WO2020216455A1

WO2020216455A1 - Shaping method and shaping device

Info

Publication number: WO2020216455A1
Application number: PCT/EP2019/060803
Authority: WO
Inventors: Andreas Gregor Karl BÜLTMANN
Original assignee: Bl Chemie Gmbh & Co. Kg
Priority date: 2019-04-26
Filing date: 2019-04-26
Publication date: 2020-10-29
Also published as: EP3959022A1

Abstract

The invention relates to a shaping method comprising the following steps: - introducing a tube (104) into an opening in a die (101), the opening having at least one region having a smaller circumference than an outer circumference of the tube (104); and then - moving the die (101), the tube (104) being internally hollow during the movement or an inner tool being arranged inside the tube (104) during the movement in the region of the die (101), said tool being removed from the tube (104) after the movement has ended.

Description

Forming process and forming device

The present invention relates to a Umformverfah according to Ren

Claim 1 and a forming device according to Claim 6.

Drawing processes are known from the prior art which are used to reshape a tube or a rod. The tube or rod is drawn through an opening of a drawing die. A circumference of the opening is smaller than an outer circumference of the tube or the rod. As a result of the pulling through the opening, the tube or rod is thus reshaped. In this way, the outer circumference of the tube or the rod is reduced. Depending on

This method can also reduce the wall thickness of the pipe. In contrast, the present invention has the task

based on creating a forming process that works with a

space-saving device can be carried out. In addition, such a shaping device and a system with such a shaping device and a tube are to be created.

This object is achieved by a forming method according to claim 1, a forming device according to claim 6 and a system according to claim 1-7. Embodiments of the invention are specified in the dependent claims.

First, a tube is inserted into an opening in a die. The opening has at least one area with a smaller circumference than an outer circumference of the tube. The die is then moved. During this movement, the pipe is hollow on the inside or an internal tool is arranged in the area of the die, which tool is removed from the pipe after the movement has ended. In particular, the die can be moved over the entire pipe. In particular, it is also possible for the entire pipe to be hollow on the inside. In the context of this description, an internal tool is understood to mean an object that is used for forming purposes during the

Implementation of the forming process is arranged in the tube and then removed from the tube. The interior tool can

for example define an inner circumference of the pipe.

The forming processes occurring on and in the pipe are similar to the forming processes that occur in conventional drawing processes. In contrast to the prior art, however, the die is moved. Therefore, the method can be carried out by a device that is slightly longer than the pipe to be formed. In the prior art, the length of the device is more than twice the length of the pipe, since there must be space for the pipe both in front of and behind the die. Another advantage is that the same tools can be used to insert and remove the pipe from the device. In the prior art, there must be either insert tools and remove tools on each side of the die. Alternatively, the tools can also be moved from one side to the other.

According to one embodiment of the invention, the internal tool can be designed as a rod or a plug. It can be a flying stopper or a stopper with a stopper rod. According to one embodiment of the invention, the tube can be held during the movement at an end that has not yet passed through the die. According to one embodiment of the invention, the held end can be moved during the movement of the die in the same direction in which the die is also moved. In this way, the part of the pipe that has not yet been deformed is kept under tension, as a result of which the force to be exerted by the die for deforming the pipe is reduced. In addition, practical tests have shown that a particularly uniform wall thickness of the pipe can be achieved in this way.

According to one embodiment of the invention, the held end can be moved with a controlled force. Under one

regulated force is in the context of this description

understood in particular that the force exerted on the tube is kept as constant as possible. If the holding means is moved by a torque, the regulated force can be a regulated torque.

The forming device according to claim 6 comprises a drive, a die and an internal tool. The die has an opening through which a tube h can be passed while the

Internal tool within the tube in the area of the die

is arranged. If the internal tool is designed as a rod, the internal tool can also be arranged in the complete tube. The opening has at least one area with a smaller circumference than an outer circumference of the tube. The die can be driven by the drive. As already mentioned above, the advantage of such a forming device is the saving of space. In addition, the pipe can be inserted into the

Device introduced and removed from it.

