JP2009242924A - Barrel for plating and barrel plating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a barrel for plating and a barrel plating apparatus which can improve the plating quality of a workpiece (article to be plated) by suppressing voltage variation during plating and performing uniform plating and can also improve working efficiency. <P>SOLUTION: The barrel 20 for plating has a body part 23 having a shape of a polygonal cylinder and at least a pair of end plates 30 which are arranged at both of the ends in the axis direction of the body part 23 and close both of the ends of the body part 23. The body part 23 has a body part body 24 constituting a portion in the circumferential direction of the polygonal cylinder and a cap part 26 capable of being detached from the body part body 24. The cap part 26 has a plurality of flat plates 26a which constitute a portion in the circumferential direction of the polygonal cylinder and cross at a prescribed angle. A flange 60 is formed at each end part in the axis direction of the cap part 26, and the flange 60 and the end plate 30 are attachably and detachably connected to/from each other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a plating barrel, and more particularly to a plating barrel and a barrel plating apparatus capable of realizing uniform plating and improving workability.

  In small electronic components such as chip capacitors, chip inductors, and chip varistors, cap-shaped external electrodes are formed as terminals on both ends in the length direction of the ceramic element body, or on both ends in the short direction different from the length direction. Has been. There are also so-called multi-terminal electronic components having many terminals on which external electrodes are formed. Such external electrodes are usually formed in the order of the base layer, the intermediate plating layer, and the outer plating layer from the element body side. The intermediate plating layer and the outer plating layer are generally formed using a barrel plating method.

  As a barrel for plating used in the barrel plating method, for example, as shown in Patent Document 1, a barrel in which one surface of a hexagonal cylindrical body is removable is known. However, in such a barrel, there is a problem that the opening is narrow and it takes time to load and collect the workpiece, which is the object to be plated, and the efficiency deteriorates.

  For such a problem, for example, Patent Document 2 discloses a barrel that has a configuration in which the barrel portion of the barrel is divided into two parts, and can easily load and collect a workpiece. However, in the case of the barrel disclosed in Patent Document 2, since there is a locking member for fixing the divided body part on the outer peripheral part of the body part, the surface on which the locking member exists. And the open area ratio of the through holes in the non-existing surface is different. As a result, there is a problem that the voltage at the time of plating varies and it becomes difficult to form a uniform plating.

Further, since the unevenness is also generated on the inner peripheral surface of the trunk portion, there is a problem that the unevenness causes the workpiece to be scraped up and not in contact with the cathode electrode, resulting in insufficient plating.
Japanese Patent Laid-Open No. 10-317198 Japanese Patent Laid-Open No. 7-188997

  The present invention has been made in view of such a situation, the purpose of which is to suppress the voltage fluctuation during plating, and by performing uniform plating, it is possible to improve the plating quality of the workpiece (to-be-plated), And it is providing the barrel for metal plating and barrel plating equipment which can also improve workability.

In order to achieve the above object, the plating barrel according to the present invention comprises:
A torso having a polygonal cylindrical shape;
A barrel for plating having at least a pair of end plates disposed at both ends of the body portion in the axial direction and closing both ends of the body portion;
The trunk includes a trunk body that constitutes a part of the circumferential direction of the polygonal cylinder, and a lid that is removable from the trunk body.
The lid portion includes a plurality of flat plates that constitute a part of the circumferential direction of the polygonal cylinder and intersect at a predetermined angle;
A flange is formed at an axial end of the lid, the flange and the end plate are detachably connected, and the body main body and the lid are detachably connected. To do.

  In the plating barrel of the present invention, the removable lid has a plurality of flat plates that intersect at a predetermined angle. By doing in this way, the intensity | strength of a cover part can be improved. In addition, since the area of the lid portion is large, the opening of the body portion body after the lid portion is removed becomes large, and it is possible to easily carry in and collect a workpiece, which is an object to be plated, and maintain the cathode. .

