Trolley wire manufacturing method and trolley wire manufacturing device

Abstract

To provide a manufacturing method for trolley wire and a manufacturing apparatus for trolley wire which can manufacture trolley wire with high strength.SOLUTION: In manufacturing trolley wire 100 formed of a copper base material containing 0.25 weight% or more of tin, a plurality of capstans 32 transfer wire 10 and at the same time a plurality of dies 31 perform a wire drawing process and a grooving process. The wire drawing process and the grooving process are consecutively executed while performing cooling, using a first cooling mechanism 6 that sprays cooling water 60 to insides of the capstans 32, a second cooling mechanism 7 that cools the dies 31 by immersion and coating using wire drawing oil 70 and a third cooling mechanism 8 that coats the wire 10 with an aqueous lubricant 80 and stores the aqueous lubricant 80 in a capstan cover 81, so as to immerse the wire 10 in the aqueous lubricant 80.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a method and an apparatus for manufacturing a trolley wire. [Background technology]

[0002] Traditionally, copper and copper alloys have been mainly used for electric train wires (trolley wires) that supply power to trains via pantographs and other devices. While ordinary copper wire is made by cold drawing copper wire rods with a diameter of 8 mm or more through wire drawing dies, trolley wire is manufactured by cold drawing copper wire rods with a diameter of 20 mm or more. Since the strength of trolley wire is directly linked to its lifespan, there is a strong demand for both cost reduction and strength improvement. As a result, various efforts are being made by various manufacturers.

[0003] For example, there are manufacturers that manufacture trolley wires that achieve low costs by limiting the alloying elements added to the copper base material to only one inexpensive solid-solution strengthening element, and manufacturers that manufacture high-performance trolley wires with tensile strengths exceeding 500 MPa by adding multiple precipitation strengthening elements to the copper base material and then performing heat treatment.As shown in Patent Documents 1 and 2, the present applicant has provided high-strength, low-cost trolley wires by adding tin and indium, which are solid-solution strengthening elements, to the copper base material and by devising a manufacturing method for copper wire rods.

[0004] For general trolley wire, the wire drawing devices mainly used are single-head wire drawing machines, which have only one die arranged on the wire drawing line and repeat wire drawing and rewinding, and continuous wire drawing machines, which have multiple dies arranged on the wire drawing line.A known method of manufacturing trolley wire using a continuous wire drawing machine is one in which wire drawing is performed three times and grooving is performed once, as shown in Patent Document 3, for example.

[0005] When continuously drawing a contact wire, the heat generated during the process can cause a decrease in strength, so cooling during the process is important, especially when manufacturing a contact wire that requires high strength. In general copper wire processing equipment, room temperature processing oil is applied to or immersed in a die, capstan, and copper wire for cooling. For example, Patent Document 4 discloses a method for immersion cooling and wire drawing of a general copper wire in processing oil. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-137551 [Patent Document 2] Japanese Patent Application Laid-Open No. 2007-56370 [Patent Document 3] Japanese Patent Application Laid-Open No. 2010-201478 [Patent Document 4] Japanese Patent Application Laid-Open No. 2008-290121 Summary of the Invention [Problem to be solved by the invention]

[0007] However, because contact wires have a large diameter, they generate a lot of heat during the wiredrawing process, and room-temperature processing oil cannot fully reduce the generated heat, raising concerns that this could result in a decrease in strength. Furthermore, because the same wiredrawing oil is used repeatedly in a single wiredrawing process, the temperature of the oil increases, potentially resulting in incomplete reduction of the processing heat. Furthermore, the processing oil used for contact wires has a high viscosity due to the wiredrawing load, making it unsuitable for cooling.

[0008] Therefore, an object of the present invention is to provide a method and apparatus for manufacturing a trolley wire that can produce a high-strength trolley wire while keeping costs down. [Means for solving the problem]

[0009] In order to solve the above-mentioned problems, the present invention provides a method for manufacturing a trolley wire made of a copper base material containing 0.25% by weight or more of tin, which includes a processing step in which the wire is drawn and grooved using a plurality of dies while being transported by a plurality of transport devices, and in which the wire drawing and groove processing are performed continuously while being cooled using a first cooling mechanism that sprays cooling water inside the transport devices, a second cooling mechanism that cools the dies by immersing or applying wire drawing oil, and a third cooling mechanism that applies an aqueous lubricant to the wire and collects the aqueous lubricant in a cover that houses the transport devices, thereby immersing the wire in the aqueous lubricant.

