US3217520A - Blooming mill reversal - Google Patents

Blooming mill reversal Download PDF

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Publication number
US3217520A
US3217520A US217957A US21795762A US3217520A US 3217520 A US3217520 A US 3217520A US 217957 A US217957 A US 217957A US 21795762 A US21795762 A US 21795762A US 3217520 A US3217520 A US 3217520A
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United States
Prior art keywords
motor
rolls
main
circuit
bloom
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
US217957A
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English (en)
Inventor
Wilden Adrian
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.)
SCHVEIZERISCHE ALUMINIUM AG
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SCHVEIZERISCHE ALUMINIUM AG
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.)
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Publication date
Application filed by SCHVEIZERISCHE ALUMINIUM AG filed Critical SCHVEIZERISCHE ALUMINIUM AG
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Publication of US3217520A publication Critical patent/US3217520A/en
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Expired - Lifetime legal-status Critical Current

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    • 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
    • B21B37/46—Roll speed or drive motor control
    • 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
    • B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
    • B21B1/06—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing in a non-continuous process, e.g. triplet mill, reversing mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B33/00—Safety devices not otherwise provided for; Breaker blocks; Devices for freeing jammed rolls for handling cobbles; Overload safety devices

Definitions

  • the rolls of rolling mills usually are driven by electric motors. If there occurs a failure in the power supply during rolling, the ingot between the immobilized rolls will cause each roll to be excessively heated on one side, which may lead to roll fracture unless the ingot is released rapidly. A stoppage of about two to three minutes might be absorbed without damage to the rolls, but any longer stoppage, for instance of five minutes, may easily lead to fracture of the rolls, owing to the excessive heat supplied to the rolls on one side by the bloom. The resulting loss includes not only the expensive rollers but also loss of production.
  • the invention consists in the novel methods, construction, arrangement and combination of various devices, elements and parts, as set forth in the claims hereof, one embodiment of the same being illustrated in the accompanying drawing and described in the specification.
  • the instant invention provides for the switching over of the electrically driven motor from the failing current supply to a storage battery, for driving the rolls in the reverse direction for bloom discharge. As this operation is but brief, the rolls are not subject to overheating.
  • the motor 11 forms part of a first or main electric circuit 12 which includes first or main switch means such as first switches 13, and which connects the motor 11 to a power supply such as a main current supply, for instance a three-phase line 14.
  • the main circuit '12 may include a current transformer 16, rectifying means such as rectifiers l7 and chokes or throttles 18.
  • a second or auxiliary circuit 19 is provided which is also connected to the motor 11 and includes a direct current storage battery 21.
  • the connection of the auxiliary circuit 19 to the motor 11 is such, however, that, upon completion of the auxiliary circuit 19, the motor 11 will be driven from the battery 21 in the opposite or reverse direction B.
  • the storage battery 21 is always kept ready, for instance by means of an automatic charging device (not shown) which keeps the battery 21 at full voltage, and on discharge of the battery re-charges the battery 21 to full voltage.
  • the main switches 13 When there is failure in the current supplied by the main circuit 12, for instance due to current failure in the line 14, the main switches 13 will open up automatically, thereby disconnecting the motor 11 from the main current supply, enabling the motor 11 to be connected to the battery 21 to be driven thereby in reverse direction.
  • a transformer 22 is provided in circuit with an actuator, such as a relay 23.
  • the relay 23 forms part of a second or auxiliary switch means 24 for the auxiliary circuit 19.
  • the auxiliary switch means 24 include the aforesaid relay 23, a relay rod 31 and switches 26.
  • the main switches 13 are mounted on the same relay rod 31 of the auxiliary switch means 24 as the switches at; therefore when the switches 26 are being closed by the rod 311, the main switches 13 will at the same time be opened and, conversely, when the rod 31 opens the switches 26 it will simultaneously close the main switches 13, automatically.
  • switches 13 of the main circuit 12 are normally closed and open only when there is a current failure
  • the switches 26 of the auxiliary circuit 19 are normally open and close only during the aforesaid current failure in the main circuit 12.
  • the battery 21 it is also possible for the battery 21 to be switched in by manual operation at the control panel of the mill, by suitable well-known manual switching means (not shown).
  • the maximum current required to turn the rolls back when an ingot is jammed has been established by tests to be 1300 amperes if the basic speed of the driving motor is 43 r.p.m.; 5 revolutions of the motor are enough to release the ingot even in the most unfavorable case.
  • This current of 1300 amperes is required only on starting up. As the rolls turn back the current required falls by one half.
  • the line 14 may have 380 volts and 50 cycles.
  • a suitable battery for use in the invention is a nickel cadmium steel battery having a voltage of 96 volts and a capacity of 284 ampere-hours on a one-half hour discharge.
  • This battery can deliver a current surge of 1,600 amperes for 1 minute, the voltage dropping to about 60 volts; thereafter, it can still be discharged for about 12 minutes at 800 amperes and about 80 volts.
  • a main electric circuit operable for removably connecting said motor .to a main electric current supply to drive the motor in one direction for driving said rolls in the rolling direction for bloom rolling, an auxiliary source of energy, an auxiliary circuit comprising said auxiliary source, and switch means operable upon the occurrence of a failure in said main circuit for interconnecting said motor in said auxiliary circuit thereby completing said auxiliary circuit, said auxiliary circuit being so arranged that upon its completion the motor will be oppositely driven to drive the rolls in the reverse direction for bloom removal.
  • a blooming mill the combination of a pair of rolls, an electric motor operable for rotating said rolls, a main electric circuit comprising first switch means operable for removably connecting said motor to a main electric current supply for driving said rolls for bloom rolling, an auxiliary source of energy, an auxiliary circuit comprising said auxiliary source and second switch means operable automatically upon the occurrence of a failure in said main circuit for connecting said motor in said auxiliary circuit thereby completing said auxiliary circuit, said auxiliary circuit being so arranged that upon its completion the motor will drive the rolls for bloom removal.
  • said first switch means being so arranged that they are self-opened upon the failure of current in said main circuit, said auxiliary source being independent from said main current supply, said second switch means automatically operating and completing the auxiliary circuit upon the failure of the current in the main circuit.
  • said motor being a direct current motor
  • said main circuit including rectifying means for feeding rectified current from said main current supply to said electric motor
  • said auxiliary supply being a direct current storage battery

