the processing of the pipe by pulling in the opposite direction begins.

The spring element (s), with their restoring force directed in the machining direction, then not only ensure uniform contact of the plurality of outer circumferential surfaces of the pressure roll disks or pressure roll disk segments with the pipe, but also assist with this force to a certain extent.

Of course, it is also conceivable to design the device so that the cylindrical tube is introduced in the same direction into the device in which it is withdrawn during machining. This would have the advantage that a reversal of direction between insertion and removal of the tube is avoided. Then, however, the pressure roll disks or pressure roll disk segments for inserting the pipe must be in an open position, because otherwise the pipe can not be inserted. This precludes biasing the pressure rolls or platen segments during insertion of the tube. In order to ensure the entrainment of the pressure roll disks or pressure roll disk segments during drawing, the corresponding pretension must be established after insertion of the pipe and reaching the position in which machining is to commence. In this respect, this solution requires a higher construction cost than the previously described.

The spring element may be, among other things, at least one gas spring or a controlled pneumatic cylinder.

Although the spring elements with their restoring force already provide some assurance for a uniform, synchronous development of the outer peripheral surfaces of the pressure roller disks or Druckwalzenscheibensegmente on the pipe and thus for a desirable faithful transmission of the caliber of settlement on the pipe, so it is advisable, this in addition by synchronously coupling the platen wheels or platen segments.

According to the invention, this is done by a toothing of the discs or disc segments. This may for example be positioned near its outer peripheral edges. As a result, a structurally very unobtrusive and above all a very direct coupling with low friction losses is achieved.

According to the invention, at least 18, preferably 24, more preferably 28, 32 or 36 pressure roll disks or pressure roll disk segments are provided. This plurality of discs ensures accurate, uniform machining of the workpiece.

It is important that burrs on the cone to be formed are avoided. Therefore, the outer peripheral surfaces of the pressure roller disks or pressure roller disc segments in their settlement in turn must fit seamlessly together. To ensure this, the disc edges are chamfered radially.

In order for the outer peripheral surfaces of the discs or disc segments to form a cone tapering in the opposite direction to the processing direction, they must taper towards the apex of the cone. In the case of the multiplicity of pressure roll disks or pressure roll disk segments provided according to the invention, they may therefore be so narrow towards the cone tip that the stability necessary for absorbing the high deformation pressures would be jeopardized. To counteract this, according to the invention it can be provided that the number of disks participating in the deformation is reduced by the course of the deformation process towards ever smaller pipe diameters. This is ensured by virtue of the fact that individual or groups of pressure roll disks or pressure roll disk segments can be radially disengaged during the drawing of the pipe in relation to the remaining pressure roll disks or pressure roll disk segments.

So that cone-shaped sections can be produced on cylindrical tubes of different cross-sections with a drawing device according to the invention, the pressure-roller disks or pressure-roller-disk segments can be exchangeable for disk sets of different caliber.

The application assumes that normally a cone-shaped section is produced in a single drawing operation. However, this can lead to the limits of their load capacity, in particular in the case of particularly strong cylindrical tubes or in the case of particularly strong deformations (high gradients of the conical section to be formed). For such cases, the invention provides that the pulling device is designed for a multi-stage or multi-step pulling. This means that the desired cone is not produced in one operation, but the tube is first introduced in a first step only over part of the distance of the intended cone-shaped deformation in the recording and pulled so that initially only a smaller than the final intended deformation is achieved, and then the tube in one or more further steps Lower part is inserted into the receptacle and pulled until the desired final shape of the cone is made.

As such, according to the manner of forming the outer circumferential surfaces of the pressure roll disks or the pressure roll plate segments, burr formation on the cone shaped portion should be excluded or kept within an acceptable range because the outer peripheral surfaces in the settlement are seamlessly abutted so that there should be no space for burr formation. To further ensure this, for example, in the event that the seamless connection of the outer peripheral surfaces should be affected, for example, by tool wear or other tolerances, in addition, in order to even achieve a homogenization of the cone shape, a rotating device for rotating the tube and / or or of the machining tool about the longitudinal axis of the receptacle during the drawing or between the multiple drawing steps of a multi-step drawing.

