US3811312A - Drawing-pulley group for a wire-drawing machine for thin metal wires - Google Patents

Drawing-pulley group for a wire-drawing machine for thin metal wires Download PDF

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Publication number
US3811312A
US3811312A US00319185A US31918572A US3811312A US 3811312 A US3811312 A US 3811312A US 00319185 A US00319185 A US 00319185A US 31918572 A US31918572 A US 31918572A US 3811312 A US3811312 A US 3811312A
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United States
Prior art keywords
pulley
wire
pulleys
group
drawn
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Expired - Lifetime
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US00319185A
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English (en)
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P Pietroni
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TECHNOFIL SpA
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TECHNOFIL SpA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/02—Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums
    • B21C1/04—Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums with two or more dies operating in series
    • B21C1/06—Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums with two or more dies operating in series in which the material slips on the drums

Definitions

  • the pulleys are rotat- 0 ea c ably driven with the speed of rotation such that the speed of each pulley is higher than the preceding pulley and proportional to the elongation of the wire [56] UNITE SX$ES SZqFENTS being drawn because of reduction of its diameter.
  • the present invention refers in general to wiredrawing machines and, in particular, to a drawingpulley group for sliding wire-drawing machines for thin metal wires.
  • the first type comprises two driving shafts, each one being provided, in opposed directions with drawing pulleys of decreasing diameter, so that the wire passes alternately from one shaft to the other one and is coiled on pulleys of varying diameter.
  • the drawing operation as such takes place by means of suitable dies during the passing of the wire from one shaft to the other.
  • Drawing machines of this type have numerous drawbacks such as, for example, the noteworthy vibrations the shafts are subjected to by the repeated coiling on and off of the wire. These vibrations, in some cases, may even cause breaking of the shafts.
  • the coiling angle of the wire on each pulley is substantially constant at 180.
  • the drawing pulleys provided to receive the wire are aligned in parallel rows.
  • the wire is fully coiled for 360 onto each-drawing pulley, forming a coil, in which the points of arrival and end are in touch, with the therefrom resulting danger of breaking or damaging the coil turns.
  • the sliding of the wire relative to the drawing pulley is made difficult, be-
  • a third type of wire-drawing machine known as a single drawing pulley type. uses. to reduce the coiling angle of the wire on the pulleys, intermediate guide pulleys, resulting. obviously. in a rather bulky arrangement, a relatively high cost due to the doubling of the drawing and guide pulleys supporting shafts and the therefrom resulting dual motorization.
  • a principal object of the present invention to provide a drawing-pulley group for sliding drawing machines for metal wires, capable to reduce, if not eliminate, the above-mentioned troubles of the known wire-drawing machines.
  • the present invention comprises a group of drawing pulleys for wire-drawing machines of'the above type, having a supporting structure for a plurality for driven, rotating drawing pulleys receiving, one after the other, a metal wi're to be drawn.
  • the axes of rotation of the pulleys are parallel one to'the other and suitably spaced.
  • a die is positioned between two adjacent drawing pulleys to ensurea predetermined reduction of the diameter of the wire passing between the two pulleys.
  • Each drawing pulley being so controlled as to rotate, relative to the preceding drawing pulley, at a higher speed proportional to the elongation of the wire because of the reduction of its diameter.
  • the group is characterized by the drawing pulleys being arranged disposed along a spiral line or path.
  • the coiling angle of the wire is always lower than 360, resulting in the almost complete elimination of any contact between the single turns.
  • the coiling angle decreases progressively with the reduction in the diameter of the wire, because the beginning point is at the periphery of the spiral, ensuring therefrom optimum sliding conditions also on the last pulleys.
  • the wire is always coiled in the same direction of rotation, that is, in the technologically best condition and no transmission pulleys are required to decrease the coiling angle; a fact permitting a notable economy in cost, plant, operation and space.
  • the present invention provides in addition, a sliding wire-drawing machine for metal wires, equipped with a drawing pulley group as detailed hereinabove.
  • the drawing-pulley group is formed of a plurality of pulleys 1'4 with the axes of rotation in parallel and uniformly spaced one from the other.
