KR100862479B1 - Rotary type barel coating apparatus - Google Patents

Abstract

A rotary barrel coating apparatus is provided to mix chip parts and media which are received in a barrel vessel and distribute current density uniformly by reciprocating a rotary support shaft which is attached with cathode rods to a shaft direction. A rotary barrel coating apparatus(100) dips a barrel vessel(20) in a barrel plating bath(10). Current is applied to the barrel vessel and an electrolyte respectively through a power applying part. The barrel vessel is rotated in one direction by a driving motor(40) when chip parts(22) are coated. A shaft moving part is installed at one side of the barrel vessel. The shaft moving part includes a cam member(120), a pin member(130), and an elastic member(140). The cam member is formed at one surface of the barrel vessel. One end of the pin member is inserted in a cam groove of a cylindrical rail. A plurality of cathode rods(34) are installed at a rotary support shaft(38). The other end of the pin member is connected with a crank through an opening which is formed at side plate frames(50) fixing cranks(37) and rotary support parts(60a).

Description

Rotary Barrel Coating Apparatus {Rotary Type Barel Coating Apparatus}

1 is a cross-sectional view of a general rotary barrel plating apparatus viewed from the front.

2 is a cross-sectional side view of a general rotary barrel plating apparatus.

Figure 3a) is a cross-sectional view showing a rotary barrel plating apparatus of an embodiment according to the present invention, Figure 3b) is a cross-sectional view showing a modification of the rotary barrel plating apparatus of an embodiment according to the present invention.

Figure 4 is an enlarged cross-sectional view of the shaft moving portion employed in the rotary barrel plating apparatus according to the present invention.

Figure 5a) is a cross-sectional view showing a cam member of one embodiment employed in the rotary barrel plating apparatus according to the present invention, Figure 5b) is a cross-sectional view showing a cam member of another embodiment, Figure 5c) is a cam of another embodiment It is sectional drawing which shows a member.

Figure 6 is a cross-sectional view showing a rotary barrel plating apparatus of another embodiment according to the present invention.

** Explanation of symbols for main parts of drawings **

10: barrel plating tank 20: barrel container

22: chip component 24: medium

30: power supply 34: cathode rod

36: dangler 37: crank

38: rotation support shaft 40: drive motor

110: shaft moving part 120, 120a, 120b: cam member

122: cam groove 130, 130a, 130b: pin member

140: elastic member

The present invention relates to a rotary barrel plating apparatus used to plate a chip component, and more particularly, to a rotary barrel plating apparatus which prevents plating defects by uniformly admixing chip components and media, and improves the coating film thickness distribution. will be.

In general, the process of manufacturing chip components such as varistors, chip inductors, and multi-layer ceramic capacitors (MLCCs) includes: 1) uniformly reacting ceramic capacitor main raw materials with additives 2) mix the synthesized ceramic raw material, polymer binder and solvent, 3) mature the slurry in a stable state, and 4) mature the ceramic slurry to a certain thickness on the polymer film (PET) 5) The formed tape is dried by passing through a drying furnace, and 6) a silk screen is used to print the desired capacitance design value pattern to form an internal electrode, and 7) a paste of the printed internal electrode. In order to maintain the shape, the ceramic sheet is dried in a drying furnace, and 8) the ceramic sheet is laminated in several layers to obtain a desired capacity value. 10) cutting the stacked ceramic bars into chips of a predetermined size, and 11) debinding so that only binders contained in the cut ceramic chips are removed. After the binder is completed, the chip is heat-treated in a high-temperature electric furnace, and then baked. 13) The fired chip is polished to handle sharp edges, and 14) an external electrode is formed outside the chip for connection with an internal electrode formed inside the chip. 15) Heat-treat the chip where the internal and external electrodes are terminated and fix it on the ceramic surface. 16) Nickel and tin plating is applied to the external surface of the chip to give solderability to the external electrode of the chip. The parts are sorted by capacity deviation (J, K, M, Z), and the insulation resistance (IR) defect is sorted. 18) The chip parts are taped and packaged to allow surface mounting.

