JP2005350698A - Electroplating method for box-shaped work, electroplating device, and holder for electroplating - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electroplating method for a box-shaped work with which, in the case the inside face of a box-shaped work such as a box nut is subjected to surface treatment, a satisfactory plating film is formed, to provide an electroplating device, and to provide a holder for electroplating. <P>SOLUTION: The holder for electroplating is provided with: a base part having a through hole piercing from the upper face to the lower face; a first supporting member extended from the upper face on the through hole in the base part; a second member guiding part extended from the base part; a second supporting member which has insertion holes into which the first supporting member and the second member guiding part are inserted and can slide along the second member guiding part; and a supporting part supporting the second member guiding part. The first supporting member can support a box-shaped work in a state of thrusting up the inside face thereof, and external plating is performed in this state. Further, the second supporting member can support the box-shaped work in a seated state, and internal plating is performed in this state. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bag-shaped workpiece electroplating method, an electrolytic plating apparatus, and a holder for electrolytic plating for plating a bag-shaped workpiece having a bag-shaped space.

  The surface of a bag-like workpiece, for example, a cap nut, is subjected to a treatment such as electrolytic plating. When the outer surface and the inner surface of the bag-shaped workpiece are subjected to treatment such as acid electrolysis (scaling after quenching) or electrolytic plating, a so-called immersion holder in which a fish bone is suspended upside down is often used. By attaching one cap nut to each branch part of the immersion holder from its opening, a large number of cap nuts are in a tree shape with each facing upward (the opening is inclined downward). The holding tool is dipped in an acid electrolysis tank (mainly sulfuric acid solution or the like), a plating tank or the like together with a number of cap nuts to perform descaling or plating (Patent Document 1).

  FIG. 21 conceptually shows a conventional immersion holder for holding a cap nut and immersing it in a plating tank or the like. (A) is a front view of the immersion holder 201. FIG. The dipping holder 201 has a support collar 202 formed in a shape that faces obliquely upward from the main body frame. The dipping holder 201 holds the cap nut 1 in such a manner that the opening of the cap nut 1 is inserted into the support collar 202. FIG. 21 (b) shows the immersion holder 201 immersed in the plating tank 215. The figure shows the side of the immersion holder 201. In this manner, the bag-shaped nut 1 is held by the immersion holder 201 and immersed in the plating tank 215 or the like to perform the surface treatment of the outer surface and the inner surface. At this time, the electrode 211 is installed in the plating tank 215, a positive voltage is applied, and a negative charge is applied to the immersion holder 201 to perform the surface treatment of the cap nut 1.

JP 2001-335994 A

  However, in the process of immersing the immersion holder 201 together with a number of cap nuts 1, for example, in a bath such as a plating bath 215, a solution such as a plating solution enters the closed space (closed space) of the cap nut 1. However, the liquid cannot be filled in the closed space by the air confined in the closed space, and a portion that cannot contact the liquid remains on the inner surface of the cap nut. In addition, there is a situation where most of the current flows to the outer surface of the cap nut 1 and hardly flows to the inner surface. That is, according to such a method, it is difficult to treat the entire inner surface of the cap nut with a plating solution or the like.

  Further, when the support collar 202 is formed in multiple stages as in the immersion holder 201 of FIG. 21, the thickness of the plating layer formed on the cap nut held on the upper stage and the cap nut held on the lower stage is different. End up. This is because the current flow is not uniform because of multiple stages, and a thick plating layer is formed on the lower cap nut. That is, the plating thickness varies between products.

  Then, the subject of this invention is the electroplating method of a bag-shaped workpiece | work which forms a favorable plating film, and an electroplating apparatus, when surface-treating the inner surface of bag-shaped workpieces, such as a cap nut, by immersing in a liquid tank And providing a holder for electrolytic plating.

Means for Solving the Problems and Effects of the Invention

The electrolytic plating method of the bag-shaped workpiece of the present invention for solving the above problems is as follows.
First support for supporting the bag-shaped workpiece in a state of being pushed up by contacting the inner surface of the bag-shaped workpiece in order to hold the bag-shaped workpiece having the bag-shaped space in the plating solution so that the opening faces downward. Using a member and a second support member that supports the bag-shaped workpiece by sitting instead of the first support member,
While the bag-like workpiece is seated on the second support member, a voltage acting as a cathode is applied to the second support member in contact with the bag-like workpiece in a state where the tip of the first support member is separated from the inner surface of the bag-like workpiece. And applying at least the inner surface of the bag-shaped space to the first support member that is positioned in the bag-shaped space of the bag-shaped workpiece or in the vicinity of the opening of the bag-shaped space. A first step of performing electroplating on
Before or after the first step, the bag-like work is pushed up with the first support member abutting on the inner surface thereof, and the bag-like work is brought into contact with the bag-like work in a state of being separated from the second support member. A second step of applying electrolytic plating to at least the outer surface of the bag-like workpiece in a state where a voltage serving as a cathode is applied to the first support member;
including.

  In the first step, the bag-like work is seated on the second support member, and the tip of the first support member is immersed in the plating solution in a state of being separated from the inner surface of the bag-like work. In this state, when a negative voltage is applied to the second support member and a positive voltage is applied to the first support member, the bag-like workpiece becomes a cathode and is located apart in the bag-like space or opened in the bag-like space. Since the first support member located in the vicinity of the portion serves as a positive electrode, current can efficiently flow on the inner surface of the bag-shaped workpiece, and the inner surface forming the bag-shaped space can be satisfactorily plated with the plating solution in the bag-shaped space. it can.

  In the second step, the inner surface of the bag-shaped workpiece is supported while being pushed up by the first support member, and the second support member is immersed in the plating solution in a state of being separated from the bag-shaped workpiece. In this state, the outer surface of the bag-like workpiece can be plated by applying a negative voltage to the first support member. In addition, it is good to arrange | position an electrode in the state spaced apart from the bag-shaped workpiece | work, and to apply a positive voltage to this electrode, and to perform an outer surface plating process. Further, the second step may be performed before the first step.

