EP3738691A2 - Multi-piece rolling tool with floating support and rolling machine - Google Patents

Abstract

Profile part (7) for a rolling tool (5), with a profiling section (9) for shaping a workpiece (2) to be rolled, and a connecting section (11) for connecting to a separate base body (6) of the rolling tool (5), thereby characterized in that the maximum thickness of the profile part (7), d. H. 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.

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 the shaping processing of a workpiece to be rolled.

Such rolling tools are used to produce certain outer contours of rotationally symmetrical components. The outer contours produced in this way are, in particular, threaded sections and other profiles, such as, for example, helix. 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 usually takes place by forming and in particular by cold extrusion. The subsequent shaping processing is carried out by forming and in particular by cold forming.

STATE OF THE ART

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 from the US patent U.S. 1,524,327 known. The base body and the profile part are constructed 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 positively but with play, guided in two grooves in the receptacle of the rolling machine for the base body. Undercuts forming the grooves. As a result, the entire rolling tool is movably supported relative to the rolling machine in a plane perpendicular to the rolling direction.

A 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 from the United States patent US 1,979,919 known. The entire rolling tool is held in a defined position on an associated receptacle of the rolling machine by means of two oppositely acting springs. The rolling tool can move to a limited extent against the spring forces. The rolling tool is permanently pushed back into its starting 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 from the German patent application DE 102 12 256 A1 known. The base body and the profile part are constructed in several pieces. The profile part has a strongly changing thickness. A plurality of screw connections are provided for connecting the part. In this case, screws are screwed into threaded holes in the profile part through through-holes in the base body.

Another 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 from the German patent application DE 195 20 699 A1 known. 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 the base body and the profiling section are functionally created.

Another 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 from the German patent application DE 10 2004 056 921 A1 known. The protruding and recessed areas of the profiling section that form the geometry of the profile part were incorporated into a block-like blank, so that the base body and the profile part functionally arise.

Another 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 from the German patent DE 10 2004 014 255 B3 known. The tracking error force which is present due to an undesired offset between the rolling tools of the pair of rolling tools is measured by means of a sensor. The sensor signal then enters a control loop as a controlled variable. Depending on the sensor signal, the alignment between the rolling tools is changed, one of which is fixed and one of which is movable.

Further 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 known.

A punching machine with a movable punching plate and a method for releasably fastening a punching counterplate by means of negative pressure are from the German patent application DE 36 20 853 A1 known.

OBJECT OF THE INVENTION

The invention is based on the object of substantially reducing the costs arising in the course of reconditioning 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 claims.

Further preferred embodiments according to the invention can be found in the dependent 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 the shaping processing of a workpiece to be rolled. The base body and the profile part are constructed in several pieces and can be connected to one another and separated from one another without being destroyed. In their interconnected position, the base body and the profile part are movably supported relative to one another in a plane perpendicular to the rolling direction.

The invention further relates to a profile part for a rolling tool with a profiling section for the shaping machining of a workpiece to be rolled. The profile part has a connecting section for connecting to a separate base body of the rolling tool. The base body has a fastening section for fastening in a rolling machine and a connecting section for connecting to the profile part, the profile part not having a fastening section for fastening in the rolling machine. In their interconnected position, the two connecting sections are mounted so as to be movable relative to one another in a plane perpendicular to the rolling direction.

The invention also relates to a profile part according to claim 12.

The invention further relates to a rolling machine according to claim 14 and a rolling machine according to claim 15.

For the desired shaping processing of the workpiece to be rolled, this is brought into contact with a pair of rolling tools. When a rolling tool is mentioned in this application, this designates one of these rolling tools 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 jaw is attached to a movable receptacle - in particular a slide - of the rolling machine. It usually has a greater length and is guided past the stationary roll jaw at a defined distance - the so-called roll gap. The workpiece to be rolled is brought into this roll gap. The rolling jaws each have the profiling section on their side surface facing the workpiece.

The movable mounting between the base body and the profile part represents a floating mounting. The floating mounting is implemented in particular on the stationary rolling jaw. However, it can also be implemented additionally or alternatively on the movable roller jaw. In particular, it is only present on one rolling jaw. The same applies to other types of rolling tools, in particular rollers, rings or ring segments. Even if the floating mounting is only implemented on one rolling jaw or another rolling tool, the other rolling jaw 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.

