EP2422896B1 - Method for rotary compression of hollow parts by cross rolling - Google Patents

Method for rotary compression of hollow parts by cross rolling Download PDF

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Publication number
EP2422896B1
EP2422896B1 EP20110461502 EP11461502A EP2422896B1 EP 2422896 B1 EP2422896 B1 EP 2422896B1 EP 20110461502 EP20110461502 EP 20110461502 EP 11461502 A EP11461502 A EP 11461502A EP 2422896 B1 EP2422896 B1 EP 2422896B1
Authority
EP
European Patent Office
Prior art keywords
hollow
rolls
velocity
shafts
rotary compression
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.)
Not-in-force
Application number
EP20110461502
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2422896A1 (en
Inventor
Zbigniew Pater
Janusz Tomczak
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.)
Politechnika Lubelska
Original Assignee
Politechnika Lubelska
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 Politechnika Lubelska filed Critical Politechnika Lubelska
Publication of EP2422896A1 publication Critical patent/EP2422896A1/en
Application granted granted Critical
Publication of EP2422896B1 publication Critical patent/EP2422896B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H1/00—Making articles shaped as bodies of revolution
    • B21H1/18—Making articles shaped as bodies of revolution cylinders, e.g. rolled transversely cross-rolling

Definitions

  • This invention relates to a method for rotary compression of hollow parts by cross rolling, in particular of hollow shafts and axles.
  • the notion of "hollow part” is to be understood as a tubular element which has a cylindrical or shaped hole located centrally along its axis.
  • JP-A-63040631 discloses a method for rotary compression of a hollow part by cross-rolling, in which the hollow workpiece is clamped in a chuck and rolled by three working rolls, which are moved radially towards the axis of the workpiece.
  • the product is elongated during forming and its wall-thickness in the necking zone is decreased.
  • the method requires the use of complex wedge tools of large overall dimensions, which results in high implementation costs of the cross wedge rolling technology.
  • the essence of the method for rotary compression of hollow parts by cross rolling, especially of hollow axles and shafts, lies in that the hollow part to be formed - the blank - in the form of a tube, is positioned on two powered working rolls - the tools - , which rotate in the same direction with a first constant velocity, while the third, upper roll rotates with the first constant velocity in the same direction as the other rolls and radially moves in a reciprocating manner with a second constant velocity, and as a result of this motion the rolls approach one another in such a way so as to be positioned in the final phase of the sizing process at every 120° +/- 20°, the preferable position being that at every 120°, then the plane motion of the upper roll is stopped, and the three rotating rolls eventually correct shape inaccuracies of the hollow part.
  • One beneficial effect of the invention is that it allows for the application of simple forming tools based on three rolls which can be manufactured at a relatively low cost to produce such parts as hollow stepped shafts.
  • Hollow parts are more and more often used in machine constructions, in automotive industry, and particularly in aerospace industry. Owing to the use of such parts, the construction mass of elements can be decreased, while their strength and functional properties are at the same time retained.
  • thick-walled tubes can be used as the blank, which makes additional drilling operations unnecessary as well as it eliminates material loss which occurs during machining. Additionally, it is possible to obtain the finished product - the stepped shaft, from the blank in the form of a tube section within one plastic forming operation.
  • the formed hollow shaft will have a more advantageous structure, which will improve strength properties of the part.
  • Another beneficial effect of the invention is the fact that during compression, the material flows mainly in the radial direction, which increases the wall-thickness of the shaft in the necking zone and, thus, increases strength properties of the part.
  • One more beneficial effect of the method is its universality, as the method can be used to form all metals and alloys which are suitable for metal machining.
  • the method for rotary compression of hollow parts consists in positioning the blank 1 in the form of a tube section on two working rolls 2 and 3 - the tools.
  • the rolls 2 and 3 begin to rotate in the same direction with the first velocity n 1
  • the upper roll 4 moves radially in a reciprocating manner with the second velocity V towards the axis of the blank 1 .
  • the rolls 2 , 3 , 4 - the tools - relatively approach one another in such a way that in the final phase of the sizing process they are positioned at every 120°.
  • the rotational motion of the working rolls 2 , 3 , 4 makes the blank 1 rotate around its axis with the third velocity n 2 , at the same time the rolls 2 , 3 , 4 - the tools -, relatively shift in the radial direction forming on the surface of the blank 1 a profile of the finished product 5 .
  • the progressive motion of the upper roll 4 is stopped, while the three working rolls 2 , 3 , 4 still rotate and eventually form the ultimate shape of the rolled product 5 , removing surface irregularities which have occurred at the beginning of the process.
  • the shape of the rolling tools 2 , 3 and 4 mirrors in the contact phase the shape of the finished product 5 .
  • the shape of the compressed hollow shaft is formed on the contact boundary of consecutive points marked by the rotating tools, which allows for rolling of products of different diameters.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
EP20110461502 2010-08-30 2011-01-03 Method for rotary compression of hollow parts by cross rolling Not-in-force EP2422896B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL392275A PL216310B1 (pl) 2010-08-30 2010-08-30 Sposób obciskania obrotowego wyrobów drążonych metodą walcowania poprzecznego

Publications (2)

Publication Number Publication Date
EP2422896A1 EP2422896A1 (en) 2012-02-29
EP2422896B1 true EP2422896B1 (en) 2013-11-13

Family

ID=45057312

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20110461502 Not-in-force EP2422896B1 (en) 2010-08-30 2011-01-03 Method for rotary compression of hollow parts by cross rolling

Country Status (2)

Country Link
EP (1) EP2422896B1 (pl)
PL (1) PL216310B1 (pl)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3733322A1 (en) 2019-04-30 2020-11-04 University Of Science And Technology Beijing Device and method for forming shaft part by two-roller flexible skew rolling

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL224268B1 (pl) 2013-06-12 2016-12-30 Lubelska Polt Sposób przepychania obrotowego z regulowanym rozstawem osi stopniowanych odkuwek osiowosymetrycznych
CN105170645B (zh) * 2015-09-08 2017-04-26 战广斌 一种轴类件三辊楔横轧机

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3144695A1 (de) * 1981-11-06 1983-05-19 Mitsubishi Jukogyo K.K., Tokyo Verfahren zum walzen von hohlen gebilden
JPS59120336A (ja) * 1982-12-27 1984-07-11 Honda Motor Co Ltd クランクシヤフトの製造方法
JPS6340631A (ja) * 1986-04-09 1988-02-22 Takayama Seisakusho:Kk 転造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3733322A1 (en) 2019-04-30 2020-11-04 University Of Science And Technology Beijing Device and method for forming shaft part by two-roller flexible skew rolling

Also Published As

Publication number Publication date
PL216310B1 (pl) 2014-03-31
PL392275A1 (pl) 2012-03-12
EP2422896A1 (en) 2012-02-29

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