[0010] In addition, in order to solve the above-mentioned problems, the present invention provides a trolley wire manufacturing device comprising: a supply device for supplying wire made of a copper base material containing 0.25% or more by weight of tin; a plurality of transfer devices for transporting the wire; a plurality of dies for performing wire drawing and grooving on the wire; a first cooling mechanism for spraying cooling water inside the transfer devices; a second cooling mechanism for cooling the dies by immersing or applying wire drawing oil; and a third cooling mechanism for applying an aqueous lubricant to the wire and storing the aqueous lubricant in a cover that houses the transfer devices, thereby immersing the wire in the aqueous lubricant. [Effects of the Invention]

[0011] According to the trolley wire manufacturing method and manufacturing device of the present invention, it is possible to manufacture a high-strength trolley wire while suppressing costs. [Brief explanation of the drawings]

[0012] [Figure 1] 2 is a flowchart illustrating an example of steps in a method for manufacturing a trolley wire according to an embodiment of the present invention. [Figure 2] 1 is a schematic diagram showing a configuration example of a trolley wire manufacturing device according to an embodiment of the present invention. [Figure 3] 1(a) to 1(f) are cross-sectional views of a wire rod, a drawn wire material, a stripped material, a first grooved material, a second grooved material, and a trolley wire. [Figure 4] FIG. 3 is a cross-sectional view showing an example of a first cooling mechanism. [Figure 5] FIG. 4 is a cross-sectional view showing an example of a second cooling mechanism. [Figure 6] FIG. 10 is a cross-sectional view showing an example of a third cooling mechanism. DETAILED DESCRIPTION OF THE INVENTION

[0013] [Embodiment Mode] Fig. 1 is a flowchart showing an example of a method for manufacturing a trolley wire 100 according to an embodiment of the present invention. Fig. 2 is a schematic diagram showing an example of the configuration of a manufacturing apparatus 1 for the trolley wire 100 according to the present embodiment. Figs. 3(a) to 3(f) are cross-sectional views of a wire rod 11, a drawn wire material 12, a stripping material 13, a first grooved material 14, a second grooved material 15, and the finished trolley wire 100. Figs. 4 to 6 are cross-sectional views showing the configurations of first to third cooling mechanisms 6 to 8 of the manufacturing apparatus 1.

[0014] As shown in Fig. 3(f), the trolley wire 100 is formed with a pair of suspension grooves 101 for stringing the trolley wire 100 and a pair of holding grooves 102 for holding an optical fiber 90 as a detection wire for detecting when the wear amount of the trolley wire 100 reaches a predetermined value, which extend longitudinally over the entire length of the trolley wire 100. The trolley wire 100 is suspended above the track of the railway vehicle by metal fittings having claws that clamp the pair of suspension grooves 101. When the optical fiber 90 breaks, it is detected that the wear amount of the trolley wire 100 reaches a predetermined value.

[0015] The wire rod 11, the wire drawn material 12, the stripping material 13, the first grooved material 14, and the second grooved material 15 are linear bodies in the process of processing the trolley wire 100. In the following description, the wire rod 11, the wire drawn material 12, the stripping material 13, the first grooved material 14, and the second grooved material 15 are collectively referred to as wire material 10. The first grooved material 14 and the second grooved material 15 are respectively formed with suspension processing grooves 141, 151 that become the suspension grooves 101 of the trolley wire 100, and holding processing grooves 142, 152 that become the holding grooves 102 of the trolley wire 100.