With the new at least two-part rolling tool with a floating bearing between the base body and the profile part, the rolling process is optimized in several ways. The optimization concerns both the costs arising 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 in the course of the entire rolling process.

As for example in the German patent mentioned above DE 10 2004 014 255 B3 is described in detail, if the profiling sections of the rolling tools of the pair of rolling tools are incorrectly aligned with one another, an undesired tracking error force occurs. This tracking error force is now used according to the invention to use the translational degree of freedom provided by the floating mounting for the corrective self-alignment of the rolling tools.

By enabling a relative movement between the base body and the profile part in their interconnected position in a plane perpendicular to the rolling direction, they can use the tracking error force present during rolling to align themselves relative to one another 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 movable storage, storage with a translational degree of freedom, storage with an intentional game or floating storage does not affect the plane in which the rolling direction is located. The rolling forces must 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 this one in Fig. 6 , 7th and 8th is shown. This storage is used 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 achieve the ideal relative position or at least approach it. This is achieved automatically by enabling the relative movement, since the rolling forces are lowest in this ideal position and the profile part therefore automatically assumes this when it has the appropriate mobility.

In their interconnected position in the plane perpendicular to the rolling direction, the base body and the profile part are preferably mounted movably 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 running parallel to the length L of the profile part and the axis of movement Z running parallel to the width of the profile part. Strictly speaking, the rolling direction is the rolling direction, since the rolling direction not only indicates a position in space, but is also directed. The floating mounting is instead about mobility in two opposite senses along an 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 accommodated in the rolling tool 5. If the workpiece is such. B. is a screw, so the axis of movement Z corresponds to the screw's longitudinal axis.

In their interconnected 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 while only overcoming the static friction between them. This means in particular that the base body and the profile part are movably connected to one another in such a way that, after a relative movement, they are not affected by a return means, e.g. B. a spring are urged back into an initial position. Instead, they can freely assume and maintain their ideal position relative to one another.

Before rolling the first workpiece, 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.

Then the first workpiece is 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 operating point was too great, the first workpiece is rejected.

With the following workpieces, the rolling process starts from the working point. So there is no return to a starting position. Due to the still existing mobility along the movement axis Z (that is to say back and forth), however, the rolling tool can continue to adapt to the geometrical conditions that change somewhat 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 particularly facilitated by the fact that the profile part has a low mass and therefore also a low mass inertia due to its small thickness. Furthermore, the holding forces applied can be small, so that overall only a small force has to be applied to overcome the static friction.

This movable or floating mounting is therefore not to be understood as a mounting that does not achieve the desired fixed mounting only because of unavoidable tolerances or other unwanted errors. In order to numerically delimit the invention from such random degrees of freedom, the extent of the 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 translational degree of freedom, there is no stop within the area required for the movement. For the correct placement of the profile part on the base body, however, a stop can be provided which lies outside this area required for self-alignment. However, this stop has no function during the rolling process.

The holding force between the base body and the profile part provided by the connecting means can be designed to be adjustable. This holding force can also or alternatively be designed to be deactivatable in order to allow a simple change of a worn profile part or a profile part to be replaced for other reasons.

Due to the separate manufacture and multi-piece design of the rolling tool in terms of a structural division into the base body and the profile part, many advantages are achieved. Surprisingly, these also include a substantial cost reduction in the context of the maintenance of the rolling tool.

Like other tools, rolling tools are subject to a certain amount of wear and tear. In the case of roller tools, this wear occurs in the area of their profiled surface for shaping the workpiece. If this profiling section is so worn that it is no longer possible to properly process the workpieces to be rolled, restorative post-processing must be carried out. Since the user of the rolling tool is usually not technically capable of doing this, the rolling tool is sent back to the rolling tool manufacturer by post or shipping company. Since a rolling tool has a considerable mass which, depending on the size, can for example be between about 0.5 and 50 kg, this sending of the rolling tool back and forth results in considerable freight costs.

