US3810371A - Hot rolling method for obtaining wire rod - Google Patents

Hot rolling method for obtaining wire rod Download PDF

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Publication number
US3810371A
US3810371A US00193435A US19343571A US3810371A US 3810371 A US3810371 A US 3810371A US 00193435 A US00193435 A US 00193435A US 19343571 A US19343571 A US 19343571A US 3810371 A US3810371 A US 3810371A
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United States
Prior art keywords
wire rod
rolling
diameter
pickling
hot rolling
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Expired - Lifetime
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US00193435A
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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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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B2003/005—Copper or its alloys

Definitions

  • a hot rolling method for obtaining wire rod or the like of small cross section and with a high quality surface, particularly for copper wire rod comprising the steps -0f rolling the initial product in a multi-stand rolling mill including assemblies each with a number of rolls, simultaneously pickling the product being rolled, and raising the specific pressures generated'during the hot rolling to the very high values which .derive from working on wire rods below 6 mm. diameter and down to 2 mm. diameter.
  • the present invention relates to a hot rolling method for obtaining wire rod or the like of small cross section and with a high quality surface.
  • the method is particularly suitable for producing copper wire rod.
  • Copper wire rod for example for electrical uses, is conventionally obtained by hot rolling wire bars, semicontainuous cast billets or a continuous ingot obtained by various continuous casting methods.
  • Rolling is normally continued until wire rod is obtained with a diameter of about 6 mm.
  • After rolling pickling takes place and consists normally of immersing the coils of wire in tanks containing firstly a pickling liquid, then a wash liquid and possibly a protective liquid.
  • these operations can be carried out at the exit of the rolling millinside pipes in which liquids or gases flow which pickle and wash the wire rod before it is coiled.
  • the wire rod thus obtained has a powdery and irregular surface, which does not allow easy and economical drawing without breakages or scaling etc.
  • An object of the present invention is to obviate the aforementioned disadvantages relative to methods presently in use for the production of wire rod of small diameter, by providing a method by means of which it is possible to obtain wire rods having a diameter less than 6 mm. which are not affected by defects deriving from cracks inherent in said wire rods, i.e. defects which could still be found when the wire rods, during previous stages of the process being carried out, had already reached a diameter which was low but still greater than 6 mm.
  • Another object of the invention is that of providing a method which can be easily carried out by utilising rolling equipment of conventional type, without the need for using machines for surface shaving or other auxiliary equipment.
  • FIG. 1 is a frontal diagrammatical'view of a rolling mill for wire rod, according to a preceding patent of the same applicant, usable in the process according to the invention
  • FIG. 2" is a cross section through an assembly of the rolling mill of the preceding figure
  • FIG. 3 is aview of a rolling mill of old type (accord ing to another previous patent of the same applicant);
  • FIG. 4 is a cross section through an assembly of a rolling mill of old type (according to another previous patent of the same applicant).
  • FIG. 2 refers to this patent, in which one path for the lubricating liquid was predisposed for the gears and another path (which was distinct from the first) for the liquid used for cooling and/or lubricating the rolls and wire rod.
  • the invention takes development one step further.
  • each assembly. (FIGS. 1 and 2) of the rolling mill comprises separate paths for the lubricating liquid for the gears (as shown by the broken arrows 7 in FIG. 2), and for the cooling and/or lubricating liquid for the rolls 1 and wire rod 2 (continuous arrows).
  • tank member 6 (FIG. 1) disposed between one assembly and another.
  • the rolls 1 are disposed at 120 one to the other (FIG. 2) and the wire rod 2 being rolled is made to pass as stated immersed constantly. in the cooling and/or lu bricating liquid fed to the assemblies from above, at 3, and discharged lowerly, at 4.
  • the path of this liquid is represented by the continuous arrows in FIG. 2.
  • a special solution having a pickling action for example a mixture of water and methyl alcohol is added to said cooling and- /or lubricating liquid.
  • FIG. 2 shows an assembly with an upper input shaft, but obviously the disposition is the same for assemblies with a lower input shaft (for further details see the aforementioned Italian Pat. No. 796085, or corresponding U.S. Pat. No. 3552164.
  • the invention deliberately exploits the fact that while the load exerted by each roll on the metal increases, the contact surface through which the force is transmitted from the cylinder to the metal diminishes as the diameter of the rolled bar diminishes. This means that the specific pressure on the surface of the metal rises to very high values.
  • critical threshold corresponds to specific pressures which are generated when rolling wire rods less than 6mm. diameter and down to 2 mm. diameter.
  • the efficiency of the self welding action on the superficial irregularities is proportional to the absorbed powers, which in the example previously given are in the ratio of6 to 60, Le. ten times greater for the outlet assembly than for the inlet assembly. This is due to the considerable increase in specific pressures which arise when passing from the inlet assembly to the outlet assembly.
  • pickling solutions according to the process of the invention means that the most minute interstices or cracks contained on thesurface of the bar are reached by pickling action. Moreover the continuous compression action of the rolls through the rolling mill exerts a pressure welding action between the purified metallic particles in the surface of the bar.
  • any further drawing of this special copper wire rod is easy and reliable, and the wire is produced with economical and technical advantage because the operation is almost exempt from breakage and moreover, as it is possible to start from a smaller diameter, the drawing operation is made easier.
  • the process according to the invention allows the application of an ultracompression under hot conditions of the surface being pickled, so that the surface integrity of the rod being formed is automatically reconstituted. This takes place independently of any defects existing upstream of the rolling mill.
  • This reconstitutable surface integrity unknown in the art until the present time, also gives rise to a greater tolerance of impurities contained in the metals (in particular in copper) and makes it possible to use materials of poor quality even for the production of thin wire.
  • the application of the method according to the invention is very advantageous in plant for the continuous production of wire rod using continuous casting methods, for example with casting wheels according to previous designs of the present applicant.
  • the plant may comprise, for example, a wheel casting machine followed by a rolling mill in which the method according to the present invention is utilised, it in its turn being followed by a winding machine for the wire rod.
  • pickling substances used may be modified according to requirements and any method of feeding said substances may be used.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
US00193435A 1971-02-20 1971-10-28 Hot rolling method for obtaining wire rod Expired - Lifetime US3810371A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT2081271 1971-02-20

