Trolley wire dice

Abstract

To provide a trolley wire dice which is used for the wire drawing of a trolley wire comprising an abrasion detection line hole, suppresses the breakage of a protrusion for forming the abrasion detection line hole, and suppresses manufacturing costs.SOLUTION: A trolley wire dice 2a used for the wire drawing of a body 10 of a trolley wire 1 having an abrasion detection line hole 14, comprises: first parts 20a, 20b made of a first metal material; and a second part 21 made of a second metal material, including a protrusion 23 protruding to the inside of a dice hole 22 to form a groove 140 processed in the abrasion detection line hole 14 into a raw material of the body 10 of the trolley wire 1, wherein the second metal material has a higher Rockwell hardness than that of the first metal material.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a die for trolley wire used for wire drawing of a trolley wire incorporating a wear detection wire.

Background Art

[0002] Conventionally, a technique for processing a trolley wire by wire drawing using a die has been known (see, for example, Patent Document 1). Patent Document 1 discloses that wire drawing using a die is preferable for processing long products such as trolley wires in terms of ease of handling, excellent dimensional stability, etc.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Generally, a die for wire drawing a trolley wire having a hole for a wear detection wire for accommodating the wear detection wire is provided with a protrusion for forming the hole for the wear detection wire. In such a die, the mechanical strength of the protrusion portion is relatively low and it is easily damaged by the force received during wire drawing of the trolley wire.

[0005] For this reason, a die for wire drawing a trolley wire having a hole for a wear detection wire is preferably made of a material having excellent hardness such as cemented carbide in order to suppress breakage. However, since such a material is expensive, there is a problem that the manufacturing cost of the die increases significantly.

[0006] An object of the present invention is to provide a die for trolley wire used for wire drawing of a trolley wire provided with a hole for a wear detection wire, in which breakage of the protrusion for forming the hole for the wear detection wire is suppressed and the manufacturing cost is suppressed.

Means for Solving the Problems

[0007] The present invention is a trolley wire die used for wire drawing of the main body of a trolley wire having a wear detection wire hole for accommodating a wear detection wire, comprising a first portion made of a first metal material, and a protrusion for forming a groove processed in the wear detection wire hole, which protrudes toward the inside of the die hole, in the material of the main body of the trolley wire, and a second portion made of a second metal material, wherein the second metal material has a higher Rockwell hardness than the first metal material, and provides a trolley wire die.

Advantages of the Invention

[0008] According to the present invention, there is provided a trolley wire die used for wire drawing of a trolley wire provided with a wear detection wire hole, which can suppress breakage of a protrusion for forming the wear detection wire hole and can suppress the manufacturing cost.

Brief Description of the Drawings

[0009]

Figure 1

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Figure 9

DETAILED DESCRIPTION OF THE INVENTION

[0010] The trolley wire die according to the embodiment of the present invention is a trolley wire die used for wire drawing of the main body of a trolley wire having a wear detection wire hole for accommodating a wear detection wire. Hereinafter, the details of the trolley wire die according to the embodiment of the present invention will be described.

[0011] (Structure of trolley wire) FIG. 1 is a cross-sectional view in the radial direction of a trolley wire 1 which is an example of a trolley wire formed by wire drawing using the trolley wire die according to the embodiment of the present invention. The trolley wire 1 has a trolley wire main body 10 having two wear detection wire holes 14 inside, and two optical fibers 16 as wear detection wires accommodated in the two wear detection wire holes 14. The trolley wire 1 has a length corresponding to the distance of the overhead line section of the line, for example, a length of 500 m or more and 1850 m or less.

[0012] The trolley wire main body 10 of the trolley wire 1 is a deformed round trolley wire, and has V-shaped ear grooves 13 provided on both sides, a large arc surface 12 below the ear grooves 13, and a linear wear detection wire hole 14 provided along the longitudinal direction of the trolley wire main body 10 at a position at a predetermined distance from the bottom of the large arc surface 12. The trolley wire main body 10 corresponds to a grooved hard copper trolley wire defined in JIS E2101 and IEC 62917.

