DE2336826A1 - METHOD AND DEVICE FOR MACHINING WORKPIECES - Google Patents

Description

Method and device for processing workpieces.

The invention relates to a method and a device for processing workpieces and in particular for production several surfaces on the circumference of a rotating workpiece, for example on one facing outwards expanding shaft of an insert.

In US Pat. No. 3,399,4o9, a method is already described in which one by upsetting or cold forging End of a shaft of a socket is formed. This shaft is polygonal and provided with flat side surfaces, tending to bulge outward at the outer end portion of the shaft. Although the known procedure for the production of sockets is essentially satisfied, occur in the formation of relative

403807/036 / »

Patent attorneys Dipl.-Ing. Martin Licht, Dipf.-Wirtsch.-Ing. Axel Hansmann, Dipl.-Phys. Sebastian Herrmann

small stakes still cause problems. These problems arise due to the fact that there are no sockets relatively difficult to handle and have very small shafts that are difficult to achieve precisely and bring it into the desired shape in an economical way.

Attempts have already been made to address this problem which occurs in the manufacture of relatively small sockets economical way to solve, wherein, as described in US-PS 3,399 4oS, on the shaft of a rotating Use with a blade knife or fly knife outwardly widening side surfaces were formed. Due to the high relative movement, however, which takes place between this fly knife and the shaft, the fly knife became relatively shorter Time dull or burned out. The undercut or The extension configuration of the shank of the insert makes it difficult to access the shank by moving a tool to produce flat side surfaces along the shaft in the axial direction with a reciprocating cutting process.

The object of the invention is therefore to provide a new and improved method and an associated device to create multiple surfaces on the circumference of a rotating workpiece, this The method and its device are particularly advantageous for producing flat surfaces on the shaft of an insert should be used. First of all, a shaft with an approximately circular cross-sectional shape should be created * which widens outwards, whereupon this shaft receives a non-circular cross-sectional shape when it is rotated will. Furthermore, a workpiece is therefore to be produced in this context, on an arc of a circle

409807/0364

arranged, curved segments of a forming roller is pressed against the workpiece when this is set in rotation in order to produce several surfaces on the workpiece «

Furthermore, with the help of the inventive Method and the associated device several axially extending flat surfaces on In this way, produce the circumference of a rotating workpiece let the surface of the rotating workpiece be brought into engagement with a rotating form roller. The tool used should consist of a rotatable forming roller and a drive roller, which with the forming roller is connected and transmits driving forces from the rotating workpiece to the forming roller around its To set the central axis in rotation, the Formrails curved with a row lying on an arc of a circle or curved segments should be provided on the rotating workpiece during the rotary movement of the Formrolls to create multiple surfaces.

For this purpose, the inventive method and its implementation device designed so that on the shaft of the insert byph cold deformation of the shank, while it is set in rotation by the chuck of a lathe, flat, axially Surfaces that are to be expanded towards the outside are formed »This cold deformation is carried out with the aid of curved segments which are arranged in a hanging on the circumference of a forming roller. The forming roll is from rotated by a drive roller, which is itself set in rotation by engagement with the rotating workpiece. Although it is desirable in the present case, the shank of a socket insert with a flat, outwardly To provide surfaces to be expanded, of course, concave or convex surfaces on the

409807 / O3S4

INSPECTED

2336828

Shank of the insert can be made, if so required, by adding dBr radius of curvature to the curved one Segments is changed. Although the method described here and the associated device are particularly good for producing outwardly expanding surfaces on the shaft of an insert they could also be used to edit many other elements.

The invention is illustrated below with reference to the drawing illustrated embodiments explained in more detail. In the drawing show:

Figure 1 is a pictorial view of a plug insert with a shaft part with flat side surfaces, the can be produced with the aid of the method described here and the associated device.

Figure 2 is a sectional view along the line 2-2 in Figure 1, involving the engagement of the flat surfaces of the shank of the insert in a receiving plate or shows a sheet metal body,

FIG. 3 shows a schematic representation of the manner in which the flat, outwardly widening is produced Surfaces on the rotating shaft of an insert with the help of a molding tool here described type,

Figure 4 is a side view along the line 4-4 in Figure 3, showing the relationship between the molding tool and the shaft of the insert can be seen.

