Tool

Abstract

The invention relates to a tool for producing groove-shaped depressions (14), in particular beads, in hollow cylindrical workpieces (10) using a roll-forming method, comprising a main part (16) and profiled rollers (18) that are arranged thereon, delimit a shaping chamber (20) in which the workpiece (10) can be received, and are guided in the main part (16) so as to be retractable and extensible into / out of the shaping chamber (20) using an adjustment device (24). The invention is characterized in that, by virtue of an additional adjustment device (26) which at least partly engages through the main part (16), a workpiece receiving area (28) for the workpiece (10) can be moved longitudinally in the direction of the shaping chamber (20) and in the opposite direction.

Description

[0001] Tool

[0002] The invention relates to a tool for producing groove-shaped depressions, in particular beads, in hollow cylindrical workpieces using a roll forming process, with a base body and profile rollers arranged thereon, which delimit a forming space in which the workpiece can be received and which are guided in the base body by means of an adjusting device so as to be retractable and extendable into the forming space.

[0003] EP 3 151 986 B 1 discloses a device for introducing a bead-like indentation into a wall region of a pipe as the workpiece, comprising: a clamping device for clamping the pipe in a rotationally fixed manner such that the wall region of the pipe is freely accessible; a rotatably mounted drive shaft with an end facing the clamping device, wherein the drive shaft is aligned such that its axis of rotation is aligned with the longitudinal axis of the clamped pipe; a first drive device for rotating the drive shaft; a cup-shaped guide head with a sleeve-shaped wall, wherein the guide head is mounted concentrically to and rotationally fixed on the drive shaft and is open towards the clamping device; a tool head rotatably mounted on the end of the drive shaft facing the clamping device;a support roller holding device with a freely rotatable support roller with a profile on its circumference, which is designed to complement the desired indentation, for rolling on the outside of the wall area of ​​the pipe; and a freely rotatably mounted internal rolling mandrel for insertion into the end face of the pipe.

[0004] In this way, a device for introducing a bead-like indentation into the wall area of ​​a pipe is known, wherein the production of the indentations is possible from the interior of the pipe and is supported accordingly from there.

[0005] EP 1 984 131 B1 discloses a tool for producing cylindrical workpieces using a roll forming process, comprising concentrically arranged profile rollers, by means of which a profile is created on the circumference of a workpiece. Above at least one rolling unit consisting of concentrically arranged profile rollers, there is a drawing unit, within which a blank is drawn over a drawing ring by means of a punch upper part. In this way, a blank as a workpiece, which serves as the starting shape for the roll forming process, can be produced from a flat blank by means of a forming process that precedes the roll forming process. Both the forming process and the roll forming process are carried out under the same ram during the same ram downward stroke of the manufacturing machine.

[0006] Based on this prior art, the invention is based on the object of further developing the known solutions to obtain improved groove-shaped depressions, in particular beads, in hollow cylindrical workpieces. This object is achieved by a tool having the features of patent claim 1 and a method having the features of patent claim 10.

[0007] Because, according to the characterizing part of patent claim 1, a workpiece holder for the workpiece can be moved longitudinally in the direction of the forming space and in the opposite direction by means of a further adjusting device which at least partially passes through the base body, improved groove-shaped depressions, in particular beads, are obtained in hollow cylindrical workpieces using a roll forming process.

[0008] When forming a constriction in the form of a groove-like depression or bead, the workpiece material is deflected several times and additional material in the form of material for forming the constriction is not available, so that a so-called ironing of the material occurs during forming. In this respect, the material length required to maintain the constriction must be obtained from the reduction in wall thickness, which in turn leads to a reduction in component strength. To avoid this undesirable effect, the solution according to the invention feeds or pushes in the material required for forming the bead axially from at least one side of the tool, as long as it is needed to form the constriction and maintain the required geometry.

[0009] The method according to the invention according to the applicable patent claim 10 with preferred use of a tool as stated above provides that during the introduction of the groove or bead into the workpiece, an axial feed movement is carried out on the workpiece as a whole by means of the profile rollers by means of an adjusting device in such a way that adjacent wall material visibly flows into the bead course, so that sufficient material is available for the bead formation.

