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WO2000038868A1 - Cisaille a rotation continue, pour pieces laminees, et procede de cisaillement relatif - Google Patents

Cisaille a rotation continue, pour pieces laminees, et procede de cisaillement relatif Download PDF

Info

Publication number
WO2000038868A1
WO2000038868A1 PCT/IB1999/001990 IB9901990W WO0038868A1 WO 2000038868 A1 WO2000038868 A1 WO 2000038868A1 IB 9901990 W IB9901990 W IB 9901990W WO 0038868 A1 WO0038868 A1 WO 0038868A1
Authority
WO
WIPO (PCT)
Prior art keywords
shearing
velocity
rolled stock
drums
time
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.)
Ceased
Application number
PCT/IB1999/001990
Other languages
English (en)
Inventor
Alfredo Poloni
Giampietro Zamo'
Andrea De Luca
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.)
Danieli and C Officine Meccaniche SpA
Original Assignee
Danieli and C Officine Meccaniche SpA
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 Danieli and C Officine Meccaniche SpA filed Critical Danieli and C Officine Meccaniche SpA
Priority to AU15112/00A priority Critical patent/AU1511200A/en
Publication of WO2000038868A1 publication Critical patent/WO2000038868A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D36/00—Control arrangements specially adapted for machines for shearing or similar cutting, or for sawing, stock which the latter is travelling otherwise than in the direction of the cut
    • B23D36/0008—Control arrangements specially adapted for machines for shearing or similar cutting, or for sawing, stock which the latter is travelling otherwise than in the direction of the cut for machines with only one cutting, sawing, or shearing devices
    • B23D36/0033—Control arrangements specially adapted for machines for shearing or similar cutting, or for sawing, stock which the latter is travelling otherwise than in the direction of the cut for machines with only one cutting, sawing, or shearing devices for obtaining pieces of a predetermined length
    • B23D36/0041—Control arrangements specially adapted for machines for shearing or similar cutting, or for sawing, stock which the latter is travelling otherwise than in the direction of the cut for machines with only one cutting, sawing, or shearing devices for obtaining pieces of a predetermined length the tool moving continuously
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D25/00—Machines or arrangements for shearing stock while the latter is travelling otherwise than in the direction of the cut
    • B23D25/12—Shearing machines with blades on coacting rotating drums

