WO2015120840A1

WO2015120840A1 - Thread rolling tool

Info

Publication number: WO2015120840A1
Application number: PCT/DE2015/100048
Authority: WO
Inventors: Philipp Silberkuhl
Original assignee: Rothenberger Ag
Priority date: 2014-02-12
Filing date: 2015-02-06
Publication date: 2015-08-20
Also published as: JP2017505233A; DE102014202579A1; US20160354834A1; DE112015000760A5

Abstract

The invention relates to a thread rolling tool for rolling and/or repairing a thread, comprising a clamping device (12) to be fastened to a pipe end (18), and at least one profiled roll (14.1) for rolling a thread into the pipe end (18) or repairing a thread at the pipe end (18). According to the invention, the at least one profiled roll (14.1) tapers in a direction in which the profiled roll (14) advances such that a tapered, in particular a conical, thread can be rolled into the pipe end (18).

Description

Thread rolling tools

The invention relates to a thread rolling tool for rolling and / or repairing a thread, having (a) a

Clamping device for attachment to a pipe end and (b) at least one profile roller for rolling a thread in the pipe end or for repairing a thread at the pipe end.

Such a thread rolling tool is known for example from DE 10 2012 004 701 AI. A disadvantage of one

such thread rolling tool is that it is suitable only for cylindrical threads. In other words, conical threads are not rollable with such a tool.

The invention is based on the object

Thread rolling tool to be proposed for rolling and / or repairing a tapered, in particular a

conical, thread is suitable.

The invention solves the problem by a generic thread rolling tool, in which the at least one

Profile roller tapers in a feed direction of the profile roller, so that a tapered, in particular a conical, thread in the pipe end is rollable.

The invention is based on the finding that a conical thread can be generated when a conical

Profile roll is used. Will this profile roll on the Tube end, which tapers, in particular conically, tapers, so the profile roller comes into contact with the pipe end over a large portion of its lateral surface. By rotating the profile roller on a helical track about the longitudinal axis of the pipe end, the profile roller introduces a thread into the pipe end. The envelope contour of the profile roll, ie the contour of the

Profile roll without the grooves, is therefore preferred

complementary to the contour to be achieved

tapered thread formed.

It is particularly favorable if the profile roller has a conical basic structure, that is to say that the groove peaks lie on a conical surface. In this way one becomes

obtained conical thread.

In the context of the present description, the clamping device is understood to mean a device by means of which the thread rolling tool can be fastened to the pipe end. In particular, the tensioning device is configured to be inserted into the pipe at the pipe end and to secure the thread rolling tool to the pipe end by increasing the outside diameter of the pipe

Clamping device, for example by radial

Moving out of tensioning elements. The tensioning device can be actuated mechanically, pneumatically or hydraulically.

In principle, the tensioning device can also be based on a different tensioning principle, for example representing a freezer chuck. But this is often with increased effort

connected . The profile roller is understood to be a component by means of which a thread can be rolled into the pipe end.

Preferably, the profile roller has a conical envelope contour, the means that the profile roller in the section, which has the profile used for rolling the thread through

Incorporation of the profile in a conical section

can be produced.

Under the feature that a thread in the pipe end is rollba, is in particular also understood that an existing but damaged thread by means of

Thread rolling tool can be changed so that a functional thread is created.

Preferably, the profile roller is gradientless. This has the advantage that the thread with a particularly high

Process reliability and easily rolled and / or repaired.

According to a preferred embodiment, this includes

Thread rolling tool a roller receptacle on which the at least one profile roller is attached and by means of which at least one profile roller helically so around the pipe end is feasible, that the at least one profile roller a thread in the

Pipe end rolls. The fact that the profile roller can be guided helically around the end of the pipe is added

understood that it is feasible on a, in particular non-tapered, screw path around the longitudinal axis of the pipe end around. Although it is possible that the

Tapered tapered, that is, that their diameter decreases with increasing distance along the longitudinal axis, but this is not necessary. In addition, it is possible that widened the screw path. This is especially easy

Thread rolling tool, however, constructed when the roll receiving moves on a neither tapered nor widening helical path about the longitudinal axis.