[0016] As shown in Figure 1, the manufacturing method of the trolley wire 100 in this embodiment includes a wire drawing process (F1) in which a rough wire 11 is drawn into a circular shape to produce a drawn wire material 12, a skinning process (F2) in which a skinning process is performed to remove the copper oxide layer 121 on the surface of the drawn wire material 12 to produce a skinned material 13, a grooving process (F3) in which the skinned material 13 is grooved to sequentially produce a first grooved material 14 and a second grooved material 15, a finishing process (F4) in which the second grooved material 15 is finished to give it its final shape as the trolley wire 100, and a winding process (F5) in which the trolley wire 100 is wound onto a wire storage machine 4.

[0017] In this embodiment, a pair of suspension grooves 101 and holding grooves 102 are formed by two grooving processes on the wire 10. The first grooved material 14 is a linear body in a state in which the first grooving process has been performed, and the second grooved material 15 is a linear body in a state in which the second grooving process has been performed. The finishing process in the finishing step (F4) includes a process of accommodating the optical fibers 90 in the pair of holding grooves 152 of the second grooved material 15, respectively, and then closing the pair of holding grooves 152.

[0018] The wire drawing process (F1), the skinning process (F2), the groove forming process (F3), the finishing process (F4), and the winding process (F5) are carried out continuously, that is, as a series of processes without interrupting the flow of the wire rod 10 and the trolley wire 100 at each stage from when the rough wire 11 is unwound until the trolley wire 100 is wound onto the wire storage machine 4. Thereafter, the trolley wire 100 is rewound onto the winding drum 51 from the wire storage machine 4 and shipped.

[0019] As shown in Fig. 2, the manufacturing apparatus 1 includes a wire rod payout machine 2 that pays out a wire rod 11 wound in a coil shape, first to fifth processing machines 3A to 3E (hereinafter also referred to as "processing machines 3" when collectively referred to), a wire storage machine 4 that stores the trolley wire 100 produced by the first to fifth processing machines 3A to 3E, and a drum winding machine 5 that winds the trolley wire 100 paid out from the wire storage machine 4 onto a winding drum 51. The wire rod payout machine 2 is an example of a supply device of the present invention. The wire storage machine 4 is an example of a winding device of the present invention.

[0020] 4 to 6 are provided in at least one of the first to fifth processing machines 3A to 3E. The first to third cooling mechanisms 6 to 8 perform cooling so that the pre-processing temperature of the wire rod 10 immediately before each of the wire drawing, skinning, grooving, and finishing processes is 30°C or lower, and the post-processing temperature of the wire rod 10 immediately after each of these processes is 100°C or lower.

[0021] The wire rod payout machine 2 pays out the wire rod 11, which is produced by casting and hot-rolling a molten metal of pure copper or a copper alloy, from a coil 21 at a constant speed. The wire rod 11 is made of a copper base material containing 0.25% by weight or more of tin. Note that the copper base material may contain other additive elements (e.g., indium) in addition to tin as additive elements. In this case, the content of the additive elements, including tin and the other additive elements, may be, for example, 0.15% by weight or more and 0.8% by weight or less.

[0022] The first to fifth processing machines 3A to 3E each have dies 31A to 31E (hereinafter collectively referred to as "dies 31") for shaping the wire rod 10, and first to fifth capstans 32A to 32E (hereinafter collectively referred to as "capstans 32") for transporting the wire rod 10 to a subsequent process. The first to fifth capstans 32A to 32E are disposed adjacent to and downstream of the dies 31A to 31E in the traveling direction of the wire rod 10. The roughly drawn wire 11 is shaped by passing through the dies 31A to 31E of the first to fifth processing machines 3A to 3E in sequence, and its cross-sectional shape and size gradually become closer to those of the trolley wire 100. The capstan 32 is an example of a transport device of the present invention.

[0023] The manufacturing apparatus 1 uses a round-hole wire drawing die 31A (first processing machine 3A) to draw the rough wire 11 to produce a drawn wire material 12. The second processing machine 3B uses a stripping die 31B (second processing machine 3B) to strip the surface of the drawn wire material 12 to produce a stripped material 13. The third processing machine 3C and the fourth processing machine 3D use grooved dies 31C and 31D (third and fourth processing machines 3C and 3D) to groove the wire in two separate steps to produce a second grooved material 15. The fifth processing machine 3E uses a finishing die 31E (fifth processing machine 3E) to produce a final-shaped trolley wire 100. The second processing machine 3B, which performs the stripping process, is an example of a stripping device of the present invention. An optical fiber 90 is supplied to the fifth processing machine 3E from a detection wire feeder 9.

