DE102005017588B3 - Taper roller bearing ring producing method, involves shaping ring from axially deep-drawn area of sheet metal by forming deep-drawn area of metal and separating largely completed bearing ring from non axial deep-drawn area of metal - Google Patents

Abstract

The method involves forming an annulus shaped or plate-shaped sheet metal (3), in which a radial inward located part (4) of the sheet metal is axially deep-drawn from a plane (5) of the metal. A taper roller bearing ring (1) is shaped from an axially deep-drawn area (6) of the metal by forming the deep-drawn area of the metal. The largely completed bearing ring is separated from the non axial deep-drawn area of the metal.

Description

The The invention relates to a process for producing at least one Tapered roller bearing ring.

at the production of rings of rolling bearings Occasionally, the sheet metal forming is used.

The DE 199 45 904 A1 discloses the manufacture of a needle bearing cup from a sheet metal part, wherein an inner and an outer bearing cup are interconnected. The bearing cups can be produced by a forming process.

From the DE 199 08 158 A1 is a double-row angular contact ball bearing known whose outer ring is formed by a bent sheet metal. The sheet is folded and at the same time forms a radially extending flange. In one end of the sheet, the raceways for the balls are formed.

The use of formed sheet metal is also known in a swash bearing, as in the DE 198 81 342 C1 is described. The necessary for such storage axial ball bearing is formed by a correspondingly shaped sheet metal, in which the raceways are formed for the balls.

Finally, the reveals DE 94 08 057 U1 a Tripodenrolle for a constant velocity joint, wherein the inner ring of this case used for needle bearing is formed by a correspondingly shaped sheet metal part, which is shaped so that form lateral Begrenzungsborde.

at Tapered roller bearings are not known such embodiments, since This is due to the relatively complex shape of the tapered roller bearing rings is relatively difficult. The bearing ring must be both cylindrical as well as a cone-shaped area have, which is difficult to accomplish with sheet metal forming. Therefore tapered roller bearing rings are usually made of solid material by conventional Turning made.

Of the Invention is based on the object, a process for the preparation of tapered roller bearing rings, with which it is more cost effective and easy way possible is to form such rings from a sheet-metal output part. The Rings should be as possible high precision exhibit. Turning operations should be dispensable.

• a) Umformen eines ringförmigen oder scheibenförmigen Blechs, indem der radial innenliegende Teil des Blechs aus der Ebene des Blechs axial tiefgezogen wird;
• b) Ausformen des mindestens einen Kegelrollenlagerringes zumindest im wesentlichen aus dem axial tiefgezogenen Bereich des Blechs durch Umformen des axial tiefgezogenen Bereichs des Blechs;
• c) Abtrennen des zumindest weitgehend fertig ausgeformten Kegelrollenlagerringes von dem nicht axial tiefgezogenen Bereich des Blechs.

The solution of this problem by the invention is characterized in that it comprises the method steps:

• a) forming an annular or disc-shaped sheet by the sheet metal is axially deep drawn axially from the plane of the sheet;
• b) forming the at least one taper roller bearing ring at least substantially from the axially deep-drawn portion of the sheet by forming the axially deep-drawn portion of the sheet;
• c) separating the at least largely finished molded tapered roller bearing ring from the non-axially deep-drawn portion of the sheet.

According to the invention proposal So is an axially extending deep-drawn area made a flat disc or annular sheet metal, from then the tapered roller bearing ring is formed without cutting; to the molding is the largely finished ring from the rest of the sheet separated. With largely manufacturing the tapered roller bearing ring is to understand that the essential shape of the ring then is completed. usual Hardness- and finishing operations, such as grinding and honing, can become still connect.

A Embodiment of the invention provides that the deformation of the disc-shaped sheet according to the above Step a) is carried out so that the axially deep-drawn portion of the sheet cup-shaped is trained.

• b_1i) Anformen einer zylindrischen Innenfläche in den axial tiefgezogenen Bereich, sowie den Schritt:
• b_2i) Anformen einer axialen Anlagefläche, die sich über den radialen Bereich des zu fertigenden Kegelrollenlagerinnenrings erstreckt und die gegenüber der Ebene des Blechs eine vorgegebene Tiefe aufweist.

This is preferably provided in the production of a tapered-roller bearing inner ring, it then being possible for the execution of the shaping according to step b) above to have the further step:

• b _1i ) forming a cylindrical inner surface in the axially deep-drawn area, and the step:
• b _2i ) forming an axial abutment surface which extends over the radial region of the tapered roller bearing inner ring to be manufactured and which has a predetermined depth with respect to the plane of the metal sheet.