According to the invention, this problem is now solved or substantially reduced by dividing the rolling tool into two parts, namely a base body and a profile part, and treating these parts differently. Since the base body is normally not subject to any wear 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 profile part are made up of several pieces also means that they can be formed from different materials and / or can be subjected to different machining processes. For example, it is possible to manufacture the base body from a comparatively less high-quality and therefore more cost-effective material. The base body can for example consist of structural steel. The profile part preferably consists of a higher quality, harder and more wear-resistant material. It can be, for. B. to be hard metal or high speed steel (HSS).

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

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

The profile part can be designed as a thread rolling part with a pitch and the extent of the mobility along only one axis, namely the movement axis, in the plane perpendicular to the rolling direction 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 generated and a faulty thread is rolled.

In the operating position of the rolling mechanism in the rolling machine, the base body and the profile part can be designed such that they can be connected to one another by negative pressure, magnetism or spring force. With these force-fit connection techniques, the desired floating mounting is achieved 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 of 10 mm or less. The mass of the profile part to be sent for maintenance or to be completely replaced is thus 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 profiling section is either partially or completely removed and a new, intact profiling section is introduced. Understandably, this results in a decrease in the height of the profile part. The starting height of a new profile part is therefore preferably chosen so that the thickness of the profile part is still sufficient for the correct function of the rolling tool after the desired number maintenance measures have been carried out. 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 security without being deformed or even breaking.

But it is also possible that a worn profile part is not restored, but replaced by 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 brought into this roll gap. When the rolling tools are repaired, the thickness of the rolling tool decreases, so that the roll gap changes and has to be readjusted. So if a worn profile part is not restored but replaced by a new profile part, the set-up effort in terms of setting the roll gap is only incurred once.

The thickness of the profile part can be a maximum of about half as great as the thickness of the base body. This ensures 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. In the case of 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 understood to mean the thickness at its thickest point. The profile part often has an approximately constant thickness over its length and width, so that this simultaneously corresponds to the maximum thickness. 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 FIG DE 102 12 256 A1 is the case), this is the area of its greatest thickness. By reducing the thickness of the profile part at its thickest point, the desired material saving results.

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 context of the repair of a worn rolling tool.

The profile part can be arranged on the base body, viewed in the radial direction of the workpiece to be rolled. 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. In this case, the base body cannot have a profiling section for shaping the workpiece to be rolled, but a fastening section for fastening in a rolling machine and a connecting section for connecting to the profile part. The separation of the base body and the profile part takes place in such a way that the shaping function is assigned solely to the profile part and the fastening function in terms of fastening in the rolling machine is assigned to the base body alone.

The profiling section has a profile depth. The thickness of the profile part can, depending on the planned maintenance measure, be a multiple of the profile depth of the profiling section of the profile part. In particular, it is about twice as large as the profile depth. As a rule, a profile depth is processed with a maintenance measure.

In the operating position of the rolling tool in a rolling machine, the base body and the profile part can be designed such that they can be connected to one another by negative pressure. Such a vacuum connection ensures the non-destructive separation of the two parts in a particularly simple manner. The connection of the base body and the profile part does not require any special tools. 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 such that they can be connected to one another by magnetism or spring force. It is also possible to combine these types of connection with one another or with the vacuum connection described above.

The rolling tool can be designed as a rolling jaw. Rolling dies are the cuboid, relatively flat rolling tools described above (see e.g. Fig. 7 of the German patent application DE 10 2004 056 921 A1 of 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 circular segment. At least the connecting section of the base body is then also designed in the shape of a circular ring.

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

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

A movement drive can be assigned to the rolling tool. The motion drive is used to support the relative movement between the profile part and the base body by a 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 back and forth translationally or rotationally. These Movement is transmitted to the profile part by the coupling element and thus causes 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 a relative movement between the profile part and the base body that results automatically from the rolling process and amplifies this. As soon as the tracking error force is no longer present or falls below a limit value, the motor is switched off. If the tracking error force changes its direction, the direction of rotation of the motor is reversed.

The invention relates not only to a complete rolling tool with a base body and a profile part, but also to a separate profile part for a multi-piece rolling tool. This profile part with the profiling section is then connected via its connecting section to a corresponding connecting section of the base body of the rolling tool. In particular, it is possible that a worn profile part is not restored, but replaced by a new profile part. In this case, the manufacturer of the rolling tool either delivers no base body at all or only the base body that remains with the user during the first delivery of the rolling tool. Then only new profile parts are delivered to the user of the rolling tool.

