JP2004256886A - Barrel apparatus for chromium plating - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a barrel apparatus for chromium plating which supplies power to chromium plating at a required high current density, and applies the chromium plating with a uniform film thickness to a small work. <P>SOLUTION: A barrel 2 supported by a frame 1 and oscillating with a horizontal axis as the center is provided with a cathode board 2b having a charge port 2a for a group of works W on its upper face and numberless liquid passing holes on its bottom face. Also, a first anode board 7 supported by a support member 8 fitted to the charge port 2a of the barrel 2 freely attachably and detachably and opposite to the cathode board 2b with a space therebetween is disposed in the barrel 2. Further, a second anode board supported by the frame 1 and disposed below and opposite to the barrel 2 with a space therebetween is provided. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【００１３】
上記表１に示すように、本発明装置により安定良好な３価クロムめっき処理品が得られた。小物ワークとして、パチンコ玉の他、種々の小物ワークにつき試験したが、同様の結果が得られた。
多くの試験の結果、本発明の装置により、陰極盤に電流密度５Ａ／ｄｍ^２ 〜５０Ａ／ｄｍ^２ の範囲の高電流密度が得られ、且つ種類の異なる小物ワーク群に応じて陰極盤に対する第１陽極盤の距離を適宜調節し高電流密度の調節が可能であり、所望の酸化クロム浴を用い、ワークに均一な三価クロムめっきの膜厚が０．３〜０．１μｍの範囲のものが安定良好に得られた。
【００１４】
比較用クロムめっき装置として、陰極から成る網籠を陰極とし、その上下に間隔を存して対向する陽極盤を配置して成るものを用い、実施例と同じ三価クロム浴に浸漬し、電流密度３０Ａ／ｄｍ^２ で１分間めっき処理した後、引き上げ、パチンコ玉を５０個を収容した網籠を手に持ち、水平に揺動せしめた後再び浴に浸漬し同様にめっき処理を行うことを繰り返し、合計７分間のめっき処理を行った。その結果、パチンコ玉群の個々のめっきの膜厚が不均一で、良好なクロムめっきは得られなかった。
【００１５】
更に、比較のため、従来公知の回転バレルの中心に陽極を有するめっき装置を用いて、上記と同じ３価クロム浴で電流密度６Ａ／ｄｍ^２ でパチンコ玉３５０個を５分間めっき処理を施した結果は、全てのワークに部分的にめっきされない所が見られた。
【００１６】
本発明の装置は、装飾用めっき処理工業用めっき処理に適用できる。
尚、第２陽極盤１０は、架枠１の両側板１ａ，１ａに長孔を設け、その上下方向に高さを調節できるようにしてもよい。
【００１７】
【発明の効果】
請求項１に係る発明によるときは、揺動自在のバレルの底面に設けた陰極盤の上下に間隔を存し第１及び第２陽極盤を配設したので、該陰極盤上のワーク群への電気伝導度を高めて、所望の高電流密度を簡単に得ることができ、且つ、バレルの遥動に伴ってワーク群が陰極盤上を常時移動しつつめっきされることができ、各ワークに均一なめっき層を施すことができる。而も、該第１陽極盤は、該バレルの投入口に着脱自在に設けた支持部材に支持させてバレル内に臨ませたため、簡単にバレルから取り外すことができ、該バレルにワークを出し入れするとき、ワークの出し入れの邪魔とならず作業がやり易い。
更に、請求項２に係る発明によるときは、該支持部材に、陰極盤を上下方向の高さ位置を調節可能に設けることにより、陰極盤の電流密度を調節することができると共に、めっきするワーク群を構成するワークの大きさ形状等が違っても簡単に陰極盤上のワーク群と第１の陽極盤との距離を適正なものに設定できる。
更に、請求項３に係る発明によるときは、前記バレルを架枠に着脱可能に設けたことにより、重い架枠は浴槽側に残しバレルのみを取り外してワーク群の取り出し作業を行うことができて、作業性能を高めることができる。
更に、請求項４に係る発明によるときは、バレル内での各種の小物ワーク群の転り状態に応じて、前記バレルの揺動角度を調節することで、ワーク群の陰極盤との良好な接触を保ち、ワーク群に均一な膜厚のクロムめっきを施すことができる。
【図面の簡単な説明】
【図１】本発明実施の一例を示す側面図
【図２】図１の一部を載除した正面図
【図３】図２のＩＩＩ−ＩＩＩ線断面図
【図４】図１のＩＶ−ＩＶ線載断面図
【図５】バレルの斜視図
【図６】支持部材の平面図
【符合図の説明】
１ 架枠
２ バレル
２ｂ 陰極盤
５ バレル収容部
６ 駆動部
７ 第１陽極盤
８ 支持部材、蓋部材
９ 締付ジグ
１０ 第２陽極盤[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a barrel device for performing chrome plating on a group of various small workpieces such as ball bearing balls, pachinko balls, bolts, nuts, and screw nails.
