EP3670018A1 - Procédé et installation de formage permettant de fabriquer une partie d'engrenage en forme de tambour - Google Patents

Procédé et installation de formage permettant de fabriquer une partie d'engrenage en forme de tambour Download PDF

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Publication number
EP3670018A1
EP3670018A1 EP18214820.5A EP18214820A EP3670018A1 EP 3670018 A1 EP3670018 A1 EP 3670018A1 EP 18214820 A EP18214820 A EP 18214820A EP 3670018 A1 EP3670018 A1 EP 3670018A1
Authority
EP
European Patent Office
Prior art keywords
workpiece
forming
toothing
roller
station
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.)
Withdrawn
Application number
EP18214820.5A
Other languages
German (de)
English (en)
Inventor
Benedikt Nillies
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.)
Leifeld Metal Spinning GmbH
Original Assignee
Leifeld Metal Spinning 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 Leifeld Metal Spinning GmbH filed Critical Leifeld Metal Spinning GmbH
Priority to EP18214820.5A priority Critical patent/EP3670018A1/fr
Priority to JP2019227370A priority patent/JP7274402B2/ja
Priority to US16/721,537 priority patent/US11504762B2/en
Priority to CN201911328870.0A priority patent/CN111347003A/zh
Publication of EP3670018A1 publication Critical patent/EP3670018A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21HMAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H5/00Making gear wheels, racks, spline shafts or worms
    • B21H5/02Making gear wheels, racks, spline shafts or worms with cylindrical outline, e.g. by means of die rolls
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21HMAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H5/00Making gear wheels, racks, spline shafts or worms
    • B21H5/02Making gear wheels, racks, spline shafts or worms with cylindrical outline, e.g. by means of die rolls
    • B21H5/025Internally geared wheels
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21KMAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00Making machine elements
    • B21K1/28Making machine elements wheels; discs
    • B21K1/30Making machine elements wheels; discs with gear-teeth
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/14Spinning
    • B21D22/16Spinning over shaping mandrels or formers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00Making other particular articles
    • B21D53/26Making other particular articles wheels or the like
    • B21D53/28Making other particular articles wheels or the like gear wheels