  Further, in the plating barrel of the present invention, the body of the trunk and the lid are detachably coupled by detachably coupling the flange of the lid and the end plate. There is no need to provide a fastening member at the connecting portion, and the aperture ratio of the through hole of the flat plate of the trunk portion main body is the same as the aperture ratio of the through hole of the flat plate of the lid portion. As a result, in the body portion, flat plates having a constant aperture ratio are arranged in a polygonal cylindrical shape along the circumferential direction, and even when the body portion is rotated, a current is kept in the body portion at a constant current density. Flow and voltage fluctuation during plating can be suppressed. As a result, uniform plating quality can be realized.

  Moreover, since it is not necessary to provide a fixing tool or a fastener on the outer periphery of the barrel portion of the plating barrel, there are almost no irregular irregularities on the outer periphery of the barrel portion. Therefore, the operation | work which suck | inhales the gas (bubble) etc. which generate | occur | produce at the time of metal plating with a nozzle etc. becomes easy.

  Preferably, the flange and the end plate are detachably attached using a fastener that does not protrude from the attachment surface of the flange toward the lid. By adopting such a configuration, the fastener does not protrude toward the lid portion, and therefore does not shield the through hole formed in the lid portion. It can be kept the same as the flat plate hole area ratio, leading to improved plating quality.

  Preferably, a fastening cam that is engaged by rotation with a tapered cam surface formed on an inner peripheral surface of an attachment hole formed in the flange is formed at the tip of the fastener. By adopting such a configuration, the front end of the fastener does not protrude toward the lid portion, and the flange of the lid portion and the end plate can be attracted and firmly connected.

  Preferably, the end portion in the circumferential direction of the lid portion and the end portion in the circumferential direction of the body portion main body are detachably fitted so that a convex portion does not occur on the inner peripheral surface of the body portion. By configuring in this way, on the inner peripheral surface of the body portion, only a specific workpiece is not caught and stays on the convex portion of the inner peripheral surface, and the entire workpiece is stirred evenly. Uniform plating can be formed throughout.

Preferably, a concave portion for fitting is formed on either one of an end portion in the circumferential direction of the lid portion and an end portion in the circumferential direction of the trunk portion main body,
Any one of the end portion in the circumferential direction of the lid portion and the end portion in the circumferential direction of the trunk portion main body is detachably inserted into the recess for fitting. By adopting such a configuration, the end portion in the circumferential direction of the lid portion and the end portion in the circumferential direction of the trunk portion main body are detachably fitted without causing a convex portion on the inner peripheral surface of the trunk portion. Easy to do.

  Preferably, both end portions in the circumferential direction of the lid portion are formed with recesses for fitting, and both end portions in the circumferential direction of the body portion main body are parallel to each other. By adopting such a configuration, the end portion in the circumferential direction of the lid portion and the end portion in the circumferential direction of the trunk portion main body are detachably fitted without causing a convex portion on the inner peripheral surface of the trunk portion. Easy to do.

  The barrel plating apparatus of the present invention has the above-described plating barrel.

  According to the present invention, it is possible to obtain a plating barrel in which the aperture ratio of the flat plate does not change between the lid portion and the trunk portion. Therefore, the voltage fluctuation at the time of plating can be suppressed effectively, and uniform plating can be realized. Further, since the lid portion has a plurality of flat plates, the strength of the lid portion itself can be ensured, and workability such as loading and collection of workpieces can be improved.

Hereinafter, the present invention will be described based on embodiments shown in the drawings.
FIG. 1 is a schematic sectional view of a barrel plating apparatus using a plating barrel according to an embodiment of the present invention,
FIG. 2 is a schematic exploded perspective view of the plating barrel shown in FIG.
FIG. 3 is a schematic cross-sectional view of the plating barrel shown in FIG.
4 is a schematic enlarged cross-sectional view of the IV portion shown in FIG.
5A is a schematic enlarged cross-sectional view of the VA portion shown in FIG. 3, FIG. 5B is a main cross-sectional view along the line VB-VB shown in FIG.
FIG. 6 is a perspective view of the fastener shown in FIGS. 5 (A) and 5 (B).
FIG. 7A is a view corresponding to FIG. 5A, showing a state before tightening with a fastener, and FIG. 7B is a view corresponding to FIG. It is a figure which shows the state before tightening.