Figure 5 is an enlarged, pictorial representation of the mold, showing the relationship between drive

409807/0364

and forming rolls shows

Figure B is a plan view along the line 6-6 in Figure 3; from which the configuration of the forming roller can be seen,

Figure 7 is a sectional view along the line 7-7 in Figure 6, which shows the relationship between form and drive rollers,

Figure 6 is an enlarged plan view taken along line 8-8 in Figure 7, from which the configuration of the curved segments can be seen, which on a ring the surface of the forming roller are arranged, and

Figure 9 is an enlarged plan view taken along line 9-9. in Figure 7, from which the shape of several teeth can be seen in a ring on the circumferential surface the drive roller are arranged.

A socket or a nut 1o that with this here described method and the associated device is produced, has a cylindrical head 12 and a outwardly protruding shaft 14, which has a polygonal cross-sectional shape, as can be seen from FIG. A cut central opening 16 extends through the insert 1o and is internally threaded, the one with the external thread of a screw or another Body can be engaged. If the insert 1o is to be used as a bearing or support element, can the thread 16 can be omitted.

If the insert 1o in a plate or a sheet metal body 18 is installed, it acts like its own punch to make a hole in the plate. The stake 1o is therefore by a ram or some other tool

409807/0364

233682Θ

pressed against the plate 18 to thereby cause a tapered front end portion 2o of the shaft 14, punch a circular hole 22 in the plate. When this happens, the shaft 14 enters the hole 22, and the head 12 exerts a compressive force on the metal of the plate 18 from which the metal with the flat, outwardly diverging side surfaces 24 of the shaft brings into close contact.

The flat surfaces 24 of the polygonal shaft 14 engage the metal plate 18 and prevent one Rotational movement of the insert 1o in the hole 22. The flat Surfaces 24 extend axially between the inner and outer end portions of the shaft 14. The flat surfaces lie in transversely extending planes which extend in a radial direction through the shaft 14 of the Cut the insert 1o running level (Figure 2). The general shape of the insert 1o and the way in which this insert cooperates with the plate 18 are discussed in more detail in US Pat. No. 3,399,705 and are therefore not specified here in detail.

According to the invention, the insert is now produced on a known lathe which has a chuck 28 which a piece of a base material rod 3o rotates (Figure 3). A blank 34 with a cylindrical head 36 and a frustoconical shaft 38, which correspond to the head 12 and the shaft 14 of the insert 1o, is on the outer or the front end of the base material rod 3o made with known tools. The flat side surfaces 24 are then produced on the shaft 38 with a molding tool 42.

The molding tool 42 has a circular molding roller 46 which is rotated by a round drive roller 48

-7- 2336828

is moved. The drive roller 48 is rotated by it comes into contact with the rotating base material rod 3o. When the forming roller 46 from the drive roller 48 is set in rotation, deform curved segments 52, which are arranged in a circular ring on a serrated shaping surface 54 [see Figures 3, 4 and 5} are arranged, the shaft 38 by a cold forming process, so that the flat surfaces 24 are formed.

When the flat surfaces 24 are curled or rolled on the round shaft portion 38 of the blank 34, the forming tool 42 is replaced by a suitable cross slide or another existing on the lathe Device 58 moved in the radial direction inward against the blank. When the mold 42 is in the direction of Moved onto the blank 34, the drive roller 48 is provided with an annular bottom or inner surface 62 a groove 64 on the inner end of the head of the blank engaged (Figure 3). The blank 34 of the As chuck 28 is rotated, drive roller 48 is rotated by engagement with the blank. The rotational movement of the drive roller 48 is applied to the forming roller 46 through connecting screws 68 and pins 7o (Figures 6 and 7) that hold the drive roller in place connect with the forming roller.

If the forming roller 46 is moved further inward, a ridge or crown part 76 (FIG. 8) of one of the curved segments 52 with a frustoconical outer Surface 78 of shaft 38 (Figure 3) in pressure contact. At this moment the forming roller 46 is released from the drive roller 48 rotated in a direction opposite to the direction of rotation of the base material rod 34. For example 4, the form roller 46 rotates under the action of the drive roller 48 in a clockwise direction, while the base material rod 3o of the chuck 28 counterclockwise

is rotated. Therefore, a crown 76 moves in a curved manner Segment 52 in the same direction as surface 78 of shaft 38 while engaged.

The speeds of the engaged Portions of the surface 78 and crown 76 are substantially the same as the forming roller 46 is approximately the same Has the same diameter as the drive roller 48 (see Figures and 7).

