Patent Application
20240392462
The present invention relates to a rod manufacturing method and an anode device.
Priority is claimed on Japanese Patent Application No. 2021-170813, filed Oct. 19, 2021, the content of which is incorporated herein by reference.
There is an anode that has a conductive outer tube portion and an inner tube portion made of platinum that is welded to be in contact with the inner surface of the outer tube portion (for example, see Patent Document 1).
In a rod manufacturing method in which a rod is plated, it is desired to improve the durability of a device used.
Therefore, an object of the present invention is to provide a rod manufacturing method and an anode device that can improve the durability of a device used.
To achieve the above object, the present invention has employed 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 by plating the rod, and includes: a step of arranging the rod in a first tube body formed by arranging a plurality of rod-shaped members in an annular shape; and a step of plating the rod by causing a plating liquid to flow in one direction through a first flow path between the first tube body and the rod.
Further, an anode device according to one aspect of the present invention includes a plurality of rod-shaped members that are disposed in an annular shape to form a first tube body and form a space through which a plating liquid flows between the first tube body and a rod disposed in the first tube body, wherein a positive voltage is applied to the anode device.
According to the above aspects of the present invention, it is possible to improve the durability of a device used.
One embodiment of the present invention will be described below with reference to the drawings.
First, a cylinder device 11 including a rod 10 manufactured by a manufacturing method of the present embodiment will be explained with reference to
The cylinder device 11 shown in
The outer tube 16 has a body portion 21, a bottom portion 22, and an opening 23. The body portion 21 has a cylindrical shape. The bottom portion 22 closes one end portion side of the body portion 21 in an axial direction. The opening 23 is provided at the body portion 21 on a side opposite to the bottom portion 22. The inner tube 15 is an integrally molded 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 has an annular shape and is provided at one end portion of the inner tube 15 in the axial direction. The valve body 25 is placed over the bottom portion 22 of the outer tube 16. The rod guide 26 has an annular shape and is provided at the other end portion of the inner tube 15 and the outer tube 16 on a side opposite to the valve body 25 in the axial direction. The valve body 25 constitutes a body valve 30.
One end portion of the inner tube 15 in the axial direction is fitted into the valve body 25. The inner tube 15 engages with the bottom portion 22 of the outer tube 16 via the valve body 25. Further, the other end portion of the inner tube 15 in the axial direction is fitted into the rod guide 26. The inner tube 15 engages with the body portion 21 of the outer tube 16 via the rod guide 26. In this state, the inner tube 15 is positioned in a radial direction with respect to the outer tube 16. A passage groove 35 is formed in the valve body 25. A portion between the valve body 25 and the bottom portion 22 communicates with a portion between the inner tube 15 and the outer tube 16 via the passage groove 35. The portion between the valve body 25 and the bottom portion 22 constitutes the reservoir chamber 18 similarly to the portion between the inner tube 15 and the outer tube 16.
The cylinder device 11 has a seal member 41. The seal member 41 has an annular shape and is provided closer to the opening 23 of the outer tube 16 than the rod guide 26. The seal member 41 is also fitted into the inner peripheral portion of the body portion 21 similarly to the rod guide 26. A locking portion 43 is formed at the end portion of the body portion 21 on a side of the opening 23. The locking portion 43 is formed by plastically deforming the body portion 21 inward in the radial direction by a crimping process such as a curling process. 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 tube 16. The seal member 41 is specifically an oil seal. The sealing member 41 may be constituted by a sealing washer.
The cylinder device 11 has a piston 45. The piston 45 is slidably fitted within the inner tube 15. The piston 45 divides the inside of the inner tube 15 into two chambers, a first chamber 48 and a second chamber 49. The first chamber 48 is a portion between the piston 45 in the inner tube 15 and the rod guide 26. The second chamber 49 is a portion between the piston 45 in the inner tube 15 and the valve body 25. The second chamber 49 is demarcated from the reservoir chamber 18 by the valve body 25. The first chamber 48 and the second chamber 49 are filled with oil L as a working fluid. The reservoir chamber 18 is filled with gas G and oil Las working fluids.
