US20060064860A1 - Method for manufacturing a constructed camshaft - Google Patents

Method for manufacturing a constructed camshaft Download PDF

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Publication number
US20060064860A1
US20060064860A1 US11/232,338 US23233805A US2006064860A1 US 20060064860 A1 US20060064860 A1 US 20060064860A1 US 23233805 A US23233805 A US 23233805A US 2006064860 A1 US2006064860 A1 US 2006064860A1
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US
United States
Prior art keywords
tube
depressions
pressure
contour
longitudinal axis
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.)
Abandoned
Application number
US11/232,338
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English (en)
Inventor
Joerg Leihkauf
Jirka Heinrich
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.)
Linamar Antriebstechnik & Co KG GmbH
Original Assignee
Linamar Antriebstechnik & Co KG 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.)
Filing date
Publication date
Application filed by Linamar Antriebstechnik & Co KG GmbH filed Critical Linamar Antriebstechnik & Co KG GmbH
Assigned to LINAMAR ANTRIEBSTECHNIK GMBH & CO. KG reassignment LINAMAR ANTRIEBSTECHNIK GMBH & CO. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HEINRICH, JIRKA, LEIHKAUF, JOERG
Publication of US20060064860A1 publication Critical patent/US20060064860A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P11/00—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for 
    • B23P11/005—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for  by expanding or crimping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/84—Making other particular articles other parts for engines, e.g. connecting-rods
    • B21D53/845—Making camshafts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P2700/00—Indexing scheme relating to the articles being treated, e.g. manufactured, repaired, assembled, connected or other operations covered in the subgroups
    • B23P2700/02—Camshafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2303/00—Manufacturing of components used in valve arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/17—Crankshaft making apparatus

