JP2019126146A - Electroplating apparatus, electrode for electroplating and stator coil assembly method - Google Patents

Abstract

To perform high-quality plating in which a thickness of a plating film is stable without much labor.SOLUTION: The electroplating apparatus according to the embodiment comprises: a mounting portion 21 which forms a sealed space 22 together with a box-like body 13 when mounted on the box-like body 13; a plating solution container 32; an acid aqueous solution container 31; a water container 30; a supply pipe 33 connected to the mounting portion 21; a supply switching valve 34 configured to selectively supply the plating solution, the acid aqueous solution and the water to the sealed space 22; a supply pump 35 which pressurizes the plating solution, the acid aqueous solution and the water and sends them to the sealed space 22; a return pipe 36 connected to the mounting portion 21;a return switching valve 37 for switching the plating solution, the acid aqueous solution, and the water in the sealed space 22 to return respectively; and an electrode 25 attached to the mounting portion 21 and extending toward the plating target in the sealed space 22 and connected to a DC power source 28 outside the sealed space 22.SELECTED DRAWING: Figure 1

Description

  Embodiments of the present invention relate to an electroplating apparatus, an electrode for electroplating, and a method of assembling a stator coil using the same.

  As a structure of a stator coil of a rotating electric machine such as a large generator, there is known a structure in which ends of strands of a stator coil are bundled in a grid shape and brazed and connected to a water supply / drain box (clip). In this case, a part of the strands of the stator coil has a hollow structure, and water is allowed to flow through the water supply / drain box to cool the hollow part of the strands of the stator coil.

  In the said structure, in order to suppress corrosion of a brazed part, the technique of metal-plating is known.

JP, 2006-144125, A

  In the above-described conventional techniques, there are problems such as difficulty in pretreatment of plating, instability of thickness of plating film, and time-consuming replacement of electrodes because the electrode for plating is dissolved.

  An embodiment of the present invention solves such a problem, and an electroplating apparatus for performing high-quality plating in which the thickness of a plating film is stable, an electrode for electroplating, and a stator without requiring much labor. It aims at realizing a coil assembly method.

  The electroplating apparatus according to the embodiment is an electroplating apparatus that performs electroplating on at least a part of a plating target portion inside a box-shaped body having a box-shaped body opening, which can be detachably attached to the box-shaped body opening A mounting portion that forms a sealed space with the box-like body when mounted, a plating solution container for storing a plating solution, and an aqueous acid solution container for storing an aqueous acid solution for cleaning the surface of the plating target portion And a water container for storing water, connected to the mounting unit, and supplying the plating solution in the plating solution container, the acid aqueous solution in the acid aqueous solution container, and the water in the water container to the sealed space And one of the plating solution in the plating solution container, the aqueous acid solution in the aqueous acid solution container, and the water in the water container. Switch to supply the sealed space Supply switching valve, and the supply pipe connected to supply the plating solution in the plating solution container, the acid aqueous solution in the acid aqueous solution container, and the water in the water container to the pressurized space to be sent to the sealed space Connected to the pump and the mounting unit, the plating solution, the aqueous acid solution and the water in the sealed space are respectively returned to the plating solution container, the aqueous acid solution container and the water container, and the return piping and the return piping. And a return switching valve for switching the plating solution, the acid aqueous solution and the water in the enclosed space back to the plating solution container, the acid aqueous solution container and the water container, and And an electrode which extends toward the plating target in the enclosed space and is connectable to a power supply outside the enclosed space.

  A stator coil assembling method according to an embodiment is a method for assembling a stator coil of a water-cooled electric rotating machine, in which a plurality of coil strands including at least one hollow coil strand are aligned in parallel to each other A step of brazing the ends of the strands of wire and brazing the coil strand and the water supply and drainage box into a brazed body, and plugging the wire openings of the hollow coil strands in the water supply and drainage box A closing step for closing the wire opening by pressing and attaching a mounting portion to which the electrode is attached to the water supply and drainage box, and sealing by the water supply and drainage box, the plurality of coil wires, the plug and the mounting portion A mounting step of forming a space, and after the mounting step, a pre-cleaning step of supplying water into the sealed space to clean the inside of the sealed space, and after the pre-cleaning step, And supplying a plating solution into the sealed space and supplying electricity to the electrode after the surface treatment step of supplying an aqueous acid solution into the sealed space to perform surface treatment of the inside of the brazed body and the surface treatment step. The method further comprises the steps of: plating the inside of the brazing body with electroplating; and removing the mounting portion and the plug after the plating.