According to one embodiment of the invention, the inner tool can be designed as a rod or plug.

According to one embodiment of the invention, the

Forming device comprise a holding means which is designed to hold the tube. The die can be designed to be moved by the drive from a first end of the tube to a second end of the tube. The holding means can be designed to hold the tube at the second end while the die is moved from the first end to the second end. According to one embodiment of the invention, the holding means can be designed to be inserted into the pipe and, in the inserted state in the pipe, to grip the pipe and insert it into the opening. The holding means can, for example, as

Internal collet be designed. The “gripping” of the pipe is in particular the formation of a force-fit

Understood connection between the holding means and the tube, which is sufficiently stable to hold the tube during the deformation of the tube in the die or to move. According to one embodiment of the invention, the holding means can be designed to form a non-positive connection with the pipe when it is inserted in the pipe.

According to one embodiment of the invention, the non-positive connection can be so stable that it remains in place when the die is moved with the tube passed through the die. In particular, it is also possible for the tube to move during the movement of the die using the holding means can be . For example, the holding means can be used to keep the undeformed end of the tube under tension during the forming process. According to one embodiment of the invention, the holding means can be designed to be moved away from the first end during the movement of the die. So the pipe can during the

Deformation can be kept on tension, which reduces the force that has to be exerted by the die to deform the tube. In addition, practical tests have shown that a particularly uniform wall thickness of the pipe can be achieved in this way.

According to one embodiment of the invention, the

Forming device comprise a force regulating means which regulates a force exerted on the holding means. As already mentioned in relation to the method, the regulated force can also be designed as a regulated torque. The force control means can

in particular be designed to keep the force exerted on the tube as constant as possible. That way becomes a

particularly uniform deformation achieved.

According to one embodiment of the invention, the drive can be designed to drive the holding means. Both the die and the holding means are then driven by the same drive

driven.

According to one embodiment of the invention, the

Forming device comprise a holding means drive which is designed to move the holding means. This is particularly advantageous since the force available to drive the holding means is independent of the force transmitted to the die. According to one embodiment of the invention, an angle at which the tube can be inserted into the opening can be adjustable. This angle can also be referred to as the inlet angle. For this purpose, the orientation of the die can be adjustable.

For example, the orientation of the die can be adjusted relative to a geometric axis along which

unadjusted die extends the tube. Adjusting the inlet angle can be advantageous in order to reduce an eccentricity of the formed tube. In the context of this description, the term eccentricity is used

understood in particular an unevenness of the pipe wall. The eccentricity can be reduced, for example, by using a measuring device for measuring the eccentricity in order to measure the eccentricity of the pipe before forming. The

The measurement result can be used to change the inlet angle and thus reduce the eccentricity.

Further features and advantages of the present invention will become more preferred with reference to the description below

Embodiments with reference to the enclosed

Illustrations. The same are used for the same and similar components and for components with the same or similar functions

Reference signs used. Show in it:

1 shows a schematic plan view of a device according to an embodiment of the invention, in which the pipe is not held under tension;

2 shows a schematic plan view of a device according to an embodiment of the invention, in which the pipe is held under tension; and

3 shows a schematic plan view of a device according to an embodiment of the invention with guidance of the die on both sides and force means in the middle. The forming device in FIG. 1 comprises a guide 100, a

Die 101, a drive 102 and a support means 103. The die 101 can be moved by the drive 102. During this movement, it is guided by the guide 100. A tube 104 protrudes through an opening in the die 101. The circumference of the opening is smaller than the outer circumference of the tube 104, at least in a partial area. The tube 104 is inserted at one end through the

Support means 103 held.

In operation, the die 101 is moved from the end of the tube 104 held by the support means 103 in the direction of the loose end of the tube 104. Due to the smaller circumference of the opening, the tube 104 is deformed. If the die 101 was moved completely over the pipe 104, the complete pipe 104 was reshaped.

