EP1909991A1 - Ring rolling from metal blanks - Google Patents

Ring rolling from metal blanks

Info

Publication number
EP1909991A1
EP1909991A1 EP06765239A EP06765239A EP1909991A1 EP 1909991 A1 EP1909991 A1 EP 1909991A1 EP 06765239 A EP06765239 A EP 06765239A EP 06765239 A EP06765239 A EP 06765239A EP 1909991 A1 EP1909991 A1 EP 1909991A1
Authority
EP
European Patent Office
Prior art keywords
growth control
rolls
mandrel axis
axis
mandrel
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.)
Granted
Application number
EP06765239A
Other languages
German (de)
French (fr)
Other versions
EP1909991B1 (en
Inventor
Andrew J. L. Harrison
Jason Michael Paul Hannis
David Alexander Wilding
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.)
Hoerbiger Antriebstechnik Holding GmbH
Original Assignee
Formflo Ltd
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 Formflo Ltd filed Critical Formflo Ltd
Publication of EP1909991A1 publication Critical patent/EP1909991A1/en
Application granted granted Critical
Publication of EP1909991B1 publication Critical patent/EP1909991B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B21H1/06—Making articles shaped as bodies of revolution rings of restricted axial length
    • B21H1/12—Making articles shaped as bodies of revolution rings of restricted axial length rings for ball or roller bearings

Definitions

  • This invention relates to the ring rolling of metal blanks.
  • the blanks are typically of standard steels such as wrought steels, but could comprise other metals or alloys. They can be rolled to form rings having many uses, particularly bearing components.
  • the invention may also be applied to powder metal blanks.
  • the metal blank is mounted on a mandrel located between two forming rolls either side of the mandrel axis.
  • Growth control rolls are disposed above and below the mandrel axis to engage the blank as it turns between the forming rolls.
  • Four growth roll controls are used; one directly above another between the mandrel axis and each forming roll.
  • This process has produced good results with very good quality roundness in the final product.
  • the process does generate lobes.
  • the present invention seeks to further reduce the generation of lobes, and thereby further improve the roundness of the ring rolled product.
  • the growth control rolls are arranged above, below and on either side of the mandrel axis to generate a less symmetric pattern of forces acting on the ring blank with more of the horizontal forces being resolved between the upper or the lower growth control rolls and the forming rolls.
  • the preferred arrangement has the pair of upper growth control rolls with their axes parallel to but closer than those of the lower rolls.
  • the lower pair of growth control rolls can be closer together than the upper pair.
  • the upper and lower growth control rolls will normally be arranged with their axes equidistant on either side of the vertical plane containing the mandrel axis.
  • the two upper growth controls can be replaced by a single growth control with its axis disposed directly over the mandrel axis.
  • the upper growth control does of course apply only vertical forces to the ring blank with all the horizontal forces being resolved between the lower growth control rolls and the forming rolls.
  • the disposition of the growth control rolls is preferably selected to minimise the length of unsupported blank between peripherally adjacent rolls (forming rolls and growth control rolls).
  • the mandrel axis and the forming rolls are in the same horizontal plane. However, in some applications of the invention there can be some benefit in locating the mandrel axis below the axes of the forming rolls so that there is a vertical component of the forces between the forming rolls and the ring blank.
  • Figure 1 shows a cross-section through ring rolling apparatus adapted to practice the method of the invention
  • Figure 2 shows an alternative apparatus to that of Figure 1 in which the upper growth controls are replaced by a single roll.
  • a metal blank (2) is mounted on a mandrel (4) disposed between two forming rolls (6).
  • the axis (8) of the mandrel (4) is located below the horizontal plane containing the axes (10) of the forming rolls, the line between the axis (8) and each forming roll axis (10) subtending an angle ⁇ with the horizontal.
  • Angle ⁇ is normally no more than 10°, and typically will be no more than 5°. Effective performance has been achieved with angle ⁇ at around 1°.
  • Two lower growth control rolls (12) are disposed beneath the mandrel (4) to engage the metal blank (2) from below.
  • the rolls (12) are arranged symmetrically on either side of the vertical plane containing the mandrel axis (8); equally spaced from that vertical plane.
  • the rolls (12) are mounted on a framework (14) enabling their spacing to be adjusted. It will be appreciated that the diameter of the lower growth control rolls may need to vary depending upon the spacing between them, to avoid interference with either each other or the forming ro ⁇ s.
  • the critical factor is of course the line of engagement with the blank on the mandrel, and the angle ⁇ subtended between the line of engagement and the mandrel axis and the horizontal. This angle ⁇ is typically in the range of 50° to 70°, and normally at least 60°.
  • Two upper growth control rolls (16) are mounted in a framework (18) over the mandrel axis for engaging the blank (2) from above. These rolls (16) are located closer to each other than are the lower growth control (12) but once again their spacing can be altered by movement of their axes in the framework (18).
  • the rolls (16) are also arranged symmetrically on either side of the vertical plane containing the mandrel axis, and the angle ⁇ ' subtended by the line of engagement of the roll (16) and the blank (2) and the mandrel axis relative to the horizontal will of course be greater than the angle ⁇ defined in the location of the lower growth controls.
  • the angle ⁇ 1 is typically in the range of 50° to 80°, normally in the range 65° to 70°.
  • FIG. 1 shows a modification of the arrangement in Figure 1 in which the upper growth control rolls (16) are replaced by a single roll (20). In other respects the arrangement of forming and growth control rolls is the same as in Figure 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Metal Rolling (AREA)