The roller receptacle is preferably coupled to the tensioning device by means of a thread, with the result that a rotation of the roller receptacle about the tube longitudinal axis of the tube end leads to an axial movement of the roller receptacle along the longitudinal axis of the tube. This represents a particularly simple and reliable way to move the roller mount on a screw path around the tube longitudinal axis. It is particularly favorable if at least one of the threaded partners made of hardened steel or another hard material with a

Rockwell hardness of at least 45 HRC, is built up. Thus, the forces occurring during rolling of the thread can be absorbed, without resulting in excessive wear.

According to a preferred embodiment, this includes

Thread rolling tool at least a second profile role, which is fixed to the roller mount, that the second

Roll profile roller upon rotation of the roller receptacle about the pipe longitudinal axis at least partially rolls in rolled by the first profile roll grooves and that it generates at least partially opposed second passive force during operation to a first passive force acting on the first profile role. The second profile role therefore leads to a

lower torque that must be applied to the thread rolling tool to roll the thread.

As an alternative to the second profile roller, it is possible for the thread rolling tool to have a counter element that generates a second passive force that is at least partially opposed to the first passive force. However, this is easy significant frictional force which reduces the achievable quality for the thread and which is necessary for actuation

Torque increased significantly.

The second profile roller is preferably steigungslos. It is advantageous if the profile rollers at least profiled

Section have the same structure. In particular, the

Profile rollers preferably identical. The profile of the second profile roller is offset relative to the profile of the first profile roller with respect to a rotation axis of the first profile roller.

It is convenient, but not necessary, that at least one of the profile rollers is mounted axially displaceable.

Preferably, the first profile roll is one

Erstprofilrollen-Drehachse rotatably mounted and the second profile roller is rotatably mounted about a Zweitprofilrollen rotation axis, wherein the Zweitprofilrollen rotation axis with the

First profile roller axis of rotation forms an angle of 0 ° to 2 °.

According to a preferred embodiment, the first profile roller is rotatably mounted about a Erstprofilrollen rotation axis and a first offset angle between the

Initial profile roller axis of rotation (D14.1) and the longitudinal axis of the tube is at most 2 °, in particular at the highest 1 °. However, the angle is preferably as small as possible in terms of magnitude. The tube longitudinal axis corresponds to the axis of rotation about which the roller ^¬ receptacle is rotatable.

That the offset angle exists means

of course not that intersect the longitudinal axis and the Erstprofilrollen rotation axis. The offset angle is calculated according to the mathematical rules for Angle calculation from the direction vectors of the vectorial representation of rotation axis and longitudinal axis, wherein the

Directional vectors are chosen in particular so that the offset angle is at most 90 °. The offset angle is always given positive, a calculated angle between the axis of rotation and the longitudinal axis of, for example, -0.5 ° is therefore regarded as an offset angle of 0.5 °.

Preferably, the second profile roll is one

Second profile roller rotation axis mounted rotatably and a second offset angle between the second profile roller rotation axis and the tube longitudinal axis is at most 2 °, in particular at most 1 °. Preferably, the thread rolling tool comprises at least a third profile roller which is fixed to the roller receptacle, that the third profile roller upon rotation of the

Roller receptacle about the tube longitudinal axis at least partially rolls in the groove produced by the first profile roller or the second profile roller groove and that in operation a third

Passive force generated, which adds vectorially to zero with the first passive force and the second passive force. In this way, the thread can be produced with a particularly small torque.

It is particularly favorable when the third profile roller is rotatably mounted about a third profile roller rotation axis and the third profile roller rotation axis with the tube longitudinal axis, which corresponds to the axis of rotation of the roller receptacle, a third

Offset angle of at most 2 °, in particular of at most 1 °, forms. According to a preferred embodiment, the

Clamping an actuating sleeve, by means of which the clamping device is tensioned and detachable and located in

Direction of the tube longitudinal axis extends. In particular, the nozzle is provided with a coupling structure, such as an external hexagonal structure or a hexagon socket structure, so that the actuating sleeve with a

complementary tool is actuated.

The invention also solves the problem by a method of making or repairing a conical thread, comprising the steps of (i) attaching a present invention

Thread rolling tool at a pipe end by means of

Clamping device and (ii) rotating the roller mount, wherein the thread moves the roller mount axially along a tube longitudinal axis of the tube end, so that the at least one

Rolling helically around the pipe longitudinal axis and rolling a conical thread into the pipe end or repairing the conical thread.