In carrying out the above step b _2i ), an at least partially rounded or chamfered transition from the abutment surface to the cylindrical inner surface can be produced.

• b_3i) Abstrecken des axial tiefgezogenen Bereichs bei abgestützter Innenfläche und gegebenenfalls abgestützter Anlagefläche, so dass eine kegelförmig ausgebildete Außenfläche entsteht, sowie der Schritt:
• b_4i) Anprägen einer die kegelförmig ausgebildete Außenfläche begrenzenden Schulter in dem dem nicht axial tiefgezogenen Bereich des Blechs benachbarten Bereich des Blechs.

Furthermore, the method step can be provided:

• b _3i ) stretching the axially deep-drawn region with supported inner surface and optionally supported contact surface, so that a conically shaped outer surface is formed, and the step:
• b _4i ) embossing a cone-shaped Outside surface limiting shoulder in the non-axially deepened portion of the sheet metal adjacent area of the sheet.

• b_4i') Einbringen eines Freistichs zwischen der kegelförmig ausgebildeten Außenfläche und der Schulter.

For an optimal start-up of the tapered roller, it has proven useful if the step is provided simultaneously with the above step b _4i :

• b _4i ') introducing an undercut between the conically shaped outer surface and the shoulder.

• b_5i) Anprägen einer die kegelförmig ausgebildete Außenfläche begrenzenden Schulter in dem vom nicht axial tiefgezogenen Bereich des Blechs entfernten Bereich des Blechs.

Accordingly, the step can further be provided:

• b _5i ) embossing a shoulder delimiting the conically shaped outer surface in the area of the sheet removed from the non-axially deep-drawn region of the sheet metal.

• b_5i') Einbringen eines Freistichs zwischen der kegelförmig ausgebildeten Außenfläche und der Schulter.

Also in this case, the step may be provided simultaneously with step b _5i :

• b _5i ') introducing an undercut between the conically shaped outer surface and the shoulder.

• b_6i) Ausstanzen des die zylindrische Innenfläche axial begrenzenden Bereichs des Blechs.

The step further preferably follows:

• b _6i ) punching out of the cylindrical inner surface axially delimiting portion of the sheet.

• b_1a) Anformen einer zylindrischen Innenfläche in den axial tiefgezogenen Bereich bei gleichzeitiger Unterstützung des radial außenliegenden, kegelförmig ausgebildeten Abschnitts des tiefgezogenen Bereichs.

In particular for the production of a tapered roller bearing outer ring, the reshaping of the annular plate according to the above step a) can take place so that the axially deep drawn region extends substantially below the cone angle of the tapered roller bearing ring to be produced from the plane of the sheet axially, ie in the deep drawing direction. In this case, for the production of a tapered roller bearing outer ring, the execution of the shaping according to the above step b) can comprise the step:

• b _1a ) forming a cylindrical inner surface in the axially deep-drawn region while supporting the radially outer, conically shaped portion of the deep-drawn portion.

• b_2a) Anformen einer unter dem Kegelwinkel ausgerichteten axialen Anlagefläche, die sich über den radialen Bereich des zu fertigenden Kegelrollenlageraußenrings erstreckt und die gegenüber der Ebene des Blechs eine vorgegebene Tiefe aufweist.

This is preferably followed by the method step:

• b _2a ) forming an under the cone angle aligned axial bearing surface which extends over the radial region of the tapered-roller bearing outer ring to be manufactured and which has a predetermined depth with respect to the plane of the sheet.

• b_3a) Verbiegen des umgeformten axial tiefgezogenen Bereichs um den Übergangsbereich zwischen dem nicht axial tiefgezogenen Bereich des Blechs und dem axial tiefgezogenen Bereich des Blechs, so dass die gefertigte zylindrische Innenfläche eine kegelige Form einnimmt, die unter dem Kegelwinkel verläuft, und dass der radial außenliegende, kegelförmig ausgebildete Abschnitt eine zylindrische Form einnimmt.

In carrying out this step, a largely sharp transition from the contact surface to the cylindrical inner surface is preferably produced. With particular advantage then joins the step:

• b _3a ) bending the deformed axially deep-drawn region around the transition region between the non-axially deep-drawn region of the sheet and the axially deep-drawn region of the sheet, so that the manufactured cylindrical inner surface assumes a conical shape that runs below the cone angle, and that the radially outer , conically shaped portion assumes a cylindrical shape.

After that becomes the preformed conical surface to the cylindrical outer surface of Tapered roller bearing outer ring converted and accordingly the preformed cylindrical inner surface for conical raceway the roles.