[0013] The nominal cross-sectional area of the trolley wire main body 10 is 170 mm 2 (170 SQ) or less. Here, the nominal cross-sectional area is 170 mm 2That is, it is assumed that the calculation cross-sectional area is approximately 170 mm when the hole 14 for the wear detection line is not provided 2 (for example, 169.4 mm 2 or more and 172.2 mm 2 or less).

[0014] The trolley wire body 10 is mainly composed of a copper alloy, for example, a Cu - Sn - In - based alloy or a Cu - Sn - based alloy.

[0015] When power is supplied to the train via the trolley wire 1, the bottom of the large arc surface 12 of the trolley wire body 10 comes into contact with the current collection device of the train such as a pantograph. Therefore, due to the sliding of the current collection device, the trolley wire body 10 wears from the bottom of the large arc surface 12. When the wear of the trolley wire body 10 progresses and the optical fiber 16 breaks, the disconnection detection system operates, and it is detected that the trolley wire body 10 has worn to near the usage limit.

[0016] In the trolley wire body 10, a total of two holes 14 for the wear detection line are provided, one on each side of the center line 15 of the trolley wire body 10, and one optical fiber 16 is accommodated in each of these two holes 14 for the wear detection line. By using two optical fibers 16, wear can be detected even when uneven wear occurs.

[0017] The diameter of the optical fiber 16 is, for example, 0.9 mm or more and 1.1 mm or less. The optical fiber 16 with a diameter smaller than 1.1 mm can be obtained, for example, by thinning the outer coating of an optical fiber with a diameter of 1.1 mm that has been generally used in the past. Note that instead of the optical fiber 16, a wear detection line other than the optical fiber 16 such as an insulated wire may be used.

[0018] (Drawing of the trolley wire) The trolley wire 1 is processed to form the trolley wire body 10 by drawing using a die for the trolley wire, and in the process, the optical fiber 16 is accommodated in the hole 14 for the wear detection line of the trolley wire body 10. Hereinafter, the linear metal that is the material of the trolley wire body 10 processed by drawing to form the trolley wire body 10 is called the metal wire 100.

[0019] FIG. 2 is a schematic diagram showing a state where a metal wire 100 is drawn using a die 2a for trolley wire. As shown in FIG. 2, when the metal wire 100 is inserted into the die hole 22 from the inlet side S1 (die inlet) of the die 2a for trolley wire and pulled out from the outlet side S2 (die outlet) of the die 2a for trolley wire, the metal wire 100 is processed into a shape corresponding to the shape of the die hole 22. The cross-sectional shape of the metal wire 100 drawn from the die 2a for trolley wire becomes the same as the shape of the die hole 22 on the outlet side S2 of the die 2a for trolley wire.

[0020] FIGS. 3(a) to (e) are diagrams showing examples of changes in the cross-sectional shape of the metal wire 100 during the wire drawing process. The metal wires 100 in the states shown in FIGS. 3(a) to (d) are respectively referred to as metal wires 100a to 100d. The metal wire 100 in the state shown in FIG. 3(e) corresponds to the trolley wire main body 10. Hereinafter, an example of the flow of the wire drawing process will be described with reference to FIGS. 3(a) to (e).

[0021] The metal wire 100a shown in FIG. 3(a) is a metal wire 100 in a state where the cross-section in the radial direction is circular. First, the metal wire 100a is drawn using a wire drawing die to reduce the diameter, and the metal wire 100b shown in FIG. 3(b) is obtained.

[0022] Next, by passing the metal wire 100b through a skin removal die, the outermost layer 101 is removed, and the metal wire 100c with improved surface smoothness shown in FIG. 3(c) is obtained.

[0023] Next, the metal wire 100c is drawn using the die 2a for trolley wire, which is a special-shaped wire drawing die, to obtain the metal wire 100d shown in FIG. 3(d). The metal wire 100d corresponds to the trolley wire main body 10 before accommodating the optical fiber 16 and has a groove 140 for forming the hole 14 for the wear detection wire. In this step, while reducing the diameter of the metal wire 100, the cross-sectional shape is changed.