Abstract

A method of rolling a ring from a metal blank comprises mounting the blank (2) on a mandrel (4) between two forming rolls (6) located on opposite sides of the mandrel axis. A pair of lower growth control rolls (12) are located below and with their axes parallel to and on opposite sides of the mandrel axis (8), and a pair of upper growth control rolls (16) are arranged above and with their axes parallel and on opposite sides of the mandrel axis (8). The spacing between the pair of upper growth control rolls is different from that between the pair of lower growth control rolls. As the ring is rolled, both the forming rolls and the growth control rolls are engaged with it. In a modification of the method, the upper growth control rolls are replaced by a single roll (20) with its axis disposed directly over the mandrel axis.

Description

Ring Rolling From Metal Blanks
This invention relates to the ring rolling of metal blanks. The blanks are typically of standard steels such as wrought steels, but could comprise other metals or alloys. They can be rolled to form rings having many uses, particularly bearing components. The invention may also be applied to powder metal blanks.
In rolling processes of the kind described above, the metal blank is mounted on a mandrel located between two forming rolls either side of the mandrel axis. Growth control rolls are disposed above and below the mandrel axis to engage the blank as it turns between the forming rolls. Four growth roll controls are used; one directly above another between the mandrel axis and each forming roll. This process has produced good results with very good quality roundness in the final product. However, the process does generate lobes. The present invention seeks to further reduce the generation of lobes, and thereby further improve the roundness of the ring rolled product. According to the invention, the growth control rolls are arranged above, below and on either side of the mandrel axis to generate a less symmetric pattern of forces acting on the ring blank with more of the horizontal forces being resolved between the upper or the lower growth control rolls and the forming rolls. The preferred arrangement has the pair of upper growth control rolls with their axes parallel to but closer than those of the lower rolls. However, for some applications of the invention the lower pair of growth control rolls can be closer together than the upper pair.
In the method of the invention the upper and lower growth control rolls will normally be arranged with their axes equidistant on either side of the vertical plane containing the mandrel axis. In one variant of the invention, the two upper growth controls can be replaced by a single growth control with its axis disposed directly over the mandrel axis. In this variant, the upper growth control does of course apply only vertical forces to the ring blank with all the horizontal forces being resolved between the lower growth control rolls and the forming rolls. The disposition of the growth control rolls is preferably selected to minimise the length of unsupported blank between peripherally adjacent rolls (forming rolls and growth control rolls).
In the methods of the invention, the mandrel axis and the forming rolls are in the same horizontal plane. However, in some applications of the invention there can be some benefit in locating the mandrel axis below the axes of the forming rolls so that there is a vertical component of the forces between the forming rolls and the ring blank.
The invention will now be described by way of example and with reference to the accompanying schematic drawings in which:
Figure 1 shows a cross-section through ring rolling apparatus adapted to practice the method of the invention; and
Figure 2 shows an alternative apparatus to that of Figure 1 in which the upper growth controls are replaced by a single roll.
As shown in Figure 1 a metal blank (2) is mounted on a mandrel (4) disposed between two forming rolls (6). The axis (8) of the mandrel (4) is located below the horizontal plane containing the axes (10) of the forming rolls, the line between the axis (8) and each forming roll axis (10) subtending an angle β with the horizontal. Angle β is normally no more than 10°, and typically will be no more than 5°. Effective performance has been achieved with angle β at around 1°.