The invention further provides a method for producing conical sections on cylindrical pipes of screw foundations by pulling by means of a device according to one of claims 1-16.

For example, this method can also be designed in such a way that the drawing takes place in several steps or steps (multi-step). This is done in such a way that the cylindrical tube for the first drawing stage is only partially inserted into the receptacle and then pulled, then introduced for a second drawing stage a little further into the receptacle and then pulled to finally, in about one third drawing stage to be fully inserted into the receptacle and then pulled so that in this step, the outer peripheral surfaces of the pressure roll disks or Druckwalzenscheibensegmente completely roll on the pipe and completely transfer their execution form on the pipe. For this purpose, a pulling device is to be provided, which allows such a multi-step pulling.

For example, to avoid burring or to compensate for inaccuracies in the cone-shaped portion to be formed, the method may include rotating the tube about its longitudinal axis during the drawing and / or between several consecutive drawing steps. For this purpose, the rotating device is provided.

The method may be further configured such that to produce multiple conical sections of different cross-section and / or different pitch on a cylindrical tube, the plurality of drawing steps are sequentially applied at different locations along the length of the cylindrical tube. For this, the pulling device must be such support multi-step drawing, for example by an adjustable cooperation of pulling device and deformation device such that either a plurality of deformation devices are arranged one after the other and the individual deformation means each have different sets of pressure roll disks or pressure roll segments and the pulling device feeds the pipe to be deformed the respective deformation means, or that the pulling device and the pressure roll disks or segments cooperate in such a way that the pipe to be deformed is successively supplied to the pressure roll disks or pressure roll roll segments corresponding to the respective regions of deformation to be achieved.

The method for producing a plurality of conical sections of different cross-section and / or different pitch on a cylindrical tube is thus also carried out with different sets of pressure roller disks or pressure roller disk segments. For this purpose, unless a separate drawing device is to be used for each caliber, sets of pressure roller disks or pressure roller disk segments of different calibers must be interchangeable.

The invention further provides a method of the aforementioned type for producing a plurality of conical sections of different cross section and / or pitch on cylindrical pipes of screw foundations of a screw foundation, in which a first cone-shaped portion is produced on a pipe of smaller pipe cross section by means of a patented device, then a cylindrical section of a cylindrical pipe of larger pipe cross-section is produced by means of a device according to the invention, wherein a cylindrical end portion of the cylindrical tube of smaller pipe cross-section before or during the production of the cone-shaped portion on the cylindrical tube of larger cross-section in the conical end portion to be deformed and there in the conical deformation is set.

The invention further relates to a method of the aforementioned type, in which to produce a screw of cylindrical tubes of different cross sections with at least one cone-shaped portion a cylindrical tube smaller tube cross-section with one of its end portions before or during the production of the cone-shaped portion of a cylindrical tube larger Pipe cross-section is introduced into the conical end region to be deformed and fixed there with its conical deformation with interference fit.

The invention is finally a Schraubfundament of at least one cylindrical tube having at least one cone-shaped portion, prepared in one of the aforementioned methods

Figur 1:

die erfindungsgemäße Vorrichtung zur Herstellung konusförmiger Abschnitte 1 an zylindrischen Rohren 2 von Schraubfundamenten durch Ziehen in perspektivischer Darstellung;

Figur 2:

eine andere perspektivische Darstellung der erfindungsgemäßen Vorrichtung;

Figur 2a

eine andere perspektivische Darstellung der erfindungsgemäßen Vorrichtung, bei der insbesondere die Klemmeinrichtung (21) der Zieh- und Dreheinrichtung (19, 15) und der Drehwinkel der Dreheinrichtung näher gezeigt sind;

Figur 3:

die erfindungsgemäße Vorrichtung nach Figur 1 und 2 im Schnitt mit Darstellung des zur Bearbeitung in die Aufnahme 6 eingeführten zylindrischen Rohres 2;

Figur 4:

die erfindungsgemäße Vorrichtung nach Figur 1 und 2 im Schnitt mit Darstellung der Endphase der konusförmigen Bearbeitung des zylindrischen Rohres 2;

Figur 5:

die perspektivische Darstellung eines Druckwalzenscheibensegments 3;

