JP7703038B2 - Rod manufacturing method and anode device - Google Patents

Description

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, the contents of which are incorporated herein by reference.

There is an anode that has a conductive outer tube and an inner tube made of platinum that is welded to contact the inner surface of the outer tube (see, for example, Patent Document 1).

Japanese Patent Application Publication No. 2015-1005

In rod manufacturing methods in which plating is applied to rods, there is a demand for improving the durability of the equipment used.

Therefore, the present invention aims to provide a rod manufacturing method and an anode device that can improve the durability of the equipment used.

In order to achieve the above object, the present invention adopts the following aspects.
In other words, a rod manufacturing method according to one aspect of the present invention is a rod manufacturing method for plating a rod, and includes the steps of placing the rod within a first cylindrical body formed by arranging a plurality of rod-shaped members in a ring shape, and flowing a plating solution in one direction through a first flow path between the first cylindrical body and the rod to plate the rod.

In addition, an anode device according to one embodiment of the present invention has 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 rod and a rod arranged inside the first cylindrical body, and a positive voltage is applied.

According to each of the above aspects of the present invention, the durability of the equipment used can be improved.

1 is a front cross-sectional view of a cylinder device including a rod manufactured by a rod manufacturing method according to an embodiment of the present invention, taken along a cross section including a central axis line CL. FIG. 1 is a plan view that illustrates a rod manufacturing apparatus including an anode device according to an embodiment of the present invention. 1 is a front cross-sectional view that illustrates a schematic view of a rod manufacturing apparatus including an anode device according to an embodiment of the present invention. FIG. 2 is a plan cross-sectional view showing an anode body and a rod according to an embodiment of the present invention. FIG. 2 is a perspective view showing a rod-shaped member according to an embodiment of the present invention. 1 is a chart showing the results of simulating plating thickness when the anode body has a 4-15 corner shape and a cylindrical shape. FIG. 11 is a graph showing the results of simulating plating thickness when the anode body has a 4-15 corner shape and a cylindrical shape.

One embodiment of the present invention is described below with reference to the drawings.

First, a cylinder device 11 including a rod 10 manufactured by the manufacturing method of this embodiment will be described with reference to FIG.
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 railroad car. 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 tube 15 and an outer tube 16. The inner tube 15 is cylindrical. The outer tube 16 is cylindrical with a bottom. The outer tube 16 is provided on the outer periphery side of the inner tube 15 so as to cover the outer periphery of the inner tube 15. A reservoir chamber 18 is formed between the outer tube 16 and the inner tube 15.

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

One axial end of the inner cylinder 15 is fitted into the valve body 25. The inner cylinder 15 is engaged with the bottom 22 of the outer cylinder 16 via the valve body 25. The other axial end of the inner cylinder 15 is fitted into the rod guide 26. The inner cylinder 15 is engaged with the body 21 of the outer cylinder 16 via the rod guide 26. In this state, the inner cylinder 15 is positioned radially relative 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 22 is connected to 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 22 constitutes a reservoir chamber 18, as does the space between the inner cylinder 15 and the outer cylinder 16.

The cylinder device 11 has a seal member 41. The seal member 41 is annular and is provided closer to the opening 23 of the outer cylinder 16 than the rod guide 26. The seal member 41 is also fitted to the inner periphery of the body 21, similar to the rod guide 26. An engagement portion 43 is formed at the end of the body 21 on the opening 23 side. The engagement portion 43 is formed by plastically deforming the body 21 radially inward by crimping processing such as curling. The seal member 41 is sandwiched between the engagement 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. The seal member 41 may be configured as a seal washer.

The cylinder device 11 has a piston 45. The piston 45 is slidably fitted into the inner cylinder 15. The piston 45 divides 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 in the inner cylinder 15. The second chamber 49 is the portion between the piston 45 and the valve body 25 in the inner cylinder 15. The second chamber 49 is defined as the reservoir chamber 18 by the valve body 25. The first chamber 48 and the second chamber 49 are filled with oil liquid L as a working fluid. The reservoir chamber 18 is filled with gas G and oil liquid L as a working fluid.

