EP3609634B1 - Multi-piece rolling tool with floating support and rolling machine - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION

The invention relates to a rolling tool with a base body for fastening the rolling tool in a rolling machine and a profile part for shaping a workpiece to be rolled.

Such rolling tools are used to produce specific outer contours of rotationally symmetrical components. The outer contours produced in this way are, in particular, threaded sections and other profiles, such as spirals. The components are in particular screws, threaded bolts, ball bolts, etc.

The blank is produced before the workpiece to be rolled is shaped. This production of the blank is mostly done by forming and in particular by cold extrusion. The subsequent shaping process is carried out by forming and in particular by cold forming.

STATE OF THE ART

A curling die having a body for mounting the curling die in a curling machine and a profile member for shaping a workpiece to be rolled according to the preamble of claim 1 and a curling machine according to the preamble of claim 13 is known from US patent U.S. 1,524,327 famous. The base body and the profile part are designed in several pieces. The profile part has a considerable thickness and is many times thicker than the plate-like base body. The profile part is firmly connected to the base body by means of screw connections. The plate-like base body is form-fitting, but with play, guided in two grooves in the holder of the rolling machine for the base body. Undercuts forming the grooves. As a result, the entire rolling tool is movably mounted in a plane perpendicular to the rolling direction relative to the rolling machine.

A curling tool having a body for mounting the curling tool in a curling machine and a profiling section for shaping a workpiece to be rolled is known from US patent U.S. 1,979,919 famous. The entire rolling tool is held in a defined position on an assigned receptacle of the rolling machine by means of two oppositely acting springs. The rolling tool can be moved to a limited extent against the spring forces. The rolling tool is permanently pressed back into its initial position due to the spring forces.

A rolling tool with a base body for fastening the rolling tool in a rolling machine and a profile part for shaping a workpiece to be rolled is known from the German patent application DE 102 12 256 A1 famous. The base body and the profile part are designed in several pieces. The profile part has a strongly changing thickness. There are a number of screw connections for connecting the parts. In this case, screws are screwed through through-holes in the base body into threaded holes in the profile part.

A further rolling tool with a base body for fastening the rolling tool in a rolling machine and a profiling section for shaping a workpiece to be rolled is known from the German patent application DE 195 20 699 A1 famous. The rolling tool can be segmented in such a way that it has a plurality of profiling sections. Different functions are assigned to the different profiling sections. In this way, individual profiling sections can be exchanged, so that the resulting outer contour of the workpiece to be machined can be changed. The protruding and recessed areas forming the geometry of the profiling section were introduced into a block-like blank, so that functionally the base body and the profiling section are created.

A further rolling tool with a base body for fastening the rolling tool in a rolling machine and a profiling section for shaping a workpiece to be rolled is known from the German patent application DE 10 2004 056 921 A1 famous. The protruding and recessed areas of the profiling section that form the geometry of the profile part were introduced into a block-like blank, so that functionally the base body and the profile part are created.

A further rolling tool with a base body for fastening the rolling tool in a rolling machine and a profiling section for shaping a workpiece to be rolled is known from the German patent DE 10 2004 014 255 B3 famous. The off-track force due to an unwanted offset between the pair of rolling dies is measured by a sensor. The sensor signal then enters a control circuit as a controlled variable. Depending on the sensor signal, the alignment between the rolling tools, one of which is fixed and one of which is movable, is changed.

Other rolling tools are from the German patent DE 10 2004 014 255 B3 , the European patent EP 1 529 579 B1 and the PCT Application WO 2011/059658 A1 famous.

A punching machine with a movable punching plate and a method for detachably fastening a punching counter-plate by means of vacuum are known from the German patent application DE 36 20 853 A1 famous.

the US 1,524,327A and the US 1,979,919A each relate to rolling tools with base bodies for attachment in rolling machines and profile parts for shaping workpieces, the base body and the profile part being connected to one another.

the GB 1 282 747 A concerns an improvement for rolling tools for the production of threads.

OBJECT OF THE INVENTION

The invention is based on the object of significantly reducing the costs incurred in the course of refurbishing a worn rolling tool and at the same time improving the quality of the outer contour of the workpiece produced by rolling.

SOLUTION

The object of the invention is achieved according to the invention with the features of the independent patent claims.

Further preferred configurations according to the invention can be found in the dependent patent claims.

DESCRIPTION OF THE INVENTION

The invention relates to a rolling tool with a base body for fastening the rolling tool in a rolling machine and a profile part for shaping a workpiece to be rolled. The base body and the profile part are designed in several pieces and can be connected to one another and separated from one another without being destroyed. In their connected position, the base body and the profile part are mounted so as to be movable relative to one another in a plane perpendicular to the rolling direction, exclusively overcoming the static friction between them.

The invention further relates to a reeling machine according to claim 12 and a reeling machine according to claim 13.

