Method for manufacturing a rod and anode device

Abstract

Provided is a rod production method in which a rod is plated, said method comprising: a step for disposing a rod inside a first cylinder that is formed by arranging a plurality of rod-shaped members in a ring shape; and a step for plating the rod by flowing a plating solution in one direction in a first flow path between the first cylinder and the rod.

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a rod and an anode device. This application claims priority based on Japanese Patent Application No. 2021-170813 filed in Japan on October 19, 2021, and incorporates the content herein by reference.

Background Art

[0002] There is an anode having a conductive outer cylinder portion and a platinum inner cylinder portion welded so as to be in contact with the inner surface of the outer cylinder portion (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a method for manufacturing a rod for plating the rod, it is desired to improve the durability of the apparatus used.

[0005] Therefore, an object of the present invention is to provide a method for manufacturing a rod and an anode device capable of improving the durability of the apparatus used.

Means for Solving the Problems

[0006] To achieve the above object, the present invention employs the following aspects. That is, a method for manufacturing a rod according to one aspect of the present invention is a method for manufacturing a rod for plating the rod, the method including: disposing the rod in a first cylinder formed by arranging a plurality of rod-shaped members in a ring shape; and flowing a plating solution in a first flow path between the first cylinder and the rod in one direction to plate the rod.

[0007] Further, the anode device according to one aspect of the present invention has a plurality of rod-shaped members that are arranged in a ring to form a first cylindrical body, thereby forming a space through which the plating solution flows between the rod-shaped members and the rod disposed inside the first cylindrical body, and a positive voltage is applied thereto.

Effects of the Invention

[0008] According to each of the above aspects of the present invention, the durability of the device used can be improved.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0010] One embodiment of the present invention will be described below with reference to the drawings.

[0011] First, a cylinder device 11 including a rod 10 manufactured by the manufacturing method of the present embodiment will be described with reference to FIG. 1. The cylinder device 11 shown in FIG. 1 is a shock absorber used in a suspension device of a vehicle such as an automobile or a railway vehicle. Specifically, the cylinder device 11 is a shock absorber used in a suspension device of an automobile. The cylinder device 11 includes a cylinder 17 having an inner cylinder 15 and an outer cylinder 16. The inner cylinder 15 is cylindrical. The outer cylinder 16 is a bottomed cylindrical shape. The outer cylinder 16 is provided on the outer peripheral side of the inner cylinder 15 so as to cover the outer peripheral portion of the inner cylinder 15. A reservoir chamber 18 is formed between the outer cylinder 16 and the inner cylinder 15.

[0012] The outer cylinder 16 has a body portion 21, a bottom portion 22, and an opening 23. The body portion 21 is cylindrical. The bottom portion 22 closes one end portion side in the axial direction of the body portion 21. The opening 23 is provided on the side opposite to the bottom portion 22 of the body portion 21. The inner cylinder 15 is an integrally formed product made of a single metal member. The cylinder device 11 has a valve body 25 and a rod guide 26. The valve body 25 is annular and is provided at one end portion in the axial direction of the inner cylinder 15. The valve body 25 is placed on the bottom portion 22 of the outer cylinder 16. The rod guide 26 is annular and is provided at the other end portion in the axial direction of the inner cylinder 15 and the outer cylinder 16, on the side opposite to the valve body 25. The valve body 25 constitutes a body valve 30.

[0013] One end portion in the axial direction of the inner cylinder 15 is fitted to the valve body 25. The inner cylinder 15 is engaged with the bottom portion 22 of the outer cylinder 16 via this valve body 25. Further, the other end portion in the axial direction of the inner cylinder 15 is fitted to the rod guide 26. The inner cylinder 15 is engaged with the body portion 21 of the outer cylinder 16 via the rod guide 26. In this state, the inner cylinder 15 is positioned in the radial direction with respect to the outer cylinder 16. A passage groove 35 is formed in the valve body 25. The space between the valve body 25 and the bottom portion 22 communicates with the space between the inner cylinder 15 and the outer cylinder 16 via the passage groove 35. The space between the valve body 25 and the bottom portion 22 constitutes a reservoir chamber 18, similar to the space between the inner cylinder 15 and the outer cylinder 16.

[0014] The cylinder device 11 has a seal member 41. The seal member 41 is annular and is provided on the opening 23 side of the outer cylinder 16 rather than the rod guide 26. The seal member 41 is also fitted to the inner peripheral portion of the body portion 21 in the same manner as the rod guide 26. A locking portion 43 is formed at the end portion of the body portion 21 on the opening 23 side. The locking portion 43 is formed by plastically deforming the body portion 21 radially inward by caulking such as curling. The seal member 41 is sandwiched between the locking portion 43 and the rod guide 26. The seal member 41 closes the opening 23 of the outer cylinder 16. Specifically, the seal member 41 is an oil seal. Note that the seal member 41 may be configured as a seal washer.