Definitions

  • This invention concerns a continuously rotating shears for shearing to size rolled stock, such as bars, rods or similar, obtained with a hot rolling method.
  • the invention concerns a flying shears, wherein the blade-bearing drums are made to rotate continuously, in opposite directions, so as to shear to size, to the desired length, rolled stock of a thickness or diameter of around 6-10 mm or more, travelling at very high speeds, in the region of 45-50 metres per second and more.
  • the shearing method provides that, in the time interval between one shearing operation and the next, the speed of rotation of the blade-bearing drums is controlled and determined by a processor which, irrespective of the pre-set nominal reference velocity (shearing velocity), manages their pendular oscillation - being taken to mean acceleration and deceleration and/or deceleration and acceleration - so that the blades shear the rolled stock exactly to the desired length.
  • a processor which, irrespective of the pre-set nominal reference velocity (shearing velocity), manages their pendular oscillation - being taken to mean acceleration and deceleration and/or deceleration and acceleration - so that the blades shear the rolled stock exactly to the desired length.
  • the state of the art includes various shears employed in the metallurgical field to shear to size products emerging from the rolling train.
  • These flying shears comprise a counter-positioned pair of counter-rotating drums, on the circumference of each of which there is mounted an equal number of shearing blades, at an equal angular distance from each other.
  • a switching device suitable to convey the rolled stock longitudinally; it is movable on a horizontal plane to take the rolled stock from an inactive position, adjacent to the rotating blades, to a shearing position, between the counter-rotating blades, exactly at the desired moment of shearing.
  • the lateral displacement velocity of the switching devices is correlated to the circumferential position and the speed of rotation of the drums, so that the moment at which the rolled stock passes between the blades coincides with the desired shearing position of the blades.
  • the drums are normally made to rotate continuously at a pre-set constant angular velocity, such that the peripheral or tangential velocity of the shearing blades is greater than the speed of advance of the rolled stock which is to be sheared.
  • the peripheral velocity of the blades is pre-set according to the speed of advance of the rolled stock, the desired length to which the rolled stock is to be sheared and the pitch between the shearing blades.
  • the peripheral velocity of the blades moreover, must be pre-set so that, with a finite number of rotation pitches of the blade-bearing drums, it is possible to obtain a plurality of consecutive cuts of the desired length.
  • BE-A-630.233 describes a flying shears with counter- rotating drums to shear and measure rolled products .
  • This document teaches to regulate the peripheral speed of the blades so that this speed is equal to the speed of advance of the rolled stock around the shearing operation; the document does not teach, however, to regulate the speed of the drums in the interval between two successive shearing operations so that, after a whole number of pitches, the blades are in a position for shearing a pre-set length of the rolled stock.
  • FR-A-2.333.604 describes a shears with counter-rotating drums, wherein there are cam means to displace at least one of the drums from a position distanced from the other drum to a position close to the other drum, wherein the respective shearing elements are in a position of cooperation in order to perform the shearing operation.
  • the present Applicant has designed and embodied this invention to overcome the shortcomings of shears which are known to the state of the art, to improve shearing precision and to obtain further advantages as will be shown hereafter.
  • the purpose of the invention is to achieve a flying shears which will allow to obtain precise shearing operations of the rolled stock which passes through at high velocity, for example emerging from a finishing train.
  • the shears according to the invention provides that the velocity of rotation of the drums and hence the peripheral velocity of the blades is regulated with every shearing cycle in a manner which is to a certain extent independent of the actual speed of advance of the rolled stock and the actual length of the shearing to size.
  • the electric motor associated with the drums is continuously controlled and governed by a control circuit comprising an electronic processor able to calculate the optimum velocity of the motor between one shearing operation and the next, to take the shearing blades, after a pre-set whole number of pitches, to shear the rolled stock at the desired point, to the desired length and within the pre-set tolerance.
  • the motor associated with the blade-bearing drums, between one shearing operation and the next, is made to oscillate, that is to say, it is decelerated or accelerated with respect to a nominal reference velocity of rotation (shearing velocity) and then accelerated or decelerated until it again reaches the nominal reference velocity of rotation, in order to annul any possible difference (either ahead or delayed) of the rotary blades with respect to the exact moment of shearing the rolled stock.
  • the nominal reference velocity that is to say, the shearing velocity, is equal to the speed of advance of the rolled stock plus the extra speed.
  • the pendular velocity of the blade-bearing drums,- or the deceleration and acceleration curves is rephased according to the nominal shearing length to be obtained and the actual speed of advance of the rolled stock, while the nominal reference velocity of the blade- bearing drums remains unchanged.
  • the invention provides a shears with two drums, facing each other and in continuous counter-rotation, equipped with specific blades for shearing to size and possibly other blades, located adjacent to the first, in order to scrap the leading and trailing ends of the rolled stock.
  • Fig. 1 is a view from above, in diagram form, of a shears according to the invention
  • Fig. 2 is a partial and enlarged view from A to A of Fig. 1
  • Fig. 3 is a graph showing the development of the angular velocity of the motor of the shears shown in Fig. 1
  • Fig. 4 is a graph showing the development of the torque of the motor of the shears shown in Fig. 1.
  • a shears 10 according to the invention comprises a vertical frame 11 on which two rotating shearing drums 12 and 13 are mounted, arranged with their axes of rotation horizontal and parallel .
  • each drum 12 and 13 two blades 14a, 14b and respectively 15a, 15b (Fig. 2) are mounted lengthwise and on diametrically opposite sides.
  • the latter are suitable to shear to size rolled stock 16 emerging from a finishing train 17 (Fig. 1) of a hot rolling mill, located upstream of the shears 10.
  • the rolled stock 16 can be for example a bar, a rod or similar.
  • Fig. 2 Near the lateral edges of the drums 12 and 13 , four blades 18 and respectively 19 (Fig. 2) can also be mounted to scrap the segments of the leading and trailing ends of the rolled stock 16.
  • the drums 12 and 13 are counter-rotating, so that with every rotation through 180° the blades 14a, 15a and 14b, 15b are in the shearing position shown in Fig. 2.
  • the drums 12 and 13 are made to rotate on command from a single electric motor 21, the shaft of which is connected to the drums 12 and 13 by means of a reduction gear, of a known type, arranged inside the frame 11 and which is not shown in the drawings .
  • the motor 21 is controlled by an electric circuit 22, which comprises an electronic processor 23 and a command console 24.
  • a first transducer 26 is mounted in correspondence with a guide 28 to guide the rolled stock 16 to monitor the actual speed of advance Vi thereof, a second transducer 27a is mounted inside the frame 11 to monitor the angular position of the shearing blades 14a, 15a and 14b, 15b, and a third transducer 27b is assembled on the motor 21 to monitor the angular velocity V a of the drums 12 and 13.
  • the transducers 26, 27a and 27b are suitable to send corresponding electric, analogic or digital signals to the processor 23.
  • a single-channel switching device 30 is arranged upstream of the shears 10 and is suitable to oscillate on a horizontal plane to guide the rolled stock 16 towards the shearing to size blades 14a, 15a and 14b, 15b, towards the scrapping blades 18 and 19, if included, and towards the empty spaces 20 next to the blades 14a, 15a and 14b, 15b.
  • An actuator 31, controlled by the processor 23, is suitable to command the displacement of the switching device 30.
  • a fourth transducer 32 is assembled on the actuator 31 to monitor the position of the switching device and to send a corresponding electric, analogic or digital signal to the processor 23.
  • a central guide channel 33 and two lateral guide channels 34 Downstream of the shears 10 there is a central guide channel 33 and two lateral guide channels 34, to guide the rolled stock 16 towards other processing stations of the rolling mill, of a known type and not shown in the drawings and, respectively, any possible scrapped segments towards containers, which are also of a known type and are not shown in the drawings .
  • the diameter of the shearing to size blades 14a, 14b, and respectively 15a, 15b is 605 mm, and therefore the pitch "p" between the two blades of the same drum 12 and 13, which in this case corresponds to half the circumference, is equal to 950.33 mm. It is obvious that there may be more than two shearing to size blades for each drum 12 and 13, advantageously a multiple of two, in which case the pitch "p" will be proportionately reduced.
  • rolled stock 16 is sheared to form bars of a set nominal length L n , for example 60m (60,000 mm) .
  • the rolled stock 16 leaves the finishing train 17 at a temperature of about 850° and to take into account that the rolled stock 16 will contract in the cooling bed, downstream of the shears 10, the actual length L e of the bar to be sheared is increased by about one per cent, and therefore L e is around 60600 mm.
  • the drums 12 and 13 are made to rotate at an angular velocity V a such that the peripheral velocity Vp of the blades 14a, 14b, 15a and 15b is more than the rolling velocity Vi , at least during the shearing steps.
  • the angular velocity V a is pre-set irrespective of the actual length L e and of the shearing to size tolerance.
  • the rolled stock 16 should be sheared to the set length L e after a whole number of pitches "p" . If the drums 12 and 13 rotated at a constant velocity, such that the peripheral velocity Vp were equal to the rolling velocity Vi , it would be possible to obtain only cuts with a length equal to whole multiples of the pitch "p" .
  • the peripheral velocity Vp of the blades 14a, 14b, 15a and 15b is calculated by the processor 23 so as to keep it equal to the reference nominal velocity a little before and a little after the shearing operation, and so that it is such as to take one pair of blades 14a-15a, or 14b-15b to the shearing point exactly when the point of the rolled stock 16 which has to be sheared to the desired length is passing.
  • the processor 23 which, according to the value of the length L e , which can be set by means of the console 24 or programmed and memorised in an internal memory, calculates the number (Np) of pitches "p" to be made between one shearing operation and the next, or in the time T e , and also the value of the velocity of the motor 21 and hence of the drums 12 and 13 , taking into account the actual value of the velocity Vi at which the rolled stock 16 advances, as monitored by the transducer 26.
  • the processor 23 calculates the development of the deceleration/ acceleration curves of the drums 12, 13 in the interval between two successive shearing operations so that the number of pitches made by the drums 12 , 13 substantially corresponds to the length of the rolled stock 16 to be sheared.
  • the processor 23 is also suitable to calculate an additional number N a of pitches "p" to be associated with the superspeed set, or the difference between the peripheral speed of rotation of the drums 12, 13 and the speed of advance of the rolled stock 16, and therefore the actual or total number Nt of pitches "p" will be given by the sum of Np and N a .
  • the period of time T e is divided into five periods T1-T5 (Fig. 3) during which the processor 23 performs the following operations :
  • the motor 21 is made to rotate at a constant angular velocity V a , for example 813 rpm, which, given the transmission ratio between the drive shaft and the drums 12 and 13 , corresponds to an angular velocity V of the latter of 167.95 rad/secs.
  • the processor 23 processes the data of the velocity Vi and the length L e and determines by how much, if at all, to slow down and/or accelerate the motor 21 and the drums 12 and 13 so that the shearing to size blades 14a-15a or 14b-15b are at the shearing point exactly when the rolled stock 16 has covered the length L e .
  • the motor 21 is made to decelerate until it reaches a pendular velocity V , for example 770 rpm, calculated by the processor 23.
  • the value of the pendular velocity V m will be between a minimum and a maximum, according to the tolerance set by the actual length L e .
  • the pendular velocity V m can be greater or smaller than the angular velocity V a , according to the number t of pitches "p" . Or, if a positive difference Ld (Lp is greater than L e ) corresponds to a set angular velocity V a , the pendular velocity V m will be less than the angular velocity V a , while if a negative difference h_ (Lp is less than Le) corresponds to a set angular velocity V a , the pendular velocity V m will be greater than the angular velocity V a .
  • time T3 which corresponds to 0.1 sec
  • the motor 21 is kept at the pendular velocity V m and then, for the period of time T4 , corresponding to about 0.25 sees, the motor is accelerated until it returns to the constant velocity V a .
  • the motor 21 is kept at the nominal reference velocity, which coincides with the angular velocity V a , so that any possible oscillation in the velocity of the motor 21 will be mitigated and annulled.
  • the motor torque is 453 Nm for time Ti , it goes down to -1481 Nm during the deceleration step ( 2), it goes up again to 453 Nm in time T3 , rises to 2387 Nm for time T4 and returns to 453 for time T5.
  • a single blade 14a, respectively 15a could be provided instead of a pair of shearing to size blades for each drum 12, 13, a single blade 14a, respectively 15a could be provided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shearing Machines (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Abstract