  Further, the electrode for electroplating according to the embodiment includes a conductive shaft member extending in the axial direction, and a conductive tip member attached to the tip of the shaft member and electrically connected to the shaft member. The operating member attached to the shaft member at a position away from the front end of the shaft member, and the distal end member are operated according to the operation of the operating member so that the tip member is elongated in the axial direction It is characterized by having a link mechanism constituted so that two states, a diameter state and a developed state developed in the direction perpendicular to the direction of an axis, can be realized.

It is a whole block diagram which shows the state which attached the electroplating apparatus to the water supply and drainage box in the process of performing the stator coil assembly method which concerns on the 1st Embodiment of this invention. It is a typical longitudinal cross-sectional view which shows the state immediately after attaching the mounting part of FIG. 1 to a water supply and drainage box. It is a typical longitudinal section showing the situation of the stator coil end and the plumbing box immediately after the completion of the brazing step of the stator coil assembling method concerning the 1st embodiment of the present invention. It is a flow figure showing the procedure of the stator coil assembling method concerning a 1st embodiment of the present invention. It is a schematic longitudinal cross-sectional view which shows the condition just before a closure step after the mounting step of the stator coil assembly method which concerns on the 2nd Embodiment of this invention. It is a typical longitudinal section showing the situation immediately after the closure step of the stator coil assembling method concerning a 2nd embodiment of the present invention. It is a longitudinal cross-sectional view which expands and shows vicinity of the front-end | tip part of the electrode of FIG. 5, and a stopper. It is a whole block diagram which shows the state which attached the electroplating apparatus to the water supply and drainage box in the process of performing the stator coil assembly method which concerns on the 3rd Embodiment of this invention. It is a schematic longitudinal cross-sectional view which shows the state which attached the mounting part to the water supply and drainage box in the process of performing the stator coil assembly method which concerns on the 4th Embodiment of this invention. It is a figure which shows the front-end | tip part of the electrode in the stator coil assembly method which concerns on the 4th Embodiment of this invention, Comprising: It is a XX arrow directional view of FIG. It is a typical longitudinal section showing the state immediately after attaching a mounting part to a plumbing box in the process which performs the stator coil assembling method concerning a 5th embodiment of the present invention. It is a typical longitudinal section showing the state where the tip part of the electrode was developed after attaching a mounting part to a plumbing box in the process of performing the stator coil assembling method concerning a 5th embodiment of the present invention. It is a typical longitudinal section showing the state immediately after attaching a mounting part to a plumbing box in the process which performs the stator coil assembling method concerning a 6th embodiment of the present invention. It is a typical longitudinal section showing the state where the tip part of the electrode was developed after attaching a mounting part to a plumbing box in the process of performing the stator coil assembling method concerning a 6th embodiment of the present invention.

  An embodiment of an electroplating apparatus, an electrode for electroplating and a method of assembling a stator coil according to the present invention will be described below with reference to the drawings. Here, parts that are the same as or similar to each other are given the same reference numerals, and redundant descriptions are omitted.

First Embodiment
FIG. 1 is an overall configuration diagram showing a state in which an electroplating apparatus is attached to a water supply and drainage box in the course of performing a stator coil assembly method according to a first embodiment of the present invention. FIG. 2 is a schematic vertical sectional view showing a state immediately after the mounting portion of FIG. 1 is attached to the water supply and drainage box. FIG. 3 is a schematic vertical sectional view showing the condition of the stator coil end and the water supply / drain box immediately after the completion of the brazing step of the stator coil assembling method according to the first embodiment of the present invention. FIG. 4 is a flow chart showing the procedure of the stator coil assembling method according to the first embodiment of the present invention.

  The stator coil 10 according to this embodiment is, for example, a stator coil used in a large generator, and a plurality of coil wires 11 are arranged in parallel to one another. The coil wire 11 is conductive and preferably made of copper. All or part of the plurality of coil strands has a hollow structure, and cooling water can be allowed to flow through the hollow portion. The ends of the coil wires 11 are arranged in a square grid and brazed by a brazing material 14 to a water supply / drain box (box-like body) 13 made of a conductive material. A wire opening 15 is formed at an end of the hollow coil wire 11, and the hollow portion of the hollow coil wire communicates with the inside of the water supply and drainage box 13. Here, “brazing material” includes “solder”, and “brazing” includes “soldering”.

