DE202022105367U1 - Device for forming a workpiece - Google Patents

Abstract

Device (10) for forming a workpiece, such that the workpiece is plastically deformed, comprising:
- A movably mounted head part (20) with a processing head (30);
- An axial lifting unit (21) designed to bring about an axial lifting movement along the longitudinal axis of the head part (20);
- A radial lifting unit (22) designed to convert the axial lifting movement into a radial lifting movement of the machining head (30);
- A drive (40), wherein the drive (40) is electrically driven; and
- a housing (50) for accommodating the head part (20), the lifting units (21, 22) and the drive (40), characterized in that the device (10) is coaxial with the axis of rotation of an output (111) of a machine tool (100 ), and is operatively vervindbar connected longitudinally to the machine tool (100), and is designed for radial deformation of the workpiece.

Description

field of technology

The invention relates to a device for forming a workpiece in such a way that the workpiece is plastically deformed. It further relates to a machine tool with a coupling mechanism for such a device, all according to the preambles of the independent patent claims.

Technological background

Forming machines and tools for linear -, in the following also axial - and radial forming are known from the prior art. Forming tools for forming workpieces by combined axial and radial movement of a burnishing tool have recently become known. However, existing solutions are mostly based on purely mechanical solutions in order to adjust roller burnishing tools in the radial direction, starting from an axial movement. In order to adjust the mechanics, mechanical end stops must then be adjusted, among other things. In some applications, the workpiece itself is used as a stop.

Known radial burnishing tools also offer only very limited process data acquisition. The feedback is often limited to reaching the end stop, which, however, only provides very limited conclusions about correct rolling.

A burnishing tool is known from DE 10 2018 117 739 A1 The invention relates to a burnishing tool for machining a surface of a bore, comprising a rolling element running conically along a tool axis and at least one roller movably resting on the rolling element. It is proposed to arrange a restoring means on the roller, which acts on the roller with a force directed radially inward with respect to the rolling element. The rolling element is acted upon radially by a mechanical restoring means, in particular a spring.

U.S. 2020/0262026 B1 discloses a roller burnishing tool with a base body extending along a central longitudinal axis, at least one roller holder which is radially adjustable on the base body and which holds a roller burnishing roller in a rotatable manner, and an adjusting device which is arranged in the base body and which interacts with the roller holder to adjust the roller holder in the radial direction. The roller holder has a holder arm that holds the burnishing roller and can be deflected in a radial direction by the adjusting device so that it can pivot in relation to the base body. Due to the structure of this burnishing tool, it can only be used in a limited number of application examples. In addition, this roller burnishing tool only allows limited process data acquisition.

WO 2015/185363 A1 relates to a device for making a bead-shaped depression in a wall area of a pipe. In particular, the device comprises a drive shaft for rotating a tool head, on which a support roller and a freely rotatably mounted internal burnishing mandrel are held. A cup-shaped guide head with a sleeve-shaped wall is provided concentrically to the drive shaft. In order to make it possible to produce the indentations from the inside of the tube as well, a first conical guide surface is provided on the inside of the sleeve-shaped wall in a first circumferential angular range, along which the holding device slides, as a result of which the inner burnishing mandrel can be displaced radially in order to achieve the desired bead-like indentation embossed in the wall of the pipe. The profiling of the inner roller mandrel is done with a complementary profile to the outside of the roller. Therefore, such a device has at least some of the already mentioned disadvantages of the prior art.

There is therefore a need for solutions which counteract the disadvantages of the prior art mentioned above. In particular, there is a need for roller burnishing tools that enable fully electrical control of the axes and, at the same time, reliable process data acquisition.

There is a general need for improvement in this area.

object of the invention

The object of the invention is to provide a device for forming a workpiece of the type mentioned at the outset, which overcomes at least one known disadvantage. In particular, such a device should enable a workpiece to be deformed in the radial direction. A machine tool according to the invention can, for example, enable a workpiece to be deformed in two axes at the same time. A further advantage of the device according to the invention lies in the fact that it can be controlled completely servo-electrically and offers full process data acquisition through force-displacement acquisition and an integrated evaluation of the process data.