The cylinder device 11 has the rod 10. One end of the rod 10 is connected to the piston 45. The other side of the rod 10 extends outward from the outer tube 16 of the cylinder 17 through an opening 23. The piston 45 is connected to the rod 10 by a nut 51.
The rod 10 is made of a metal and has a main shaft portion 55, an attachment shaft portion 56, and a threaded shaft portion 57. The main shaft portion 55 has a cylindrical shape. The outer peripheral surface of the main shaft portion 55 is a cylindrical surface. The attachment shaft portion 56 has a cylindrical shape and has an outer diameter smaller than the outer diameter of the main shaft portion 55. A male screw 61 is formed on the outer peripheral portion of the attachment shaft portion 56 on a side opposite to the main shaft portion 55 in the axial direction. The piston 45 is fitted into the attachment shaft portion 56. The nut 51 is screwed onto a male screw 61 of the attachment shaft portion 56.
The rod 10 extends from the inner tube 15 and the outer tube 16 to the outside through the rod guide 26 and the seal member 41 at the main shaft portion 55. As a result, one end side of the rod 10 in the axial direction is disposed within the outer tube 16 and the inner tube 15, and the other end side thereof is disposed outside the outer tube 16 and the inner tube 15. The main shaft portion 55 of the rod 10 is in sliding contact with the rod guide 26 on the outer peripheral surface thereof. The rod 10 is guided by the rod guide 26 and moves together with the piston 45 in the axial direction with respect to the inner tube 15 and the outer tube 16. The main shaft portion 55 of the rod 10 is in sliding contact with the seal member 41 on the outer peripheral surface thereof. The seal member 41 closes a portion between the outer tube 16 and the rod 10. The seal member 41 prevents the oil L in the inner tube 15 and the oil L and the gas G in the reservoir chamber 18 from leaking to the outside. The rod 10 is provided with the threaded shaft portion 57 at a portion that protrudes outward from the cylinder 17 and the seal member 41.
A passage 65 and a passage 66 are formed in the piston 45. The passages 65 and 66 penetrate the piston 45 in the axial direction of the piston 45. The passages 65 and 66 allow the first chamber 48 and the second chamber 49 to communicate with each other. The cylinder device 11 has a disk valve 67. The disk valve 67 is provided at the piston 45 on a side opposite to the bottom portion 22 in the axial direction. The disk valve 67 has an annular shape and closes the passage 65 by coming into contact with the piston 45. The cylinder device 11 has a disk valve 68. The disk valve 68 is provided at the piston 45 on a side of the bottom portion 22 in the axial direction. The disk valve 68 has an annular shape and closes the passage 66 by coming into contact with the piston 45.
The direction in which the amount of entry of the rod 10 into the inner tube 15 and the outer tube 16 is increased is defined as a contraction side. When the rod 10 moves to the contraction side, 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 first chamber 48 by a predetermined value or more, the disk valve 67 opens the passage 65 and allows the oil L in the second chamber 49 to flow into the first chamber 48. At this time, the disk valve 67 generates a damping force.
The direction in which the amount of protrusion of the rod 10 from the inner tube 15 and the outer tube 16 is increased is defined as an extension side. When the rod 10 moves to the extension side, the piston 45 moves in a direction to narrow 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 allows the oil L in the first chamber 48 to flow into the second chamber 49. At this time, the disk valve 68 generates a damping force.
A fixed orifice (not shown) is formed in at least one of the piston 45 and the disk valve 67. This fixed orifice allows communication between the first chamber 48 and the second chamber 49 via the passage 65 even in a state in which the disk valve 67 most fully closes the passage 65. Furthermore, a fixed orifice (not shown) is formed in at least one of the piston 45 and the disk valve 68. This fixed orifice allows communication between the first chamber 48 and the second chamber 49 via the passage 66 even in a state in which the disk valve 68 most fully closes the passage 66.