[0010] In a preferred embodiment of the tool according to the invention, the adjustment device for each profile roller comprises a roller carrier which, controlled by an inclined plane, can be moved in the radial direction transverse to the rotational axis of the base body and thus moves into and out of the forming chamber. The conversion of an axial movement into a radial movement of the roller carriers can be achieved by means of the aforementioned inclined plane within the framework of a wedge mechanism. As an alternative to the wedge mechanism, a link mechanism or a toggle lever mechanism can be provided, as well as a flat spiral. Hydraulic or electromechanical actuation of the roller carriers in the base body of the tool is also possible. The actuation kinematics for the axial movement are achieved by suitable elements of the manufacturing machine, such as linear drives, spindle drives, or working cylinders.Axial travel to a stationary stop in the machine is also conceivable. In this case, the closing movement of the profile rollers and the axial positioning of the tool head are mechanically coupled.

[0011] In this respect, within the framework of the wedge mechanism, the respective inclined plane is preferably part of a guide body which is guided by means of a drive so as to be movable parallel to the axis of rotation of the base body.

[0012] In a preferred embodiment of the tool according to the invention, the drive comprises a hollow cylindrical shaft, at one end of which the guide bodies are arranged, and at the other end of which an infeed device engages as part of the drive, by means of which the shaft is guided axially to the rotational axis of the base body. Thus, by means of the infeed device, the profile rollers can be continuously positioned one on top of the other. During the infeed movement, the profile rollers reduce the free diameter of the forming space and thus continuously introduce the bead pattern into the hollow cylindrical workpiece.

[0013] In a further preferred embodiment of the tool according to the invention, it is provided that a further drive engages the outer circumference of the base body, by means of which the base body, together with the guide bodies and the profile rollers, can be rotated about its axis of rotation. The rotational drive of the tool or the tool head can be offset laterally and, for example, via a belt drive or gear drive. In this case, the bearings of the tool head with the guide bodies and the profile rollers are preferably carried by means of rolling bearings attached to the base body, which can be assigned to the manufacturing machine. The drive and bearing of the tool can, however, also be implemented in a machine-side spindle with a defined interface to the tool head; in this case, the rolling bearings and the drive element on the tool head are then omitted.

[0014] In a further preferred embodiment of the tool according to the invention, the respective profile roller is rotatably guided on its associated guide body and with a rotation axis parallel to the rotation axis of the base body. In this way, high forming forces can be exerted on the hollow cylindrical workpiece via the respective profile roller during the bead forming process. To this end, the respective profile roller preferably has a protruding, circumferential shaped part on its outer circumference, the shape of which is adapted to the annular recess or bead to be created in the workpiece.

[0015] In a particularly preferred embodiment of the inventive

[0016] The tool is designed so that for securing the workpiece to be machined in the forming space, the further setting device has a holder which preferably holds a free edge region of the hollow cylinder in question. For this purpose, a hold-down device which is independent of the tool movement both axially and rotationally is used centrally in the tool as a workpiece holder. The hold-down device or holder is moved actively by the manufacturing machine in a synchronized manner with the bead forming process so that the required material can flow in at the desired rate. During this adjustment, axial forces are regularly generated which are likely to cause permanent, undesirable deformations, particularly in the upper, open region of the hollow cylindrical workpiece. The shape of the holder is therefore designed in such a way that the open, fundamentally very unstable edge of the hollow cylindrical workpiece is enclosed, supported and thus stabilized.In this way, undesirable deformations such as bulging or ovality are reduced.

[0017] Cup-shaped, thin-walled containers (cans) made of metallic materials are regularly used in large quantities as hollow cylindrical workpieces that require beading, as is required for the production of cylindrical battery cells. It has proven particularly advantageous if the additional adjustment device with the holder has a rotationally fixed axis that extends concentrically to the rotational axis of the base body through the drive shaft and, in addition to the holder, has an engagement point for an additional feed device, by means of which the additional adjustment device can be axially extended and retracted into the forming space. Overall, the tool as a whole results in a particularly compact design.

[0018] The tool according to the invention and the manufacturing method are explained in more detail below with reference to the drawings. Figure 1 shows the essential components of the tool in a schematic representation, not to scale, in the form of a partial sectional view;

[0019] Figure 2 shows a longitudinal section through the forming tool according to Figure 1 with drives indicated;

[0020] Figure 3 is a plan view of the tool according to Figure 2 in the direction of the arrow;

[0021] Figures 4 and 5 show a front section of the representation according to Figure 2;

[0022] Figures 6 and 7 are enlarged detailed views of Figures 4 and 5; and

[0023] Figure 8 shows an external view of the hollow cylindrical workpiece, once undeformed according to the left image and once according to the right image with a groove-shaped depression or bead introduced.