Figur 6:

einen Schnitt durch die erfindungsgemäße Vorrichtung;

Figur 7:

eine Draufsicht auf die erfindungsgemäße Vorrichtung mit den Druckwalzenscheiben oder Druckwalzenscheibensegmenten 3;

Figur 8 a - c:

eine Darstellung von drei Phasen des Vorganges der konische Verformung eines zylindrischen Rohres 2;

Figur 9 a - c:

eine Darstellung von drei Phasen des Vorganges der konischen Verformung eines zylindrischen Rohres 2 größeren Querschnitts 17, in dessen konisch zu verformenden Endbereich 19 ein mit einem konusförmigen Abschnitt 1 versehenes zylindrisches Rohr 2 geringeren Querschnitts 16 mit seinem zylindrischen Endbereich 18 eingebracht und dort bei der konischen Verformung des Rohres größeren Querschnitts mit Presssitz festgelegt wird; und

Figur 10 a - c:

eine Darstellung von drei Phasen des Vorganges der konischen Verformung eines zylindrischen Rohres 2 größeren Querschnitts 17, in dessen konisch zu verformenden Endbereich 19 ein zylindrisches Rohr 2 geringeren Querschnitts 16 mit einem seiner Endbereiche eingebracht und dort bei der konischen Verformung des Rohres größeren Querschnitts 17 mit Presssitz festgelegt wird.

Figur 11:

eine Darstellung der erfindungsgemäßen Vorrichtung mit Bearbeitungswerkzeug (3), Halteeinrichtung (20) für das zu bearbeitende Rohr (2) und Zieh-, Dreheinrichtung (10, 15) mit Linearführung (22) für das Bearbeitungswerkzeug (3) und/oder die Halteeinrichtung (20) sowie weiterer Halteeinrichtung (20) für ein zylindrisches Rohr (2) geringeren Rohrquerschnitts (16) das zu seiner Festlegung an dem Rohr (2) größeren Rohrquerschnitts (17) in dessen konisch zu verformenden Endbereich (19) eingebracht werden kann.

The invention will now be further described with reference to the drawings. Showing:

FIG. 1:

the device according to the invention for producing conical sections 1 on cylindrical tubes 2 of screw foundations by pulling in perspective view;

FIG. 2:

another perspective view of the device according to the invention;

FIG. 2a

another perspective view of the device according to the invention, in which in particular the clamping device (21) of the drawing and rotating means (19, 15) and the rotation angle of the rotary device are shown in more detail;

FIG. 3:

the device according to the invention FIG. 1 and 2 in section with representation of the introduced for processing in the receptacle 6 cylindrical tube 2;

FIG. 4:

the device according to the invention FIG. 1 and 2 in section showing the final phase of the cone-shaped machining of the cylindrical tube 2;

FIG. 5:

the perspective view of a printing roll wheel segment 3;

FIG. 6:

a section through the device according to the invention;

FIG. 7:

a plan view of the device according to the invention with the pressure roller disks or pressure roller disc segments 3;

FIG. 8a-c:

a representation of three phases of the process of conical deformation of a cylindrical tube 2;

FIG. 9a-c:

a representation of three phases of the process of conical deformation of a cylindrical tube 2 of larger cross-section 17, in its conical end portion to be deformed 19 provided with a conical portion 1 cylindrical tube 2 smaller cross-section 16 with its cylindrical Inserted end portion 18 and is fixed there in the conical deformation of the tube of larger cross-section with interference fit; and

FIG. 10 a - c:

a representation of three phases of the process of conical deformation of a cylindrical tube 2 larger cross-section 17, in the conical end portion 19 to be deformed a cylindrical tube 2 of smaller cross-section 16 introduced with one of its end regions and there in the conical deformation of the tube larger cross section 17 with a press fit is determined.

FIG. 11:

a representation of the device according to the invention with a machining tool (3), holding means (20) for the pipe to be machined (2) and drawing, rotating means (10, 15) with linear guide (22) for the machining tool (3) and / or the holding device ( 20) and further holding means (20) for a cylindrical tube (2) smaller tube cross-section (16) for its attachment to the tube (2) larger tube cross-section (17) can be introduced in its end portion (19) to be deformed conically.