  A box opening (box-like body opening) 16 is formed in the water supply and drainage box 13 in order to connect a cooling water pipe (not shown).

  In the stator coil assembling method according to this embodiment, the removable plug 20 is attached to the wire opening 15 to close the wire opening 15, and the detachable opening 21 is attached to the box opening 16. The sealed space 22 is formed by the water supply and drainage box 13, the mounting portion 21, the plug 20, and the like. The periphery of the plug 20 is covered with a hot melt adhesive (not shown) to make it liquid tight. The plug 20 is made of metal, and the hot melt adhesive is, for example, a polyester adhesive.

  An electrode 25 is attached to the mounting portion 21 through the mounting portion 21. The electrode 25 includes a straight pipe portion 26, a tip portion 27, and a conductive portion 92. The straight pipe portion 26 is made of an insulating material having chemical resistance such as resin, ceramic or the like, extends linearly and penetrates the mounting portion 21. The tip portion 27 is made of a metal nobler than the metal element to be plated, is attached to the tip of the straight pipe portion 26, and has a disk shape extending in a plane perpendicular to the axial direction of the straight pipe portion 26. The distal end portion 27 is disposed in the water supply and drainage box 13 and extends toward the end of the coil wire 11. The distal end portion 27 is provided with an opening for spouting the liquid flowing from the straight pipe portion 26 toward the end of the coil wire 11. Thereby, the in-electrode flow passage 50 is formed.

  The conductive portion 92 extends through the mounting portion 21 along the straight pipe portion 26 and is electrically connected to the distal end portion 27. For the conductive portion 92, for example, a wire coated with an acid resistant resin is used. In the example shown in FIG. 2, the conductive portion 92 extends along the outside of the straight pipe portion 26, but may be embedded inside the thick portion of the straight pipe portion 26. In that case, the coating of the wire may be omitted.

  The conductive portion 92 of the electrode 25 is electrically connected to the anode of a DC power source (power source) 28 disposed outside the mounting portion 21. Here, although the power supply is a direct current power supply, a power supply using an alternating current may be used.

  A water container 30 storing pure water, an acid aqueous solution container 31 storing an acid aqueous solution, and a plating solution container 32 storing a plating solution are disposed outside the mounting portion 21. Furthermore, the pure water in the water container 30, the acid aqueous solution in the aqueous acid solution container 31, and the plating solution in the plating solution container 32 are sequentially switched to supply one of the liquids into the sealed space 22. The supply pipe 33, the supply switching valve 34, and the supply pump 35 are disposed outside the mounting portion 21 and connected to the mounting portion 21.

  In addition, there are a return pipe 36, a return switching valve 37, and a return pump 38 for returning the pure water, the acid aqueous solution and the plating solution in the enclosed space 22 to the water container 30, the acid aqueous solution container 31 and the plating solution container 32 at respective timings. It is arranged and connected to the mounting unit 21. However, the return pump 38 can be omitted.

  The aqueous acid solution is for cleaning (pre-cleaning) the inner surface of the enclosed space 22 before plating. As the aqueous acid solution, for example, dilute sulfuric acid is used.

  The plating solution is a solution containing ions of the metal (eg, copper) to be plated, for example, a copper sulfate solution.

  In addition, although the supply switching valve 34 and the return switching valve 37 are each displayed as one multi-directional switching valve in FIG. 1, each can be realized by a plurality of on-off valves (not shown). .

  Furthermore, a dryer 40 for sending dry air into the enclosed space 22 to dry the inside of the water supply and drainage box 13 is connected to the mounting unit 21. Further, a concentration measuring device 41 for measuring the concentration of the plating solution in the enclosed space 22 is connected to the mounting portion 21.

  Next, the procedure of the stator coil assembling method according to the first embodiment will be described with reference to FIG.

  First, the ends of a plurality of coil strands 11 including hollow coil strands are arranged parallel to one another in a square grid shape and brazed to the water supply and drainage box 13 with the brazing material 14 to form a brazing body 44 Attaching step S10). At that time, brazing is also performed between the coil wires 11. Thus, the entire surface of the end of the coil wire 11 is covered with the brazing material 14. The situation immediately after this brazing step S10 is shown in FIG.