Another object of the invention is to provide a device which with a Machine tool, advantageously according to a cold forming machine CH 3822016 A of the applicant, is releasably connectable and able to cooperate coaxially with it.

At least one of these objects is solved by the device according to the invention according to the characterizing part of the independent claims. Further advantageous embodiments are given in the dependent claims.

The solution according to the invention can be further improved by various configurations that are advantageous in and of themselves and, unless stated otherwise, can be combined with one another as desired. These embodiments and the advantages associated with them are discussed below.

Presentation of the invention

One aspect of the present invention relates to a device for forming a workpiece in such a way that the workpiece is plastically deformed.

The device comprises a movably mounted head part with a processing head, an axial lifting unit designed to bring about an axial lifting movement along the longitudinal axis of the head part, and a radial lifting unit which is designed to convert the axial lifting movement of the axial lifting unit into a radial lifting movement of the processing head . The device according to the invention also comprises a drive, the drive being electrically driven, and a housing for accommodating the head part, the lifting units and the drive.

The device is further characterized in that it is coaxially connected to the axis of rotation of an output of a machine tool and is operatively connected longitudinally to the machine tool, and is designed for radial deformation of the workpiece.

In a particularly preferred embodiment of the invention, the machine tool is designed as a cold forming machine CH 3822016 A trained by the applicant. This cold forming machine is controlled servo-electrically and brings about an axial stroke with simultaneous rotation about the longitudinal axis, which is generated by a rotary drive and can be transmitted to the integrated device according to the invention. Together, a device according to the invention and a cold forming machine according to CH 3822016 A a deformation of a workpiece in rotary, axial and radial directions at the same time.

The drive advantageously includes a hollow shaft motor, so that a rotary movement can take place through the hollow shaft motor. The device also includes a screw drive, selected from the group consisting of: roller drive, ball drive or planetary screw drive.

Furthermore, the drive of the device is controlled servo-electrically in a preferred embodiment. However, the adjustment of the drive of the device is mechanically decoupled from the drives of a machine tool according to the invention, so that deformations are freely programmable, i.e. the infeed axes of the device can be controlled independently of one another in combination with the machine tool.

The radial and axial lifting units according to the invention comprise interacting pressure elements, in particular the axial lifting unit comprises at least one pressure surface and the radial lifting unit at least one pressure-receiving surface. In a particularly preferred embodiment, the axial lifting unit comprises a pressure surface and a pressure piece, the pressure surface, which is connected to the threaded drive, undergoing an axial lifting movement and the pressure piece undergoing an axial lifting movement and rotation about the longitudinal axis of the device. In this case, the radial lifting unit comprises at least one pressure-receiving surface, which converts the axial feed of the axial lifting unit into a radial feed. The pressure elements advantageously have complementary, conically tapering surfaces, so that the pressure surface of the axial lifting unit slides along the pressure-receiving surface of the radial lifting unit when it makes contact. In contrast to the existing solutions from the prior art, the present invention does not require any complex resetting means. The geometry of the interacting pressure elements favors easy insertion and resetting of the processing head. In a possible preferred embodiment, the interacting pressure elements or lifting units form a T-groove geometry with a plurality of contact surfaces that rest against one another.

In a special embodiment, the processing head is designed as a roller burnishing tool, in particular as a roller burnishing head with profile rollers. In a further preferred embodiment, the burnishing head is equipped with three rollers, in a particularly preferred embodiment, the processing head is designed in one piece with the radial lifting unit, i.e. rigidly connected to one another, and designed so that it can be releasably connected to the device. This design allows for easy replacement of the roller burnishing tools.