[0024] The manufacturing apparatus 1 includes a wire drawing payout machine 2, a die 31A (wire drawing die), a first capstan 32A, a die 31B (skinning die), a second capstan 32B, a die 31C (irregular hole die), a third capstan 32C, a die 31D (irregular hole die), a fourth capstan 32D, a die 31E (finishing die), a fifth capstan 32E, and a wire storage machine 4, which are arranged in series so that the wire rod 10 moves at a constant linear speed in the first to fifth processing machines 3A to 3E. Each capstan 32 applies a predetermined tension to the wire rod 10 while transporting it.

[0025] The wire storage machine 4 has a cylindrical winding body 41, and continuously winds the trolley wire 100 manufactured by the first to fifth processing machines 3A to 3E from its starting end to its terminal end onto the winding body 41. The drum winding machine 5 does not operate until the wire storage machine 4 winds up the terminal end of the trolley wire 100, and after the wire storage machine 4 winds up the terminal end of the trolley wire 100, it winds up the trolley wire 100 reeled out from the wire storage machine 4 onto a winding drum 51.

[0026] 4 is a cross-sectional view showing an example of a first cooling mechanism 6 for cooling the capstan 32. This first cooling mechanism 6 is provided in at least one of the first to fifth processing machines 3A to 3E. The capstan 32 becomes hot due to heat transferred from the shaped wire rod 10. For this reason, the first cooling mechanism 6 sprays cooling water 60 into the inside of the capstan 32 to suppress a temperature rise in the capstan 32 in at least one of the wire drawing process (F1), the skinning process (F2), the grooving process (F3), and the finishing process (F4).

[0027] The first cooling mechanism 6 includes a rotary joint 61 partially disposed inside the capstan 32, a cooling water tank 62 for storing cooling water 60, a cooling water device 63 for lowering the temperature of the cooling water 60 and supplying it to the cooling water tank 62, and a pump 64 for transporting the cooling water 60 in the cooling water tank 62 to the inside of the rotary joint 61 and spraying the cooling water 60 inside the capstan 32. In Fig. 4, 62a, 62b, 63a, and 63b are pipes for transporting the cooling water 60.

[0028] The rotary joint 61 has a pipe 611 that passes through the interior. A pump 64 transports cooling water 60 through the pipe 611 into the capstan 32 and sprays it. The cooling water 60 sprayed inside the capstan 32 cools the capstan 32. The cooling water 60 sprayed inside the capstan 32 flows inside the capstan 32, passes from inside the capstan 32 back through the interior of the rotary joint 61, and is collected in the cooling water tank 62. The cooling water device 63 sucks cooling water from the cooling water tank 62, cools it, and returns the cooled cooling water 60 to the cooling water tank 62.

[0029] 5 is a cross-sectional view showing an example of a second cooling mechanism 7 for cooling the die 31. The second cooling mechanism 7 is provided in at least one of the first to fifth processing machines 3A to 3E. The temperature of the die 31 rises due to processing heat generated when shaping the wire rod 10. Furthermore, in order to shape the wire rod 10 with a small load, it is necessary to supply wire drawing oil to the die 31. For this reason, the second cooling mechanism 7 cools the die 31 by immersing it in or applying wire drawing oil 70 in at least one of the wire drawing step (F1), the scalping step (F2), the grooving step (F3), and the finishing step (F4), thereby suppressing a temperature rise in the die 31.

[0030] The second cooling mechanism 7 has a die box 71 that houses a guide die 711 that guides the wire 10, a first die holder 712 that holds the guide die 711, and a second die holder 713 that holds the die 31. The die box 71 is filled with wire drawing oil 70 to the extent that at least a portion of the guide die 711, the first die holder 712, the die 31, and the second die holder 713 are immersed.

