EP2842649A1 - A method of rolling extrusion with regulated axis spacing of axi-symmetrical stepped parts - Google Patents

A method of rolling extrusion with regulated axis spacing of axi-symmetrical stepped parts Download PDF

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Publication number
EP2842649A1
EP2842649A1 EP13461569.9A EP13461569A EP2842649A1 EP 2842649 A1 EP2842649 A1 EP 2842649A1 EP 13461569 A EP13461569 A EP 13461569A EP 2842649 A1 EP2842649 A1 EP 2842649A1
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EP
European Patent Office
Prior art keywords
same
semi
finished product
rolls
formed rolls
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EP13461569.9A
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German (de)
French (fr)
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EP2842649B1 (en
Inventor
Jaroslaw Bartnicki
Janusz Tomczak
Zbigniew Pater
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Politechnika Lubelska
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Politechnika Lubelska
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    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/14—Spinning
    • 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

  • the subject of the invention is a method of rolling extrusion with regulated axis spacing of axi-symmetrical stepped parts.
  • the issue of rolling extrusion process with regulated axis spacing , of stepped axi-symmetrical parts is the fact that the formed semi-finished product in the form of a bar or a tube part is placed in the front rotational holder seat and the seat of back rotational holder, next the front rotational holder and back rotational holder together with semi-finished product move with a translational motion with constant velocity into the workspace, which is made by the same three formed rolls , next the same three formed rolls are put into rotational motion in the same direction and with the same velocity, then revolution motion of the same three formed rolls is activated and the same three formed rolls are brought closer to the semi-finished product, yet, rotary movement trajectories of the same three formed rolls are of spiral shape, next the semi-finished product is affected by the formed rolls working surfaces and the semi-finished product is put into rotary motion with constant velocity in the direction opposite to the direction of rotations of the same three formed rolls, and, at the same time the semi-finished product is squeezed by working surfaces and the necking is formed on the
  • An advantage of the invention is the fact that it allows for metal forming of multi-stepped parts of full and hollowed shafts, due to which mechanical characteristics of such manufactured products improve. Thanks to the application of automatic change of the axles distance during rolling extrusion process of parts the process technological possibilities enlarge in comparison with used so far manufacturing methods.
  • the invention gives the opportunity of application of one set of simple rotary tools in the form of rolls for manufacturing of various products, both full and hollowed.
  • the invention is universal and allows for forming of parts from all alloys destined for metal forming.
  • Fig.1 shows the beginning of the process and tools and semi-finished product placement in the front view
  • Fig.2 view from the side of the process and tools at the beginning of rolling extrusion
  • Fig.3 isometric view of the process, tools and semi-finished product at the beginning of rolling extrusion
  • Fig.4 view from the front of the process and tools and part placement at the end of rolling extrusion
  • Fig.5 view of the side of the process and tools at the end of extrusion
  • Fig.6 isometric view of the process, tools and forging at the end of rolling extrusion.
  • the way of rolling extrusion with regulated axis spacing of axi-symmetrical stepped parts is based on that a formed semi-finished product 3 in the form of a bar or tube part is placed in the seat of the front rotary holder 1 and in the seat of the back rotary holder 2 .
  • the front rotational holder 1 and back rotational holder 2 together with semi-finished product 3 move with a translational motion with constant velocity V into the workspace.
  • the workspace is made by the same three 4a , 4b and 4c formed rolls.
  • the same three 4a , 4b and 4c formed rolls are put into rotational motion in the same direction and with the same velocity n 1 .
  • revolution motion of the same three 4a , 4b and 4c formed rolls is activated with the velocity n 2 and the same three 4a , 4b and 4c formed rolls are brought closer to the semi-finished product 3 .
  • Rotary movement trajectories 7a , 7b and 7c of the same three 4a , 4b and 4c formed rolls are of spiral shape.
  • the semi-finished product 3 is affected by the 4a , 4b and 4c formed rolls working 4a 1 , 4a 2 , 4b 1 , 4b 2 , 4c 1 and 4c 2 surfaces and the semi-finished product 3 is put into rotary motion with constant velocity n 3 in the direction opposite to the direction of rotations of the same three 4a , 4b and 4c formed rolls.
  • the semi-finished product 3 is squeezed by working 4a 1 , 4a 2 , 4b 1 , 4b 2 , 4c 1 and 4c 2 surfaces and the necking 5 is formed on the part circumference 6 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Abstract