During the forming process, a

Inner tooling such as a plug or a rod can be arranged to an inner diameter of the pipe

define.

The device in Figure 2 works in principle similar to that

Device according to Figure 1. It differs from this

in particular by holding ittel 200, which the

Support means 103 holding opposite end of the tube 104. During the deformation, the holding means 200 with the end of the tube 104 held therein can be moved in the same direction as the die 101, so that the tube 104 is kept under tension in the area not yet deformed, whereby the

Forming simplified and a particularly uniform wall thickness of the formed tube 104 is achieved. The movement of the

Holding means 200 preferably takes place via a torque control, as a result of which a force exerted particularly uniformly on the pipe 104 can be achieved. The holding means 200 can preferably be designed as internal collets.

The device in Figure 3 works in principle similar to that

Devices according to FIG. 1. However, the die 101 is not guided by a guide on one side, but by a guide 300 on both sides. This increases the stability of the device. The die 101 can be moved by a force means.

Claims

Patent claims:

1. Forming process, comprising the following steps:

Introducing a tube (104) into an opening of a die (101), the opening having at least one region with a smaller circumference than an outer circumference of the tube

(104); and then

Movement of the die (101), the tube (104) being hollow on the inside during the movement or wherein an inner tool is arranged inside the tube (104) during the movement in the region of the die (101), which after the end of the

Movement is taken from the tube (104).

2. The method according to claim 1, characterized in that the inner tool is designed as a rod or plug.

3. The method according to any one of the preceding claims, characterized

characterized in that the tube (104) is held during the movement at an end not yet guided through the die (101).

4. The method according to the preceding claim, characterized

characterized in that the pinned end is moved in the same direction as the die (101) during movement of the die (101).

5. The method according to the preceding claim, characterized

characterized in that the held end is moved with a controlled force.

6. Forming device comprising a drive (102), a

Die (101) and an inner tool, the die (101) having an opening through which a tube (104) can be passed while the inner tool is arranged inside the tube (104) in the area of the die (101), the opening having at least one area with a smaller circumference than an outer circumference of the tube (104), characterized in that the die (101) can be driven by the drive (102).

7. Forming device according to the preceding claim, characterized

characterized in that the inner tool is designed as a rod or plug.

8. Forming device according to one of the previous two

Claims, characterized in that the

Forming device comprises a holding means (200) which is used for

Holding the tube (104) is formed, wherein the die

(101) is designed to move from a first end of the tube (104) to a second end of the tube (104) by the drive

(102) to be moved, and wherein the holding means (200) is designed to hold the tube (104) at the second end while the die (101) is moved from the first end to the second end.

Forming device according to the preceding claim, characterized in that the holding means (200) is designed to be inserted into the tube (104) and, when inserted in the tube (104), to grip the tube (104) and insert it into the opening.

Forming device according to the preceding claim, characterized in that the holding means (200) is designed to form a non-positive connection with the tube (104) when it is inserted in the tube (104).

11. Forming device according to the preceding claim, characterized

marked that the frictional connection is so stable is that it remains with a movement of the die (101) with the tube (104) passed through the die (101).

12. Forming device according to the preceding claim, characterized in that the holding means (200) is designed to be moved away from the first end during the movement of the die (101).

13. Forming device according to the preceding claim, characterized in that the forming device is a

Force regulating means which regulates a force exerted on the holding means (200).

14. Forming device according to one of claims 6 to 13, characterized in that the drive (102) is designed to move the holding means (200). 15. Forming device according to one of claims 6 to 13, characterized in that the forming device has a

Includes holding means drive, which is designed to

To move holding means (200).

16. Forming device according to one of claims 6 to 15, characterized in that an angle at which the tube (104) can be guided into the opening is adjustable.

17. A system comprising a forming device according to any one of claims 6 to 16 and the tube.