US3831410A - Safety device for rolling mills - Google Patents

Safety device for rolling mills Download PDF

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Publication number
US3831410A
US3831410A US00377303A US37730373A US3831410A US 3831410 A US3831410 A US 3831410A US 00377303 A US00377303 A US 00377303A US 37730373 A US37730373 A US 37730373A US 3831410 A US3831410 A US 3831410A
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United States
Prior art keywords
rolling
guide
stand
housing
outlet guide
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Expired - Lifetime
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US00377303A
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English (en)
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I Properzi
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Individual
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Individual
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Classifications

    • 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
    • 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
    • B21B1/16—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B39/14—Guiding, positioning or aligning work
    • B21B39/16—Guiding, positioning or aligning work immediately before entering or after leaving the pass
    • B21B39/165—Guides or guide rollers for rods, bars, rounds, tubes ; Aligning guides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
    • F16P5/00—Emergency means for rendering ineffective a coupling conveying reciprocating movement if the motion of the driven part is prematurely resisted
    • F16P5/005—Overload protection by energy absorbing components, e.g. breaker blocks, shear sections

Definitions

  • the rolling stands are notably rotated at a predetermined rotational speed by a kinematic gear chain, each shaft of which drives a single rolling stand.
  • the motor is connected to the drive pinion of the gear chain by means of a clutch preferably of electromagnetic type.
  • the safety measures adopted for preventing serious damage to the said kinematic chain consiste in making the coupling between each rolling stand and the relative drive shaft in the form of a safety coupling with shear pins. in this manner, if the predetermined torque limit is exceeded for any reason in any of the rolling stands, breakage occurs of the safety pin or pins of the said coupling. This latter is made in such a manner that the breakage of the safety pin gives rise to the movement of a tooth which then acts on a switch which in its turn opens'the electromagnetic coupling of the motor. When themotor is disconnected, the rolls of the rolling stands are free to stop under the braking action of the rolling forces.
  • the motor is decoupled by means of the electromagnetic joint because, on account of the high moment of inertia of the motor rotor, the stopping time for the rolling mill is thus reduced to a minimum.
  • the switch operated by the breakage of the safety pins of the coupling may act so as to simply interrupt the supply of current to the motor, possibly linking this to the closure of a suitable brake so as to reduce the stopping time of the rolling mill.
  • a rolling stand comprises a housing constructed in such a manner as to be able to house within it the rolls with their relative shafts, bearings and drive gears.
  • Each housing also comprises suitable inlet and outlet guides for the material being rolled; the purpose of the former is to ensure that the material arrives in the correct position at the rolls whereas the outlet guides control the rolled material leaving the stand so that it becomes directed towards the next stand or collection device (coiler, if dealing with the last stand).
  • the rolling mill is well adjusted and both the operating conditions and the conditions of the material are regular, the material being rolled passes from one stand to the next, reducing its own cross-section, guided by the said guides.
  • the rolled material finds it difficult to proceed, i.e., if the winding pull of the coiler is not present the last stand itself has to push the material out, which can be done only within certain limits.
  • the rod leaving the stand becomes subjected to a combined bending and compressive stress which at a certain point causes the rod to buckle immediately after the exit from the rolls. Under these conditions the rod does not enter the outlet guide, hits against the guide and fills all the cavities between the casing, the rolls and the guide.
  • a safety device for rolling mills has now been discovered, and constitutes the object of the present invention, which, while maintaining the advantages of the systems of the previous technique, eliminates the aforementioned disadvantages, the device being characterised in that the outlet guide for the rolled material, of at least the last stand, and preferably of each stand of the rolling mill, is fixed to the housing of the respective rolling stand by fixing means arranged to allow the guide to separate from the housing when said fixing means are subjected to a thrust greater than a predetermined value.
  • the main advantage of the safety device according to this invention is that strong braking actions on the rolls do not need to be reached (such as those that were necessary to cause breakage of the safety pin or pins of the coupling upstream of the rolling stand in devices according to the previous technique), but the separation or expulsion of the outlet guide from the corresponding housing of the rolling stand may take place and in fact takes place as soon as the material, instead of passing regularly into the guide, begins to press against its edge.
  • a further advantage of the device according to the invention is that the braking action of the flower on the roll begins to reach high values when the material has filled the entire cavity between the rolls and the guide, whereas the expulsion of the guide according to the present invention may take place a considerable and predetermined time before the breakage of the safety pin or pins of the drive coupling mounted upstream of the rolling stand.
  • a further advantageous aspect of the device according to the present invention is that the expulsion of the guide avoids large build-up of the material because the space occupied by the expelled guide becomes occupied by the material which the rolls still continue to roll before the stoppage of the entire rolling mill.
  • FIG. 1 is a diagrammatic representation of a rolling mill to which the device according to the present invention is applied;
  • FIGS. 2 and 3 are two vertical sections through a conventional rolling mill, in the nonnal working condition and with the flower formation respectively;
  • FIG. 4 is a diagrammatic partial sectional view of a rolling stand comprising a first embodiment of the safety device according to the present invention.
  • FIG. 5 is a view analogous to FIG. 4 of another embodiment of the device according to the present invention.
  • FIGS. 1 to 3 show a seven stand rolling mill (it being understood that the number of rolling stands does not constitute a limitation) comprising a motor which, by way of the electromagnetic clutch 11, is connected to the drive pinion 12 of a gear chain indicated overall by the reference numeral 13.
  • Each rolling stand 14 is coupled to the relative drive shaft by means of a coupling 15, preferably a shear pin safety coupling of the type conventionally used in rolling mills.
  • the rolling stand shown in FIGS. 2 and 3 is of the two roll type and comprises a housing 16 constructed so as to house within it both the rolls l7, driven by the shafts l8, and the relative shafts, bearings and drive gears, together with the inlet and outlet guides, 19 and 20 respectively, for the material 21 subjected to rolling.
  • FIG. 3 shows the state of the stand of FIG. 2 while the said flower" of rolled material is being formed.
  • FIG. 4 shows part of a rolling stand 22, of the three roll type disposed at 120 about the axis of the material being rolled, comprising a housing 23, in which the rolls 24 (of which only one is shown), an inlet guide (not shown) for the material to be rolled and an outlet guide 25 are housed.
  • the guide 25 is fixed to the housing 23 by screws 26 of predetermined fracture value, which is created by means of a suitable groove 27 made under their heads.
  • a tooth or chamfered collar 28 is fixed to the guide 25 by screws 29, with the purpose of operating the microswitch 30 by engaging with its relative control 31 when the guide 25 and hence the collar 28 are expelled from the housing following the shearing of screws 26.
  • the guide 25 is slidably mounted in a suitable bush 33 fixed rigidly to the housing 23 by screws 34.
  • the guide 25 is however locked to the bush 33 by a suitable safety pin 35, arranged to be sheared by the thrust exerted on the front mouth -of the guide by the material when it begins to form the flower."
  • the rear edge of the guide 25 also comprises a convenient chamfer for engaging the projecting end of the operating rod 31 of the microswitch 30.
  • a safety device for rolling mills arranged to interrupt the transmission of motion from the motor to the rolling stands, in which the outlet guide for the rolled material of at least the last stand of the rolling mill is fixed to the housing of the respective stand by fixing means arranged to allow the guide to separate from the housing when said fixing means are subjected to a thrust greater than a predetermined value, said outlet guide being arranged to engage switch means for interrupting the transmission of motion from the motor to the rolling stands.
  • said fixing means consist of screws having a weakened zone for starting the fracture when the outlet guide is thrust axially in a direction away from the housing of the rolling stand.
  • outlet guides of all the rolling stands can be separated from their respective housings by a thrust acting axially on the guide.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Metal Rolling (AREA)
US00377303A 1972-07-22 1973-07-09 Safety device for rolling mills Expired - Lifetime US3831410A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT2732272 1972-07-22

