EP2165785B1 - Method and device for manufacturing longitudinal grooves in cylindrical workpieces - Google Patents

Abstract

The device has a roller stamp (7) arranged at a lower end of an upper stamp (9), and carrying a cylindrical component (11). Multiple profile disks (4) are arranged opposite to a housing (25) for implementing shifting movement of the component in a radially inward direction. A movement guide is rotatably mounted on a housing-firm bearing shell (3). The disks are movably driven by piston rods (1, 2) that are arranged at a distance from each other. One of ends of the piston rods is held in a recess in the profile disk and other end of the rod is rotatably mounted over a bearing axis on the shell. An independent claim is also included for a method for producing longitudinal slots in a cylindrical workpiece.

Description

The invention relates to an apparatus and a method for producing longitudinal grooves in cylindrical workpieces.

In the manufacture of profile bodies, such as disc carriers of clutches, toothed belt pulleys or similar workpieces with a cylindrical basic structure, high accuracies and precision are often required. In particular, it depends on the accuracy of the concentricity and the surface quality.

The workpieces described are high-quality production parts, which are produced in large quantities. Thus, in addition to the qualitative characteristics, the costs and the output are important criteria in a production plant for such workpieces.

For the production of the workpieces described above discloses the generic DE 10 2006 025 034 A1 a suitable method. A special rolling tool makes it possible to produce the workpiece from a blank having a smooth outer contour by means of a press, wherein each press stroke forms a workpiece from a blank.

With each press stroke, a rolling process takes place in which the profile rollers press the desired outer profile into the lateral surface of the workpiece. The profile rollers are arranged in a lower tool along the circumference of the workpiece to be machined. If the workpiece is pressed between the rollers by means of an upper tool fastened to the plunger of the press, these are supported on support rollers with appropriate mounting.

The lower tool can be constructed rotationally symmetrical, wherein the profile of the workpiece generating individual profile rollers are regularly distributed at a uniform angle to each other along the circumference of the workpiece. As a result, and as a result of the resulting rotationally symmetric distribution of forces during a forming process, the individual, of the respective grooves produced grooves profile each other virtually the same. In particular, a paragraph-free contour is achieved.

In the mentioned DE 10 2006 025 034 A1 an upper punch is arranged in a tool upper part, at the lower end of a roll punch is arranged, which carries the component to be deformed. Opposite the housing in this case opposite segment discs are arranged, which are rotatably mounted in housing-fixed bearing shells.

In the subject of said DE 10 2006 025 034 A1 the storage of the oppositely arranged segment discs each consist of a circle segment, wherein the segment disc are rotatably mounted in a single housing-fixed axis of rotation and roll on a circular rolling track on the outer circumference of the component to be deformed.

This has the disadvantage that only continuous, continuous and uniform motion curves are possible on the component to be machined. Deviations from the circular trajectory are not possible and provided.

For example, it is not possible to influence by penetration in the region of the circular path penetration of the profile disc into the component in any way in the direction of a "soft penetration". Furthermore, it is not possible for circular movement paths to influence the lift-off movement of the profile discs after completion of the pressure deformation at the contact point between profiled disc and component to be deformed in the sense of a fast lift-off movement in order to prevent jamming of the component on the profile disc.

The invention is therefore based on the object of further developing a method and a device of the shape that the profiled disks used can be driven on different motion curves, which are not necessarily on a circular path.

To solve the problem, the invention is characterized by the technical teaching of claim 1.

An essential feature of the invention is that in each case a profiled disc is movably driven by at least two spaced-apart connecting rods, wherein each one end of the connecting rod is held in a receptacle in the profiled disc and the respective other end of the connecting rod via a respective bearing axis in a housing Bearing shell is rotatably mounted.