The device includes a force sensor which measures the contact pressure of the processing head. The force sensor can also be designed in such a way that it detects feedback, ie a resistance of the processing head. In a special embodiment, the force sensor is a piezo force sensor. Alternatively, an expansion or torsion cylinder or a spring can also be used to measure the corresponding contact pressure. The force sensor transmits process data to the integrated controller of a machine tool according to the invention.

In a special embodiment, the device also includes at least one sensor for detecting a workpiece. In an alternative embodiment, the device according to the invention comprises at least one touch sensor for detecting a workpiece. This touch sensor can, for example, as in the WO 2005/007319 A1 designed by the applicant. In yet another particular embodiment, the touch sensor includes a capacitive sensor. The use of a force sensor for detecting a workpiece is also conceivable. By using a strain gauge or a piezo sensor, additional information about the applied forces can be obtained.

In a special embodiment, the housing according to the invention is designed in two parts, the housing units being designed such that they can be connected to one another in a detachable manner. The first housing unit advantageously houses the drive and the second housing unit houses a bearing system for the head part and the machining head. It is also provided in an alternative embodiment that the housing is designed in several parts and enables the person skilled in the art to have a modular arrangement that is suitable for him. Furthermore, in a particularly advantageous embodiment, the housing is laterally fixed.

In a preferred embodiment, the bearing system is an axial-radial bearing, which is connected downstream of the drive. In a further possible embodiment, the bearing system comprises at least one further bearing, which is connected upstream of the drive, for example, but not limited to, a further axial-radial bearing, rotary bearing, sliding bearing, roller bearing and/or thrust bearing.

The drive can also be designed to be exchangeable independently of the housing parts. For the purposes of the present invention, an arrangement of the device can be defined as coaxial with the machine tool if they have at least one matching axis of rotation. In the present example, the longitudinal axis of the device is therefore also the axis of rotation of the first drive and the second drive of the machine tool.

Another aspect of the present invention relates to a machine tool, comprising a device according to the invention and a coupling mechanism that can be detachably connected to the device for coupling the device to the machine tool. As already mentioned above, the machine tool according to the invention is preferably used as a cold forming machine according to CH 3822016 A trained by the applicant. The device according to the invention can be connected and operationally coupled to such a cold forming machine by means of an output drive or a coupling mechanism. Such a coupling mechanism can be implemented in the form of an output, a connecting pin, a fastening unit, a snap-in element or any other suitable solution known to those skilled in the art.

Further aspects of the present invention also result from the following description.

character list

For a better understanding of the present invention, reference is made to the drawings below. These only show exemplary embodiments of the subject matter of the invention.

The examples given below are given to better illustrate the present invention, but are not intended to limit the invention to the features disclosed herein.

• 1 zeigt schematisch einen Längsquerschnitt einer möglichen Ausführungsform einer erfindungsgemässen Vorrichtung,
• 2 zeigt schematisch einen Längsquerschnitt einer möglichen Ausführungsform einer erfindungsgemässen Werkzeugmaschine, einschliesslich einer erfindungsgemässen Vorrichtung,
• 3 zeigt schematisch einen Längsquerschnitt einer möglichen Ausführungsform einer erfindungsgemässen Vorrichtung in einer explodierten Ansicht,
• 4a zeigt schematisch einen Längsquerschnitt einer möglichen Ausführungsform eines erfindungsgemässen Kopfteils,
• 4b zeigt schematisch einen Längsquerschnitt der 4a mit ausgefahrenem axialen und radialen Hub, und
• 5 zeigt schematisch eine mögliche Ausführungsform einer erfindungsgemässen Vorrichtung in einer Aussenansicht.

The same or similar reference symbols are used in the following figures and the associated description for parts that are the same or have the same effect.