  As shown in FIG. 1, the barrel plating apparatus 2 includes a plating barrel 20 according to the present embodiment in which a workpiece 12 as an object to be plated is accommodated and an anode electrode 8 and accommodates a plating solution 6. And a plating tank 4. Inside the plating barrel 20, an electrode holding rod 22 provided with a cathode electrode at the tip is arranged so that the cathode electrode contacts the workpiece 12.

  The plating barrel 20 is put in the plating solution 6 of the plating tank 4 and a large number of through holes 34 and 36 are formed on the outer peripheral wall of the barrel 20. Is satisfied by. While the electrode holding rod 22 is fixed and the plating barrel 20 is rotated in the direction of the arrow, a current is passed from the power source 10 through the anode electrode 8 and the plating solution 6 toward the cathode electrode at the tip of the electrode holding rod 22. Thereby, an electric current flows with respect to the workpiece | work 12 which is contacting the cathode electrode, and it can plate on a desired location.

  As shown in FIGS. 2 and 3, the plating barrel 20 according to this embodiment includes a barrel portion 23 having a polygonal cylinder shape (an octagonal cylinder in this embodiment), and both axial ends of the barrel portion 23. And at least a pair of end plates 30 that close both ends of the body portion 23.

  A center shaft 28 in which a plurality of electrode holding rods 22 are fixed at predetermined intervals along the axial direction is disposed at the center of the pair of end plates 30. It can rotate in the direction of the arrow shown in FIG. The central shaft 28 does not rotate, and the electrode holding rod 22 is fixed at the position shown in FIG. A conductive line for supplying a cathode voltage to the cathode electrode formed at the tip of the electrode holding rod 22 is built in the center shaft 28.

  The body portion 23 includes a body portion main body 24 that constitutes a part of the circumferential direction of the polygonal cylinder, and a lid portion 26 that can be removed from the body portion main body 24. The lid portion 26 includes a plurality of flat plates 26a that constitute a part of the circumferential direction of the polygonal cylinder and intersect at a predetermined angle. Moreover, the trunk | drum main body 24 also has the some planar plate 24a which comprises the remaining part of the circumferential direction of a polygonal cylinder, and cross | intersects at a predetermined angle. Usually, the number of the plane plates 24 a constituting the trunk body 24 is larger than the number of the plane plates 26 a constituting the lid portion 26.

  In this embodiment, the body portion main body 24 is composed of five plane plates 24a of the octagonal cylinder, and the lid portion 26 is composed of the remaining three plane plates 26a of the octagonal cylinder. In this embodiment, the crossing angle θ between the adjacent flat plates 24a and 26a is 135 degrees, which is an internal angle of a regular octagon.

  In each of the flat plates 24a and 26a, through holes 34 and 36 are formed with the same pitch, the same arrangement, and the same number, respectively. The through holes 34 and 36 have the same inner diameter, preferably φ2 to φ20 mm, preferably φ4 to φ10 mm. The width in the circumferential direction and the length in the axial direction of each of the flat plates 24a and 26a are the same, and the opening ratios by the through holes 34 and 36 are also the same.

  As shown in FIGS. 3 and 4, both end portions 26 b in the circumferential direction R of the lid portion 26 are respectively formed with recesses 40 for fitting, and both end portions 24 b in the circumferential direction of the trunk body 24 are detachable. To fit. In the present embodiment, both end portions 24b in the circumferential direction of the trunk portion main body 24 are parallel.