For all embodiments The invention is that after the separation of at least substantially Fully formed tapered roller bearing ring of the non-axially deep-drawn Area of the sheet, so from the sheet metal rest, to desired Edges of the manufactured tapered roller bearing ring edge shortenings attached can be. It can also be further provided that after disconnecting the at least largely finished molded tapered roller bearing ring a hardening the tapered roller bearing ring takes place. This in turn can turn into usual Make a grinding of the tapered roller bearing ring or another or other hard machining process steps, in particular a Honing process, connect.

With The proposed approach makes it possible to use a sheet metal disc or from a sheet metal ring a tapered roller bearing inner ring or a tapered roller bearing outer ring in an easy and fast way and with that economical can be done.

The Ring production takes place without cutting thereby the strength of storage. In particular, can be dispensed with the rotation of the ring, which represents an essential process simplification. By the non-cutting Manufacture may be due to the precision achievable with this method only slight grinding allowance added so that the further processing of the ring, d. H. the Hard finishing, can be done efficiently.

From Another advantage is that - especially in small and medium sized Tapered roller bearing rings - one Cold sheet forming performed can be. Thus, unlike hot forming, turning remains the tapered roller bearing ring blanks dispensable.

In the drawing are embodiments of Invention shown. Show it:

1 the section through a metal sheet into which a cup-shaped depression has been introduced by deep-drawing,

2 the cup-shaped recess according to 1 to which a cylindrical inner surface and an axial abutment surface has been formed,

3 the pot-shaped depression after 2 to which a conical outer surface has been further molded,

4 the pot-shaped depression after 3 to which axial shoulders have been further molded,

5 the finished tapered roller bearing inner ring according to an embodiment in section,

6 the magnification X after 5 .

7 the finished tapered roller bearing inner ring according to another embodiment in section,

8th the magnification Y after 7 .

9 the finished tapered roller bearing inner ring as well as the plate remnants separated therefrom,

10 the section through a ring-shaped sheet before deep drawing,

11 the sheet according to 10 after the deep drawing or through-necking of an axially deep-drawn region,

12 the sheet according to 11 to which a cylindrical inner surface, a conically shaped outer surface and an axial abutment surface has been formed,

13 the shaped sheet after 12 after the tapered roller bearing outer ring forming parts have been bent,

14 the finished tapered roller bearing outer ring and

15 the tapered roller bearing outer ring with attached edge cuts or rounding.

In 1 is a tin 3 to see that initially has a disk-shaped training. In a first forming process, ie here by a deep-drawing process, a cup-shaped depression 25 in the tin 3 introduced, ie there is an axially deep-drawn area 6 of the sheet 3 , In this case, the radially inner part 4 of the sheet 3 out of the plane 5 of the sheet 3 pushed out. In the cup-shaped depression 25 is already marked with thin lines, like the cup-shaped depression 25 non-cutting to produce tapered roller bearing inner ring 1 looks. It can be seen that the ring 1 essentially exclusively from the axially deep-drawn area 6 will be produced.

Already during deep drawing of the cup-shaped depression 25 or in a subsequent step will, like it 2 shows a cylindrical inner surface 7 to the axially deep-drawn area 6 molded, that of the cylindrical bore of the tapered roller bearing inner race to be produced 1 equivalent. For this purpose, an unillustrated punch axially into the cup-shaped recess 25 be pressed. Out 2 is also apparent that an axial bearing surface 8th to the ring to be manufactured 1 is formed, which is done by an unrepresented punch to the depth t _i in the sheet 3 is pressed. This creates an at least partially rounded transition 9 between the axial contact surface 8th and the cylindrical inner surface 7 , The embossing of the surface 7 and the area 8th can also be done simultaneously with a correspondingly shaped stamp.

In 3 can be seen that subsequently - with supported inner surface 7 and contact surface 8th the axially extending deep drawn area 6 is further stretched, whereby the conical outer surface 10 arises, which runs below the desired taper angle of the tapered roller bearing inner ring. It can be a stamp 26 in the cylindrical inner surface 7 be inserted (schematically in 4 ) Indicated.

At the same time can be a shoulder 11 to be stamped with the remaining sheet 3 is adjacent. In 4 you can see that then also a shoulder 13 can be formed in the other axial end portion of the bearing ring, which takes place by displacement of the material, which is in the axial end portion of the cup-shaped recess 25 located. Schematically are impressions 27 to recognize that come from an appropriate tool to bring the material to flow.