[0024] For the production of cylindrical battery cells, e.g. for applications in e-mobility, cup-shaped, thin-walled containers, technically referred to as cans, made of metallic materials, usually nickel-plated steel, are required in large quantities. The wall thicknesses of such hollow cylindrical, cup- or pot-like workpieces are in a range from 0.2 mm to 1 mm, and a typical diameter range is between 20 mm and 60 mm. Such a cup-like container 10, which will be referred to below as a hollow cylindrical workpiece 10, is shown undeformed in the left-hand half of the image as viewed in the direction of Figure 8. A circumferential, groove-shaped depression 14 or bead is to be introduced into the upper end region of the hollow cylindrical shell 12 of the cup, whereby the corresponding material constriction should be circumferential with a width between 0.4 and 1.5 mm and a depth of 1 to 3 mm.This constriction or depression 14 serves as a support and reference surface for subsequent seals and a closure cover (not shown) in the further manufacturing process during the completion of the battery cell. The wall thickness of the workpiece 10 may only be reduced very slightly in the area of ​​the constriction or depression 14, by a maximum of 20%, which in this case corresponds to a value of approximately 0.06 mm. In this way, the load-bearing capacity of the workpiece 10 is fully retained despite the circumferential wall depression. The cylindrical shape, including the roundness, of the workpiece 10 should be retained within a range of approximately 0.08 mm in order to ensure the function of the subsequent components during assembly to form the battery cell. The term "hollow-cylindrical" includes "hollow cylindrical" as well as "cup-shaped" or "pot-shaped" components.

[0025] As can be further seen from Figure 8, the container 10, according to its left initial state, is dimensioned larger in its axial length than the right container 10 with the circumferential groove-shaped depression 14. In this way, the wall material in the region of the depression 14 has preferably been adjusted during the bead formation, which will be explained in more detail below.

[0026] The perspective view in Figure 1 shows the essential components of a tool required to produce groove-shaped depressions 14 as shown in the right-hand image in Figure 8. This tool is particularly suitable for carrying out a so-called roll forming process on workpieces 10 of the type mentioned. In particular, the tool in Figure 1 has a single-part or multi-part base body 16 with profile rollers 18 arranged thereon, which together define a central forming space 20 into which the workpiece 10 can be received, as can be seen in more detail in the view in Figure 2. In the present case, three profile rollers 18 are used, which are grouped radially at an equidistant distance from one another and diametrically opposite one another around a rotation axis 22 of the tool.It is understood that a different suitable number of profile rollers, in particular 2 to 5 profile rollers 18, can also be used for the tool.

[0027] By means of an adjustment device, designated as a whole by 24, the individual profile rollers 18 can be moved in and out of the central, cylindrical shaping chamber 20. The adjustment device 24 and its components are at least partially guided within the base body 16 of the tool. By means of a further adjustment device, designated as a whole by 26 and which at least partially extends through the center of the base body 16, a workpiece holder 26 can be moved longitudinally toward the shaping chamber 20 and in the opposite direction, as well as within the shaping chamber 20.

[0028] The adjustment device 24 has a cuboid roller carrier 30 for each profile roller 18, which is movable in the radial direction transverse to the axis of rotation 22 of the base body 16, controlled by an inclined plane 32, and can thus move radially in and out of the shaping chamber 20. The inclined plane 32 of the roller carrier 30 is part of a wedge mechanism 34 using a corresponding counter-wedge 36 for each profile roller 18. If the respective counter-wedge 36 is displaced upwards in the axial direction parallel to the axis of rotation 22, as viewed in the direction of Figure 1, the wedge surfaces slide off one another, taking the inclined plane 32 into account, and the respective profile roller 18 is fed inwards towards the shaping chamber 20.During the opposite movement, i.e., when the counter wedge 36 moves downward as viewed in Figure 1, the individual profile rollers 18 move away from each other again in a plane transverse to the rotation axis 22, resulting in the cylindrical forming space 20 expanding in diameter. For the corresponding movement of the profile rollers 18, the respective roller carrier 30 is guided in an associated travel groove 38 in the base body 16, which is constructed in several parts and consists of a base part 40 and a head part 42, which are firmly connected to one another.