Definitions

  • the invention relates to a method for producing a drum-shaped gear part by rotary forming, according to the preamble of claim 1.
  • the invention further relates to a forming system according to claim 9, which is designed in particular to carry out a method for producing a drum-shaped gear part.
  • drum-shaped gear parts in particular clutch plate carriers
  • axial rolling is essentially provided on a press for large numbers of pieces.
  • incremental forming processes are used, depending on the torques to be transmitted or the component requirements, in particular spinning, profiling or axial rolling in partial steps.
  • the requirements for NOx reduction and CO 2 saving in vehicle construction require an increasing weight reduction in the transmissions and the transmission components, including the clutch disc carriers.
  • the material requirements also change to higher-strength materials.
  • the so-called folding toothing has long been known for the production of clutch plate carriers.
  • a usually cup-shaped deep-drawn part is placed on a profiling machine between a tool mandrel and a pressure disc and set in rotation.
  • the tool mandrel has the negative shape of the component toothing to be produced.
  • a toothing roller with a corresponding toothing profile is then fed to the workpiece, so that the toothing profile on the inside and the outside is formed into the tool between the tool mandrel and the toothing roller, so that a fold-like toothing is created.
  • the invention has for its object to provide a method and a forming system with which gear parts can be efficiently manufactured with a particularly flexible and requirement-oriented component design.
  • the method according to the invention is characterized in that, in a preforming step, a rotationally symmetrical workpiece is set in rotation about its central axis and an ironing-pressing roll is carried out by at least axially advancing and overrunning at least one shaping roller, a cylindrical peripheral wall having a defined target wall thickness which is less than is an initial wall thickness of the workpiece, and that, in a final shaping step, the preformed workpiece is then clamped on an internal mandrel with external toothing and set in rotation, and at least one profiled toothing roller is fed radially, by means of which the cylindrical peripheral wall is essentially retained in the external toothing of the internal mandrel while maintaining the target wall thickness is molded, forming a drum-shaped toothing area with a folding toothing.
  • a basic idea of the invention is to use a sheet metal workpiece as the starting part, which has a uniform starting wall thickness.
  • a wall thickness reduction is integrated in one for a first weight optimization cylindrical peripheral wall section performed, wherein a defined target wall thickness is set by spinning.
  • the workpiece is axially lengthened in a desired manner.
  • the initial wall thickness of the workpiece can be retained in a partial area of the workpiece, in particular in a radially extending hub area.
  • the workpiece can be reclamped and a folding toothing can be formed in the cylindrical peripheral wall area provided with a defined target wall thickness.
  • a folding toothing can be formed in the cylindrical peripheral wall area provided with a defined target wall thickness.
  • the workpiece is clamped on a correspondingly profiled inner mandrel and at least one toothing roller with a corresponding toothing profile is radially fed in from the outside, the peripheral wall being deformed like a fold.
  • Folded toothing is to be understood here as a toothing in which the toothing is formed both on the inside and on the outside, the target wall thickness previously set remaining almost constant in the course of the fold-like deformation of the cylindrical outer peripheral wall.
  • toothing is to be understood broadly and is in particular not limited to a meshing gear toothing. Rather, in the sense of the invention, the term toothing also includes other tooth-like shapes, such as groove or keyway profiles, which can be provided as radial stop elements for torque transmission in clutch disk carriers, for example.
  • a flat sheet metal part or a deep-drawn part, a forged or a cast part can be used as the starting workpiece.
  • a round blank or a cup-shaped preform is used as the starting workpiece, in which a hub region is preformed.
  • the hub area runs essentially transversely or radially to the cylindrical peripheral wall.
  • the hub area can be provided with recesses and / or indentations and also with a sleeve-shaped hub.
  • the preforming step and / or the final shaping step is carried out in several partial steps in the same workpiece clamping.
  • the preforming step initially consist of an approximately right-angled folding of an outer area of a flat sheet round blank and a subsequent pressure roller or ironing pressure roller, in which the initial wall thickness of the sheet metal part is reduced to the desired target wall thickness.
  • Such a reshaping in several sub-steps or stages can prevent overstressing of the workpiece material and thus the occurrence of cracks in the material.
  • the workpiece when the folding toothing is formed, the workpiece is held axially and / or radially at its edge region at the open end, which lies opposite a radially extending hub region. Holding at the open edge of the workpiece prevents undesired widening of the workpiece diameter at the edge area. Overall, this also increases the quality of the folding teeth.
  • axial holding is flexible, in particular pressure-dependent, with length or volume tolerances of the workpiece being compensated for.
  • a rigid hold is therefore not provided, but a hold which can be released or at least partially released when a predetermined limit pressure or a limit force is exceeded.
  • the holding device can be provided with a corresponding spring device or hydraulic damping elements. In this way, dimensional or material tolerances on the workpiece can be compensated to a certain extent, so that excess material is formed at the edge area, while the folding teeth can be formed with a high degree of accuracy.
  • the open end can also be held rigidly if the tolerances in the starting material are small.
  • the at least one toothing roller is delivered to the workpiece in a single radial infeed.
  • the gear roller can be axial Have length which corresponds to the axial length of the folding toothing to be introduced.