FIG. 1 shows the inventive device for producing at least one conical section (1) ah cylindrical tubes (2) of screw foundations by pulling. The device has a multiplicity of pressure-roll disks or pressure-roll-disk segments (4) which are arranged radially about a longitudinal axis (5) of a receptacle (6) for the cylindrical pipe (2) to be drawn and about axes transversely and tangentially to the longitudinal axis (5) ( 7) are arranged pivotably and are formed such that the outer peripheral surfaces (8) of the pressure roller disks or pressure roller disk segments (3) form a cone in their development.

Shown are finally spring elements (11) in the manner of gas pressure springs (12), by means of which the pressure roller disks or pressure roller disc segments (4) are biased.

Also shown is a device (10) for pulling and / or rotating (15) the tube (2) by means of which the tube (2) can be pulled along the longitudinal axis (5) through the pressure roll disks or pressure roll disk segments (4), in that the cone-shaped section (1) can be formed by means of the outer peripheral surfaces (8) rolling on the tube when pulled.

FIG. 2 shows a different perspective view of the device according to the invention FIG. 1 , It differs from the presentation FIG. 1 in that instead of the a plurality of spring elements (11) in the form of guest compression springs (12) only a single such element (11, 12) is shown. In addition, the teeth (13) are shown here, by means of which the pressure roller disc segments (4) are synchronously coupled together.

FIG. 2a shows a different perspective view of the device according to the invention FIG. 2 in which in particular the clamping device (21) of the drawing and rotating device (10, 15) and a rotation angle (23) of the rotating device (15) are shown. This rotation angle (23) is according to the formula Alpha = 360 °: number of rolls x 2 held so that it allows the smallest possible angle of rotation, the machining of the burrs that can arise between the effective ranges of the pressure roller discs or pressure roller disc segments (4).

FIG. 3 shows the device according to the invention FIG. 1 and 2 in section with pressure roller disc segments (4), which radially around a longitudinal axis (5) of a receptacle (6) for the cylindrical tube to be pulled (2) and about the longitudinal axis (5) transversely and tangentially extending axes (7) pivotally mounted and such are formed such that the outer peripheral surfaces (8) of the disk segments (4) form a cone in their development.

Shown are spring elements (11) in the manner of gas pressure springs (12), by means of which the discs or disc segments (4) are biased.

Shown further is in the receptacle (6) introduced to be machined cylindrical tube (2) in the position at the beginning of processing by pulling.

FIG. 4 shows the device according to the invention FIG. 1 . 2 and 3 in section with pressure roller disc segments (4), which radially around a longitudinal axis (5) of a receptacle (6) for the cylindrical tube to be pulled (2) and about the longitudinal axis (5) transversely and tangentially extending axes (7) pivotally mounted and such are formed such that the outer peripheral surfaces (8) of the disk segments (4) form a cone in their development.

Shown are spring elements (11) in the manner of gas pressure springs (12), by means of which the discs or disc segments (4) in accordance with the representation / the method section according to Fig. 3 are biased.

Also shown is the cylindrical tube (2) to be machined inserted into the receptacle (6) in the position of the final phase of machining by pulling, ie with an already formed conical section (1) in the form of a cone (9).

Shown is also a device (10) for drawing and rotating (15) of the tube (2) in half, by means of which the tube (2) along the longitudinal axis 5 through the pressure roller disc segments (4) has been pulled such that when pulling on the tube (2) rolling outer peripheral surfaces (8) of the cone-shaped portion (1) has been formed.

FIG. 5 shows a platen segment (4) in perspective view. Shown is the axis (7) of the segment and its outer peripheral surface (8), further the toothing (13) in the edge region (14) of the disc (4). There is also the chamfer recognizable, by means of which it is ensured that the pressure roller disc segments (4) in the installed state at their during the deformation of the pipe section (2) to the cone (9) taking place unwinding on the one hand, on the other hand in order to achieve the most uniformly deformed and clean cone surface as seamlessly as possible.

