US3841180A - Dividing rolled lengths of stock into merchant lengths - Google Patents

Dividing rolled lengths of stock into merchant lengths Download PDF

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Publication number
US3841180A
US3841180A US00402015A US40201573A US3841180A US 3841180 A US3841180 A US 3841180A US 00402015 A US00402015 A US 00402015A US 40201573 A US40201573 A US 40201573A US 3841180 A US3841180 A US 3841180A
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United States
Prior art keywords
length
lengths
merchant
rolled
last
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
US00402015A
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English (en)
Inventor
F Gutlbauer
M Meyer
C Schlanzke
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Schloemann AG
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Schloemann AG
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Filing date
Publication date
Application filed by Schloemann AG filed Critical Schloemann AG
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Publication of US3841180A publication Critical patent/US3841180A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0007—Cutting or shearing the product
    • 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
    • B21B37/70—Length control
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0007—Cutting or shearing the product
    • B21B2015/0014—Cutting or shearing the product transversely to the rolling direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B43/00—Cooling beds, whether stationary or moving; Means specially associated with cooling beds, e.g. for braking work or for transferring it to or from the bed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B43/00—Cooling beds, whether stationary or moving; Means specially associated with cooling beds, e.g. for braking work or for transferring it to or from the bed
    • B21B43/12—Devices for positioning workpieces "flushed", i.e. with all their axial ends arranged in line on cooling beds or on co-operating conveyors, e.g. before cutting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/04—Processes
    • Y10T83/0405—With preparatory or simultaneous ancillary treatment of work
    • Y10T83/041—By heating or cooling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/202—With product handling means
    • Y10T83/2092—Means to move, guide, or permit free fall or flight of product
    • Y10T83/2096—Means to move product out of contact with tool
    • Y10T83/2098—With means to effect subsequent conveying or guiding
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/202—With product handling means
    • Y10T83/2092—Means to move, guide, or permit free fall or flight of product
    • Y10T83/22—Means to move product laterally
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/465—Cutting motion of tool has component in direction of moving work
    • Y10T83/4653—With means to initiate intermittent tool action
    • Y10T83/4656—Tool moved in response to work-sensing means
    • Y10T83/4659—With means to vary "length" of product
    • Y10T83/4662—To vary an end-product "length" [e.g., "crop cut"]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/465—Cutting motion of tool has component in direction of moving work
    • Y10T83/4699—Combined with other type cutter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/647—With means to convey work relative to tool station
    • Y10T83/6476—Including means to move work from one tool station to another