  • a preferred variant of the method can consist in that the at least one toothed roller is moved axially during the radial infeed or the forming, or is added radially in at least two steps, which are carried out with positions axially offset from one another. In this way, a relatively long folding toothing can also be produced with a shorter toothing roller. An increased flexibility in the forming can be achieved in this way.
  • a stiffening area with a preferably greater wall thickness is formed on the edge region of the workpiece.
  • the stiffening area with the large wall thickness can already be set during the preforming step with the press roll or the ironing press roll in that the forming roll stops before the end of the edge area.
  • the material reinforcement can be the initial wall thickness of the workpiece.
  • an additional thickening of the material at the edge region can also be produced by the material displaced during the ironing-pressing process.
  • a forming system which is designed in particular to carry out one of the methods described above, comprises at least a first forming station which has a main spindle which can be driven in rotation, at least one relatively axially adjustable forming roller and a first clamping element which is designed to clamp a workpiece on the main spindle , at least one second forming station, which has a rotationally drivable inner mandrel with an external toothing, at least one radially adjustable toothing roller and a second clamping element, which is designed to clamp the workpiece on the inner mandrel, and a handling station, which is located between the first forming station and the second forming station arranged and designed for transferring the workpiece after preforming in the first forming station to the second forming station for final forming.
  • the first and second forming station can be identical in that the workpiece is manufactured in two setups at one station.
  • the advantages described above with the method can be achieved with the forming system according to the invention.
  • the forming stations can be arranged on a common machine bed.
  • the handling station is preferably a multi-axis robot which transfers the workpieces between the forming stations and feeds or removes them.
  • a preferred embodiment of the forming system according to the invention consists in that the first forming station is designed for pressing and pressure rolling and that the second forming station is designed for profiling.
  • the forming stations can have horizontal or preferably vertical axes of rotation.
  • the main spindle of the first forming station and the inner mandrel of the second forming station are directed parallel and vertically. In this way, an overall compact forming system with a small footprint can be created.
  • a first tailstock spindle is assigned to the clamping of the workpiece on the first forming station of the main spindle and a second tailstock spindle in the second forming station to the inner mandrel, the first tailstock spindle and the second tailstock spindle being axial are movably mounted.
  • the tailstock spindles are arranged coaxially to the axis of rotation of the main spindle or the inner mandrel.
  • An axial movement is achieved in particular by corresponding lifting cylinders, which are preferably operated hydraulically.
  • the main spindle, the inner mandrel, the first tailstock spindle and / or the second tailstock spindle are mounted by means of a quick-change device.
  • the respective component can be quickly replaced by means of the quick-change device. This is particularly economical in terms of maintenance and especially when changing products.
  • the handling station is designed to feed the workpiece to be added and to remove the finished workpiece.
  • the handling station thus not only serves as a pure transfer station between the individual forming stations, but rather serves as a whole for feeding and / or removing the workpieces into or out of the system.
  • the handling station can in particular have at least one multi-axis robot with a corresponding gripping device for gripping the workpiece.
  • a particularly good shaping is achieved according to an embodiment variant of the forming system according to the invention in that the at least one toothed roller is driven in synchronism with the inner mandrel via a synchronization gear or a rotationally synchronously controlled drive.
  • This ensures that the toothing of the toothing roller is always arranged on the inner mandrel in a corresponding and synchronous manner to the outer toothing.
  • the gear roller and the inner mandrel can be driven by a common drive with a corresponding synchronization gear.
  • the at least one toothing roller and the inner mandrel can each have their own drive, the drives being driven by an electronic control in synchronism with the angle of rotation.
  • a circular or plate-shaped starting workpiece 5, also called workpiece 5, is shown.
  • This has a radially running hub area 6 with a central recess.
  • a thickened peripheral region 7 is arranged in a stepped manner towards the hub region 6.
  • the workpiece 5 can be produced by deep drawing, forging, casting or in another suitable manner.
  • a preforming step (not shown), the workpiece 5 is clamped on a rotatably drivable main spindle and axially turned by at least one axially adjustable shaping roller, whereby at the same time an initial wall thickness of the workpiece 5 to a defined target wall thickness of the desired cylindrical peripheral wall 14 is achieved by a basically known ironing roll is formed.
  • a folding toothing 20 is molded into a toothing region 16 essentially while maintaining the target wall thickness of the cylindrical peripheral wall 14. At an open end, which lies axially opposite the hub region 6 which is not further deformed, the folding toothing 20 is delimited by an annular edge region 18.
  • the folding teeth 20 formed on the gear part 10 according to the invention is shown in FIG Fig. 4 shown.
  • the workpiece 5 is clamped with the cylindrical peripheral wall 14 on an inner mandrel with a corresponding outer toothing and set in rotation.
  • at least one profiled toothing roller is radially advanced, through which the cylindrical peripheral wall 14 is molded or folded into the outer toothing of the inner mandrel essentially while maintaining the target wall thickness. This results in recessed areas 22 and projecting areas 24 which are connected to one another via obliquely directed flanks 26 in the exemplary embodiment shown.