A liquid passage 71 and a liquid passage 72 are formed in the valve body 25. The liquid passages 71 and 72 penetrate the valve body 25 in the axial direction of the valve body 25. The liquid passages 71 and 72 allow the second chamber 49 and the reservoir chamber 18 to communicate with each other.
The body valve 30 has a disk valve 75. The disk valve 75 is provided at the valve body 25 on a side of the bottom portion 22 in the axial direction. The disk valve 75 has an annular shape and closes the liquid passage 71 by coming into contact with the valve body 25.
Further, the body valve 30 has a disk valve 76. The disk valve 76 is provided at the valve body 25 on a side opposite to the bottom portion 22 in the axial direction. The disk valve 76 has an annular shape and closes the liquid passage 72 by coming into contact with 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 defines the inside of the cylinder 17 into two chambers, the second chamber 49 and the reservoir chamber 18.
The rod 10 moves to the contraction 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 disk valve 75 of the body valve 30 opens the liquid passage 71 and allows the oil L in the second chamber 49 to flow into the reservoir chamber 18. At this time, the disk valve 75 generates a damping force. The rod 10 moves to the extension side and the piston 45 moves to a side of the first chamber 48. As a result, when the pressure in the second chamber 49 becomes lower than the pressure in the reservoir chamber 18, the disk valve 76 of the body valve 30 opens the liquid passage 72 and allows the oil L in the reservoir chamber 18 to flow into 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.
In the cylinder device 11, for example, the rod 10 is connected to the vehicle body side of the vehicle and the cylinder 17 is connected to the wheel side of the vehicle to generate a damping force with respect to the movement of the wheels with respect to the vehicle body.
Next, a method for manufacturing the rod 10 and a rod manufacturing apparatus 81 of the present embodiment will be described below. In the method for manufacturing the rod 10 of the present embodiment, the rod 10 is plated. Specifically, in the method for manufacturing the rod 10 of the present embodiment, the surface of the rod 10 made of steel is plated with chrome.
The rod manufacturing apparatus 81 of the present embodiment has a processing tank 91 and an anode device 93, as shown in
The inner tube 101 has a bottomed cylindrical shape. The central axis CL of the inner tube 101 is in a vertical direction. A liquid introduction port 111 that opens into the inner tube 101 is provided at the lower end portion of the inner tube 101. The liquid introduction port 111 opens upward. The liquid introduction port 111 is provided on the central axis CL of the inner tube 101.
The outer tube 102 has a bottomed cylindrical shape. The central axis CL of the outer tube 102 is in a vertical direction. The outer tube 102 has an inner diameter larger than the outer diameter of the inner tube 101. The inner tube 101 and the outer tube 102 have their respective central axes CL aligned with each other. A liquid discharge port 112 that opens into a portion between the inner tube 101 and the outer tube 102 is provided at the lower end portion of the outer tube 102. The liquid discharge port 112 opens upward.
The rod manufacturing apparatus 81 of the present embodiment has a workpiece support portion (not shown). The workpiece support portion is made of a conductive material. The threaded shaft portion 57 of the rod 10 that is a workpiece to be plated is screwed into the workpiece support portion. As a result, the rod 10 is supported by the workpiece support portion. The rod 10 supported by the workpiece support portion is disposed in the vertical direction within the inner tube 101. Moreover, the rod 10 is disposed coaxially with the inner tube 101.
The anode device 93 includes a power supply portion 120 and an anode main body 121 (a first tube body).
The power supply portion 120 has a flat plate shape and is made of a conductive material. The power supply portion 120 is disposed horizontally and attached to the upper end portions of the inner tube 101 and the outer tube 102. A positive voltage is applied to the power supply portion 120 of the anode device 93.
The anode main body 121 is attached to the power supply portion 120 to extend vertically downward from the power supply portion 120. The anode main body 121 is positioned and supported by the inner tube 101 and the outer tube 102 via the power supply portion 120. The anode main body 121 is provided on the inner peripheral side of the inner tube 101. In other words, the inner tube 101 is disposed on the outer peripheral side of the anode main body 121, and the outer tube 102 is disposed on the outer peripheral side of the inner tube 101.
