EP1699591B1 - Rolling device of a rolling mill for crankshafts - Google Patents

Description

The invention relates to a deep rolling machine of a deep rolling machine for crankshafts, with two opposing arms, of which one arm carries a deep rolling head and the other arm a support roller head, wherein the support roller head is provided with two axially parallel support rollers and the deep rolling head with at least one deep rolling roller whose Rotary axis with the axis of rotation of the crankshaft lies in a plane and forms an angle with it, with a drive device which generates the closing and opening movement of the deep rolling device and the deep rolling force.

A deep rolling device of the type mentioned is known for example from the DE 299 10 214 U1 and the DE 202 00 926 U1 , In both cases, there are deep-rolling equipment, which have facilities that should avoid collision of the tools with the oil collars of the journals of the crankshaft when closing the deep rolling equipment. Typically, in a deep rolling roller head, two fixed rollers are arranged in a paired manner at a mutual distance from each other, which penetrate under the action of the deep rolling force in the radii or recesses between the bearing pin and the cheeks of the crankshaft, while the crankshaft rotates about its axis of rotation. The axes of rotation of the two fixed rollers each extend in a plane to the axis of rotation of the crankshaft or have a small offset relative to the axis of rotation of the crankshaft. With respect to the deep rolling head, the deep rolling rolls are tilted outwardly and include in this arrangement with the axis of rotation of the crankshaft an acute angle.

The two deep-rolling rollers are supported within the deep rolling roller head on a guide roller which is mounted in the deep rolling roller head so that it can not take over forces in the longitudinal direction of the crankshaft.

Support roller heads can develop forces in the axial direction, for example, if the axis of one of the two support rollers of a support roller head is not strictly parallel to the axis of rotation of the crankshaft. In addition, it may be alignment errors of the deep rolling mill, blow of the crankshaft, conical bearing surfaces of the respective main or connecting rod bearing, which forces in the axial direction, i. in the direction of the axis of rotation of the crankshaft, which are undesirable in terms of a clean work result and whose size depends on the height of the deep rolling force and the prevailing friction conditions.

This results in the object for the invention to provide a guide device which is adapted to catch emerging from the deep rolling or emerging on the deep rolling tool forces in the axial direction and to improve in this way the processing result of deep rolling on the crankshaft.

According to the invention this object is achieved in that in an embodiment of the deep rolling device in scissors construction on the deep rolling head an axial guide roller is provided according to claims 1 or 2.

Since the prevailing space conditions usually do not allow a vertical arrangement of the Axialführungsrolle with respect to the axis of rotation of the crankshaft, is provided according to a further advantageous embodiment, that the axis of rotation of the Axialführungsrolle with a plane containing the axis of rotation of the crankshaft and the common plane of the axes of rotation both support rollers are at a distance and parallel, enclosing an acute angle. In both embodiments, therefore, an axial guide roller is fixedly arranged on the deep rolling roller head or on the yoke, which limits an axial movement of the deep rolling device in the longitudinal direction of the axis of rotation of the crankshaft and initiates forces acting in the same direction in the oil collar of the crankshaft. The arrangement of the Axialführungsrolle under an acute angle does not affect the space within the deep rolling machine, the for axial displacement of the crankshaft may be required. Rather, the arrangement leaves a space at the top, which is sufficiently large to serve as an access space for a probe, which measures in a known manner the concentricity of the crankshaft before and after the deep rolling.

Instead of a single Axialführungsrolle a pair of axial guide rollers is provided, the axes of rotation parallel to each other and have a distance. But also the possibility is provided that the axes of rotation of a pair of axial guide rollers have an offset, viewed from an angle perpendicular to the axis of rotation of the crankshaft. Instead of Axialführungsrollen but, as is well known, sliding body may be provided.

Followings, the invention will be described in more detail in two embodiments.

• Fig. 1 einen Schnitt durch eine Festwalzmaschine mit einer Teilansicht einer Kurbelwellentransportvorrichtung, wobei ein Festwalzgerät seine Vorschließstellung gegenüber einer eingebrachten Kurbelwelle einnimmt,
• Fig. 2 einen Schnitt durch die Festwalzmaschine und einen Schnitt durch einen Hauptlagerzapfen der Kurbelwelle, wobei das Festwalzgerät in seiner Schließstellung ist.
• Fig. 3 einen Schnitt entsprechend der Linie IV-IV der Fig. 4,
• Fig. 4 die Axialführungsrolle an einem Festwalzgerät, welches in Scherenbauweise ausgestaltet ist,
• Fig. 5 den Querschnitt durch einen Festwalzrollenkopf,
• Fig. 6 das Kräfteparallelogramm von ausgeglichenen Axialkräften,
• Fig. 7 das Kräfteparallelogramm von nicht ausgeglichenen Axialkräften und
• Fig. 8 eine zweite Ausführungsform eines Festwalzgeräts.

