EP3060359B1 - Roller burnishing tool - Google Patents

Description

The invention relates to a roller burnishing tool for producing a tooth structure in the wall of a preform. It is generally about producing a spline in the wall of a cylindrical blank to produce a gear.

Such a roller burnishing tool comprises disc-like rollers which are rotatably mounted. The rollers are arranged such that their peripheral edges roll along the lateral surface of the cylindrical blank, applying a pressure to the lateral surface, so that the lateral surface is pressed in, whereby a tooth space is formed. There are a variety of roles associated with the preform. The rollers run - seen in plan view of the cylindrical blank - more or less radially to this. At the same time a so-called stamp is provided within the blank. This fills the interior of the blank. The punch is toothed in the manner of a gear, so that when creating a tooth gap through one of said disc-shaped rollers, a tooth of the punch from the inside presses on the wall of the cylindrical blank while pressing material between two adjacent rollers outward and thus forms a tooth on the blank ,

On EP 2 282 854 B1 is referred to, which describes a Rollumformverfahren.

With rolling tools of the type described to create a final product that complies with the target dimensions with high accuracy. This concerns in particular the width of the tooth gaps. However, time and again it shows that this requirement can not be met. The main reasons for deviations from the nominal dimension are differences in the quality of the steel used. This can lead to significant deviations in the target dimensions when using qualitatively different steel batches.

In the case of such deviations, changes must be made to the roller burnishing tool. In particular, it is then necessary to replace the disc-shaped rollers. If the burnishing process leads to excessively deep tooth gaps, then you have to choose rolls of small diameter, and vice versa. Such change processes are complex and expensive. In particular, you need a large supply of roller burnishing. In case of dimensional deviations of the workpiece, the current roles must be removed from the roller burnishing tool, suitable rolling rollers selected from the stock and these are installed.

DE 2 017 709 describes a tool for rolling longitudinal grooves in cylindrical workpieces, wherein the profile rollers are movably mounted in the direction of the rolling force. Each profile roller is supported by two support rollers touching the profile roller at its circumference, which are mounted in a receiving body. Between each receiving body and an inner wall of a Armierungsringes an adjusting wedge is provided, which can be adjusted by two lag screws. A disadvantage of this arrangement is that an exchange of the profile rollers, for example by a roller with a new outer contour for producing a different teeth, only with a simultaneous adjustment, in particular an exchange of the support rollers can be done and the entire arrangement a large space requirement and an unfavorable load application has in the various components.

DE 10 2009 044 544 A1 describes a forming device and a Einrichtverfahren for introducing an internal and external teeth in a cylindrical workpiece, in which the profile rollers are mounted for adjustment on eccentric bushes. On the further state of the art is on DE 10 2008 017 608 B3 and DE 10 2007 062 361 A1 directed.

EP 0 761 338 A1 discloses a roller burnishing tool for producing a tooth structure in a wall of a cylindrical blank, wherein a wedge-shaped intermediate body is provided, and wherein radial forces arising are taken up exclusively by the rollers radially supporting abutments, but not by a cage which holds the profile rollers in a common plane. The serving for supporting the rollers shafts or bolts are essentially free of forces.

The invention has for its object to design a roller burnishing tool according to the preamble of claim 1 such that you can respond quickly and with little effort to deviations of the workpiece. The roller burnishing tool is intended to provide, in particular, an alternative to the conventional adaptation of the penetration depth or the profile of the rollers, which is improved in terms of installation space and costs, as well as in terms of service life.

This object is achieved with a roller burnishing tool of each of the three independent claims.

In all three main ideas, an intermediate body is advantageously provided. This exerts a pressure on the bearing journals of the rollers, so that they are displaced against the lateral surface of the blank. Each intermediate body is supported by a fixed environment.

According to the first main idea, the intermediate body is wedge-shaped. The contact pressure can be adjusted by adjusting the position of the wedge-shaped intermediate body. The position of the intermediate body in a feed direction for producing a relative movement between the rollers and the blank is determined by at least one replaceable spacer.