Publications (1)

Publication Number Publication Date
US3810371A true US3810371A (en) 1974-05-14

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ID=11172405

Family Applications (1)

Application Number Title Priority Date Filing Date
US00193435A Expired - Lifetime US3810371A (en) 1971-02-20 1971-10-28 Hot rolling method for obtaining wire rod

Country Status (13)

Country Link
US (1) US3810371A (enrdf_load_stackoverflow)
JP (1) JPS5246903B1 (enrdf_load_stackoverflow)
AT (1) AT317818B (enrdf_load_stackoverflow)
BE (1) BE774811A (enrdf_load_stackoverflow)
CA (1) CA932994A (enrdf_load_stackoverflow)
CH (1) CH554198A (enrdf_load_stackoverflow)
DE (1) DE2156444A1 (enrdf_load_stackoverflow)
FR (1) FR2125256B1 (enrdf_load_stackoverflow)
GB (1) GB1372246A (enrdf_load_stackoverflow)
HU (1) HU172179B (enrdf_load_stackoverflow)
NL (1) NL7114894A (enrdf_load_stackoverflow)
PL (1) PL77100B1 (enrdf_load_stackoverflow)
SE (1) SE376725B (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4094178A (en) * 1976-03-08 1978-06-13 Western Electric Co., Inc. Methods for continuous extrusion
US4569217A (en) * 1978-03-30 1986-02-11 Giulio Properzi Apparatus for converting rod stock or wire rod into wire
CN102989762A (zh) * 2012-11-09 2013-03-27 江苏熙友磁电科技有限公司 铜杆轧机

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE54841T1 (de) * 1985-07-10 1990-08-15 Gte Prod Corp Herstellungsverfahren fuer ein langgestrecktes produkt aus wolframhartmetall.
GB8924036D0 (en) * 1989-10-25 1989-12-13 Rollsec Ltd Reducing mill

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1835462A (en) * 1928-09-13 1931-12-08 American Electrical Works Wire drawing apparatus
US3529998A (en) * 1966-02-16 1970-09-22 Fritz Singer Pickling process
US3552164A (en) * 1967-03-29 1971-01-05 Ilario Properzi Rolling mill
US3608344A (en) * 1969-05-14 1971-09-28 Straaten Chemical Co Van Process for hot working of copper

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1835462A (en) * 1928-09-13 1931-12-08 American Electrical Works Wire drawing apparatus
US3529998A (en) * 1966-02-16 1970-09-22 Fritz Singer Pickling process
US3552164A (en) * 1967-03-29 1971-01-05 Ilario Properzi Rolling mill
US3608344A (en) * 1969-05-14 1971-09-28 Straaten Chemical Co Van Process for hot working of copper

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4094178A (en) * 1976-03-08 1978-06-13 Western Electric Co., Inc. Methods for continuous extrusion
US4569217A (en) * 1978-03-30 1986-02-11 Giulio Properzi Apparatus for converting rod stock or wire rod into wire
CN102989762A (zh) * 2012-11-09 2013-03-27 江苏熙友磁电科技有限公司 铜杆轧机

Also Published As

Publication number Publication date
DE2156444A1 (de) 1973-08-16
AT317818B (de) 1974-09-10
FR2125256A1 (enrdf_load_stackoverflow) 1972-09-29
CH554198A (de) 1974-09-30
HU172179B (hu) 1978-06-28
GB1372246A (en) 1974-10-30
FR2125256B1 (enrdf_load_stackoverflow) 1976-10-29
SE376725B (enrdf_load_stackoverflow) 1975-06-09
NL7114894A (enrdf_load_stackoverflow) 1972-08-22
CA932994A (en) 1973-09-04
JPS5246903B1 (enrdf_load_stackoverflow) 1977-11-29
BE774811A (fr) 1972-03-01
PL77100B1 (enrdf_load_stackoverflow) 1975-02-28

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