  Next, the plug 20 is inserted into the wire opening 15 at the end of the coil wire 11 from the water supply / drain box 13 side to close the wire opening 15 (closing step S11). Cover the plug 20 with hot melt adhesive and make it liquid tight.

  Next, the mounting portion 21 is mounted on the box opening 16 of the water supply / drain box 13 to configure the entire electroplating apparatus shown in FIG. 1 (mounting step S12). Thereafter, each step up to the drying step S18 described later is performed with the configuration shown in FIG.

  After the mounting step S12, by switching the supply switching valve 34 and the return switching valve 37, pure water in the water container 30 is boosted by the supply pump 35 and sent into the sealed space 22 through the supply piping 33. The pure water in the enclosed space 22 is pressurized by the return pump 38 and returned to the water container 30 through the return pipe 36. A leak test of the brazed portion of the brazed body 44 can be performed by the circulation of the pure water (leak test step S13).

  Next, the inside of the brazing body 44 is cleaned by continuing the flow of the pure water in the water container 30 into the inside of the brazing body 44 for a predetermined time (pre-cleaning step S14).

  Next, by switching the supply switching valve 34 and the return switching valve 37, the acid aqueous solution in the acid aqueous solution container 31 is pressurized by the supply pump 35 and sent into the sealed space 22 through the supply pipe 33. The aqueous acid solution 22 is pressurized by the return pump 38 and returned to the aqueous acid solution container 31 through the return pipe 36 (surface treatment step S15).

  Next, by switching the supply switching valve 34 and the return switching valve 37, the plating solution in the plating solution container 32 is pressurized by the supply pump 35 and sent into the sealed space 22 through the supply piping 33. The plating solution 22 is pressurized by a return pump 38 and returned to the plating solution container 32 through a return pipe 36. A positive voltage is applied to the electrode 25 by the DC power supply 28 while circulating the plating solution. Thereby, the plating target portion is plated (plating step S16). At this time, the concentration measuring device 41 measures the concentration of the plating solution in the enclosed space 22 and monitors that the concentration of the plating solution is maintained within a predetermined range.

  Next, by switching the supply switching valve 34 and the return switching valve 37, the pure water in the water container 30 is pressurized by the supply pump 35 as in the pre-cleaning step S14 described above to pass through the supply piping 33 and the enclosed space. 22, and pure water in the sealed space 22 is pressurized by the return pump 38 and returned to the water container 30 through the return pipe 36 (post-cleaning step S17). Thereby, the plating solution remaining in the water supply and drainage box 13 is removed.

  Next, dry air is sent from the dryer 40 into the sealed space 22 to remove the water remaining in the water supply and drainage box 13 (drying step S18).

  Next, the water supply / drain box 13 and the mounting portion 21 are separated, and the plug 20 is removed from the wire opening 15 (removal step S19).

  Next, the plating thickness of the removed plug 20 is inspected (plating thickness measurement step S20). Thereby, it can be confirmed that the plating target portion of the brazing body 44 is formed with a plating of an appropriate thickness.

  According to the above-described procedure, it is possible to perform high-quality plating in which the thickness of the plating film is stable without much labor.

Second Embodiment
FIG. 5 is a schematic vertical sectional view showing the situation immediately after the closing step after the mounting step of the stator coil assembling method according to the second embodiment of the present invention. FIG. 6 is a schematic vertical sectional view showing the situation immediately after the closing step of the stator coil assembling method according to the second embodiment. FIG. 7 is a longitudinal cross-sectional view showing a tip end portion of the electrode of FIG. 5 and the vicinity of a stopper in an enlarged manner.

  In the second embodiment, a plug 52 made of an electrically insulating material is attached to the tip 27 of the electrode 25, and the straight pipe of the electrode 25 is further pressed to press the plug 52 toward the wire opening 15. A pressing portion 53 for pressing the portion 26 from the outside of the mounting portion 21 is provided. As shown in FIG. 7, the stopper 52 is composed of a cylindrical portion 54 made of an insulating material such as acrylic, for example, and a packing 55 made of a chemical resistant rubber coated near the tip of the cylindrical portion 54.

  After the mounting portion 21 is attached to the brazing body 44, as shown in FIG. 6, the pressing portion 53 presses the electrode 25 in the axial direction toward the brazing body 44 so that the plug 52 in the wire opening 15 is Can be pushed. At that time, the packing 55 is elastically deformed to thereby seal the space between the plug 52 and the plug 52 in a fluid-tight manner.