It is advantageous if the pipe end tapers, in particular conically tapers. However, it is also conceivable that the pipe end is not tapered. It is advantageous that the production of the conical section is eliminated.

The disadvantage is that significantly more material must be formed, which significantly increases the process forces.

According to a preferred embodiment, a thread is rolled over with a thread width which is at most one

Profile roll width corresponds to a profile lateral surface of the profile roll. Show it:

Fig. 1 is a perspective view of a

Thread rolling tool according to the invention,

2 shows a section through the thread rolling tool according to FIG

FIG. 1,

Fig. 3 is a profile role with a conical envelope body and

4 is a second perspective view of

Thread rolling tool.

FIG. 1 shows a thread rolling tool 10 which has a

Clamping device 12 and a first profile roller 14.1, a second profile roller 14.2 and a third profile roller 14.3. The profile rollers 14 (reference numerals without counting suffix refer to all corresponding objects) are mounted on a roller mount 16.

The profile roller 14.1 is rotatably supported about a first-profile roller rotation axis D14.1, the second profile roller 14.2 is rotatable about a second profile roller rotation axis D14.2, the third profile roller 14.3 is rotatable about a third profile roller rotation axis D14.3. The three axes of rotation D14.1, D14.2 and D14.3 form in pairs an angle of at most 2 °,

in particular of at most 1 °.

The clamping device 12 is designed to be fastened to a pipe end 18 and has for this purpose clamping elements 20.1, 20.2, which are movable radially outward via a clamping cone 23. The clamping cone 22 has a not visible in Figure 1 Thread and can be moved relative to the clamping elements 20 by rotating an actuating sleeve 24 in the axial direction with respect to a tube longitudinal axis L. The tensioning device 12 is connected to the roller receptacle 16 via a thread 26. When the tensioning device 12 is fixedly secured to the tube end 18 and the roller seat 16 is rotated about the longitudinal axis L, the profile rollers 14 move on a helical path around the longitudinal axis L.

FIG. 2 shows the thread rolling tool 10 from a section perpendicular to the tube longitudinal axis L.

FIG. 3 shows a detailed view of a profile roller 14. It can be seen that these are present in the present invention

Embodiment conically tapered. This is to be understood that an imaginary enveloping body 28 in the form of a truncated cone can be applied to the profile roller 14 so that it touches it along its lateral surface. The contact points lie on concentric rings, since the profile roller 14 is steigungslos.

FIG. 4 shows the thread rolling tool 10 in a further perspective view. It can be seen that the

Roller receptacle 16 has a coupling structure 30, which is formed in the present case by an external hexagonal structure. The coupling structure 30 is designed for positive engagement with a key of a complementary

Coupling structure.

A method according to the invention is carried out by first of all thread rolling tool 10 at pipe end 18 is attached. For this purpose, the thread rolling tool 10 is introduced with its clamping device 12 in the pipe end 18.

Thereafter, the attachment piece 24 is rotated with a suitable tool, so that the device 12 the

Thread rolling tool 10 attached to the pipe end 18. Thereafter, the roller holder 16 is rotated. This can for example be done by an associated key on the

Coupling structure 30 is applied and rotated. ^{Of course} , it is also possible that a drive,

For example, an electric, pneumatic or

hydraulic drive, is used to rotate the roller mount 16.

In addition, according to the invention, a positioning machine, in particular a machine tool or a robot, which comprises a thread rolling tool according to the invention. The

Positioning machine can be designed for

automatic insertion of the thread rolling tool 10 in a pipe end 18, for tensioning the tensioning device and for rolling the roller receptacle 16. If necessary, has the

positioning machine a tool changer and / or a workpiece changer, so that a plurality of tubes can be machined at their respective tube ends by introducing a tapered thread, in particular a conical thread.