The electrolytic plating apparatus for bag-like workpieces of the present invention for solving the above problems is as follows.
A first support member that supports the bag-shaped workpiece in a state of pushing up by contacting the inner surface of the bag-shaped workpiece so that the opening of the bag-shaped workpiece having the bag-shaped space faces downward in the plating solution;
A second support member that seats and supports the bag-like workpiece instead of the first support member;
The bag-like workpiece is seated on the second support member, the first position where the tip of the first support member is separated from the inner surface of the bag-like workpiece, and the bag-like workpiece is pushed up by bringing the first support member into contact with the inner surface. A support member relative position conversion device that converts a relative position between the first support member and the second support member between a second position that supports the bag-like workpiece apart from the second support member, and
A voltage serving as a cathode is applied to the second support member in contact with the bag-like workpiece at the first position, and the first support is located in the bag-like space of the bag-like workpiece or in the vicinity of the opening of the bag-like space. The polarity of the voltage application to at least the first support member is changed so that the voltage to be the anode is applied to the member while the voltage to be the cathode is applied to the first support member that is in contact with the bag-like workpiece at the second position. A voltage polarity conversion device that includes:
In the first position where the bag-like workpiece is seated on the second support member and the first support member is separated from the inner surface of the bag-like workpiece, a voltage serving as a cathode is applied to the second support member by the voltage polarity conversion device. Electrolytic plating is performed on at least the inner surface of the bag-shaped space with a voltage serving as an anode applied to the first support member located in the bag-shaped space of the bag-shaped workpiece or in the vicinity of the opening of the bag-shaped space. The first support member abuts the bag-like workpiece against the inner surface and pushes it up, and the first support member abuts against the bag-like workpiece by the voltage polarity converter at the second position where the bag-like workpiece is separated from the second support member. Electrolytic plating is performed on at least the outer surface of the bag-shaped workpiece in a state where a voltage serving as a cathode is applied to the member.

  The first support member can be supported in a state where the inner surface of the bag-like workpiece is pushed up. In addition, the second support member can support the bag-like workpiece by being seated thereon. In the first position, the bag-shaped workpiece is seated on the second support member, and the tip of the first support member is separated from the inner surface of the bag-shaped workpiece. In the second position, the bag-like workpiece is pushed up with the first support member in contact with the inner surface thereof, and the bag-like workpiece is supported while being separated from the second support member.

  Then, by dipping the bag-like workpiece in the plating solution, applying a negative voltage to the second support member and applying a positive voltage to the first support member at the first position, the inner surface forming the bag-like space is formed. It can be plated. Furthermore, the outer surface of the bag-like workpiece can be plated by applying a negative voltage to the first support member at the second position. According to the electrolytic plating apparatus, the inner surface and the outer surface of the bag-like workpiece can be finished into different plating layers.

The holder for electrolytic plating of the bag-like workpiece of the present invention for solving the above problems is
A first support member that supports the bag-shaped workpiece in a state of pushing up by contacting the inner surface of the bag-shaped workpiece so that the opening of the bag-shaped workpiece having the bag-shaped space faces downward in the plating solution;
A second support member that seats and supports the bag-like workpiece instead of the first support member;
The bag-like workpiece is seated on the second support member, the first position where the tip of the first support member is separated from the inner surface of the bag-like workpiece, and the bag-like workpiece is brought into contact with the inner surface and pushed up. A support member moving mechanism that supports the first support member and the second support member so as to be relatively movable between a second position for supporting the bag-like workpiece apart from the second support member;
including.

  The first support member can be supported in a state where the inner surface of the bag-like workpiece is pushed up. In addition, the second support member can support the bag-like workpiece by being seated thereon. The first support member and the second support member can be relatively moved by the support member moving mechanism. As the first position, the bag-like workpiece can be seated on the second support member, and the tip of the first support member can be separated from the inner surface of the bag-like workpiece. Further, as the second position, the bag-like workpiece can be pushed up by bringing the first support member into contact with the inner surface of the bag-like workpiece and the bag-like workpiece is supported while being separated from the second support member.

The holder for electrolytic plating of the bag-like workpiece of the present invention is
A body frame connected to the lifting mechanism of the plating line;
A bag-shaped workpiece having a bag-shaped space is supported in a state in which the bag-shaped workpiece is pushed up in contact with the inner surface of the bag-shaped workpiece so that the opening faces downward in the plating solution and fixed to the main body frame. A plurality of first support members that are adjacent to each other at the same height and support one bag-like workpiece,
The first support members are arranged substantially parallel to the straight line connecting the tips of the first support members, and the plurality of first support members are inserted through the first support members, and the plurality of bag-like workpieces are seated with the openings facing downward to provide the first support. A second support member provided with a plurality of insertion and support holes for supporting the bag-shaped workpiece instead of the member, the height of which can be changed with respect to the first support member;
The bag-shaped workpiece is seated on the second support member, the first position where the tip of the first support member is separated from the inner surface of the bag-shaped workpiece, and the first support member abuts the inner surface of the bag-shaped workpiece to form a bag 2nd member 2nd member guide which pushes up a workpiece | work and guides a 2nd support member with respect to a 1st support member so that raising / lowering is possible between the 2nd positions which isolate | separate and support a bag-shaped workpiece | work from a 2nd support member. And
including.

  The electrolytic plating holder can be connected to the lifting mechanism of the plating line by the main body frame. The first support member can be supported in a state where the inner surface of the bag-like workpiece is pushed up. In addition, the second support member can support the bag-like workpiece by being seated thereon. The second support member can be moved up and down with respect to the first support member by the second member guide.

Furthermore, the holder for electrolytic plating of the bag-like workpiece of the present invention is:
A base portion having a through hole penetrating the upper surface and the lower surface;
A first support member extending from an upper surface on the through hole of the base portion;
A second member guide portion extending from the base portion;
A second support member having an insertion hole into which the first support member and the second member guide portion are inserted, and capable of sliding along the second member guide portion;
A support part for supporting the second member guide part;
With
The bag-like workpiece is supported by the first support member or the second support member, immersed in a liquid tank having a plating solution, and the bag-like workpiece is treated with the plating solution.