The anode main body 121 has a plurality of (specifically eight) rod-shaped members 131 shown in
The plurality of rod-shaped members 131 constituting the anode main body 121 are all common components having the same shape and similar configuration. As shown in
The base 141 of the present embodiment has a rectangular parallelepiped shape. The base 141 is made of a conductive material such as titanium. The base 141 has a surface portion 151, a surface portion 152, a surface portion 153, a surface portion 154, a surface portion 155, and a surface portion 156. The surface portion 151 and the surface portion 152 are both flat and have the same rectangular shape. The surface portion 151 and the surface portion 152 are parallel to each other and face in opposite directions. The surface portion 153 and the surface portion 154 are both flat. The plane of the base 141 is not limited to a rectangle, but may be a square. The surface portion 153 and the surface portion 154 are parallel to each other and face in opposite directions. The surface portion 155 and the surface portion 156 are both flat and have the same rectangular shape. The surface portion 155 and the surface portion 156 are parallel to each other and face in opposite directions. The surface portions 151 and 152 have a larger area than the surface portions 153 and 154, and have a larger area than the surface portions 155 and 156. The surface portions 155 and 156 are located at the end portions of the base 141 in a length direction.
The platinum layer 142 is made of platinum foil. The platinum foil constituting the platinum layer 142 is welded to the surface portion 151 of the base 141. In other words, the rod-shaped member 131 has the platinum layer 142 formed by welding the platinum foil to the surface portion 151 that is the surface of the base 141. The platinum layer 142 is formed to cover the entire surface portion 151 of the base 141.
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 second side portion 162 of the two second side portions 162 connects one end portions of the two first side portions 161 on the same side in the length direction to each other. The other second side portion 162 of the two second side portions 162 connects the other end portions of the two first side portions 161 on a side opposite to the one end portions in the length direction to each other.
A portion surrounded by the two first side portions 161 and the two second side portions 162 is a first surface 171. The first surface 171 is formed on the platinum layer 142. In other words, the first surface 171 of the rod-shaped member 131 is made of platinum.
The four third side portions 163 all have the same length and extend perpendicularly to the first surface 171 from four corners of 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 shortest side portion of the rod-shaped member 131.
Both of the 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 of the 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.
A portion surrounded by one second side portion 162 of the two second side portions 162, the two third side portions 163 that are adjacent and continuous thereto, and the fifth side portion 165 that are adjacent and continuous thereto is a second surface 172. A portion surrounded by the other second side portion 162 of the two second side portions 162, the two third side portions 163 that are adjacent and continuous thereto, and the fifth side portion 165 that are adjacent and continuous thereto is also a second surface 172. These second surfaces 172 are parallel to each other and face in opposite directions. The second surfaces 172 are provided at both ends of the rod-shaped member 131 in the length direction.
A portion surrounded by one first side portion 161 of the two first side portions 161, the two third side portions 163 that are adjacent and continuous thereto, and the fourth side portion 164 that are adjacent and continuous thereto is a third surface 173. A portion surrounded by the other first side portion 161 of the two first side portions 161, the two third side portions 163 that are adjacent and continuous thereto, and the fourth side portion 164 that are adjacent and continuous thereto is also a third surface 173. These two third surfaces 173 are parallel to each other and face in opposite directions.
A portion surrounded by the two fourth side portions 164 and the two fifth side portions 165 is a 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 141.
In the anode main body 121 in the attached state in which it is attached to the inner tube 101 and the outer tube 102 via the power supply portion 120, all the rod-shaped members 131 are disposed in an annular shape such that the first surfaces 171 of the platinum layers 142 are in linear contact with the same virtual cylindrical surface C, as shown in
In the anode main body 121 in the attached state, in all the rod-shaped members 131, the first side portion 161 and the fourth side portion 164 are in the vertical direction and the second side portion 162, the third side portion 163, and the fifth side portion 165 are in a horizontal direction, as shown in
Further, in the anode main body 121 in the attached state, all the rod-shaped members 131 are aligned in the axial direction of this virtual cylindrical surface C. Further, in the anode main body 121 in the attached state, all the rod-shaped members 131 are disposed at equal intervals in a circumferential direction of this virtual cylindrical surface C. Further, in the anode main body 121 in the attached state, all the rod-shaped members 131 are disposed with a gap 181 between formed the rod-shaped members 131 that are adjacent to each other in the circumferential direction of this virtual cylindrical surface C. The anode main body 121 in the attached state is disposed coaxially with the inner tube 101 and the outer tube 102.