For the desired shaping of the workpiece to be rolled, this is brought into contact with a pair of rolling tools. When reference is made to a rolling tool in this application, this means one of the pair of rolling tools and not the entire pair.

If the rolling tools are rolling dies, one of the rolling dies is usually firmly clamped in the rolling machine. The second roller die is attached to a movable receptacle - in particular a carriage - of the rolling machine. It usually has a greater length and is guided past the fixed roller die at a defined distance - the so-called roller gap. The workpiece to be rolled is introduced into this roll gap. The rolling dies each have the profiling section on their side surface facing the workpiece.

The movable bearing between the base body and the profile part represents a floating bearing. The floating bearing is realized in particular on the stationary rolling die. However, it can also be implemented additionally or alternatively on the movable roller die. In particular, it is only present on one roller die. The same applies to other types of rolling tools, in particular rolls, rings or ring segments. Even if the floating mounting is only implemented on one rolling die or another rolling tool, the other rolling die or the other rolling tool can have a separate thin profile part. Thus, the advantages of easy interchangeability and material and cost savings are also used independently of the floating bearing.

The new at least two-part rolling tool with a floating bearing between the base body and the profile part optimizes the rolling process in a number of ways. The optimization affects both the costs incurred in the course of reconditioning a worn rolling tool and the quality of the outer contour of the workpiece produced by rolling. This also reduces the costs incurred as part of the entire rolling process.

As for example in the German patent mentioned above DE 10 2004 014 255 B3 as described in detail, misalignment of the profiling portions of the roller dies of the pair of roller dies creates an unwanted off-track force. According to the invention, this tracking error force is now used to use the translational degree of freedom provided by the floating mounting for the corrective self-alignment of the rolling tools.

By allowing relative movement between the body and profile part in their connected position in a plane perpendicular to the rolling direction, they can use the off-track force present during rolling to align themselves relative to each other and the position of the profile part of one rolling tool relative to the profile part of the other rolling tool to optimize.

This new mobile bearing, bearing with a translational degree of freedom, bearing with a desired play or also floating bearing, does not affect the plane in which the rolling direction is located. The rolling forces have to be transmitted in the plane of the rolling direction, so that such a floating bearing is not suitable there. This movable Rather, storage relates to a plane running perpendicular to the rolling direction, such as that in 6 , 7 and 8th is shown. This bearing serves to allow a profile part of a rolling tool or both profile parts of the rolling tools a limited movement in this plane in order to reach or at least approach the ideal relative position. This is automatically achieved by allowing the relative movement, since the rolling forces are lowest in this ideal position and the profile part therefore assumes them automatically if it has the appropriate mobility.

In their connected position in the plane perpendicular to the rolling direction, the base body and the profile part are preferably movably mounted relative to one another along only one axis, namely a movement axis Z. The profile part has a length L and a width B, the rolling direction being parallel to the length L of the profile part and the movement axis Z parallel to the width of the profile part. Strictly speaking, the rolling direction is the sense of the rolling direction, since the rolling direction not only indicates a position in space, but is also directed. Instead, floating mounting is about mobility in two opposite directions along one axis, i. H. back and forth.

This can also be described in such a way that the movement axis Z corresponds to the longitudinal axis of a workpiece to be rolled that is held in the rolling tool 5 . If the workpiece is z. B. is a screw, so the axis of movement Z corresponds to the longitudinal axis of the screw.

In their connected position, the base body and the profile part are mounted so as to be movable relative to one another in a plane perpendicular to the rolling direction, exclusively overcoming the static friction between them. This means in particular that the base body and the profile part are so movably connected to one another that after a relative movement they cannot be actuated by a restoring means, e.g. B. are a spring applied back to an initial position. Instead, they are free to assume and maintain their ideal relative position to one another.

Before the first workpiece is rolled, there is a rough manual pre-alignment between the profile part and the base body, e.g. B. by stops or adjustment devices. These are then removed before rolling the first workpiece.

The first workpiece is then rolled. In this case, the movable profile part is automatically aligned relative to the base body along the axis of movement Z. It is therefore tracked to the working point. If the difference between the preset and the work point was too large, the first workpiece is scrap.

With the following workpieces, the rolling process now begins from the working point. So there is no return to a starting position. Due to the mobility that is still present along the movement axis Z (i.e. back and forth), the rolling tool can continue to adapt to the geometric conditions that change slightly from workpiece to workpiece. Only the static friction between the movable profile part and the base body has to be overcome. The force required for this is provided by the rolling process.

The automatic adjustability is made easier in particular by the fact that the profile part has a low mass due to its small thickness and therefore also a low mass inertia. Furthermore, the holding forces applied can be low, so that only a small amount of force has to be applied overall to overcome the static friction.