[0029] The respective counter wedge 36, as a guide body 44, is connected on the foot or bottom side, as viewed in the direction of Figure 1, to an annular holding body 46, which, in its axial extension, merges into a hollow cylindrical shaft 48, which is part of a drive 50 (Figure 2). For this purpose, a bearing 52 is fixedly mounted on the shaft 48 by means of a locking nut 53, which can be moved axially back and forth in the double arrow direction parallel to the longitudinal or rotational axis 22 of the tool by means of an advancing device 54, for example in the form of a linear drive (not shown), which is only indicated in Figure 2.If, as viewed in the direction of Figure 2, the bearing 52 is moved to the right by means of the feed device 54, the shaping space 20 is correspondingly narrowed by means of the fed profile rollers 18 via the hollow shaft 48, the plate-shaped holding body 46 and the described wedge drive in the form of the wedge mechanism 34; it is also enlarged if the bearing 52 is moved to the left by means of the feed device 54.

[0030] For the associated axial travel movement of the holding body 46, as viewed in the direction of Figure 1, between a lower stop point along a horizontal contact surface 47 on the base part 40 and an opposite, parallel, further contact surface 49 on the head part 42 as the upper stop position, a correspondingly dimensioned travel space 55 is provided within the base body 16. The overall height of the travel space 55 is selected such that during the maximum travel movement of the plate-shaped holding body 46, as viewed in the direction of Figure 1, upwards, the bearing unit consisting of bearing 52 and locking nut 53 comes into contact with, or almost into contact with, the underside of the outer pinion 60 and the stepped base part 40 of the base body 16.

[0031] For the roll forming process itself, the tool as a whole is guided in a rotational manner about the rotational axis 22 by means of an additional drive 56. This is a toothed belt drive with a drivable toothed belt 58 and an associated external pinion 60 on the outer circumference of the base body 16. The external pinion 60, which is fixed circumferentially on the base part 40 of the base body 16, rotates the base body 16 with all its components about the rotational axis 22 when the additional drive 56 in the form of the toothed belt drive with the toothed belt 58 is actuated. For the corresponding rotational drive of the tool, the tool is guided on the outer circumference via an additional bearing point 62 in a tool holder of a work machine 64, which is only partially shown in Figure 2. Instead of the additional drive 56 by means of a toothed belt 58 and external pinion 60, a different rotational drive can also be used.The illustrated belt drive or, alternatively, a gear drive allows the rotational drive of the tool head in the form of the base body 16 to be implemented laterally offset. As described, the tool head or base body 16 is supported by means of rolling bearings attached to the tool body as the additional bearing point 62 in the working machine 64. However, the drive and bearing can also alternatively be implemented in a machine-side spindle with a defined interface to the base body 16 or the tool head; in this case, the rolling bearing and the associated drive element on the base body 16 are omitted.

[0032] The respective profile roller 18 is rotatably guided on its associated roller carrier 30 and provided with a rotation axis 66 parallel to the rotation axis 22 of the base body 16. The respective profile roller 18 has a projecting, circumferential shaped part 68 approximately in the center and on the outer circumference, the bead-like shape of which is adapted to the groove-shaped depression 14 to be created in the workpiece 10. The respective profile rollers 18 are made of hard, wear-resistant material, for example in the form of steel, hard metal or ceramic, and thus form the constriction 14 to be created with their outer profile, taking into account the elasticity of the workpiece 10. As explained, the rollers 18 are rotatably mounted on their roller carriers 30, for example using at least one rolling bearing 69 as shown in Figure 1. However, plain bearings can also be used instead of rolling bearings 69.It is understood that during the bead production process, the roller supports 30 with their associated profile rollers 18 are progressively advanced radially from the outside onto the hollow cylindrical workpiece 10 by a predeterminable distance using the wedge mechanism 34, which is controllable by means of the drive 50, in order to progressively produce the desired bead depth T (Figure 5) in the workpiece 10. During the bead production process, the tool as a whole rotates with its base body 16 around the rotation axis 22, and to this extent the individual profile rollers 18 also begin to rotate along their axes of rotation 66, in which their movement paths unfold along the desired bead profile.