L'invention concerne une cisaille à rotation continue pour le cisaillage aux dimensions d'un produit laminé (16) avançant en continu à une vitesse prédéterminée (V1). La cisaille est constituée de deux tambours (12, 13), d'au moins une lame à cisailler (14a, 15a ou 14b, 15b) montée sur chaque tambour (12, 13), d'un moyen d'entraînement (21) qui met les tambours (12, 13) en contre-rotation et d'un circuit (22) pour commander le moyen d'entraînement (21). Le circuit (22) est conçu pour commander le moyen d'entraînement (21), de sorte qu'il imprime sur les tambours (12, 13) une vitesse angulaire (Va) de sorte que, au moins au moment du cisaillage, la vitesse périphérique (Vp) des lames (14a, 15a ou 14b, 15b) soit supérieure à ladite vitesse d'avance (V1) de ladite pièce laminée (16). Par ailleurs, dans l'intervalle de temps (Te) entre chaque opération de cisaillage de ladite pièce (16), le circuit (22) alimente le moyen d'entraînement (21) de manière pendulaire, dans au moins une étape de décélération et une phase d'accélération selon la vitesse pendulaire (Vm), de manière qu'une paire de lames de cisaillement (14a, 15a ou 14b, 15b) soit déplacée et mise sur un point de cisaillement, exactement après le passage de la longueur voulue de pièce laminée (16) à cisailler.
PCT/IB1999/001990 1998-12-23 1999-12-13 Cisaille a rotation continue, pour pieces laminees, et procede de cisaillement relatif Ceased WO2000038868A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU15112/00A AU1511200A (en) 1998-12-23 1999-12-13 Continuously rotating shears for rolled stock and relative shearing method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUD98A000224 1998-12-23
IT1998UD000224A IT1302823B1 (it) 1998-12-23 1998-12-23 Cesoia a rotazione continua per prodotti laminati e relativoprocedimento di taglio