For example, the at least one spacer is formed by at least one interchangeable positioning ring or interchangeable positioning ring segment, typically a plurality of circumferentially spaced positioning ring segments. For example, the wedge-shaped intermediate body can be enclosed on both sides by exchangeable spacers, in particular exchangeable positioning rings or exchangeable positioning ring segments, in the aforementioned feed direction for generating the relative movement. In particular, lies the wedge-shaped Intermediate body, which is advantageously designed as a wedge ring, on at least one spacer element, advantageously at least one positioning ring or a plurality of positioning ring segments and is thereby supported.

The spacer, in particular the at least one positioning ring or the positioning ring segments, can be detachably connected to the intermediate body, in particular screwed.

According to the second main idea of the invention, a hydrostatic pressure chamber is provided. By changing the hydrostatic pressure, the position of the rollers relative to the blank can be changed. When providing an intermediate body, this may for example have a space which can be connected to a hydrostatic pressure medium in order to inflate the said space more or less and thus to change the dimension of the intermediate body in the pressing direction.

According to the third main idea of the invention, the intermediate body or another element which exerts the contact pressure at least indirectly can be tempered, preferably by means of electrical resistance heating. Again, this allows the distance between the rollers change relative to the blank.

Particularly in the second and third main aspects of the invention, changing the position of the rollers relative to the blank may even be advantageously done during operation, at least without any rebuilding or removal of the rollers.

Figur 1

zeigt in einem Axialschnitt die wesentlichen Bauteile eines Rollierwerkzeugs gemäß einem Ausführungsbeispiels der Erfindung.

Figur 2

zeigt in perspektivischer Darstellung einen Ausschnitt aus dem Rollierwerkzeug gemäß Figur 1.

Figur 3

zeigt wiederum in einer perspektivischen Darstellung einen weiteren Ausschnitt aus dem Gegenstand von Figur 1.

The invention is explained in more detail with reference to the figures and an embodiment. It details the following:

FIG. 1

shows in an axial section the essential components of a roller burnishing tool according to an embodiment of the invention.

FIG. 2

shows a perspective view of a section of the roller burnishing according to FIG. 1 ,

FIG. 3

again shows in a perspective view another section of the object of FIG. 1 ,

This in FIG. 1 Rolling tool shown comprises the following components: One of numerous rollers 1 (roller burnishing) is rotatably mounted on a journal 2. The bearing journal 2 is in turn mounted in a housing 3. The housing 3 is fixed in a so-called boiler house 4, which has a cover 5.

A blank 6 has the shape of a cylindrical hollow body with a closed bottom 6.1 and a cylindrical wall 6.2. The blank 6 is made of a blank by deep drawing. The circuit board is a circular steel disk. To produce a gear from the blank 6, 1 grooves must be pressed into the wall 6.2 by rolling by means of the rollers. This is done in the present case in that the blank 6 is moved from an upper position I shown here in a lower position II also shown. As can be seen, the roller 1 is mounted and arranged so that it pushes the wall 6.2 when lowering the blank 6 inward. In each case two adjacent rollers 1 form a tooth which is parallel to the feed direction 7 of the blank 6.

The blank 6 is clamped between a counter-holder 8 and a punch 9. The counter-holder 8 is fixedly connected to a quill 10, for example by screwing. The punch 9 is located inside the blank 6. It is itself shaped like a gear. The teeth of the punch 9 work together during rolling process with the rollers 1 by one tooth of the punch 9 engages between two adjacent rollers 1.

According to the first main idea of the invention, an intermediate body 11 is provided. This is preferably designed as a wedge ring and surrounds all rollers 1 with the plurality of housings 3 and the center arranged in the blank 6. The arrangement of the wedge ring is made FIG. 2 seen. The intermediate body 11 may be divided into numerous individual bodies or be made in one piece.