[0033] For securing the workpiece 10 to be machined in the shaping space 20, the further adjustment device 26 has a receptacle 70 on its free end face as a workpiece receptacle 28, which preferably receives a free edge region 72 of the hollow cylindrical shell 12 in question. The receptacle 70 of the workpiece 10 in question is shown in particular in Figures 2 and 4 to 7. As Figures 1 and 2 further show in particular, the further adjustment device 26 has a rotationally fixed axis 74 which passes through the hollow cylindrical shaft 48 of the drive 50 concentrically to the rotation axis 22 of the base body 16.While the holder 70 for the workpiece 10 is rotationally fixedly attached to one free end of the axis 74, an engagement point 76 in the form of a flange-like widening for a further feed device 78 is provided at the opposite free end, by means of which the further adjustment device 26, i.e. the axis 74 with the holder 70, can be moved in and out of the forming chamber 20. This further feed device 78 can, for example, be formed from a stamp-like linear cylinder capable of axially moving the axis 74 with the workpiece holder 70 back and forth in the direction of the rotation axis 22 in the direction of the double arrow. For this axial movement, as shown in Figure 1, the axis 74 is guided in two bearings 80, 82 within the shaft 48: one in the area of ​​the drive 50 with the bearing 52 and the other in the area of ​​the axially movable holding body 46 with the three guide bodies 44.

[0034] The holder 70 for the hollow-cylindrical workpiece 10 in the form of a thin-walled, cup-shaped container (can) has a cup-shaped receiving ring 84, into which a stepped counterholder 86 with a reduced outer diameter engages, so that a circumferential annular gap 88 is formed between the inner peripheral side of the receiving ring 84 and the outer peripheral side of the counterholder 86 in the engagement area (Figure 6). The gap size 88 is selected such that the free edge region 72 of the cup-shaped workpiece 10 engages flush with the annular gap 88 such that the front end of the hollow-cylindrical shell 12 comes into contact with an adjacent shoulder in the receiving ring 84. The engagement length in the annular gap 88 by the workpiece 10 is in any case dimensioned such that the groove-shaped depression 14 or constriction can be introduced by means of the profile rollers 18 adjacent to and pointing in the direction of the cup bottom 90.The corresponding initial state for the container shown on the left in Figure 8 is shown in particular in Figures 4 and 6. Before the bead formation begins, in which the respective profile roller 18 with its circumferential shaped part 68 is not yet in engagement with the outer wall in the form of the shell 12 of the workpiece 10, a distance X1 exists between the respective circumferential shaped part 68 and the free outer edge of the receiving ring 84.

[0035] If the circumferential recess 14 is now created using the respective rolling tool 18, as can be seen from the illustration in Figures 5 and 7, the profile rollers 18 are advanced onto the casing 12 via the wedge mechanism 34 and engage therein. Furthermore, for material feed for the bead or groove design, the holder 70 is advanced axially onto the respective engaged profile roller 18 along the rotation axis 22, which is now also the advance axis for the holder 70, and the previously discussed distance X1 according to Figures 4 and 6 is reduced to the distance X2 shown in the illustration in Figures 5 and 7. Both the holder ring 84 and the counterholder 86 are arranged in a rotationally fixed manner on the front end of the axis 74 by means of an engagement screw 92 and are thus stably supported in their axial movement into the shaping space 20.Since, in particular according to the illustration in Figure 5, the profile rollers 18 act evenly on the wall thickness of the workpiece 10 from all sides, the bead or groove profile introduced in this respect is correspondingly uniform, the possible bead depth being shown as T in Figure 5.

[0036] In this manufacturing process, a hold-down device in the form of the tool holder 70 is used centrally in the tool in the form of the base body 16, which is independent of the axial and rotating tool movement. The hold-down device or holder 70 with the components 84 and 86 is moved actively and synchronously by the further feed device 78 to reshape the bead profile in such a way that the required material flows in, which is particularly evident from the illustration in Figures 4 to 7. During this feed of material, axial forces are generally generated which, particularly in the upper, open area of ​​the cup-shaped can, are capable of producing permanent, undesirable deformation. Therefore, the holder in the form of the annular gap 88 is designed such that the open, very unstable edge of the cup (can) is enclosed, supported, and thus stabilized.This prevents, or at least reduces, undesirable deformations such as bulging of the shell 12 or ovality at the free, open end of the workpiece 10.

