US3534575A - Apparatus for straightening hot-rolled tubes - Google Patents

Apparatus for straightening hot-rolled tubes Download PDF

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Publication number
US3534575A
US3534575A US651843A US3534575DA US3534575A US 3534575 A US3534575 A US 3534575A US 651843 A US651843 A US 651843A US 3534575D A US3534575D A US 3534575DA US 3534575 A US3534575 A US 3534575A
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US
United States
Prior art keywords
rolls
tubes
roll
straightening
hot
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Expired - Lifetime
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US651843A
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English (en)
Inventor
Hubert De Corta
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Friedrich Kocks GmbH and Co
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Friedrich Kocks GmbH and Co
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Application filed by Friedrich Kocks GmbH and Co filed Critical Friedrich Kocks GmbH and Co
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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
    • B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
    • B21D3/02—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers
    • B21D3/05—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers arranged on axes rectangular to the path of the work
    • 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
    • B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
    • B21D3/02—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers
    • B21D3/04—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers arranged on axes skew to the path of the work

Definitions

  • This invention relates to improvements in apparatus for straightening hot rolled tubes.
  • the apparatus comprises a number of parallel rolls set closely together with their axes horizontal and the rolls are driven to rotate in the same direction.
  • the hot rolled tubes are fed onto the rolls in a plastic or semi-plastic condition with their direction of length substantially parallel to the rolls and move along the rolls, being straightened and cooled in the process.
  • at least some of the rolls are profiled to allow the passage of cooling air between adjacent rolls.
  • Hot rolled tubes generally require to be straightened when they have been formed.
  • a straightening machine of the conventional type generally comprises a set of parallel rolls arranged as closely together as possible with their axes horizontal and driven in such a way that they all rotate in the same direction. These rolls, which usually have a distinctly larger diameter than that of the tubes it is required to straighten, are internally cooled by water circulation.
  • the tubes to be straightened the temperature of which may be 850 C. to 900 C., for example, are in a plastic or semi-plastic state when discharged on to the straightening machine in a direction substantially parallel to the rolls. They are caused by the first two rolls to rotate about their own axes and then progress from roll to roll, in the course of which they are straightened as they cool.
  • the disadvantages referred to above are, at least to a material extent, overcome by the apparatus of the instant invention which provides that some at least of the rolls, and preferably the final rolls, are profiled to permit the passage of cooling air upwards between adjacent rolls thereby promoting cooling of the tubes and of the rolls.
  • This profile may be provided by indentations on the rolls so that the tubes are supported on set-out portions of the profile during straightening whilst at the same time cooling air can be blown upwards between the rolls through the passages provided by the indentations.
  • the set-out portions of the profiled rolls should preferably be staggered from roll to roll so that the profiles of adjacent rolls can mate.
  • the profiles can be provided by axially spaced annular ribs on the rolls or by helical ribs.
  • the advantage of the latter is that the points of contact of the hot tubes with the helical ribs vary constantly as the tubes and the rolls rotate and marking of the tubes is avoided.
  • FIG. 1 is a diagrammatic end elevation of a straightening machine embodying the present invention
  • FIG. 2 is a diagrammatic plan showing part of the straightening machine seen in FIG. 1;
  • FIG. 3 is an enlarged cross-section of cooling rolls conforming to the invention.
  • FIGS. 4 and 5 are diagrammatic representations of alternative shapes for these rolls.
  • the roll-type straightening machine shown in FIGS. 1 and 2 incorporates a number of hollow parallel rolls set as close together as possible with their axes in one horizontal plane.
  • Each roll is supported in the conventional manner by suitable mid-supports, such as 1, and each of its ends rotates in bearings, one of which forms part of a driving assembly 2, enclosing gears by which uniform rotary motion in one and the same direction can be imparted to all the rolls, the power being provided by a motor 3.
  • the hollow rolls are cooled internally by water circulation from a header, 4.
  • the running of the machine can be operated and supervised from the desk 5.
  • At least the last two rolls of the straightening machine are given an indented profile, so that the machine comprises one set of rolls, 6a, 6b 6n, the prime function of which is to straighten the tubes, incidentally cooling them, followed by a second set of rolls, 7a, 7b 7m, the prime function of which is to afford intensive cooling of the tubes while completing the straightening process.
  • the rolls 6 are plain cylinders, arranged as in conventional straightening machines.