Since the anode main body 121 is formed by the plurality of rod-shaped members 131 which are made of a square rod and disposed in the annular shape, the anode main body 121 has a tubular shape as a whole which is an polygonal (specifically, a regular octagonal), and has a generally cylindrical shape.
The circumferential direction of the virtual cylindrical surface C described above is assumed to be the circumferential direction of the anode main body 121 which has a generally cylindrical shape as a whole. Further, the axial direction of this virtual cylindrical surface C is assumed to be the axial direction of the anode main body 121. Further, the radial direction of this virtual cylindrical surface C is assumed to be the radial direction of the anode main body 121. The anode main body 121 is constituted by the plurality of rod-shaped members 131 extending in the axial direction of the anode main body 121. The anode main body 121 is constituted by the plurality of rod-shaped members 131 disposed at equal intervals in the circumferential direction of the anode main body 121. The anode main body 121 has the gap 181 between the rod-shaped member 131 and the rod-shaped member 131 that are adjacent to each other in the circumferential direction of the anode main body 121. This gap 181 penetrates the anode main body 121 in the radial direction of the anode main body 121. A width of this gap 181 in the circumferential direction of the anode body 121 is narrower on the inside than on the outside in the radial direction of the anode main body 121.
A portion between the upper end portion of the inner tube 101 and the upper end portion of the anode main body 121 shown in
In the rod manufacturing apparatus 81, the rod 10 attached to the workpiece support portion (not shown) is inserted into the inside of the anode main body 121 in the radial direction, as shown in
As shown in
A portion between the inner tube 101 and the outer tube 102 is a third flow path 203. The upper end of the third flow path 203 opens. The liquid discharge port 112 opens at the lower end of the third flow path 203.
In the rod manufacturing apparatus 81, a plating liquid F is injected into the processing tank 91. Then, the plating liquid F is discharged into the processing tank 91 from the liquid introduction port 111 by a pump (not shown). At the same time, the plating liquid F in the processing tank 91 is discharged from the liquid discharge port 112 by a pump (not shown). Then, in the plating liquid F in the processing tank 91, there are generated a flow that flows through the first flow path 201 in the vertical direction from the lower side to the upper side as shown by a broken line arrow f1 in
Here, the plating liquid F flowing through the first flow path 201 from the lower side to the upper side as shown by the broken line arrow f1 flows out from the open upper end of the first flow path 201 as shown by a broken line arrow f3 in
In the plating liquid F introduced into the third flow path 203, there is generated a flow that flows through the third flow path 203 in the vertical direction from the upper side to the lower side as shown by a broken line arrow f5 in
Then, in a state in which such a flow of plating liquid F is generated in the processing tank 91, a voltage is applied using the power supply portion 120 and the anode main body 121 of the anode device 93 as a positive electrode and using the workpiece support portion (not shown) and rod 10 as a negative electrode. In other words, a positive voltage is applied to the power supply portion 120 and the anode main body 121 of the anode device 93 via the power supply portion 120. At this time, in the anode device 93, the first surfaces 171 of all the rod-shaped members 131 become current-carrying surfaces. In this way, the plating liquid F is caused to flow in one direction through the first flow path 201 and the second flow path 202, and the rod 10 is plated. At this time, the plating liquid F is caused to flow into the first flow path 201 between the rod 10 and the first surfaces 171 of the plurality of rod-shaped members 131 of the anode main body 121 that face the rod 10. In other words, the plating liquid is caused to flow between the first surfaces 171 of the rod-shaped member 131 and the rod 10 with the first surfaces 171 facing the rod 10. At that time, the plating liquid F is caused to flow in and out between the second flow path 202 and the first flow path 201 via the gap 181 between the rod-shaped members 131 and the rod-shaped members 131 that are adjacent to each other in the circumferential direction of the anode main body 121. In other words, the gap 181 is provided between the adjacent rod-shaped members 131, the inner tube 101 is disposed on the outer peripheral side of the anode main body 121, and the second flow path 202 is provided between the anode main body 121 and the inner tube 101, and thus the plating liquid F is caused to flow in and out between the first flow path 201 and the second flow path 202 via the gap 181 between the plurality of rod-shaped members 131 while the plating liquid F is caused to flow in one direction through the first flow path 201 between the anode main body 121 and the rod 10. In this way, plating is electrodeposited on the surface of the rod 10 made of a metal to form a plating film.