Another aspect of the invention relates to a new rolling machine that already includes the base body of the rolling tool. In this case, the base body can already be supplied by the manufacturer of the rolling machine, so that the manufacturer of the rolling tool only supplies the profile part. This can in turn either be repaired or replaced after a certain amount of wear has occurred.

Another aspect of the invention relates to a new rolling machine with a vacuum connection, magnets or a spring for achieving the fixed connection between the base body and the profile part of the new multi-piece rolling tool.

Advantageous further developments of the invention emerge from the patent claims, the description and the drawings. The advantages of features and of combinations of several features mentioned in the description are merely exemplary and can come into effect alternatively or cumulatively, without the advantages necessarily being dependent on the invention Embodiments must be achieved. Without changing the subject matter of the attached claims, the following applies to the disclosure content of the original application documents and the patent: Further features can be found in the drawings - in particular the illustrated geometries and the relative dimensions of several components to one another and their relative arrangement and operative connection. The combination of features of different embodiments of the invention or of features of different patent claims is also possible, deviating from the selected back-references of the patent claims, and is hereby suggested. This also applies to features that are shown in separate drawings or mentioned in their description. These features can also be combined with features of different patent claims. Features listed in the claims for further embodiments of the invention can also be omitted.

The number of features mentioned in the claims and the description are to be understood in such a way that precisely this number or a greater number than the stated number is present without the need for the explicit use of the adverb "at least". So if, for example, a profile part is mentioned, this is to be understood in such a way that exactly one profile part, two profile parts or more profile parts are present. These characteristics can be supplemented by other characteristics or be the only characteristics that make up the product in question.

The reference signs contained in the claims do not represent a restriction of the scope of the subject matter protected by the claims. They only serve the purpose of making the claims easier to understand.

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 Nut-Feder-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.

In the following, the invention is further explained and described with reference to preferred exemplary embodiments shown in the figures.

Fig. 1

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

Fig. 2

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

Fig. 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.

Fig. 4

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

Fig. 5

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

Fig. 6

shows a schematic view of a pair of a further exemplary embodiment of the new rolling tool with magnetic holders and springs.

Fig. 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.

Fig. 8

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

Fig. 9

FIG. 13 shows a schematic view of the pair of rolling tools according to FIG Fig. 8 with a second tracking error.

Fig. 10

FIG. 13 shows a schematic view of a pair of rolling tools according to FIG Fig. 8 in the aligned position without tracking errors.

Fig. 11

Figure 12 shows a sectional view of another exemplary embodiment of the new rolling tools.

Fig. 12

shows one of the rolling tools Fig. 11 .

Fig. 13

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

Fig. 14

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

Fig. 15

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

Fig. 16

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

FIGURE DESCRIPTION

Fig. 1 shows a schematic side view of a first exemplary embodiment, shown only in parts, of a new rolling machine 1 for shaping a workpiece 2 to be rolled. In the present example, the workpiece 2 is a screw 3. It could, however, also be a different one by rolling act workpiece 2 to be machined.

The rolling machine 1 has two receptacles 4, each of which is used for fastening 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 jaws. But 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 receptacle 4 of the rolling machine 1. The rolling tool 5 also has a profile part 7 for the shaping machining of the workpiece 2 to be rolled. The base body 6 and the profile part 7 were produced as separate elements - that is, they are designed in several pieces - and were then connected to one another to form the rolling tool 5. In this way, the base body 6 and the profile part 7 can be connected to one another and separated from one another without being destroyed.

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.

The profile part 7 has a profiling section 9 for the shaping processing of the workpiece 2 to be rolled. The profiling section 9 has a profiled external geometry with protruding areas and recessed areas which correspond to the desired external 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 serve to roll a different outer contour.

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

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 connection technology (not shown). These are negative pressure, magnetism, form fit 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 Fig. 1 is represented symbolically by means of the arrow 13, in this case the upper roller tool 5 is stationary and the lower roller tool 5 is arranged and driven so as to be movable in the direction of the arrow 13. The arrow 13 corresponds to the rolling direction 23 (more precisely the rolling direction sense). When the lower rolling tool 5 moves in the direction of the arrow 13, the blank of the workpiece 2 is received between the profiling sections 9 and reshaped accordingly. This type of deformation is known per se in the prior art and is therefore not described further in the following.