[0002]
[Prior art]
[Patent Document 1] JP-A-56-90998 Conventionally, a barrel apparatus used for applying a gold plating, a tin plating, or the like to a small work group is widely known.
However, in the case of chromium plating which originally requires a high current density, when a plating process is performed using a commonly used rotary barrel device, a strong and constant high current is generated due to the oxidization property of chromium. Inability to obtain density. On the other hand, the individual small workpieces are hooked on the cathode to perform the chrome plating process, but there is a disadvantage that the working efficiency is poor.
[0003]
Therefore, as disclosed in Patent Document 1, there has been proposed an apparatus in which a rotating drum is used as a cathode and an anode is provided at a center position of a rotating barrel.
[0004]
[Problems to be solved by the invention]
However, in the barrel device of Patent Document 1, not only the rotation of the barrel causes poor contact with the barrel in the work group, but also it is difficult to obtain a high current density required for chromium plating. All workpieces were partially unplated. Further, since the anode is provided at the center in the rotating barrel, the distance between the anode and the rotating barrel is constant. It cannot be adjusted and set to a value suitable for various works having different shapes. Furthermore, since the anode cannot be removed, there arises a problem that the anode hinders the work group from being taken in and out of the rotating drum. Therefore, in order to obtain a high current density, a chromium plating apparatus is conceivable in which anodes are arranged above and below the netting basket, but during the chrome plating process, the netting basket is pulled up from the trivalent chromium plating bath. Since the chrome plating process must be performed by repeatedly immersing the basket in the chromium bath after oscillating the netting basket by hand, the plating work is extremely troublesome and troublesome, and is inefficient. No chromium plating of uniform thickness was obtained in the group.
The present invention solves the disadvantages of the conventional barrel device described above, and can easily set the anode to face the inside of the barrel, and easily insert and remove the work group through the insertion port without the anode being in the way. In particular, a trivalent chromium bath can be used to give a high current density required for chromium plating to a small group of small workpieces housed in a barrel, and to perform chromium plating, especially trivalent chromium plating well. It is an object of the present invention to provide a barrel device for chromium plating which can be performed.
[0005]
[Means for Solving the Invention]
The barrel device for chromium plating of the present invention is provided with a cathode panel having a barrel supported on a frame and swinging about a horizontal axis, a work group input port on an upper surface thereof, and an infinite number of liquid holes on a bottom surface. A first anode plate which is supported by a support member detachably attached to the input port of the barrel and faces the cathode plate with a space facing the inside of the barrel; A second anode plate is provided below the barrel and opposed to the cathode plate at an interval.
Further, the present invention is characterized in that in the above-described barrel device for chromium plating, the cathode plate is provided on the support member so that the height position in the vertical direction can be adjusted.
Further, the present invention is characterized in that in the above-described barrel device for chromium plating, the barrel is detachably provided on the frame.
Further, the present invention is characterized in that the swing angle of the barrel is adjustable in the above-described barrel device for chrome plating.
[0006]
[Action]
In the barrel device for chrome plating having the above configuration, the first and second anode plates are arranged above and below the cathode plate provided on the bottom surface of the barrel, so that a desired high current density can be reliably obtained in the cathode plate, In addition, the work group rolls on the cathode plate with the swinging of the barrel, so that a uniform plating layer can be applied to each work.
Also, since the first anode plate is supported by a support member detachably provided at the inlet of the barrel so as to face the inside of the barrel, a work group is charged into the barrel, and after the plating process, In taking out the work group, the work member can be removed together with the support member, and thus the first anode plate does not hinder the work group from being taken in and out, and the work can be easily performed.
