EP0253907B1 - Méthode de formage pour tourillons ayant des orifices transversals - Google Patents

Méthode de formage pour tourillons ayant des orifices transversals Download PDF

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Publication number
EP0253907B1
EP0253907B1 EP86109930A EP86109930A EP0253907B1 EP 0253907 B1 EP0253907 B1 EP 0253907B1 EP 86109930 A EP86109930 A EP 86109930A EP 86109930 A EP86109930 A EP 86109930A EP 0253907 B1 EP0253907 B1 EP 0253907B1
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EP
European Patent Office
Prior art keywords
rolling
rolling force
bore
force
cross
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP86109930A
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German (de)
English (en)
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EP0253907A1 (fr
Inventor
Garri Dr.-Ing. Bernstein
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hegenscheidt MFD GmbH and Co KG
Original Assignee
Wilhelm Hegenscheidt GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8195279&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0253907(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Wilhelm Hegenscheidt GmbH filed Critical Wilhelm Hegenscheidt GmbH
Priority to EP86109930A priority Critical patent/EP0253907B1/fr
Priority to DE3689955T priority patent/DE3689955D1/de
Priority to JP61198273A priority patent/JPS6330137A/ja
Priority to US07/049,659 priority patent/US4782680A/en
Publication of EP0253907A1 publication Critical patent/EP0253907A1/fr
Application granted granted Critical
Publication of EP0253907B1 publication Critical patent/EP0253907B1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B39/00—Burnishing machines or devices, i.e. requiring pressure members for compacting the surface zone; Accessories therefor
    • B24B39/04—Burnishing machines or devices, i.e. requiring pressure members for compacting the surface zone; Accessories therefor designed for working external surfaces of revolution