  • the protruding areas 24 can have a wall thickness t1, the flanks 26 a wall thickness t2 and the recessed areas 22 have a wall thickness t3, which differ slightly, in particular by a few tenths of a millimeter, but essentially maintain the target wall thickness previously set in the sense of the invention is.
  • a weight-optimized gear part 10 can be produced, in which, compared to a hub region 6 with an essentially unchanged wall thickness on a cylindrical peripheral wall 14, a reduced wall thickness is set without cutting, into which the desired folding toothing 20 is then introduced.
  • a forming system 50 according to the invention is shown schematically in FIGS Figures 5 and 6 shown.
  • a first forming station 60 and a second forming station 70 are arranged on a preferably multi-part machine bed 52. Between the first forming station 60 and the second forming station 70 there is a handling station 80 with a multi-axis robot 82, which has a gripping device 84 for gripping a workpiece and for transferring the workpiece from the first forming station 60 to the second forming station 70.
  • the first forming station 60 is designed in accordance with a basically known press-rolling machine with a main spindle which can be driven in rotation and which, in the exemplary embodiment shown, is provided for a vertical arrangement.
  • a starting workpiece is fed laterally into the first forming station 60 via a lateral feed device 68, which can also be a multi-axis robot with a gripping device.
  • the supplied work piece is clamped axially on the main spindle with an at least partially cylindrical forming mandrel by means of a first tailstock spindle.
  • the main spindle is then set in rotation with the first tailstock spindle and at least one forming roller is fed to the workpiece.
  • the forming roller axially overflows a peripheral region of the starting workpiece, so that a cylindrical peripheral wall with a defined reduced wall thickness, also called the target wall thickness, is created.
  • the target wall thickness corresponds to the necessary strength conditions which are required for the folding toothing 20 to be molded.
  • the clamping of the workpiece is released again and the workpiece is removed from the first forming station 60 by means of the multi-axis robot 82 and transferred to the second forming station 70.
  • the preformed workpiece is axially clamped on an internal mandrel with external teeth by means of a second tailstock spindle.
  • a center axis of the workpiece and a rotation axis of the inner mandrel are also directed vertically.
  • the inner mandrel rotates it and at least one profiled toothing roller is then fed radially to the cylindrical peripheral wall of the workpiece.
  • the profile of the gear roller is matched to the profile of the external toothing on the internal mandrel in such a way that the cylindrical peripheral wall is molded or folded into the recesses of the external toothing of the internal mandrel, so to speak.
  • the target wall thickness previously set remains largely unchanged.
  • the fully formed gear part 10 is laterally removed by a removal device 78, which can also have a multi-axis robot with a gripping device.
  • the forming system 50 has a cooling and lubricating device 54 for cooling the hydraulic fluid and a hydraulic station 56 for the various drives, which are in particular hydraulic or electrical drives. Furthermore, a control device 58 is provided, which is arranged in the form of control cabinets.
  • the handling station 80 is preferably provided with a door 86 so that the handling station can be walked on for operating and maintenance purposes. Furthermore, an operating unit 59 with a monitor and an input terminal is preferably arranged on a front side of the forming system 50.
  • FIG. 7 and 8 A second exemplary embodiment of a transmission part 10 produced according to the invention is shown, elongated holes 31 running in the circumferential direction being made in the hub region 6 together with a central opening.
  • impressions 32 are molded into the hub area. These can be designed to be radially directed and serve to additionally stiffen the hub area 6.
  • the impressions 32 can be formed by a correspondingly designed and shaped main spindle before the preforming step or when clamping in the first forming station 60.
  • the fourth embodiment of a transmission part 10 according to the invention Figures 11 and 12 also shows impressions 32 molded into the hub area 6, which are more strongly shaped than in the third exemplary embodiment.
  • a sleeve-shaped hub 34 is arranged on the hub area 6. This sleeve-shaped hub 34 can be formed on the starting workpiece by deep drawing, casting or forging or in some other way.
  • an annular indentation 35 can be formed, which ensures further weight optimization and space optimization.
  • a connecting hub 38 directed inwards toward the toothing region 16 is formed.
  • This can have a first section 41 of larger diameter and a second section 42 of smaller diameter, which are connected to one another by a stepped region.
  • Cross bores or cross openings can be provided in the cylindrical wall of the first section 41.
  • Grooves can be formed on the inside of the cylindrical second section 42, which grooves are designed to form a shaft hub connection.
  • the connecting hub 38 with the first section 41 and the second section 42 can be formed in one piece with the starting workpiece, for example by deep drawing, or alternatively, as in FIG Fig. 16 shown, be produced in two parts by welding.
  • design variants also lie in an alternative design of the folding toothing 20, as in FIGS Figures 17 and 18 is shown. So are in the folding teeth 20 according to the embodiment of the Fig. 17 Cross bores 44 introduced, which are used for example as a clutch plate carrier for the passage of gear oil.
  • axial slots 46 can be made in the folding teeth 20.
  • an edge region 18 can be formed with a material thickening to form an annular stiffening region 19.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Mechanical Operated Clutches (AREA)
EP18214820.5A 2018-12-20 2018-12-20 Procédé et installation de formage permettant de fabriquer une partie d'engrenage en forme de tambour Withdrawn EP3670018A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP18214820.5A EP3670018A1 (fr) 2018-12-20 2018-12-20 Procédé et installation de formage permettant de fabriquer une partie d'engrenage en forme de tambour
JP2019227370A JP7274402B2 (ja) 2018-12-20 2019-12-17 ドラム型ギア部品を製造するための方法および成形システム
US16/721,537 US11504762B2 (en) 2018-12-20 2019-12-19 Method and forming system for producing a drum-shaped gear part
CN201911328870.0A CN111347003A (zh) 2018-12-20 2019-12-20 用于生产鼓形齿轮部分的方法和成形设备