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

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 circumferential 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. The mounting shaft portion 56 has a male thread 61 formed on its outer circumferential portion on the opposite side of the main shaft portion 55 in the axial direction. The piston 45 is fitted into the mounting shaft portion 56. The nut 51 is screwed into the male thread 61 of the mounting 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 axial end of the rod 10 is disposed inside the outer tube 16 and the inner tube 15, and the other end is disposed outside the outer tube 16 and the inner tube 15. The main shaft portion 55 of the rod 10 slides against the rod guide 26 on the outer peripheral surface. The rod 10 is guided by the rod guide 26 and moves axially together with the piston 45 relative to the inner tube 15 and the outer tube 16. The main shaft portion 55 of the rod 10 slides against the seal member 41 on the outer peripheral surface. The seal member 41 closes the gap between the outer tube 16 and the rod 10. The seal member 41 prevents the oil liquid L in the inner tube 15 and the oil liquid L and gas G in the reservoir chamber 18 from leaking out to the outside. The rod 10 has a threaded shaft portion 57 at a portion that protrudes outward from the cylinder 17 and the seal member 41 .

The piston 45 is formed with a passage 65 and a passage 66. The passages 65, 66 pass through the piston 45 in the axial direction of the piston 45. The passages 65, 66 can communicate 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 opposite side of the piston 45 from the bottom 22 in the axial direction. 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 22 side of the piston 45 in the axial direction. The disk valve 68 is annular, and closes the passage 66 by abutting against the piston 45.

The direction in which the rod 10 increases its penetration into the inner tube 15 and the outer tube 16 is the compression side. When the rod 10 moves to the compression side, the piston 45 moves in a direction that narrows 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 disc valve 67 opens the passage 65 to allow the oil L in the second chamber 49 to flow into the first chamber 48. At that time, the disc valve 67 generates a damping force.

The direction in which the rod 10 increases its protrusion from the inner tube 15 and the outer tube 16 is the extension side. When the rod 10 moves in the extension side, the piston 45 moves in a direction that narrows 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 disc valve 68 opens the passage 66 to allow the oil L in the first chamber 48 to flow into the second chamber 49. At that time, the disc valve 68 generates a damping force.

At least one of the piston 45 and the disk valve 67 has a fixed orifice (not shown). This fixed orifice allows the first chamber 48 to communicate with the second chamber 49 through the passage 65 even when the disk valve 67 is in a state where the passage 65 is most blocked by the disk valve 67. At least one of the piston 45 and the disk valve 68 has a fixed orifice (not shown). This fixed orifice allows the first chamber 48 to communicate with the second chamber 49 through the passage 66 even when the disk valve 68 is in a state where the passage 66 is most blocked by the disk valve 68.

The valve body 25 is formed with a fluid passage 71 and a fluid passage 72. The fluid passages 71, 72 pass through the valve body 25 in the axial direction of the valve body 25. The fluid passages 71, 72 can connect the second chamber 49 and the reservoir chamber 18 to each other.
The body valve 30 has a disk valve 75. The disk valve 75 is provided on the bottom portion 22 side in the axial direction of the valve body 25. The disk valve 75 has an annular shape, and closes the liquid passage 71 by abutting against the valve body 25.

The body valve 30 also has a disc valve 76. The disc valve 76 is provided on the opposite side of the valve body 25 from the bottom 22 in the axial direction. The disc 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 disc valves 75, 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: a second chamber 49 and a reservoir chamber 18.

When the rod 10 moves to the contraction side, the piston 45 moves in a direction narrowing 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 disc valve 75 of the body valve 30 opens the fluid passage 71 to allow the oil L in the second chamber 49 to flow into the reservoir chamber 18. At that time, the disc valve 75 generates a damping force. When the rod 10 moves to the extension side, the piston 45 moves to the first chamber 48 side. As a result, when the pressure in the second chamber 49 becomes lower than the pressure in the reservoir chamber 18, the disc valve 76 of the body valve 30 opens the fluid passage 72 to allow the oil L in the reservoir chamber 18 to flow into the second chamber 49. At that time, the disc valve 76 allows the oil L to flow from the reservoir chamber 18 into the second chamber 49 without generating any substantial damping force. The disc valve 76 is a suction valve.