This movable or floating mounting is not to be understood as meaning a mounting that does not achieve the desired fixed mounting only because of unavoidable tolerances or other unwanted errors. In order to distinguish the invention numerically from such random degrees of freedom, the extent of mobility along only one axis, namely the axis of movement, in the plane perpendicular to the rolling direction can be at least 0.1 mm, in particular between 0.1 mm and 0.3 mm, in particular between 0.1 mm and 0.2 mm, in particular about 0.1 mm.

To enable this degree of translational freedom, there is no stop within the area required for the movement. However, for the correct placement of the profile part on the base body, a stop can be provided which lies outside of this surface required for self-alignment. However, this stop has no function during the rolling process.

The holding force provided by Z a connecting means between the base body and the profile part can be designed to be adjustable. This holding force can be additional or alternative be designed to be deactivated in order to easily allow a replacement of a profile part that is worn or has to be replaced for other reasons.

Many advantages are achieved through the separate production and multi-piece design of the rolling tool in the sense of a constructive division into the base body and the profile part. Surprisingly, these also include a significant cost reduction in the maintenance of the rolling tool.

Like other tools, rolling tools are subject to wear and tear with use. In the case of rolling tools, this wear occurs in the area of their profiled surface for shaping the workpiece. If this profiling section is worn to such an extent that proper processing of the workpieces to be rolled is no longer possible, restorative post-processing must be carried out. Since the user of the rolling tool is usually not technically able to do this, the rolling tool is sent back to the rolling tool manufacturer by post or freight forwarder. Since a rolling tool has a considerable mass, which can be between about 0.5 and 50 kg, for example, depending on its size, this sending the rolling tool back and forth results in considerable freight costs.

This problem is solved or significantly reduced in that the rolling tool is divided into two parts, namely a base body and a profile part, and these parts are treated differently. Since the base body is normally not subject to any or at least no significant wear during use of the rolling tool, it can remain with the user of the rolling tool. To prepare for maintenance, the profile part is separated from the base body and only the profile part is sent to the maintenance technician. This significantly reduces the mass and volume of the part to be shipped and thus the freight costs.

The fact that the base body and the profile part consist of multiple pieces means that they can be made from different materials and/or can be subjected to different machining processes. It is thus possible, for example, to produce the base body from a comparatively lower quality and therefore more cost-effective material. The base body can consist of mild steel, for example. The profile part is preferably made of a higher quality, harder and more wear-resistant material. It can be z. B. act to carbide or high-speed steel (HSS).

With the new rolling tool, a significant proportion of the volume can only function as a carrier material with correspondingly reduced material requirements. The volume proportion of the actual functional part - namely the profile part - is reduced in comparison and can meet higher material requirements in an economical manner.

Although the base body and the profile part are manufactured separately as separate parts, they are matched to one another in such a way that they can be joined together to form the rolling tool. This merging is done in such a way that the later separation is possible without destruction.

The profile part can be designed as a rolled thread part with a pitch and the degree of mobility along only one axis, namely the movement axis, in the plane perpendicular to the rolling direction is at least 5%, in particular at least 8%, in particular at least 10%, in particular between 5% and 15% %, in particular about 10%. Otherwise there is the problem that several tracks are produced and thus a faulty thread is rolled.

In the operating position of the rolling unit in the rolling machine, the base body and the profile part can be designed so that they can be connected to one another by negative pressure, magnetism or spring force. The desired floating mounting is realized with these non-positive connection techniques and at the same time the required contact pressure is achieved.

The profile part can have a smaller thickness than the base body and/or 10 mm or less. Thus, the mass of the profile part to be sent for maintenance or to be completely replaced is significantly reduced. The thickness of the profile part is preferably chosen so that the desired number of maintenance measures is possible. During maintenance, the worn profile section is either partially or completely removed and a new intact profile section is installed. This obviously results in a decrease in the height of the profile part. The initial height of a new profile part is therefore preferably selected in such a way that the thickness of the profile part is still sufficient for the proper functioning of the rolling tool after the desired number carried out by maintenance measures. The maintenance measure is in particular regrinding.

The thickness of the profile part is preferably selected in such a way that it can absorb the rolling forces occurring during the rolling process in the rolling direction with the necessary reliability without being deformed or even breaking.

However, it is also possible that a worn profile part is not restored but replaced with a new profile part. The two rolling tools are arranged in the rolling machine at a defined distance from one another - the so-called roll gap. The workpiece to be rolled is introduced into this roll gap. When the rolling dies are repaired, the thickness of the rolling die decreases, so the roll gap changes and has to be readjusted. So if a worn profile part is not repaired, but replaced by a new profile part, the set-up effort in terms of setting the roll gap is only incurred once.

The maximum thickness of the profile part can be about half the thickness of the base body. This means that a sufficiently large number of maintenance measures can be carried out and at the same time the desired reduction in mass and weight of the profile part to be replaced is achieved. With a greatly reduced thickness of the profile part, one can also speak of a "rolled sheet".