[0031] The second cooling mechanism 7 includes an oil tank 72 that collects the wiredrawing oil 70 in the die box 71, an oil filter 73 that is disposed on a supply pipe 72a of the oil tank 72 and that collects copper powder and other particles generated during processing, a pump 74, a heat exchanger 75, a cooling water device 76, and an oil supply nozzle 77 that supplies the wiredrawing oil 70 into the die box 71. The pump 74 pumps the wiredrawing oil 70 that has passed through the oil filter 73 to the heat exchanger 75. The cooling water device 76 supplies cooling water to the heat exchanger 75 to cool the wiredrawing oil 70. The heat exchanger 75 exchanges heat between the wiredrawing oil 70 and cooling water from the cooling water device 76. In FIG. 4, 72a, 72b, and 75a are pipes that transport the wiredrawing oil 70. 76a and 76b are pipes that transport cooling water between the heat exchanger 75 and the cooling water device 76.

[0032] The wire drawing oil 70 is sucked into the pump 74 from the oil tank 72 and discharged from the pump 74. After the temperature is lowered through the heat exchanger 75, the wire drawing oil 70 is supplied from the oil supply nozzle 77 to the die box 71 to cool the die 31. Instead of using the oil supply nozzle 77, the wire drawing oil 70 may be applied to the die 31 with a paintbrush or brush.

[0033] FIG. 6 is a cross-sectional view showing an example of a third cooling mechanism 8 that performs direct cooling at the capstan 32 and emulsion immersion cooling. The third cooling mechanism 8 is provided in at least one of the first to fifth processing machines 3A to 3E. The third cooling mechanism 8 applies emulsion 80 to the wire rod 10 in at least one of the wire drawing process (F1), the skinning process (F2), the grooving process (F3), and the finishing process (F4), and then accumulates the emulsion 80 in a capstan cover 81, thereby immersing the wire rod 10 in the emulsion 80. That is, in order to further cool the wire rod 10 whose processing heat has been alleviated by applying the emulsion 80, the third cooling mechanism 8 accumulates the emulsion 80 applied to the wire rod 10 from an emulsion nozzle 82, and immerses the wire rod 10 in the emulsion 80. Here, the emulsion 80 is an example of a water-based lubricant.

[0034] The third cooling mechanism 8 includes a capstan cover 81 that houses the capstan 32, an emulsion nozzle 82 that applies emulsion 80 to the wire 10, an emulsion tank 83 that houses the emulsion 80, a pump 84 that pressurizes the emulsion 80 in the emulsion tank 83, a heat exchanger 85, and a cooling water device 86 that supplies cooling water to the heat exchanger 85. The heat exchanger 85 exchanges heat between the emulsion 80 and cooling water from the cooling water device 86. In FIG. 5, 83a, 83b, and 85a are pipes that transport the emulsion 80. 86a and 86b are pipes that transport cooling water between the heat exchanger 85 and the cooling water device 86.

[0035] The emulsion 80 applied to the wire rod 10 is stored in a depth of about 20 cm inside a capstan cover 81, and the wire rod 10 is further cooled by being immersed in the emulsion 80. The emulsion 80 stored in the capstan cover 81 is collected in an emulsion tank 83. The collected emulsion 80 has its temperature lowered by a heat exchanger 85, and is then applied again to the wire rod 10 by an emulsion nozzle 82. The emulsion 80 applied to the wire rod 10 is blown away by a blower. This prevents the emulsion 80 from being mixed into the wire drawing oil 70.

[0036] (Variation) In the above embodiment, the wire drawing process is performed in one step, but the wire drawing process may be performed in multiple steps. In the above embodiment, the grooving process is performed in two steps, but the number of times the grooving process is performed may be one step or three or more steps. In the first cooling mechanism 6, an emulsion may be used instead of the cooling water 60, and the emulsion may be collected in an emulsion tank. In the first cooling mechanism 6, another refrigerant such as a gas may be used instead of the cooling water 60.