  Note that, as shown in FIG. 5, for example, a hinge between the tip of the straight pipe portion 26 and the tip 27 can be inserted so that the tip 27 of the electrode 25 can be inserted into the inside of the brazing body 44. (Not shown) is attached, and the tip 27 is structured to be folded.

  In the second embodiment, the order of the closing step S11 and the mounting step S12 in the first embodiment (FIG. 4) is reversed, and the mounting step S12 comes first. Thereafter, the closing step S11 is performed, and thereafter, similarly to the case of the first embodiment, the leak test step S13 to the drying step S18 are performed. In the removal step 19 after the drying step S18, the plug 52 is removed from the wire opening 15 by first operating the pressing portion 53 in the reverse of the step in the closing step S11. Thereafter, the water supply and drainage box 13 and the mounting portion 21 are separated.

  According to the second embodiment, the closing step S11 of inserting the plug 52 into the wire opening 15 and the operation of removing the plug 52 from the wire opening 15 can be performed quickly and easily.

Third Embodiment
FIG. 8 is an entire configuration view showing a state in which an electroplating apparatus is attached to a water supply and drainage box in the course of performing a stator coil assembly method according to a third embodiment of the present invention.

  This third embodiment is a modification of the first embodiment, in which the electrode (electrode rotating portion) 90 is rotatable about its axis, and a motor 58 for rotating the electrode 90 is provided. There is. Further, at the tip end portion 59 of the electrode 90, a jet port 60 is formed at a position separated in the radial direction from the axial center as a part of the in-electrode flow passage 50 communicating with the straight pipe portion 26 of the electrode 90. Furthermore, at the tip end portion 59, a stirring blade 61 is formed.

  In the plating step S16, the electrode 90 is rotated by the motor 58. At this time, the plating solution is spouted from the spout 60 of the tip end portion 59 of the electrode 90 in the enclosed space 22. Since the position of the jet nozzle 60 changes as the electrode 90 rotates, the plating solution in the sealed space 22 is agitated, and the plating thickness of the portion to be plated can be made uniform. Furthermore, the plating solution in the enclosed space 22 is agitated by the rotation of the agitating blade 61 formed in the tip portion 59, which also achieves the effect of making the plating thickness of the portion to be plated uniform.

  In the above description, the entire electrode 90 is rotated, but for example, only the tip end portion 59 may be used as the electrode rotating portion.

Fourth Embodiment
FIG. 9 is a schematic vertical sectional view showing a state in which the mounting portion is attached to the water supply and drainage box in the process of performing the stator coil assembling method according to the fourth embodiment of the present invention. FIG. 10 is a view showing a tip portion of an electrode in the stator coil assembling method according to the fourth embodiment, and is a view as viewed in the direction of arrows in FIG.

  The fourth embodiment is a modification of the first embodiment, and the tip portion (electrode rotating portion) 65 of the electrode 25 is rotatable around an axis. However, in the fourth embodiment, the motor 58 (FIG. 8) is not provided. The in-electrode flow passage 50 of the electrode 25 communicates with the spout 66 of the tip portion 65. The direction of the spout 66 is arranged to be inclined in the circumferential direction. When the liquid supplied through the in-electrode flow path 50 spouts from the spout 66 into the enclosed space 22, the flow of the liquid has a circumferential component, so the tip 65 rotates as a reaction of the flow. . As a result, the position of the spout 66 changes, so the liquid in the enclosed space 22 is agitated. Thus, the plating thickness of the portion to be plated can be made uniform.

Fifth Embodiment
FIG. 11 is a schematic vertical sectional view showing a state immediately after the mounting portion is attached to the water supply / drain box in the process of performing the stator coil assembling method according to the fifth embodiment of the present invention. FIG. 12 is a schematic vertical sectional view showing a state in which the tip end portion of the electrode is expanded after the mounting portion is attached to the water supply and drainage box in the process of assembling the stator coil according to the fifth embodiment.

  The fifth embodiment is a modification of the first embodiment, and a tip portion (tip member) 70 is attached to the tip of a straight pipe portion (shaft member) 26 (FIG. 2) of the electrode 25. A link mechanism 71 extending in the axial direction along the straight pipe portion 26 is provided. However, in FIG. 11 and FIG. 12, illustration of the straight pipe portion 26 and the conductive portion 92 is omitted. The distal end portion 70 is elongated in the axial direction as shown in FIG. 11 and reduced in the direction perpendicular to the axial direction, and is deployed in the direction perpendicular to the axial direction as shown in FIG. You can take The straight pipe portion 26 and the link mechanism 71 both extend through the mounting portion 21. The link mechanism 71 is connected to the operation unit 72 outside the mounting unit 21.

