Background technology
The dimensional homogeneity of zinc-coated steel wire for main rope of suspension bridge and glacing flatness are to guarantee the even and straight basis of main push-towing rope deadweight.The aerial spin processes (Air spinning) of U.S.'s initiative main rope of suspension bridge establishment in 1844 is called for short the AS method.At the scene of bridge construction establishment strand, require steel wire that certain radian is arranged, influence normally carrying out of " spinning " to prevent that steel wire is at random.U.S. Bethlehem Steel Company had developed prefabricate parallel steel wire strand (Prefabricated paralled wire strang) in 1969, was called for short the PWS method, made main push-towing rope set up stable more and safety.Injury-free and do not reduce the toughness plasticity index of steel wire for guaranteeing that Steel Wire Surface has a zinc coat of good antiseptic property, the requirement of " the main push-towing rope steel wire does not allow the cold working of mechanical alignment or any other form after zinc-plated " (No machine stralghtening or any other cold working ofwire shall be permitted after galvanizing) is arranged on traditional main rope of suspension bridge technical drawing.Thereby the manufacturing of such steel wire all is by the requirement of AS method in the world, the finishing operation of galvanizing operation as this steel wire.Diameter is that the zinc-coated wire dimensional accuracy of 5mm series can only reach ± 0.06mm, and the Freezone footpath of steel wire can only be accomplished about 5m, is equivalent to about every meter arc length rise 50mm, and the zinc layer can only be the crystalline state of molten zinc.Also once for the dimensional accuracy that improves steel wire, the Freezone footpath that increases steel wire and the compactness that improves the zinc layer, the steel wire after zinc-plated was carried out mechanical alignment and cold working, the fragility after the work hardening of whole invar silk increases and disabled in the past.
China, exposes after its inherent shortcoming from nineteen ninety-five Guangdong Humen Bridge employing AS method in the manufacture method of main rope of suspension bridge, and main rope of suspension bridge has subsequently all adopted the PWS manufactured.
Summary of the invention
The purpose of this invention is to provide and a kind ofly improve the steel wire dimensional accuracy, increase steel wire Freezone footpath and improve zinc layer compactness and do not reduce the manufacturing method of zinc-coated steel wire for main of zinc layer quality and steel wire toughness plasticity index.
For realizing above purpose, technical scheme of the present invention provides a kind of manufacturing method of zinc-coated steel wire for main rope of suspension bridge, it is characterized in that, zinc-coated wire is implemented the rule garden, and its method is:
(1). at first the steel wire after zinc-plated is placed on the pay off rack of band back tension, steel wire enters nib or roller die through guide roller, its drafts≤0.15mm;
(2). enter temperature then and be 100-300 ℃ induction heater heating, cool off at bosh the steel wire back of coming out;
(3) pass through regulating wheel and rubber pinch roll again, control tension force is 500-1000N, by gathering sill and cutter, enter the guide pipe of weaving silk, the import department of two take-up reels about extending to is tangential direction with wire loop, and the take-up reel diameter can be adjusted at ∮ 1500-2200mm;
(4) at last will be wherein take-up reel counter-rotating, and to this take-up reel advance the steel wire guide pipe by corresponding radian curvature conversion importer to, just can realize batching automatically of different rotation directions half and half.
Described cutter is provided with the cutting to length device; Described guide pipe and the take-up reel of weaving silk has two groups that are complementary.
The present invention carries out rule garden by roller die and/or nib to zinc-coated wire to the steel wire after the galvanizing, to obtain the fine and close and positive steel wire of garden metric of zinc layer.On the device of certain tension force and uniform temperature, do simultaneously heating in short-term, obtaining the quite straight steel wire and the steel wire coil of left and right sides rotation direction, for the security and the durability of main rope of suspension bridge provides basic condition.
