EP1005932A2 - Procédé et dispositif pour la formation plastique d'un cylindre creux à denture intérieure - Google Patents

Procédé et dispositif pour la formation plastique d'un cylindre creux à denture intérieure Download PDF

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Publication number
EP1005932A2
EP1005932A2 EP99106390A EP99106390A EP1005932A2 EP 1005932 A2 EP1005932 A2 EP 1005932A2 EP 99106390 A EP99106390 A EP 99106390A EP 99106390 A EP99106390 A EP 99106390A EP 1005932 A2 EP1005932 A2 EP 1005932A2
Authority
EP
European Patent Office
Prior art keywords
blank
pin
press
diameter
counter bearing
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Withdrawn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
EP99106390A
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German (de)
English (en)
Other versions
EP1005932A3 (fr
Inventor
Erfindernennung liegt noch nicht vor Die
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.)
SMS Group GmbH
Original Assignee
SMS Eumuco 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 SMS Eumuco GmbH filed Critical SMS Eumuco GmbH
Priority to JP11319784A priority Critical patent/JP2000153335A/ja
Publication of EP1005932A2 publication Critical patent/EP1005932A2/fr
Publication of EP1005932A3 publication Critical patent/EP1005932A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/12—Forming profiles on internal or external surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/28—Making machine elements wheels; discs
    • B21K1/30—Making machine elements wheels; discs with gear-teeth