Definitions

  • the invention relates to a method for rolling at least one pin having cross holes in the puncture method with at least one roller and at least one support roller, the diameter of a cross hole being smaller than the length of the pin and each roller under a specific rolling force generated and desired by a selected rolling force Rolling force acts on the pin surface during the rotation.
  • Pins with cross bores can be, for example, bearing pins of crankshafts.
  • devices and methods have already become known, for example with DE-PS 2146994.
  • closed, i.e. uninterrupted pin surfaces are concerned, these devices and the procedure carried out with such devices have proven their worth.
  • the tools belonging to such facilities usually work in the so-called. Puncture procedure. If cross-bores are rolled over with such devices and the associated tools, undesirable and generally impermissible shape deviations occur.
  • the object of the invention is therefore the basis is to propose a method of the type described at the outset with which it is possible to roll over transverse bores without inadmissible shape tolerances on the workpiece.
  • this object is achieved according to the invention in that the rolling force of a rolling roller rolling over the bore is reduced at least while a transverse bore is being rolled over, the rolling force which acts on the pin during the rolling over of a transverse bore at the latest in the region of a longitudinal surface line , which runs across the center of the hole, reached a minimum.
  • the rolling of such pins in the puncture process takes place with a positive fit, so that a certain force effect of the rolling rollers on the workpiece is actually achieved.
  • a rolling force control is carried out in accordance with the invention in such a way that a smaller rolling force is present in the region of the bore, that is to say when the respective rolling roller rolls over the bore region.
  • This is also harmless, since it is not primarily the rolling force that is important, but rather the specific rolling force.
  • the rolling roller enters the bore area, the area with which the rolling roller rests on the workpiece initially becomes smaller, as a result of which the surface pressure and thus the deformation of the workpiece become greater with a constant rolling force.
  • the endeavor must now be to limit the changes in the specific rolling force during the rolling over of the bore cross section in such a way that undesired shape deviations no longer occur.
  • DE-PS 3037688 has already made known a rolling machine for crankshaft journal, in which a rolling force control is carried out during the rotation of the respective crankshaft journal. With this rolling force control, however, the deflection of the crankshaft mirrors is influenced. Any reference to a connection between the rolling force control carried out according to this patent specification and the rolling over of cross bores on such bearing journals cannot be gathered from this document.
  • the rolling force is reduced only until the specific rolling force corresponds to the specific rolling force that is required to achieve the required surface roughness.
  • the minimum rolling force is applied in the entire bore area of the pin.
  • the necessary control of the rolling force can be simplified very much and a satisfactory result can nevertheless be achieved, in particular if small diameter cross holes are involved.
  • An inadmissible shape deviation can be avoided despite the simplification of cross-bores of sufficiently small diameter.
  • a simple experiment is sufficient to determine whether the diameter of a cross hole is small enough to carry out the simplified method. Such an attempt is also possible and reasonable since such workpieces to be rolled are mass-produced items.
  • the rolling force is reduced to such an extent that it generates the specific rolling force on the pin surface, at least in the area of the largest bore cross section, that of the specific rolling force which is responsible for the remaining area of the pin surface is applied corresponds.
  • the power control can be reduced to a simple power switch, which is particularly easy, for example, by means of hydraulics.
  • At least the beginning of the reduction in the rolling force lies within a circumferential length of 0 to 3 mm before the start of the bore.
  • the maximum rolling force is reached again at the latest 3 mm in the circumferential direction behind the bore. This also prevents undesirable irregularities in shape due to a too rapid increase in the rolling force. At the same time, it is ensured that when the rolling roller has left the area of influence of the transverse bore, the rolling force required for the remaining area is reached again with the specific rolling force assigned to this rolling force.
  • the rolling force is only changed in such a size and at such a speed that, on the one hand, the required shape tolerances in the area of the changing rolling force and, on the other hand, the required surface characteristic values are maintained.
  • the limits within which such changes can be made can be determined by simple experiments.
  • the required shape tolerances and surface characteristics are guidelines that must be observed. Since a rolling force change is required for the rolling over of cross bores and this rolling force change only with a finite speed can the assigned machine elements also be of such a capacity that the change in force and their size and speed can be carried out in such a way that the necessary shape tolerances and surface characteristics are achieved.
  • the pulsating rolling force is always not equal to zero, the pulsating rolling force is superimposed on a static basic rolling force with a pulsating rolling force of the specified frequency and amplitude, which causes a significant increase in the depth of consolidation and microhardness compared to a static deep rolling force of the maximum value of the amplitude.
  • the workpiece deformation, which is caused by the pulsating tool, is, insofar as it is caused by the pulsation, essentially in the elastic range. This does not result in measurable surface ripples. Rather, the surface qualities achievable with known smooth rolling processes can be achieved.
  • the minimum value of the pulsating rolling force corresponds to the value to achieve a desired smooth rolling result and the maximum value of the pulsating rolling force corresponds to the value to achieve a desired hardening depth and / or the value of the desired microhardness increase.
  • limit data are specified which enable a desired rolling result to be achieved.
  • the course of the rolling force F over the angle of rotation phi is plotted in a Cartesian coordinate system as functioncon F (phi).
  • a rotational angle range phi of 360 ° is plotted in FIGS. 1 a to d.
  • the force curve specified there therefore corresponds to the force curve over a workpiece revolution.
  • an area B is also marked, in which a transverse bore is to be located.
  • the rolling force F is essentially constant during a workpiece rotation of 360 °.
  • the rolling force F is reduced only in region B, which corresponds to the cross-sectional area of the transverse bore. The reduction is carried out according to a sine function down to a minimum value Fmin.
  • the minimum value is at least approximately in the area of the largest diameter of the bore. It can, for example, be dimensioned such that a specific rolling force is set to the side next to the bore, which corresponds to the specific rolling force that occurs on the journal outside the bore region B or deviates from it only to such an extent that no inadmissible shape deviations occur on the workpiece.
  • the reduction in strength According to a sine function, this ensures that, depending on the position of the roller over the bore cross-section, the specific rolling force in the instantly rolled area at the side next to the bore remains at least approximately constant over the entire bore area.
  • FIG. 1 a an approximation to the function of the force F (phi) according to FIG. 1 a may already be sufficient to achieve the desired purpose.
  • FIG. 1 b Such an approximation is shown in Figure 1 b.
  • the force curve of the force F (phi) in the area B of the bore is shown as a linear decrease down to a minimum value Fmin and a linear increase.
  • Fmin is in the area of the largest diameter of the cross hole.
  • Such a course of the force F over the angle of rotation phi may well be sufficient to achieve the desired smooth rolling result without producing inadmissible shape tolerances on the workpiece.
  • Figure 2 shows essentially a Cartesian coordinate system like Figures 1a-d. However, the area B of the transverse bore is shown enlarged in FIG. At the same time, a force F '(phi) is shown in Figure 2, which can be in its course as the force F (phi) according to Figures 1a-d.
  • the force curve according to FIG. 1 d is selected as an example in FIG. In area B and this area adjacent as inlet and outlet, the force F '(phi) is superimposed by a pulsating rolling force Fp of amplitude A. This amplitude can be 10-100% of the local minimum value F' (phi).
  • peak values F'p may well be higher than the maximum rolling force F '(phi) in the static range.
  • the method according to the invention can be carried out with the devices described in the prior art.
  • the control devices which control the force profile of the rolling force during one revolution of the workpiece are adjusted with regard to their impulses so that they carry out a force control according to the position of the transverse bore to the rolling rollers of the rolling tools. It is advantageous to ensure that the rolling process is not started in an angular position of the workpiece in which the rolling roller lies on the transverse bore. If this condition is avoided for the start of the rolling process, this improves the dimensional accuracy of the workpiece and simplifies the control for the rolling force.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Control Of Metal Rolling (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Manufacture Of Motors, Generators (AREA)