The cylinder device 11, for example, has a rod 10 connected to the body side of the vehicle and a cylinder 17 connected to the wheel side of the vehicle, generating a damping force against the movement of the wheel relative to the body.

Next, the manufacturing method of the rod 10 and the rod manufacturing apparatus 81 of this embodiment will be described below. In the manufacturing method of the rod 10 of this embodiment, plating is applied to the rod 10. Specifically, in the manufacturing method of the rod 10 of this embodiment, chrome plating is applied to the surface of the steel rod 10.

2 and 3, the rod manufacturing apparatus 81 of this embodiment has a treatment tank 91 and an anode device 93. The treatment tank 91 has an inner cylinder 101 (second cylindrical body) and an outer cylinder 102. The reference character CL shown in each drawing indicates a central axis shared by each part.
The inner cylinder 101 is cylindrical with a bottom. The inner cylinder 101 has a central axis CL that is aligned vertically. 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 is cylindrical with a bottom. The central axis CL of the outer cylinder 102 is vertical. The inner diameter of the outer cylinder 102 is larger than the outer diameter of the inner cylinder 101. The central axes CL of the inner cylinder 101 and the outer cylinder 102 are aligned. A liquid discharge port 112 is provided at the lower end of the outer cylinder 102, which opens between the inner cylinder 101 and the outer cylinder 102. The liquid discharge port 112 opens upward.

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. This causes the rod 10 to be supported by the work support portion. The rod 10 supported by the work support portion is arranged so as to be aligned vertically within the inner tube 101. Moreover, the rod 10 is arranged coaxially with the inner tube 101.

The anode device 93 has a power supply section 120 and an anode body 121 (first cylindrical body).
The power supply unit 120 is flat and made of a conductive material. The power supply unit 120 is disposed horizontally and attached to the upper ends of the inner cylinder 101 and the outer cylinder 102. In the anode device 93, a positive voltage is applied to the power supply unit 120.
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 peripheral 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.

The anode body 121 has a plurality of (specifically, eight) rod-shaped members 131 as shown in FIG. 4. These rod-shaped members 131 are supported by the inner cylinder 101 and the outer cylinder 102 via the power supply unit 120 and are arranged in a ring shape as shown in FIG. 4. In other words, the anode body 121 is formed by arranging a plurality of rod-shaped members 131 in a ring shape. Since the anode body 121 is formed by arranging a plurality of rod-shaped members 131 in a ring shape in this manner, it has a cylindrical shape overall. The rod 10 supported by the inner cylinder 101 and the outer cylinder 102 via the work support unit (not shown) is arranged in the anode body 121 as shown in FIGS. 3 and 4.

The multiple rod-shaped members 131 that make up the anode body 121 are all common parts with the same shape and configuration. As shown in Figure 5, the rod-shaped members 131 are rectangular parallelepiped shaped. The rod-shaped members 131 have a base material 141 and a platinum layer 142.

The substrate 141 in this embodiment has a rectangular parallelepiped shape. The substrate 141 is made of a conductive material such as titanium. The substrate 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 portions 151 and 152 are all flat surfaces and have the same rectangular shape. The surface portions 151 and 152 are parallel to each other and face in opposite directions. The surface portions 153 and 154 are all flat surfaces. The flat surfaces of the substrate 141 are not limited to being rectangular, but may be square. The surface portions 153 and 154 are parallel to each other and face in opposite directions. The surface portions 155 and 156 are all flat surfaces and have the same rectangular shape. The surface portions 155 and 156 are parallel to each other and face in opposite directions. The surfaces 151 and 152 have a larger area than the surfaces 153 and 154, and a larger area than the surfaces 155 and 156. The surfaces 155 and 156 are located at the ends of the base material 141 in the longitudinal 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 substrate 141. In other words, the rod-shaped member 131 forms the platinum layer 142 by welding platinum foil to the surface portion 151, which is the surface of the substrate 141. The platinum layer 142 is formed so as to cover the entire surface portion 151 of the substrate 141.