Definitions

  • the method is carried out so that the rolled length of stock is divided into a number of integral multiple lengths of a merchant length together with a last multiple length which is an integral multiple of a merchant length plus a discard length and is longer by the discard length than the longest integral multiple length in the respective batch.
  • the invention relates to a method of dividing rolled lengths of stock (which may be of any suitable section) into merchant lengths.
  • the rolled lengths of stock are initially divided into integral multiple lengths of the merchant lengths (such multiple lengths may be termed part-lengths) prior to being cooled in a cooling bed, with due reference to the maximum and minimum lengths permitted by the cooling bed and with reference to the total length of each length of stock as measured and computed, a plurality of multiple lengths are batched together, and each batch is divided into merchant lengths.
  • pages 104/108 prior to dividing the rolled lengths into order lengths or merchant lengths, they are subdivided upstream of the cooling bed into such multiple lengths as give optimum utilizationof the cooling bed; thus discard lengths are obtained when the multiple lengths are subdivided by cold shears or saw at-a position downstream of the cooling bed.
  • At least the last multiple length from the whole rolled length of stock is made longer by a-discard length than the longest integral multiple length within a batch-for cold shearing; if desired, the discard length of a whole rolled length of stock may be distributed over two multiple lengths.
  • the method presupposes that the length of the cooling bed is longer by approximately one merchant length than the maximum permissible'integral multiple length so that the calculated discard length can be added to the longest integral multiple length.
  • the method of the invention ensuresthat when the multiple lengths, which are delivered together in batches, are subsequently divided into merchant lengths, the discard lengths are cropped off last and can be easily ejected transversely to the delivery table.
  • the charge weight of the billet must form the basisfor calculating the discard length.
  • This weight can be supplied to a computer which calculates the total rolled length by reference to the initial and final crosssections and controls shears which are disposed upstream of the cooling bed in such a way that the rolled length of stock, whose length is precalculated, is subdivided into integers of multiple lengths of the merchant lengths; the multiple lengths from one total rolled length can be of different magnitude with respect to each other as well with respect to those of a different total rolled length. Due allowance must be made for the fact that the multiple lengths may vary only within the maximum and minimum lengths which are to be delivered to the cooling bed, the longest integral multiple length having to be smaller than the length of the cooling bed by the amount of one merchant length.
  • the discard length or the total rolled length can only be theoretically precalculated, it is necessary to take into account any changes of length which might occur in practice. These changes may be the result of errors in defining the charge weight of the billet or they may be due to variations in the amount of scale and cropping end lengths or they may be due to crosssectional changes which in turn are the result of groove wear and temperature differences in the rolled stock.
  • the length changes which result from these variables may amount to up to 15 m under unfavorable conditions, given a billet charge weight of 1,000 kg and a finished diameter for the rolled stock of 12 mm.
  • the last but one or the last but one and the last but two multiple lengths may be made shorter by one or more merchant lengths than the maximum integral multiple length within one batch, and the end of each rolled le'ngth of stock maybe-sensed prior to cutting off said last but one or said last but one and last but two multiple lengths, said sensing being used to calculate the deviation of the actual rolled lengthfrom the calculated rolled length, such deviation being used to re-calculate the lengths of saidlast but one or said last but one and last. but two multiple lengths when they are cut off.
  • a bar-2 is discharged from a last rollstand 1, and is subdivided by flying'shears 3,into multiple lengths which are then supplied to a run-up roller table 4 on which they are, decelerated in a conventional manner;
  • the multiple lengths are then passed through a cooling bed 5 and at the end thereof are collected on a delivery roller table 6 in batches corresponding to the usable width of the roller table 6; thebatches are supplied to cold shears or a cold saw7 for subdividing into merchant lengths.
  • A-measuring position 8, incorporating a photocell in a conventional manner, is disposed upstream of the flying shears 3 and signals the passage of the leading bar end to a computer 9.
  • the bar velocity is transferred to the computer 9 in a conventional manner, for example by means of a tachometer 12 which is mounted on the last rollstand l and takes into account the roll diameter and the final cross-section of the bar.
  • the computer 9 has already precalculated the optimum multiple lengths and the prospective discard lengths before the rolled bar has been fed in, namely from the charge weight and by taking into account the preceding and following rolled bars, the specified merchant length and the minimum and maximum permissible lengths in the cooling bed.
  • the computer 9 controls the shears 3 via a pulse transmitter 11 in such a way that the total rolled length is subdivided into the calculated multiple lengths.
  • the discard length is included in the last multiple length, which is also the longest length.
  • the multiple lengths are appropriately pre-calculated on the basis that the multiple length preceding the last multiple length or the two multiple lengths preceding the last multiple length will be cut shorter by one or more merchant lengthsthan the maximum multiple length; in this manner the said two multiple lengths may actually be cut even shorter than the pre-calculated length or longer than the pre-calculated length by one or more merchant lengths.
  • the rolled bar length, calculated on the basis of the billet charge weight, is once again sensed prior to the last multiple length cuts.
  • FIG. 1 shows by reference to three examples the manner in which length deviations from the calculated rolled bar length, caused by different rolling conditions, are distributed over the individual multiple lengths.
  • the pre-calculation for bar No. I initially indicated that the first multiple length must be cut shorter than the maximum multiple length by one merchant length while the subsequent multiple lengths with the exception of the two multiple lengths preceding the last length may have the maximum length.
  • check measurement yields a negative deviation from the calculated length by approximately one merchant length.
  • the multiple length preceding the last length therefore had to be cut shorter than the maximum permissible length X,,,,,,' VL by two merchant lengths VL so that the last multi ple length X VL discard length RL together become longer than the maximum multiple length X VL permitted by the cooling bed (this is possible be cause the discard length can overhang'in the cooling bed and the maximum length permitted by the cooling bed is greater than the maximum integral multiple length permitted by the cooling bed).
  • FIG. 2 shows how the multiple lengths of the bar No. 2 are disposed upstream of the shears 7 and the discard length RL remains on the last length of the total rolled bar length after cutting off all the merchant lengths.
  • the discard length in this case can be easily pulled to one side either manually or by an automatically actuated pusher.
  • FIG. 3 shows the manner in which the computer 9 operates in conjunction with cold shearing batches which have different maximum multiple lengths.
  • the input constants may for example be defined as follows:
  • the computer 9 defined the following probable lengths from the weights of the billet:
  • the computer divides as follows:
  • The" first two multiplelengthsofthbarfi are re quired for the second cold shear batch. They must therefore not be longer than 9 VL. Thereafter the computer 9 must set the maximum multiple length again to VL because in the event of an excess quantity and given a maximum multiple length of 9 VL, the computer could not add anything to the last but one multiple length, which would already be 9 VL.
  • a method of dividing rolled lengths of stock into merchant lengths comprising:
  • Bar 4 lst multiple length 5* V 2nd multiple length 9 VL Third cold shear batch 3rd multiple length 8 VL 4th multiple length 9 VL RL )Fourth cold shear batch Total 33 VL RL Bar 5 is divided as follows: and all said multiplelengths respectively not greater than or less than the maximum or minimum B 5' length permitted by said cooling bed.
  • Bars which are rejected and removed due to defects are treated as though they had not been removed if there is only a short hold up; that is to say the respective cold shear batch is only incompletely filled and said rolled length o f stock is sensed prior to cutting off said last but one or said last but one and last but two multiple lengths, said sensing being used to calculate the deviation of the actual rolled length from the calculated rolled length, such deviation being used torecalculate the lengths of said last but one or said last but one and last but two multiple lengths when they are cut off.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Control Of Metal Rolling (AREA)
  • Shearing Machines (AREA)
US00402015A 1972-09-30 1973-10-01 Dividing rolled lengths of stock into merchant lengths Expired - Lifetime US3841180A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722248177 DE2248177A1 (de) 1972-09-30 1972-09-30 Verfahren zum abtrennen der restlaengen von den auf verkaufslaenge unterteilten walzstaeben