The profile part therefore has a comparatively small maximum thickness. The maximum thickness of the profile part is to be understood as meaning the thickness at its thickest point. The profile part often has a thickness that remains approximately the same over its length and width, so that this corresponds to the maximum thickness at the same time. However, if the profile part has a thickness that changes in cross section and/or longitudinal section (as is the case, for example, in the prior art according to DE 102 12 256 A1 is the case), so this is the area of its greatest thickness. Reducing the thickness of the profile part at its thickest point results in the desired saving in material.

The maximum thickness of the profile part can be between 4 mm and 10 mm, in particular between 4 mm and 8 mm. Such a thin profile part compared to the prior art leads to a significant reduction in the costs incurred in the repair of a worn rolling tool.

Viewed in the radial direction of the workpiece to be rolled, the profile part can be arranged on the base body. So if you z. B. assumes that the rolling tool is a cuboid whose upper surface is formed by the profile part, the plane of separation between the base body and the profile part extends in a plane parallel to this upper surface inside the cuboid.

The profile part can have a profiling section for shaping the workpiece to be rolled and a connecting section for connecting to the base body. The base body can have no profiling section for shaping the workpiece to be rolled, but a fastening section for fastening in a rolling machine and a connection section for connection to the profile part. The separation of base body and profile part is done in such a way that the shaping function is assigned solely to the profile part and the attachment function in terms of attachment in the rolling machine is assigned solely to the base body.

The profiling section has a profile depth. Depending on the planned maintenance measure, the thickness of the profile part can be a multiple of the profile depth of the profiling section of the profile part. In particular, it is approximately twice the tread depth. As a rule, one tread depth is processed with one maintenance measure.

In the operating position of the rolling tool in a rolling machine, the base body and the profile part can be designed so that they can be connected to one another by vacuum. Such a vacuum connection ensures the non-destructive separation of the two parts in a particularly simple manner. Connecting the base body and profile part does not require any special tools either. It only has to be ensured that the profile part and the base body are inserted into the rolling machine in such a way that the vacuum channels available for applying the vacuum can become effective.

The base body and the profile part can also be designed to be connected to one another by magnetism or spring force. It is also possible to combine these types of connection with each other or with the vacuum connection described above.

The rolling tool can be designed as a rolling die. Rolling dies are the cuboid, relatively flat rolling tools described above (see e.g. 7 the German patent application DE 10 2004 056 921 A1 the applicant).

But it is z. B. also possible that the rolling tool is designed as a roller, ring or ring segment.

If the rolling tool is designed as a roller, the core of the roller is formed by the base body with an essentially round cross section—possibly with lugs, grooves, recesses for the drive or other profiles. The outer peripheral surface of the roller has the profiling section and is part of the profile part, which has an annular cross-section.

If the split rolling tool is a ring segment, the profile part has a cross section in the shape of a segment of a circular ring. At least the connecting section of the base body is then also designed in the form of a section of a circular ring.

The rolling tool can B. Be part of a roll/ring segment tool (see e.g. 8 the German patent application DE 10 2004 056 921 A1 the applicant). With such a roll/ring segment tool, one roll tool is designed as a round roll and the other roll tool is designed as a ring segment. The scroll tool can also be part of a scroll/roll tool.

The profile part of the rolling tool can be divided into several segments. In particular, these segments then have different geometries, so that different geometries can be produced on a workpiece with the rolling tool. The segments are divided in particular along the longitudinal axis of the workpiece.

A movement drive can be assigned to the rolling tool. The movement drive serves to support the relative movement between the profile part and the base body by motor. The movement drive can in particular have a motor, in particular an electric motor, and a coupling element which is operatively connected to the profile part. The motor drives the coupling element in a reciprocating translational or rotational manner. This Movement is transmitted to the profile part by the coupling element and thus brings about the desired translational movement of the profile part relative to the base body.

The movement drive can have a movement sensor unit. The movement sensor unit detects and amplifies a relative movement between the profile part and the base body that automatically results from the rolling process. As soon as the track error force is no longer available or falls below a limit value, the motor is switched off. When the tracking error force changes direction, the direction of rotation of the motor is reversed.

A further aspect of the invention relates to a new rolling machine with a vacuum connection or magnet for achieving the firm connection between the base body and the profile part of the new multi-piece rolling tool.

Advantageous developments of the invention result from the patent claims, the description and the drawings.

BRIEF DESCRIPTION OF THE FIGURES

Fig. 1

zeigt eine schematische Seitenansicht eines Teils einer ersten beispielhaften Ausführungsform einer neuen Rollmaschine mit zwei Rollwerkzeugen zu Beginn der formgebenden Bearbeitung eines zu rollenden Werkstücks.

Fig. 2

zeigt eine teilweise geschnittene schematische Ansicht einer weiteren beispielhaften Ausführungsform des neuen Rollwerkzeugs mit Unterdruckkanälen.