The rod-shaped member 131 has two first sides 161 , two second sides 162 , four third sides 163 , two fourth sides 164 , and two fifth sides 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 bar-shaped member 131.
The two second side portions 162 have the same length and are provided on the platinum layer 142. The second side portions 162 are shorter than the first side portions 161. One of the two second side portions 162 connects one end portion of the two first side portions 161 on the same side in the length direction. The other of the two second side portions 162 connects the other end portions of the two first side portions 161 on the opposite side in the length direction to the one end portion.
A portion surrounded by the two first side portions 161 and the two second side portions 162 constitutes 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 are all the same length, and extend from the four corners of the first surface 171 perpendicularly to the first surface 171. The third side portions 163 are shorter than the first side portions 161 and shorter than the second side portions 162. The third side portions 163 are the shortest side portions of the rod-shaped member 131.
The two fourth side portions 164 each have the same length as the first side portion 161 and are both parallel to the first side portion 161 .
The two fifth side portions 165 both have the same length as the second side portion 162 and are both parallel to the second side portion 162 .

The portion surrounded by one of the two second sides 162, the two adjacent third sides 163, and the fifth side 165, which is adjacent to and continuous with the second side 162, constitutes the second surface 172. The portion surrounded by the other of the two second sides 162, the two adjacent third sides 163, and the fifth side 165, which is adjacent to and continuous with the second side 162, constitutes the 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 longitudinal direction.

A portion surrounded by one of the two first side portions 161, two third side portions 163 adjacent to and continuous with the first side portion 161, and a fourth side portion 164 adjacent to and continuous with the first side portion 161 and the fourth side portion 164 also constitutes a third surface 173. A portion surrounded by the other of the two first side portions 161, two third side portions 163 adjacent to and continuous with the first side portion 161, and a fourth side portion 164 adjacent to and continuous with the first side portion 161 and the fourth side portion 164 also constitutes a 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 constitutes 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 material 141.

The anode body 121 in the attached state, which is attached to the inner tube 101 and the outer tube 102 via the power supply unit 120, is arranged in a circular ring shape so that all the rod-shaped members 131 are in line contact with the same imaginary cylindrical surface C at the first surface 171 made of the platinum layer 142, as shown in FIG. The anode body 121 in the attached state is arranged so that the central axis CL of this imaginary cylindrical surface C coincides with the central axis of the rod 10 supported by the work support part not shown. In the attached anode body 121, all the rod-shaped members 131 have their first surfaces 171 in contact with this imaginary cylindrical surface C facing the rod 10 supported by the work support part not shown. The first surfaces 171 in contact with the imaginary cylindrical surface C of all the rod-shaped members 131 extend perpendicular to the radial direction of the rod 10 supported by the work support part not shown.

In the attached anode body 121, all of the rod-shaped members 131 have the first side portion 161 and the fourth side portion 164 shown in Fig. 5 aligned in the vertical direction, and the second side portion 162, the third side portion 163 and the fifth side portion 165 aligned in the horizontal direction. In the attached anode body 121, all of the rod-shaped members 131 have the second side portion 162 as a tangent to the imaginary cylindrical surface C described above.
In the attached anode body 121, all of the rod-shaped members 131 are aligned in the axial direction of the imaginary cylindrical surface C. In the attached anode body 121, all of the rod-shaped members 131 are arranged at equal intervals in the circumferential direction of the imaginary cylindrical surface C. In the attached anode body 121, all of the rod-shaped members 131 are arranged such that gaps 181 are formed between adjacent rod-shaped members 131 in the circumferential direction of the imaginary cylindrical surface C. The attached anode body 121 is arranged coaxially with the inner cylinder 101 and the outer cylinder 102.
The anode body 121 is formed by arranging multiple rod-shaped members 131 made of square bars in a ring shape, and therefore has an overall polygonal (specifically, regular octagonal) tubular shape, and is generally cylindrical.

The circumferential direction of the imaginary cylindrical surface C is the circumferential direction of the anode body 121, which is generally cylindrical as a whole. The axial direction of the imaginary cylindrical surface C is the axial direction of the anode body 121. The radial direction of the imaginary cylindrical surface C is 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. The gap 181 penetrates the anode body 121 in the radial direction of the anode body 121. The width of the 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 body 121.
The space between the upper end of the inner cylinder 101 and the upper end of the anode body 121 shown in FIG. 3 is closed by a pair of lids 185 and a power supply unit 120 shown in FIG.