The way of rolling extrusion with regulated axis spacing of axi-symmetrical stepped parts is characterized in that a formed semi-finished product (3) in the form of a bar or tube part is placed in the seat of the front rotary holder (1) and in the seat of the back rotary holder (2), next, the front rotational holder (1) and back rotational holder (2) together with semi-finished product (3) move with a translational motion with constant velocity (V) into the workspace, which is made by the same three (4a), (4b) and (4c) formed rolls, next the same three (4a), (4b) and (4c) formed rolls are put into rotational motion in the same direction and with the same velocity (n 1), then revolution motion of the same three (4a), (4b) and (4c) formed rolls is activated with the velocity (n 2) and the same three (4a), (4b) and (4c) formed rolls are brought closer to the semi-finished product (1), yet rotary movement trajectories (7a), (7b) and (7c) of the same three (4a), (4b) and (4c) formed rolls are of spiral shape, next the semi-finished product (3) is affected by the (4a), (4b) and (4c) formed rolls working (4a 1), (4a 2), (4b 1 ), (4b 2), (4c 1) and (4c 2) surfaces and the semi-finished product (3) is put into rotary motion with constant velocity (n 3) in the direction opposite to the direction of rotations of the same three (4a), (4b) and (4c) formed rolls.

Description

  • The subject of the invention is a method of rolling extrusion with regulated axis spacing of axi-symmetrical stepped parts.
  • Until now, there exist and are applied numerous methods of axi-symmetrical stepped forgings manufacturing, full and hollowed, which are used as semi-finished products of stepped shafts, sleeves and others. The most widely applied methods include: die forging on presses and hammers, drawing, forging and piercing, rotary swaging, rotary forging, internal high pressure forming, rolling extrusion in cold, rolling extrusion in cold with deep drilling and cross-wedge rolling. These processes are described in details in the literature by Bartnicki. J, Pater Z. "Cross-wedge processes of hollowed products", ed. Lublin University of Technology, Lublin 2005. As it is given by the authors, the largest products precision is obtained in the drawing processes, however, limits connected with this technology application for manufacturing of hollowed parts are small possibilities within the scope of the obtained elements shapes. The forging technology finds application only in the case of forming of shafts with large dimensions and weight. Yet, piercing is used for thick-walled and short sleeve production. Swaging processes allow for reduction of bars and tubes diameters. Parts formed by means of that method are characterized by large precision, and, at forging on a mandrel, they can possess very accurate cylindrical and conical holes. Another method of hollowed parts manufacturing is hydrostatic extrusion, which allows for forming of products of assumed geometry. In this method, a product is formed under high pressure caused in the element inside. Cold extrusion processes are widely applied in industry for manufacturing of hollowed parts, they form due to extruding by the die hole on mandrel. Recently, numerous ways of forming of hollowed parts basing on cross-wedge rolling and wedge-rolls rolling methods have been worked out. In the cross-wedge rolling and wedge-rolls rolling methods at least one of the forming tools constitutes a flat wedge rolled on a roll, which reduces billet diameter by driving into it, displacing certain metal volume at sides. In the result the product undergoes elongation during forming and the wall thickness in the area of the formed necking lowers. This leads to the product weakening in the area of the rolled step and imposes application of thick-walled billets, which can be formed only in hot conditions Additionally, this method requires usage of complex wedge tools of large dimensions, which results in large implementation costs of the cross-wedge rolling technology.
  • From Polish patent claim number P.392275 is well known a way of rolling extrusion of hollowed parts, which is based on forming of a semi-finished part in the form of a sleeve or a tube part between three rotating tools. Yet, one of the tools or all tools move additionally in the direction of the semi-finished part axis, putting it into rotation and reducing particular steps of formed multi-stepped shaft. A characteristic feature of this process is tools outline representation on the part external surface, in the result of which section reduction and increase of the product wall thickness take place.