Furthermore, by providing the support member with an adjustable mounting position of the first anode plate in the vertical direction, the first anode plate can be adjusted according to the size of small works constituting the work group on the cathode plate. The height position of the first anode plate can be easily adjusted to an appropriate value by changing the height position of the first plate.
Further, by providing the barrel detachably on the frame, when the work group is taken in and out of the barrel, the work group can be taken in and out after removing only the barrel without removing the heavy frame from the bathtub. Can be done, and the putting in and out work can be performed easily.
Further, by making the swing angle of the barrel adjustable, it is possible to apply uniform chromium plating to each work without unevenness while maintaining good contact of the work with the cathode plate.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described in detail with reference to FIGS.
In the drawings, A indicates a barrel device, and the barrel device A includes a frame 1 and a barrel 2 provided on the frame 1 so as to be swingable about a horizontal axis.
More specifically, as shown in FIG. 2, the frame 1 includes side plates 1a, 1a on both sides, and connecting members 1b, 1c for connecting the side plates 1a, 1a on both sides at upper and lower ends thereof. Consisting of The barrel 2 is detachably and directly or indirectly provided on the frame 1 by a desired means, for example, as follows. That is, a box-shaped barrel housing portion 5 provided in the space of the frame 1 is pivotally mounted on the side plates 1a, 1a with shafts 5a, 5a protruding from both ends thereof, and is mounted swingably. The barrel 2 was removably accommodated in the barrel 5. Reference numeral 6 denotes a drive unit for giving the barrel 2 a swinging motion together with the barrel housing 5 around the horizontal axis. The drive unit 6 includes an electric motor 6a provided on an upper portion of an inner surface of a side plate 1a on one side of the frame 1 and a motor provided on an upper portion of an outer surface of the side plate 1a, as is apparent from FIGS. A rotating plate 6c mounted on a rotating shaft 6b of 6a, a rack 6f provided with a laterally long groove 6e into which a pin 6d protruding from the rotating plate 6c is fitted, and an intermediate gear 6g engaged with the rack 6f. By interlocking the intermediate gear 6g with the gear 5a-1 on the shaft 5a protruding from one side of the barrel housing 5, as shown in FIGS. 1 and 2, the rack 6f moves up and down, The barrel accommodating portion 5, that is, the barrel 2 accommodated in the barrel accommodating portion 5 is swung as shown by the arrow in FIG.
As shown in FIG. 4, if the rotary plate 6c is provided with a long groove 6c-1 in the radial direction, and the pin 6d is mounted at a predetermined position of the long groove 6c-1, the mounting position is changed by changing the mounting position. The swing angle of the barrel 2 can be adjusted. In the illustrated embodiment, the swing angle can be adjusted in the range of 80 to 110 degrees. When the swing angle is 75 degrees or less, the rolling effect applied to the work group tends to be small, and when the swing angle is 125 degrees or more, the work group dances and good contact with the cathode plate 2b tends not to be obtained. .
[0008]
The barrel 2 was formed in a substantially octagonal vertical section having an inlet 2a for the work group W on its upper surface and a cathode panel 2b having an innumerable liquid passage hole on its bottom. In more detail, the barrel 2 is formed of a rigid vinyl chloride plate resistant to a trivalent chromium bath to form an octagonal body portion 2c, and a flange 2c-2 is provided around the bottom plate 2c-2. The cathode plate 2b was placed on the lower surface of the bottom plate 2c-1 and the outer peripheral portion was screwed to the flange 2c-2 and attached. The bottom plate 2c-2 was provided with a large opening 2c-3. Further, the cathode panel 2b is provided with portions protruding from both sides of the barrel 2, provided with a conductive rod 2b-1 which rises upward from this portion, and an extremely flexible conductive wire is provided on the upper end of the conductive rod 2b-1. Is connected to energize the cathode panel 2b to remove the barrel 2. When the barrel 2 is removed, the barrel is removed by holding both the conductive rods 2b-1. The cathode plate 2b was made of a brass plate that is strong in a trivalent chromium bath and nickel-plated, and the lower surface was protected by an insulating material. Needless to say, the outer periphery of the conductive rod 2b-1 and the conductive wire connected thereto are covered with an insulating material.
A support member 8 for supporting a first anode plate 7 facing the inside of the barrel 2 is detachably attached to the input port 2a of the barrel 2, and the support member 8 is attached to the input port 2a. The cover member 8 is provided with a relatively large hole 8a for discharging gas (hydrogen gas) generated during the plating operation.