FIG. 1 shows a profile roller width B14 of the profile roller. When the profile roller 14.1 is in contact with the thread just rolled over its full profile roll width B14, the thread has a thread width equal to B14. Reference list

10 thread rolling tool

12 clamping device

14 profile roll

16 roll recording

18 pipe end

20 clamping element

22 clamping cone

24 actuating socket

26 threads

28 enveloping body

30 coupling structure

D14.1 First profile roll rotation axis

D ₁₄ .2 Secondary profile roller axis of rotation

D ₁₄ .3 Third-profile roller axis of rotation

L tube longitudinal axis

Claims

P a n t a n s p r e c h e

Thread rolling tool for rolling and / or repairing a thread, with

a) a tensioning device (12) for attachment to a

Pipe end (18) and

b) at least one profile roller (14.1) for rolling a

Threading in the pipe end (18) or for repairing a thread at the pipe end (18),

characterized in that

c) the at least one profile roller (14.1) is in a

Feed direction of the profile roller (14) tapers, so that a tapered, in particular a conical,

Thread in the pipe end (18) is rollable.

2. Thread rolling tool according to claim 1, characterized

in that the profile roller (14) is stepless. 3. Thread rolling tool according to one of the preceding claims, characterized by

a roll holder (16),

- At which the at least one profile roller (14.1) is attached and

- By means of at least one profile roller (14.1) helically around the pipe end (18) is guided around, that the

at least one profile roller (14.1) threads into the

Pipe end (18) rolls. 4. Thread rolling tool according to one of the preceding claims, characterized in that

the roller receptacle (16) by means of a thread (26) the tensioning device (12) is coupled, so that a rotation of the roller receptacle (16) about a tube longitudinal axis (L) of the tube end (18) to an axial movement of

Roller receptacle (16) along the tube longitudinal axis (L) leads.

Thread rolling tool according to one of the preceding claims, characterized by at least one second profile roller (14.2) which is fastened to the roller receptacle (16) in such a way

- The second profile roller (14.2) upon rotation of the

Roller receptacle (16) about the tube longitudinal axis (L) at least partially rolls in rolled by the first profile roller (14.1) grooves and that

- In operation, one to a first passive force acting on the first profile roller (14.1), at least

partly an opposite second passive force

generated .

Thread rolling tool according to claim 5, characterized

marked that

- the first profiled roll (14.1) about an axis of rotation Erstprofilrollen- (. D ₁₄ ₁₎ is rotatably mounted and a first

Offset angle between the Erstprofilrollen axis of rotation (D _fourteenth ₁₎ and the tube longitudinal axis than 2 °, particularly at most 1 °, and / or

- The second profile roller (14.1) by one

Second profile roller rotation axis (Di ₄ ₂ ) is rotatably mounted and a second offset angle between the

Secondary profile rotary axis of rotation (Di _4, ₂ ) and the longitudinal axis of the tube is not more than 2 °, in particular not more than 1 °.

7. Thread rolling tool according to claim 5 or 6, characterized by at least one third profile roller (14.3), which is fixed to the roller receptacle (16) that

- The third profile roller (14.3) upon rotation of the

Roller receptacle (16) about the tube longitudinal axis (L) at least partially rolls in the of the first profile roller (14.1) and / or the second profile roller (14.2) rolled groove, and that

- It generates a third passive force in operation, which preferably adds vectorially to zero with the first passive force and the second passive force.

8. Thread rolling tool according to claim 7, characterized

marked that

- the third profile roller (14.3) by one

Third-profile roller rotation axis is rotatably mounted and

- the third profile roller (14.3) by one

Third profile roll axis of rotation (Di _4, ₃ ) is rotatably mounted and a third offset angle between the

Third profile roller axis of rotation (Di _4, ₃ ) and the longitudinal axis of the tube is not more than 2 °, in particular not more than 1 °.

9. Method of making or repairing a conical thread, comprising the steps of:

(i) attaching a thread rolling tool (10) according to one of the preceding claims to a pipe end (18) by means of the tensioning device (12) and

(ii) rotating the roller retainer (16), wherein the thread moves the roller retainer (16) axially along a longitudinal tube axis (L) of the tube end (18) such that the at least one profile roller (14) helically extends about the longitudinal axis of the tube (L) moves and a conical thread in the Pipe end (18) rolls.

A method according to claim 9, characterized in that a thread is rolled with a thread width, the maximum of a profile roller width (B i ₄ ) of a

profiled lateral surface of the profile roller (14)

corresponds.