[0015] The cylinder device 11 has a piston 45. The piston 45 is slidably fitted into the inner cylinder 15. The piston 45 divides the inside of the inner cylinder 15 into two chambers, a first chamber 48 and a second chamber 49. The first chamber 48 is the portion between the piston 45 and the rod guide 26 inside the inner cylinder 15. The second chamber 49 is the portion between the piston 45 and the valve body 25 inside the inner cylinder 15. The second chamber 49 is defined by the valve body 25 and the reservoir chamber 18. The first chamber 48 and the second chamber 49 are filled with an oil liquid L as a working fluid. The reservoir chamber 18 is filled with a gas G and an oil liquid L as working fluids.

[0016] The cylinder device 11 has a rod 10. One end of the rod 10 is connected to the piston 45. The other side of the rod 10 extends to the outside through the opening 23 from the outer cylinder 16 of the cylinder 17. The piston 45 is connected to the rod 10 by a nut 51.

[0017] The rod 10 is made of metal and has a main shaft portion 55, a mounting shaft portion 56, and a threaded shaft portion 57. The main shaft portion 55 is cylindrical. The outer peripheral surface of the main shaft portion 55 is a cylindrical surface. The mounting shaft portion 56 is cylindrical and has an outer diameter smaller than that of the main shaft portion 55. On the mounting shaft portion 56, a male thread 61 is formed on the outer peripheral portion on the side opposite to the main shaft portion 55 in the axial direction thereof. The piston 45 is fitted onto the mounting shaft portion 56. The nut 51 is screwed onto the male thread 61 of the mounting shaft portion 56.

[0018] The rod 10 extends outward from the inner cylinder 15 and the outer cylinder 16 through the rod guide 26 and the seal member 41 at the main shaft portion 55. Thus, one end side of the rod 10 in the axial direction is disposed inside the outer cylinder 16 and the inner cylinder 15, and the other end side is disposed outside the outer cylinder 16 and the inner cylinder 15. The rod 10 is in sliding contact with the rod guide 26 on the outer peripheral surface of the main shaft portion 55. The rod 10 is guided by the rod guide 26 and moves axially integrally with the piston 45 with respect to the inner cylinder 15 and the outer cylinder 16. The rod 10 is in sliding contact with the seal member 41 on the outer peripheral surface of the main shaft portion 55. The seal member 41 closes the space between the outer cylinder 16 and the rod 10. The seal member 41 restricts leakage of the oil L inside the inner cylinder 15, the oil L and the gas G inside the reservoir chamber 18 to the outside. The rod 10 is provided with the threaded shaft portion 57 at the portion protruding outward from the cylinder 17 and the seal member 41.

[0019] The piston 45 is formed with a passage 65 and a passage 66. The passages 65 and 66 penetrate the piston 45 in the axial direction of the piston 45. The passages 65 and 66 enable communication between the first chamber 48 and the second chamber 49. The cylinder device 11 has a disk valve 67. The disk valve 67 is provided on the side opposite to the bottom portion 22 in the axial direction of the piston 45. The disk valve 67 is annular and closes the passage 65 by abutting against the piston 45. The cylinder device 11 has a disk valve 68. The disk valve 68 is provided on the bottom portion 22 side in the axial direction of the piston 45. The disk valve 68 is annular and closes the passage 66 by abutting against the piston 45.

[0020] The direction in which the rod 10 increases its amount of entry into the inner cylinder 15 and the outer cylinder 16 is defined as the contraction side. When the rod 10 moves to the contraction side, the piston 45 moves in the direction of narrowing the second chamber 49. As a result, when the pressure in the second chamber 49 becomes higher than the pressure in the first chamber 48 by a predetermined value or more, the disk valve 67 opens the passage 65 and causes the hydraulic fluid L in the second chamber 49 to flow into the first chamber 48. At that time, the disk valve 67 generates a damping force.

[0021] The direction in which the rod 10 increases its amount of protrusion from the inner cylinder 15 and the outer cylinder 16 is defined as the extension side. When the rod 10 moves to the extension side, the piston 45 moves in the direction of narrowing the first chamber 48. As a result, when the pressure in the first chamber 48 becomes higher than the pressure in the second chamber 49 by a predetermined value or more, the disk valve 68 opens the passage 66 and causes the hydraulic fluid L in the first chamber 48 to flow into the second chamber 49. At that time, the disk valve 68 generates a damping force.

[0022] At least one of the piston 45 and the disk valve 67 is formed with a fixed orifice (not shown). This fixed orifice communicates the first chamber 48 and the second chamber 49 via the passage 65 even when the disk valve 67 closes the passage 65 most. Also, at least one of the piston 45 and the disk valve 68 is formed with a fixed orifice (not shown). This fixed orifice communicates the first chamber 48 and the second chamber 49 via the passage 66 even when the disk valve 68 closes the passage 66 most.