Details are in the 5 to 8th to recognize. The 5 and 7 show the finished tapered roller bearing inner ring 1 and the shoulders attached to them 11 and 13 , 6 it can be seen that between the shoulder 11 and the cone-shaped outer surface 10 an underdog 12 was imprinted with. Accordingly, an underdog 14 at the transition of the conically shaped outer surface 10 and the shoulder 13 formed.

9 shows the completion of the chipless production process of the tapered roller bearing inner ring 1 , The ring 1 is from the rest of the sheet 3 been separated. Before, after or at the same time, the cylindrical inner surface can be used 7 axially limiting area 15 punched out of the sheet.

The manufacture of a tapered roller bearing outer ring 2 is in the 10 to 15 to see. The sheet 3 is in its undeformed state in 3 to see. It is ring-shaped, ie it has a defined thickness and an outer and an inner diameter.

In a first production step is according to 11 an axially deep drawn area 6 generated, resulting from the plane 5 of the sheet 3 extends in the axial direction. It is remarkable here that the collar-like Durchhalsung 6 is formed so that it extends under the later cone angle α of the tapered roller bearing outer ring in the axial direction, as it turns out 11 evident.

Out 12 It can be seen that subsequently a total of three surfaces are embossed or molded. An unillustrated punch-shaped tool generates the cylindrical inner surface 16 and an axial contact surface 18 , where at the transition of the axial bearing surface 18 to the cylindrical inner surface 16 a sharp transition 19 results. Between the sheet surface and the axial contact surface 18 is a depth t _a provided by which the tool is pressed. Furthermore, by stretching the material a conically shaped portion 17 made, which runs under the cone angle α.

As from the comparison of 12 and 13 shows, in the subsequent manufacturing step, a bending of the tapered roller bearing outer ring 2 around the "pivot point" 28 at the transition from the residual sheet 3 to the tapered roller bearing outer ring 2 in the way that the finished cylindrical surface 16 to the lying below the cone angle α career of the bearing ring 2 becomes; accordingly, the cone-shaped portion 17 bent to the cylindrical surface. The axial contact surface 18 comes so parallel to the plane 5 of the sheet 3 to lie.

Then what happens in 14 is indicated, a separation of the remainder sheet 3 from the so far finished tapered roller bearing outer ring 2 ,

Out 15 shows that, if necessary, still edge cuts 20 or rounding off the ring 2 can be attached.

The bearing rings 1 . 2 are after cutting without further processing soft machining, especially on the tracks subjected. It only follows the hardening and hard finishing of the rings 1 . 2 where the raceways of the rings 1 . 2 may be straight, spherical or logarithmically curved, and also large curvature or radii of curvature can be provided. The tapered rollers used (preferably made of hardened bearing steel) and cages (made of sheet steel or plastic) correspond to the usual designs of tapered roller bearings. With regard to the material, it should be noted that customary measures for refining the material can be used. Corrosion-resistant or corrosion-resistant material and a corrosion-reducing or corrosion-resistant coating including nitriding, carbonitriding, etc. has proved its worth. The classic material for the bearing rings 1 . 2 is bearing steel 100 Cr 6.

1

Tapered roller bearing ring

2

Tapered roller bearing ring

3

annular or disc-shaped sheet

4

radial internal part of the sheet

5

level of the sheet

6

axial deep-drawn area of the sheet

7

cylindrical palm

8th

axial contact surface

9

rounded transition

10

cone-shaped outer surface

11

shoulder

12

Freeway

13

shoulder

14

Freeway

15

limiting Area of the sheet

16

cylindrical palm

17

radial outboard, conical trained section

18

axial contact surface

19

sharp transition

20

edges cut

21

cylindrical outer surface

22

conical palm

23

cylindrical palm

24

conical outer surface

25

cup-shaped depression

26

stamp

27

depression

28

pivot point

t _i

depth

t _a

depth

α

cone angle

Claims (19)