Definitions

  • the invention relates to a method and a device for plastic shaping a hollow cylinder with internal teeth in a press die by means of a Ram.
  • an external toothing is used Mandrel guided in a hollow cylinder.
  • a segment ring made up of individual conical elements is placed around this hollow cylinder and subjected to radial pressure.
  • the material is in the external teeth of the Dorns pressed.
  • This method shows the disadvantage that the construction of the Tools is very complicated, especially that of the segment ring.
  • the teeth of the mandrel wear unevenly the mentioned disadvantage of a lack of dimensional accuracy.
  • by the inevitably existing joint between the segments a bulge the outer surface of the hollow ring by pressing the segment ring between determine the individual segments with a complex post-processing of the gear is connected.
  • EP 0 356 118 B1 describes a method for introducing internal teeth in a round hollow body known as a cold forming process. It becomes an annular one Hollow cylinder in a press die, which comprises a form ring, on a dome laid with external teeth. By means of an annular stamp, the Hollow cylinder pressed along the space between the form ring and mandrel.
  • the object of the invention to propose an extrusion method and a device to the non-cutting production of round bodies with large dimensions with a cylindrical To enable internal gearing with the least possible post-processing.
  • a cylindrical blank with a central bore is inserted into the press die, which has an annular casing and a counter bearing includes that the ram, which consists of an upstream pin and a gear cutting tool is placed on the blank, the Gear cutting tool on its outer circumference with the profile of the desired one Internal toothing is provided.
  • the peg whose Diameter the inside diameter of the blank with a slight undersize corresponds to the blank without forming and then the gear cutting tool is pressed into the blank and the pin dips into a deepening of the counter bearing.
  • the material of the blank flows in the opposite direction the direction of pressure, and due to the leading pin, a fluid movement prevented in the cavity of the blank.
  • the pin length is defined so that the pin end to none Time of the pressing process with a range of the blank inside diameter is in contact at which the yield stress of the blank material is reached.
  • the material only flows in material areas above the end of the spigot instead of. This prevents the material from being pushed backwards guaranteed the printing direction. Material is prevented from flowing forward.
  • the spigot length is therefore dependent on the selected pressure and the material properties to determine.
  • the Length does not exceed the height of the blank, must also be guaranteed be that on the inner surface of the blank not supported by the pin the yield stress of the material is not reached.
  • the pin is longer than the height of the blank.
  • the pin preferably consists of wear-resistant steel, in particular it is provided with a surface hardening.
  • the blank to be formed must be a hollow cylinder, for example a ring-rolled stock.
  • the toothing tool has a corresponding one straight tooth profile.
  • the profiled length of the gear cutting tool corresponds approximately to the height of the blank.
  • the press blank can be dimensioned so that it fits into the die with one ring-shaped jacket and a counter bearing or floor can be inserted.
  • the outer diameter of the press blank is dimensioned so that it is smaller is the inside diameter of the die shell.
  • the counter bearing on which the blank comes to rest is preferably as Ejector unit trained.
  • the Press the ram out with a toothing tool and pin from the press die.
  • the now internally toothed round body is moved in the direction of the press ram movable ejector unit, the outer diameter of which approximately Corresponds to the inside diameter of the die, detached from the die jacket and ejected.
  • the ejector unit therefore serves on the one hand as a counter bearing, on the other hand to eject the workpiece.
  • the die jacket surrounding the die receiving ring stripper provided hold the workpiece in position when retracting the punch and thus from Wipe off gear cutting tool.
  • a bore is preferably provided in the counter bearing with an opening in the depression. This serves as a ventilation hole for the outlet of the compressed air. Further it serves as a blow-out option, for cooling and / or lubrication.
  • the left part of the figure shows the pressing device with inserted in the pressing die Workpiece before the forming process.
  • the right part of the figure shows the process of Backward extrusion.
  • a preformed ring is produced as the starting material or blank 8 for example by ring rolling.
  • This ring is in the die inserted.
  • the die essentially consists of an annular jacket 3, which is inserted in a die receiving ring and from a counter bearing 4 or floor.
  • the counter bearing 4 is an ejector unit, in particular an ejector disk, executed. It is through the press table 5 to the loading side movable there.
  • the counter bearing 4 has a cylindrical recess 7 on. The diameter of the recess corresponds at most to the inside diameter of the preformed ring.
  • wipers 9a and b are provided on the upper end face of the die.
  • the press ram 1 which is attached to a press ram 2, acts as a counterpart to die, ejector unit and wipers.
  • the press ram 1 comprises a gear cutting tool 1a with a tooth profile 6 and a pin 1b.
  • the cone is designed as a smooth cylinder.
  • the diameter of the pin corresponds to that Inner diameter of the ring used with a slight undersize and accordingly also the diameter of the cylindrical recess 7 in the ejector unit.
  • the base circle of the profile corresponds to the diameter of the pin.
  • the tip circle of the profile is larger than the inside diameter of the ring. It corresponds the desired maximum inside diameter of the internally toothed ring.
  • the length of the pin 1b corresponds in the embodiment shown to approximately half the blank height. With this pin length, it must be ensured that the yield stress is not reached during the forming process on the inner surface of the blank that is not supported by the pin, ie the free surface A f . In a preferred embodiment, the length of the pin is greater than the height of the ring used.
  • a ventilation hole is located in the counter bearing or ejector unit 4 towards the recess 7 10 provided.
  • the press ram 1 During the downward stroke of the press, the press ram 1 is placed on the workpiece, by immersing the pin 1b into the bore of the blank 8 without forming and then the gear cutting tool 1a on the inside diameter attacks the blank. Only when the profiled part 1a of the press ram is used Ring reached, it is reshaped. When retracting the gear cutting tool 1a is the material of the blank against the printing direction repressed. If the blank outer diameter is smaller than the inner die diameter, the preformed ring widens radially outwards to Wall of the annular die jacket 3. Because further expansion is limited is, the remaining part of the volume in the profiled teeth 6 of the ram 1 ousted. By means of the leading pin 1b there is a flow movement prevented in the cavity of the ring. The peg acts as a barrier and supports a backward flow movement of the material.
  • the end product is a ring with internal teeth. It is through appropriate Choice of the inner diameter of the ring possible that the internal toothing that forms not reached the reason in the tooth profile of the ram. If necessary, a post-processing step can follow.
  • the use of materials in the forming according to the proposed dimension becomes large Method reduced using the proposed device.
  • the steel forming process takes place in a temperature range from 800 to 1100 ° C.
  • the gears formed with the proposed pressing device can be used especially in large construction machines.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
EP99106390A 1998-11-13 1999-03-27 Procédé et dispositif pour la formation plastique d'un cylindre creux à denture intérieure Withdrawn EP1005932A3 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11319784A JP2000153335A (ja) 1998-11-13 1999-11-10 内歯を備えた中空円筒体を塑性的に成形する方法および装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19852261 1998-11-13
DE19852261 1998-11-13

Publications (2)

Publication Number Publication Date
EP1005932A2 true EP1005932A2 (fr) 2000-06-07
EP1005932A3 EP1005932A3 (fr) 2001-08-29

Family

ID=7887611

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99106390A Withdrawn EP1005932A3 (fr) 1998-11-13 1999-03-27 Procédé et dispositif pour la formation plastique d'un cylindre creux à denture intérieure