[0024] Next, by drawing the metal wire 100d using the profiled drawing die 3 described later, the groove 140 is processed into the wear detection wire hole 14, and the trolley wire body 10 shown in FIG. 3(e) is obtained. In this process, before passing the metal wire 100 through the profiled drawing die 3, the optical fiber 16 is disposed in the groove 140 of the metal wire 100d. Thereby, when the opening of the groove 140 is closed by drawing using the profiled drawing die 3, the wear detection wire hole 14 containing the optical fiber 16 is formed.

[0025] FIGS. 4(a) and 4(b) are cross-sectional views in the radial direction of the metal wire 100d and the trolley wire body 10, respectively. FIGS. 5(a) and 5(b) are schematic views showing the shapes of the die holes 22 on the outlet side S2 of the trolley wire die 2a for processing the metal wire 100c into the metal wire 100d and the die holes 30 on the outlet side of the profiled drawing die 3 for processing the metal wire 100d into the trolley wire body 10.

[0026] The shape of the die hole 22 on the outlet side S2 of the trolley wire die 2a corresponds to the cross-sectional shape in the radial direction of the metal wire 100d. Also, the shape of the die hole 30 on the outlet side of the profiled drawing die 3 corresponds to the cross-sectional shape in the radial direction of the trolley wire body 10.

[0027] For example, the shapes on the die outlet sides of the portion 24 of the die hole 22 and the portion 31 of the die hole 30 correspond to the shape of the ear groove 13 of the metal wire 100d and the trolley wire body 10. Also, the shape on the die outlet side of the portion 32 of the die hole 30 corresponds to the shape of the large arc surface 12 of the trolley wire body 10.

[0028] Also, the height of the die hole 30 on the outlet side of the profiled drawing die 3 is equal to the height of the trolley wire body 10 with a nominal cross-sectional area of 170 mm 2 and is approximately 15.49 mm (for example, 15.34 mm or more and 15.64 mm or less).

[0029] The protrusion 23 that protrudes toward the inside of the die hole 22 of the trolley wire die 2a is for forming the groove 140 of the metal wire 100d. The protrusion 23 is, for example, a linear protrusion 23 provided on a part of the outlet side S2 of the trolley wire die 2a, and its height h2 (the maximum value of the height from the base to the apex of the protrusion 23) and width W increase from the inlet side S1 toward the outlet side S2. The shape of the protrusion 23 on the outlet side S2 of the trolley wire die 2a corresponds to the cross-sectional shape of the groove 140. The edge 141 of the opening of the groove 140 formed by wire drawing using the trolley wire die 2a is closed by wire drawing using the profiled wire drawing die 3, thereby forming the wear detection wire hole 14. The height h1 of the protrusion 23 from the bottom of the die hole 22 at the outlet side S2 (die outlet) of the trolley wire die 2a is, for example, 8.95 mm or less.

[0030] When the protrusion 23 is damaged, the trolley wire die 2a becomes unusable. Specifically, during die maintenance, if fine scratches are confirmed, they can be repaired by polishing. However, if damage that cannot be repaired, such as breakage of the protrusion 23, is confirmed, the trolley wire die 2a is discarded.

[0031] (Structure of trolley wire die) FIG. 6 is a perspective view of a trolley wire die 2a according to an embodiment of the present invention. The trolley wire die 2a is a trolley wire die used for wire drawing of a trolley wire body 10 having a wear detection wire hole 14 for accommodating a wear detection wire such as an optical fiber 16, and includes first portions 20a, 20b made of a first metal material, and a protrusion 23 for forming a groove 140 processed in the wear detection wire hole 14 and protruding toward the inside of the die hole 22 in the metal wire 100c which is the material of the trolley wire body 10, and a second portion 21 made of a second metal material.