[0023] The valve body 25 is formed with a liquid passage 71 and a liquid passage 72. The liquid passages 71, 72 penetrate the valve body 25 in the axial direction of the valve body 25. The liquid passages 71, 72 can communicate the second chamber 49 and the reservoir chamber 18. The body valve 30 has a disk valve 75. The disk valve 75 is provided on the bottom 22 side in the axial direction of the valve body 25. The disk valve 75 is annular and closes the liquid passage 71 by abutting against the valve body 25.

[0024] Further, the body valve 30 has a disk valve 76. The disk valve 76 is provided on the side opposite to the bottom 22 in the axial direction of the valve body 25. The disk valve 76 is annular and closes the liquid passage 72 by abutting against the valve body 25. The body valve 30 has a pin 78. The disk valves 75 and 76 are fixed to the valve body 25 by this pin 78. The body valve 30 divides the inside of the cylinder 17 into two chambers, i.e., a second chamber 49 and a reservoir chamber 18.

[0025] When the rod 10 moves to the retracting side and the piston 45 moves in a direction to narrow the second chamber 49, as a result, when the pressure in the second chamber 49 becomes higher than the pressure in the reservoir chamber 18 by a predetermined value or more, the body valve 30 causes the disk valve 75 to open the liquid passage 71 and flow the oil L in the second chamber 49 to the reservoir chamber 18. At that time, the disk valve 75 generates a damping force. When the rod 10 moves to the extending side and the piston 45 moves to the first chamber 48 side, as a result, when the pressure in the second chamber 49 drops below the pressure in the reservoir chamber 18, the body valve 30 causes the disk valve 76 to open the liquid passage 72 and flow the oil L in the reservoir chamber 18 to the second chamber 49. The disk valve 76 allows the oil L to flow from the reservoir chamber 18 into the second chamber 49 without substantially generating a damping force at that time. The disk valve 76 is a suction valve.

[0026] In the cylinder device 11, for example, the rod 10 is connected to the vehicle body side and the cylinder 17 is connected to the vehicle wheel side, and a damping force is generated against the movement of the wheel relative to the vehicle body.

[0027] Next, a method for manufacturing the rod 10 and a rod manufacturing apparatus 81 according to the present embodiment will be described below. In the method for manufacturing the rod 10 according to the present embodiment, plating is applied to the rod 10. Specifically, in the method for manufacturing the rod 10 according to the present embodiment, chrome plating is applied to the surface of the steel rod 10.

[0028] As shown in FIGS. 2 and 3, the rod manufacturing apparatus 81 of this embodiment includes a treatment tank 91 and an anode device 93. The treatment tank 91 includes an inner cylinder 101 (second cylinder) and an outer cylinder 102. Note that the reference sign CL shown in each figure indicates the central axis shared by each component. The inner cylinder 101 has a bottomed cylindrical shape. The central axis CL of the inner cylinder 101 is along the vertical direction. A liquid inlet 111 that opens into the inner cylinder 101 is provided at the lower end of the inner cylinder 101. The liquid inlet 111 opens upward. The liquid inlet 111 is provided on the central axis CL of the inner cylinder 101. The outer cylinder 102 has a bottomed cylindrical shape. The central axis CL of the outer cylinder 102 is along the vertical. The inner diameter of the outer cylinder 102 is larger than the outer diameter of the inner cylinder 101. The inner cylinder 101 and the outer cylinder 102 have their respective central axes CL aligned. A liquid outlet 112 that opens between the inner cylinder 101 and the outer cylinder 102 is provided at the lower end of the outer cylinder 102. The liquid outlet 112 opens upward.

[0029] The rod manufacturing apparatus 81 of this embodiment has a work support portion (not shown). The work support portion is made of a conductive material. The threaded shaft portion 57 of the rod 10, which is the work to be plated, is screwed into the work support portion. Thereby, the rod 10 is supported by the work support portion. The rod 10 supported by the work support portion is arranged along the vertical direction within the inner cylinder 101. Moreover, the rod 10 is arranged coaxially with the inner cylinder 101.

[0030] The anode device 93 includes a power supply portion 120 and an anode body 121 (first cylinder). The power supply portion 120 has a flat plate shape and is made of a conductive material. The power supply portion 120 is arranged horizontally and attached to the upper ends of the inner cylinder 101 and the outer cylinder 102. A positive voltage is applied to the power supply portion 120 of the anode device 93. The anode body 121 is attached to the power supply unit 120 so as to extend vertically downward from the power supply unit 120. The anode body 121 is positioned and supported by the inner cylinder 101 and the outer cylinder 102 via the power supply unit 120. The anode body 121 is provided on the inner circumferential side of the inner cylinder 101. In other words, the inner cylinder 101 is disposed on the outer peripheral side of the anode body 121, and the outer cylinder 102 is disposed on the outer peripheral side of the inner cylinder 101.