In the process of manufacturing the chip components as described above, since the termination cannot be soldered immediately, nickel (Ni) and tin (Sn) are sequentially plated with the outermost electrode in order to smoothly solder. The plating method used is barrel plating.

The barrel plating is a method of plating a large amount of articles such as shapes and small chip parts at a time, and friction polishing is performed as the barrel is immersed in the plating bath as the articles and the items come into contact with each other, so that the current is interrupted and the rod of the cathode is interrupted. It is a plating that causes significant gloss on a product because it is plated in contact with it.

1 is a cross-sectional view of a general rotary barrel plating apparatus viewed from the front, and FIG. 2 is a cross-sectional view of a general rotary barrel plating apparatus viewed from the side.

As shown in the related art barrel plating apparatus 1, a barrel plating tank 10 in which an electrolyte is filled, a chip component 22 and a medium 24 to be plated are filled in an inner space, and the barrel plating tank 10 is filled. It consists of a barrel container 20 immersed in the electrolyte, a power supply unit 30 for supplying current to the barrel container 20 and a drive motor 40 for rotating the barrel container 20 in one direction. .

In the barrel container 20 in which the chip component 22 and the medium 24 are mixed, a plurality of cathode rods 34 connected to the cathode portion 32 of the rectifier 30 through the dangler 36 are provided. And a current is supplied through the medium 24. In this case, as the medium 24, steel balls or the like having electrical conductivity are mainly used. In addition, the anode portion 31 extending from the power applying portion 30 is immersed in the barrel plating tank (10).

The dangler 36 has a plurality of cranks 37 which are coupled to the rotary support shaft 38 to allow the barrel container 20 to rotate when the barrel container 20 is rotated, and to the outer side of the barrel container 20. )

The rotation support shaft 38 is a shaft member penetrating through the rotation support portions (60a, 60b) provided on the left and right ends of the barrel container 20, wherein the cathode rod 34 has a constant interval from each other Plurally arranged in a row.

The rotary support parts 60a and 60b are hollow bushing shafts 62, which are fixed members for supporting the rotation of the barrel container 20, and bushes rotatably assembled in the outer surface of the bushing shafts 62. Includes (64), the rotary support (60a) (60b) is on the side plate frame (50) which is disposed at regular intervals on the left and right sides of the barrel container 20 and the left and right sides of the barrel container (20), respectively. It is provided.

In addition, the structure in which the barrel container 20 is rotated in one direction by using the drive motor 40 as a driving source is provided at both left and right ends of the drive gear 42 and the barrel container 20 provided in the drive shaft of the drive motor 40. By engaging the driven gears 44 provided on either side of the rotation support portions 60a and 60b of the barrel, the barrel container 20 rotates the rotation support shaft 38 by the driving force of the drive motor 40. As the center of rotation is rotated, the chip parts 22 and the medium 24 therein are evenly mixed and the chip parts 22 do not stick to each other.

In FIG. 1, reference numeral 66 denotes a spacer 66 to which the bushing shaft 62 is assembled.

However, in the conventional rotary barrel plating apparatus, due to the density difference between the chip parts and the media provided in the barrel container, the chip parts and the media are separated from each other in the barrel container and separated from each other during the rotation of the barrel container for a long time. Becomes

That is, in the state in which the cathode rod attached to the rotary support shaft is fixed, there is a limit to evenly mixing the contents in the barrel container, and thus different current densities are distributed in the barrel container, thereby plating the chip parts. There was a problem that the film thickness deviation occurs, the plating failure rate is increased to lower the product reliability.

Therefore, the present invention has been made to solve the above problems, and its object is to reciprocate the cathode rod inside the barrel container in the direction of the rotation axis of the barrel container so that the chip components and the medium are uniformly mixed, and even distribution of current density. It is an object of the present invention to provide a rotary barrel plating apparatus in which a variation in the thickness of a plating film formed on a chip component in a barrel container is improved.