  The bag-like workpiece can be held by the first support member or the second support member. The second support member is slidable by the second member guide portion. By sliding the second support member, the bag-like workpiece is held by the first support member, or the bag-like workpiece is held on the second support member. Can be seated.

More specifically,
The head surface of the bag-like space of the bag-like workpiece and the tip of the first support member are separated from the base and held at a raised position closer to the base than the tip of the first support member. By applying a negative voltage to the bag-like workpiece by applying a negative voltage to the second support member, and applying a positive voltage to the first support member, the plating solution The inner surface of the bag-like workpiece can be processed with.

  When the bag-like workpiece is immersed in the plating solution in the downward state, the bag-like space of the bag-like workpiece contains a gas such as air, and the plating solution does not enter the bag-like space of the bag-like workpiece. Therefore, by sucking a gas or a plating solution that fills the bag-like space of the bag-like workpiece through the through hole of the base portion and the first support member, or by ejecting the plating solution from the first support member, the bag The inner surface of the workpiece is treated with the plating solution. In this way, the entire interior of the bag-like space can be plated by sucking gas or the like or ejecting the plating solution. In addition, if the front-end | tip part of a 1st support member is the state insulated with the bag-shaped workpiece | work, and a fluid can flow, the front-end | tip part may contact the inner surface of a bag-shaped workpiece.

  Also, by lowering the second support member to the lowered position, the tip surface of the first support member is brought into contact with the head surface of the bag-like space of the bag-like workpiece, and a negative voltage is applied to the first support member. Thus, a negative voltage can be applied to the bag-shaped workpiece and the outer surface treatment of the bag-shaped workpiece can be performed with the plating solution.

  Furthermore, in addition to applying a negative voltage to the bag-shaped workpiece, the bag surface workpiece is treated with a positive electrode in the liquid tank and immersed in the liquid tank to apply a negative voltage to the bag-shaped workpiece. By doing. By using such a bag-shaped workpiece electrolytic plating holder, inner plating and outer plating can be performed in different processes, so that the inner plating layer and outer plating layer have different finishes. Can do.

  Furthermore, the voltage can be applied to the bag-shaped workpiece by applying a voltage to the first support member and the second support member by forming at least the first support member and the second support member with a conductor. Thus, an electrolytic plating process can be performed.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a cap nut as an example of a bag-like workpiece. The cap nut 1 includes a main body 2 having a female screw portion 4 and a cap portion 3 that closes the opening of the main body 2 on the side opposite to the screwing side of the screw member. A bag-like space (closed space) 5 is formed by a place (a portion into which a tip portion of a male screw member such as a bolt enters). The outer surface of the main body 2 has a flange 7 protruding to the side. An example of such a cap nut is a hub nut. Such a cap nut 1 is immersed in a predetermined bath for cleaning, rust prevention, plating, etc. after forging, further threading by rolling or cutting, welding of the cap 3 and heat treatment as necessary. Is done.

  At that time, an immersion holder 21 which is a holder for electrolytic plating as shown in FIG. 2 is used. The immersion holder 21 serves as a first support member serving as a base portion 27 having a through hole penetrating the upper surface and the lower surface, and a suction pipe (or discharge pipe) extending from the through hole on the upper surface side of the base portion 27. A projecting tube 25 formed in a shaft shape, a guide shaft 24 as a second member guide portion extending from the base portion 27, and a first insertion hole (through hole) into which the plurality of projecting tubes 25 and the guide shaft 24 are inserted. (2) A sliding plate 26 as a support member, support shafts 23a and 23b for supporting the guide shaft 24, and a support plate 22 constituting a part of a main body frame connected to the support shafts 23a and 23b. The immersion holder 21 is formed of a conductor such as metal so that a current can flow. For example, titanium can be used. However, the support plate 22 is formed of a non-conductor to insulate the support shaft 23a and the support shaft 24b (if the support shaft 23a and the support shaft 24b are insulated, the entire support plate 22 is a non-conductor. Need not be). The support plate 22 is not limited to the shape shown in the figure as long as it can be connected to the transport line. Although the base portions 27 are formed in two rows in parallel, they are not necessarily formed in two rows or in parallel. Further, although three protruding tubes are formed on each base portion 27, the number of protruding tubes is not limited to three. Increasing the number of bases and the number of protruding tubes makes it possible to process many bag-like workpieces simultaneously.

  In the case of a conventional immersion holder having a multi-stage bag-like workpiece holder, a liquid tank for pretreatment and plating needs to be formed deeply, whereas the immersion holder 21 has a protruding tube 25 on one side. Since they are arranged on the top, the depth of the liquid tank for pretreatment and plating can be reduced. Since the washing tank can also be made shallower, the amount of water supplied and discharged is reduced. Moreover, the building which installs a plating processing line can be made lower than before. Furthermore, in the case of the conventional multistage immersion holder, there is a difference in the plating thickness between the bag-like workpiece held in the upper stage and the bag-like workpiece held in the lower stage, but this immersion holder 21 is formed in one stage. Therefore, a difference in the plating thickness of the bag-like workpiece is unlikely to occur. In the conventional multistage immersion holder, when the plating treatment is performed in order to make the plating thickness 25 μm, the plating thickness variation of about 10 μm occurs between products. Since the object to be plated has a one-stage structure in which the object to be plated is arranged on one surface, the immersion thickness of the immersion holder can be suppressed to about 2 to 3 μm.