[0031] The anode body 121 has a plurality (specifically, eight) of rod-shaped members 131 shown in FIG. 4. These rod-shaped members 131 are annularly arranged as shown in FIG. 4 while being supported by the inner cylinder 101 and the outer cylinder 102 via the power supply unit 120. In other words, the anode body 121 is formed by arranging a plurality of rod-shaped members 131 in an annular shape. Since the anode body 121 is formed by arranging a plurality of rod-shaped members 131 in an annular shape in this way, it is generally cylindrical. The rod 10 in a state of being supported by the inner cylinder 101 and the outer cylinder 102 via a work support portion (not shown) is disposed inside the anode body 121 as shown in FIGS. 3 and 4.

[0032] The plurality of rod-shaped members 131 constituting the anode body 121 are all common parts having the same shape and the same configuration. The rod-shaped member 131 has a rectangular parallelepiped shape as shown in FIG. 5. The rod-shaped member 131 has a base material 141 and a platinum layer 142.

[0033] The base material 141 of this embodiment is in the shape of a rectangular parallelepiped. The base material 141 is made of a conductive material such as titanium. The base material 141 has a face 151, a face 152, a face 153, a face 154, a face 155, and a face 156. Both the face 151 and the face 152 are planes and have the same rectangular shape. The face 151 and the face 152 are parallel to each other and face in opposite directions. Both the face 153 and the face 154 are planes. The plane of the base material 141 is not limited to a rectangle and may be a square. The face 153 and the face 154 are parallel to each other and face in opposite directions. Both the face 155 and the face 156 are planes and have the same rectangular shape. The face 155 and the face 156 are parallel to each other and face in opposite directions. The faces 151 and 152 are larger in area than the faces 153 and 154, and are also larger in area than the faces 155 and 156. The faces 155 and 156 are at the ends of the base material 141 in the length direction.

[0034] The platinum layer 142 is made of platinum foil. The platinum foil constituting the platinum layer 142 is welded to the face 151 of the base material 141. In other words, the rod-shaped member 131 forms the platinum layer 142 by welding platinum foil to the face 151 which is the surface of the base material 141. The platinum layer 142 is formed so as to cover the entire face 151 of the base material 141.

[0035] The rod-shaped member 131 has two first side portions 161, two second side portions 162, four third side portions 163, two fourth side portions 164, and two fifth side portions 165. The two first side portions 161 have the same length and are both provided on the platinum layer 142. The first side portion 161 is the longest side portion of the rod-shaped member 131. The two second side portions 162 have the same length and are provided on the platinum layer 142. The second side portion 162 is shorter in length than the first side portion 161. One of the two second side portions 162 connects the one ends on the same side in the length direction of the two first side portions 161. The other of the two second side portions 162 connects the other ends on the opposite side to these one ends in the length direction of the two first side portions 161. The portion surrounded by the two first side portions 161 and the two second side portions 162 is the first surface 171. The first surface 171 is formed on the platinum layer 142. In other words, in the rod-shaped member 131, the first surface 171 is made of platinum.

[0036] All four third side portions 163 have the same length and extend perpendicularly from the four corners of the first surface 171 with respect to the first surface 171. The third side portion 163 is shorter than the first side portion 161 and shorter than the second side portion 162. The third side portion 163 is the side portion with the shortest length in the rod-shaped member 131. Both two fourth side portions 164 have the same length as the first side portion 161 and are both parallel to the first side portion 161. Both two fifth side portions 165 have the same length as the second side portion 162 and are both parallel to the second side portion 162.

[0037] The portion surrounded by one of the two second side portions 162, the two third side portions 163 adjacent and continuous thereto, and the fifth side portion 165 adjacent and continuous thereto is the second surface 172. The portion surrounded by the other of the two second side portions 162, the two third side portions 163 adjacent and continuous thereto, and the fifth side portion 165 adjacent and continuous thereto is also the second surface 172. These second surfaces 172 are parallel to each other and face in opposite directions. The second surfaces 172 are respectively provided at both ends in the length direction of the rod-shaped member 131.

[0038] The portion surrounded by one of the two first side portions 161, the two third side portions 163 adjacent and continuous thereto, and the fourth side portion 164 adjacent and continuous thereto is the third surface 173. The portion surrounded by the other of the two first side portions 161, the two third side portions 163 adjacent and continuous thereto, and the fourth side portion 164 adjacent and continuous thereto is also the third surface 173. These two third surfaces 173 are parallel to each other and face in opposite directions. The portion surrounded by the two fourth side portions 164 and the two fifth side portions 165 forms the fourth surface 174. The fourth surface 174 and the first surface 171 are parallel to each other and face in opposite directions. The fourth surface 174 is formed on the base material 141.