The radial position of the rollers 1 can be adjusted by means of the wedge-shaped intermediate body 11. How to get out FIG. 1 the further the wedge-shaped intermediate body 11 is driven into the receiving space 12, the deeper penetrates the peripheral edge of the single roller 1 in the material of the blank 6 and thus the tooth height becomes greater ,

From the Figures 2 and 3 can be seen even more precise shape and arrangement of the rollers 1 and the associated housing 3. In each case two adjacent rollers 1 are in a housing 3, here in two parts, arranged. Between two adjacent pairs of rollers 1 there is a wedge segment 15. This is stationary and determines the orientation and the position of the housing 3, and thus also the rollers. 1

In the present embodiment, the boiler house 4 is stationary with the housings 3 and rollers 1 arranged therein. By contrast, the preform 6 performs the already mentioned translatory movement in the feed direction 7, here from top to bottom, optionally also from bottom to top. The blank 6 takes in its translational movement, the rollers 1 by frictional engagement with and thus puts these in circulation. The rollers 1 thus need no own drive.

The position of the intermediate body 11 in the feed direction 7 is defined by exchangeable positioning rings 14. The positioning rings 14 may be designed as circumferentially closed rings. However, they can also be formed by a plurality of individual spaced from each other or adjacent to each other positioned ring segments. Finally, instead of the positioning rings 14 and not annular spacers can be used. By the spacers, here the positioning rings 14, with the position of the intermediate body 11 in the feed direction 7 at the same time the penetration depth of the disc-shaped rollers 1 is defined in the material of the blank 6. Thus, the penetration depth can be changed by inserting accordingly in their thickness (height) designed positioning 14. If the positioning ring 14 in the feed direction 7 at the narrow end of the receiving space 12 is comparatively thin, so the wedge-shaped intermediate body 11 immersed deeper into the tapered receiving space 12 a and pushes the housing 3 adjacent to it and thus over the bearing journal 2, the roller 1 comparatively further in the direction of the blank 6. If, however, (in the drawing below in the receiving space 12) a comparatively thicker positioning ring 14 is inserted, the intermediate body 11 in Direction shifted to the other portion of the receiving space 12, so that the housing 3 with the roller 1 in the direction of the supporting fixed environment, here the boiler house 4, press and the role 1 dives less in the wall 6.2 of the blank 6 a.

In the embodiment shown, the bearing journals 2 have a special shape, which can also be embodied independently of the features described further in this exemplary embodiment. Thus, the bearing journals 2, each carrying a roller 1, here in each case a pair of rollers 1, at its axial portions which protrude beyond the rollers 1 and are inserted into the housing 3 or the housing 3, provided with a flattening 13. This flattening 13 is in the FIGS. 1 . 2 and 3 seen. The flats 13 are provided on the peripheral portion of the bearing pin 2, in the direction of the fixed Environment in which the housing 3 supported by the or the intermediate body 11, positioned. In this way, a more favorable surface pressure between the bearing pin 2 and the housings 3 is achieved when the pressure force resulting from the advancement of the rollers 6 in the feed direction 7, on the rollers 1, the bearing pin 2, the housing 3, the or the intermediate body eleventh in the fixed environment, here the boiler house 4, is derived. A flattening 13 may, for example, as shown in FIG. 2 it can be seen, pass over in each case a chamfer or bevel in the circumferential direction in the round, in particular circular peripheral region of the journal 2. The mating contour in the housing 3 does not have to be designed identically; there, for example, a round or rounded transition in the circumferential direction from the region of the flattening into the round or circular circumferential section is possible.

In the design shown here, with the exception of the flats 13 are substantially cylindrical bearing journal provided with beveled end faces, see the chamfer 16. The two end chamfers 16 of a journal 2 extend toward each other in the direction of the blank 6. As a result, the bearing journals 2 can be positioned closer to each other in the manner of a polygon, over the circumference of the blank 6. Advantageously, the bearing journal 2 receiving housing 3 on the side facing away from them supported rollers 1 a corresponding chamfer 17, which is in particular flush with the chamfer 16 of the bearing pin 2 and / or is positioned plane-parallel thereto.