  In the present embodiment, flanges 50 are formed at both ends of the body portion 24 in the axial direction of the body portion 24. The flanges 50 are each fixed to the end plate 30. The flange 50 and the end plate 30 are fixed by a fastener 80 shown in FIG. 6 to be described later, and may be detachable, but may be fixed by an adhesive. This is because the flange 50 and the end plate 30 need not be detachable.

  A rib 52 similar to the flange 50 is formed integrally with the trunk portion main body 24 at the central portion of the trunk portion 23 in the axial direction of the trunk portion main body 24. The trunk portion main body 24, the flange 50, and the rib 52 are integrally formed of a synthetic resin such as PP (polypropylene) resin, vinyl chloride resin, acrylic resin, fluororesin, or PEEK (polyether ether ketone) resin. The disc-shaped end plate 30 is made of the same or different resin as that of the body main body 24.

  A flange 60 similar to the flange 50 of the lid body 24 is formed at both ends of the lid portion 26 in the axial direction. The flange portion 50 is combined with the flange 50 at the dividing portion 70, so that the disc-shaped end plate 30 and the outer diameter are combined. A substantially disk-shaped flange is formed. In a state where the flange 50 and the flange 60 are combined at the divided portion 70, both end portions 24 b in the circumferential direction of the trunk body 24 are fitted into the fitting recesses 40 as shown in FIG. 3.

  A rib 62 similar to the flange 60 is formed on the outer periphery of the central portion in the axial direction of the lid portion 26, and the rib 52 of the trunk body 24 and the lid are combined with the lid portion 26 and the trunk body 24. The rib 62 of the part 26 continues in the circumferential direction. The lid portion 26, the flange 60 and the rib 62 are integrally formed of the same resin as that of the trunk portion main body 24.

  The lid portion 26 and the trunk portion main body 24 are not directly connected to each other, but the flange 60 of the lid portion 26 is attached to the end plate 30 to which the trunk portion main body 24 is fixed using a fastener 80 described below. Then, the lid portion 26 and the trunk portion main body 24 are connected by being detachably fixed.

  As shown in FIG. 6, the fastener 80 includes a gripping portion 82 that is shaped to be easily grasped by an operator's finger, a cylindrical shaft 84 that extends in the axial direction from the gripping portion 82, and a tip of the cylindrical shaft 84. And a fastening cam 86 formed on the side through a taper portion 85. The tapered portion 85 has an outer diameter smaller than that of the cylindrical shaft 84, and the outer diameter gradually increases toward the fastening cam 86. The fastening cam 86 has an outer diameter that is substantially the same as the outer diameter of the cylindrical shaft 84, but its transverse cross section (cross section perpendicular to the axial direction) is elongated in one direction. In this embodiment, the fastening cam 86 is formed elongated along the longitudinal direction of the gripping portion 82.

  As shown in FIG. 2, attachment holes 31 and 61 are concentrically aligned and formed at one or a plurality of locations along the circumferential direction on the mating surface of the end plate 30 and the flange 60. The cylindrical shaft 84 of the fastener 80 is inserted through the aligned mounting holes 31 and 61 as shown in FIGS. 5 and 7. The inner diameters of the attachment holes 31 and 61 are slightly larger than the outer diameter of the cylindrical shaft 84.

  An attachment plate 62 is fixed or integrally formed on the surface of the lid 60 where the attachment hole 61 is formed in the flange 60. The attachment plate portion 62 is attached so as to be embedded in the lid portion side surface of the flange 60, and has a long hole 64 that is concentric with the attachment hole 61. The cross section of the long hole 64 is adapted to the outer shape of the fastening cam 86 of the fastener 80 shown in FIG. 6, and the longitudinal direction of the fastening cam 86 is shown in FIGS. 7 (A) and 7 (B). The cam 86 is allowed to enter the long hole 64 only when the longitudinal direction of the long hole 64 matches.