As a technical means for achieving the above object, the present invention is a barrel plating bath filled with an electrolyte; A barrel container immersed in the barrel plating tank and filled with chip parts and a medium; A power supply unit having a cathode portion and an anode portion to supply current to the barrel container and the electrolyte; A drive motor providing a rotational driving force to the barrel container; A plurality of cathode bars provided on a plurality of rotation support shafts through the barrel container to support rotation of the barrel container, and connected to the cathode part; And a shaft moving unit configured to reciprocate the rotation support shaft in an axial direction using a rotation driving force on at least one side of the barrel container. It provides a rotary barrel plating apparatus for plating a chip component filled in the barrel container including a.

Preferably the shaft moving portion is coupled to one side of the barrel container cam member formed with a cylindrical cam groove; A pin member having one end inserted into the cam groove and the other end attached to a crank integrally coupled with the rotation support shaft; And an elastic member provided to return the crank to its original position. It includes.

Preferably, the shaft moving unit is coupled to both sides of the barrel container, a plurality of cam members having a cylindrical cam groove forming a point symmetry with each other; and one end is inserted into the cam groove from both sides of the barrel container, both sides of the rotary support shaft Two pin members each having another end attached to two cranks integrally coupled; It includes.

More preferably, the cam groove is provided with the highest depth and the lowest depth of the groove one by one and connected in a linear path.

More preferably, the cam groove is provided with a plurality of maximum depth and minimum depth of the groove.

More preferably, the cam groove is connected by a nonlinear path between the highest depth and the lowest depth of the groove.

More preferably, the difference between the highest depth and the lowest depth of the cam groove is provided to be half of the interval between the cathode rods.

More preferably, the elastic member is provided between the crank and the fixed guide such that the pin member always contacts the bottom surface of the cam groove.

More preferably further comprises an additional elastic member further provided on the other side of the barrel container.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3a) is a front view showing a rotary barrel plating apparatus of one embodiment according to the present invention, Figure 3b) is a front view showing a modification of the rotary barrel plating apparatus of an embodiment according to the present invention, Figure 4 is a present invention 5 is an enlarged cross-sectional view of the shaft moving part employed in the rotary barrel plating apparatus according to the present invention, and FIG. 5a) is a sectional view showing the cam member of the embodiment employed in the rotary barrel plating apparatus according to the present invention, and FIG. 5 is a cross-sectional view showing a cam member of another embodiment, Figure 6 is a cross-sectional view showing a rotary barrel plating apparatus of another embodiment according to the present invention.

In the rotary barrel plating apparatus 100 according to the present invention, as shown in FIG. 3A, the barrel container 20 is immersed in the barrel plating bath 10 in which an electrolyte solution containing a metal component is filled, and the barrel container 20 is provided. And the barrel container 20 in one direction by the driving motor 40 during the operation of plating the chip parts 22 accommodated in the barrel container 20 while supplying current to the and electrolyte via the power supply unit 30, respectively. Rotate to drive.

Such a device is provided with a barrel plating bath 10, barrel container 20, power supply unit 30, drive motor 40, etc. having the same configuration as in the prior art, and the same reference numerals are given to these, Detailed description thereof will be omitted below.

The shaft moving unit 110 is provided on at least one side of the barrel container 20, and uses the rotational driving force of the driving motor 40 to support the rotation of the barrel container 20 (38) To reciprocate in the axial direction (P).

The shaft moving part 110 includes a cam member 120, a pin member 130 and an elastic member 140 as shown in FIG.

The cam member 120 is coupled to one side of the barrel container 20, and has a cam groove 122 of a cylindrical rail into which one end of the pin member 130 is inserted and contacted.