Country Status (1)

Country Link
EP (1) EP1005932A3 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003080271A1 (fr) * 2002-03-26 2003-10-02 New Form Tec Gmbh Procede de production d'une piece annulaire dotee d'une denture interne, notamment d'un baladeur, et dispositif correspondant
CN102896268A (zh) * 2011-07-29 2013-01-30 Skf公司 在轮毂内圈上形成前齿圈的方法
DE102011122144A1 (de) 2011-12-22 2013-06-27 Volkswagen Aktiengesellschaft Vorrichtung zur spanlosen, insbesondere axial umformenden Ausbildung einer Innenverzahnung an einem Werkstück, insbesondere an einer Hohlwelle bzw. entsprechendes Verfahren
CN108421838A (zh) * 2018-04-09 2018-08-21 南京坚固高中压阀门制造有限公司 高中压焊接球阀阀杆套一次性成型模具
CN114273571A (zh) * 2021-12-01 2022-04-05 中北大学 一种带内网格筋筒形件辊挤成形模具

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4452060A (en) * 1981-04-22 1984-06-05 Hitachi, Ltd. Method of processing cylindrical surface
EP0322770A2 (fr) * 1987-12-26 1989-07-05 M. H. Center, Ltd. Procédé et appareil pour le formage de roues à denture intérieure hélicoidale et de roues à denture hélicoidale
EP0356118A2 (fr) * 1988-08-15 1990-02-28 Ford Motor Company Limited Procédé pour estampage à froid pour un engrenage hélicoidal intérieur
US5325698A (en) * 1992-09-30 1994-07-05 Ford Motor Company Stepped extrusion die assembly
JPH079066A (ja) * 1991-09-24 1995-01-13 Suzuki Motor Corp 押出し成形装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4452060A (en) * 1981-04-22 1984-06-05 Hitachi, Ltd. Method of processing cylindrical surface
EP0322770A2 (fr) * 1987-12-26 1989-07-05 M. H. Center, Ltd. Procédé et appareil pour le formage de roues à denture intérieure hélicoidale et de roues à denture hélicoidale
EP0356118A2 (fr) * 1988-08-15 1990-02-28 Ford Motor Company Limited Procédé pour estampage à froid pour un engrenage hélicoidal intérieur
JPH079066A (ja) * 1991-09-24 1995-01-13 Suzuki Motor Corp 押出し成形装置
US5325698A (en) * 1992-09-30 1994-07-05 Ford Motor Company Stepped extrusion die assembly

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 04, 31. Mai 1995 (1995-05-31) & JP 07 009066 A (SUZUKI MOTOR CORP;OTHERS: 04), 13. Januar 1995 (1995-01-13) *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003080271A1 (fr) * 2002-03-26 2003-10-02 New Form Tec Gmbh Procede de production d'une piece annulaire dotee d'une denture interne, notamment d'un baladeur, et dispositif correspondant
US7168281B2 (en) 2002-03-26 2007-01-30 Neumayer Tekfor Gmbh Method for producing an annular element comprising an inner toothing, especially a sliding sleeve, and device for carrying out the method
CN102896268A (zh) * 2011-07-29 2013-01-30 Skf公司 在轮毂内圈上形成前齿圈的方法
CN102896268B (zh) * 2011-07-29 2016-09-07 Skf公司 在轮毂内圈上形成前齿圈的方法
DE102011122144A1 (de) 2011-12-22 2013-06-27 Volkswagen Aktiengesellschaft Vorrichtung zur spanlosen, insbesondere axial umformenden Ausbildung einer Innenverzahnung an einem Werkstück, insbesondere an einer Hohlwelle bzw. entsprechendes Verfahren
DE102011122144B4 (de) 2011-12-22 2022-11-24 Volkswagen Aktiengesellschaft Vorrichtung und Verfahren zur spanlosen, axial umformenden Ausbildung einer Innenverzahnung an einem Werkstück
CN108421838A (zh) * 2018-04-09 2018-08-21 南京坚固高中压阀门制造有限公司 高中压焊接球阀阀杆套一次性成型模具
CN114273571A (zh) * 2021-12-01 2022-04-05 中北大学 一种带内网格筋筒形件辊挤成形模具
CN114273571B (zh) * 2021-12-01 2024-03-22 中北大学 一种带内网格筋筒形件辊挤成形模具

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Publication number Publication date
EP1005932A3 (fr) 2001-08-29

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