[0039] The anode body 121 in the mounted state attached to the inner cylinder 101 and the outer cylinder 102 via the power supply unit 120 is arranged in an annular shape as shown in FIG. 4 such that all the rod-shaped members 131 are in line contact with the same virtual cylindrical surface C on the first surface 171 made of the platinum layer 142. The anode body 121 in the mounted state is arranged such that the central axis CL of this virtual cylindrical surface C coincides with the central axis of the rod 10 supported by the work support portion (not shown in detail). The anode body 121 in the mounted state faces the first surface 171 where all the rod-shaped members 131 are in contact with this virtual cylindrical surface C toward the rod 10 supported by the work support portion (not shown in detail). The first surface 171 where all the rod-shaped members 131 are in contact with the virtual cylindrical surface C extends orthogonally to the radial direction of the rod 10 supported by the work support portion (not shown in detail).

[0040] The anode body 121 in the mounted state has all the rod-shaped members 131 along the vertical direction for the first side portion 161 and the fourth side portion 164 shown in FIG. 5, and along the horizontal direction for the second side portion 162, the third side portion 163, and the fifth side portion 165. The anode body 121 in the mounted state has all the rod-shaped members 131 with the second side portion 162 as the tangent of the above-mentioned virtual cylindrical surface C. Also, the anode body 121 in the mounted state has all the rod-shaped members 131 aligned in the axial direction of this virtual cylindrical surface C. Also, the anode body 121 in the mounted state has all the rod-shaped members 131 arranged at equal intervals in the circumferential direction of this virtual cylindrical surface C. Also, the anode body 121 in the mounted state has all the rod-shaped members 131 arranged with a gap 181 formed between adjacent rod-shaped members 131 in the circumferential direction of this virtual cylindrical surface C. The anode body 121 in the mounted state is arranged coaxially with the inner cylinder 101 and the outer cylinder 102. Since the anode body 121 is formed by arranging a plurality of rod-shaped members 131 made of square bars in an annular shape, it generally has a polygonal (specifically, regular octagonal) cylindrical shape and is generally cylindrical.

[0041] The circumferential direction of the virtual cylindrical surface C described above is defined as the circumferential direction of the anode body 121 that is generally cylindrical as a whole. Also, the axial direction of this virtual cylindrical surface C is defined as the axial direction of the anode body 121. Further, the radial direction of this virtual cylindrical surface C is defined as the radial direction of the anode body 121. The anode body 121 is composed of a plurality of rod-shaped members 131 extending in the axial direction of the anode body 121. The anode body 121 is composed of a plurality of rod-shaped members 131 arranged at equal intervals in the circumferential direction of the anode body 121. The anode body 121 has a gap 181 between adjacent rod-shaped members 131 in the circumferential direction of the anode body 121. This gap 181 penetrates the anode body 121 in the radial direction of the anode body 121. The width of this gap 181 in the circumferential direction of the anode body 121 is narrower on the inner side than on the outer side in the radial direction of the anode body 121. The space between the upper end of the inner cylinder 101 shown in FIG. 3 and the upper end of the anode body 121 is closed by a pair of lid portions 185 and a power supply portion 120 shown in FIG. 2.

[0042] The rod manufacturing apparatus 81 is inserted inside the anode body 121 in the radial direction with the rod 10 attached to a work support portion (not shown) as shown in FIG. 3. In other words, the rod 10 is arranged inside the anode body 121. In this state, the rod 10 is arranged coaxially with the anode body 121. In this state, the space between the anode body 121 and the rod 10 becomes the first flow path 201. The first flow path 201 is a space formed between the rod 10 arranged inside the anode body 121 and the anode body 121. As shown in FIG. 2, the upper end of the first flow path 201 opens on the upper surface of the power supply portion 120. As shown in Fig. 3, a second flow path 202 is formed between the anode body 121 and the inner cylinder 101. In other words, the inner cylinder 101 is arranged on the outer peripheral side of the anode body 121, and the second flow path 202 is provided between the anode body 121 and the inner cylinder 101. The inner cylinder 101 extends downward beyond the lower end positions of the rod 10 and the anode body 121. As a result, the lower parts of the first flow path 201 and the second flow path 202 communicate with each other. A liquid inlet 111 opens at this communication part. Also, as shown in Fig. 4, the first flow path 201 and the second flow path 202 communicate with each other via a gap 181. Since the upper end part of the inner cylinder 101 and the upper end part of the anode body 121 shown in Fig. 3 are closed by the pair of lid parts 185 and the power supply part 120 shown in Fig. 2, the upper end of the second flow path 202 shown in Fig. 3 is not open. A third flow path 203 is formed between the inner cylinder 101 and the outer cylinder 102. The upper end of the third flow path 203 is open. A liquid discharge port 112 opens at the lower end of the third flow path 203.