In the embodiment, the rod 10 and the anode main body 121 are disposed to extend in the vertical direction, but the present invention is not limited to this and the rod 10 and the anode main body 121 may be disposed to extend in any direction. For example, the rod 10 and the anode main body 121 may be disposed to extend in the horizontal direction.
The above-described Patent Document 1 describes an anode that has a conductive outer tube portion and an inner tube portion made of platinum that is welded to be in contact with the inner surface of the outer tube portion. This anode is formed by stacking and welding a flat plate made of titanium and a flat plate made of platinum, and then bending them into a tubular shape with the flat plate made of platinum facing inside. If it is necessary to bend the anode into the tubular shape, it becomes difficult to ensure the thickness of the anode. As a result, a current-carrying area is reduced and a problem in durability occurs. Furthermore, since the anode is bent into the tubular shape, an internal stress tends to cause peeling between the inner and outer layers, and in this point, a problem in durability also occurs.
Here, the anode device for chromium plating generally uses titanium whose current-carrying surface is coated with a platinum layer from the viewpoint of conductivity and chromic acid resistance. The platinum layer is generally formed by either electrodeposition using platinum plating or welding of platinum foil. In this case, from the viewpoint of cost effectiveness, it is preferable to coat only the surface facing the object to be plated with a platinum layer. Among the platinum plating and the platinum foil, the platinum foil is denser and has fewer defects such as pinholes. For this reason, the platinum foil is less prone to deterioration such as electrolytic wear and interfacial peeling due to defects, and has superior durability than the platinum plating. As the shape of the anode device for high-speed plating, a cylindrical shape is employed in order to make the film thickness distribution uniform, but since it is extremely difficult to weld the platinum foil to the cylindrical surface, platinum plating (thickness 3 μm to 5 μm) is performed with respect to the platinum layer on the inner surface. For this reason, there was a problem that the platinum layer had a short life and had to be replaced frequently.
In contrast, in the rod manufacturing apparatus 81 and the anode device 93 of the present embodiment, the anode main body 121 is formed by arranging a plurality of rod-shaped members 131 in an annular shape. In the method for manufacturing the rod 10 of the present embodiment, the rod 10 is disposed inside the anode main body 121, and the plating liquid F is caused to flow in one direction through the first flow path 201 between the anode main body 121 and the rod 10, and thus the rod 10 is plated. In this way, since the anode main body 121 is formed by arranging the plurality of rod-shaped members 131 in the annular shape, the platinum layer 142 can be formed of platinum foil. Therefore, the durability of the anode main body 121 can be significantly improved, and in turn, the durability of the rod manufacturing apparatus 81 can be significantly improved. Further, in the rod manufacturing apparatus 81 and the anode device 93, since the anode main body 121 is formed by arranging the plurality of rod-shaped members 131 in the annular shape, the thickness of the anode main body 121 in the radial direction can be ensured. As a result, it is also possible to improve the durability of the anode main body 121. Further, in the rod manufacturing apparatus 81 and the anode device 93, since the thickness of the anode main body 121 in the radial direction can be ensured, the current-carrying area of the anode main body 121 can be increased. Therefore, durability can be improved even in the case of high-speed plating in which a current approximately 10 times larger than that of normal plating is applied. Further, in the rod manufacturing apparatus 81 and the anode device 93, the anode main body 121 is formed by arranging the plurality of rod-shaped members 131 in the annular shape. For this reason, even if deterioration such as peeling of the platinum layer 142 occurs in the rod-shaped member 131, only the deteriorated rod-shaped member 131 among the plurality of rod-shaped members 131 needs to be replaced. Therefore, the running cost of the anode main body 121 can be reduced.