  FIG. 3 shows an enlarged cross-sectional view of the immersion holder 21. A plurality of through holes 28 are formed in the base portion 27 (in the case of the embodiment of FIG. 2, one base portion 27 has three through holes), and the protruding tube 25 is formed on the through hole 28. ing. An insulating portion 12 (for example, a resin mold) is formed on the surface of the protruding tube 25 except for the distal end portion 35. The through hole 34 of the projection tube 25 and the through hole 28 of the base portion 27 are formed in a row, and from the lower portion of the base portion through hole 28 to the upper portion of the projection tube through hole 34 or from the upper portion of the projection tube through hole 34. A gas or a liquid can flow to the lower part of the base through hole 28. The cap nuts 1 are attached to the tip portions 35 of the protruding tubes 34 one by one. The sliding plate 26 is formed with a guide shaft 24a and a through-hole 33 for inserting the protruding tube 25. The sliding plate 26 is guided by the guide shaft 24a and can slide along the guide shaft 24a. It is. The sliding member 26 and the guide shaft 24 constitute a support member moving mechanism. Further, the immersion holder 21 may be provided with a driving device such as a motor and moved up and down. In this case, the driving device is also included in the support member moving mechanism. The protruding tube 25 is located in the through hole 33 of the sliding plate 26. The guide shaft 24a and the base portion 27 are electrically insulated by the insulating portion 11 (for example, vinyl chloride).

  FIG. 4 shows an enlarged perspective view of the immersion holder 21. An example in which the cap nut 1 is attached to the middle protruding tube 25 is shown. The cap nut 1 is mounted so as to cover the tip portion 35 of the protruding tube 25. In the figure, the cap nuts 1 are not attached to the other protruding tubes 25, but in the surface treatment step, the cap nuts are usually attached to the tip portions of all the protruding tubes 25. The figure also shows that the sliding plate 26 is set at the raised position moved upward. When the sliding plate 26 is in the raised position, inner plating can be performed as described later. In this embodiment, there are three protruding tubes, but the number of protruding tubes is not limited to three. Furthermore, it is not always necessary that the guide shaft and the plurality of projecting tubes are aligned.

  FIG. 5 shows an example of an electrolytic plating line. Liquid tanks 51 to 67 for performing each processing step are installed side by side, and a transport line 72 for transporting the immersion holder 21 is installed thereabove. Further, a control panel 71 for controlling various conditions of the transfer line 72 and each liquid tank is installed. The conveyance line 72 includes an elevating device 73 for moving the immersion holder 21 up and down, and a connecting part 74 for connecting the immersion holder 21 (the immersion holder 21 and the connecting part 74 other than on the semi-gloss tank 59, The lifting device 73 is omitted and not shown). By sequentially performing the treatment in each liquid tank, electrolytic plating (for example, nickel chrome plating or the like) is performed on the cap nut 1 as a bag-like workpiece.

  First, in a load / unload process (station) (not shown), the cap nut 1 is attached to the protruding tube 25 of the immersion holder 21 so that the opening faces downward. Then, the immersion holder 21 having the cap nut 1 mounted on the protruding tube 25 is connected to the conveyance line 72 and is immersed in the respective liquid tanks while being conveyed along the cyclic conveyance path.

  The circular transport path 72 is such that an endless track such as a chain is circulated by a driving device such as a motor. The connecting portion 74 and the lifting device 73 of the circular conveyance path 72 circulate along the cyclic conveyance path 72.

  A certain immersion holder 21 is intermittently sent along the circulating conveyance path 72, stops on each liquid tank, descends, and is immersed in the liquid tank. And it is pulled up from a liquid tank and sent to the next liquid tank. Electrolytic plating is performed on the cap nut attached to the immersion holder 21 by making a round of each liquid tank by advance, stop, descend, rise and advance. After these steps are completed, the load / unload station is returned to, and the dipping holder 21 together with the cap nut 1 is removed from the connecting portion 74. Instead, another dipping holder 21 that holds a large number of untreated cap nuts 1 is used. Is attached to the connecting portion 74.

  Next, each step will be described. Prior to the electrolytic plating process, a pre-process such as degreasing is performed. The main ones are a degreasing process in the degreasing tank 51, an electrolysis (scale removal) process in the cathodic acid electrolytic tank 52, a pickling process in the pickling tank 54, an electrolytic degreasing (activation) process in the anodic electrolytic degreasing tank 56, and neutralization. This is a neutralization step in the tank 57. Between these, washing tanks 53, 55, and 58 are disposed and cleaned. When the pre-process is completed, a plating process is subsequently performed. The plating process is performed by a semi-gloss tank 59, a Tri Ni tank 60, a gloss Ni 61, a Joule Ni tank 62, and a chromium tank 64. Moreover, it wash | cleans with the water-washing tanks 63,65,66, and is dried with the drying tank 67, and the processed nut is removed by the load / unload station (not shown), An unprocessed container nut Is installed. That is, the immersion holder 21 is intermittently moved and repeatedly immersed in each of the liquid tanks 51 to 66 and various processes are performed. When the intermittent movement is stopped, the respective immersion holders 21 are lowered at the same time, so that steps such as degreasing, washing, and plating are performed in parallel.

  Here, paying attention to one immersion holder 21, the respective steps for the plurality of cap nuts held thereon will be described in order. At the load / unload station, a large number of cap nuts supplied to the process line (circular conveyance path) via the immersion holder 21 are moved forward from the station by a certain amount and stopped. Alkaline degreasing is performed by dipping (lowering) in (degreasing layer 51). Next, after being pulled up (raised) and moved forward by a certain amount, the cathodic acid electrolysis step is performed in the electrolytic cell 52 to remove the scale generated in the cap nut by heat treatment (expand the scale). Subsequently, the water is pulled up (raised), moved forward by a certain amount, and then immersed (lowered) in the water rinsing tank 53, and the water washing step 53 is performed. After the rinsing, the cap nut is lifted (together with the immersion holder 21) and moved forward by a certain amount, and this time the cap nut is immersed (lowered) in a sulfuric acid solution or the like (pickling bath 54).

  Then, the cap nut is immersed in a predetermined alkaline solution (anodic electrolytic degreasing bath 56) in order to improve the plating after the sulfuric acid solution and the like are washed in the washing bath 55 in the same washing step as described above. Then, an anodic electrolytic degreasing step for activating the surface is performed. Furthermore, it passes through the neutralization process (neutralization tank 57) and the water washing process (water washing tank 58) similar to the above to reach the plating process.