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
US217957A 1961-08-22 1962-08-20 Blooming mill reversal Expired - Lifetime US3217520A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH982761A CH390847A (de) 1961-08-22 1961-08-22 Verfahren und Vorrichtung zum Lösen des Walzbarrens aus dem Walzenspalt eines Blockwalzwerkes

Publications (1)

Publication Number Publication Date
US3217520A true US3217520A (en) 1965-11-16

Family

ID=4356059

Family Applications (1)

Application Number Title Priority Date Filing Date
US217957A Expired - Lifetime US3217520A (en) 1961-08-22 1962-08-20 Blooming mill reversal

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Country Link
US (1) US3217520A (de)
CH (1) CH390847A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUD20090075A1 (it) * 2009-04-16 2010-10-17 Danieli Off Mecc Gabbia di laminazione multifunzionale e relativo procedimento di utilizzo

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1080026A (en) * 1912-02-23 1913-12-02 Westinghouse Electric & Mfg Co Motor-reversing means.
US2847179A (en) * 1955-11-18 1958-08-12 Murray D J Mfg Co Safety device for actuating hydraulic gates
US2875391A (en) * 1956-12-28 1959-02-24 Gen Electric Motor control system
US3040182A (en) * 1958-09-12 1962-06-19 Accumulateurs Fixes Direct current voltage generators supplied by an alternating current power source
US3041465A (en) * 1960-05-31 1962-06-26 Vivian E Ayre Auxiliary power supply
US3090900A (en) * 1960-01-14 1963-05-21 Gen Motors Corp Automatically reversible motor for domestic appliance

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1080026A (en) * 1912-02-23 1913-12-02 Westinghouse Electric & Mfg Co Motor-reversing means.
US2847179A (en) * 1955-11-18 1958-08-12 Murray D J Mfg Co Safety device for actuating hydraulic gates
US2875391A (en) * 1956-12-28 1959-02-24 Gen Electric Motor control system
US3040182A (en) * 1958-09-12 1962-06-19 Accumulateurs Fixes Direct current voltage generators supplied by an alternating current power source
US3090900A (en) * 1960-01-14 1963-05-21 Gen Motors Corp Automatically reversible motor for domestic appliance
US3041465A (en) * 1960-05-31 1962-06-26 Vivian E Ayre Auxiliary power supply

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUD20090075A1 (it) * 2009-04-16 2010-10-17 Danieli Off Mecc Gabbia di laminazione multifunzionale e relativo procedimento di utilizzo
WO2010119081A1 (en) * 2009-04-16 2010-10-21 Danieli & C. Officine Meccaniche Spa Multi-functional rolling stand and relative method of use
CN102413953A (zh) * 2009-04-16 2012-04-11 达涅利机械设备股份公司 多功能轧机座和相关的使用方法
CN102413953B (zh) * 2009-04-16 2014-07-02 达涅利机械设备股份公司 多功能轧机座和相关的使用方法

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Publication number Publication date
CH390847A (de) 1965-04-30

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