[0009]
The first anode plate 7 is made of a flat plate made of carbon, and a conductive rod 7 a having a pair of outer peripheries extending upward from the upper surface of the first anode plate 7 covered with an insulating coating material is attached to the cover member 8. After being mounted in the provided mounting holes, it is fixed to the support member 8 by tightening with a tightening jig 9. In this case, if the tightening of the tightening jig 9 is loosened, the first anode plate 7 can be easily moved up and down to adjust the gap with the work on the cathode plate 2b.
More specifically, as shown in FIG. 6, the fastening jig 9 includes a pair of holding members 9a, 9a sandwiching each bar 7a and facing both sides thereof. The holding members 9a, 9a are respectively provided with the holding members 9a, 9a. When fastening to the support member 8 with the tap screw 9a-2, there are provided a hole 9a-1 and a hole 9a-1 through which the tap screw 9a-2 is inserted, and the hole 9a-1 and the hole 9a-1 correspond to the tap screw 9a-2. When loosened, the holding members 9a, 9a are elongated grooves in a direction in which the holding members 9a can move forward and backward with respect to the bars 7a, and the holding members 9a located at least on one side of the bars 7a are retracted from the bars 7a, and the anode plate 7 Is adjusted, and then the holding member 9a is pressed against each rod 7a again to tighten the opposing holding members 9a, 9a with the screws 9a-3, 9a-3, and then the holding member 9a is connected to the tap screw 9a-2. To adjust the height of the first anode plate 7 easily. It can be.
[0010]
Reference numeral 10 denotes a second anode plate which is supported by the frame 1 and is mounted to face the lower surface of the barrel 2 with a space therebetween. The second anode plate 10 is made of a flat carbon plate, like the first anode plate 7, and the second anode plate 10 is screwed to the lower end portions of the side plates 1a, 1a near the connecting member 1d. Reference numeral 10a denotes an extremely flexible conductive wire connected to the second anode panel 10.
The basket-shaped barrel storage section 5 is formed of a rectangular box having an open upper surface, and has a large opening 5d for liquid passage on each side thereof. The barrel 2 has end plates 2d, 2d located at both ends thereof. When the barrel 2 is housed in the barrel housing portion 5 as shown in FIG. 4, the outer edges of the end plates 2d, 2d are located in front of and behind the barrel housing space 5 as shown in FIG. The barrel 2 is attached to the inner side surfaces of the side plates 5c, 5c without rattling in the barrel accommodating portion 5, and the outside of the trunk portion 2c is attached without contacting the inner side surface of the barrel accommodating portion 5. The rigid vinyl chloride plate constituting the body portion 2c is provided with countless small holes for liquid passage.
2, 4 and 6, reference numeral 11 denotes a locking bar provided on the upper surface of the lid member 8. The bar 11 has both ends thereof in front and rear side frames of the inlet 2a of the barrel 2. The lid member 8 is detachable from the slot 2a so as to be detachable from the slots 2f, 2f provided in the plates 2e, 2e. In the drawing, reference numeral 11a denotes a bolt and nut for tightening the bar 11.
In the above embodiment, the barrel 2 can be removed from the frame 1. However, if the entire barrel device is small and lightweight, a structure in which the barrel 2 is integrally attached to the frame 1 may be adopted.
[0011]
【Example】
As shown in FIG. 3, the barrel device A is suspended by a fisher 1d provided at the upper end of a frame B, and a known desired trivalent chromium bath, that is, a trivalent chromium ion as a main component, Immersed in a trivalent chromium bath having a pH of 2.0 to 3.0 and a temperature of 20 to 40 ° C. to which additives such as boric acid, an organic buffer, and a complexing agent were selectively added. The number of pachinko balls W shown in Table 1 were placed on the cathode panel, and trivalent chromium plating was performed under the conditions shown in Table 1. After the respective chromium-plated products were subjected to the electrolytic treatment by the electrolytic oxidation method, the results of the salt water test were all satisfactory.
[0012]
[Table 1]

[0013]
As shown in Table 1 above, a stable and good trivalent chromium-plated product was obtained by the apparatus of the present invention. As a small workpiece, various small workpieces were tested in addition to the pachinko balls, and similar results were obtained.