  • From Polish patent claim number P.393242 is known a way of forming of hollowed products be means of rolling extrusion, which is based on forming of axi-symmetrical hollowed parts from a semi-finished product in the form of a tube. In the described in the claim rolling extrusion process, the semi-finished product is placed in the rotational head, later, it is displaced into the direction of three rotational tools, which are placed around the billet axis every 120°. In the result of tools action, the diameter of external billet pivot is reduced and hollowed stepped part is obtained.
  • The issue of rolling extrusion process with regulated axis spacing , of stepped axi-symmetrical parts, is the fact that the formed semi-finished product in the form of a bar or a tube part is placed in the front rotational holder seat and the seat of back rotational holder, next the front rotational holder and back rotational holder together with semi-finished product move with a translational motion with constant velocity into the workspace, which is made by the same three formed rolls , next the same three formed rolls are put into rotational motion in the same direction and with the same velocity, then revolution motion of the same three formed rolls is activated and the same three formed rolls are brought closer to the semi-finished product, yet, rotary movement trajectories of the same three formed rolls are of spiral shape, next the semi-finished product is affected by the formed rolls working surfaces and the semi-finished product is put into rotary motion with constant velocity in the direction opposite to the direction of rotations of the same three formed rolls, and, at the same time the semi-finished product is squeezed by working surfaces and the necking is formed on the part circumference.
  • An advantage of the invention is the fact that it allows for metal forming of multi-stepped parts of full and hollowed shafts, due to which mechanical characteristics of such manufactured products improve. Thanks to the application of automatic change of the axles distance during rolling extrusion process of parts the process technological possibilities enlarge in comparison with used so far manufacturing methods. The invention gives the opportunity of application of one set of simple rotary tools in the form of rolls for manufacturing of various products, both full and hollowed. The invention is universal and allows for forming of parts from all alloys destined for metal forming.
  • The invention is presented in the example of realization in figure, in which Fig.1 shows the beginning of the process and tools and semi-finished product placement in the front view, Fig.2-view from the side of the process and tools at the beginning of rolling extrusion, Fig.3-isometric view of the process, tools and semi-finished product at the beginning of rolling extrusion, Fig.4-view from the front of the process and tools and part placement at the end of rolling extrusion, Fig.5-view of the side of the process and tools at the end of extrusion, yet, Fig.6-isometric view of the process, tools and forging at the end of rolling extrusion.
  • The way of rolling extrusion with regulated axis spacing of axi-symmetrical stepped parts is based on that a formed semi-finished product 3 in the form of a bar or tube part is placed in the seat of the front rotary holder 1 and in the seat of the back rotary holder 2. Next, the front rotational holder 1 and back rotational holder 2 together with semi-finished product 3 move with a translational motion with constant velocity V into the workspace. The workspace is made by the same three 4a, 4b and 4c formed rolls. Next the same three 4a, 4b and 4c formed rolls are put into rotational motion in the same direction and with the same velocity n 1. Then revolution motion of the same three 4a, 4b and 4c formed rolls is activated with the velocity n 2 and the same three 4a, 4b and 4c formed rolls are brought closer to the semi-finished product 3. Rotary movement trajectories 7a, 7b and 7c of the same three 4a,4b and 4c formed rolls are of spiral shape. Next the semi-finished product3 is affected by the 4a, 4b and 4c formed rolls working 4a 1, 4a 2, 4b 1, 4b 2, 4c 1 and 4c 2 surfaces and the semi-finished product3 is put into rotary motion with constant velocity n 3 in the direction opposite to the direction of rotations of the same three 4a, 4b and 4c formed rolls. At the same time the semi-finished product 3 is squeezed by working 4a 1, 4a 2, 4b 1, 4b 2, 4c 1 and 4c 2 surfaces and the necking 5 is formed on the part circumference 6.

Claims (1)