  In the plating step, nickel plating is performed in each of the semi-gloss tank 59, the tri-Ni tank 60, the gloss Ni tank 61, and the joule Ni tank 62. A large number of cap nuts are immersed (lowered) in the plating tank 57 while being held by the immersion holder 21, and a plating layer is formed on the cap nut. In the semi-gloss tank 59, as will be described later, inner plating and outer plating are performed. In each of the subsequent Ni tank 60, gloss Ni tank 61, and Joule Ni tank 62, outer plating is performed.

  By such a plating process, semi-gloss plating can be applied to the inner surface and bright plating can be applied to the outer surface. Since the outer surface can be glossy finished, a decorative effect can be secured. That is, the inner surface and the outer surface can be finished as different plating layers. In addition, since the entire inner surface can be plated, not only a rust prevention effect can be obtained on the inner surface, but the inner surface can be thinly finished with semi-gloss plating, so that it is easy to ensure the accuracy of the screw.

  When this plating step is completed, the plate is moved forward by a certain amount, and then immersed in the water rinsing tank 63 and washed with water. And it is further immersed in the chromium tank 64, and chromium plating is given. Subsequently, the baths 65 and 66 in the washing step are reached, where the plating solution is washed.

  The use of the immersion holder 21 is not necessarily limited to the plating process as described above. If necessary, a partial plating process can be omitted, or a further process can be performed.

  The process in the electrolytic plating line using the immersion holder 21 will be described with reference to FIG. The cap nut 1 held by the immersion holder 21 is sequentially immersed in the liquid tank in the pretreatment process, the surface is cleaned, and after being washed in the water washing tank 58, it is moved to the semi-gloss tank 59 in the plating process. In the semi-gloss tank 59, inner plating and outer plating are performed. As shown in (a), the immersion holder 21 moved onto the semi-gloss plating tank 59 is lowered and immersed in the semi-gloss plating tank 59 as shown in (b). The semi-gloss plating tank 59 is provided with a flow assisting tool 85 having a nozzle 86. A flow aid is shown in FIG. The flow assisting tool 85 has a plurality of nozzles 86 on the upper surface. The nozzle 86 is formed with a through hole (not shown), and the through hole is connected to a pipe 87 connected to the lower surface of the flow assisting tool 85. Then, as shown in FIG. 6, the pipe 87 is connected to the pump 75 from the lower surface of the flow assisting tool 85.

  As shown in FIG. 6B, the through hole 28 (see FIG. 3) of the base portion 27 of the immersion holder 21 contacts the nozzle 86 formed on the upper surface of the flow assisting tool 85. When inner plating is performed, the sliding plate 26 is set at the raised position.

  The position of the sliding plate 26 of the inner plating and outer plating immersion holder 21 in the semi-gloss tank 59 will be described with reference to FIG. Internal plating is applied on the left side of the figure, and external plating is applied on the right side. After the cap nut 1 is washed in the water washing tank 58 as shown in FIG. 5A, first, the sliding plate 26 is moved up to the front part (left side of the figure) of the semi-gloss tank 59 and the base part 27 is penetrated. In a state where the hole 28 is in contact with the nozzle 86 of the flow assisting tool 85, inner plating is applied to the cap nut 1. As shown in the figure, the stopper 37 may be provided in the liquid tank, and the sliding plate 26 may be placed on the stopper 37 so that the sliding plate 26 is in the raised position. Alternatively, the immersion holder 21 may be provided with a driving device such as a motor and moved up and down. These are support member relative position conversion devices. FIG. 4B is an enlarged view of the tip portion of the protruding tube 25. When the sliding plate 26 is in the raised position, the tip portion of the protruding tube 25 is not in contact with the inner surface of the cap nut 1 as shown on the left side of the drawing. In this state, inner plating can be performed. Subsequently, as shown on the right side of (a), the outer surface plating is applied to the cap nut 1 with the sliding plate 26 in a lowered position at the rear part (right side of the drawing) of the semi-gloss tank 59. The enlarged view of the front-end | tip part of a protruding tube is shown on the right side of (b). When the sliding plate 26 is in the lowered position, the tip portion of the protruding tube 25 is in contact with the inner surface of the cap nut 1 as shown in the figure. In this state, a voltage can be applied to perform external plating. The sliding plate 26 is lowered at the front part (left side in the figure) and the sliding plate 26 is raised at the rear part (right side in the figure), and plating is performed in the order of outer plating and inner plating. Also good.

  The voltage application in the case of performing a plating process can be performed by forming a voltage application section that becomes an energization device as shown in FIG. (A) is a figure for demonstrating the electrode application part of the semi-gloss tank 59. FIG. In the front part (left side in the figure) of the semi-gloss tank 59, inner plating is performed, and in the rear part (right side in the figure), outer surface plating is performed. The voltage application units 76 and 78 can apply a negative voltage, and the voltage application unit 77 can apply a positive voltage. Then, the immersion holder 21 is installed in the voltage application units 76, 77, 78. These voltage application units 76, 77, 78 constitute a voltage polarity converter.

  As shown in FIG. 9 (b), when inner plating is performed, the immersion holder 21 is installed in the voltage application units 76 and 77. A negative voltage is applied from the voltage application unit 76 to the support shaft 23a by the power line 79a. Further, a positive voltage is applied from the voltage application unit 77 to the support shaft 23b by the power supply line 79b.

  The inner plating process will be described with reference to FIG. When the inner plating is performed, the sliding plate 26 is set to the raised position (first position). As a result, the head surface 6 of the bag-shaped space of the cap nut 1 and the tip surface 29 of the protruding tube 25 are not in contact with each other and have a gap. In this state, it is immersed in the semi-gloss tank 59, and the immersion holder 21 is installed in the voltage application sections 76 and 77 as shown in FIG. 9, and the negative is supported from the one support shaft 23a to the guide shaft 24a, and the other support is supported. A positive voltage is applied from the shaft 23b to the guide shaft 24b. The guide shaft 24 a and the base portion 27 are electrically insulated by the insulating portion 11. Further, the sliding plate 26 and the guide shaft 24 b are electrically insulated by the insulating portion 13. As a result, a negative voltage is applied from the guide shaft 24 a and the sliding plate 26 to the outer surface of the cap nut 1. Further, a positive voltage is applied to the protruding tube 25 from the guide shaft 24 b and the base portion 27. Since the cap nut 1 is negative and the protruding tube 25 inserted into the bag-like space is applied positively, the inner surface of the cap-like nut 1 is plated. If an external anode is installed and the anode is energized, the outer plating can be performed simultaneously with the inner plating.