In the exemplary embodiment shown, the housings 3 likewise have a planar contact surface on their outer side facing the intermediate body 11, in contrast to an annular bearing surface. This also leads to a more favorable surface pressure. The intermediate body or bodies 11 accordingly have at their inner periphery, which faces the blank 6 is, flat contact surfaces and form, as from the FIG. 3 is particularly well visible, on its inner circumference a polygon. At its outer periphery, however, the one or more intermediate body 11 may be annular, but this is not mandatory, depending on the design of the contact surface of the fixed environment, here the boiler house. 4

The rollers 1 are mounted exclusively on the bearing journal 2, thus no support rollers or the like are provided or support areas on the outer circumference of the rollers 1. Thus, it is particularly easy, a roller 1 having a first outer contour, which forms a first type of toothing, replace with another roller 1 with a different contour for a different type of toothing. In the present case, it is also easily possible by the design of the housing 3 to take these together with the rollers 1 from the areas between the wedge segments 15. So are always two housing 3 or housing parts angular, in particular designed L-shaped and form in the assembled state a U-shape, in each of which a roll 1 or here a pair of rollers 1 is added. At the outer end, the legs of the L-shaped housing parts abut each other and at the inner end of the distance is defined and secured by the bearing pin 2 used.

In the journal 2, a Schmierölnut 18 may be introduced, which here in the FIG. 2 can be seen and this is carried out on top of the journal 2.

The pairwise use of rollers 1 shown here, wherein in each case two Rotten1 adjacent to each other in a housing formed from two parts 3 or in two adjacent housing 3 is used, offers the advantage that comparatively small rollers 1 can be used in their diameter, without that the risk of a collision of the components carrying them over the circumference of the blank 6 threatens. Thus, a particularly compact embodiment can be created.

In the embodiment shown here, two spacers, preferably in the form of positioning rings 14 or two groups of spacers or positioning ring segments are provided, namely a spacer or a first group under the one or more intermediate bodies 11 and a second spacer or a second group above the or Intermediate bodies 11. These two spacers or groups of spacers together form each a constant height, so that an exchange of the or the intermediate body 11 for setting different penetration depths of the rollers 1 in the blank 6 is not necessary. However, in another attachment of the intermediate body or bodies 11, a spacer or a group of spacers could possibly be dispensed with.

Here the spacers (positioning rings 14) are screwed to the intermediate body 11. This is particularly advantageous when a plurality of spacers over the circumference of an intermediate body 11 or a plurality of intermediate bodies 11 over the circumference of the blank 6 is used. However, it may be possible to dispense with such a screw connection or another positive and / or frictional, but usually releasable connection can be used.

The other two main ideas are also very interesting in practice. This makes it possible to change the dimension of the intermediate body (or a plurality of intermediate bodies) 11 in the pressing direction of the rollers 1. This happens in the case of the second main idea by means of hydrostatic pressure. Namely intermediate body 11 can have a space which can be connected to a hydrostatic pressure medium, for example to a pressure oil, and which can inflate said space and thus increase the dimension of the intermediate body 11 in the pressing direction. You can also get one Integrate hydrostatic space in the boiler house or in the housing. Then the intermediate body 11 can be omitted.

It is therefore possible to do without an intermediate body 11 by simply providing a hydrostatically loadable space between the individual housings 3 and the boiler house 4.

According to the third main idea, the contact force acting on the bearing pin 2, and thus on the penetration depth of the roller 1 in the wall 6.2 of the blank 6, generated by tempering, preferably by means of electrical resistance heating. Whether one uses an intermediate body or another element that is responsible for the pressure, is a subordinate question.

The invention can be applied not only in the production of gradverzahnten gears, but also in helical gears. It does not even have to be gears, but it come for the application of the invention, any teeth into consideration, even on non-rotating components.

Reference number list

1

role

2

pivot

3

casing

4

boiler house

5

cover

6

blank

6.1

ground

6.2

wall

7

feed direction

8th

backstop

9

stamp

10

Pinole

11

intermediate body

12

accommodation space

13

flattening

14

positioning

15

wedge segment

16

bevel

17

bevel

18

lubricating oil groove

Claims (13)

1. Roller burnishing tool for producing a toothed structure in a wall (6.2) of a cylindrical blank (6), comprising the following features:

   1.1 a clamping device for retaining the blank (6);