[0037] (Example) In order to verify the effect of increasing the strength according to this embodiment, the tensile strength of the contact wires was investigated using a single-head wire drawing machine, a continuous wire drawing machine without cooling strengthening, and a continuous wire drawing machine with cooling strengthening corresponding to the above embodiment. The target contact wires (samples) were 110 mm2 in cross section with 0.3 wt% tin added. 2 and a 110mm cross-sectional area contact wire (Cu-Sn contact wire 110SQ) containing 0.3% by weight of tin and 0.1% by weight of indium. 2 The contact wire (Cu-Sn-In contact wire 110SQ) and the contact wire with 170mm cross section containing 0.3% by weight of tin and 0.1% by weight of indium were used. 2 The contact wire used was a Cu-Sn-In contact wire 170SQ. The tensile strength and elongation of the contact wire were measured in accordance with JIS C3002 (Testing methods for electrical copper wires and aluminum wires). The tensile load, tensile strength and elongation of the contact wire are shown in Table 1. The tensile strength is the value obtained by dividing the tensile load by the nominal cross-sectional area.

[0038] [Table 1]

[0039] As shown in Table 1, the single-head wire drawing machine and the continuous wire drawing machine without cooling reinforcement have almost the same tensile load and tensile strength of the contact wire, and it can be seen that the continuous wire drawing machine without cooling reinforcement has lower tensile load and tensile strength of the contact wire depending on the product type. On the other hand, it can be seen that the continuous wire drawing machine with cooling reinforcement has a tensile strength that is about 3 to 4% higher than that of the single-head wire drawing machine and about 6 to 7% higher than that of the continuous wire drawing machine without cooling reinforcement, achieving a tensile strength of 430 MPa or more. Therefore, it can be seen that the strength of the contact wire can be increased by performing the cooling reinforcement according to the above embodiment. Furthermore, while the elongation of general metal materials decreases as the tensile strength increases, it can be seen that the elongation of the contact wire manufactured in this example maintains the same level of elongation as that of the single-head wire drawing machine.

[0040] (Effects of the embodiment) As described above, according to this embodiment, the wire rod 10 can be supplied to each die 31 in a sufficiently cooled state during shaping of the wire rod 10, and the temperature of the wire rod 10 can be kept low during and after processing, thereby making it possible to manufacture a high-strength trolley wire 100. Furthermore, since the strength of the trolley wire 100 and the lifespan of the trolley wire 100 are proportional to each other, by increasing the strength of the trolley wire 100, it is possible to extend the lifespan of the trolley wire 100 while keeping costs down.

[0041] (Summary of the embodiment) Next, the technical ideas grasped from the above-described embodiments will be described by using the reference numerals and the like in the embodiments. However, the reference numerals in the following description do not limit the components in the claims to the members and the like specifically shown in the embodiments.

[0042] [1] A method for manufacturing a trolley wire (100) made of a copper base material containing 0.25% by weight or more of tin, comprising a processing step of performing wire drawing and grooving using a plurality of dies (31) while transferring the wire (10) using a plurality of transfer devices (capstans 32), and the wire drawing and grooving are continuously performed while cooling using a first cooling mechanism (6) that sprays cooling water (60) inside the transfer devices (32), a second cooling mechanism (7) that cools the dies by immersing or applying wire drawing oil (70), and a third cooling mechanism (8) that applies an aqueous lubricant (emulsion 80) to the wire (10) and collects the aqueous lubricant (80) in a cover (capstan cover 81) that houses the transfer devices (32), thereby immersing the wire (10) in the aqueous lubricant (80).

[0043] [2] The method for manufacturing a trolley wire according to the above [1], wherein the cooling is performed so that the pre-processing temperature of the wire (10) before the wire drawing and the groove forming is 30°C or less, and the post-processing temperature of the wire (10) after the wire drawing and the groove forming is 100°C or less.

[0044] [3] The method for manufacturing a trolley wire according to the above [1], wherein the groove forming process is a process for forming grooves (141, 142, 151, 152) in the wire (10) using a special hole die (31C, 31D).

[0045] [4] The method for manufacturing a trolley wire according to the above [1], wherein the processing step further includes a skinning process for skinning the surface of the wire (10), and in the processing step, the wire drawing process, the skinning process, and the grooving process are performed successively while cooling is performed by the first to third cooling mechanisms (6 to 8).