Claims (9)

  1. Procédé de laminage, pour tourillons présentant au moins un alésage transversal (B), suivant le procédé par passes, avec au moins un galet de laminage et au moins un galet d'appui, le diamètre d'un alésage transversal (B) étant plus petit que la longueur du tourillon, et chaque galet de laminage agissant sur la surface externe du tourillon, pendant la rotation, sous une force de laminage spécifique souhaitée et réalisée par une force de laminage (F(φ)) choisie, caractérisé en ce qu'au moins pendant le laminage au-dessus d'un alésage transversal (B), la force de laminage (F(φ)) d'un galet de laminage laminant au-dessus de l'alésage transversal (B) est diminuée, étant entendu que la force de laminage (F(φ)), qui agit sur le tourillon pendant le laminage au-dessus d'un alésage (B), atteint le minimum (F min), au plus tard dans la zone d'une ligne longitudinale de la surface externe passant par le centre de l'alésage (B).
  2. Procédé suivant la revendication 1, caractérisé en ce que l'on abaisse la force de laminage (F) seulement jusqu'à ce que la force spécifique de laminage corresponde à la force spécifique de laminage qui est nécessaire pour atteindre la rugosité réclamée pour la surface externe.
  3. Procédé suivant au moins l'une des revendications 1 et 2, caractérisé en ce que la force de laminage minimale (F min) est appliquée dans toute la zone de l'alésage transversal du tourillon.
  4. Procédé suivant au moins l'une des revendications 1 à 3, caractérisé en ce qu'au plus tard quand un galet de laminage atteind la zone d'un alésage transversal (B), la force de laminage (F) est suffisamment abaissée pour qu'au moins dans la zone d'une ligne longitudinale de la surface externe, passant par le centre de l'alésage (B), elle produise, sur la surface externe du tourillon, la force spécifique de laminage, qui correspond à la force spécifique de laminage qui est appliquée sur le reste de la zone de surface externe du tourillon.
  5. Procédé suivant au moins l'une des revendications 1 à 4, caractérisé en ce qu'au moins le début d'abaissement de la force de laminage est situé à l'intérieur d'une longueur, suivant la périphérie, de 0 à 3 mm avant le début de l'alésage.
  6. Procédé suivant au moins l'une des revendications 1 à 5, caractérisé en ce que la force de laminage maximale est atteinte, dans le sens périphérique, au plus tard 3 mm après l'alésage.
  7. Procédé suivant au moins l'une des revendications 1 à 6, caractérisé en ce qu'une modification de la force de laminage est seulement appliquée avec une grandeur telle et une vitesse telle que, d'une part, dans la zone de la force de laminage en cours de modification, les tolérances de forme exigées sont maintenues, et que, d'autre part, les caractéristiques exigées pour la surface sont maintenues.
  8. Procédé suivant au moins l'une des revendications 1 à 7, caractérisé en ce qu'à tout instant de l'opération de laminage où on le désire, au plus un galet de laminage se trouve dans la zone d'un alésage transversal (B).
  9. Procédé suivant au moins l'une des revendications 1 à 8, caractérisé en ce que, dans la direction périphérique, au moins dans toute la zone de l'alésage transversal (B) du tourillon, on procède au laminage avec une force de laminage pulsée, différente de zéro, tandis que, dans la zone restante, on procède au laminage avec une force de laminage non pulsée F(p), étant entendu que la force de laminage est pulsée avec une fréquence de 30 à 300 Hz et une amplitude (A) de 10 à 100 % de sa valeur minimale locale, étant entendu que la vitesse de laminage est déterminée de telle façon que les points les plus profonds de la pénétration des galets de laminage provenant de la force maximale de laminage, dans la mesure où elle correspondrait à une charge statique, se suivent les uns les autres à une distance qui n'est pas plus grande que le double de la largeur de pénétration elle-même.
EP86109930A 1986-07-19 1986-07-19 Méthode de formage pour tourillons ayant des orifices transversals Expired - Lifetime EP0253907B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP86109930A EP0253907B1 (fr) 1986-07-19 1986-07-19 Méthode de formage pour tourillons ayant des orifices transversals
DE3689955T DE3689955D1 (de) 1986-07-19 1986-07-19 Verfahren zum Walzen von Querbohrungen aufweisende Zapfen.
JP61198273A JPS6330137A (ja) 1986-07-19 1986-08-26 横孔を有する軸の圧延方法
US07/049,659 US4782680A (en) 1986-07-19 1987-05-13 Method for rolling a shaft or tenon having cross-bored holes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP86109930A EP0253907B1 (fr) 1986-07-19 1986-07-19 Méthode de formage pour tourillons ayant des orifices transversals