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

The outer geometry of the profiling section 9 is in Fig. 2 good to see. It can also be seen that the connecting sections 11, 12 are each designed as flat surfaces.

In Fig. 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 implemented via negative pressure which is present via the negative pressure channels 17.

In Fig. 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 negative pressure source 18 which is connected to the negative pressure connection 21 via a negative pressure line 19. The vacuum connection 21 is connected to the vacuum channel 17. Negative pressure is generated via the negative pressure source 18, the negative pressure line 19, the negative pressure connection 21 and the negative pressure channel 17 so that the desired connection between the base body 6 and the profile part 7 of the rolling tool 5 is achieved.

In Fig. 5 FIG. 3 is a view of the rolling machine 1 according to FIG 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 compared to that though Fig. 1 a connection technique shown. Furthermore, a position later 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 has been shown in a simplified manner in that the pitch typical for a thread has not been taken into account in the drawing. It goes without saying, however, that it is a common thread with a pitch. Regarding the consistent aspects of the presentation of Fig. 2 as well as the following figures, the description given above is used to avoid repetition Fig. 1 referenced.

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 in 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 being integrated into it or as an additional part to the rolling machine 1.

In Fig. 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. These are, however, supplemented by springs 31, which are designed here as disc springs 32. These are attached to the base body 6, in particular by screw connections. However, it could also be other suitable springs 31. The desired play is thereby achieved, so that the profile part 7 can move in the plane perpendicular to the rolling direction 23 relative to the base body 6.

In Fig. 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 play 33 (shown in exaggerated size) between the tongue and groove. This creates a clearance 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 Fig. 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 the self-adjustment achieved by the floating mounting in more detail. In the example shown, only the profile part 7 shown on the right is floating and thus carries out the alignment. However, it is also possible for both profile parts 7 to be mounted in a floating manner and to carry out the alignment together. In the figures, the force components arising during the rolling process are shown by arrows. If the profile parts 7 are correctly aligned with one another, only the horizontal force 26 occurs.

In Fig. 8 it can be seen that there is a discrepancy 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 axis of movement Z. In addition to the horizontal force 26, the upwardly directed tracking error force 27 is present, so that the resultant force directed obliquely upward 28 results. If the rolling process were to be continued with this relative orientation, the thread 10 of the screw 3 would not be formed correctly.

In Fig. 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 tracking error force 27, the resultant force 28 directed obliquely downward thus results. Even with this alignment, the thread 10 does not form correctly.

In Fig. 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 mounting in the Fig. 9 shown plane along the movement axis Z possible. This axis of movement Z runs perpendicular to the rolling direction 23. Thus, there is no longer any tracking error, so that the horizontal force 26 at the same time corresponds to the resulting force 28 and the thread 10 is correctly formed.

In Fig. 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 rather as cylindrical rollers. The thread 10 of the screw 3 is again produced here by way of example with these rollers. To illustrate the thread 10, refer to the explanations given above Fig. 2 Referenced. In this example, the connecting sections 11, 12 are cylindrical surfaces which are connected to one another in a suitable manner. The movable connection is not shown in this drawing. In this regard, however, reference is made accordingly to the statements made above.

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

Fig. 14 . shows a schematic top view of a further exemplary embodiment of the new rolling tools 5. In this case, these have a movement drive 34. The movement drive 34 has a motor 35, a motor control 36, a movement sensor unit 37 and a coupling element 38. The movement drive 34 serves to support the relative movement between the profile part 7 and the base body 6 by a motor. The coupling element 38 is operatively connected to the profile part 7. The motor 35 drives the coupling element 38 back and forth translationally or rotationally. This movement is transmitted to the profile part 7 by the coupling element 38 and thus brings about the desired translational movement of the profile part 7 relative to the base body 6.

The movement drive 34 has a movement sensor unit 37. The movement sensor unit 37 detects a relative movement between the profile part 7 and the base body 6 that results automatically 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. If the tracking error force changes its direction, the direction of rotation of the motor 35 is reversed.