Fig. 3

zeigt eine teilweise geschnittene schematische Ansicht eines Paars einer weiteren beispielhaften Ausführungsform des neuen Rollwerkzeugs mit in die Rollmaschine integrierten Grundkörpern mit Unterdruckkanälen.

Fig. 4

zeigt eine teilweise geschnittene schematische Ansicht einer weiteren beispielhaften Ausführungsform der neuen Rollmaschine mit einem Unterdruckanschluss.

Fig. 5

zeigt eine schematische Ansicht eines Paars einer weiteren beispielhaften Ausführungsform des neuen Rollwerkzeugs mit Magnethaltern.

Fig. 6

zeigt eine schematische Ansicht eines Paars einer weiteren beispielhaften Ausführungsform des neuen Rollwerkzeugs mit Magnethaltern und Federn.

Fig. 7

zeigt eine schematische Seitenansicht eines Teils einer weiteren beispielhaften Ausführungsform der neuen Rollmaschine mit zwei Rollwerkzeugen mit einer NutFeder-Verbindung zu Beginn der formgebenden Bearbeitung eines zu rollenden Werkstücks.

Fig. 8

zeigt eine schematische Ansicht eines Paars von Rollwerkzeugen mit einem relativ zu seinem zugehörigen Grundkörper beweglich gelagerten Profilteil mit einem ersten Spurfehler.

Fig. 9

zeigt eine schematische Ansicht des Paars von Rollwerkzeugen gemäß Fig. 8 mit einem zweiten Spurfehler.

Fig. 10

zeigt eine schematische Ansicht eines Paars von Rollwerkzeugen gemäß Fig. 8 in der ausgerichteten Stellung ohne Spurfehler.

Fig. 11

zeigt eine Schnittansicht einer weiteren beispielhaften Ausführungsform der neuen Rollwerkzeuge.

Fig. 12

zeigt eines der Rollwerkzeuge aus Fig. 11.

Fig. 13

zeigt eine Seitenansicht des Rollwerkzeugs gemäß Fig. 10.

Fig. 14

zeigt eine schematische Draufsicht einer weiteren beispielhaften Ausführungsform der neuen Rollwerkzeuge mit einem Bewegungsantrieb.

Fig. 15

zeigt eine schematische Seitenansicht eines der Rollwerkzeuge gemäß Fig. 14.

Fig. 16

zeigt eine perspektivische Ansicht einer beispielhaften Ausführungsform der neuen Rollwerkzeuge zur Erläuterung der geometrischen Verhältnisse.

The invention is further explained and described below with reference to preferred exemplary embodiments illustrated in the figures.

1

shows a schematic side view of part of a first exemplary embodiment of a new rolling machine with two rolling tools at the start of the shaping of a workpiece to be rolled.

2

shows a partially sectioned schematic view of a further exemplary embodiment of the new rolling tool with vacuum channels.

3

shows a partially sectioned schematic view of a pair of a further exemplary embodiment of the new rolling tool with base bodies with vacuum channels integrated into the rolling machine.

4

shows a partially sectioned schematic view of a further exemplary embodiment of the new rolling machine with a vacuum connection.

figure 5

Figure 12 shows a schematic view of a pair of another exemplary embodiment of the new rolling tool with magnet holders.

6

Figure 12 shows a schematic view of a pair of another exemplary embodiment of the new coiling tool with magnet holders and springs.

7

shows a schematic side view of part of a further exemplary embodiment of the new rolling machine with two rolling tools with a tongue and groove connection at the beginning of the shaping processing of a workpiece to be rolled.

8

shows a schematic view of a pair of rolling tools with a profile part that is movably mounted relative to its associated base body and has a first track error.

9

FIG. 12 shows a schematic view of the pair of curling tools according to FIG 8 with a second track error.

10

FIG. 12 shows a schematic view of a pair of curling tools according to FIG 8 in the aligned position with no track error.

11

shows a sectional view of another exemplary embodiment of the new rolling tools.

12

shows one of the rolling tools 11 .

13

shows a side view of the rolling tool according to FIG 10 .

14

shows a schematic plan view of a further exemplary embodiment of the new rolling tools with a movement drive.

15

shows a schematic side view of one of the rolling tools according to FIG 14 .

16

shows a perspective view of an exemplary embodiment of the new rolling tools to explain the geometric relationships.

FIGURE DESCRIPTION

1 shows a schematic side view of a first exemplary embodiment of a new rolling machine 1, shown only in parts, for shaping a workpiece 2 to be rolled. In the present example, workpiece 2 is a screw 3 act to be processed workpiece 2.

The rolling machine 1 has two receptacles 4, each of which is used to attach a rolling tool 5 of a pair of rolling tools 5. In the present example, the rolling tools 5 are designed as cuboid or plate-shaped rolling dies. However, they could also have a slightly different geometry.