  By operating the link mechanism 71 with the operation unit 72, the small diameter state and the expanded state can be arbitrarily realized. Although the description of the specific configuration of the link mechanism 71 is omitted, in this embodiment, the tip end portion 70 branches into a plurality of branch portions 75, and in the small diameter state, these branch portions 75 Extend parallel to one another. Further, in the unfolded state, the branch portions 75 rotate and spread in directions away from each other.

  In the unfolded state, the tip end portion 70 spreads widely toward the plating target portion in the water supply and drainage box 13, and plating can be performed with a uniform thickness. However, in the unfolded state, the tip 70 can not pass through the box opening 16. On the other hand, in the small diameter state, the tip 70 can pass through the box opening 16.

  Although two branch portions 75 are illustrated in FIGS. 11 and 12, three or more branch portions 75 may be provided. Furthermore, in the unfolded state (FIG. 12), in the case where three or more branch portions 75 extend radially, a wire-like or flexible thread-like conductor connecting these branch portions 75 in the circumferential direction or mesh shape is used. You may provide. As a result, the tip portion 70 can be configured to spread more uniformly toward the portion to be plated in the water supply and drainage box 13.

  According to the fifth embodiment, in the plating step or the like, the tip portion 70 of the electrode is arranged to be spread toward the portion to be plated in the brazing body 44 in an expanded state to efficiently perform good plating. Can. Moreover, the tip end portion 70 of the electrode 25 can be easily passed through the box opening 16 and disposed at a desired position in the water supply and drainage box 13.

Sixth Embodiment
FIG. 13 is a schematic vertical sectional view showing a state immediately after the mounting portion is attached to the water supply / drain box in the process of performing the stator coil assembling method according to the sixth embodiment of the present invention. FIG. 14 is a schematic vertical cross-sectional view showing a state in which the tip of the electrode is expanded after the mounting portion is attached to the water supply and drainage box in the process of assembling the stator coil according to the sixth embodiment.

  The sixth embodiment is a modification of the fifth embodiment, and a tip (tip member) 80 is attached to the tip of a straight pipe (shaft member) 26 (FIG. 2) of the electrode 25. A link mechanism 81 extending in the axial direction along the straight pipe portion 26 is provided. However, illustration of the straight pipe portion 26 is omitted in FIGS. 13 and 14. The distal end portion 80 is elongated in the axial direction as shown in FIG. 13 and reduced in the direction perpendicular to the axial direction, and is deployed in the direction perpendicular to the axial direction as shown in FIG. You can take The straight pipe portion 26 and the link mechanism 81 both extend through the mounting portion 21. The link mechanism 81 is connected to the operation unit 82 outside the mounting unit 21.

  By operating the link mechanism 81 with the operation unit 82, the narrow diameter state and the expanded state can be arbitrarily realized. In the sixth embodiment, the distal end portion 80 has a plurality of operating unit side branched portions 85 and a plurality of distal end side branched portions 86 connected to each operating unit side branched portion 85, and the distal end side branched portion The tip of 86 is connected by a tip connecting portion 87.

  According to the sixth embodiment, as in the case of the fifth embodiment, in the unfolded state, the leading end 80 is widely spread toward the portion to be plated in the water supply and drainage box 13 and has a uniform thickness. Plating can be performed. However, in the unfolded state, the tip 80 can not pass through the box opening 16. On the other hand, in the small diameter state, the tip 80 can pass through the box opening 16.

  13 and 14 show two sets of the operating unit side branch unit 85 and the front end side branch unit 86, three or more sets of the operation unit side branch unit 85 and the front end side branch unit 86. There may be a set of Furthermore, in the unfolded state (FIG. 14), when the combination of three or more sets of the operating unit side branch unit 85 and the front end side branch unit 86 radially extends, these operation unit side branch units 85 and the front end side branch A wire-like or flexible thread-like conductor may be provided to connect the portions 86 in the circumferential direction or in a mesh. Thereby, the tip portion 80 can be configured to spread more uniformly toward the portion to be plated in the water supply and drainage box 13.