  • the pulleys 14 are substantially placed in a plane along a spiral path or line.
  • FIG. 2 shows .also, that between the successive pulleys 14, there is always disposed a die 16 known per se, for the progressive reduction of the wire to be drawn.
  • spiral line indicates any type of line or path spirally turning one or more times around an assumed center point.
  • the arrangement of the spiral of pulleys thus permits the reduction "of the coiling angle, beginning at the outmost pulley, that is, the pulley at the beginning of the spiral and ending at the innermost pulley,
  • the coiling angle is the angle at the center of each single pulley l4 and the point, at which the wire leaves the pulley, measured in the direction of travel of the wire around the pulley.
  • the wire I5 is returned to the next to last pulley and I leaves the machine (toward the right in FIG. 2), passing and on relatively large diameters, so as to maintain the I specific contact pressure between wire and pulley at an acceptable level and, in any case, at a level, which ensures a long working life of the pulleys.
  • the fact that the wire 15 enters the spiral system at any one of the pulleys and leaves it from any one of the inner pulleys, of the spiral ensures with the reduction of the wire diameter also the progressive reduction of the ensuring winding angle and optimum sliding conditions,eliminating also the contact between the ends of the wire coil on each pulley.
  • a winding angle of 340 decreasingprogressively for each successive pulley to arrive at an angle of 300 at the last pulley.
  • each pulley 14 is supported at the end by a shaft 19, internally seated and guided, by means of rolling bearings 20, in an tubular element 21, welded to a supporting structure or frame 22 at the inside of the wire-drawing machine.
  • each shaft 19 is provided with two gear wheels 23 and 24.
  • the larger-diameter gear wheel 23 is connected by means of a cogged belt 25 with the smaller-diameter gear wheel 24 of the preceding pulley 14, that is, upstream in the direction of travel of the wire.
  • the increase in speed of successive pulleys 14, that is, downstream in the direction of travel of the wire will be proportional to the elongation of the wire because of the reduction of its section.
  • FIG. 3 also shows, that each pulley 14 is slightly displaced toward the outside relative to the immediately preceding one, permitting in this way the perfect alignment of the wire with the dies 16 positioned between the successive pulleys.
  • a wire-drawing machine provided with a system of drawing pulleys according to the present invention, to ensure a maximum number of twenty-two passages realized with single shafts and interchangeable I00 mm diameter drawing pulleys, keeping at the same time the overall dimensions of the machine at a mini mum.
  • the wire [5 will be subjected to a lower number of drawing steps than in the preceding case, with a therefrom resulting proportionally lesser reduction of diamdrawing machines presently known.
  • a drawing-pulley group for wire-drawing machines of the sliding type for thin metal wires having a supporting structure for a plurality of rotatably driven drawing pulleys, on which a metal wire to be drawn is progressively wound, said drawing pulleys having spaced, parallel rotation axes a plurality of dies positioned individually between adjacent successive pulleys to ensure a predetermined reduction of the diameter of a wire passing in operation through the dies, means for driving each pulley at a speed which, relative to the preceding pulley progressively increases and proportional to the elongation of the wire due to the reduction of its cross section, and the drawing pulleys being arranged in a group and arranged defining a spiral.
  • a drawing-pulley group for wire-drawing machines in which an outermost pulley is the inlet pulley for the wire to be drawn, and the innermost pulley is the outlet pulley for the drawn wire.
  • a drawing-pulley group for wire-drawing machines including guide pulleys for the wire, positioned outside of the drawing-pulley spiral group and provided for guiding the wire to be drawn to any intermediate drawing pulley of the spiral group.
  • a drawing-pulley group for wire-drawing machines in which each drawing pulley is slightly axially displacedto the outside relative to the immediately preceding drawing pulley.
  • a drawing-pulley group for wire-drawing machines in which each drawing pulley is supported at one end, a single drive shaft for each pulley, the other end of each drive shaft having two gear wheels, a cogged belt connecting one gear wheel to the corresponding gear wheel pair of the preceding pulley and to that of the following pulley for series control of the individual pulleys.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Extraction Processes (AREA)
US00319185A 1971-12-31 1972-12-29 Drawing-pulley group for a wire-drawing machine for thin metal wires Expired - Lifetime US3811312A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT33197/71A IT944627B (it) 1971-12-31 1971-12-31 Miglioramenti alle macchine trafi latrici per fili metallici sottili