FIG. 6 shows a plan view of the device according to the invention. Visible are the pressure roller disc segments (4) with their outer peripheral surfaces (8). Visible is further recording (6) for the pipe to be machined (2) with its longitudinal axis (5). Mounting holes for retaining tabs for biasing members (11, 12) for the disks or disk segments (4) are also shown.

FIG. 7 shows a plan view of the device according to the invention. Visible are the pressure roller disc segments (4) with their outer peripheral surfaces (8). Visible is further recording (6) for the pipe to be machined with its longitudinal axis (5). Also indicated is the toothing (13) of the pressure roller disc segments (4) provided on the disc edges (14). The disks / disk segments (4) have such a thickness that, on the one hand, a transmission of the high deformation forces is possible, but on the other hand, all disks (4) just do not interfere with the smallest cone diameter, but bear against the cone surface almost completely.

FIGS. 8 a - c show the process of conical deformation of a cylindrical tube (2) in three phases. Here, the cylindrical tube (2) as (in an earlier operation) already drawn with a cone-shaped portion (1) drawn. The FIGS. 8 a - c show the process of further conical deformation of the conical section (1) in three steps.

In Fig. 8a the tube (2) to be deformed is introduced into the device so far that the pressure roller disc segments (4) with their smallest radius just the surface of the to be deformed Touch pipe (2) at the point where a further deformation to a longer cone section (1) on the pipe (2) set.

Fig. 8 b shows that half of the process of further verification has already taken place. The end cone (1) to be achieved is indicated by the dot-dash line. And finally is in

Fig. 8 c the state of the conification is shown in which the narrowest Konifizierungdurchmesser is achieved precisely by the fact that the pressure roller disc segments (4) have formed this area of smallest cone diameter, in that each pressure roller disc segments (4) face with their largest radius.

Figures 9 a - c show three chamfers for the production of a screw foundation with two cone-shaped sections (1) of cylindrical tubes (2) of different cross-sections (16, 17).

The figures show a cylindrical tube (2) of larger cross section (17), which was introduced in the longitudinal axis (5) of the receptacle (6) in this recording.

Shown further is another cylindrical tube (2) of smaller tube cross-section (16) with a conical portion (1), with its cylindrical end portion (18) for insertion into the conically deformed end portion (19) of the tube larger tube cross-section (17) axially geared towards this.

Shown are on axes (7) pivotally mounted pressure roller disc segments (4) with their outer peripheral surfaces (8) for generating a conical portion 1 at the conically deformed end portion (19) of the tube (2) larger pipe cross-section (17).

FIG. 9a shows the device after insertion of the cylindrical tube (2) larger tube cross-section (17) in its longitudinal axis (5) in the receptacle (6). The tube (2) and the pressure roller disc segments (4) are in the open position, the position in which the machining of the end portion (19) to be conically deformed by pulling off the tube (2) and roll-rolling the outer peripheral surfaces (8) of the pressure roller disc segments (FIG. 4) should begin. The cylindrical end region (18) of the tube (16) of smaller tube cross-section is not yet introduced into the conical end region (19) of the tube (17) of larger tube cross-section.

FIG. 9b shows the same device after introduction of the cylindrical end portion (18) of the tube (2) smaller pipe cross-section (16) in the conically deformed end portion (19) of the tube (2) larger pipe cross-section (17).

The cylindrical tube (2) larger cross-section (17) is already drawn about halfway here. The deformation of the conically deformed end portion (19) of the tube (2) larger pipe cross-section (17) has already been done to some extent.

FIG. 9c shows the state at the end of the drawing and deformation process. The deformation of the conically deformed end portion (19) is completed. The tube (2) of smaller tube cross-section (16) is fixed there by its conical deformation in the end region (19) of the tube (2) larger cross section (17) part by its conical deformation there with interference fit.

Figures 10 a - c show the same device and the same processing steps of the deformation of an end region (19) of a cylindrical tube (2) of larger cross section (17) and the molding of a cylindrical tube (2) of smaller cross section (16) with its cylindrical end portion 18 in the conically deformed end portion of the tube (2) larger pipe cross-section (17) is introduced and fixed there with the conical deformation of the end portion to be deformed 19 of the pipe larger cross-section 17 with a press fit, as to FIG. 9a-c shown and described.