Two lower growth control rolls (12) are disposed beneath the mandrel (4) to engage the metal blank (2) from below. The rolls (12) are arranged symmetrically on either side of the vertical plane containing the mandrel axis (8); equally spaced from that vertical plane. The rolls (12) are mounted on a framework (14) enabling their spacing to be adjusted. It will be appreciated that the diameter of the lower growth control rolls may need to vary depending upon the spacing between them, to avoid interference with either each other or the forming roϋs. The critical factor is of course the line of engagement with the blank on the mandrel, and the angle θ subtended between the line of engagement and the mandrel axis and the horizontal. This angle θ is typically in the range of 50° to 70°, and normally at least 60°.
Two upper growth control rolls (16) are mounted in a framework (18) over the mandrel axis for engaging the blank (2) from above. These rolls (16) are located closer to each other than are the lower growth control (12) but once again their spacing can be altered by movement of their axes in the framework (18). The rolls (16) are also arranged symmetrically on either side of the vertical plane containing the mandrel axis, and the angle θ' subtended by the line of engagement of the roll (16) and the blank (2) and the mandrel axis relative to the horizontal will of course be greater than the angle θ defined in the location of the lower growth controls. The angle θ1 is typically in the range of 50° to 80°, normally in the range 65° to 70°.
As noted above different sized growth control rolls can be used depending upon the geometry of the desired roll arrangement and of course the size of the ring to be rolled on the forming rolls. Because of the forces involved, the diameter of the growth control rolls should be as much as the geometry allows. The location of the growth control rolls relative to the blank is normally selected such that the spacing between the lines of engagement of the upper rolls (16) is substantially equal to the spacing between each upper roll and the line of engagement of the adjacent forming roll (6). The lower growth control rolls (12) are located in a similarly symmetric arrangement. Figure 2 shows a modification of the arrangement in Figure 1 in which the upper growth control rolls (16) are replaced by a single roll (20). In other respects the arrangement of forming and growth control rolls is the same as in Figure 1.

Claims

1. A method of rolling a ring from a metal blank, comprising mounting the blank on a mandrel between two forming rolls located on opposite sides of the mandrel axis, with a pair of lower growth control rolls located below and with their axes parallel to and on opposite sides of the mandrel axis, and a pair of upper growth control rolls arranged above and with their axes parallel and on opposite sides of the mandrel axis, wherein the spacing between the pair of upper growth control rolls is different from the spacing between the pair of lower growth control rolls; and rolling the ring between the forming rolls with the growth control rings engaging the ring.
2. A method according to Claim 1 wherein the spacing between the pair of upper growth control rolls is less than the spacing between the pair of lower growth control rolls.
3. A method according to Claim 1 or Claim 2, wherein the lower growth control rolls are located relative to the mandrel axis with their axes disposed at an angle in the range 50° to 70° below the horizontal plane containing the mandrel axis.
4. A method according to Claim 3, when said angle is at least 60°.
5. A method according to any preceding Claim, wherein the upper growth control rolls are located relative to the mandrel axis with their axes disposed at an angle in the range 50° to 80° above the horizontal plane containing the mandrel axis.
6. A method according to Claim 4, wherein said angle is in the range 65° to 70°.
7. A modification of a method according to any of Claims 1 to 4, wherein the blank engages with only a single upper growth control roll with its axis disposed directly over the mandrel axis.
8. A method according to preceding Claim, wherein the mandrel axis and the axis of the forming rolls are in the same horizontal plane.
9. A method according to any of Claims 1 to 7, wherein the mandrel axis is disposed below a horizontal plane containing the forming roll axes.
10. A method according to Claim 8, wherein the mandrel axis is disposed at an angle no greater than 10° below the horizontal plane containing the forming roll axis.
11. A method according to Claim 9, wherein the angle is no greater than 5°.
EP06765239A 2005-08-05 2006-08-04 Ring rolling from metal blanks Active EP1909991B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0516221A GB2430173A (en) 2005-08-05 2005-08-05 Ring rolling from metal blanks
PCT/GB2006/002937 WO2007017655A1 (en) 2005-08-05 2006-08-04 Ring rolling from metal blanks