Publications (2)

Publication Number Publication Date
EP0253907A1 EP0253907A1 (fr) 1988-01-27
EP0253907B1 true EP0253907B1 (fr) 1994-07-06

Family

ID=8195279

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86109930A Expired - Lifetime EP0253907B1 (fr) 1986-07-19 1986-07-19 Méthode de formage pour tourillons ayant des orifices transversals

Country Status (4)

Country Link
US (1) US4782680A (fr)
EP (1) EP0253907B1 (fr)
JP (1) JPS6330137A (fr)
DE (1) DE3689955D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018126185A1 (de) 2018-10-22 2020-04-23 Schaeffler Technologies AG & Co. KG Werkzeug und Verfahren zur mechanischen Oberflächenbearbeitung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02225530A (ja) * 1989-02-27 1990-09-07 Yazaki Corp シリコーンゴムの架橋方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE23878E (en) * 1952-07-02 1954-09-28 Elastic locking ehsert secured
DE2146994C3 (de) * 1971-09-21 1974-03-14 Wilhelm Hegenscheidt Gmbh, 5140 Erkelenz Einrichtung zum Glattwalzen von Kurbelwellenlagersitzen
SU521122A1 (ru) * 1974-07-18 1976-09-05 Предприятие П/Я Р-6543 Устройство дл чистовой и упрочн ющей обработки
US4299017A (en) * 1979-05-11 1981-11-10 W. Hegenscheidt Gesellschaft Mbh Apparatus for smooth rolling the bearing seats of crankshafts
DE2920889C2 (de) * 1979-05-23 1983-06-01 Wilhelm Hegenscheidt, Gmbh, 5140 Erkelenz Verfahren zum Kaltwalzen von Bauteilen
DE3037688C2 (de) * 1980-10-06 1982-12-02 Wilhelm Hegenscheidt, Gmbh, 5140 Erkelenz Verfahren zum Festwalzen von Kurbelwellen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018126185A1 (de) 2018-10-22 2020-04-23 Schaeffler Technologies AG & Co. KG Werkzeug und Verfahren zur mechanischen Oberflächenbearbeitung

Also Published As

Publication number Publication date
JPS6330137A (ja) 1988-02-08
EP0253907A1 (fr) 1988-01-27
US4782680A (en) 1988-11-08
DE3689955D1 (de) 1994-08-11

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