   1.2 a rim of disk-shaped rotatably mounted rolls (1) whose peripheral edges are directed against the wall (6.2) of the blank and are adapted to be pressed there against;

   1.3 bearing pivots (2) for bearing the rolls (1);

   1.4 a stamp (9) in the interior of the blank (6) with a toothed structure as a counter mold;

   1.5 a drive for generating a relative movement in a feed direction (7) between the rolls (1) and the blank (6);
   characterized by the following features:

   1.6 a wedge-shaped intermediate body (11) is provided which presses the rolls (1) by exerting a pressure on the bearing pivots (2), supports itself at a fixed environment, and whose position in the feed direction (7) is determined by at least one exchangeable spacer.
2. A roller burnishing tool for producing a toothed structure in a wall (6.2) of a cylindrical blank (6), comprising the following features:

   2.1 a clamping device for retaining the blank (6);

   2.2 a rim of disk-shaped rotatably mounted rolls (1) whose peripheral edges are directed against the wall (6.2) of the blank and are adapted to be pressed there against;

   2.3 bearing pivots (2) for bearing the rolls (1);

   2.4 a stamp (9) in the interior of the blank (6) with a toothed structure as a counter mold;

   2.5 a drive for generating a relative movement between the rolls (1) and the blank (6);
   characterized by the following feature:

   2.6 a hydrostatic chamber is provided for positioning the rolls (1) relative to the blank (1).
3. A roller burnishing tool for producing a toothed structure in a wall (6.2) of a cylindrical blank (6), comprising the following features:

   3.1 a clamping device for retaining the blank (6);

   3.2 a rim of disk-shaped rotatably mounted rolls (1) whose peripheral edges are directed against the wall (6.2) of the blank and are adapted to be pressed there against;

   3.3 bearing pivots (2) for bearing the rolls (1);

   3.4 a stamp (9) in the interior of the blank (6) with a toothed structure as a counter mold;

   3.5 a drive for generating a relative movement between the rolls (1) and the blank (6);
   characterized by the following features:

   3.6 a tempering device, especially an electrical resistance heating, is provided to adjust the position of the rolls (1) relative to the blank (1), namely by tempering a component carrying the rolls (1) directly or indirectly.
4. The roller burnishing device according to claim 1, characterized in that the at least one spacer is formed by at least one exchangeable positioning ring (4) or exchangeable positioning ring segments.
5. The roller burnishing device according to claim 4, characterized in that the wedge-shaped intermediate body (11) is enclosed in the feed direction (7) on both sides by exchangeable spacers, especially positioning rings (14) or positioning ring segments.
6. The roller burnishing device according to any of claims 4 or 5, characterized in that the wedge-shaped intermediate body (11) rests on and is carried by at least one spacer, especially positioning ring (14), or a plurality of positioning ring segments.
7. The roller burnishing device according to any of claims 4 to 6, characterized in that the spacer, especially the at least one positioning ring (14) or the positioning ring segments, is/are connected releasably with the intermediate body (11), in particular screwed on.
8. The roller burnishing device according to any of claims 1 to 7, characterized in that the intermediate body (11) is designed as a tapered ring.
9. The roller burnishing device according to any or several of claims 1 to 8, characterized in that the rolls (1) are stored in a boiler house.
10. The roller burnishing device according to any of claims 1 to 9, characterized in that one roll or a pair of rolls (1) is each disposed in a single-part or multi-part, in particular two-part housing (3) and is carried by means of a bearing pivot (2) mounted in the housing (3).
11. The roller burnishing device according to any of claims 1 to 10, characterized in that the rolls (1) are positioned on bearing pivots and are carried thereby, wherein the rolls (1) are especially mounted exclusively by the bearing pivots (2).
12. The roller burnishing device according to any of claims 10 or 11, characterized in that the bearing pivots (2) comprise, at the two axial ends thereof, a bevel (16) over the circumference through which the pressure force acting on the rolls (1) is dissipated into the housings (3).
13. The roller burnishing device according to any of claims 1 to 12, characterized in that the bearing pivots (2) are, on both of their front sides, provided with bevels (17) approaching each other and are positioned over the circumference of the blank (6) like a polygon.

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