Due to the relative rotation between the shaft 38 and of the forming roller 46, the crown 76 of each of the curved segments 52 is successively connected to the surface 78 of the Shank brought into engagement. This creates a plurality of flat indentations around the circumference of the shaft 38. Initially, the crowns 76 of the curved segments 52 align with the outer surface 78 of the shaft 38 barely touched. Therefore, each of the flat indentations formed by the curved segments 52 be, at the beginning a very small length in the circumferential direction, and the individual impressions are from each other separated by an arc of a circle formed by part of the shaft surface 78. Although the flat ones Impressions or spots that initially have a very small circumferential extension are the curved segments 52 inclined or beveled inwardly at the same angle as the surface 78 of the shaft 38 (see Figure 3), so that each flat impression extends from the head 36 of the blank 34 to one in the radial direction outer end face 8o of the blank extends.

The circumferential extent of each flat indentation in the frusto-conical surface 78 of the shaft 38 arises, increases when the movement of the forming roller 46 in the radial direction inward against the Central axis 84 continues around which the base material rod

405807/0364

- 9 - 2336825

is rotated by the chuck 28 (Figure 3). if the curved segments 52 causing the forming process in the direction of the center of the rotary movement of the blank 34 are moved inwardly, the degree of engagement of the arcuate segments also increases into the frusto-conical surface 78 of the shaft 38, whereby the circumferential extent of each flat impression increases accordingly and a reduction in size the length of the circular segments of the surface 78 takes place between these impressions. As the forming roller 46 moves further inward, it increases in size the circumferential extension or length of the flat impressions until the flat side surfaces 24 [Figure 1) on the shaft 38 of the blank 34 are completely formed. If requested, the internal Movement of the forming roller 46 with a larger arcuate distance between them in the longitudinal direction extending side portions of the flat surfaces 24 are brought to a standstill.

The fully formed flat surfaces 24 extend extending from a bottom surface 84 of the head 36 to the frontal surface 8o of the shaft 38. To the flat Surfaces 24 to allow the entire length of shaft surface 78 to form are arcuate Segments 52 are shaped around axes that nadn inwardly towards the center of rotation of the Tilt the forming roller 46 at the same angle as the surface 78 of the shaft 38 in the direction of the axis of rotation 84 of the blank 34 is inclined inwardly. Therefore, each of the curved forming or working surfaces on the segments 52 extend from the head 36 of the blank 34 outwards at the same angle as the surface 78 of the shaft 38, so that between the curved segments and the surface 78 of the shaft 38 over the entire axial length of the shaft is engaged

40Ö8O7 / Ö36A

- ίο -

233682Θ

takes place C see Figure 3). This creates flat ones Surfaces 24 having an approximately trapezoidal configuration with one of the parallel sides next to the annular bottom surface 84 of the head 43 and the other parallel side on the end face Bo lie. It should be noted, however, that these flat surfaces are not exactly trapezoidal, since the center of the shaft 38 tends to calibrate slightly to deform outwardly towards the end face 8o when the flat surfaces are in the shank getting produced.

The curved segments 52 (FIG. 8) are shaped in such a way that the side surfaces 24 (FIG. 1) on the shaft 14 of the insert 1o are flat and form chords of a circle of larger diameter that circumscribes the shaft as well as tangents to a circle having a smaller diameter inscribed in the surfaces 24 is. However, the shape of the curved segments 52 can be changed to thereby change the configuration of the surfaces 24 so that they do not have the flat shape shown in FIGS. So could the curved segments 52, for example, be bent outwards with reference to the shape shown in FIG. 8, so that sine with Recessed or concave surface 24 in the shaft 14 of the insert 1o arises. By reducing the extent to which, based on Figure 8, the curved Segments 52 curve outwards, the surfaces 24 give a convex configuration.

It should be noted that the frustoconical The surface 78 of the shaft 38 (FIG. 3) tends outward from the head 36 to the end face 8odes of the shaft.