Publications (1)

Publication Number Publication Date
WO2000038868A1 true WO2000038868A1 (fr) 2000-07-06

Family

ID=11422807

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1999/001990 Ceased WO2000038868A1 (fr) 1998-12-23 1999-12-13 Cisaille a rotation continue, pour pieces laminees, et procede de cisaillement relatif

Country Status (3)

Country Link
AU (1) AU1511200A (fr)
IT (1) IT1302823B1 (fr)
WO (1) WO2000038868A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE630233A (fr) *
US2425484A (en) * 1946-07-19 1947-08-12 Morgan Construction Co Electrically driven rotary shear
DE1513248A1 (de) * 1964-03-02 1969-07-03 Zd Y V I Plzen Narodni Podnik Verfahren zur Regelung der Lage bei fliegenden Rotationsscheren
FR2333604A1 (fr) * 1975-12-04 1977-07-01 Kawasaki Heavy Ind Ltd Machine a cisailles volantes du type a tambours rotatifs

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE630233A (fr) *
US2425484A (en) * 1946-07-19 1947-08-12 Morgan Construction Co Electrically driven rotary shear
DE1513248A1 (de) * 1964-03-02 1969-07-03 Zd Y V I Plzen Narodni Podnik Verfahren zur Regelung der Lage bei fliegenden Rotationsscheren
FR2333604A1 (fr) * 1975-12-04 1977-07-01 Kawasaki Heavy Ind Ltd Machine a cisailles volantes du type a tambours rotatifs

Also Published As

Publication number Publication date
AU1511200A (en) 2000-07-31
ITUD980224A0 (it) 1998-12-23
IT1302823B1 (it) 2000-09-29
ITUD980224A1 (it) 2000-06-23

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