[0032] The second metal material, which is the material of the second portion 21, has a higher Rockwell hardness than the first metal material, which is the material of the first portions 20a and 20b, and can effectively suppress the breakage of the protrusion 23 during the wire drawing of the metal wire 100c. For example, the first metal material is alloy tool steel that has conventionally been generally used as the material of a wire drawing die, and the second metal material is cemented carbide such as WC-Co alloy, which has a higher hardness than alloy tool steel. When cemented carbide is used as the second metal material, the trolley wire die 2a can withstand multiple wire drawings of the metal wire 100c.

[0033] To more effectively suppress the breakage of the protrusion 23, the second metal material, which is the material of the second portion 21, preferably has a Rockwell hardness of 85 HRA or more and a fracture toughness value of 15 MPa / m 1 / 2 or more.

[0034] The trolley wire die 2a includes a first portion 20a that is the first layer, a second portion 21 that is the second layer above the first portion 20a, and a first portion 20b that is the third layer above the second portion 21.

[0035] In the trolley wire die 2a, the second portion 21 including the protrusion 23 is made of a relatively expensive second metal material, and the first portions 20a and 20b, which are the other portions, are made of a first metal material that is less expensive than the second metal material. Therefore, the manufacturing cost can be suppressed as compared with the case where the entire die is made of the second metal material.

[0036] The trolley wire die 2a can be formed, for example, by 3D printing. For this 3D printing, known 3D printers such as the PBF method in which a laser or an electron beam is irradiated onto spread metal powder and melted and fixed layer by layer for lamination, the DED method in which a laser or the like is irradiated onto metal powder or a metal wire ejected from a nozzle and melted and fixed layer by layer for lamination, and the MEX method in which a kneaded mixture of metal powder and a resin binder is melted and extruded from a nozzle, laminated, and then degreased and sintered can be used.

[0037] During 3D printing, by switching the material between the metal powder and the metal wire between the first metal material and the second metal material, the first parts 20a, 20b and the second part 21 can be integrally and continuously formed.

[0038] Also, the trolley wire die 2a can also be formed by joining the individually formed first parts 20a, 20b and the second part 21. In this case, first, the powder of the first metal material is filled into the molds of the first part 20a and the first part 20b respectively and sintered to form the mold of the first part 20a and the first part 20b. Similarly, the powder of the second metal material is filled into the mold of the second part 21 and sintered to form the second part 21. Then, the first part 20a and the second part 21, and the second part 21 and the first part 20b are joined by diffusion bonding or the like.

[0039] This diffusion bonding is, for example, a bonding method defined in JIS z 3001. The surfaces of the first part 20a and the second part 21, and the second part 21 and the first part 20b to be joined are brought into close contact, pressurized while heating, and a metal bond is generated between the bonding surfaces to join them.

[0040] Also, a die case that covers the outside of the trolley wire die 2a with the die hole 22 exposed may be used. By using the die case, the separation of the first parts 20a, 20b and the second part 21 can be more effectively suppressed.

[0041] FIG. 7 is a perspective view of a trolley wire die 2b which is a modified example of the trolley wire die 2a. In the trolley wire die 2b, the entire die hole 22 is included in the second part 21 made of the second metal material, and the periphery of the second part 21 in the planar direction of the trolley wire die 2b is surrounded by the first part 20 made of the first metal material.

[0042] In the trolley wire die 2b, similar to the trolley wire die 2a, since the second metal material, which is the material of the second portion 21 including the protrusion 23, has a higher Rockwell hardness than the first metal material, which is the material of the first portion 20, breakage of the protrusion 23 during wire drawing of the metal wire 100c can be effectively suppressed. Further, since the second portion 21 including the protrusion 23 is made of a relatively expensive second metal material, and the first portion 20, which is the other portion, is made of a first metal material that is less expensive than the second metal material, the manufacturing cost can be suppressed as compared with the case where the entire die is made of the second metal material.

[0043] To prevent the second portion 21 from rotating inside the first portion 20, the contour of the planar shape of the second portion 21 preferably has a shape other than a perfect circle. In the example shown in FIG. 7, the contour of the planar shape of the second portion 21 is an ellipse.