Method for producing at least one tapered roller bearing ring ( 1 . 2 ), characterized in that it comprises the steps of: a) reshaping an annular or disc-shaped sheet ( 3 ) by the radially inner part ( 4 ) of the sheet ( 3 ) out of the plane ( 5 ) of the sheet ( 3 ) is deep-drawn axially; b) forming the at least one tapered roller bearing ring ( 1 . 2 ) at least substantially from the axially deep-drawn area ( 6 ) of the sheet ( 3 ) by forming the axially deep-drawn region ( 6 ) of the sheet ( 3 ); c) separating the at least largely finished molded tapered roller bearing ring ( 1 . 2 ) of the non-axially deep-drawn portion of the sheet ( 3 ). A method according to claim 1, characterized in that the deformation of the disc-shaped sheet ( 3 ) according to step 1) takes place in such a way that the axially deep-drawn region ( 6 ) of the sheet ( 3 ) is cup-shaped. A method according to claim 1 or 2, characterized in that for producing a tapered roller bearing inner ring ( 1 ) carrying out the molding according to step b) according to claim 1 _comprising the step: b _1i ) forming a cylindrical inner surface ( 7 ) in the axially deep-drawn region ( 6 ). Method according to Claim 3, characterized by the method step: b _2i ) molding of an axial bearing surface ( 8th ) extending over the radial region of the tapered roller bearing inner race ( 1 ) and opposite the plane ( 5 ) of the sheet ( 3 ) has a predetermined depth (t _i ). A method according to claim 4, characterized in that in the implementation of step b _2i ) according to claim 4, an at least partially rounded or chamfered transition ( 9 ) from the contact surface ( 8th ) to the cylindrical inner surface ( 7 ) arises. Method according to one of claims 3 to 5, characterized by the method step: b _3i ) stretching of the axially deep-drawn region (FIG. 6 ) with supported inner surface ( 7 ) and possibly supported contact surface ( 8th ), so that a conically shaped outer surface ( 10 ) arises. Method according to claim 6, characterized by the method step: b _4i ) embossing of a cone-shaped outer surface ( 10 ) limiting shoulder ( 11 ) in the non-axially deep-drawn portion of the sheet ( 3 ) adjacent area of the sheet ( 3 ). Method according to claim 7, characterized by the method step: b _4i ') simultaneously with step b _4i according to claim 7: introduction of an undercut ( 12 ) between the conically shaped outer surface ( 10 ) and the shoulder ( 11 ). Method according to one of claims 6 to 8, characterized by the method step: b _5i ) embossing of a cone-shaped outer surface ( 10 ) limiting shoulder ( 13 ) in the non-axially deep-drawn portion of the sheet ( 3 ) removed area of the sheet ( 3 ). Method according to claim 9, characterized by the method step: b _5i ') simultaneously with step b _5i according to claim 9: introduction of an undercut ( 14 ) between the conically shaped outer surface ( 10 ) and the shoulder ( 13 ). Method according to one of claims 3 to 10, characterized by the method step: b _6i ) punching out the cylindrical inner surface ( 7 ) axially delimiting area ( 15 ) of the sheet ( 3 ). A method according to claim 1, characterized in that the deformation of the annular sheet ( 3 ) according to step 1) takes place such that the axially deep-drawn region ( 6 ) substantially below the cone angle (α) of the taper roller bearing ring ( 2 ) from the level ( 5 ) of the sheet ( 3 ) extends axially. A method according to claim 12, characterized in that for producing a tapered roller bearing outer ring ( 2 ) carrying out the molding according to step b) according to claim 1 comprising the step: b _1a ) forming a cylindrical inner surface ( 16 ) in the axially deep-drawn region ( 6 ) with simultaneous support of the radially outer, conically shaped portion ( 17 ) of the deep-drawn area ( 6 ). Method according to claim 13, characterized by the method step: b _2a ) molding of an axial contact surface aligned under the cone angle (α) ( 18 ) extending over the radial region of the tapered roller bearing outer race ( 2 ) and opposite the plane ( 5 ) of the sheet ( 3 ) has a predetermined depth (t _a ). A method according to claim 14, characterized in that in the implementation of step b _2a ) according to claim 14, a largely sharp transition ( 19 ) from the contact surface ( 18 ) to the cylindrical inner surface ( 16 ) arises. Method according to one of claims 13 to 15, characterized by the method step: b _3a ) bending of the formed axially deep-drawn region (FIG. 6 ) around the transition region between the non-axially deep-drawn portion of the sheet ( 3 ) and the axially deep-drawn portion of the sheet ( 3 ), so that the manufactured cylindrical inner surface ( 16 ) assumes a conical shape that runs below the cone angle (α), and that the radially outer, conically shaped portion ( 17 ) assumes a cylindrical shape. Method according to one of claims 1 to 16, characterized in that after the separation of the at least largely finished molded tapered roller bearing ring ( 1 . 2 ) of the non-axially deep-drawn portion of the sheet ( 3 ) according to step c) according to claim 1 at desired edges of the manufactured tapered roller bearing ring ( 1 . 2 ) Edge cuts ( 20 ). Method according to one of claims 1 to 17, characterized in that after the separation of the at least largely finished molded tapered roller bearing ring ( 1 . 2 ) hardening of the tapered roller bearing ring ( 1 . 2 ) he follows. A method according to claim 18, characterized in that after hardening a grinding and / or honing of the tapered roller bearing ring ( 1 . 2 ) he follows.