• 1 shows schematically a longitudinal cross section of a possible embodiment of a device according to the invention,
• 2 shows schematically a longitudinal cross section of a possible embodiment of a machine tool according to the invention, including a device according to the invention,
• 3 shows schematically a longitudinal cross section of a possible embodiment of a device according to the invention in an exploded view,
• 4a shows schematically a longitudinal cross section of a possible embodiment of a head part according to the invention,
• 4b shows schematically a longitudinal cross section of 4a with extended axial and radial stroke, and
• 5 shows schematically a possible embodiment of a device according to the invention in an external view.

implementation of the invention

The present invention is not limited in scope to the specific embodiments described herein. Rather, for the person skilled in the art, from the description and the associated figures, various further modifications of the present invention, which also fall within the scope of protection of the claims, result in addition to the examples disclosed here. In addition, various references are cited in the description, the disclosure content of which is hereby incorporated in its entirety by reference into the description.

1 until 5 show schematically a preferred embodiment of a device 10 according to the invention. The head part 20 of the device 10 comprises a processing head 30 which is designed as a burnishing head 31 with rollers 32 in the embodiment shown. The drive 40 is designed as a hollow-shaft servomotor 41 according to FIG CH 3822016 A realized by the applicant, wherein a screw drive 42 is arranged in the cavity and a rotational movement about the axis of rotation R through the hollow shaft servomotor 41 takes place. In the embodiments shown, the drive comprises a threaded drive 42 comprising a threaded spindle and a threaded nut. The screw drive 42 causes an axial feed of the axial lifting unit 21, the axial lifting unit 21 being operatively connected to the threaded spindle of the screw drive 42. This in 3 , 4a and 4b shown pressure piece 24 of the axial lifting unit 21 contacts and slides during an axial feed along a conical pressure-receiving surface 25 of the radial lifting unit 22, so that the axial feed is converted into a radial feed and the rollers 32 of the burnishing head 31 contact or form a workpiece. In a special embodiment, a rotation of the pressure surface 23 of the axial lifting unit 21 is prevented, but a rotation of the pressure piece 24 and the pressure receiving surface 25 is possible. In addition, in a preferred embodiment, the housing 50, the drive 40, the rotary bearing 61 and the radial lifting unit 22 are laterally fixed.

3 shows the device 10 according to the invention in an exploded view. In one possible embodiment, the housing 50 is designed in two parts. The first housing unit 51 accommodates the machining head including lifting units and the second housing unit accommodates the drive, the rotary bearing and a receiving section 70 for receiving in a machine tool 100 according to the invention.

The functional principle of the lifting units 21, 22 is in 4a and 4b illustrated. 4b shows the device according to the invention 4a with the hub extended. The conically tapering pressure surface of the pressure piece 24 slides along the complementary, conically tapering pressure-receiving surface 25 during an axial advance, so that the radial lifting unit 22, and thus the burnishing head 31, is moved inwards. Analogously, in the case of an axial return, the radial lifting unit 22 is geometrically forced outwards. In this case, the resetting takes place solely by actuating the drive 40.

The examples of 1 , 2 and 5 , also show a machine tool 100 according to the invention, to which the device 10 according to the invention is detachably connected. In the 2 shown machine tool 100 according to the invention is off CH 3822016 A known, wherein the machine tool 100 comprises a first drive 121, a second drive 122 and a coupling mechanism in the form of a connecting pin 111 for a device 10 according to the invention. As in 2 As can be seen, the drives of the machine tool 100 and the drive of the device 10 are arranged coaxially. Nevertheless, the drive 40 of the device 10 is mechanically completely decoupled from the drives 121, 122 and can be independently numerically controlled. The second drive 122 of the machine tool 100 is advantageously a rotary drive, with the rotation of the machine tool taking place through the hollow-shaft servo motor 41 of the device 10 . A machine tool 100 according to the invention, together with the device 10, is thus able to rotary, axially and radially deform a workpiece.