  According to the sixth embodiment, similarly to the fifth embodiment, in the plating step etc., the tip end portion 80 of the electrode is disposed so as to spread toward the plating target portion in the brazing body 44 in the expanded state, Good quality plating can be performed efficiently. Moreover, the tip end portion 80 of the electrode 25 can be easily passed through the box opening 16 and disposed at a desired position in the water supply and drainage box 13.

[Other embodiments]
The features of each of the above embodiments can be combined as appropriate.

  In the above embodiment, the plugs 20 and 52 are pushed into the wire opening 15 to close the hollow coil wire 11. However, as another embodiment, a lid is provided on the outside of the wire opening 15. The wire opening 15 can also be closed by covering it.

  Further, although the DC power supply 28 is used in the above embodiment, as another example, it is also possible to improve the degree of adhesion by using a pulse power supply or an AC power supply in combination.

  While certain embodiments have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the invention. These embodiments can be implemented in other various forms, and various omissions, substitutions, changes, and combinations can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the invention described in the claims and the equivalents thereof as well as included in the scope and the gist of the invention.

DESCRIPTION OF SYMBOLS 10 ... Stator coil, 11 ... Coil wire, 13 ... Water supply and drainage box (box-like body) 14 ... Braze material, 15 ... Wire opening part, 16 ... Box opening part (box-like body opening part), 20 ... Plug, 21 Mounting portion 22 Sealed space 25 Electrode 26 Straight pipe portion (shaft member) 27 Tip portion 28 DC power source (power source) 30 Water container 31 Acid solution container 32 Plating solution container, 33: Supply piping, 34: Supply switching valve, 35: Supply pump, 36: Return piping, 37: Return switching valve, 38: Return pump, 40: Dryer, 41: Concentration measuring device, 44: Brazing Body: 50: electrode internal flow passage, 52: plug, 53: pressing portion, 54: cylindrical portion, 55: packing, 58: motor, 59: tip (electrode rotating portion), 60: spout, 61: stirring blade , 65 ... tip ( Rotating part), 66: Spout, 70: Tip part (tip member), 71: Link mechanism, 72: Operation part, 75: Branching part, 80: Tip part (tip member), 81: Link mechanism, 82: Operation Part 85: Operation part side branch part 86: Tip side branch part 87: Tip connection part 90: Electrode (electrode rotating part) 92: Conductive part

Claims (19)