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18214820.5A EP3670018A1 (fr) 2018-12-20 2018-12-20 Procédé et installation de formage permettant de fabriquer une partie d'engrenage en forme de tambour

Publications (1)

Publication Number Publication Date
EP3670018A1 true EP3670018A1 (fr) 2020-06-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP18214820.5A Withdrawn EP3670018A1 (fr) 2018-12-20 2018-12-20 Procédé et installation de formage permettant de fabriquer une partie d'engrenage en forme de tambour

Country Status (4)

Country Link
US (1) US11504762B2 (fr)
EP (1) EP3670018A1 (fr)
JP (1) JP7274402B2 (fr)
CN (1) CN111347003A (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114192646B (zh) * 2020-09-17 2024-03-08 宝山钢铁股份有限公司 一种内外齿零件旋压成形时旋轮齿形轮廓线的设计方法
CN112916726A (zh) * 2020-12-28 2021-06-08 无锡仓佑汽车配件有限公司 一种自动变速箱离合器齿毂内外花键制备工艺
CN114769454B (zh) * 2022-04-20 2023-05-12 华南理工大学 一种柔轮及其强韧化冷加工方法

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US11504762B2 (en) 2022-11-22
JP7274402B2 (ja) 2023-05-16
JP2020104173A (ja) 2020-07-09
US20200197999A1 (en) 2020-06-25
CN111347003A (zh) 2020-06-30

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