The flat surfaces formed by the forming roller 46 in the shaft 38 ′ also strive outwards from the head to the end face 8o. This undercut

409807/0364

or the outwardly flaring configuration of the shaft 38 makes it extremely difficult when not at all impossible to produce the flat surfaces by using a tool in the axial direction on the frustoconical surface 78 of the shaft is moved along. If a rotary flyer is used to cut the flat surfaces 24 on the To produce a frustoconical shank 3Θ, then the speed of movement of the cutting edge of the knife so large that the blade becomes dull or burns out after a relatively small number Inserts have been made with the knife. Since the outer surfaces of the curved segments 52 are on Forming roller 46 are beveled inwards at the same angle at which the shaft 38 extends outwards expanded, the forming roller can be moved radially inward, i. e. that is, in a direction perpendicular to the axis of rotation 84 of the blank 34, around the outwardly widening or diverging, flat surfaces train on dsm shaft. Therefore, the forming roller 46 is only subjected to radially directed compressive forces, when the flat surfaces 24 are cold forged or machined into the surface 78 of the shaft 38 so that the forming roller has a relatively long service life.

The drive roller 48 is driven by the rotating base material rod 3o. To between the base material bar 3o and the drive roller 48 * to produce an inevitable, driving engagement, a ring of teeth 9o (Figures 5 and 9) is formed on the circumference of the drive roller 48, The teeth 9o penetrate the annular bottom surface 62 (Figure 3) of the groove 64 when the cross slide (58) the drive roller (48) and the forming roller 46 in the radial direction inwards on the axis of rotation 84 of the base material stabs 3o too moved. This interference causes a compulsory

4Q98Q7 / 0364

2336828

running or positive drive connection between the base material rod 3o and the roller 4Θ.

When the tool 42 moves inwardly towards the axis of rotation 64 of the base material rod 3o to the Forming roller 46 to enable the circumferential length of the flat Increasing surfaces 24 formed on the shaft 3B also increases the depth to which the Teeth 9o penetrate the surface 62 of the base material rod 3o. So when the tool 42 is initially in Is moved towards the rotating base material rod 3o, the tips 94 (Figure 9) of the teeth 9D with the annular bottom surfaces of the groove 64 (Figure 3) engaged before the crowns S6 dBr curved segments 52 in engagement with the upper surface 78 of the shaft 3B step. As the drive roller 48 continues to move inward, the tips 94 of FIG Teeth 9o penetrate into the surface 62 (see FIG. 9) or deepen this surface, thereby creating an inevitable To effect engagement of the drive roller with the rotating base material rod 3o. At this point it is the forming roller 46 has just made contact with the surface 78 of the shaft 38. If so then the molding tool 42 is moved further inward, the extent to which the teeth 9o engage in the base rod increases 3o dig in, as well as the strength of the pressure contact between the forming roller 46 and the shaft 38.

The teeth 9o are dimensioned so that the root or bottom part 98 of the teeth is not closer to the base material rod 3o comes into contact, fca / or the formation of the flat surfaces 24 has been completed by the forming roller 46. When the space between the adjacent teeth is 9o with Metal fills before the formation of the flat surfaces 24 on the shaft 38 has been completed, then the metal between the teeth 9o block the further inward movement of the drive roller 48. This would make the

409807/0364

RoIIb 46 prevented from moving further inward to form the flat surfaces 24 completely. The teeth 9o are therefore provided with tooth flank surfaces which are arranged at right angles, whereby they better disengaged from the base material rod 3ό can be.

The drive roller 4B and the forming roller 46 are on one common supporting wall or axis 1o2 rotatably mounted. The axis 102 extends between a pair of arms 1o4 and 1o6 (see Figures 3 and 5) of a bearing support 1oB. The bearing support 1oB stands by a shaft 1.1o with a cross slide 5B in connection (see Figure 3 and 4) and is secured against relative rotation with respect to the cross slide 5B by a locking pin 112. Although the bearing support 1oB in the drawing is special Has shape, this shape is not mandatory, but other shapes can be used and also other mounting options on a suitable carrier, like the Q'uersch suffered 58 represents are conceivable so that the bearing support can move with respect to the base material rod 3o.

When the flat surfaces 24 in a shaft 38 completely have been formed, the cross slide 58 is conveyed away from the base material rod 3o in order to thereby to disengage the drive roller 48 and the forming roller 46 from the blank 34. The beveled one; front end part 2q "(Figure 1) of the insert 1o is then with a suitable shaping or cutting tool 116 (Fig

3) on the axially outer end part of the shaft 38 manufactured. The blank 34 is then removed from the base material rod with a cutting or separating tool 12a 3o separated.