The Figures 10 a - c are different from Figures 9 a - c consequently only in that the cylindrical tube (2) of smaller tube cross-section (16) has no cone-shaped section (1), but overall is substantially undeformed cylindrical. Substantially undeformed here means that only in the connection region, in which both tube parts were pressed together or pressed together, a certain deformation of the cylindrical tube (2) smaller pipe cross-section (16) takes place.

FIG. 11 shows a device according to the invention with a machining tool (3) consisting of pressure roller disc segments (4) which are arranged around the longitudinal axis (5) of the receptacle (6) on axes (7). In the receptacle (6) is a cylindrical tube (2) larger tube cross-section (17) in longitudinal direction on the longitudinal axis (5) of the receptacle (6).
The tube is inserted into the receptacle (6) so far that the pressure roller disc segments (7) are in their maximum open position and abut the tube to its conical deformation. The tube (2) is held by a holding device (20) by means of clamping device (21) stationary and in the longitudinal axis (5) of the receptacle (6), possibly also of the rotating device (15) rotated during machining and / or pulled by the pulling device (10) under linear guidance by the linear guide (22).

The machining tool (3) in turn is guided linearly by means of the linear guide (22) in the longitudinal axis (5) of the receptacle (6) and can be rotated by a rotating device (15) and / or pulled by the pulling device (10). This design includes the possibility, on the one hand only to move the machining tool (3) through the rotary and / or the pulling device (10. 15), or on the other hand, only the holding device (20) with the rotary and / or pulling device (10 ) or to move both the processing and the holding device (3, 20) relative to each other.

A cylindrical tube (2) of smaller tube cross-section (16) is in turn held by a further holding device (20a) with clamping device (21 a) in alignment with the longitudinal axis (5) of the receptacle (5) and by means of the linear guide (22) in the longitudinal axis (5) of the receptacle (6), in such a way that it can be introduced into its conical end portion (19) to be fixed to the tube (2) of larger tube cross-section (17).

reference numeral

1

cone-shaped section

2

cylindrical tube

3

processing tool

4

Platen rolls or platen segments

5

Longitudinal axis of the receptacle 6 and the tube 2

6

admission

7

Axes of the pressure roller disks or pressure roller disk segments 4

8th

Outer peripheral surfaces

9

cone

10

puller

11

spring elements

12

Gas springs

13

gearing

14

Edge area of the pressure roll disks or pressure roll disk segments 4 (chamfer)

15

rotator

16

smaller pipe cross-section

17

larger pipe cross-section

18

cylindrical end portion of the tube 2 smaller pipe cross-section 16th

19

conically deformed end portion of the tube 2 larger pipe cross-section 17th

20

holder

21

clamper

22

linear guide

23

angle of rotation

Claims (24)