Definitions

  • the invention relates to a method for manufacturing a constructed camshaft starting from a tube into which a plurality of noncircumferential depressions, which are oriented parallel to the longitudinal axis and are transverse with respect to the longitudinal axis, are pressed, and separated prefabricated cams are attached to the tube.
  • Camshafts are used for controlling valves in internal combustion engines of motor vehicles. As technical progress has continued these internal combustion engines have been constructed with increasingly compact designs. The fabrication of engines, specifically the assembly, takes place in a highly automated fashion so that in this context use is increasingly being made of easy-to-assemble modules which are pre-assembled by the system suppliers. For reasons of space, the camshafts are often positioned in pairs so close to one another that direct access to the cylinder head bolts is no longer possible. As a result of these requirements, there is a need for specially shaped camshafts which allow, for example, automatic screwdriver devices to access the cylinder head bolts.
  • DE 20116112 UI specifies a solution with which access to the cylinder head bolts is made possible in the installed state of the camshaft via depressions formed in the tube.
  • the desired depressions are produced on the initial tube by pressing a plurality of shaping dies, which are arranged in holding tools, into the wall of the tube in a separate fabrication step before the cams are pushed on and attached.
  • the tool which is used for producing the depressions in the transverse direction with respect to the axis of the camshaft must be shaped in such a way that the deformation produced in the region of the wall of the tube during the pressing-in process does not result in the original external diameter of the tube being made larger in the adjacent region of the wall of the tube. This is absolutely necessary so as to permit the prefabricated cams, provided with a bore corresponding to the external diameter of the tube, to be pushed over the tube, provided with the depressions, to their position in the subsequent fabrication step.
  • the camshaft which is manufactured according to this method has the disadvantage that an additional, costly fabrication step for producing the depressions in the camshaft tube is necessary and that the external diameter of the tube must not be changed.
  • the object of the invention is therefore to specify a method for manufacturing constructed camshafts and a device for carrying out this method with which depressions can be produced on the camshaft in an easy and cost-effective way.
  • a method for manufacturing a constructed camshaft wherein a plurality of non-circumferential depressions, which are oriented parallel to the longitudinal axis and are transverse with respect to the longitudinal axis, are pressed into a tube, wherein separately prefabricated cams are attached to the tube, and wherein the pressing-in of the depressions and the attachment of the cams to the tube take place in one working step.
  • the cams are attached to the tube by hydroforming, with the pressing-in of the depressions taking place before the start of the increase in pressure or during the increase in pressure in the tube to a predefined final pressure.
  • a hydroforming tool composed of an upper tool and a lower tool with axially moveable sealing dies is used, in which hydroforming tool shaping dies, which can be moved radially with respect to the axis of the tube and as far as into the cavity formed by the closed tool, are arranged in the upper and/or lower tools.
  • a predefined supporting pressure is applied to the tube, in which case, after this supporting pressure has been reached, the depressions are pressed in completely and the internal pressure is then increased to the final pressure to be attained.
  • This procedure has the advantage that it requires substantially lower die forces than if the shaping dies have to be moved counter to the maximum final pressure.
  • the shaping dies are not already moved into their final position before the supporting pressure is applied so that the axial widening of the resulting deformation is reduced. Furthermore, when the depressions are pressed in without a supporting pressure in the tube, undesired deformations or buckling points may be formed, these can even be equalized by the maximum final pressure.
  • the maximum supporting pressures in the case of the shaping die which is drawn back in the tool should advantageously be selected such that the tube is prevented from widening into the die guide, as a result of which otherwise notches, which constitute weak points in the camshaft, may be formed.
  • the tube When the depressions are pressed in, in addition to the axial movement of the sealing dies which is necessary to maintain the seal, it is advantageously possible for the tube to be pushed axially beyond this.
  • the change in the wall thickness caused by the material flow in the region of the depression can thus be utilized to even out the thickness of the wall in particular at the depressions which are respectively closest to the end of the tube.
  • the final pressure is preferably selected such that the tube comes to bear against the dimension-forming bottom die and upper die contours of the hydroforming tool.
  • the supporting pressure and the final pressure to be reached are advantageously configured as a function of the tube material, the thickness of the wall of the tube and the diameter of the tube.
  • a supporting pressure in the range from 200 to 1000 bar and a final pressure of 2000 to 4000 bar have proven favorable.
  • This widening can advantageously be varied here in such a way that the functional elements or additional elements which are pushed onto the tube and formed concurrently therewith, can be protected against axial displacement on the tube by widening the tube directly next to the elements.
  • a further advantage according to the invention is the possibility of the freely selectable depth of the depressions.
  • the depressions should advantageously be introduced as far as the center axis of the camshaft owing to the necessary bending strength.
  • the shaping die of the device according to the invention is configured in such a way that, when the shaping die moves into the tube, a desired symmetrically concave depression is produced, preferably transversely with respect to the axis of the component.
  • the contour of the shaping die, which contour makes contact with the wall of the tube has a correspondingly symmetrically convex curvature which is advantageously of semicircular design.
  • the shaping dies which are arranged along the axis of the tube in the tool preferably have different contours. It has proven advantageous that the shaping dies located in the region of the ends of the tubes are of asymmetrically convex design. For this purpose, that side of the shaping die which faces the end of the tube has a further section of concave design starting from the convex contour. This section of concave design can optionally also be provided on both sides.
  • the section which is of concave design ensures that there is a rounded junction between the depression and the external diameter of the tube as the tube is subsequently pushed axially. This avoids sharp-edged junctions which may adversely affect the fatigue strength of the camshaft.
  • the shaping region of the shaping die may be modified as desired in order to produce other configurations which differ from a cylindrically concave depression.
  • This bead ensures that the junction, which has extremely sharp edges in cross section, between the depression and the adjoining wall of the tube can be manufactured with a significantly enlarged radius. Reducing the notch effect in this region allows the fatigue strength to be significantly improved.
  • the shaping die has contouring of the surface of complementary design in order to produce such a bead.
  • FIG. 1 is a basic drawing of a cross section through an opened hydroforming tool with retracted shaping dies and an inserted tube and pushed-on cam rings;
  • FIG. 2 is a basic drawing of a cross section through a closed hydroforming tool with a tube which is fixed in position by shaping dies before the internal pressure is applied;
  • FIG. 3 is a basic drawing of a cross section through a closed hydroforming tool at the end of the hydroforming process with shaping dies in the final position;
  • FIGS. 4 a, b are basic illustrations of shaping dies according to the invention.
  • FIG. 5 shows a cross section through a camshaft in the region of a depression with a bead.
  • FIG. 1 shows a tube 1 made of easily deformable material which is inserted into the opened hydroforming tool 3 which is composed of an upper tool 3 a and a lower tool 3 b.
  • the shaping dies 2 are retracted to such an extent that the tube 1 can be inserted into the bottom die of the hydroforming tool 3 without coming into contact with the shaping dies 2 .
  • Functional elements 5 in the form of cam rings, which are connected to the tube 1 in a positionally secure fashion by means of the hydroforming process are pushed onto the tube 1 .
  • the sealing dies 4 which are necessary for sealing the ends of the tube are already located in position between the upper tool 3 a and the lower tool 3 b but are also at an axial distance from the respective end of the tube.
  • the sealing dies 4 come to bear against the ends 30 of the tube in a fluidtight fashion and an internal pressure of the tube is then increased to a predefined supporting pressure ( FIG. 2 ).
  • the shaping dies 2 are moved into their final position in accordance with FIG. 3 and the depressions 6 are produced on the tube 1 .
  • the internal pressure of the tube is then increased to the final pressure to be attained, with the cam rings 5 being simultaneously attached to the tube 1 in a frictionally and positively locking fashion.
  • the wall of the tube lying radially opposite the depression 6 and the axially adjoining regions of the tube are widened beyond the original external diameter of the tube.
  • FIGS. 4 a and b are examples of shaping dies according to the invention.
  • FIG. 4 a shows a shaping die 2 which is provided with a convex contour. Starting from a semicircular contour of the shaping die 2 , the contour has, on one side, a further concave section 10 starting from the convex contour.
  • FIG. 4 b shows, by way of example, a shaping die 2 with a bulge S which is arranged at the apex of the contour and which produces an additional bead in the longitudinal direction of the tube when the depression is pressed in.
  • FIG. 5 shows a cross section through a camshaft 1 in the region of a depression 6 with an additionally impressed bead 11 .
  • the region of the junction between the depression and the semicircular wall of the tube is marked in cross section. Impressing the bead 11 ensures that the junction, which is otherwise extremely sharp-edged on the internal and external circumferences, can be manufactured with a clearly formed radius.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
US11/232,338 2003-03-21 2005-09-21 Method for manufacturing a constructed camshaft Abandoned US20060064860A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10313812.9 2003-03-21
DE10313812A DE10313812B3 (de) 2003-03-21 2003-03-21 Verfahren und Vorrichtung zur Herstellung einer gebauten Nockenwelle
PCT/EP2004/002236 WO2004082863A1 (de) 2003-03-21 2004-03-05 Verfahren zur herstellung einer gebauten nockenwelle