The cutting or parting tool 12o also serves to create the groove during the initial shaping of the blank 34

409807 / 0.364

to produce. The drive rollers 48 has a thickness that is slightly less than the thickness of the cutting tool 12o, and the teeth 9o on the drive roller can be bring with the bottom 62 of the groove 64 in contact. There the drive roller 46 and the cutting tool 12o have substantially the same thickness, the needs Groove 64 does not necessarily have to be enlarged on the base material rod 3o, thereby wasting material is avoided.

After the blank 34 has been cut from the end of the raw material rod 3o, a cylindrical, central passage 124 rubbed and cut, so that the central opening 16 is formed and the Production of the insert 1o is thus complete. The central passage 124 is made in the base material rod 3o drilled before the blank 34 is subjected to the deformation, because the drilling of the single hole in a long piece of the base rod is easier than arranging and making a hole in each of the numerous small inserts 1o that have been formed from the base material rod. However, it is necessary to have the passage 124 to be reamed open before cutting or drilling, since the opening is due to the action acting on the shaft 3B Forces when the flat surfaces 24 are made by the forming roller 46 easily becomes out of round. Dependent on the central opening 16 is also not cut from the purpose for which the use is intended.

The drive roller 48 and the forming roller 46 are in one Distance axially separated from one another, which is equal to the axial thickness of the head 36 of the blank 34. In this way is that between an inside 128 extending in the radial direction of the drive roller 48 and an inside inner side 13o of the forming roller 46 extending in the radial direction is equal to the axial length of the head 36 (FIG. 3).

409807/0364 orjqinal inspected

Of course, the distance between the annular surfaces 128 and 13o changes with the size of the head 12 and the insert to. In addition, the axial inclination of the arcuate segments 52 of the forming roller 46 and the axial length of the arcuate segments can change with the size of the insert 1o. It will be appreciated that the inclination of the surface has been of the shaft 38 and the arc-shaped segments shown 78 52 in the drawing figures 3 and 4 exaggerated for clarity, and that these parts have a relatively low tendency as un from the figures B & can be seen.

From the above it follows that according to the invention a method and apparatus for producing multiple surfaces on the periphery of a rotating workpiece. Although the method described and the associated device for the production of many different Objects can be used, their application has in particular for the production of the insert 1o on a lathe, proven. During the manufacture of the insert Io, the forming roller 46 is standing with the shaft expanding outwards 38 of the blank 34 and forms a plurality of outwardly beveled flat surfaces on the circumference of the shaft. Although the curved segments 52 on the forming roller 46 are shaped so that the flat surfaces 24 on the Circumference of the shaft 38 can be formed, these arcuate segments can of course be shaped so that the surfaces created by them have a different shape, so are not flat, as shown in the drawing.

When the flat surfaces 24 on the outside widening shaft 38 are formed, the forming roller 46 set in rotation by the drive roller 48. The drive roller itself is rotated by the fact that it engages with the rotating base material rod 3o. When the forming roller 46 is turned from the drive roller 48.

409807/0364

the bent segments 52 on the forming roller are pressed against the rotating shaft 38 to thereby to produce the flat surfaces 24 on the shaft by cold working.

409807/0364

Claims (1)