  As shown in FIGS. 7A and 7B, after the fastening cam 86 enters the elongated hole 64, the gripping portion 82 is grasped by hand, and about 90 around the axis of the cylindrical shaft 84. When the rotation is rotated by 60 degrees, the fastening cam 86 is also rotated 90 degrees around the axis as shown in FIGS. 5 (A) and 5 (B). As a result, the fastening cam 86 engages with the tapered cam surface 66 formed around the long hole 64 on the lid side surface of the mounting plate 62. The tapered cam surface 66 is formed on both sides of the long hole 64 that is rotated 90 degrees with respect to the longitudinal direction of the long hole 64.

  When the fastening cam 86 is engaged with the tapered cam surface 66, the attachment plate portion 62 and the end plate 30 are attracted to each other in the axial direction. As a result, the end plate 30 and the flange 60 are strongly attracted and connected in the axial direction. In addition, what is necessary is just to extract the fastener 80 from the attachment holes 31 and 61 by operation | movement contrary to the above-mentioned in order to cancel | release connection with the end plate 30 and the flange 60. FIG.

  In the plating barrel 20 according to the present embodiment, the removable lid portion 26 has a plurality of flat plates 26a that intersect at a predetermined angle. By doing in this way, the intensity | strength of the cover part 26 can be improved. Further, as shown in FIGS. 4 and 5, the lid portion 26 and the trunk portion main body 24 are connected via the flange 60 and the end plate 30, so that the lid portion 26 is not bent without being bent. Can be fixed.

  Further, since the area of the lid portion 26 is large, the opening of the body main body 24 after the lid portion 26 is removed becomes large, making it easy to load and collect the workpiece 12 that is the object to be plated, and to maintain the cathode. It can be carried out. Furthermore, maintenance such as replacement of the cathode electrode attached to the tip of the electrode holding rod 22 can be easily performed.

  Moreover, in the barrel 20 for plating of this embodiment, the trunk | drum main body 24 and the cover part 26 are detachably connected by connecting the flange 60 and the end plate 30 of the cover part 26 detachably. In addition, it is not necessary to provide a fastening member at the connecting portion between the body portion main body 24 and the lid portion 26, and the opening ratio of the through hole 34 of the flat plate 24 a of the trunk portion main body 24 and the penetration of the flat plate 26 a of the lid portion 26. The opening ratio of the holes 36 is the same. As a result, in the body portion 23, the flat plates 24 a and 26 a having a constant aperture ratio are arranged in a polygonal cylindrical shape along the circumferential direction, and even if the body portion 23 is rotated, the inside of the body portion 23 is constant. A current flows at a current density of 1, and voltage fluctuations during plating can be suppressed. As a result, uniform plating quality can be realized.

  Moreover, since it is not necessary to provide a fixing tool or a fastener on the outer periphery of the barrel portion 23 of the plating barrel 20, there are almost no irregular irregularities on the outer periphery portion of the barrel portion 23. Therefore, the operation | work which suck | inhales the gas (bubble) etc. which generate | occur | produce at the time of metal plating with a nozzle etc. becomes easy.

  Further, in the present embodiment, the fastening cam 86 of the fastener 80 hardly protrudes from the lid side surface of the flange 60 when the flange 60 and the end plate 30 are fastened, as shown in FIG. For this reason, the fastener 80 does not protrude toward the lid portion and does not shield the through hole 36 formed in the lid portion 26, so that the opening ratio of the flat plate 26 a of the lid portion 26 is set to the flatness of the trunk portion main body 24. It can be kept the same as the hole area ratio of the face plate 24a, leading to improved plating quality.

  Further, in the present embodiment, as shown in FIG. 4, the circumferential end portion 26 b of the lid portion 26 and the circumferential direction of the trunk body 24 are prevented so that no convex portion is generated on the inner circumferential surface of the trunk portion 23. The end 24b is detachably fitted. By configuring in this way, only the specific workpiece 12 shown in FIG. 1 is not caught on the convex portion of the inner circumferential surface and is not retained or scraped up on the inner circumferential surface of the body portion 23, and the entire workpiece 12 is formed. Are uniformly mixed, and uniform plating can be formed on the entire workpiece 12.