[0044] FIGS. 8(a) and 8(b) are cross-sectional views showing an example of the cross-sectional shape in the thickness direction (a direction parallel to the penetrating direction of the die hole 22) of the trolley wire die 2b when cut along the cutting line VIII-VIII shown in FIG. 7. In FIGS. 8(a) and 8(b), illustration of the portion 24 on the inner surface of the die hole 22 and the protrusion 23 is omitted.

[0045] In the example shown in FIG. 8(a), the second portion 21 has an inclination on the side surface such that the outer diameter in the planar direction (a direction perpendicular to the penetrating direction of the die hole 22) decreases from the inlet side S1 toward the outlet side S2, and the first portion 20 has a shape that matches it.

[0046] Further, in the example shown in FIG. 8(b), the second portion 21 has a step on the side surface such that the outer diameter in the planar direction at the inlet side S1 is larger than the outer diameter in the planar direction at the outlet side S2, and the first portion 20 has a shape that matches it.

[0047] When the second part 21 and the first part 20 have the shapes as shown in FIGS. 8(a) and 8(b), separation between the first part 20 and the second part 21 can be effectively prevented when an external force acting from the inlet side S1 toward the outlet side S2 is applied to the second part 21 during wire drawing of the metal wire 100c.

[0048] Similar to the trolley wire die 2a, the trolley wire die 2b can be formed, for example, by 3D printing. Also, the first part 20 and the second part 21 may be formed separately and used in combination. When the second part 21 and the first part 20 have the shapes as shown in FIGS. 8(a) and 8(b), the separately formed first part 20 and second part 21 can also be diffusion bonded.

[0049] Also, a die case that covers the outside of the trolley wire die 2b with the die hole 22 exposed may be used. By using the die case, separation between the first part 20 and the second part 21 can be more effectively suppressed.

[0050] FIG. 9 is a perspective view of a trolley wire die 2c, which is another modification of the trolley wire die 2a. In the trolley wire die 2c, the first parts 20a, 20b and the second part 21 are joined by a joint.

[0051] In the example shown in FIG. 9, a joint that fits the concave portion 200 of the first parts 20a, 20b and the convex portion 210 of the second part 21 is used. The structure of the joint is not limited to this, and for example, a joint that fits a concave portion of the second part 21 and convex portions of the first parts 20a, 20b may be used.

[0052] In particular, joints such as dovetail joints and sickle joints in which the concave portion 200 and the convex portion 210 have constrictions are preferable because they are excellent in resistance to external forces in the tensile direction. In the example shown in FIG. 9, the first part 20a and the second part 21 laminated thereon, and the second part 21 and the first part 20b laminated thereon are joined by dovetail joints, respectively.

[0053] Also, as illustrated in FIG. 9, it is preferable that a joint is provided in a direction that can effectively prevent the separation between the first portion 20 and the second portion 21 when an external force acting from the inlet side S1 toward the outlet side S2 is applied to the second portion 21 during the wire drawing of the metal wire 100c. In FIG. 9, the concave portions 200 of the first portions 20a and 20b constituting the joint and the convex portion 210 of the second portion 21 extend along a direction perpendicular to the penetrating direction of the die hole 22 and parallel to the interface between the first portions 20a and 20b and the second portion 21 (the left-right direction in FIG. 9).

[0054] In the trolley wire die 2c, similar to the trolley wire die 2a, since the second metal material, which is the material of the second portion 21 including the protrusion 23, has a higher Rockwell hardness than the first metal material, which is the material of the first portions 20a and 20b, the breakage of the protrusion 23 during the wire drawing of the metal wire 100c can be effectively suppressed. Further, since the second portion 21 including the protrusion 23 is made of a relatively expensive second metal material and the first portions 20a and 20b, which are the other portions, are made of a first metal material that is less expensive than the second metal material, the manufacturing cost can be suppressed as compared with the case where the entire die is made of the second metal material.