  • the rolls 7 have an indented profile such that the set-out portions support the tubes and cause them to rotate about their own axes while straightening them, while the set-in portions permit the passage of cooling air circulated by means of an air duct 8, situated below the level of the rolls, from a suitable blower 9.
  • the set-out portions should preferably be staggered from roll to roll, to enable the profiles of adjacent rolls to mate or interlock.
  • These setout portions may be formed from separate rings or annular ribs fixed or disposed at regular intervals along a core consisting of a plain hollow cylinder, 10.
  • the portions in relief are formed from axially short rings or ribs, 11, fixed to the core 10 and spaced longitudinally apart effectively leaving grooves between the ribs.
  • the rings on one roll are offset longitudinally with respect to those on the adjacent roll to enable the rolls that support the tubes for straightening by the rings to be brought as closely together as possible, while still leaving sufficient space between the cores 10 to enable the cooling air to pass through.
  • the indented profile of the roll is obtained by the provision of axially short rings or ribs 12, spaced longitudinally but closer than the rings or ribs 11 of the previous example.
  • the profiles of adjacent rolls interlock and the advantage of this arrangement is that it provides better support for the tubes that are being straightened, without the rolls having to be fitted so closely together. 7
  • the indented profile is obtained with the aid of rings or ribs 13, disposed substantially in the same way as in FIG. 4, but axially longer than those of the previous example, so that the number of rings can be reduced while ensuring proper support for the tubes and still leaving an adequate gap for the passage of cooling air.
  • the set-out portions may take the form of helical ribs, disposed in such a way that the profiles of adjacent rolls interlock as they rotate.
  • the helical pitch should preferably be the same on each roll.
  • FIG. 3 shows one plain roll, 6n, followed by rolls with indented profiles, 7a, 71) etc.
  • the tubes T progress over the rolls of the straightening machine in the direction of the arrow F, rotating about their own axes by reason of the rotation of the various rolls.
  • the tubes T, already straightened and partially cooled by the set of rolls 6, come to rest, parallel to the rolls, initially between the plain roll 6n and the set-out portion11, for exampleof the roll 7a and then between the set-out portions of the rolls 7a and 7b.
  • the various rolls are cooled internally bywater circulation, but, in addition, air is blown upwards through the spaces available between the cores 10 of the interlocked rolls. This air eflectively cools the tubes T as they rotate about their own axes.
  • the peripheral speed of the rolls can be increased in succession from start to finish throughout the machine, so that, because of the differences in relative tangential speed between successive rolls, the tubes tend to move out of the space situated between these.
  • the variation in tangential speed can be obtained by varying the angular velocity of rolls of equal diameter, by varying the 4 a diameter of rolls having equal angular velocity or by a combination of these two possibilities.
  • the grooves need not necessarily extend completely around a roll.
  • the grooves could extend only partly around a roll, the grooves being staggered circumferentially and adjacent grooves overlapping circumferentially so that in all angular positions of the roll there is a plurality of grooves extending through the bite between adjacent rolls to allow the passage of cooling air therethrough to the tubes supported above.
  • Apparatus for straightening and cooling hot-rolled tubes comprising a series of hollow rolls with their axes substantially horizontal, means for circulating cooling water through said hollow rolls, means for feeding hotrolled tubes in plastic to semi-plastic condition to the first roll of said series of hollow rolls with the axes of said hot-rolled tubes parallel to said hollow rolls, said series of hollow rolls being set closely together side by side at a distance of less than the diameter of said hot-rolled tubes, means for rotating said rolls in the same direction whereby said hot-rolled tubes fed to the first roll of said series of hollow rolls are advanced over said series of hollow rolls, the first rolls of said series of hollow rolls considered in the direction of advance of said hot-rolled tubes being rolls having a plane surface while the remaining rolls of said series of hollow rolls being provided with grooves arranged and disposed so that at all angular positions of adjacent rolls a plurality of grooves extend through the bite of adjacent rolls, and means for blowing cooling air through said grooves extending through the bite of adjacent rolls, whereby said hot-rolled tubes in plastic to semi-plastic condition are

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
US651843A 1966-07-11 1967-07-07 Apparatus for straightening hot-rolled tubes Expired - Lifetime US3534575A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR68933A FR1493058A (fr) 1966-07-11 1966-07-11 Perfectionnements aux installations de dressage des tubes, après calibrage à chaud

Publications (1)

Publication Number Publication Date
US3534575A true US3534575A (en) 1970-10-20

Family

ID=8612949

Family Applications (1)

Application Number Title Priority Date Filing Date
US651843A Expired - Lifetime US3534575A (en) 1966-07-11 1967-07-07 Apparatus for straightening hot-rolled tubes

Country Status (7)

Country Link
US (1) US3534575A (de)
AT (1) AT290254B (de)
DE (1) DE1627532A1 (de)
ES (1) ES342725A1 (de)
FR (1) FR1493058A (de)
GB (1) GB1174950A (de)
NL (1) NL6709609A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985002796A1 (en) * 1983-12-20 1985-07-04 Tubemakers Of Australia Pty. Limited Roller cooling table
JPS61500778A (ja) * 1983-12-20 1986-04-24 チユ−ブメ−カ−ズ・オブ・オ−ストラリア・ピ−テイ−ワイ・リミテツド ロ−ラ冷却テ−ブル
CN104209351A (zh) * 2014-08-27 2014-12-17 鞍钢集团工程技术有限公司 具有矫直功能的铰笼式圆盘钢管冷床
CN107913908A (zh) * 2017-11-13 2018-04-17 天津鹏通金属结构制造有限公司 一种高强度轻型断面钢格板加工工艺

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US265265A (en) * 1882-10-03 Or shafting
AT87351B (de) * 1917-03-30 1922-02-25 Heinrich Stueting Vorrichtung zum Abkühlen warmer Rohre.
US1675949A (en) * 1925-10-22 1928-07-03 Central Nat Bank Of Cleveland Hotbed
US1750534A (en) * 1928-03-21 1930-03-11 American Sheet & Tin Plate Sheet-making apparatus
US1758699A (en) * 1928-12-08 1930-05-13 Benjamin P Hazeltine Straightening machine
US2199130A (en) * 1938-09-26 1940-04-30 Benjamin P Hazeltine Straightening machine
US2542940A (en) * 1946-07-19 1951-02-20 Ford Motor Co Spring manufacture
US2895190A (en) * 1955-09-12 1959-07-21 Mannesmann Ag Continuous casting plants
GB1026941A (en) * 1963-01-30 1966-04-20 Siemag Siegener Masch Bau Method and means for the reeling of rolled material
US3390871A (en) * 1962-08-24 1968-07-02 Morgan Construction Co Apparatus for the controlled cooling of rods
US3452785A (en) * 1965-12-07 1969-07-01 David William Mclean Apparatus for depositing and conveying rod rings in sequence with rod forming means

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US265265A (en) * 1882-10-03 Or shafting
AT87351B (de) * 1917-03-30 1922-02-25 Heinrich Stueting Vorrichtung zum Abkühlen warmer Rohre.
US1675949A (en) * 1925-10-22 1928-07-03 Central Nat Bank Of Cleveland Hotbed
US1750534A (en) * 1928-03-21 1930-03-11 American Sheet & Tin Plate Sheet-making apparatus
US1758699A (en) * 1928-12-08 1930-05-13 Benjamin P Hazeltine Straightening machine
US2199130A (en) * 1938-09-26 1940-04-30 Benjamin P Hazeltine Straightening machine
US2542940A (en) * 1946-07-19 1951-02-20 Ford Motor Co Spring manufacture
US2895190A (en) * 1955-09-12 1959-07-21 Mannesmann Ag Continuous casting plants
US3390871A (en) * 1962-08-24 1968-07-02 Morgan Construction Co Apparatus for the controlled cooling of rods
GB1026941A (en) * 1963-01-30 1966-04-20 Siemag Siegener Masch Bau Method and means for the reeling of rolled material
US3452785A (en) * 1965-12-07 1969-07-01 David William Mclean Apparatus for depositing and conveying rod rings in sequence with rod forming means

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985002796A1 (en) * 1983-12-20 1985-07-04 Tubemakers Of Australia Pty. Limited Roller cooling table
JPS61500778A (ja) * 1983-12-20 1986-04-24 チユ−ブメ−カ−ズ・オブ・オ−ストラリア・ピ−テイ−ワイ・リミテツド ロ−ラ冷却テ−ブル
US4747290A (en) * 1983-12-20 1988-05-31 Tubemakers Of Australia Pty., Ltd. Roller cooling table
CN104209351A (zh) * 2014-08-27 2014-12-17 鞍钢集团工程技术有限公司 具有矫直功能的铰笼式圆盘钢管冷床
CN104209351B (zh) * 2014-08-27 2016-05-25 鞍钢集团工程技术有限公司 具有矫直功能的铰笼式圆盘钢管冷床
CN107913908A (zh) * 2017-11-13 2018-04-17 天津鹏通金属结构制造有限公司 一种高强度轻型断面钢格板加工工艺

Also Published As

Publication number Publication date
NL6709609A (de) 1968-01-12
FR1493058A (fr) 1967-08-25
DE1627532A1 (de) 1971-08-12
ES342725A1 (es) 1968-08-01
AT290254B (de) 1971-05-25
GB1174950A (en) 1969-12-17

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