Apart from the design of the rolling tools 5, the further details of this embodiment of the rolling machine 1 correspond to the prior art, so that a further description can be dispensed with.

The respective rolling tool 5 has a base body 6 for fastening the rolling tool 5 to the mount 4 of the rolling machine 1 . The rolling tool 5 also has a profile part 7 for shaping the workpiece 2 to be rolled. The base body 6 and the profile part 7 were produced as separate elements - ie they are designed in several pieces - and were then connected to form the rolling tool 5 with each other. In this way, the base body 6 and the profile part 7 can be connected to one another and can be separated from one another in a non-destructive manner.

The profile part 7 is arranged on the base body 6 viewed in the radial direction 8 of the workpiece 2 to be rolled.

The profile part 7 has a profiling section 9 for shaping the workpiece 2 to be rolled. The profiling section 9 has a profiled outer geometry with protruding areas and recessed areas that correspond to the desired outer geometry of the workpiece 2 to be rolled. In the example shown here, the profiling section 9 is used to roll the thread 10 of the screw 3. However, it could also have a different geometry and be used to roll a different outer contour.

The profile part 7 also has a connecting section 11 for connecting to the base body 6 . The connecting section 11 is arranged opposite the profiling section 9 and extends essentially at a distance from and parallel thereto. The base body 6 has a corresponding connection section 12 for connection to the connection section 11 of the profile part 7 . The base body 6 has a fastening section 20 for fastening in the rolling machine 1 opposite the connecting section 12 .

In the example shown, the two connecting sections 11, 12 and thus the profile part 7 and the base body 6 are connected to one another by a connecting technique that is not shown. These are negative pressure, magnetism, positive locking and/or spring force, as will be explained further below.

In the example shown, the profile part 7 has a smaller thickness than the base body 6 . It is less than half the thickness of the base body 6.

As in 1 is shown symbolically by means of the arrow 13, in this case the upper rolling tool 5 is stationary and the lower rolling tool 5 is arranged and driven so as to be movable in the direction of the arrow 13. The arrow 13 corresponds to the direction of rolling 23 (more precisely, the direction of rolling). During the movement of the lower rolling tool 5 in the direction of the arrow 13, the blank of the workpiece 2 is received between the profiling sections 9 and shaped accordingly. This type of reshaping is known per se in the prior art and is therefore not described further here below.

2 shows a first specific type of connection between the base body 6 and the profile part 7. In this case, the connection is realized by applying a negative pressure. The base body 6 has one or more vacuum channels 17 for this purpose. The negative pressure channels 17 are connected in terms of pressure to the connecting section 11 of the profile part 7 so that they exert the desired negative pressure effect and the resulting connecting effect on the profile part 7 .

The outer geometry of the profiling section 9 is 2 good to see. Furthermore, it can be seen that the connecting sections 11, 12 are each formed as flat surfaces.

In 3 a further embodiment of the rolling machine 1 is shown, in which the base body 6 is part of the rolling machine 1 . In this case, the connection between the connecting sections 11, 12 is again realized via negative pressure, which is present via the negative pressure channels 17.

In 4 further details of the embodiment of the rolling machine 1 with a vacuum connection 21 for realizing the vacuum connection are shown. The rolling machine 1 has a vacuum source 18 which is connected to the vacuum connection 21 via a vacuum line 19 . The vacuum connection 21 is connected to the vacuum channel 17 . Vacuum is generated via the vacuum source 18, the vacuum line 19, the vacuum connection 21 and the vacuum channel 17 in such a way that the desired connection between the base body 6 and the profile part 7 of the rolling tool 5 is achieved.

In figure 5 12 is a view of the reeling machine 1 according to FIG 1 shown from the right, so that the workpiece 2 designed as a screw 3 and the profiling sections 9 can be seen better. It is doing but compared to 1 a connection technique is shown. Furthermore, a later position in the rolling process is shown in order to be able to show the formation of the thread 10 of the screw 3 . The thread 10 was shown in a simplified manner, in that the pitch typical of a thread was not taken into account in the drawing. It goes without saying, however, that it is a conventional thread with a pitch. Concerning the coincident aspects of the representation of 2 as well as the following figures, in order to avoid repetition, reference is made to the description given above 1 referred.

In the present example, each of the rolling tools 5 has a connecting means designed as a magnet holder 24 . The magnet holder 24 has a plurality of magnets 25 which are corresponding recesses are arranged in the base body 6. The desired floating mounting between the base body 6 and the associated profile part 7 is achieved by the magnets 25 . The base body 6 can either be designed as part of the rolling machine 1 in the sense of an integration into it or as an additional part to the rolling machine 1 .