Publications (2)

Publication Number Publication Date
EP1909991A1 true EP1909991A1 (en) 2008-04-16
EP1909991B1 EP1909991B1 (en) 2009-09-30

Family

ID=34984219

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06765239A Active EP1909991B1 (en) 2005-08-05 2006-08-04 Ring rolling from metal blanks

Country Status (8)

Country Link
US (1) US20090120152A1 (en)
EP (1) EP1909991B1 (en)
JP (1) JP4833288B2 (en)
AT (1) ATE444130T1 (en)
DE (1) DE602006009522D1 (en)
ES (1) ES2331855T3 (en)
GB (1) GB2430173A (en)
WO (1) WO2007017655A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4964207B2 (en) * 2008-09-05 2012-06-27 本田技研工業株式会社 Endless strip metal ring rolling equipment
CN102615221B (en) * 2011-12-13 2014-08-20 天马轴承集团股份有限公司 Radial and axial rolling forming method for large-sized double-groove ring piece
DE102014005085A1 (en) * 2014-04-08 2015-10-08 Sms Meer Gmbh Multi-roll table-type rolling mill and method of rolling rings in a multi-roll table-type rolling mill

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1187370A (en) * 1966-01-04 1970-04-08 Rotary Profile Anstalt Improvements relating to the Rolling of Rings
GB1329251A (en) * 1969-12-31 1973-09-05 Nat Res Dev Rolling machines
GB1475779A (en) * 1974-07-24 1977-06-10 Formflo Ltd Rolling operations
GB1475778A (en) * 1974-07-24 1977-06-10 Formflo Ltd Rolling operations
GB1475777A (en) * 1974-07-24 1977-06-10 Formflo Ltd Rolling operations
SU578146A1 (en) * 1975-06-24 1977-10-30 Предприятие П/Я Р-6639 Ring-rolling mill with automatic control of pressure roll actuator
JPS6130206A (en) * 1984-07-20 1986-02-12 Koyo Seiatsu Kk Roll device of annular-metal rolling mill
JPS62279006A (en) * 1986-05-29 1987-12-03 Koichi Hamada Rolling mill for metal endless belt
JPH032328A (en) * 1989-05-30 1991-01-08 Koyo Seiko Co Ltd Manufacture of race for rolling bearing
GB2313334B (en) * 1996-05-24 1999-07-07 Formflo Ltd Rolling annular workpieces
JP2000122310A (en) * 1998-10-14 2000-04-28 Nisshin Unyu Kogyo Kk Production of mirror surface pipe for photorecertive drum of copying machine or the like

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007017655A1 *

Also Published As

Publication number Publication date
GB0516221D0 (en) 2005-09-14
EP1909991B1 (en) 2009-09-30
US20090120152A1 (en) 2009-05-14
DE602006009522D1 (en) 2009-11-12
JP2009502516A (en) 2009-01-29
JP4833288B2 (en) 2011-12-07
GB2430173A (en) 2007-03-21
WO2007017655A1 (en) 2007-02-15
ATE444130T1 (en) 2009-10-15
ES2331855T3 (en) 2010-01-18

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