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2004/002236 Continuation WO2004082863A1 (de) 2003-03-21 2004-03-05 Verfahren zur herstellung einer gebauten nockenwelle

Publications (1)

Publication Number Publication Date
US20060064860A1 true US20060064860A1 (en) 2006-03-30

Family

ID=32921138

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/232,338 Abandoned US20060064860A1 (en) 2003-03-21 2005-09-21 Method for manufacturing a constructed camshaft

Country Status (4)

Country Link
US (1) US20060064860A1 (de)
EP (1) EP1608473A1 (de)
DE (1) DE10313812B3 (de)
WO (1) WO2004082863A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010051997A1 (de) 2010-11-19 2012-05-24 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren und Vorrichtung zur Herstellung eines hohlen Bauteils und ein hohles Bauteil
CN103551850B (zh) * 2013-11-14 2016-08-17 重庆应国机械制造有限责任公司 单拐全纤维曲轴锻件的闭式挤压锻造工艺
CN112318069B (zh) * 2020-10-13 2022-08-26 常熟纺织机械厂有限公司 凸轮开口装置的共轭凸轮及其加工方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6035821A (en) * 1997-07-03 2000-03-14 Yamaha Hatsudoki Kabushiki Kaisha Cam shaft for engine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3704092C1 (de) * 1987-02-10 1988-05-26 Schneider Gesenkschmiede Hohlwelle sowie Verfahren zu ihrer Herstellung
DE19907258C1 (de) * 1999-02-21 2000-09-07 Saechsische Elektronenstrahl G Verfahren zur Herstellung von Nockenwellen und danach hergestellte Nockenwelle
DE20116112U1 (de) * 2001-10-01 2001-12-13 Thyssen Krupp Automotive Ag Nockenwelle mit Einbuchtungen
US6935292B2 (en) * 2001-11-27 2005-08-30 Thyssenkrupp Presta Ag Camshaft with curvature

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6035821A (en) * 1997-07-03 2000-03-14 Yamaha Hatsudoki Kabushiki Kaisha Cam shaft for engine

Also Published As

Publication number Publication date
EP1608473A1 (de) 2005-12-28
DE10313812B3 (de) 2004-09-30
WO2004082863A1 (de) 2004-09-30

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Legal Events

Date Code Title Description
AS Assignment

Owner name: LINAMAR ANTRIEBSTECHNIK GMBH & CO. KG, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LEIHKAUF, JOERG;HEINRICH, JIRKA;REEL/FRAME:016884/0835;SIGNING DATES FROM 20051117 TO 20051121

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION