US3901059A - Shape-rolling mill for working metallic section material - Google Patents

Shape-rolling mill for working metallic section material Download PDF

Info

Publication number
US3901059A
US3901059A US512407A US51240774A US3901059A US 3901059 A US3901059 A US 3901059A US 512407 A US512407 A US 512407A US 51240774 A US51240774 A US 51240774A US 3901059 A US3901059 A US 3901059A
Authority
US
United States
Prior art keywords
fluid pressure
mill
roll
rigidity
shape
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.)
Expired - Lifetime
Application number
US512407A
Other languages
English (en)
Inventor
Koe Nakajima
Kazuo Watanabe
Shyuichi Hamauzu
Hideki Tokita
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.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
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 Nippon Steel Corp filed Critical Nippon Steel Corp
Application granted granted Critical
Publication of US3901059A publication Critical patent/US3901059A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/16—Adjusting or positioning rolls
    • B21B31/18—Adjusting or positioning rolls by moving rolls axially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/58—Roll-force control; Roll-gap control
    • B21B37/64—Mill spring or roll spring compensation systems, e.g. control of prestressed mill stands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
    • B21B1/09—L-sections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2273/00—Path parameters
    • B21B2273/22—Aligning on rolling axis, e.g. of roll calibers

Definitions

  • ABSTRACT A shape-rolling mill for working metallic section material, which is capable of correcting mill rigidity in a transverse direction parallel to the axes of work rolls by means of a fluid pressure mechanism.
  • the sectional roll-pass configuration is corrected by adjusting the rigidity in the axial direction of the rolls in relation to the rigidity in the vertical or reducing direction under control of the fluid'mechanism.
  • a second fluid pressure mechanism is provided for correcting the mill rigidity in the reducing direction.
  • the second fluid mechanism controls the vertical rigidity of the mill to allow a greater freedom to the adjustment of the ratio between the longitudinal and transverse rigidities of the mill.
  • the sectional shape of the metallic work is corrected by balancing the vertical and transverse mill rigidities.
  • This invention relates to a rolling mill for shaperolling elongated structural metal material or section material such as angle steel with web and flange portions different in length and thickness. More particularly, the invention relates to a rolling mill which has means for correcting deformations which occur to the roll-pass contour which is defined by at least two working rolls due to elongation and contraction of the rolling mill per se and the working rolls in diversified directions.
  • Cross-sectional configurations of metallic section material are not simply rectangular nor of uniform width as with ordinary plates but are diversified in width and thickness.
  • the metal material between the working rolls is displaced in the direction of rolling (the direction in which the stock is transferred) as well as in the direction of reduction (the direction perpendicular to the work surface which is in contact with the rolls) and in the transverse direction (the direction parallel to the roll axes).
  • a roll pass contour is defined by a number of rolls.
  • the displacement of the metal material in the direction of roll axis is varied depending upon the particular shape of the roll pass and the rolling load which is imposed in the vertical direction (the direction of reduction).
  • the rolling mill has insufficient rigidity in the direction of reduction (vertical direction) and the opposing rolls are vertically bent away from each other in the middle portions thereof due to rolling loads (rolling reactions), causing variations in the roll clearance width.
  • the roll clearances in different portions of the roll pass undergo variations in different degrees and contribute to deform the metal work which is passed through the rolls. This is ultimately reflected by dimensional errors or deviations and irregular variations in shape of the final products and sometimes by bending of the rolled metal material.
  • the above-mentioned objects of the present invention can be attained by providing means for adjusting the rolling mill rigidity in the axial direction of the rolls in a shape-rolling mill such as two-roll, three-roll, fourroll universal rolling mill or the like.
  • the correction of the roll-pass contour that is to say, the correction of the rolling crosssectional shape is effected by a rolling mill rigidity adjusting means which is adapted to adjust the mill rigidity in the axial direction of the rolls.
  • the rigidity of the rolling mill in the vertical or reducing direction is normally fixed.
  • the deviations in the axial direction of the rolls or the roll pass contours show different behaviors when the rolling mill rigidity in the axial direction of the rolls is changed.
  • the roll-pass contours which dictate the cross-sectional shape of the rolling material can be corrected and maintained in optimum shapes by a roll mill rigidity adjusting means which is adapted to balance the rolling mill rigidity in the axial direction with the fixed rigidity in the vertical or reducing direction.
  • the rolling mill further includes a second mill rigidity adjusting means which is adapted to adjust the mill rigidity in the vertical or work reducing direction.
  • the rolling mill has a variable rigidity also in the vertical direction, so that the control] of the roll-pass contours affords a greater degree of freedom to ensure exactly the desired cross-sectional rolling shape.
  • FIG. 1 is a diagrammatic view of a rolling mill employing the present invention with mill rigidity control means shown in block diagram;
  • FIGS. 2a to 21 are diagrammatic views showing progressive reductions of a metal work which is rolled through a number of passes or roll stands;
  • FIG. 3 is a diagrammatic sectional view of rolls which are employed in angle steel shape rolling
  • FIG. 4 is a diagrammatic view of a roll-pass contour where correct contour is indicated by a solid line while contour deviations are indicated by a broken line;
  • FIG. 5 is a graphic illustration employed to explain the procedures for calculating the dimensional deviations at the appex B of the roll-pass contour shown in FIG. 4;
  • FIG. 6 is a block diagram of a shape rolling mill employing a plural number of roll stands
  • FIG. 7 is a graphical illustration employed to calculate roll displacements AX and AY in relation with a rigidity ratio of K Kx/K Y
  • FIG. 8 is a graphic illustration showing the value of the bend assessment coefficient CA in relation to a rigidity ratio of K Kx/K Y PARTICULAR DESCRIPTION OF THE INVENTION
  • FIG. 1 which shows one preferred form of a shape-rolling mill according to the present invention
  • the rolling mill is designed to roll angle steel with side walls varying in length and thickness.
  • the upper and lower working rolls 1 and 2 each with a predetermined surface configuration are supported on bearing boxes or chocks 4 within a housing 3.
  • the lower roll 2 is further supported on a fluid pressure mechanism 5 which is adapted to move the lower roll 2 up and down to adjust the rigidity in the vertical or work reducing direction.
  • a separate fluid pressure mechanism is provided to act on the outer sides of the bearing boxes 4 as shown at 6 for adjusting the rolling mill rigidity in the direction of the roll axes.
  • This fluid pressure mechanism applies a fluid pressure on the upper and lower rolls 1 and 2 in a direction parallel to the roll axes through the respective chocks or bearing boxes 4.
  • the pressures of the first and second fluid pressure mechanisms 5 and 6 are controlled by a fluid pressure control unit which is supplied with a fluid pressure from a fluid pressure generator 9.
  • the gauges in various portions of the rolling section material which comes out of a roll stand are checked by a detector 7 and the detected signals are supplied to an operating unit 8.
  • the operating unit 8 compares the detected signals with fixed reference signals which indicate a predetermined roll-pass contour (cross-sectional shape and dimension) to produce output signals indicating corrective dimensional deviations.
  • the fluid pressure generator 9 produces a corrective fluid pressure in accordance with the deviation signals from the operating unit 8, the corrective fluid pressure being transmitted to either the first or second fluid pressure mechanism 5 or 6 by the fluid pressure control unit 10 which operates in response to the deviation signals.
  • the metal work is gradually transformed while being passed through a number of passes or roll stands, as shown, for example, in FIGS. 2a to 21. More particularly, a metal work which has a rectangular cross-section as in FIG. 2a is rolled into the shape of FIG. 2b by the first pass or roll stand and then into the shape of FIG. 2c by the second pass or roll stand. In the similar manner, the metal work is transformed by the succeeding passes or roll stands and finally imparted with the shape of FIG. 2! by the last pass or roll stand.
  • the roll-pass contours of the respective passes or roll stands have configurations corresponding to themetal work shapes shown in FIGS. 2a to 2l. For example, a metal work which has been rolled to the shape of FIG. 2k is transformed into the shape of FIG. 21 by the final pass or roll stand which has a rollpass contour as shown particularly in FIG. 3.
  • FIG. 3 shows a sectional rollpass contour of the rolls which transforms the metal work of FIG. 2k into the shape of FIG. 21.
  • the metal work is rolled in the clearance or roll-pass 13 between the upper and lower rolls 1 and 2.
  • the upper and lower rolls 1 and 2 are formed integrally with the shafts l1 and 12, respectively, so that, by rotation of the shafts I1 and 12, the metal work is passed through the contoured roll clearance 13 and imparted with the shape of FIG. 21.
  • the surface configurations of the rolls 1 and 2 as well as the positions of the shafts 1 1 and 12 are determined prior to the rolling operation such that the roll pass 13 has a predetermined cross-sectional shape.
  • the roll-pass contour is deformed in various portions depending upon the roll stand rigidity in the vertical and transverse directions.
  • the roll stand is usually set in position in consideration of presumable contour deformations in the roll pass 13 and the metal work is rolled into the intended final shape of FIG. 21 in the initial stage of the rolling operation.
  • complicated deformations occur in the rollpass contour 13 due to thermal deformations of the metal work, rolls, stand housing and so forth or due to positional deviations of the upper and roller rolls in vertical and transverse directions which are usually caused by abrasive wear of the work-abutting surfaces or thrust collars l4 and 15 of the upper and lower rollers 1 and 2.
  • FIG. 4 shows on an enlarged scale the roll pass 13 which is defined by the upper and lower rolls 1 and 2.
  • the deformation of the roll-pass contour is caused by relative displacement of the upper and lower rolls 1 and 2 in the vertical direction (direction of axis Y Y) and in the direction parallel to the roll axes (direction of axis X X).
  • the solid line indicates the correct contour of the roll pass 13 and the broken line indicates the deformation which occurs in the course of the rolling operation.
  • the initial contour of the roll pass 13 has two angularly disposed web and flange portions of h and hp in width, which, however, are widened or narrowed to h and h in the course of the rolling Operation.
  • the appex angle y is also changed to 'y'.
  • the positional deviation of the appex B (to the position B) can be expressed as in FIG. 5 where AY represents the relative vertical displacement of the upper and lower rolls 1 and 2 (or roll gap displacement) and AX represents the relative transverse displacement (in the direction parallel to the roll axes or the direction of axis X X).
  • the thickness of the web on the lefthand in FIG. 5 is expressed from geometrical relations as Ah h h AX sina
  • the vertical and transverse roll gap deviations AX and AY are expressed as Ah sina Ah,.- sinB Alw AX sinfi AY sina
  • the deviation All? of the flange length BC can be expressed as AIF AX sina AY sinB
  • the thickness deviations Ahw and MP are obtained by comparing the dimensions h' and h' as measured on the outlet side of the roll stand with the set reference values h and hp, and then the vertical and transverse roll gap deviations AY and AX can be obtained from equations (3) and (4).
  • the web and flange length deviations Al and A)? are obtained from equations (3) and (4) (these deviations can also be obtained by actual measurements).
  • the detector 7 detects the gauges (h h of various portions of the metal work on the downstream side of the rolling stand for comparison with predetermined reference values (h hp) in the operating unit 8. As a result of this comparison, the vertical and transverse roll gap deviations AX and AY are computed out.
  • the operating unit 8 produces output signals indicative of the roll gap deviations AX and AY for transmission to the fluid pressure generator 9 and to the fluid pressure control unit 10 for operating the first fluid pressure mechanism 5 and/or the second fluid pressure mechanism 6 in a manner to zeroize the deviations AX and AY.
  • FIG. 6 shows in a block diagram an example of a multi-stand shape-rolling mill employing the present invention in certain roll stands.
  • the rolling mill includes a number of roll stands as indicated at 15 to 22 through which the metal section material is transferred in series.
  • the hatched stands 15, 18 and 19 are provided with the rigidity adjusting means according to the invention.
  • the reference numeral 7 indicates a dimension detector.
  • the upstream roll stands 20 to 22 the metal work is rolled roughly under relatively great rolling load and does not require accurate control of its crosssectional shape.
  • the roll stands according to the invention can be more effectively used on the downstream side of the multi-stand rolling mill.
  • the detector 7 may be located on an outlet side of each roll stand but may be provided at one side of a particular roll stand which is located downstream of a number of similar roll stands as shown in FIG. 6, using the output signals of the detector 7 also for the control of the upstream roll stands. Alternatively, output signals of a single detector may be used for the control of a multiple number of roll stands.
  • the force necessary for stretching or contracting the rolling mill by a unit length is expressed by K, the vertical rigidity by K the transverse rigidity by K and the rolling load by P.
  • the load in the reducing direction is p
  • the roll gap in the reducing direction is Sy
  • the load in the direction parallel to the roll axes (or thrusting direction) is P
  • the roll gap in the direction parallel to the roll axes is S
  • the thickness h 1 of the rolling material in the direction parallel to the roll axes is expressed as h S (P /K Therefore,
  • K X is the mill rigidity in the transverse direction parallel to the roll axes and Ky is the mill rigidity in the vertical (reducing) direction.
  • the metal work can be rolled into a correct cross-sectional shape by controlling the fluid pressures in the first and second fluid pressure mechanisms 5 and 6 in terms of the values K and K
  • a load detector which is adapted to detect the vertical load Py Pwy P and another detector which is adapted to detect transverse load P FPWX in the mill of FIG.
  • the values K and K are obtained directly from the equations (6') and (7) since Pwy Ppy and P P are given by actual measurements. In this instance, therefore, there is no necessity of solving the simultaneous equations (10) to (13).
  • the loads Py and P are indicated by the output signals of a fluid pressure detector which is operatively connected to the first and second fluid pressure mechanisms 5 and 6, and the output signals of the fluid pres sure detector are fed to the operating unit 8, which, on the other hand, is supplied from the detector 7 with signals indicative of the amounts of deviations AX and AY. Based on the received signals, the operating unit 8 calculates and outputs the values of K X and Ky for effecting the necessary correction of shape deformation in accordance therewith.
  • the shape-rolling mill according to the present invention has thus far been discussed in connection with the control of the cross-sectional shape of the rolling section material. However, it can also control bends in the rolling material as will be described hereafter.
  • the variations in thickness causes differences in elongation percentages between different portions of the cross-sectional area of the metal work. These differences in elongation percentage in turn cause bends to the metal work. If, in the deformed roll pass 13 of FIG. 4, the web AB of the metal work undergoes elongation AW while the flange BC undergoes elongation AF, there is established the relation On the other hand, if the web and flange elongations in the roll pass 13 with a correct contour are W0 and F0, there is established the relation From equations l0) and l l a bend assessment coefficient CA is obtained as FIG.
  • FIG. 7 shows the relative roll displacements AX and AY in the vertical and transverse directions in relation with variations in the vertical rigidity Ky and the transverse rigidity 'K or variations in the rigidity ratio of K Kx/Ky.
  • the graph of FIG 8 shows plots of the bend assessment coefficient CA based on the data of FIG. 7.
  • the shape-rolling mill of the invention as illustrated in FIG. 1 can also be applied for the control of the bends in the metal work.
  • the vertical rolling mill rigidity Ky is controlled by the first fluid pressure mechanism while the transverse rigidity is controlled by the second fluid pressure mechanism 6, so that bends in the work can be easily corrected by adjusting the rigidity ratio of Kx/Ky.
  • a shape-rolling mill for metallic section material wherein a metal work is rolled into a predetermined cross-sectional shape through a contoured roll pass which is defined between a number of opposingly disposed rolls, said mill comprising a first fluid pressure mechanism for adjusting the mill rigidity in the transverse direction parallel to the roll axes, and pressure control means for controlling the fluid pressure in said first fluid pressure mechanism for maintaining said transverse rigidity in a suitable ratio with respect to the vertical rigidity of the mill.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Metal Rolling (AREA)
US512407A 1973-10-08 1974-10-07 Shape-rolling mill for working metallic section material Expired - Lifetime US3901059A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11362873A JPS5311950B2 (enrdf_load_stackoverflow) 1973-10-08 1973-10-08

Publications (1)

Publication Number Publication Date
US3901059A true US3901059A (en) 1975-08-26

Family

ID=14617029

Family Applications (1)

Application Number Title Priority Date Filing Date
US512407A Expired - Lifetime US3901059A (en) 1973-10-08 1974-10-07 Shape-rolling mill for working metallic section material

Country Status (5)

Country Link
US (1) US3901059A (enrdf_load_stackoverflow)
JP (1) JPS5311950B2 (enrdf_load_stackoverflow)
DE (1) DE2447823A1 (enrdf_load_stackoverflow)
FR (1) FR2246320B1 (enrdf_load_stackoverflow)
GB (1) GB1488392A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2828151A1 (de) * 1978-06-21 1980-01-10 Nippon Steel Corp Vorrichtung zur steuerung der lage einer walze in ihrer axialen richtung beim walzen eines materials
US4283930A (en) * 1977-12-28 1981-08-18 Aichi Steel Works Limited Roller-dies-processing method and apparatus
US4344310A (en) * 1979-08-03 1982-08-17 Nippon Steel Corporation Method of rolling railroad-rails and steels of similar shape by universal rolling
EP1234621A1 (de) * 2001-02-27 2002-08-28 SMS Demag AG Verfahren und Verschiebewalze zum Walzen von profiliertem Walzgut

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2815777A1 (de) * 1977-04-28 1978-11-02 Stiftelsen Metallurg Forsk Walzwerk
US4203310A (en) * 1978-12-28 1980-05-20 Krylov Nikolai I Mill stand roll assembly

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3650135A (en) * 1968-06-14 1972-03-21 British Iron Steel Research Control for rolling means having successine rolling stands

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3650135A (en) * 1968-06-14 1972-03-21 British Iron Steel Research Control for rolling means having successine rolling stands

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4283930A (en) * 1977-12-28 1981-08-18 Aichi Steel Works Limited Roller-dies-processing method and apparatus
DE2828151A1 (de) * 1978-06-21 1980-01-10 Nippon Steel Corp Vorrichtung zur steuerung der lage einer walze in ihrer axialen richtung beim walzen eines materials
US4202192A (en) * 1978-06-21 1980-05-13 Nippon Steel Corporation Apparatus for controlling the position of roll in the direction of the roll axis
US4344310A (en) * 1979-08-03 1982-08-17 Nippon Steel Corporation Method of rolling railroad-rails and steels of similar shape by universal rolling
EP1234621A1 (de) * 2001-02-27 2002-08-28 SMS Demag AG Verfahren und Verschiebewalze zum Walzen von profiliertem Walzgut
US6672119B2 (en) * 2001-02-27 2004-01-06 Sms Demag Aktiengesellschaft Axial-position adjustment for profiled rolling-mill rolls

Also Published As

Publication number Publication date
FR2246320B1 (enrdf_load_stackoverflow) 1977-10-28
JPS5062850A (enrdf_load_stackoverflow) 1975-05-29
GB1488392A (en) 1977-10-12
DE2447823A1 (de) 1975-08-21
FR2246320A1 (enrdf_load_stackoverflow) 1975-05-02
JPS5311950B2 (enrdf_load_stackoverflow) 1978-04-25

Similar Documents

Publication Publication Date Title
US12121946B2 (en) Rolling mill and rolling mill adjustment method
US4898012A (en) Roll bite gauge and profile measurement system for rolling mills
EP0743107A1 (en) Improvements in or relating to a roll crossing and shifting system
EP0621087B1 (en) Rolling mill and method
US5231858A (en) Method of controlling edge drop in cold rolling of steel
US3901059A (en) Shape-rolling mill for working metallic section material
US3714805A (en) Control system and method for concurrent automatic gage and crown control of a rolling mill
US4344310A (en) Method of rolling railroad-rails and steels of similar shape by universal rolling
US3599459A (en) Shape of sheet material
US3394566A (en) Correction of roll positioning in a rolling mill
EP0875303B1 (de) Verfahren zum Betreiben eines Walzwerks für das Warm- und Kaltwalzen von Flachprodukten
EP0087083B1 (en) Gauge control method and apparatus for multi-roll rolling mill
JP3458731B2 (ja) 冷間タンデム圧延機における形状制御方法および形状制御装置
US3592030A (en) Rolling mill stand screwdown position control
JPH0813367B2 (ja) 板圧延機
JP6743835B2 (ja) 形鋼の圧延方法及び形鋼の圧延におけるレベリング量の調整方法
JP4267609B2 (ja) 金属板材の圧延方法および圧延装置
EP0075961B1 (en) Control device for a continuous rolling machine
JP7127446B2 (ja) 圧延機の設定方法
EP3914402B1 (en) Rolling equipment and rolling method
JP7743845B2 (ja) 形材の圧延方法及び圧延設備
JPH0698366B2 (ja) 板材の形状制御方法
JP2993414B2 (ja) 熱間圧延における板プロフィル制御方法
US12330198B2 (en) Rolling mills and rolling methods
SU1100021A1 (ru) Устройство дл измерени толщины проката