Any form machinery alignment and the cold working of zinc-plated back steel wire, the capital causes the toughness plasticity of zinc coat damage and steel wire to reduce, the present invention joins alignment, cold working and heat treatment three together, the raising of steel wire dimensional accuracy, be to finish, improved the compactness of zinc layer simultaneously by slight extension of the steel wire of roller die or nib; And alignment is to finish by stretching force and heat treatment; forward pull is by the pay off rack back tension; the deformation force of directive wheel frictional force and roller die or nib is formed; backward pull is by the regulating wheel differential force; rubber wheel pinches power and forms; the steel wire of belt tension heats by induction heater; when implementing alignment; the cold-working phenomenon that may cause through slight extension is replied; the shaped distortion of steel wire in roller die or the nib; mainly be evenly shaped to zinc coat; press the temperature computation of " cold working " of zinc; it is the plastic deformation in the time of≤4.2 ℃; even thereby base steel has slight flow harden; also eliminated when heating, the Freezone of steel wire directly increases, and is by having the pay off rack of back tension; the regulating wheel of directive wheel and belt tension and pinch roll are when forming certain tension force; steel wire passes through in the heating furnace of uniform temperature; become the good steel wire of linearity, in heating furnace, simultaneously the slight flow harden of extending of steel wire is replied, have good toughness plasticity index to guarantee steel wire.
Advantage of the present invention is:
1. the zinc-coated steel wire for main made of the present invention, its dimensional accuracy can be accomplished ± 0.04mm; The Freezone of steel wire directly reaches more than the 8.5m, is equivalent to below every meter arc length rise 30mm; The elongation after fracture of steel wire (original gauge length is 250mm) reaches more than 4%; The alternating bending of steel wire reaches more than 4 times; Zinc layer weight reaches 300g/m
2More than.
2. obtain steel wire and batch about rotation direction half and half requirement
For eliminating self reversing of main cable strand, steel wire rotation direction that require to form strand be about half and half, for example, by the strand that 127 steel wires are formed, need by 63 left-handed steel wires and 64 dextrorotation steel wire establishments, the present invention presses preseting length by two take-up reels, be called that scale is alternate to be batched, as long as make wherein take-up reel counter-rotating, and to this take-up reel advance the steel wire guide pipe by corresponding radian curvature conversion importer to, just can realize batching automatically of different rotation directions half and half.
3. by the requirement of main push-towing rope length, set the highest multiple length number of lumber recovery
Zinc-coated steel wire for main must be made up of a steel wire, joint when any connection production line is produced continuously comprises that raw material, half-finished electric connection all must cut only, and the present invention has the device of cutting to length, conversion take-up reel, as long as set by most economical multiple length, just can implementation and operation.
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples.
Embodiment
As shown in Figure 1, be manufacturing process flow diagram of the present invention, its method is:
(1). at first the steel wire after zinc-plated 1 is placed the band back tension pay off rack on 2 and 3, steel wire 1 enters nib 5 or roller die 6, its drafts≤0.15mm through guide roller 4 and 7;
(2). enter temperature then and be 200 ℃ induction heater 8 heating, steel wire 1 comes out the back in bosh 9 coolings;
(3) pass through regulating wheel 10 and rubber pinch roll 11 again, control tension force is 700N, by gathering sill 12 and cutter 13, enter the guide pipe 14 of weaving silk, the import department of two take-up reels 15 about extending to is tangential direction with wire loop, and the take-up reel diameter is at ∮ 1900mm; Weave silk guide pipe 14 and take-up reel 15 has two groups that are complementary, and described cutter 13 is provided with the cutting to length device.
(4) at last will be wherein a take-up reel 15 counter-rotatings, and to this take-up reel 15 advance the steel wire guide pipe by corresponding radian curvature conversion importer to, just can realize batching automatically of different rotation directions half and half.
Operating personnel can be in operating desk 16 operations.
Technological parameter of the present invention mainly is drafts, heating-up temperature, tension force and speed.Its medium velocity is pressed heating furnace power and Steel Wire Surface situation and is done suitably to adjust and select, and the diameter tolerance of final steel wire total amount can be controlled in ± and 0.01mm guaranteed.
Following table is listed to be the main performance index that adopts three zinc-coated steel wire for main rope of suspension bridge of this invention manufacturing
As can be known from the above table, implement the steel wire that this invention obtained, have high dimension precision, quite straight steel wire, fine and close zinc coat, do not reduce the mechanical property of zinc-coated wire, be a kind of, be the security of main rope of suspension bridge and the durability condition that provides the foundation with the epoch-making steel wire manufacture method of PWS method establishment main push-towing rope.