In the rod manufacturing device 81, the rod 10 attached to a work support portion (not shown) is inserted into the radial inside of the anode body 121 as shown in FIG. 3. In other words, the rod 10 is disposed in the anode body 121. In this state, the rod 10 is disposed coaxially with the anode body 121. In this state, the space between the anode body 121 and the rod 10 forms a first flow path 201. The first flow path 201 is a space formed between the rod 10 disposed 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 to the upper surface of the power supply portion 120.
As shown in FIG. 3, the second flow path 202 is formed between the anode body 121 and the inner cylinder 101. In other words, the inner cylinder 101 is disposed on the outer periphery 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 below the lower end positions of the rod 10 and the anode body 121. As a result, the first flow path 201 and the second flow path 202 communicate with each other at the lower part. The liquid inlet 111 opens in this communication part. Also, as shown in FIG. 4, the first flow path 201 and the second flow path 202 communicate with each other through a gap 181. The upper end of the inner cylinder 101 and the upper end of the anode body 121 shown in FIG. 3 are blocked by the pair of lids 185 and the power supply unit 120 shown in FIG. 2, so that 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 third flow path 203 has an open upper end. A liquid discharge port 112 is opened at a lower end of the third flow path 203.

In the rod manufacturing device 81, 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 outlet 112 by a pump not shown. Then, in the plating solution F in the treatment tank 91, a flow from the bottom to the top along the vertical direction in the first flow path 201 as shown by the dashed arrow f1 in FIG. 3, and a flow from the bottom to the top along the vertical direction in the second flow path 202 as shown 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 multiple rod-shaped members 131 of the anode body 121 and the rod 10. In other words, the cylindrical anode body 121 forms a space in which the plating solution F flows between the rod 10 arranged inside.

Here, the plating solution F flowing from bottom to top in the first flow path 201 as shown by the dashed arrow f1 flows out from the upper end of the first flow path 201, which is open, 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 cover unit 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, an annular guide 205 such as a seal ring is provided on the upper surface side of the power supply unit 120 and the outer cylinder 102 to regulate the flow of the plating solution F so that the plating solution F does not pass the outer cylinder 102 radially outward and guide the plating solution F to the third flow path 203. Note that the guide 205 may be provided at least on the upper surface of the power supply unit 120. In addition, 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 with the first flow path 201 through the gap 181, 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, as shown by the dashed arrow f4 in Fig. 4. 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.
The plating solution F introduced into the third flow path 203 is caused to flow vertically from the top to the bottom through the third flow path 203, as indicated by dashed arrow f5 in FIG. 3, by suction from a pump (not shown).

Then, with such a flow of plating solution F occurring in the treatment tank 91, a voltage is applied to the power supply unit 120 and the anode body 121 of the anode device 93 as the anode, and the work support unit and the rod 10 (not shown) as the cathode. 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, the first surfaces 171 of all the rod-shaped members 131 of the anode device 93 become the current-carrying surfaces. In this way, 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, plating solution F is caused to flow through the first flow path 201 between the first surfaces 171 of the multiple rod-shaped members 131 of the anode body 121 that face the rod 10 and the rod 10. In other words, the plating solution is flowed between the first surface 171 and the rod 10 while the rod-shaped member 131 is facing 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 the rod-shaped members 131 adjacent to each other in the circumferential direction of the anode body 121. In other words, the gap 181 is provided between the adjacent rod-shaped members 131, the inner cylinder 101 is disposed on the outer circumferential side of the anode body 121 to provide the second flow path 202 between the anode body 121 and the inner cylinder 101, and while the plating solution F flows 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 multiple rod-shaped members 131. In this way, plating is electrodeposited on the surface of the metal rod 10 to form a plating film.

In the embodiment, the rod 10 and the anode body 121 are arranged to extend vertically, but this is not limited thereto 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 horizontally.