Claims M. ^ Process for the production of workpieces, in particular an insert that is in a in a plate or in a Sheet metal existing hole can be arranged and a head part as well as an outwardly widening shaft which can be received by the hole and via at least one Part of its length has a non-circular cross-section, which prevents the shaft from rotating in the hole, thereby characterized in that a lengthwise extending piece of material is produced that the head part of the insert is formed from this fiaterialsMJck, that the piece of material is rotated about its longitudinal axis and the outwardly widening shaft of the insert is formed from the piece of material, the shaft with an axially extending, outer end portion is provided, which is separated from the head part of the insert at a distance and a first circular cross-section which is coaxial with the longitudinal axis of the piece of material in a first radial plane that is perpendicular extends to the longitudinal axis of the piece of material, whereupon the shaft with an axially inner end part is provided, which is located next to the head part of the insert and has a second circular cross-section, which is smaller than the first circular cross section and coaxial to the longitudinal axis of the piece of material in a second Radial plane that extends perpendicular to the longitudinal axis of the piece of material, after which the shaft during the rotational movement of the piece of material about its longitudinal axis is further formed by several outwardly striving surfaces are generated which extend transversely to one another and at least in part lie between the inner and outer end portions of the shaft, with the creation of several outwardly striving Surfaces on the shaft of the first circular cross-section at the outer end portion of the shaft to one first non-circular cross-section is deformed when 409807/0364 233682Θ the piece of material is set in rotation while the second circular cross-section at the inner end portion of the shaft to a second non-circular cross-section is deformed when the piece of material is rotated which is smaller than the first non-circular cross-section. 2. The method according to claim 1, characterized in that the production of the first and second non-circular cross-sections during the rotational movement of the piece of material includes making a plurality of flat surfaces axially from the inner end portion of the shaft strive out to the outer shaft end part. 3. ' Method according to claim 1, characterized in that when the shaft is provided with axially outer and inner end portions, the first and one have a second circular cross-section, at least a part of the shaft is given its frustoconical shape, which is located between the inner and the outer end part of the Shaft extends and has its base on the outer shaft end portion. 4. The method according to claim 1, characterized in that in the formation of the first and second non-circular Cross-section, the cross-sections are given a polygonal configuration. 5. The method according to claim 1, characterized in that a tool is created which has a round drive roller and a round forming roll that in manufacture the first and the second non-circular cross-section during the rotational movement of the piece of material, the round drive roller is pressed against the rotating piece of material at a point which is in aial direction from the shaft of the insert is separated to thereby the drive roller 409807/0364 233.6828 under the action of the rotating piece of material to put forces transmitted to them in rotation, and that under the action of the drive roller the forces transmitted to the forming roller, the latter rotates, pressing it against the shaft of the insert. B. The method according to claim 5, characterized in that an annular groove in the formation of the head part of the insert in the piece of material next to one end of the head part is formed, which is turned away from the shaft of the insert, and that the round drive roller against the rotating Piece of material is pressed, the circular peripheral surface the drive roller is pressed against an inner surface of the annular groove. 7. The method according to claim 1, characterized in that in the manufacture of the first and the second non-round Cross-sectional area during the rotational movement of the piece of material at the same time cold deformation of the inner and of the outer end portion of the shaft takes place. B. The method according to claim 1, characterized in that a forming roller is created, which has an approximately circular machining surface on which several bent at . gene segments are formed, the manufacture of the the first and the second non-circular cross-sectional area during the rotational movement of the workpiece, the machining surface of the Form roller is pressed against the shaft of the insert and by the pressure contact of the curved segments on the Shank of the insert several outwardly striving surfaces are formed. 9. The method according to any one of claims 5-8, characterized in that that a tool is created which has an approximately circular drive roller and a forming roller, which has an approximately circular machining surface that 409807/0364 is formed at least in part by a ring of curved segments, the center of which is in a radial direction lie outside the center of the forming roller, that a workpiece is rotated about its central axis, that the drive roller is pressed against the rotating workpiece, thereby under the action of the on the Drive roller from the rotating workpiece to set forces in rotation that the forming roller under the action of the forces transmitted to it by the drive roller is set in rotation, and that on the rotating workpiece several surfaces are formed, which extend in the axial direction of the workpiece and lie in planes which intersect with each other in a radial plane that is perpendicular to The axis of rotation of the workpiece runs by placing the curved segments one behind the other on the rotating forming roller be pressed against the rotating workpiece. 