As a result of many tests, a high current density in the range of 5 A / dm ^{2 to} 50 A / dm ² was obtained by the apparatus of the present invention using the apparatus of the present invention. (1) It is possible to adjust the distance of the anode plate appropriately to adjust the high current density, and to use a desired chromium oxide bath and have a uniform trivalent chromium plating film thickness of 0.3 to 0.1 μm on the work. Was obtained with good stability.
[0014]
As a comparative chromium plating apparatus, an apparatus in which a mesh basket composed of a cathode is used as a cathode and anode plates facing each other are arranged above and below the cathode, and immersed in the same trivalent chromium bath as in the example, After plating for 1 minute at a density of 30 A / dm ² , pull up, hold a net basket containing 50 pachinko balls in hand, shake it horizontally, and then immerse it again in the bath to perform plating in the same manner. The plating was repeated for a total of 7 minutes. As a result, the thickness of each plating of the pachinko ball group was not uniform, and good chromium plating could not be obtained.
[0015]
Further, for comparison, 350 pachinko balls were plated at a current density of 6 A / dm ² in the same trivalent chromium bath for 5 minutes using a conventionally known plating apparatus having an anode at the center of a rotating barrel. As a result, it was found that all the workpieces were not partially plated.
[0016]
The apparatus of the present invention is applicable to decorative plating and industrial plating.
The second anode plate 10 may be provided with long holes in both side plates 1a, 1a of the frame 1 so that the height can be adjusted in the vertical direction.
[0017]
【The invention's effect】
According to the first aspect of the present invention, the first and second anode plates are arranged above and below the cathode plate provided on the bottom surface of the swingable barrel with a space therebetween. The electrical conductivity of the workpiece can be easily increased to obtain a desired high current density, and the workpieces can be plated while constantly moving on the cathode panel as the barrel moves. Can be provided with a uniform plating layer. Since the first anode plate is supported by a support member detachably provided at the input port of the barrel and is exposed inside the barrel, the first anode plate can be easily removed from the barrel, and a work can be taken in and out of the barrel. At this time, the work can be easily performed without obstructing the loading and unloading of the work.
Furthermore, according to the invention according to claim 2, by providing the cathode plate on the support member so that the height position in the vertical direction can be adjusted, the current density of the cathode plate can be adjusted and the work to be plated can be performed. The distance between the work group on the cathode plate and the first anode plate can be easily set to an appropriate value even if the sizes and shapes of the works constituting the group are different.
Furthermore, according to the third aspect of the invention, by providing the barrel detachably on the frame, the heavy frame can be left on the bathtub side and only the barrel can be removed to perform the work of taking out the work group. , Work performance can be improved.
Further, according to the invention according to claim 4, by adjusting the swing angle of the barrel according to the rolling state of the various small workpieces in the barrel, a good contact between the workpiece group and the cathode plate can be obtained. Contact can be maintained, and chromium plating with a uniform film thickness can be applied to the work group.
[Brief description of the drawings]
FIG. 1 is a side view showing an embodiment of the present invention. FIG. 2 is a front view showing a part of FIG. 1 removed. FIG. 3 is a sectional view taken along the line III-III of FIG. 2. FIG. IV line mounting sectional view [Figure 5] Perspective view of barrel [Figure 6] Plan view of support member [Explanation of sign]
DESCRIPTION OF SYMBOLS 1 Frame 2 Barrel 2b Cathode board 5 Barrel accommodating part 6 Drive part 7 First anode board 8 Supporting member, lid member 9 Fastening jig 10 Second anode board

Claims (4)

A barrel supported by a frame and swinging about a horizontal axis is provided with a work group input port on its upper surface and a cathode panel having countless liquid holes on its bottom surface, and the barrel is charged. A first anode plate, which is supported by a support member detachably attached to the mouth and faces the cathode plate at an interval from the cathode plate, faces the inside of the barrel, and is further supported by the frame to lower the barrel below the barrel. A barrel device for chromium plating, comprising a second anode plate facing the cathode plate with a space therebetween. The barrel device for chromium plating according to claim 1, wherein the cathode plate is provided on the support member such that a height position in a vertical direction is adjustable. The barrel device for chromium plating according to claim 1 or 2, wherein the barrel is detachably provided on the frame. 4. The barrel device for chrome plating according to claim 1, wherein the swing angle of the barrel is adjustable.

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