Ultimately is in 5 a device 10 according to the invention, which is detachably connected to a machine tool 100 according to the invention, is shown in an external view. The modular design is particularly space-saving and optimized. The device 10 according to the invention can thus considerably expand the applications of a machine tool and enable forming in two axes at the same time. In addition, the maintenance of such a machine tool is simple and the individual components can be easily replaced. in the in 5 embodiment shown is the on receiving section 70 of the device 10 is enclosed by the machine tool 100 and secured by the coupling mechanism 110 and operatively connected to the machine tool 100 .

reference list

10

contraption

20

headboard

21

axial lifting unit

22

radial lifting unit

23

printing surface

24

Pressure piece

25

pressure receiving surface

30

processing head

31

roller head

32

rolls, rollers

40

drive

41

hollow shaft motor, hollow shaft servo motor

42

screw drive

50

Housing

51

first housing unit

52

second housing unit

60

storage system

61

rotary bearing

70

recording section

80

sensor

100

machine tool

110

coupling mechanism

111

Connecting pin, output

121

first drive of the machine tool

122

second drive of the machine tool

R

axis of rotation

X

transverse axis

Y

longitudinal axis

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 102018117739 A1 [0004]
• US 2020/0262026 B1 [0005]
• WO 2015/185363 A1 [0006]
• CH 3822016 A [0010, 0016, 0026, 0032, 0035]
• WO 2005/007319 A1

Claims (11)

Device (10) for forming a workpiece, such that the workpiece is plastically deformed, comprising: - a movably mounted head part (20) with a machining head (30); - An axial lifting unit (21) designed to bring about an axial lifting movement along the longitudinal axis of the head part (20); - A radial lifting unit (22) designed to convert the axial lifting movement into a radial lifting movement of the machining head (30); - A drive (40), wherein the drive (40) is electrically driven; and - a housing (50) for accommodating the head part (20), the lifting units (21, 22) and the drive (40), characterized in that the device (10) is coaxial with the axis of rotation of an output (111) of a machine tool ( 100), and longitudinally operatively vervindbar connected to the machine tool (100), and is designed for radial deformation of the workpiece. Device (10) after claim 1 , characterized in that the drive (40) is servo-electrically controlled and mechanically decoupled from drives (121, 122) of the machine tool (100) in such a way that the infeed axes can be controlled independently of one another. Device (10) after claim 2 , characterized in that the drive (40) further comprises: a) a hollow shaft motor (41), so that a rotational movement about the longitudinal axis of the device (10) through the hollow shaft motor (41) can take place, and b) a screw drive ( 42) selected from the group consisting of: roller drive, ball drive or planetary screw drive. Device (10) according to one of Claims 1 until 3 , characterized in that the radial lifting unit (22) and the processing head (20) are formed in one piece and are designed to be releasably connectable to the device (10). Device (10) according to one of Claims 1 until 4 , characterized in that the radial lifting unit (22) and the axial lifting unit (21) comprise interacting pressure elements, in particular the axial lifting unit (21) comprises at least one pressure surface (23) and the radial lifting unit (21) at least one pressure receiving surface (25). Device (10) according to one of Claims 1 until 5 , characterized in that the processing head (30) is designed as a burnishing tool, in particular as a burnishing head with profile rollers (31). Device (10) according to one of Claims 1 until 6 , characterized in that the device (10) comprises a force sensor which measures the contact pressure of the processing head part (30). Device (10) according to one of Claims 1 until 7 , Further comprising at least one sensor (80) for detecting a workpiece. Device (10) according to one of Claims 1 until 8th , characterized in that the housing (50) comprises at least a first housing unit (3) and a second housing unit (4), and the housing units (3, 4) are designed to be detachably connected to one another. Device (10) according to claim 9 , characterized in that the first housing unit (51) accommodates the drive (40) and the second housing unit (52) accommodates a bearing system (60) and the machining head (30). Machine tool (100) comprising a device (10) according to one of Claims 1 until 10 and a coupling mechanism (110) releasably connectable to the device (10) for coupling the device (10) to the machine tool.

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