[0043] In the rod manufacturing apparatus 81, a plating solution F is injected into the treatment tank 91. Then, the plating solution F is discharged from the liquid inlet 111 into the treatment tank 91 by a pump (not shown). At the same time, the plating solution F in the treatment tank 91 is discharged from the liquid discharge port 112 by a pump (not shown). Then, in the plating solution F in the treatment tank 91, a flow that flows upward from the lower side along the vertical direction of the first flow path 201 as indicated by the dashed arrow f1 in Fig. 3 and a flow that flows upward from the lower side along the vertical direction of the second flow path 202 as indicated by the dashed arrow f2 in Fig. 3 are generated. In other words, the plating solution F flows in one direction between the first surface 171 shown in Fig. 4 of the plurality of rod-shaped members 131 of the anode body 121 and the rod 10. More specifically, the cylindrical anode body 121 forms a space in which the plating solution F flows between the rod 10 disposed inside.

[0044] Here, as shown by the dashed arrow f1, the plating solution F flowing upward from the bottom in the first flow path 201 flows out from the upper end where the first flow path 201 opens, as shown by the dashed arrow f3 in FIG. 3. Then, since the upper end of the second flow path 202 is not open, the plating solution F flowing out from the first flow path 201 passes over the power supply unit 120 and the lid portion 185 shown in FIG. 2 and is introduced into the third flow path 203 from the upper end of the third flow path 203. Here, on the upper surface side of the power supply unit 120 and the outer cylinder 102, an annular guide 205 such as a seal ring is provided to regulate the flow of the plating solution F so that the plating solution F does not cross the outer cylinder 102 radially outward and guide the plating solution F to the third flow path 203. Note that the guide 205 only needs to be provided on the upper surface of at least the power supply unit 120. Also, since the upper end of the second flow path 202 is not open, the plating solution F flowing through the second flow path 202 merges into the first flow path 201 through the gap 181 as shown by the dashed arrow f4 in FIG. 4, then flows out from the upper end of the first flow path 201, and is introduced into the third flow path 203 from the upper end of the third flow path 203. In other words, the plating solution F flowing through the second flow path 202 is not directly introduced into the third flow path 203, but is introduced into the third flow path 203 via the first flow path 201. In the plating solution F introduced into the third flow path 203, a flow is generated that flows downward from the upper side along the vertical direction of the third flow path 203, as shown by the dashed arrow f5 in FIG. 3, by the suction of a pump (not shown).

[0045] Then, with the flow of the plating solution F generated in the processing tank 91, the power supply unit 120 and the anode body 121 of the anode device 93 are used as anodes, and a voltage is applied with a work support part (not shown) and the rod 10 as cathodes. In other words, a positive voltage is applied to the power supply unit 120 and the anode body 121 of the anode device 93 via the power supply unit 120. At this time, for the anode device 93, the first surface 171 of all the rod-shaped members 131 becomes the energized surface. In this way, the plating solution F is caused to flow in one direction through the first flow path 201 and the second flow path 202 to plate the rod 10. At that time, the plating solution F is caused to flow through the first flow path 201 between the first surface 171 of the plurality of rod-shaped members 131 of the anode body 121 facing the rod 10 and the rod 10. In other words, with the first surface 171 of the rod-shaped member 131 facing the rod 10, the plating solution is caused to flow between the first surface 171 and the rod 10. At that time, the plating solution F flows in and out between the second flow path 202 and the first flow path 201 through the gap 181 between adjacent rod-shaped members 131 in the circumferential direction of the anode body 121. In other words, a gap 181 is provided between adjacent rod-shaped members 131, the inner cylinder 101 is arranged on the outer peripheral side of the anode body 121, the second flow path 202 is provided between the anode body 121 and the inner cylinder 101, and while the plating solution F is caused to flow in one direction through the first flow path 201 between the anode body 121 and the rod 10, the plating solution F flows in and out between the first flow path 201 and the second flow path 202 through the gap 181 between the plurality of rod-shaped members 131. In this way, plating is electrodeposited on the surface of the metal rod 10 to form a plating film.

[0046] In the embodiment, the rod 10 and the anode body 121 are arranged to extend in the vertical direction, but it is not limited to this, and they may be arranged to extend in any direction. For example, the rod 10 and the anode body 121 may be arranged to extend in the horizontal direction.

[0047] Patent Document 1 mentioned above describes an anode having a conductive outer cylinder portion and a platinum inner cylinder portion welded so as to be in contact with the inner surface of the outer cylinder portion. This anode is formed by overlapping and welding a titanium flat plate material and a platinum flat plate material, and then bending them into a cylindrical shape with the platinum flat plate material on the inside. When it is necessary to bend it into a cylindrical shape, it becomes difficult to ensure the thickness of the anode. As a result, the current-carrying area decreases and problems arise with durability. Also, due to the bending into a cylindrical shape, peeling is likely to occur between the inner and outer layers due to internal stress, and there are also problems with durability in this regard.