With the connecting rod drive of the profile discs, there is now the significant advantage that the respective profile disc is no longer associated with any circular movements, but rather a sequence of movements deviating from the circular path. This can z. B. soft immersion of the profile disc tool can be achieved in the surface of the component to be deformed and also can be achieved here that when notching or when removing the profile disc of the component takes a quick lift-off, without the risk that the component clamped to the profile disc.

This results in an optimized sequence of movements, which was previously not achievable in circular trajectories.

Due to the two spaced-apart bearing axes of the two connecting rods thus results in a double bearing of the profiled disc and because of this double storage results in much shorter rolling movements of the profiled disc, because this is accommodated in two spaced axes of rotation.

This is in contrast to a purely on a circular path moving profile disc, because it rotates about a single center of rotation and thus larger turning paths are required.

The present invention is not limited to the arrangement of two spaced-apart connecting rods. It is also possible instead of two To use connecting rods of their three or more to achieve even better storage of the profile disc.

In a further development of the invention, it is otherwise provided that the effective connecting rod length is adjustable. For this purpose, it could, for. B. be provided that in the region of the Pleuelarms a screw connection is arranged, which forms the distance between the profiled disk side axis of rotation and the bearing shell side bearing axis changeable.

Here, the two connecting rods can be set completely independently.

In another embodiment of the invention, the bearing axis is designed to be adjustable in the direction of the longitudinal axis of the connecting rod. For this purpose, an intermediate piece is arranged in the bearing axis, which is designed to be adjustable. Such an intermediate piece can be made adjustable, for example, by a splined connection or an eccentric or another length-adjustable element, so as to likewise make the distance between the profiled disk-side axis of rotation and the bearing shell-side bearing axis adjustable.

1. 1. Durch die Anordnung von Pleueln (min. 2) ergeben sich mehrere Druckpunkte zur Kraftaufnahme.
2. 2. Da die Position der Druckpunkte bestimmbar ist, kann die Wirkungsweise der Umformung beeinflusst werden. Daraus ergeben sich Vorteile bei der Umformung bezogen auf die Zahnqualität hinsichtlich Maßhaltigkeit und Verfüllgrad.
3. 3. Die Stellung des Pleuels in Verbindung mit den Druckpunkten ermöglicht es für die Vorrichtung (Werkzeuge) deutlich geringere Halte- und Arbeitskräfte zu erzielen.
4. 4. Bei der Anordnung und Ausführung der Vorrichtung sind die Umformwege erheblich geringer als gegenüber den bekannten Verfahren.
5. 5. Die genannten Vorteile aus Punkt 3 haben zur Folge, dass keine zusätzlichen Gasdruckfedern oder hydraulische Kissen erforderlich sind. Somit sind die Standardpressen mit ihren Funktionen ausreichend.
6. 6. Auch bei dieser Vorrichtung ist es möglich, eine in axialer Richtung der Pleuel wirksame Verstellung an den Pleueln einzubringen, die es erlaubt, auf Maßeinteilungen direkt oder indirekt zu reagieren, z. B. durch eine verstellbare Aufnahme der Pleuel oder durch einen verstellbaren Lagerpunkt an der gehäusefesten Lagerschale. Die Längenveränderung der wirksamen Länge der Pleuel kann durch Abstimmscheiben oder Exzenterbuchsen in der Lagerbuchse erfolgen.
7. 7. Die Druckverteilung auf die Profilscheibe wird durch die min. 2 voneinander beabstandeten Lagerpunkte verkleinert.
8. 8. Durch die gewählten Lagerpunkte werden nicht nur kreisförmige Bewegungen (Stand der Technik) abgefahren, sondern es können davon abgewandelte Kurven entwickelt werden, die für jedes Werkstück geeignet sind wie z. B. das weiche Eindringen einer Profilscheibe in ein Bauteil.
   Das schnelle Öffnen eines Lastpunktes verhindert das Klemmen von fertig verformten Bauteilen. Damit ist jegliches Profil für die Längsnuten möglich, z. B. Hinterschnitte, große Durchmessersprünge, Lücken oder Erhebungen am Bauteil.
9. 9. Durch die Gestaltung des abzuwälzenden Profiles kann auch speziell für Innenlamellenträger (Hubs) die beginnende Verzahnung am Boden/Deckel deutlich verbessert werden, da die Profilscheibe den Walzprozess im Ablauf der Materialverformung zum Boden hindrücken kann.
10. 10. Ein Klemmen der Profilscheiben zwischen min. 2 Kontaktflächen ist nicht erforderlich, da sich durch den Formschluss die Profilscheibe in seiner Position behält.