It show the

• Fig. 1 a section through a deep rolling machine with a partial view of a crankshaft transport device, wherein a deep rolling machine assumes its Vorschließstellung against an inserted crankshaft,
• Fig. 2 a section through the deep rolling machine and a section through a main journal of the crankshaft, wherein the deep rolling machine is in its closed position.
• Fig. 3 a section corresponding to the line IV-IV of Fig. 4 .
• Fig. 4 the axial guide roller on a deep rolling device, which is designed in scissors construction,
• Fig. 5 the cross section through a deep rolling roller head,
• Fig. 6 the parallelogram of balanced axial forces,
• Fig. 7 the parallelogram of forces of unbalanced axial forces and
• Fig. 8 a second embodiment of a deep rolling machine.

A deep rolling machine 1 is provided with a driving device (not shown) which serves to receive a crankshaft 3 provided with a crankshaft conveying device 2.

The drive device generates the rotational movement of the crankshaft 3 about its axis of rotation 4 during the deep rolling of the main shaft 6 and pin bearing pin 5. The axis of rotation 4 is thus in the axis of rotation of the drive device.

The present embodiment is focused on the deep rolling of a crank pin 5 of the crankshaft 3, since this is sufficient to explain the subject invention. The crankpin 5 is associated with a deep rolling machine 8, which is provided in scissors construction with two arms 9,10, a shearing pivot 11, a drive device 12, a deep rolling head 13 and a support roller head 14. The drive device 12 has an adjusting cylinder 15 and a power unit 16. The adjusting cylinder 15 generates the closing and

Opening movement of the deep rolling unit 8, the power unit 16, the deep rolling force 39. The deep rolling unit 8 is pivotable about an axis 18 to a pivotable about an axis 18 Angle lever 19 articulated. The angle lever 19 can be pivoted by means of a piston-cylinder unit 20.

The deep rolling machine 1 is designed so that when closing the deep rolling machine 8, the two axially parallel support rollers 21, 22 of the support roller head 14 and then the two fixed rollers 23, 24 of the deep rolling roller 13 come to the crankpins 5 to the plant.

In this case, the support roller head 14 performs a pivoting movement 35 about the pivot point 17 and the deep rolling roller head 13 a pivoting movement 36 about the shear pivot point 11.

In the pivoting movements 35 and 36 of the support roller 14 and the deep rolling roller head 13 in the closing sense, a collision with one of the two oil bundles 25, 26 of the pin bearing pin 5 is avoided in that the deep rolling roller head 13 a transversely and centrally to the support rollers 21, 22 arranged Axialführungrolle 27, whose diameter 28 is greater than the width 29 of the deep rolling roller head 13 and slightly smaller than the mutual distance 29 a of the oil bundles 25, 26 of the crank pin 5.

The axial guide roller 27 is cylindrical outside. In the closed position of the deep rolling machine 8 ( FIG. 2 ) are provided for the two free spaces 30, 31 between the oil coils 25, 26 and the axial guide roller 27 individually about 0.25 mm game.

The axes of rotation 32 and 33 of the two support rollers 21 and 22 lie in a common plane 34, which leads to a plane 38 which the axis of rotation 4 of the crankshaft. 3 contains, has a distance s. The axis of rotation 7 of the axial guide roller 27 closes with the plane 38, which contains the axis of rotation 4 of the crankshaft 3 and the common plane 34 of the axes of rotation 32 and 33 of the two support rollers 21 and 22 has a distance s and is parallel, an acute angle 37 a.

That in the FIG. 4 shown deep rolling machine corresponds to the deep rolling machine, as in the FIGS. 1 and 2 is shown.

When cutting through a deep rolling head, as in the FIG. 5 is shown, one first recognizes the deep rolling force 39, which is exerted by the housing 40 via the rotatably mounted therein guide roller 41 and the fixed rollers 23 and 24 on the crankshaft 3. A corresponding parallelogram is in the FIG. 6 represented where the deep rolling force 39 in the two equal components 39 'and 39 "is divided.

If an axial disturbing force 42 is exerted on the housing 40 of the deep rolling roller head 13, a parallelogram of forces is obtained according to FIG FIG. 7 , There, the deep rolling force 39 is decomposed into the two components 39 '"and 39". "The two components 39"' and 39 "" obviously have different sizes. Retransferred to the cut of FIG. 5 this means that a larger force 39 '"is exerted on the crankshaft 3 by the left deep-rolling roller 24 than by the right deep-rolling roller 23 with the component 39"".

Accordingly, the result of the deep rolling is different.