  If the cap nut is simply immersed in the plating solution 48 while being held by the immersion holder 21, the inner surface is not sufficiently plated because a gas such as air is present in the bag-like space 5 of the cap nut 1. . Therefore, when inner plating is performed, as shown in FIG. 11A, the gas or liquid in the bag-like space 5 is sucked by a pump 75 as a negative pressure suction device connected to the protruding tube 25 and the flow assisting tool 85. To do. By sucking the gas in the bag-like space 5, the plating solution 48 in the liquid tank flows into the bag-like space and can fill the bag-like space. That is, a voltage for electrolytic plating is applied while flowing the plating solution by suction. Or you may make it apply a voltage after making it flow. Conventionally, since the plating solution 48 does not penetrate into the flange portion of the bag-like space due to the gas filled in the bag-like space 5, the plating process can be performed only around the opening of the bag-like space. The bag-like space 5 can be filled with the plating solution 48 by sucking into the bag nut, and a positive electrode (protruding tube 25) is disposed opposite to the inner surface of the bag nut 1 so that a sufficient current flows through the inner surface of the bag nut. Therefore, the entire inner surface of the cap nut 1 can be plated. When the suction is further continued, the plating solution 48 flows, and a favorable plating process can be performed. Alternatively, as shown in (b), as a pressure discharge device, for example, a pump may be used to eject the plating solution 48 from the protruding tube 25 into the bag-like space 5 of the cap nut and perform the plating process. By spraying, the entire inner surface can be plated. In this case, since pressure is applied to the inner surface, the cap nut 1 may be forcibly fixed by holding the head 3 of the cap nut 1 with a fixing member 41 as shown in FIG. Or you may make it hold | suppress the flange part 7 with the fixing member 42, as shown in FIG.12 (b). In FIG. 11, the protruding tube is inserted into the bag-like space, but the same processing may be performed with the end positioned near the opening as shown in FIG. Also in this case, the inside of the bag-like space 5 can be filled with the plating solution 48, and a sufficient current can flow through the inner surface of the cap nut 1.

  Next, outer plating will be described with reference to FIG. When the outer plating is performed, the sliding plate 26 is set at the lowered position (second position). Then, a negative voltage is applied to the support shaft 23b, the guide shaft 24b, the base portion 27, and the protruding tube 25 by the voltage application unit 78 (see FIG. 9). Further, a negative voltage is applied to the support shaft 23 a, the guide shaft 24 a, the sliding plate 26, and the base portion 27 from the voltage application unit 78. When the sliding plate 26 is in the lowered position, the head surface 6 of the bag-like space of the cap nut 1 is in contact with the tip surface 29 of the protruding tube 25. For this reason, a negative voltage is applied from the protruding tube 25 to the cap nut 1. Further, as shown in FIG. 15, an anode 91 is installed in the semi-gloss tank 59. In this way, the outer surface of the cap nut 1 can be plated by setting the cap nut 1 side to a negative voltage and the anode side to a positive voltage.

  Further, FIG. 16 shows an example in which an auxiliary anode 92 is installed in addition to the anode 91 in the liquid tank. FIG. 16 shows the liquid tank as viewed from above. Anodes 91 are placed opposite to each other in the liquid tank. A plurality of auxiliary anodes 92 are installed between the anodes. The cap nuts 1 held by the immersion holder 21 are respectively installed in the area surrounded by the auxiliary anode. Then, a positive voltage is applied to the anode 91 and the auxiliary anode 92, and a negative voltage is applied to the support shaft 23b, the guide shaft 24b, the base portion 27, the protruding tube 25, and the cap nut 1 by the voltage application unit 78 as described above. Is done. In this manner, the outer surface of the cap nut 1 can be plated. Since the auxiliary anode 92 is installed so as to surround the cap nut 1, the current can flow stably and uniformly, and the outer surface can be plated with a more uniform thickness.

  FIG. 17 shows a modification of the bag-like workpiece holding jig. The immersion holder 110 includes a base portion 27 having a through hole penetrating the upper surface and the lower surface, a protruding tube 25 extending from a through hole on the upper surface side of the base portion 27, a guide shaft 24 extending from the base portion 27, A sliding plate 26 having an insertion hole (through hole) into which the plurality of protruding tubes 25 and the guide shaft 24 are inserted, a support shaft 23 for supporting the guide shaft 24, and a support plate 22 connected to the support shaft 23 are provided. Prepare. And the base part 27 is formed in 3 rows in parallel. By increasing the number of the base portions 27 in this way, many cap nuts can be processed at a time. It is good also as four or more rows. Further, although three protruding tubes are formed on each base portion 27, the number of protruding tubes is not limited to three. Increasing the number of bases and the number of protruding tubes makes it possible to process many bag-like workpieces simultaneously.

  FIG. 18 shows a modification of the bag-like workpiece holding jig. The base portion 27 of the immersion holder 111 has coupling portions 30 that couple each other at both ends. By connecting the base portion 27 with the connecting portion 30 as described above, the base portion 27 and the guide shaft 24 can be stabilized by preventing the base holder 27 and the guide shaft 24 from shaking as the immersion holder 111 moves. Further, the connecting portion 30 is not limited to a shape that connects both ends of the base portion 27. The intermediate region of the base portion 27 may be coupled, or three or more coupling portions 30 may be formed. Further, a similar coupling portion 30 may be formed on the sliding plate 26.

  Another method of inner plating will be described with reference to FIG. As shown in (a), the cap nut 1 held by the sliding plate 126 of the immersion holder is moved onto the plating solution 48. Then, the plating solution is ejected from the protruding tube 125 on the liquid surface. By spraying the plating solution, the entire inner surface of the cap nut 1 can be plated. At this time, the head of the cap nut 1 and the like may be suppressed and fixed so that the cap nut does not move due to the ejection pressure. When the inner plating process is completed, as shown in (b), the cap nut is dipped in the plating solution to perform outer plating.