  The present invention is not limited to the above-described embodiment, and can be variously modified within the scope of the present invention. For example, in the above-described embodiment, the fitting concave portions 40 are formed in the both end portions 26b in the circumferential direction R of the lid portion 26, and the both end portions 24b in the circumferential direction of the body main body 24 are freely fitted therein. The reverse configuration may be used. In other words, both end portions 26 b in the circumferential direction R of the lid portion 26 may be freely engageable with recesses for fitting formed at both end portions 24 b in the circumferential direction of the body portion main body 24.

  In addition, the shape of the body portion is not particularly limited as long as it is a polygonal shape, but is preferably a hexagonal cylindrical shape or an octagonal cylindrical shape.

  The plating barrel of the present invention is suitably used for manufacturing chip electronic components such as multilayer ceramic capacitors, chip inductors, and chip varistors.

FIG. 1 is a schematic sectional view of a barrel plating apparatus using a plating barrel according to an embodiment of the present invention. FIG. 2 is a schematic exploded perspective view of the plating barrel shown in FIG. FIG. 3 is a schematic cross-sectional view of the plating barrel shown in FIG. 4 is a schematic enlarged cross-sectional view of a portion IV shown in FIG. 5A is a schematic enlarged cross-sectional view of the VA portion shown in FIG. 3, and FIG. 5B is a cross-sectional view of the main part along the line VB-VB shown in FIG. 5A. FIG. 6 is a perspective view of the fastener shown in FIGS. 5 (A) and 5 (B). FIG. 7A is a view corresponding to FIG. 5A, showing a state before tightening with a fastener, and FIG. 7B is a view corresponding to FIG. It is a figure which shows the state before tightening.

Explanation of symbols

2 ... Barrel plating equipment 2
20 ... Plating barrel 23 ... Body 24 ... Body main body 24a ... Flat plate portion 24b ... Circumferential end portion 26 ... Lid portion 26a ... Flat plate portion 26b ... Circumferential end portion 30 ... End plate 31 ... Mounting holes 34, 36 ... Through hole 40 ... Recess 50 for fitting 50 ... Flange 61 ... Mounting hole 64 ... Long hole 66 ... Tapered cam surface 80 ... Fastener 86 ... Fastening cam

Claims (7)

A torso having a polygonal cylindrical shape;
A barrel for plating having at least a pair of end plates disposed at both ends of the body portion in the axial direction and closing both ends of the body portion;
The trunk includes a trunk body that constitutes a part of the circumferential direction of the polygonal cylinder, and a lid that is removable from the trunk body.
The lid portion includes a plurality of flat plates that constitute a part of the circumferential direction of the polygonal cylinder and intersect at a predetermined angle;
A flange is formed at an axial end of the lid, the flange and the end plate are detachably connected, and the body main body and the lid are detachably connected. Barrel for plating.   The plating barrel according to claim 1, wherein the flange and the end plate are detachably attached using a fastener that does not protrude from the attachment surface of the flange toward the lid.   The fastening cam which engages by rotation with respect to the tapered cam surface formed on the inner peripheral surface of the attachment hole formed in the flange is formed at the tip of the fastener. The plating barrel as described.   The circumferential end portion of the lid portion and the circumferential end portion of the trunk body are detachably fitted so that a convex portion does not occur on the inner circumferential surface of the trunk portion. The plating barrel according to any one of the above. In either one of the circumferential end of the lid and the circumferential end of the trunk body, a fitting recess is formed,
5. The plating barrel according to claim 4, wherein any one of an end portion in the circumferential direction of the lid portion and an end portion in the circumferential direction of the body portion main body is detachably inserted into the fitting recess. At both ends in the circumferential direction of the lid, recessed portions for fitting are formed,
The barrel for plating according to claim 5, wherein both end portions in the circumferential direction of the trunk portion main body are parallel.   A barrel plating apparatus having the plating barrel according to claim 1.

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