In 6 a further exemplary embodiment of the rolling tool 5 of the rolling machine 1 is shown. In this case, the connection between the base body 6 and the profile part 7 is again realized by the magnet holder 24 . However, these are supplemented by springs 31 embodied here as disc springs 32 . These are attached to the base body 6, in particular by screw connections. However, other suitable springs 31 could also be involved. This achieves the desired play, so that the profile part 7 can move relative to the base body 6 in the plane perpendicular to the rolling direction 23 .

In 7 a further exemplary embodiment of the rolling tool 5 of the rolling machine 1 is shown. In this case, the connection between the base body 6 and the profile part 7 is realized by two form-fitting connecting elements 29 . This is a tongue and groove connection 30 with a game 33 (shown exaggeratedly large) between the groove and the tongue. This creates a loose fit, so that the profile part 7 can move in the plane perpendicular to the rolling direction 23 along the movement axis Z relative to the base body 6 . The profile part 7 is held on the base body 6 by means of the springs 31 .

In the 8 , 9 and 10 Various relative positions between the rolling tools 5 of a pair of rolling tools 5 are shown in schematic views in order to explain in more detail the self-adjustment achieved by the floating bearing. In the example shown, only the profile part 7 shown on the right is floating and thus performs the alignment. However, it is also possible for both profile parts 7 to be mounted in a floating manner and for the alignment to be carried out together. The force components produced during the rolling process are represented by arrows in the figures. If the profile parts 7 are correctly aligned with one another, only the horizontal force 26 occurs.

In 8 it can be seen that there is a deviation between the thread 10 and the profiling section 9 (see dashed line) of the profile part 7 shown on the right. This deviation relates to the movement axis Z. In addition to the horizontal force 26, the track error force 27 directed upwards is present, so that the resultant force directed obliquely upwards 28 results. If the rolling process continued with this relative orientation, the thread 10 of the screw 3 would not be correctly formed.

In 9 the other type of tracking error is shown. In this case, the tracking error force 27 is directed downwards. Due to the horizontal force 26 and this track error force 27, the resultant force 28 is directed obliquely downwards. Even with this alignment, the thread 10 does not form correctly.

In 10 but now the position of the profile parts 7 of the pair of rolling tools 5 is shown, which results automatically due to the floating mounting of the profile part 7 shown on the right. In the course of the rolling process, the profile parts 7 of the pair of rolling tools 5 are automatically aligned with one another. This is due to the translational degree of freedom provided by the floating bearing in the 9 shown plane along the movement axis Z possible. This movement axis Z runs perpendicularly to the rolling direction 23. Thus, there is no longer any track error, so that the horizontal force 26 corresponds to the resultant force 28 at the same time and the thread 10 is formed correctly.

In 11 Another exemplary embodiment of a pair of rolling tools 5 is shown. In this case, the rolling tools 5 are not designed as cuboid or plate-shaped rolling dies, but as cylindrical rollers. With these roles, the thread 10 of the screw 3 is produced here again by way of example. For the presentation of the thread 10, reference is made to the statements given above 2 referenced. In this example, the connecting portions 11, 12 are cylindrical surfaces which are connected to each other in a suitable manner. The movable connection is not further shown in this drawing. In this regard, however, reference is made to the explanations given above.

the 12 and 13 show one of the rolling tools 5 8 in two different views. The cylindrical design of the connecting sections 11 and 12 can be seen in particular here.

14 . shows a schematic plan view of a further exemplary embodiment of the new rolling tools 5. In this case, they have a motion drive 34. The movement drive 34 has a motor 35, a motor controller 36, a movement sensor unit 37 and a coupling element 38 on. The movement drive 34 serves to motor-assist the relative movement between the profile part 7 and the base body 6 . The coupling element 38 is operatively connected to the profile part 7 . The motor 35 drives the coupling element 38 back and forth in translation or rotation. This movement is transmitted to the profile part 7 by the coupling element 38 and thus causes the desired translational movement of the profile part 7 relative to the base body 6.

The motion drive 34 has a motion sensor unit 37 . The movement sensor unit 37 detects a relative movement between the profile part 7 and the base body 6 that automatically results from the rolling process and amplifies it. As soon as the tracking error force is no longer present or falls below a limit value, the motor 35 is switched off. When the tracking error force changes direction, the direction of rotation of the motor 35 is reversed.

15 shows schematically the connection between the coupling element 38 and the profile part 7 of the rolling tool 5 according to FIG 14 .

16 shows a perspective view of an exemplary embodiment of the new rolling tools 5 to explain the geometric relationships. The left rolling tool 5 is movable and the right rolling tool 5 is stationary. It is easy to see how the movement axis Z runs relative to the rolling tool 5 and the workpiece 2 designed as a screw 3 .