Further, in the rod manufacturing apparatus 81 and the anode device 93 of the present embodiment, the rod-shaped member 131 has a rectangular column shape having the first surface 171 formed by the first side portions 161 and the second side portions 162 that are shorter than the first side portions 161 and made of platinum, and the second surface 172 formed by the third side portions 163 that are shorter than the first sides 161 and the second sides 162. Further, in the rod manufacturing apparatus 81, the first surface 171 of the rod-shaped member 131 faces the rod 10. In the method for manufacturing the rod 10 of the present embodiment, the plating liquid F is caused to flow between the first surface 171 of the rod-shaped member 131 and the rod 10 and the rod 10 is plated. Since the rod-shaped member 131 has the rectangular columnar shape, the platinum layer 142 can be easily formed from the platinum foil.
Further, in the rod manufacturing apparatus 81 and the anode device 93 of the present embodiment, the anode main body 121 provides the gap 181 between the adjacent rod-shaped members 131. In the method for manufacturing the rod 10 of the present embodiment, the plating liquid F is caused to flow in and out between the second flow path 202 between the anode main body 121 and the inner tube 101 and the first flow path 201 via the gap 181 while the plating liquid F is caused to flow in one direction through the first flow path 201 between the anode main body 121 and the rod 10. As a result, the effect of agitating the plating liquid F can be obtained, and concentration unevenness and temperature unevenness of the plating liquid F can be suppressed. Therefore, plating quality can be improved.
Moreover, since the upper end of the second flow path 202 does not open, the plating liquid F flowing through the second flow path 202 is guided to eventually merge into the flow of the first flow path 201 via the gap 181. In this way, the plating liquid F that has nowhere to go from the second flow path 202 flows into the first flow path 201 via the gap 181. For this reason, the effect of agitating the plating liquid F can be obtained to be further higher, and concentration unevenness and temperature unevenness of the plating liquid F can be further suppressed. Therefore, plating quality can be further improved.
Here, regarding the case where the rod 10 is plated using an anode main body having a polygonal tubular shape, a simulation of the formation of a plating film was performed by changing the number of corners. The results are shown in
The rod-shaped member 131 can also have the platinum layer 142 formed on the surface of the base 141 by plating platinum thereon. Also in this case, since the anode main body 121 is formed by arranging the plurality of rod-shaped members 131 in the annular shape, there is no need to bend the anode main body 121 after platinum plating. Therefore, generation of an internal stress in the anode main body 121 can be suppressed. For this reason, there is less concern that the adhesion of the platinum layer 142 will deteriorate. Furthermore, by roughening the surface of the base material 141 through pretreatment such as shot blasting, the adhesion of the platinum layer 142 can be improved. Therefore, the durability of the anode main body 121 can be improved, and in turn, the durability of the rod manufacturing apparatus 81 can be improved.
In this case, it becomes possible to easily plate the first surface 171 and the fourth surface 174 of the rod-shaped member 131 with platinum. With this configuration, in a case where the platinum plating on the first surface 171 of one rod-shaped member 131 is peeled off, this rod-shaped member 131 is rotated such that the fourth surface 174 faces the rod 10. In this way, the two first and fourth surfaces 171 and 174 of one rod-shaped member 131 can be disposed and used to face the rod 10 in turns. Therefore, the running cost of the anode main 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 are made to have the same shape and are plated with platinum, the running cost of the anode main body 121 can be further reduced.
According to the rod manufacturing method and the anode device of the above aspects of the present invention, it is possible to improve the durability of a device used. Therefore, the industrial applicability is great.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2021-170813 | Oct 2021 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2022/028614 | 7/25/2022 | WO |