The above-mentioned Patent Document 1 describes an anode having an electrically conductive outer tube and an inner tube made of platinum welded to the inner surface of the outer tube. This anode is formed by overlapping and welding a flat titanium material and a flat platinum material, and then bending them into a cylindrical shape with the flat platinum material on the inside. If it is necessary to bend it into a cylindrical shape, it becomes difficult to ensure the thickness of the anode. This reduces the current-carrying area and creates durability issues. In addition, because it is bent into a cylindrical shape, internal stress easily causes peeling between the inner and outer layers, which also creates durability issues.

Here, in terms of electrical conductivity and chromium resistance, titanium is generally used for the anode device for chrome plating, with a platinum layer coated on the current-carrying surface. The platinum layer is generally formed by either platinum plating electrodeposition or platinum foil welding. In this case, from the viewpoint of cost-effectiveness, it is better to coat only the surface facing the plated object with the platinum layer. In addition, platinum foil is denser and has fewer defects such as pinholes than platinum plating. For this reason, platinum foil is less susceptible to deterioration such as electrolytic wear and interface peeling through defects, and is more durable than platinum plating. A cylindrical shape is adopted as the shape of the anode device for high-speed plating in order to achieve a uniform film thickness distribution, but since it is very difficult to weld platinum foil to the cylindrical surface, the platinum layer on the inner surface is platinum plated (thickness 3 μm to 5 μm). 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 this embodiment, the anode body 121 is formed by arranging a plurality of rod-shaped members 131 in a ring shape. In the manufacturing method of the rod 10 of this embodiment, the rod 10 is arranged in the anode body 121, and plating solution F is flowed in one direction through the first flow path 201 between the anode body 121 and the rod 10 to plate the rod 10. In this way, since the anode body 121 is formed by arranging a plurality of rod-shaped members 131 in a ring shape, it is 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. In addition, in the rod manufacturing apparatus 81 and the anode device 93, since the anode body 121 is formed by arranging a plurality of rod-shaped members 131 in a ring shape, the radial thickness of the anode body 121 can be secured. This also improves the durability of the anode body 121. In addition, the rod manufacturing device 81 and the anode device 93 can ensure the radial thickness of the anode body 121, so that 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 larger than that of normal plating is applied, durability can be improved. In addition, in the rod manufacturing device 81 and the anode device 93, the anode body 121 is formed by arranging a plurality of rod-shaped members 131 in an annular shape. Therefore, even if the rod-shaped member 131 is deteriorated, such as the platinum layer 142 peeling off, 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.

In addition, in the rod manufacturing apparatus 81 and the anode device 93 of this embodiment, the rod-shaped member 131 has a rectangular prism shape having a first surface 171 formed of a first side portion 161 and a second side portion 162 shorter than the first side portion 161 and made of platinum, and a second surface 172 formed of a third side portion 163 shorter than the first side portion 161 and the second side portion 162. In addition, the rod manufacturing apparatus 81 faces the first surface 171 of the rod-shaped member 131 to the rod 10. In the manufacturing method of the rod 10 of this embodiment, plating solution F is flowed between the first surface 171 of the rod-shaped member 131 and the rod 10 to plate the rod 10. Since the rod-shaped member 131 has a rectangular prism shape, it is easy to form the platinum layer 142 with platinum foil.

In addition, in the rod manufacturing apparatus 81 and anode apparatus 93 of this embodiment, the anode body 121 has a gap 181 between adjacent rod-shaped members 131. In the manufacturing method of the rod 10 of this embodiment, the plating solution F flows in one direction through the first flow path 201 between the anode body 121 and the rod 10, while the plating solution F flows in and out between the second flow path 202 between the anode body 121 and the inner tube 101 and the first flow path 201 through the gap 181. This provides the effect of stirring the plating solution F, and can suppress unevenness in the concentration and temperature of the plating solution F. Therefore, the plating quality can be improved.

Moreover, because the second flow path 202 does not have an open upper end, the plating solution F flowing through the second flow path 202 is ultimately guided to merge with the first flow path 201 through the gap 181. In this way, the plating solution F that has nowhere to go from the second flow path 202 flows into the first flow path 201 through the gap 181. This further enhances the effect of stirring the plating solution F, and further suppresses unevenness in the concentration and temperature of the plating solution F. This further improves the plating quality.