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

Fig. 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 can be clearly seen how the axis of movement 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

4th

admission

5

Rolling tool

6

Base body

7th

Profile part

8th

radial direction

9

Profiling section

10

thread

11

Connection section

12

Connection section

13th

arrow

17th

Vacuum duct

18th

Vacuum source

19th

Vacuum line

20th

Fastening section

21st

Vacuum connection

22nd

Lanyard

23

Rolling direction

24

Magnet holder

25th

magnet

26th

horizontal force

27

Tracking error force

28

resulting power

29

form-fitting connecting element

30th

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 (15)

Profile part (7) for a rolling tool (5), with
a profiling section (9) for the shaping machining of a workpiece (2) to be rolled, and
a connecting section (11) for connecting to a separate base body (6) of the rolling tool (5), characterized in that the maximum thickness of the profile part (7), ie the thickness at the thickest point of the profile part (7), between 4 mm and 10 mm, in particular between 4 mm and 8 mm. Profile part (7) according to claim 1, characterized in that the profile part (7) is designed as a thread rolling part with a pitch, and / or wherein the profile part (7) has a length (L) and a width (B), one rolling direction (23) runs parallel to the length (L) of the profile part (7) and a movement axis (Z) parallel to the width of the profile part (7). Profile part (7) according to claim 1 to 2, characterized in that the profile part (7) has features of at least one of the following claims. 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 the shaping processing of a workpiece (2) to be rolled, the base body (6) and the profile part (7) being in several pieces and are designed to be connectable and non-destructively separable from one another, characterized in that
the base body (6) and the profile part (7) are mounted in their interconnected position in a plane perpendicular to the rolling direction (23) so as to be movable relative to one another while only overcoming the static friction between them. Rolling tool (5) according to claim 4, characterized in that the extent of mobility 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. Rolling tool (5) according to claim 4 or 5, characterized in that the profile part (7) is designed as a thread rolling part with a pitch and the extent of mobility 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 gradient. Rolling tool (5) according to at least one of the preceding claims, characterized in that the base body (6) and the profile part (7) in their interconnected position in the plane perpendicular to the rolling direction (23) along only one axis, namely one axis of movement (Z ), are mounted movably relative to one another, in particular the profile part (7) has a length (L) and a width (B), the rolling direction (23) parallel to the length (L) of the profile part (7) and the axis of movement (Z ) runs parallel to the width of the profile part (7). Rolling tool (5) according to Claim 7, characterized in that the axis of movement (Z) corresponds to the longitudinal axis of a workpiece (2) to be rolled and accommodated in the rolling tool (5). Rolling tool (5) according to at least one of the preceding claims, characterized 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 affected by a return means, e.g. B. a spring are urged back into an initial position. Rolling tool (5) according to at least one of the preceding claims, characterized in that the base body (6) and the profile part (7) can be connected 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 are trained. Rolling tool (5) according to at least one of the preceding claims, characterized in that the profile part (7) has a smaller thickness than the base body (6) and / or of 10 mm or less. Rolling tool (5) according to at least one of the preceding claims, characterized in that the maximum thickness of the profile part (7), ie the thickness at the thickest point of the profile part (7), between 4 mm and 10 mm, in particular between 4 mm and 8 mm. Rolling tool (5) according to at least one of the preceding claims, characterized in that
the profile part (7) is arranged on the base body (6) viewed 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) does not have a profiling section for shaping the workpiece (2) to be rolled, but 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 jaw. Rolling machine (1) with a rolling tool (5) according to one of the preceding claims 4 to 13 and / or a profile part (7) according to at least one of the preceding claims 1 to 3. Rolling machine (1), with
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 shaping a workpiece (2) to be rolled, the base body (6) and the profile part (7) are constructed in several pieces and can be connected to one another and separated from one another non-destructively, characterized by a negative pressure 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 negative pressure and can be separated from it without destruction and the base body (6) and the profile part (7) are mounted movably 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 thus positioned in recesses in the base body (6 ) are arranged so that the profile part (7) can be connected to the base body (6) by means of magnetism and can be separated from it in a non-destructive manner, and the base body (6) and the Profile part (7) are mounted movably relative to one another in their interconnected position in a plane perpendicular to the rolling direction (23).

Images