[0055] Similar to the trolley wire die 2a, the trolley wire die 2c can be formed, for example, by 3D printing. Further, after the first portion 20a, the first portion 20b, and the second portion 21 are formed individually, they may be joined by a joint. Further, after the individually formed first portion 20a, first portion 20b, and second portion 21 are joined by a joint, they may be diffusion-joined.

[0056] Also, a die case that covers the outside of the trolley wire die 2c with the die hole 22 exposed may be used. By using the die case, the separation between the first portions 20a and 20b and the second portion 21 can be more effectively suppressed.

[0057] (Effects of the Embodiment) According to the trolley wire dies 2a, 2b, and 2c according to the above-described embodiment of the present invention, since the second portion 21 including the protrusion 23 is formed of a metal material having a high hardness and the other portions are formed of an inexpensive metal material, the manufacturing cost can be suppressed while suppressing breakage of the protrusion 23 during wire drawing of the metal wire 100c.

[0058] (Summary of the embodiment) Next, the technical idea grasped from the above-described embodiment will be described by referring to the reference numerals and the like in the embodiment. However, each reference numeral and the like in the following description are not limited to the members and the like that specifically show the components in the claims in the embodiment.

[0059] [1] A trolley wire die used for wire drawing of the main body 10 of a trolley wire 1 having a wear detection wire hole 14 for accommodating a wear detection wire (16), the die comprising a first portion (20, 20a, 20b) made of a first metal material, and a protrusion (23) for forming a groove (140) processed in the wear detection wire hole (14) and protruding toward the inside of the die hole (22) in the material of the main body (10) of the trolley wire (1), and a second portion (21) made of a second metal material, wherein the second metal material has a higher Rockwell hardness than the first metal material, the trolley wire die (2a, 2b, 2c).

[0060] [2] The trolley wire die (2a) according to [1] above, including a first layer which is a part (20a) of the first portion, a second layer which is the second portion (21) above the first layer, and a third layer which is a part (20b) of the first portion above the second layer.

[0061] [3] The trolley wire die (2b) according to [1] above, wherein the entire die hole (22) is included in the second portion (21), and the periphery of the second portion (21) in the plane direction of the trolley wire die (2b) is surrounded by the first portion (20).

[0062] [4] The trolley wire die (2c) according to [1] above, wherein the first part (20a, 20b) and the second part (21) are joined by a joint.

[0063] [5] The trolley wire die (2a, 2b, 2c) according to any one of [1] to [4] above, wherein the first metal material is alloy tool steel and the second metal material is cemented carbide.

[0064] As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist of the invention. Also, the components of the above embodiments can be arbitrarily combined without departing from the gist of the invention.

[0065] Also, the above-described embodiments do not limit the invention according to the claims. It should also be noted that not all combinations of the features described in the embodiments are essential means for solving the problems of the invention.

Explanation of Reference Numerals

[0066] 1 trolley wire 10 trolley wire body 14 holes for wear detection wire 140 groove 16 optical fiber 2a, 2b, 2c trolley wire dies 20, 20a, 20b first part 200 recess 21 second part 210 protrusion 22 die hole 23 protrusion

Claims

1. A trolley wire die used for wire drawing of the body of a trolley wire having a wear detection wire hole for accommodating a wear detection wire, comprising: a first part made of a first metal material; a second part made of a second metal material, including a protrusion for forming a groove processed in the wear detection wire hole, which protrudes toward the inside of the die hole, in the material of the body of the trolley wire; and is provided with; wherein the second metal material has a higher Rockwell hardness than the first metal material; a trolley wire die.

2. including a first layer which is a part of the first part, a second layer which is the second part on the first layer, and a third layer which is a part of the first part on the second layer; the trolley wire die according to Claim 1.

3. the entire die hole is included in the second part; the periphery of the second part in the plane direction of the trolley wire die is surrounded by the first part; the trolley wire die according to Claim 1.

4. the first part and the second part are joined by a joint; the trolley wire die according to Claim 1.

5. the first metal material is alloy tool steel; the second metal material is cemented carbide; the trolley wire die according to any one of Claims 1 to 4.

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