With the realization of the invention, the following advantages result:

1. 1. The arrangement of connecting rods (at least 2) results in several pressure points for the absorption of force.
2. 2. Since the position of the pressure points can be determined, the effect of the deformation can be influenced. This results in advantages in terms of dimensional accuracy and degree of filling in relation to the tooth quality.
3. 3. The position of the connecting rod in connection with the pressure points makes it possible for the device (tools) to achieve significantly lower holding and manpower.
4. 4. In the arrangement and design of the device, the forming paths are considerably less than compared to the known methods.
5. 5. The advantages mentioned under point 3 mean that no additional gas pressure springs or hydraulic cushions are required. Thus, the standard presses with their functions are sufficient.
6. 6. Also in this device, it is possible to bring an effective in the axial direction of the connecting rod adjustment to the connecting rods, which allows to respond directly to measurement graduations or indirectly, for. B. by an adjustable recording of the connecting rod or by an adjustable bearing point on the housing-fixed bearing shell. The change in length of the effective length of the connecting rod can be done by tuning discs or eccentric bushings in the bearing bush.
7. 7. The pressure distribution on the profile disc is determined by the min. 2 spaced bearing points reduced.
8. 8. By the selected bearing points not only circular movements (prior art) are traversed, but it can be developed modified curves that are suitable for each workpiece such. B. the soft penetration of a profile disc in a component.
   The fast opening of a load point prevents the clamping of completely deformed components. Thus, any profile for the longitudinal grooves is possible, for. B. undercuts, large diameter jumps, gaps or elevations on the component.
9. 9. Due to the design of the profile to be rolled off, the incipient toothing on the bottom / cover can be significantly improved, especially for inner disc carriers (hubs), since the profile disc can move the rolling process to the bottom in the course of material deformation.
10. 10. Clamping the profile discs between min. 2 contact surfaces is not required because the profile disc retains its position due to the positive locking.

In the following the invention will be explained in more detail with reference to only one embodiment in the illustrative drawings.

Figur 1:

schematisiert im Schnitt die Vorrichtung zur Herstellung von Längsnuten in einem zylindrischen Bauteil

Figur 2 bis Figur 4:

der Bewegungsablauf des Oberstempels in Verbindung mit dem Bewegungsablauf der Profilscheiben beim Drückumformen des Bauteils

Figur 5:

Schnitt gemäß der Linie V-V in Figur 1

Figur 6:

schematisiert die Anordnung eines einzigen Pleuelpaares mit einer Möglichkeit zur Einstellung der Länge des Pleuels

Figur 7:

schematisiert die Draufsicht eine Profilscheibe mit zwei Pleueln

Figur 8:

Vergleich einer kreisförmigen Bewegungskurve mit der pleuel- geführten Bewegungskurve nach der Erfindung

Show it:

FIG. 1:

schematically shows in section the device for producing longitudinal grooves in a cylindrical component

2 to 4:

the movement sequence of the upper punch in connection with the movement of the profile discs during the pressure forming of the component

FIG. 5:

Section according to the line VV in FIG. 1

FIG. 6:

schematized the arrangement of a single pair of connecting rods with a possibility for adjusting the length of the connecting rod

FIG. 7:

schematizes the plan view of a profile disc with two connecting rods

FIG. 8:

Comparison of a circular motion curve with the connecting rod-guided motion curve according to the invention

The device for producing longitudinal grooves in a cylindrical member 11 is gem. FIG. 1 from an upper punch 9, which is driven displaceably via a drive not shown in the direction of its longitudinal axis.