1o. Method according to claim 9, characterized in that on the rotating workpiece prior to formation the individual surfaces on the workpiece outwardly protruding part is formed, whereby this outwardly facing part is provided with an end part, which has a first round cross section which is arranged coaxially to the central axis of the workpiece and lies in a first radial plane which extends perpendicular to the central axis of the rotating workpiece, as well as being provided with a second end portion having a second circular cross-section which is smaller than the first round cross section and which is arranged coaxially to the central axis of the rotating workpiece and lies in a second radial plane which extends perpendicular to the central axis of the rotating workpiece, whereupon the individual surfaces are formed on the rotating workpiece in that the first round cross-section at the first end part with the curved 409807/0364 233682Θ Genen segments of the forming role in a first not round cross-section is deformed when the workpiece rotates about its central axis, and that the second round cross-section at the second end part with the curved segments of the form rolls in a second non-round Cross-section is deformed, which is smaller than the first non-circular cross-section as soon as the workpiece rotates. 11. The method according to claim 9, characterized in that the drive roller is provided with several teeth, which are arranged in an annular row, and that when pressing the drive roller against the rotating Workpiece formed with the teeth located on the drive roller in the rotating workpiece recesses so that there is a positive drive between the rotating workpiece and the drive roller is created. 12. The method according to claim 11, characterized in that both the forming roller and the drive roller in Direction of the central axis of the workpiece are moved to thereby extend the circumferential extent on the rotating workpiece of the surfaces formed by the curved segments of the forming roller and also Increase the depth to which the teeth on the drive roller dig into the workpiece. 13. The method according to claim 9, characterized in that in the production of several surfaces on dam workpiece multiple flat surfaces can be formed. 14. The method according to claim 13, characterized in that the successive pressing of the rotating on the The curved segments located on the rotating workpiece form the annular series of curved segments 409807/0364 Segments is moved in the radial direction towards the central axis of the rotating workpiece. 15. Device for producing multiple surfaces on a rotating workpiece according to the method according to one of claims 1 - 14, characterized in that the device is a rotatable forming roller (46) and a drive roller (4B) connected to the forming roller in order to be driven by the rotating one Workpiece (3o) to transmit drive forces to the forming roller (46) and thereby the forming roller about its central axis to set in rotation, and that the forming roller (4B) comprises an annular series of curved segments (52) each of which has a deformation surface (54) has several surfaces with which during the rotary movement of the forming roller on the rotating workpiece (3o) (24) can be generated. 16. The device according to claim 15, characterized in that that the deformation surface (54) of the curved segments (52) on the rotating workpiece (3o) several produces flat surfaces (24) which extend in the axial direction along the workpiece and in There are planes that intersect one another in a radial plane that is perpendicular to the axis of rotation of the workpiece (3o) runs. 17. The device according to claim 16, characterized in that that the deformation surface (54) on each of the curved Segments (52) lies in a curved plane which extends transversely to the axis of rotation of the forming roller (46), in order to thereby form flat, outwardly projecting surfaces (24) on the workpiece (3o). 15. Apparatus according to claim 15, characterized in that that the drive roller (48) has an annular row of teeth 409807/0364 (9o) which dig into the workpiece C3o) and rotational forces between the workpiece and the drive roller transfer. 19. Device according to claims 15-18, characterized by a chuck (28) with which the workpiece (3o) is rotatable about its central axis, a forming roller (46) through which several surfaces (24) on the circumference a workpiece (3o), which extend in the axial direction of the workpiece, can be produced if the The workpiece (3o) is set in rotation by the chuck (28), these surfaces (24) lying in planes, which intersect each other in a plane which is perpendicular to the central axis of the workpiece (3o), that the forming roller (46) has a drive roller (48), which can be brought into engagement with the workpiece (3o) when this is set in rotation by the chuck, thereby rotating the drive roller around its To generate the central axis at a speed that depends on the speed at which the chuck (28) the workpiece rotates so that the forming roller is arranged coaxially to the drive roller in order to have several on the workpiece (3o) To form surfaces (24) when the workpiece is rotated by the chuck that Hemen.te (68; 7o) present are that the shaped thread (46) with the drive roller (48) connect to make the forming roller rotate at the same speed as the drive roller, under the action of the device from the rotating workpiece (3o) with the help of the drive roller (48) transmitted forces that the forming roller has an approximately circular body, as well as a device (42, 58), by which this body is rotatably supported about its central axis, that on the circumference of the body (14) an annular series of arcuate segments (52) each having an arcuate deformation surface (54) forms successively with the workpiece (3o) in 409807/0364 Can be engaged while the workpiece is being rotated by the chuck (2B) and the forming roller (46) is set in rotation by the drive roller (48), in order to thereby on the workpiece Qd) by cold working with the help of the curved deformation surface (54) several Form surfaces (24). 20. Apparatus according to claim 19, characterized in that that the curved deformation surface (54) is shaped so that the individual surfaces (24) on the workpiece during the rotary movement of the by cbs chuck (28) Workpiece (3o) and the rotary movement cfer forming roller (46) get a flat design with the help of the drive roller (48). 21. The device according to claim 19, characterized in that the deformation surface (54) has an outer part (76) has, with which a first non-circular cross-section can be given to a first section of the workpiece (3o), which in a first plane that extends perpendicular to the central axis of the workpiece, and that the deformation surface has an inner part through which a second part of the workpiece (3o) is provided with a second non-circular cross-section which is larger than the first non-circular cross-section and lies in a second plane that is perpendicular extends to the central axis of the workpiece (3o). 22. The apparatus according to claim 19, characterized in that the drive roller (48) has an annular row of teeth (9o) which dig into the rotating workpiece (3o), thereby between the workpiece and the drive roller to create a non-positive or positive drive connection. 409807/0364