Publications (1)

Publication Number Publication Date
US3831410A true US3831410A (en) 1974-08-27

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ID=11221420

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Application Number Title Priority Date Filing Date
US00377303A Expired - Lifetime US3831410A (en) 1972-07-22 1973-07-09 Safety device for rolling mills

Country Status (6)

Country Link
US (1) US3831410A (fr)
JP (1) JPS4944960A (fr)
DE (1) DE2334688A1 (fr)
FR (1) FR2193657B3 (fr)
GB (1) GB1429733A (fr)
IT (1) IT963280A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3981171A (en) * 1974-11-12 1976-09-21 Siemens Aktiengesellschaft Twin drive for rolling mills
US4079608A (en) * 1976-02-19 1978-03-21 Giulio Properzi Multi-stand rolling mill with an overload protection device
CN110142301A (zh) * 2019-06-26 2019-08-20 张翔 一种铝合金料冷连轧成型方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5197537U (fr) * 1975-02-03 1976-08-05
IT1064628B (it) * 1976-07-12 1985-02-25 Innocenti Santeustacchio Spa Gabbia perfezionata per presso laminatoio
DE3303025A1 (de) * 1983-01-29 1984-08-02 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Vorrichtung an bearbeitungsmaschinen zum vermeiden von schaeden

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1599045A (en) * 1921-08-10 1926-09-07 Robert E Good Automatic means for disconnecting roll trains from the driving means
US3651674A (en) * 1968-10-24 1972-03-28 Nouv Soc Apparatus for guiding a product undergoing transformation, and the use thereof in a wire mill

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1599045A (en) * 1921-08-10 1926-09-07 Robert E Good Automatic means for disconnecting roll trains from the driving means
US3651674A (en) * 1968-10-24 1972-03-28 Nouv Soc Apparatus for guiding a product undergoing transformation, and the use thereof in a wire mill

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3981171A (en) * 1974-11-12 1976-09-21 Siemens Aktiengesellschaft Twin drive for rolling mills
US4079608A (en) * 1976-02-19 1978-03-21 Giulio Properzi Multi-stand rolling mill with an overload protection device
CN110142301A (zh) * 2019-06-26 2019-08-20 张翔 一种铝合金料冷连轧成型方法

Also Published As

Publication number Publication date
FR2193657B3 (fr) 1976-07-02
GB1429733A (en) 1976-03-24
DE2334688A1 (de) 1974-01-31
JPS4944960A (fr) 1974-04-27
FR2193657A1 (fr) 1974-02-22
IT963280A (fr) 1900-01-01

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