It runs over a scraper 8 into the machine housing 25 and carries at its front free end a rolling punch 7, on which the component 11 to be deformed is arranged.

Evenly distributed around the circumference are a plurality of profiled discs 4 segment-shaped and each radially inwardly disposed in the machine housing 25, as best of FIG. 5 can be seen.

Each profiled disc 4 is guided by two spaced-apart connecting rods 1 and 2 in their rolling movement. Gem. FIG. 7 thus forms the one end of the connecting rod 1, 2 each have a rotation axis 17 in the region of the profile disk 4, while the opposite end of the connecting rod 1, 2 forms a bearing axis 16 in a housing-fixed bearing shell 3.

In FIG. 1 the lowest position of a lifting floor 5 is shown. This serves to set with its stop edge 26 at the respective lower end of the profile disc 4 and support it. In FIG. 1 already the finished deformed state of a component 11 is shown, because the lifting floor 5 is in its lowest position and the profiled disc 4 is supported on the stop edge 26.

Therefore, to deform a new component, the upper punch 9 moves back upwards and follows the lifting base 5 so as to bring the profiled discs 4 back into their raised position.

The upper punch 9 and the component to be deformed 11, a partial lifter 6 is arranged opposite in the axial direction, which is also slidably held in the receiving bore of the machine housing 25 and carries an intermediate bolt 10 at its lower end.

The partial lifter 6 is intended for ejecting the deformed component 11 and conveys the deformed component 11 upwards when the upper punch 9 has moved back to be able to remove the component from the central receiving bore in the machine housing 25.

The movement sequence for the deformation of a component 11 with two nested teeth 12, 13 is based on FIGS. 2 to 5 shown.

In the raised position after FIG. 2 moves the upper punch 9 in the direction of arrow 21 down and promotes the component to be deformed 11 in the contact region of the profile discs 4, as determined by the FIG. 3 is drawn. Here, the part 11 carrying the part lifter 6 moves in the direction of arrow 20 down.

Gem. FIG. 3 Now comes the component to be deformed in the region of a contact point 22 with the profiled disks 4 in contact and by friction, the profiled disks 4 are taken down in the direction of arrow 20 and roll with the introduction of radially inwardly directed longitudinal grooves deforming on the outer circumference of the component. This is in FIG. 4 shown.

The FIG. 4 shows the lowest position, approximately as shown FIG. 1 corresponds, in which the component 11 to be deformed with the two staggered teeth 12, 13 is provided.

This turns out FIG. 5 where it can be seen that the teeth 12, 13 are arranged offset from one another on the circumference.

The FIG. 6 shows a first way to adjust the length of the respective connecting rod 1, 2. Here it can be seen that at the rear end of the bearing shell 3, an intermediate piece 23 is loosely mounted in the bearing shell and this results a Verstellspiel 15 in relation to an oppositely arranged and adjustable trained adjusting wedge 14th

In this way, thus the effective length of the respective connecting rod 1, 2 is set.

In the general description it was also pointed out that the length of the connecting rods 1, 2 itself is variable by each connecting rod is formed in two parts, wherein one part is designed as a screw sleeve and the other part as a screw.

It is also possible, instead of a spindle adjustment to change the length of the connecting rods 1, 2 make an eccentric adjustment. In this case, an adjustable eccentric bush is arranged in the region of the bearing shell 3, specifically in the region of the bearing axis 16.