Here, a simulation of plating film formation was performed by varying the number of corners when plating rod 10 using a polygonal cylindrical anode body. The results are shown in Figures 6 and 7. Here, the inner diameter of the imaginary cylindrical surface C was set to φ50 (mm), and the outer diameter of rod 10 was set to φ22 (mm). Figures 6 and 7 show plating film thicknesses at multiple positions around rod 10 for a case where the anode body is a polygon with 4 to 15 corners and a case where the anode body is cylindrical. In Figure 6, "max" indicates the maximum value of plating film thickness, "min" indicates the minimum value of plating film thickness, "σ" indicates the standard deviation, and "Cp" indicates the process capability index. In Figure 7, the vertical axis indicates plating film thickness and standard deviation, the range from the left to the middle of the horizontal axis indicates the number of corners, and the right end of the horizontal axis indicates the case of a cylinder. From these results, it can be seen that if the anode body has a polygonal shape with seven or more sides, the variation in plating film thickness can be suppressed to the same level as that of a cylinder.

The rod-shaped member 131 can also have the platinum layer 142 formed by platinum plating the surface of the base material 141. In this case, the anode body 121 is formed by arranging a plurality of rod-shaped members 131 in a ring shape, so there is no need to bend the anode body 121 after platinum plating. This can suppress the generation of internal stress in the anode body 121. This reduces the concern about a decrease in adhesion of the platinum layer 142. Moreover, the adhesion of the platinum layer 142 can be improved by roughening the surface of the base material 141 through pretreatment such as shot blasting. This can improve the durability of the anode body 121, and therefore the durability of the rod manufacturing device 81.

In this case, it is easy to apply platinum plating to the first surface 171 and the fourth surface 174 of the rod-shaped member 131. With this configuration, if the platinum plating of the first surface 171 of one rod-shaped member 131 peels off, the rod-shaped member 131 is rotated so that the fourth surface 174 faces the rod 10. In this way, the two first surfaces 171 and the fourth surface 174 of one rod-shaped member 131 can be arranged to face the rod 10 in turn and used. 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 are made to have the same shape and are platinum plated, the running cost of the anode body 121 can be further reduced.

The rod manufacturing method and anode device according to the above aspects of the present invention can improve the durability of the device used. Therefore, the industrial applicability is high.

10...rod, 93...anode device, 101...inner cylinder (second cylinder), 121...anode main 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 (4)

A method for manufacturing a rod by plating the rod, comprising the steps of:
a step of disposing the rod within a first cylindrical body formed by disposing a plurality of rod-shaped members in an annular shape;
and a step of plating the rod by flowing a plating solution in one direction through a first flow path between the first cylindrical body and the rod,
The rod-shaped member has a rectangular prism shape having a first surface facing the rod, a second surface parallel to the first surface and facing in an opposite direction, and a third surface and a fourth surface connecting the first surface and the second surface,
a platinum layer is coated on the first surface and at least one other surface;
In the event of deterioration of the platinum layer on the first surface, another platinum layer can be substituted for the coated surface.
A method for manufacturing a rod. the rod-shaped member has a quadrangular prism shape having a first surface formed by a first side portion and a second side portion shorter than the first side portion and 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 caused to flow between the first surface and the rod.
A method for manufacturing the rod according to claim 1 . A gap is provided between adjacent rod-shaped members,
a second cylinder is disposed on an outer circumferential side of the first cylinder, and a second flow path is provided between the first cylinder and the second cylinder;
3. The method for manufacturing a rod according to claim 1, wherein the plating solution is caused to flow in one direction through the first flow path between the first cylinder and the rod, while the plating solution flows in and out between the first flow path and the second flow path through the gap. An anode device to which a positive voltage is applied, the anode device having a plurality of rod-shaped members arranged in a ring shape to form a first cylindrical body and thereby forming a space through which a plating solution flows between the rod-shaped members and a rod arranged inside the first cylindrical body,
The rod-shaped member has a rectangular prism shape having a first surface facing the rod, a second surface parallel to the first surface and facing in an opposite direction, and a third surface and a fourth surface connecting the first surface and the second surface,
a platinum layer is coated on the first surface and at least one other surface;
In the event of deterioration of the platinum layer on the first surface, another platinum layer can be substituted for the coated surface .
Anode device.

Images