1. Apparatus for producing at least one conical section (1) on cylindrical pipes (2) of screw foundations by drawing, with a processing tool (3) which comprises a plurality of pressure roller discs or pressure roller disc segments (4) which are arranged so as to be pivotable radially about a longitudinal axis (5) of a receptacle (6) for the cylindrical pipe (2) to be drawn and about axes (7) extending transversally and tangentially with respect to the longitudinal axis (5) and are designed in such a way that the outer circumferential surfaces (8) of the discs or disc segments (4) form a cone (9) in their developed view, and with a drawing device (10) for drawing the pipe (2) and/or the processing tool (3) along the longitudinal axis (5) in such a way that the conical section (1) can be formed by means of a relative movement between the pipe (2) and the processing tool (3) and by means of the outer circumferential surfaces (8) of the pressure roller discs or pressure roller disc segments (4) which roll on the pipe.
2. Apparatus according to Claim 1, characterized in that the processing tool (3) is held in a stationary manner and the pipe (2) can be drawn by means of the drawing device (10).
3. Apparatus according to Claim 1, characterized in that the pipe (2) is held in a stationary manner by means of a holding device (20) and the processing tool (3) can be drawn by means of the drawing device (10).
4. Apparatus according to Claim 1, characterized in that the pipe (2) and the processing tool (3) can be drawn with respect to one another in the relative movement.
5. Apparatus according to Claim 1, characterized in that the drawing, or rotating or holding device (10, 15, 20) for the pipe (2) has a clamping device (21) for securely clamping the pipe (2).
6. Apparatus according to Claim 5, characterized in that the clamping device (21) is designed in a self-locking manner.
7. Apparatus according to one of the preceding claims, characterized in that the pipe (2) and/or the holding, drawing and rotating device (10, 15, 20) and/or the processing tool (3) are guided by means of a linear guide (22) along the longitudinal axis (5).
8. Apparatus according to one of the preceding claims, characterized in that the pressure roller discs or pressure roller disc segments (4) are preloaded by at least one spring element (11) in such a way that they bear frictionally against the pipe (2) introduced into the receptacle (6).
9. Apparatus according to Claim 8, characterized in that the spring element (11) is a gas compression spring (12).
10. Apparatus according to one of the preceding claims, characterized in that the pressure roller discs or pressure roller disc segments (4) are coupled synchronously to one another.
11. Apparatus according to Claim 10, characterized in that the synchronous coupling of the pressure roller discs or pressure roller disc segments (4) is formed by a toothing (13) of the pressure roller discs or pressure roller disc segments (4).
12. Apparatus according to one of the preceding claims, characterized in that at least 18, preferably 24, more preferably 28, 32, or 36, pressure roller discs or pressure roller disc segments (4) are provided.
13. Apparatus according to one of the preceding claims, characterized in that individual or groups of pressure roller discs or pressure roller disc segments (4) are radially disengageable with respect to the other pressure roller discs or pressure roller disc segments (4).
14. Apparatus according to one of the preceding claims, characterized in that the pressure roller discs or pressure roller disc segments (4) can be interchanged for pressure disc or pressure disc segment sets (4) of another gauge.
15. Apparatus according to one of the preceding claims, characterized in that the drawing device (10) is designed for multi-step drawing.
16. Apparatus according to one of the preceding claims, characterized by a rotating device (15) for rotating the pipe (2) about its longitudinal axis (5) during the drawing or between the multiple drawing steps of the multi-step drawing.
17. Method for producing conical sections (1) on cylindrical pipes (2) of screw foundations by drawing by means of an apparatus according to one of Claims 1-16.
18. Method according to Claim 17, characterized in that the drawing takes place in multiple steps.
19. Method according to either of Claims 17 and 18, characterized in that the pipe (2) is rotated about its longitudinal axis (5) during the drawing and/or between the multiple drawing steps.
20. Method according to either of Claims 18 and 19, characterized in that the multiple drawing steps are applied at different points of the length of the cylindrical pipe (2) to produce multiple conical sections (1) of different cross section and/or different gradient on a cylindrical pipe (2).
21. Method according to one of Claims 18-20, characterized in that different sets of pressure roller discs or pressure roller disc segments (4) are used to produce multiple conical sections (1) of different cross section and/or different gradient on a cylindrical pipe (2).
22. Method according to one of Claims 17-21, characterized in that, in order to produce multiple conical sections (1) of different cross section and/or different gradient on cylindrical pipes (2) of screw foundations, a first conical section (1) is produced on a cylindrical pipe (2) of smaller pipe cross section (16) by means of an apparatus according to one of Claims 1-16, and then a conical section (1) is produced on a cylindrical pipe (2) of larger pipe cross section (17) by means of an apparatus according to one of Claims 1-16, wherein a cylindrical end region (18) of the cylindrical pipe (2) of smaller cross section (16), before or during the production of the conical section (1) on the cylindrical pipe (2) of larger cross section (17), is introduced into its end region (19) to be deformed conically and is fixed there with a press fit during the conical deformation.
23. Method according to one of Claims 17-19, characterized in that, to produce a screw foundation from cylindrical pipes (2) of different cross sections (16, 17) having at least one conical section (1), a cylindrical pipe (2) of smaller pipe cross section (16) is introduced with one of its end regions, before or during the production of the conical section (1) on a cylindrical pipe (2) of larger pipe cross section (17), into its end region (19) to be deformed conically and is fixed there with a press fit during its conical deformation.
24. Screw foundation consisting of at least one cylindrical pipe (2) with at least one conical section (1), produced in a method according to one of Claims 17-23 by drawing.

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