  The processing liquid circulation method will be described with reference to FIG. FIG. 20 shows a plating bath 151, for example a semi-gloss bath. The plating tank 151 is provided with an outflow pipe 135, a pump 75, and an inflow pipe 136. The cap nut 1 is held by the immersion holder and immersed in the plating tank 151 so that the tip of the outflow pipe 135 is inserted into the bag-like space of the cap nut 1. Alternatively, the protruding tube may be inserted into the bag-like space like the above-described immersion holder 21 and connected to the outflow tube 135 via the flow assisting device 85. In this state, a voltage is applied to the cap nut 1 to perform plating. At this time, gas or liquid in the bag-like space of the cap nut 1 is sucked by the pump 75. The outflow pipe 135 and the pump 75 and the sucked gas or liquid are introduced into the plating tank 151 through the inflow pipe 136. Thereby, a flow occurs in the treatment liquid in the plating tank 151, and the plating efficiency can be increased.

  Note that the present invention can be applied to a cap nut 301 as shown in FIG.

As described above, according to the present invention, semi-gloss plating can be applied to the inner surface of the cap nut and gloss plating can be applied to the outer surface. That is, in terms of a higher level concept, the following plated bag-like members (typically, cap nuts) (1) to (5) can be easily obtained.
(1) A plated bag-like member having a bag-like space opened at an opening, and the outer plating layer is different from the inner plating layer (including a female screw hole in the case of a cap nut). A bag-like member characterized by being in a plating form.
(2) A plated bag-like member having a bag-like space opened at an opening, and an outer plating layer and an inner plating layer (including a female screw hole in the case of a cap nut) are formed. A bag-shaped member, wherein the inner plating layer is thinner than the outer plating layer.
(3) A plated bag-like member having a bag-like space opened at an opening, and an outer plating layer and an inner plating layer (including a female screw hole in the case of a cap nut) are formed. A bag-like member, wherein the inner plating layer is semi-gloss plating and the outer plating layer is bright plating.
(4) A plated bag-like member having a bag-like space opened at an opening, wherein an outer plating layer and an inner plating layer (including a female screw hole in the case of a cap nut) are formed. A bag-shaped member, wherein the inner plating layer is thinner than the outer plating layer, the inner surface is semi-gloss plating, and the outer surface is gloss plating.
(5) A plated bag-shaped member having a bag-shaped space opened at the opening, and formed with an outer plating layer and an inner plating layer (including a female screw hole in the case of a cap nut). A bag-like member, wherein the material of the inner plating layer and the outer plating layer are different from each other.

  In order to confirm the above effects, plating treatment was performed, and the thickness of the plating layer of the cap nut was measured. It was confirmed that the inner surface was sufficiently covered by plating over the entire area.

  Furthermore, using an anode and an auxiliary anode, the outer plating was applied to the nut, and the plating thickness was measured using an overcurrent nondestructive film thickness meter. There was little variation in the measurement location, and almost the same film thickness could be obtained. From the above tests, it was confirmed that when the anodes on both sides and the auxiliary anode were used, the variation in the outer plating film thickness was small and the plating treatment was performed uniformly.

  The suction or ejection of gas or liquid in the bag-shaped space in the above inner plating, the immersion holder, and the auxiliary anode for this purpose are not limited to nickel plating. Furthermore, if a to-be-plated object is a workpiece | work which has a bag-shaped space, it will not be restricted to a cap nut. By performing the inner surface plating and the outer surface plating in different processes, the inner surface and the outer surface can be finished in different plating layers.

A cap nut as an example of a bag-like workpiece in which an immersion holder is used. Example of immersion holder. The expanded sectional view of an immersion holder. The expansion perspective view of an immersion holder. An example of a plating line. The figure explaining operation | movement of the immersion holder in a plating processing line. The figure explaining a flow aid. The figure explaining the use condition of the immersion holder in inner surface plating and outer surface plating. The figure explaining the voltage application part of a liquid tank. The figure explaining the position of a sliding plate and voltage application in inner surface plating. The figure explaining the attraction | suction or discharge of the gas and liquid for performing inner surface plating. The figure explaining fixation of a cap nut. The figure which shows the case where a protruding tube is located in the opening part vicinity. The figure explaining the position of a sliding plate and voltage application in outer surface plating. The figure explaining the anode in a liquid tank. The figure explaining an anode and an auxiliary anode. 2nd Example of an immersion holder. 3rd Example of an immersion holder. The figure explaining the plating process by discharge of a process liquid. The figure explaining the circulation of a process liquid. The figure explaining the conventional immersion holder and plating process. The figure of the cap nut as other examples of a bag-like work.

Explanation of symbols

1 Cap nut 21 Immersion holder 24 Guide shaft 25 Projection tube 26 Sliding plate 27 Base part 59 Semi-gloss tank 72 Transfer line 75 Pump 76, 77, 78 Voltage application part 91 Anode 92 Auxiliary anode

Claims (10)