REFERENCE LIST

1

rolling machine

2

workpiece

3

screw

4

recording

5

rolling tool

6

body

7

profile part

8th

radial direction

9

profiling section

10

thread

11

connection section

12

connection section

13

Arrow

17

vacuum channel

18

vacuum source

19

vacuum line

20

attachment section

21

vacuum connection

22

lanyard

23

rolling direction

24

magnet holder

25

magnet

26

horizontal force

27

tracking error force

28

resulting power

29

positive connection element

30

tongue and groove connection

31

Feather

32

disc spring

33

Game

34

motion drive

35

engine

36

engine control

37

motion sensor unit

38

coupling element

Claims (13)

1. Rolling tool (5), with

   a base body (6) for fastening the rolling tool (5) in a rolling machine (1),
   and

   a profile part (7) for shaping a workpiece (2) to be rolled,

   wherein the base body (6) and the profile part (7) are constructed in several pieces and are connectable to one another and separable from one another in a non-destructive manner, characterised in that

   the base body (6) and the profile part (7), in their interconnected position, are mounted movably relative to one another in a plane perpendicular to the rolling direction (23) while exclusively overcoming static friction between them are mounted so as to be movable relative to one another.
2. Rolling tool (5) according to claim 1, characterised in that the extent of movement along only one axis in the plane perpendicular to the rolling direction (23) is at least 0.1 mm, in particular between 0.1 mm and 0.3 mm, in particular between 0.1 mm and 0.2 mm, in particular about 0.1 mm.
3. Rolling tool (5) according to claim 1 or 2, characterised in that the profile part (7) is formed as a thread rolling part with a pitch and the extent of movement along only one axis in the plane perpendicular to the rolling direction (23) is at least 5%, in particular at least 8%, in particular at least 10%, in particular between 5% and 15%, in particular about 10%, of the pitch.
4. Rolling tool (5) according to one of the preceding claims, characterised in that the base body (6) and the profile part (7) are mounted in their mutually connected position in the plane perpendicular to the rolling direction (23) so as to be movable relative to one another along only one axis, namely an axis of movement (Z).
5. Rolling tool (5) according to claim 4, characterised in that the profile part (7) has a length (L) and a width (B), the rolling direction (23) running parallel to the length (L) of the profile part (7) and the axis of movement (Z) running parallel to the width of the profile part (7).
6. Rolling tool (5) according to claim 4 or 5, characterised in that the axis of movement (Z) corresponds to the longitudinal axis of a workpiece (2) to be rolled which is received in the rolling tool (5) during use.
7. Rolling tool (5) according to one of the preceding claims, characterised in that the base body (6) and the profile part (7) are movably connected to one another in such a way that, after a relative movement, they are not urged back into an initial position by a return means, e.g. a spring.
8. Rolling tool (5) according to one of the preceding claims, characterised in that the base body (6) and the profile part (7) are designed to be connectable to one another in the operating position of the rolling tool (5) in the rolling machine (1) by negative pressure, magnetism and/or spring force.
9. Rolling tool (5) according to at least one of the preceding claims, characterised in that the profile part (7) has a smaller thickness than the base body (6) and/or a thickness of 10 mm or less.
10. Rolling tool (5) according to at least one of the preceding claims, characterised in that the maximum thickness of the profile part (7), i.e. the thickness at the thickest point of the profile part (7), is between 4 mm and 10 mm, in particular between 4 mm and 8 mm.
11. Rolling tool (5) according to at least one of the preceding claims, characterised in that the profile part (7) is arranged on the base body (6) as seen in the radial direction (8) of the workpiece (2) to be rolled, and/or the profile part (7) has a profiling section (9) for shaping the workpiece (2) to be rolled and a connecting section (11) for connecting to the base body (6), and/or the base body (6) has no profiling section for shaping the workpiece (2) to be rolled, but has a fastening section (20) for fastening in a rolling machine (1) and a connecting section (12) for connecting to the profile part (7), and/or the rolling tool (5) is designed as a rolling die.
12. Rolling machine (1) with a rolling tool (5) according to at least one of the preceding claims.
13. Rolling machine (1), having a rolling tool (5) with a base body (6) for fastening the rolling tool (5) in the rolling machine (1) and a profile part (7) for the shaping processing of a workpiece (2) to be rolled, the base body (6) and the profile part (7) being designed in several pieces and being connectable to one another and separable from one another in a non-destructive manner, characterized in that

    a vacuum connection (21) which is designed and arranged in such a way that the profile part (7) can be connected to the base body (6) by means of a vacuum and can be separated from the latter in a non-destructive manner, and the base body (6) and the profile part (7) are mounted so as to be movable relative to one another in their interconnected position in a plane perpendicular to the rolling direction (23), or

    a plurality of magnets (25) which are arranged in recesses in the base body (6) in such a way that the profile part (7) can be connected to the base body (6) by means of magnetism and can be separated from the latter in a non-destructive manner, and the base body (6) and the profile part (7), in their connected position, are mounted so as to be movable relative to one another in a plane perpendicular to the rolling direction (23).

Images