[0037] Due to the two-part construction of the holder 70, comprising a receiving ring 84 and a counterholder 86, materials with different properties can also be used for the correspondingly constructed hold-down device. For example, hard, wear-resistant materials can be used in the outer part for the receiving ring 84, and softer, low-friction materials in the inner part of the holder 70 in the form of the counterholder 86. The internal cylindrical gap contour of the hold-down device, in the form of the gap 88 of the holder 70, is in any case shaped in such a way that the desired geometry of the constriction 14 is supported from the inside, similar to a support mandrel. The amount of the supply path of wall material corresponds approximately to the required additional material length of the constriction in the form of the groove-like depression 14.

[0038] In a particularly preferred embodiment of the solution according to the invention, it can also be provided that a further feed movement is exerted on the base 90 of the workpiece 10 in the opposite direction to the feed movement via the axis 74 by means of a further feed device (not shown in detail), so that material from the casing 12 can also flow from the opposite direction into the bead in the form of the recess 14. The tool shown, in the form of a modular tool head, is very compact in design, so that the tool in question proves to be particularly suitable for use in linked machines with multiple stations for the production of large quantities with very short processing times. This has no equivalent in the prior art.

Claims

Patent claims 1. Tool for producing groove-shaped depressions (14), in particular beads, in hollow cylindrical workpieces (10) using a roll forming process, with a base body (16) and profile rollers (18) arranged thereon, which delimit a shaping space (20) in which the workpiece (10) can be received and which are guided in the base body (16) by means of an adjusting device (24) so ​​as to be retractable and extendable into the shaping space (20), characterized in that by means of a further adjusting device (26), which at least partially passes through the base body (16), a workpiece holder (28) for the workpiece (10) can be moved longitudinally in the direction of the shaping space (20) and in the opposite direction.

2. Tool according to claim 1, characterized in that the adjusting device (24) has a roller carrier (30) for each profile roller (18) which is movable in the radial direction transverse to the axis of rotation (22) of the base body (16) under the control of an inclined plane (32) and thus moves in and out of the shaping space (20).

3. Tool according to claim 1 or 2, characterized in that the respective inclined plane (32) is a component of a guide body (44) which is guided by means of a drive (50) parallel to the rotation axis (22) of the base body (16).

4. Tool according to one of the preceding claims, characterized in that the drive (50) has a hollow cylindrical shaft (48), at one end region of which the guide bodies (44) are arranged and at the other end region of which, as part of the drive (50), an infeed device (54) acts, by means of which the shaft (48) axially to the axis of rotation (22) of the base body (16) in this deteriorable.

5. Tool according to one of the preceding claims, characterized in that a further drive (56) acts on the outer circumference of the base body (16), by means of which drive the base body (16) can be rotated about its axis of rotation (22) together with the guide bodies (44) and the profile rollers (18).

6. Tool according to one of the preceding claims, characterized in that the respective profile roller (18) is rotatably guided on its associated roller carrier (30) and is provided with an axis of rotation (66) parallel to the axis of rotation (22) of the base body (16).

7. Tool according to one of the preceding claims, characterized in that the respective profile roller (18) has a projecting, circumferential shaped part (68) on the outer circumference, the shape geometry of which is adapted to the groove-shaped recess (14) to be created in the workpiece (10).

8. Tool according to one of the preceding claims, characterized in that for fixing the workpiece (10) to be machined in the shaping space (20), the further adjusting device (26) has a receptacle (70) as part of the tool receptacle (28), which preferably receives a free edge region (72) of the respective hollow cylinder-like casing (12).

9. Tool according to one of the preceding claims, characterized in that the further adjusting device (26) has a rotationally fixed axis (74) which concentrically to the axis of rotation (22) of the base body (16) the shaft (48) of the drive (50) passes through and has the receptacle (70) for the workpiece (10) and an engagement possibility (76) for a further feed device (78), by means of which the further adjusting device (26) can be moved in and out of the forming space (20).

10. Method for producing channel-shaped depressions (14), in particular beads, in hollow cylindrical workpieces (10) using roll forming, preferably with a tool according to one of the preceding claims, characterized in that while the bead pattern is being introduced into the workpiece (10) by means of the profile rollers (18), an axial feed movement onto the workpiece (10) is carried out by means of an adjusting device (26) in such a way that material of the workpiece (10) flows into the bead pattern.

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