Publications (1)

Publication Number Publication Date
US3841180A true US3841180A (en) 1974-10-15

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Application Number Title Priority Date Filing Date
US00402015A Expired - Lifetime US3841180A (en) 1972-09-30 1973-10-01 Dividing rolled lengths of stock into merchant lengths

Country Status (5)

Country Link
US (1) US3841180A (it)
JP (1) JPS4971577A (it)
DE (1) DE2248177A1 (it)
FR (1) FR2201140B1 (it)
GB (1) GB1406200A (it)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4328725A (en) * 1979-10-05 1982-05-11 Hatebur Umformmaschinen Method of and apparatus for automatically discarding the front and rear ends of bars of material
US4526073A (en) * 1982-04-28 1985-07-02 Elhaus Friedrich W Method and an apparatus for shearing heated metal bars to billets
US4534002A (en) * 1983-01-19 1985-08-06 Republic Steel Corporation Method and apparatus to optimize cut lengths of material
US5125250A (en) * 1991-04-26 1992-06-30 China Steel Corporation Flying shear system with adaptive cut-length control and the operational method thereof
US5156033A (en) * 1988-09-01 1992-10-20 Nkk Corporation Method of cutting steel products in a rolling line
US5644941A (en) * 1994-05-31 1997-07-08 Sms Schloemann-Siemag Aktiengesellschaft Method and arrangement for severing and controlled cooling of individual rods from a rolled section
EP1266703A2 (en) * 2001-03-20 2002-12-18 General Electric Company System and method for optimizing mill cuts
US20030168135A1 (en) * 2001-05-30 2003-09-11 Noriaki Onodera Rail producing method and producing equipment
US20060237510A1 (en) * 2005-04-18 2006-10-26 Ghosh Pradip K Short bar separation and recovery system and method
US20110036137A1 (en) * 2010-04-30 2011-02-17 David Teng Pong Method and apparatus for producing cut to length bars in a steel mill
US20110056263A1 (en) * 2008-03-25 2011-03-10 Sumitomo Metal Industries, Ltd. Method for Producing Seamless Pipe and Method for Determining Length of Billet for Use in Producing Seamless Pipe
CN110576054A (zh) * 2019-10-25 2019-12-17 四川德胜集团钒钛有限公司 轧钢用棒材齐头装置
CN114273441A (zh) * 2021-12-02 2022-04-05 攀枝花钢城集团有限公司 一种钢材输送方法及系统