In order to hold the bag-shaped workpiece having a bag-shaped space in the plating solution so that the opening portion faces downward, the first is supported against the inner surface of the bag-shaped workpiece and supported in the pushed-up state. Using a support member and a second support member that supports the bag-shaped workpiece by sitting instead of the first support member,
The bag-like workpiece is seated on the second support member, and the cathode is applied to the second support member in contact with the bag-like workpiece in a state where the tip of the first support member is separated from the inner surface of the bag-like workpiece. In the state where the voltage which becomes the anode is applied to the first support member which is located in the bag-like space of the bag-like work or in the vicinity of the opening of the bag-like space A first step of performing electrolytic plating on at least the inner surface of the bag-like space of the workpiece;
Before or after the first step, the bag-shaped workpiece is pushed up with the first support member in contact with the inner surface thereof, and the bag-shaped workpiece is separated from the second support member, and the bag-shaped workpiece is A second step of applying electrolytic plating to at least the outer surface of the bag-like workpiece in a state where a voltage serving as a cathode is applied to the first support member in contact with the first support member;
A method for electroplating a bag-like workpiece, comprising: A first support member that contacts the inner surface of the bag-shaped workpiece and supports the bag-shaped workpiece in a pushed-up state so that the opening of the bag-shaped workpiece having a bag-shaped space faces downward in the plating solution;
A second support member that seats and supports the bag-like workpiece instead of the first support member;
The bag-like workpiece is seated on the second support member, and a first position where the tip of the first support member is separated from the inner surface of the bag-like workpiece; and the bag-like workpiece on the inner surface of the first support member. Support that changes the relative position between the first support member and the second support member between the second support member and the second position where the bag-like workpiece is supported by being separated from the second support member. A member relative position conversion device;
A voltage serving as a cathode is applied to the second support member that is in contact with the bag-shaped workpiece at the first position, and is positioned in the bag-shaped space of the bag-shaped workpiece or in the vicinity of the opening of the bag-shaped space. At least the first support so as to apply a voltage serving as an anode to the first support member while applying a voltage serving as a cathode to the first support member that is in contact with the bag-like workpiece at the second position. A voltage polarity conversion device that converts the polarity of voltage application to the member,
In the first position where the bag-like workpiece is seated on the second support member and the first support member is separated from the inner surface of the bag-like workpiece, the voltage that becomes the cathode of the second support member by the voltage polarity conversion device And applying a voltage serving as an anode to the first support member located in the bag-shaped space of the bag-shaped workpiece or in the vicinity of the opening of the bag-shaped space, at least the bag-shaped workpiece In the second position where the bag-shaped space inner surface is subjected to electrolytic plating, the first support member pushes the bag-shaped workpiece into contact with the inner surface, and the bag-shaped workpiece is separated from the second support member. Electrolytic plating is performed on at least the outer surface of the bag-shaped workpiece in a state in which a voltage serving as a cathode is applied to the first support member in contact with the bag-shaped workpiece by the voltage polarity converter. Electrolytic plating apparatus of Jo work. A first support member that contacts the inner surface of the bag-shaped workpiece and supports the bag-shaped workpiece in a pushed-up state so that the opening of the bag-shaped workpiece having a bag-shaped space faces downward in the plating solution;
A second support member that seats and supports the bag-like workpiece instead of the first support member;
The bag-like workpiece is seated on the second support member, and a first position where the tip of the first support member is separated from the inner surface of the bag-like workpiece, and the bag-like workpiece is placed on the inner surface of the first support member. Support that supports the first support member and the second support member so as to be relatively movable between a second position where the bag-like workpiece is supported by being pushed up and separated from the second support member. A member moving mechanism;
A holder for electrolytic plating of a bag-like workpiece, comprising: A body frame connected to the lifting mechanism of the plating line;
A bag-shaped workpiece having a bag-shaped space is supported in a state in which the bag-shaped workpiece is pushed up in contact with the inner surface of the bag-shaped workpiece so that its opening faces downward in the plating solution and fixed to the main body frame. A plurality of first support members that are adjacent to each other at the same height and support one bag-like workpiece,
The first support members are arranged substantially in parallel with the straight line connecting the tips of the first support members, and the plurality of first support members are respectively inserted, and the plurality of bag-like workpieces are seated with their openings facing downward. A second support member provided with a plurality of insertion and support holes for supporting the bag-shaped workpiece instead of the one support member, the height of the second support member being changeable with respect to the first support member;
The bag-shaped workpiece is seated on the second support member, the first position where the tip of the first support member is separated from the inner surface of the bag-shaped workpiece, and the first support member is on the inner surface of the bag-shaped workpiece. The second support member can be moved up and down with respect to the first support member between the second support member and the second position where the bag-like workpiece is supported by being separated from the second support member. A second member guide for guiding;
A holder for electrolytic plating of a bag-like workpiece, comprising: A base portion having a through hole penetrating the upper surface and the lower surface;
A first support member extending from an upper surface of the base portion on the through hole;
A second member guide portion extending from the base portion;
A second support member having an insertion hole into which the first support member and the second member guide portion are inserted, and capable of sliding along the second member guide portion;
A support portion for supporting the second member guide portion;
With
The bag-like workpiece is supported by the first support member or the second support member, immersed in a liquid bath having a plating solution, and the bag-like workpiece is treated with the plating solution. Plating holder.   The head surface of the bag-shaped space of the bag-shaped workpiece is formed by holding the second support member away from the base portion and holding the second support member at a raised position closer to the base portion than the tip surface of the first support member. A negative voltage is applied to the bag-like workpiece by applying a negative voltage to the second support member by bringing the tip end surface of the first support member into a non-contact state and applying a negative voltage to the second support member. The holder for electrolytic plating of a bag-shaped workpiece according to claim 5, wherein the inner surface of the bag-shaped workpiece is treated with the plating solution by applying a voltage of 5.   By sucking a gas or a plating solution that fills the bag-like space of the bag-like workpiece through the through hole of the base portion and the first support member, or the plating solution from the first support member The holder for electrolytic plating of a bag-shaped workpiece according to claim 5 or 6, wherein the inner surface of the bag-shaped workpiece is treated with the plating solution by being ejected.   By lowering the second support member to the lowered position, the tip surface of the first support member comes into contact with the head surface of the bag-like space of the bag-like workpiece, and a negative voltage is applied to the first support member. The electrolysis of the bag-shaped workpiece according to any one of claims 5 to 7, wherein a negative voltage is applied to the bag-shaped workpiece by applying a voltage to perform an outer surface treatment of the bag-shaped workpiece with the plating solution. Plating holder.   The bag-shaped workpiece according to claim 8, wherein a positive electrode is installed in the liquid tank, a negative voltage is applied to the bag-shaped work by immersing in the liquid tank, and the outer surface treatment of the bag-shaped work is performed. Electroplating holder. The holder for electrolytic plating of a bag-shaped workpiece according to any one of claims 3 to 9, wherein at least the first support member and the second support member are formed of a conductor.

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