As shown in FIG. 5A, the cam groove 122 has a maximum depth point 122a and a minimum depth point 122b of the cam groove 122 and is connected in a linear path. However, the present invention is not limited thereto, and as illustrated in FIG. 5B, the highest depth point 122a and the lowest depth point 122b may be connected to each other by a nonlinear path. In the rotary barrel plating apparatus 100 having the cam groove 122, the pin member 130 inserted into the cam groove 122 is rotated once when the cam members 120 and 120a rotate once. It will reciprocate.

In addition, as shown in FIG. 5C, the cam groove 122 includes a plurality of the highest depth points 122a and the minimum depth points 122b of the groove, so that the pin member 130 is axially rotated when the cam member 120b is rotated one time. You can also make multiple reciprocations with (P).

The difference between the highest depth H and the lowest depth L of the cam groove 122 is half of the distance D between the cathode rods 34 installed on the rotation support shaft 38 in the barrel container 20. It is preferable that this is provided.

The other end of the pin member 130 passes through an opening formed in the side plate frame 50 which fixes the rotation support parts 60a and 60b between the crank 37 and the barrel container 20 to the crank 37. Connected. The crank 37 together with the rotation support shaft 38 constitutes a dangler 36. A plurality of cranks 37 are respectively coupled to both sides of the rotation support shaft 38, and the cathode rod 34 is connected to the power supply unit 30 through the rotation support shaft 38 and the crank 37. It is connected to the cathode 32.

The dangler 36 has the pin member 130 moving from the highest depth point 122a of the cam groove 122 to the lowest depth point 122b when the barrel container 20 is rotated. Direction), the cathode rod 34 attached to the dangler 36 is also moved in the axial direction (the right direction in the drawing).

The pushed dangler 36 is coupled to one end of the elastic member 140 on the opposite side of the side where the pin member 130 is connected. The other end of the elastic member 140 is coupled to the guide 142 connected to the side plate frame 50. The elastic member 140 provides a restoring force to recover to the original position before the dangler 36 is pushed when one end of the pin member 130 is directed to the lowest depth point 122b of the cam groove 122 One end of the pin member 130 is in contact with the cam groove 122 at all times.

In addition, the elastic member 140 may be provided on both sides of the dangler 36 as shown in Figure 3b to increase the restoring force.

Meanwhile, as illustrated in FIG. 6, the shaft flow part 110 may include a plurality of cam members 120a and 120b and a pin member 130.

The cam members 120a and 120b are respectively coupled to both sides of the barrel container 20, and the cylindrical cam grooves 122 provided in the cam members 120a and 120b are formed such that their depths are point-symmetric with each other. do.

One end of the pin member 130 is inserted into the cam groove 122 at both sides of the cam members 120a and 120b, and the other end is attached to the crank 37, respectively.

One end of the pin member 130a inserted into the cam member 120a coupled to one side (right side in the drawing) of the barrel container 20 is the lowest depth point 122b at the highest depth point 122a of the cam groove 122. When moving to the dangler 36 is pushed in the direction of the rotation axis (right direction in the drawing).

At this time, one end of the pin member 130b inserted into the cam member 120b coupled to the other side (left side in the drawing) of the barrel container 20 has the highest depth point (b) at the lowest depth point 122b of the cam groove 122. 122a).

And when the pin member 130b moves from the highest depth point 122a of the cam groove 122 to the lowest depth point 122b, the dangler 36 is pushed in the rotation axis direction (left direction in the drawing) and returned to its original position. The pin member 130a is restored and moves from the lowest depth point 122b of the cam groove 122 to the highest depth point 122a.

As this process is repeated, one end of the pin members 130a and 130b is always in contact with the cam groove 122, and the dangler 36 reciprocates in the direction of the rotation axis P when the barrel container 20 rotates. As a result, the cathode rod 34 attached to the dangler 36 in the barrel container 20 is reciprocated.