[0048] Here, for an anode device for chromium plating, from the viewpoints of conductivity and chromium acid resistance, it is common to use titanium with a platinum layer coated on the current-carrying surface. The platinum layer is generally formed either by electrodeposition by platinum plating or by welding a platinum foil. In that case, from the perspective of cost-effectiveness, it is good to coat only the surface facing the object to be plated with the platinum layer. Note that among platinum plating and platinum foil, the platinum foil is denser and has fewer defects such as pinholes. For this reason, the platinum foil is less likely to deteriorate due to electrolytic consumption or interfacial peeling through defects, and is more durable than platinum plating. As the shape of the anode device for high-speed plating, a cylindrical shape is adopted for the purpose of uniformizing the film thickness distribution. However, since it is very difficult to weld the platinum foil to the cylindrical surface, platinum plating (thickness: 3 μm to 5 μm) is applied to the platinum layer on the inner surface. For this reason, there has been a problem that the life of the platinum layer is short and the replacement frequency is high.

[0049] In contrast, in the rod manufacturing apparatus 81 and the anode apparatus 93 of the present embodiment, the anode body 121 is formed by arranging a plurality of rod-shaped members 131 in a ring shape. And, in the method for manufacturing the rod 10 of the present embodiment, the rod 10 is arranged in the anode body 121, and the plating solution F is caused to flow in one direction through the first flow path 201 between the anode body 121 and the rod 10 to apply plating to the rod 10. Thus, since the anode body 121 is formed by arranging a plurality of rod-shaped members 131 in a ring shape, it becomes possible to form the platinum layer 142 with platinum foil. Therefore, the durability of the anode body 121 can be significantly improved, and thus the durability of the rod manufacturing apparatus 81 can be significantly improved. Also, in the rod manufacturing apparatus 81 and the anode apparatus 93, since the anode body 121 is formed by arranging a plurality of rod-shaped members 131 in a ring shape, the thickness in the radial direction of the anode body 121 can be ensured. Also by this, the durability of the anode body 121 can be improved. Also, in the rod manufacturing apparatus 81 and the anode apparatus 93, since the thickness in the radial direction of the anode body 121 can be ensured, the current-carrying area of the anode body 121 can be increased. Therefore, even in the case of high-speed plating in which a current about 10 times that of normal plating is passed, the durability can be improved. Also, in the rod manufacturing apparatus 81 and the anode apparatus 93, the anode body 121 is formed by arranging a plurality of rod-shaped members 131 in a ring shape. For this reason, even if deterioration such as peeling of the platinum layer 142 occurs in the rod-shaped members 131, it is only necessary to replace only the deteriorated rod-shaped member 131 among the plurality of rod-shaped members 131. Therefore, the running cost of the anode body 121 can be reduced.

[0050] Further, in the rod manufacturing apparatus 81 and the anode apparatus 93 of the present embodiment, the rod-shaped member 131 is formed by a first side portion 161 and a second side portion 162 shorter than the first side portion 161, and has a first surface 171 made of platinum, and a second surface 172 formed by a third side portion 163 shorter than the first side portion 161 and the second side portion 162, and is in a quadrangular prism shape. Further, the rod manufacturing apparatus 81 faces the first surface 171 of the rod-shaped member 131 toward the rod 10. And, in the manufacturing method of the rod 10 of the present embodiment, a plating solution F is caused to flow between the first surface 171 of the rod-shaped member 131 and the rod 10 to perform plating on the rod 10. Since the rod-shaped member 131 is in a quadrangular prism shape, it becomes possible to easily form the platinum layer 142 with a platinum foil.

[0051] Further, in the rod manufacturing apparatus 81 and the anode apparatus 93 of the present embodiment, the anode body 121 provides a gap 181 between adjacent rod-shaped members 131. And, in the manufacturing method of the rod 10 of the present embodiment, while flowing the plating solution F in one direction through the first flow path 201 between the anode body 121 and the rod 10, the plating solution F flows in and out between the second flow path 202 between the anode body 121 and the inner cylinder 101 and the first flow path 201 through the gap 181. Thereby, an effect of stirring the plating solution F is obtained, and unevenness in the concentration and temperature of the plating solution F can be suppressed. Therefore, the plating quality can be improved.

[0052] Moreover, since the upper end of the second flow path 202 is not open, the plating solution F flowing through the second flow path 202 is finally guided to merge into the first flow path 201 through the gap 181. In this way, the plating solution F having no place to go from the second flow path 202 flows into the first flow path 201 through the gap 181. Therefore, the effect of stirring the plating solution F is obtained even more highly, and unevenness in the concentration and temperature of the plating solution F can be further suppressed. Therefore, the plating quality can be further improved.