Publications (1)

Publication Number Publication Date
US3811312A true US3811312A (en) 1974-05-21

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ID=11237011

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Application Number Title Priority Date Filing Date
US00319185A Expired - Lifetime US3811312A (en) 1971-12-31 1972-12-29 Drawing-pulley group for a wire-drawing machine for thin metal wires

Country Status (20)

Country Link
US (1) US3811312A (it)
JP (1) JPS4874459A (it)
AR (1) AR197696A1 (it)
AT (1) AT319173B (it)
BE (1) BE793026A (it)
BR (1) BR7209254D0 (it)
CA (1) CA971130A (it)
CH (1) CH553011A (it)
CS (1) CS168021B2 (it)
DD (1) DD102086A5 (it)
DE (1) DE2261813A1 (it)
ES (1) ES410187A1 (it)
FR (1) FR2166175B1 (it)
GB (1) GB1364809A (it)
HU (1) HU172427B (it)
IT (1) IT944627B (it)
LU (1) LU66742A1 (it)
NL (1) NL7217624A (it)
PL (1) PL82481B1 (it)
SU (1) SU504460A3 (it)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3955393A (en) * 1973-11-16 1976-05-11 British Insulated Callender's Cables Limited Wire drawing machine for in-line operation
US3979940A (en) * 1972-10-19 1976-09-14 British Insulated Callender's Cables Limited Wire drawing machinery
US4750344A (en) * 1985-11-01 1988-06-14 Ceeco Machinery Manufacturing Limited Wire drawing apparatus and method
WO1989012514A1 (en) * 1985-11-01 1989-12-28 Syncro Machine Co. Wire drawing apparatus and method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US413889A (en) * 1889-10-29 beguz
US778041A (en) * 1903-10-26 1904-12-20 Iroquois Machine Company Wire-making machinery.
US1973596A (en) * 1932-05-24 1934-09-11 Reuben C Yousey Capstan for wire drawing machines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US413889A (en) * 1889-10-29 beguz
US778041A (en) * 1903-10-26 1904-12-20 Iroquois Machine Company Wire-making machinery.
US1973596A (en) * 1932-05-24 1934-09-11 Reuben C Yousey Capstan for wire drawing machines

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3979940A (en) * 1972-10-19 1976-09-14 British Insulated Callender's Cables Limited Wire drawing machinery
US3955393A (en) * 1973-11-16 1976-05-11 British Insulated Callender's Cables Limited Wire drawing machine for in-line operation
US4750344A (en) * 1985-11-01 1988-06-14 Ceeco Machinery Manufacturing Limited Wire drawing apparatus and method
WO1989012514A1 (en) * 1985-11-01 1989-12-28 Syncro Machine Co. Wire drawing apparatus and method

Also Published As

Publication number Publication date
IT944627B (it) 1973-04-20
AT319173B (de) 1974-12-10
NL7217624A (it) 1973-07-03
CA971130A (en) 1975-07-15
LU66742A1 (it) 1973-02-22
CH553011A (de) 1974-08-30
AR197696A1 (es) 1974-04-30
BE793026A (fr) 1973-04-16
GB1364809A (en) 1974-08-29
JPS4874459A (it) 1973-10-06
FR2166175A1 (it) 1973-08-10
FR2166175B1 (it) 1978-02-10
DD102086A5 (de) 1973-12-05
SU504460A3 (ru) 1976-02-25
DE2261813A1 (de) 1973-07-05
CS168021B2 (it) 1976-05-28
HU172427B (hu) 1978-08-28
BR7209254D0 (pt) 1973-09-18
ES410187A1 (es) 1975-12-16
PL82481B1 (it) 1975-10-31

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