  1. The way of rolling extrusion with regulated axis spacing of axi-symmetrical stepped parts characterized in that a formed semi-finished product (3) in the form of a bar or tube part is placed in the seat of the front rotary holder (1) and in the seat of the back rotary holder (2), next, the front rotational holder (1) and back rotational holder ( 2) together with semi-finished product (3 )move with a translational motion with constant velocity ( V ) into the workspace, which is made by the same three (4a), (4b) and (4c) formed rolls, next the same three (4a), (4b) and( 4c) formed rolls are put into rotational motion in the same direction and with the same velocity (n 1), then revolution motion of the same three (4a), (4b) and (4c) formed rolls is activated with the velocity( n 2) and the same three( 4a), (4b) and (4c) formed rolls are brought closer to the semi-finished product( 3), yet rotary movement trajectories (7a), (7b) and (7c )of the same three (4a), (4b) and (4c) formed rolls are of spiral shape, next the semi-finished product (3) is affected by the (4a), (4b) and (4c) formed rolls working (4a 1), (4a 2), (4b 1), (4b 2), (4c 1) and (4c 2) surfaces and the semi-finished product (3) is put into rotary motion with constant velocity( n 3) in the direction opposite to the direction of rotations of the same three (4a), (4b) and (4c) formed rolls and at the same time the semi-finished product (3) is squeezed by working (4a 1), (4a 2), (4b 1), (4b 2), (4c 1) and (4c 2) surfaces and the necking (5) is formed on the part circumference (6).
EP13461569.9A 2013-06-12 2013-12-30 A method of rolling extrusion with regulated axis spacing of axi-symmetrical stepped parts Not-in-force EP2842649B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL404294A PL224268B1 (en) 2013-06-12 2013-06-12 Method for the rotatry pushing with adjustable wheel base of graded axisymmetric forgings

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EP2842649A1 true EP2842649A1 (en) 2015-03-04
EP2842649B1 EP2842649B1 (en) 2016-05-18

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114160605A (en) * 2021-10-28 2022-03-11 首都航天机械有限公司 Forming device and method suitable for variable-section pipe
WO2022122645A1 (en) * 2020-12-07 2022-06-16 Winkelmann Powertrain Components Gmbh & Co. Kg Process for manufacturing a rotor shaft
US11484924B2 (en) 2019-04-30 2022-11-01 University Of Science And Technology Beijing Device and method for forming shaft part by two-roller flexible skew rolling

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58110137A (en) * 1981-12-24 1983-06-30 Toshiba Corp Spinning method
US20030140674A1 (en) * 2001-04-18 2003-07-31 Yukinori Suzuki Spindle mechanism
EP2422896A1 (en) * 2010-08-30 2012-02-29 Politechnika Lubelska Method for rotary compression of hollow parts by cross rolling
PL393242A1 (en) 2010-12-13 2012-06-18 Politechnika Lubelska Method for forming hollow products by means of rolling-extrusion process

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3144695A1 (en) 1981-11-06 1983-05-19 Mitsubishi Jukogyo K.K., Tokyo METHOD FOR ROLLING CAVES
DE102007041149B3 (en) 2007-08-30 2009-04-02 Technische Universität Dresden Method and device for cross rolling stepped hollow shafts or cylindrical hollow parts from a tube
DE502008000404D1 (en) 2008-05-26 2010-04-08 Repkon Machine And Tool Indust Process for the production of workpieces and flow-forming machine
EP2210682B1 (en) 2009-07-09 2012-03-14 Leifeld Metal Spinning AG Method and apparatus for spinning
PL216312B1 (en) 2010-08-30 2014-03-31 Lubelska Polt Apparatus for rotary necking of hollow products

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58110137A (en) * 1981-12-24 1983-06-30 Toshiba Corp Spinning method
US20030140674A1 (en) * 2001-04-18 2003-07-31 Yukinori Suzuki Spindle mechanism
EP2422896A1 (en) * 2010-08-30 2012-02-29 Politechnika Lubelska Method for rotary compression of hollow parts by cross rolling
PL392275A1 (en) 2010-08-30 2012-03-12 Politechnika Lubelska Method for rotary necking of hollow products by transverse rolling
PL393242A1 (en) 2010-12-13 2012-06-18 Politechnika Lubelska Method for forming hollow products by means of rolling-extrusion process

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
BARTNICKI. J; PATER Z.: "Cross-wedge processes of hollowed products", 2005

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11484924B2 (en) 2019-04-30 2022-11-01 University Of Science And Technology Beijing Device and method for forming shaft part by two-roller flexible skew rolling
WO2022122645A1 (en) * 2020-12-07 2022-06-16 Winkelmann Powertrain Components Gmbh & Co. Kg Process for manufacturing a rotor shaft
CN114160605A (en) * 2021-10-28 2022-03-11 首都航天机械有限公司 Forming device and method suitable for variable-section pipe
CN114160605B (en) * 2021-10-28 2024-05-31 首都航天机械有限公司 Forming device and method suitable for variable-section pipe

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Publication number Publication date
PL224268B1 (en) 2016-12-30
PL404294A1 (en) 2014-12-22
EP2842649B1 (en) 2016-05-18

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