[0053] Here, regarding the case of plating the rod 10 using an anode body having a polygonal cylindrical shape, simulations of plating film formation were performed while varying the number of sides. The results are shown in FIGS. 6 and 7. Here, the inner diameter of the virtual cylindrical surface C was set to φ50 (mm), and the outer diameter of the rod 10 was set to φ22 (mm). FIGS. 6 and 7 show the plating film thicknesses at a plurality of positions in the circumferential direction of the rod 10 for each case where the anode body has a polygonal shape with 4 to 15 sides and where the anode body has a cylindrical shape. In FIG. 6, "max" indicates the maximum value of the plating film thickness, "min" indicates the minimum value of the plating film thickness, "σ" indicates the standard deviation, and "Cp" indicates the process capability index. FIG. 7 has the plating film thickness and the standard deviation on the vertical axis, the range from the left side to the middle of the horizontal axis is the number of sides, and the right end side of the horizontal axis is the case of a cylinder. From this result, it can be seen that if the anode body has a polygonal shape with 7 or more sides, the variation in the plating film thickness can be suppressed to the same level as that of a cylinder.

[0054] Note that the rod-shaped member 131 can also form a platinum layer 142 by applying platinum plating to the surface of the base material 141. Also in this case, since the anode body 121 is formed by arranging a plurality of rod-shaped members 131 in a ring shape, it is not necessary to bend the anode body 121 after platinum plating. Therefore, the generation of internal stress in the anode body 121 can be suppressed. For this reason, the concern about the decrease in the adhesion of the platinum layer 142 is reduced. Moreover, by roughening the surface of the base material 141 by a pretreatment such as shot blasting, the adhesion of the platinum layer 142 can be improved. Therefore, the durability of the anode body 121 can be improved, and thus the durability of the rod manufacturing apparatus 81 can be improved.

[0055] In this case, it becomes possible to easily apply platinum plating to the first surface 171 and the fourth surface 174 of the rod-shaped member 131. With such a configuration, when the platinum plating on the first surface 171 peels off in one rod-shaped member 131, this rod-shaped member 131 is rotated so that the fourth surface 174 faces the rod 10. By doing so, two first surfaces 171 and fourth surfaces 174 of one rod-shaped member 131 can be alternately arranged and used so as to face the rod 10. Therefore, the running cost of the anode body 121 can be further reduced. Furthermore, if the first surface 171, the two third surfaces 173, and the fourth surface 174 of the rod-shaped member 131 have the same shape and platinum plating is applied thereto, the running cost of the anode body 121 can be further reduced.

Industrial Applicability

[0056] According to the method for manufacturing a rod and the anode device according to each of the above aspects of the present invention, the durability of the device to be used can be improved. Therefore, the industrial applicability is great.

Explanation of Signs

[0057] 10…Rod, 93…Anode device, 101…Inner cylinder (second cylinder), 121…Anode body (first cylinder), 131…Rod-shaped member, 171…First surface, 172…Second surface, 161…First side portion, 162…Second side portion, 163…Third side portion, 181…Gap, 201…First flow path, 202…Second flow path.

Claims

1. A method for manufacturing a rod having plating applied thereto, comprising: placing the rod within a first cylindrical body formed by arranging a plurality of rod-shaped members in a ring shape; flowing plating solution in a single direction through a first flow path between the first cylindrical body and the rod to apply plating to the rod. The rod-shaped member has a quadrangular prism shape having a first surface facing the rod, a second surface parallel to and facing in the opposite direction of the first surface, and third and fourth surfaces connecting the first surface and the second surface. The first surface and at least one other surface are coated with a platinum layer. When deterioration occurs in the platinum layer on the first surface, it can be replaced with a surface coated with another platinum layer. A method for manufacturing a rod.

2. The rod-shaped member has a quadrangular prism shape formed by a first side portion and a second side portion shorter than the first side portion, with the first surface coated with a platinum layer, and a surface formed by a third side portion shorter than the first side portion and the second side portion. The first surface is opposed to the rod, and the plating solution is flowed between the first surface and the rod. The method for manufacturing a rod according to Claim 1.

3. Providing a gap between adjacent rod-shaped members. Arranging a second cylindrical body on the outer peripheral side of the first cylindrical body to provide a second flow path between the first cylindrical body and the second cylindrical body. While flowing the plating solution in a single direction through the first flow path between the first cylindrical body and the rod, the plating solution flows in and out between the first flow path and the second flow path through the gap. The method for manufacturing a rod according to Claim 1 or 2.

4. An anode device having a plurality of rod-shaped members arranged in a ring shape to form a first cylindrical body, thereby forming a space through which plating solution flows between the first cylindrical body and a rod disposed inside the first cylindrical body, and to which a positive voltage is applied. The rod-shaped member has a quadrangular prism shape having a first surface facing the rod, a second surface parallel to and facing in the opposite direction of the first surface, and third and fourth surfaces connecting the first surface and the second surface. The first surface and at least one other surface are coated with a platinum layer. When deterioration occurs in the platinum layer on the first surface, it can be replaced with a surface coated with another platinum layer. An anode device.

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