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2320147A1 (fr) * 1975-08-08 1977-03-04 Revigny Metallurg Machine a etirer, dresser, couper et polir
JPS52122981A (en) * 1976-04-07 1977-10-15 Kawasaki Steel Corp Method of dividing steel material
DE3333091A1 (de) * 1983-09-14 1985-03-21 SMS Schloemann-Siemag AG, 4000 Düsseldorf Verfahren zum fortlaufenden erfassen der teilwalzlaenge in einer kontin. walzstrasse und einrichtung zur durchfuehrung des verfahrens
FR2559409A1 (fr) * 1984-02-13 1985-08-16 Clairvaux Forges Cisaille a ebouter et a tronconner les barres sur un laminoir a chaud
DE3431030A1 (de) * 1984-08-23 1986-03-06 Kocks Technik Gmbh & Co, 4010 Hilden Verfahren und vorrichtung zum restendenlosen unterteilen und schopfen von rohr- oder stabfoermigem walzgut
AT381045B (de) * 1984-08-29 1986-08-11 Voest Alpine Ag Verfahren zum teilen von aus knueppeln gewalzten stabstaehlen
JPH0675804B2 (ja) * 1987-04-20 1994-09-28 株式会社神戸製鋼所 圧延条材の切断方法
JP6130652B2 (ja) * 2012-11-26 2017-05-17 寿産業株式会社 条鋼の短尺条鋼検出方法
CN114309093B (zh) * 2021-12-30 2023-07-25 重庆钢铁股份有限公司 板材上下冷床的方法、板材编码方法及板材编码辅助装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3149520A (en) * 1960-12-29 1964-09-22 Nat Steel Corp Automatic cycling of shear control

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3149520A (en) * 1960-12-29 1964-09-22 Nat Steel Corp Automatic cycling of shear control

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4328725A (en) * 1979-10-05 1982-05-11 Hatebur Umformmaschinen Method of and apparatus for automatically discarding the front and rear ends of bars of material
US4526073A (en) * 1982-04-28 1985-07-02 Elhaus Friedrich W Method and an apparatus for shearing heated metal bars to billets
US4534002A (en) * 1983-01-19 1985-08-06 Republic Steel Corporation Method and apparatus to optimize cut lengths of material
US5156033A (en) * 1988-09-01 1992-10-20 Nkk Corporation Method of cutting steel products in a rolling line
US5125250A (en) * 1991-04-26 1992-06-30 China Steel Corporation Flying shear system with adaptive cut-length control and the operational method thereof
US5644941A (en) * 1994-05-31 1997-07-08 Sms Schloemann-Siemag Aktiengesellschaft Method and arrangement for severing and controlled cooling of individual rods from a rolled section
EP1266703A3 (en) * 2001-03-20 2004-10-27 General Electric Company System and method for optimizing mill cuts
EP1266703A2 (en) * 2001-03-20 2002-12-18 General Electric Company System and method for optimizing mill cuts
US6698266B2 (en) * 2001-03-20 2004-03-02 General Electric Company System and method for optimizing mill cuts
US6931703B2 (en) * 2001-05-30 2005-08-23 Nippon Steel Corporation Rail producing method and producing equipment
US20030168135A1 (en) * 2001-05-30 2003-09-11 Noriaki Onodera Rail producing method and producing equipment
CN1298501C (zh) * 2001-05-30 2007-02-07 新日本制铁株式会社 钢轨的制造方法及其制造设备
US20060237510A1 (en) * 2005-04-18 2006-10-26 Ghosh Pradip K Short bar separation and recovery system and method
US7228972B2 (en) * 2005-04-18 2007-06-12 Morgan Construction Company Short bar separation and recovery system and method
US20110056263A1 (en) * 2008-03-25 2011-03-10 Sumitomo Metal Industries, Ltd. Method for Producing Seamless Pipe and Method for Determining Length of Billet for Use in Producing Seamless Pipe
US8770003B2 (en) * 2008-03-25 2014-07-08 Sumitomo Metal Industries, Ltd. Method for producing seamless pipe and method for determining length of billet for use in producing seamless pipe
US20110036137A1 (en) * 2010-04-30 2011-02-17 David Teng Pong Method and apparatus for producing cut to length bars in a steel mill
US8215145B2 (en) * 2010-04-30 2012-07-10 David Teng Pong Method and apparatus for producing cut to length bars in a steel mill
CN110576054A (zh) * 2019-10-25 2019-12-17 四川德胜集团钒钛有限公司 轧钢用棒材齐头装置
CN114273441A (zh) * 2021-12-02 2022-04-05 攀枝花钢城集团有限公司 一种钢材输送方法及系统

Also Published As

Publication number Publication date
FR2201140A1 (it) 1974-04-26
DE2248177A1 (de) 1974-04-11
FR2201140B1 (it) 1978-01-06
JPS4971577A (it) 1974-07-10
GB1406200A (en) 1975-09-17

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