In the FIG. 8 is another possible embodiment of a deep rolling machine shown. Instead of scissor arms as the embodiment of the Figure 1 to 4 are based, you have a deep rolling device 49 compact design present. Thereafter, the two arms 43 and 44 are connected to each other via a yoke 45. A lever 46 with two joints 47 and 48 and a corresponding drive (not shown) get the pivoting of the deep rolling device 49 in the working position. While the deep rolling roller head 13 is connected in a known manner to the arm 43, the support roller head 50 is brought by a drive 51 with respect to the crankshaft 3 in an open and closed position. From the yoke 45 jumps in the direction of the axis of rotation 4 of the crankshaft 3, an axial guide roller 52. The axial guide roller 52 is rotatably mounted in a socket 53 on the yoke 45. The storage of the axial guide roller 52 in the base 53 may be either rigid, as in the FIG. 8 is shown, but it may also have its own drive (not shown), which is similar to the drive 51, the axial guide roller 52 to transfer into a closed and open position is suitable.

Instead of individual axial guide roller 27 and 52, sliding bodies can be provided which, without being rotatable themselves, can be moved into the intermediate space 29a between the two oil straps 25 and 26.

Instead of individual axial guide rollers 27 and 52 pairs of axial guide rollers may be provided, whose diameter 28 is substantially smaller than in the FIG. 3 is shown, the outer circumferences, however, bridge the mutual distance 29a of the oil bundles 25 and 26. Again, that applies instead of two individual axial guide rollers 27 and 52 sliding bodies (not shown) are provided, as they themselves from the DE 202 00 926 U1 are known.

The advantage of arranging an axial guide roller 27, 52 on the deep rolling roller head 13 or on the yoke 45 of a deep rolling machine 8, 49 has the advantage over the known arrangement of an axial guide roller on the support roller head 14 that the axial guidance of the deep rolling device 8, 49 can take place directly with respect to the crankshaft 3 so that any lack of stiffness in the Gerätearm 9, 43, which carries the deep rolling roller head 13, as well as in the shear pivot point 11 between the two arms 9, 10 can not affect the Festwalzergebnis with.

Claims (5)

1. Deep rolling unit (8) of a deep rolling machine (1) for crankshafts (3),

   - with two arms (9, 10) opposite each other, one of which (9) carries a deep rolling head (13) and the other (10) carries a support roller head (14) whereby the support roller head (14) is equipped with two axis-parallel support rollers (21, 22) and the deep rolling head (13) is equipped with at least one work roller (23, 24) whose rotational axis lies at the same level as the rotational axis (4) of the crankshaft (3) creating an angle,

   - with a drive direction (15) that creates the closing and opening movement (35, 36) of the deep rolling unit (8) and generates the deep rolling force (39) and

   - with an axial guiding roller (27) with a diameter (28) that is slightly smaller than the distance (29a) between the oil flanges (25, 26) of a main pin (6) or crankpin (5) of the crankshaft (3), and at a distance (s) to the common level (34) of the rotational axes (32, 33) of the two support rollers (21, 22),

   characterised in that in the case of a scissor-type design of the deep rolling unit (8), the axial guiding roller (27) is located on the deep rolling head (13) and the rotational axis (7) of the axial guiding roller (27), which is parallel to a plane (38), creates a sharp angle (37) with a plane (38) that contains the rotational axis (4) of the crankshaft (4), and is parallel to the common plane (34) of the rotational axes (32, 33) of the two support rollers (21, 22).
2. Deep rolling unit of a deep rolling machine (1) for crankshafts (3) with two arms (9, 10) opposite each other, one of which (9) carries a deep rolling head (13) and the other (10) carries a support roller head (14) whereby the support roller head (14) is equipped with two axis-parallel support rollers (21, 22) and the deep rolling head (13) is equipped with at least one work roller (23, 24) whose rotational axis lies on the same plane as the rotational axis (4) of the crankshaft (3) creating an angle, with a drive direction (15) that creates the closing and opening movement (35, 36) of the deep rolling unit (8) and generates the deep rolling force (39), and is equipped with an axial guiding roller (27) with a diameter (28) that is slightly smaller than the distance (29a) between the oil flanges (25, 26) of a main pin (6) or crankpin (5) of the crankshaft (3) and is at a distance (s) to the common plane (34) of the rotational axes (32, 33) of the two support rollers (21, 22),
   characterised in that in the case of a compact design of the deep rolling unit (49), whereby both arms (43, 44) are connected together via a yoke (45), there is an axial guiding roller (52) on the yoke (45) that is located centrally to the deep rolling head (13) and whose rotational axis (7) lies vertical to the rotational axis (4) of the crankshaft (3).
3. Deep rolling unit according to claims 1 or 2,
   characterised in that the profile of the axial guiding roller (27, 52) is flat or convex.
4. Deep rolling unit according to claim 3,
   characterised in that there is a fixed prismatic guiding component instead of the axial guiding roller (27).
5. Deep rolling unit according to claim 4,
   characterised in that the axial guiding roller (27, 52) or the sliding body is formed as a pair of axial guiding rollers or as a pair of sliding bodies.

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