The FIG. 7 shows the movement curve of the profile disc 4, which deviates greatly from the movement curve of a circular path. Here, the profile disc 4 moves in the direction of arrow 18 upwards and that according to a somewhat flat, non-circular motion curve, this profile curve 24 therefore follows no circular path, but rather a movement curve whose radius of curvature is smaller than the circular path, the faster immersion movements of the profile disc to achieve on the component to be deformed 11 and in a corresponding manner, a faster lifting movement of the profiled disk of the component 11. This results in a softer immersion of the profiled disk 4 in the material of the component 11 and also a correspondingly faster notching of the profile curve 24 from the deformed component, whereby clamping phenomena between component and profiled disk are greatly minimized.

So there are made less movement paths with faster Abhebe- and faster immersion movements. This is a significant advantage over the prior art.

drawing Legend

1.

Connecting rod 1

Second

Connecting rod 2

Third

bearing shell

4th

profile disc

5th

Rising platform

6th

part Heber

7th

roll temple

8th.

scraper

9th

upper punch

10th

intermediate pin

11th

component

12th

gearing

13th

gearing

14th

adjusting wedge

15th

Verstellspiel

16th

bearing axle

17th

axis of rotation

18th

arrow

19th

arrow

20th

arrow

21st

arrow

22nd

contact point

23rd

connecting piece

24th

profile curve

25th

machine housing

26th

stop edge

27th

Circular course (St. d. T.)

28th

motion curve

Claims (9)

1. Device for producing longitudinal grooves in cylindrical workpieces (11), consisting of an upper tool part with an upper stamp (9), on the lower end of which a roller stamp (7) is arranged, which, during use, carries the component to be formed, a number of profile discs (4) distributed at the periphery of the roller stamp (7) being arranged opposite in the housing (25), which profile discs are configured in such a way that, during use, they in each case carry out a rolling movement directed radially inwardly on the component (11) to be formed, the movement guide of which is rotatably mounted in the bearing shell (3) fixed to the housing, characterised in that the respective profile disc (4) is movably driven by at least two piston rods (1, 2) arranged spaced apart from one another, one respective end of the piston rod (1, 2) being held in a receiver in the profile disc (4) and the other respective end of the piston rod (1, 2) being rotatably mounted by means of a respective bearing pin (16) in a bearing shell (3) fixed to the housing.
2. Device according to claim 1, characterised in that a double mounting of the profile disc (4) is provided by the two bearing pins (16), which are arranged spaced apart from one another, of the two piston rods (1, 2).
3. Device according to claim 1 or 2, characterised in that more than two piston rods (1, 2) are provided to guide the movement of the respective profile disc (4).
4. Device according to any one of claims 1 to 3, characterised in that the effective length of the piston rod (1, 2) can be adjusted.
5. Device according to any one of claims 1 to 4, characterised in that the bearing pin (16) is adjustably configured in the direction of the longitudinal axis of the piston rod (1, 2).
6. Device according to any one of claims 1 to 5, characterised in that a part lifter (6) is arranged opposing the upper stamp (9) and the component (11) to be formed in the axial direction and is displaceably held in the receiving bore of the machine housing (25) and carries an intermediate bolt (10) at its lower end.
7. Method for producing longitudinal grooves in cylindrical workpieces in a device consisting of an upper tool part with an upper stamp (9), on the lower end of which a roller stamp (7) is arranged, which carries the component to be formed, a number of profile discs (4) distributed at the periphery of the roller stamp (7) being arranged opposite in the housing (25), which profile discs carry out a rolling movement directed radially inwardly, in each case, on the component (11) to be formed, the movement guide of which is rotatably mounted in bearing shells (3) fixed to the housing, characterised in that the profile discs (4) carry out a movement, which differs from a circular movement path, at the outer periphery of the component (11) to be formed.
8. Method according to claim 7, characterised in that when the profile disc (4) is unclipped or removed from the component, a lifting-off movement which is faster than a circular lift-off movement takes place, without there being a risk of the component jamming on the profile disc (4).
9. Method according to claim 7, characterised in that during introduction of the profile disc (4) onto the component, a softer pressing-in movement takes place compared to a circular pressing-in movement.

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