An electroplating apparatus for electroplating at least a part of a plating target portion inside a box-like body having a box-like body opening, comprising:
A mounting portion which is detachable from the box-like body opening and which forms a sealed space together with the box-like body when mounted;
A plating solution container for storing the plating solution;
An aqueous acid solution container for storing an aqueous acid solution for cleaning the surface of the plating target portion;
A water container for storing water,
A supply pipe connected to the mounting unit to supply the plating solution in the plating solution container, the aqueous acid solution in the aqueous acid solution container, and the water in the water container to the sealed space;
Only one of the plating solution in the plating solution container, the aqueous acid solution in the aqueous acid solution container, and the water in the water container is selectively supplied to the sealed space by being connected to the supply pipe. To switch the supply switching valve, and
A supply pump connected to the supply pipe for pressurizing the plating solution in the plating solution container, the aqueous acid solution in the aqueous acid solution container, and the water in the water container, and sending it to the sealed space;
A return pipe connected to the mounting portion for returning the plating solution, the acid aqueous solution and the water in the sealed space to the plating solution container, the acid aqueous solution container and the water container, respectively;
A return switching valve connected to the return pipe to switch the plating solution, the aqueous acid solution and the water in the enclosed space back to the plating solution container, the aqueous acid solution container and the water container, respectively;
An electrode attached to the mounting portion, extending toward the plating target portion in the enclosed space, and connectable to a power supply outside the enclosed space;
An electroplating apparatus comprising:   The electrode is formed with an in-electrode flow passage extending toward the plating target in the enclosed space and having both ends opened, and the in-electrode flow passage is connected to the supply pipe, and the supply pipe The electroplating apparatus according to claim 1, characterized in that the liquid supplied from the nozzle is configured to be jetted toward the portion to be plated through the inside of the flow path in the electrode. The electrode includes an electrode rotating unit disposed in the enclosed space,
An outlet portion of the flow passage in the electrode is formed in the electrode rotating portion, and the electrode rotating portion is configured to rotate by reaction of the ejection of the liquid when the liquid is ejected from the outlet portion. The electroplating apparatus according to claim 2, characterized in that It further has a motor,
The electroplating apparatus according to claim 1, wherein the electrode includes an electrode rotating unit which is disposed in the enclosed space and rotated by the motor.   The electroplating apparatus according to claim 4, wherein a stirring blade is formed on the electrode rotating portion.   The electroplating apparatus according to any one of claims 1 to 5, wherein the electrode is an insoluble electrode.   The electroplating apparatus according to any one of claims 1 to 6, further comprising a concentration measuring device attached to the mounting portion to measure the concentration of the plating solution in the enclosed space. . A wire opening is disposed inside the box-like body,
The electroplating apparatus according to any one of claims 1 to 7, further comprising: a pressing portion configured to press a plug against the wire opening in order to close the wire opening. Electroplating equipment. The electrode is
An axially extending electrically conductive shaft member;
A conductive tip member attached to the tip of the shaft member and electrically connected to the shaft member;
An operation unit disposed outside the sealed space and attached to the shaft member;
The distal end member is operated according to the operation of the operation unit, and the distal end member has two states: a narrow diameter state in which the axial direction is elongated and a deployed state in which the distal end member is expanded in the direction perpendicular to the axial direction. A link mechanism configured to achieve
The electroplating apparatus according to any one of claims 1 to 8, comprising: A method of assembling a stator coil of a water-cooled electric rotating machine, comprising:
A plurality of coil strands including at least one hollow coil strand are aligned in parallel with one another, and the ends of the coil strands are connected to each other, and the coil strand and the water supply and drainage box are brazed to form a brazing body A brazing step,
Closing the wire opening by pressing a plug against the wire opening of the hollow coil wire in the water supply and drainage box;
A mounting step of mounting a mounting portion to which an electrode is mounted on the water supply / drain box, and forming a sealed space by the water supply / drain box, the plurality of coil wires, the plug and the mounting portion;
A pre-cleaning step of supplying water into the sealed space to clean the sealed space after the mounting step;
A surface treatment step of supplying an aqueous acid solution into the enclosed space to perform surface treatment of the inside of the brazing body after the pre-cleaning step;
After the surface treatment step, a plating step of supplying a plating solution into the enclosed space and electrifying the electrode to electroplate the inside of the brazed body;
Removing the mounting portion and the plug after the plating step;
A method of assembling a stator coil.   11. The method according to claim 10, further comprising a leak test step of supplying water into the enclosed space to test for the presence or absence of water leak after the mounting step and before the pre-cleaning step. Stator coil assembly method.   12. The method according to claim 10, further comprising a post-cleaning step of supplying water into the enclosed space and cleaning the enclosed space after the plating step and before the removal step. The stator coil assembly method described.   13. The method according to claim 10, further comprising a drying step of supplying dry air into the enclosed space to dry the enclosed space after the plating step and before the removal step. The stator coil assembly method according to any one of the preceding claims.   The stator coil assembly method according to any one of claims 10 to 13, wherein in the brazing step, the entire surface of the end face of the coil wire is covered with brazing.   The stator coil assembly according to any one of claims 10 to 14, wherein in the closing step, a plug is pushed into the wire opening and the periphery of the plug is covered with a hot melt adhesive. Method.   The stator coil according to any one of claims 10 to 15, further comprising a plating thickness measuring step of measuring a thickness of plating attached to the surface of the plug after the removing step. How to assemble. The plug includes an elastic portion,
The closing step includes the step of pushing the plug into the wire opening while elastically deforming the plug;
The stator coil assembling method according to any one of claims 10 to 16, characterized by: The electrode can be in a narrow diameter state which is elongated in the axial direction and a spread state which is expanded in the direction perpendicular to the axial direction.
Performing the mounting step and the removing step in the narrow diameter state;
Performing the plating step in the expanded state;
The stator coil assembling method according to any one of claims 10 to 17, characterized by: An axially extending electrically conductive shaft member;
A conductive tip member attached to the tip of the shaft member and electrically connected to the shaft member;
An operation unit attached to the shaft member at a position away from the tip end of the shaft member;
The distal end member is operated according to the operation of the operation unit, and the distal end member has two states: a narrow diameter state in which the axial direction is elongated and a deployed state in which the distal end member is expanded in the direction perpendicular to the axial direction. A link mechanism configured to achieve
An electrode for electroplating comprising:

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