The plating of nickel (Ni) and tin (Sn) on the outer surface of the chip component 22 in which the internal and external electrodes are formed using the apparatuses 100, 100 ', and 101 of the present invention having the above-described configuration is first performed. The door (not shown) provided on the outer surface of the barrel container 20 having a predetermined size of inner space is filled with the medium 24, which is a steel sphere, together with the chip component 22 to be plated.

In addition, the power supply unit 30 and the driving motor are lowered from the upper portion of the barrel plating tank 10 in which the door is reassembled from the upper portion of the barrel plating tank 10 containing the electrolyte to be immersed in the electrolyte. When the external power is applied to the 40, the cathode and anode currents are supplied to the barrel container 20 and the electrolyte through the cathode part 32 and the anode part 31 of the power supply part 30, respectively. The barrel container 20 is rotated in one direction by a driving source of the driving motor 40, thereby electroplating the chip component 22.

At this time, the rotary support shaft 38 to which the cathode rod 34 is attached in the barrel container 20 is moved in the axial direction using the rotational driving force of the barrel container 20 by the shaft moving part 110. Reciprocally moved to the barrel container 20, the mixing of the chip component 22 and the medium 24 is made smoothly, which results in an even current density to improve the thickness variation of the plating film and to reduce the plating defect rate will be.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention as set forth in the claims below. I would like to know that those who have knowledge of Easily know.

According to the present invention as described above, by reciprocating the rotary support shaft with the negative electrode rod in the barrel container in the axial direction, the chip parts and the medium accommodated in the barrel container can be uniformly mixed without being separated from each other, accordingly Since the current density distribution is even, it is possible to reduce the plating defects of the chip parts by improving the variation in the thickness of the plated film of the chip parts, and the effect of ensuring better product reliability is obtained.

Claims (9)

A barrel plating bath in which an electrolyte solution is filled; A barrel container immersed in the barrel plating tank and filled with chip parts and a medium; A power supply unit having a cathode portion and an anode portion to supply current to the barrel container and the electrolyte; A drive motor providing a rotational driving force to the barrel container; A plurality of cathode bars provided on a plurality of rotation support shafts through the barrel container to support rotation of the barrel container, and connected to the cathode part; And An axis moving unit for reciprocating the rotation support shaft in an axial direction using a rotation driving force on at least one side of the barrel container; Rotary barrel plating apparatus for plating the chip parts filled in the barrel container including a. According to claim 1, wherein the shaft moving portion A cam member coupled to one side of the barrel container and having a cylindrical cam groove; A pin member having one end inserted into the cam groove and the other end attached to a crank integrally coupled with the rotation support shaft; And An elastic member provided to return the crank to its original position; Rotary barrel plating apparatus comprising a. According to claim 1, wherein the shaft moving portion A plurality of cam members each coupled to both sides of the barrel container and having cylindrical cam grooves symmetric with each other; and Two pin members, one end of which is inserted into the cam groove on both sides of the barrel container, and the other end of which is respectively attached to two cranks integrally coupled to both sides of the rotation support shaft; Rotary barrel plating apparatus comprising a. The method according to claim 2 or 3, The cam groove is a rotary barrel plating apparatus, characterized in that the highest depth and the lowest depth of the groove is provided one by one and connected in a linear path. The method according to claim 2 or 3, The cam groove is a rotary barrel plating apparatus, characterized in that provided with a plurality of the highest depth and the lowest depth of the groove. The method according to claim 2 or 3, The cam groove is a rotary barrel plating apparatus, characterized in that the highest depth and the lowest depth of the groove is connected in a non-linear path. The method according to claim 2 or 3, The difference between the maximum depth and the minimum depth of the cam groove is a rotary barrel plating apparatus, characterized in that half of the interval between the cathode rods. The method of claim 2, The elastic member is a rotary barrel plating apparatus, characterized in that provided between the crank and the fixed guide so that the pin member is always in contact with the bottom surface of the cam groove. The method of claim 2, Rotary barrel plating apparatus further comprises an additional elastic member further provided on the other side of the barrel container.

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