[0046] [5] The method for manufacturing a trolley wire according to any one of [1] to [4] above, wherein the tensile strength of the trolley wire (100) processed in the processing step is 430 MPa or more.

[0047] [6] A trolley wire manufacturing apparatus (1) comprising: a supply device (rough wire drawing payout machine 2) for supplying a wire (10) made of a copper base material containing 0.25% by weight or more of tin; a plurality of transfer devices (32) for transferring the wire (10); a plurality of dies (31) for drawing and grooving the wire (10); a first cooling mechanism (6) for spraying cooling water (60) into the transfer device (32); a second cooling mechanism (7) for cooling the dies (31) by immersing or applying wire drawing oil (70); and a third cooling mechanism (8) for applying an aqueous lubricant (80) to the wire (10) and storing the aqueous lubricant (80) in a cover (81) that houses the transfer device (32), thereby immersing the wire (10) in the aqueous lubricant (80).

[0048] [7] The trolley wire manufacturing apparatus (1) described in [6] above, further comprising a skinning device (second processing machine 3B) that skins the surface of the wire (10) that has been subjected to the wire drawing process.

[0049] Although the embodiments of the present invention have been described above, the invention according to the claims is not limited to the embodiments described above. It should be noted that not all of the combinations of features described in the embodiments are necessarily essential to the means for solving the problems of the invention. [Explanation of symbols]

[0050] 1...Manufacturing equipment 10...Wire rod 100...Contact wire 2...Wire drawing payout machine (supply device) 3...Processing machine 31, 31A~31E...Dies 32... Capstan (transport device) 32A to 32E... First to fifth capstans 3A to 3E... First to fifth processing machines 6... First cooling mechanism 60...cooling water 7...second cooling mechanism 70...Wire drawing oil 8...Third cooling mechanism 80...Emulsion (water-based lubricant) 81...Capstan cover (cover)

Claims

1. A method for manufacturing a trolley wire made of a copper base material containing 0.25% by weight or more of tin, a processing step in which wire drawing and grooving are performed using a plurality of dies while the wire is being transferred using a plurality of transfer devices; The wire drawing and the grooving are successively performed while cooling is performed by a first cooling mechanism that sprays cooling water into the inside of the transfer device, a second cooling mechanism that cools the die by immersing or applying wire drawing oil, and a third cooling mechanism that applies an aqueous lubricant to the wire and stores the aqueous lubricant in a cover that houses the transfer device, thereby immersing the wire in the aqueous lubricant. Manufacturing method of contact wire.

2. The cooling is performed so that the pre-processing temperature of the wire rod before the wiredrawing and the grooving is 30°C or less, and the post-processing temperature of the wire rod after the wiredrawing and the grooving is 100°C or less. The method for manufacturing a trolley wire according to claim 1.

3. The grooving process is a process of forming a groove in the wire using a special hole die. The method for manufacturing a trolley wire according to claim 1.

4. The processing step further includes a skinning process for skinning the surface of the wire, In the processing step, the wire drawing, the skinning, and the grooving are successively performed while cooling is performed by the first to third cooling mechanisms. The method for manufacturing a trolley wire according to claim 1.

5. The tensile strength of the trolley wire processed in the processing step is 430 MPa or more. A method for manufacturing a trolley wire according to any one of claims 1 to 4.

6. a supply device for supplying a wire made of a copper base material containing 0.25 wt % or more of tin; a plurality of transfer devices for transferring the wire; a plurality of dies for drawing and grooving the wire; a first cooling mechanism that sprays cooling water into the inside of the transfer device; a second cooling mechanism that cools the die by immersing it in or applying wire drawing oil; a third cooling mechanism that applies a water-based lubricant to the wire and stores the water-based lubricant in a cover that houses the transfer device, thereby immersing the wire in the water-based lubricant; A contact wire manufacturing device equipped with the above.

7. The wire drawing method further includes a stripping device for stripping the surface of the wire that has been subjected to the wire drawing process.

7. The apparatus for manufacturing a trolley wire according to claim 6.

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