JP3529533B2 - Work gripping mechanism of plating equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for improving a work holding mechanism in a plating apparatus.

[0002]

2. Description of the Related Art A piston rod, which is an example of a rod-shaped work, is plated for the purpose of preventing rust and adding wear resistance. For example, FIG. 1 of Japanese Utility Model Publication No. 52-16258, "Workpiece Supporting Structure for Electrolyte Solution Bath" shows the principle of a plating device and a work gripping tool for a rod-shaped work. The main part of the figure is shown again in the next figure. However, the code was reassigned.

FIG. 15 is a principle diagram of a conventional work holding mechanism, in which a work 202 is held by a clamper 201 and most of the work 202 is immersed in a plating solution 203. When the work 202 is a piston rod, there is a threaded portion at the end of the rod, and it is not necessary to plate the threaded portion because a nut is later screwed onto this threaded portion. Therefore, the end 202a of the work 202 is not immersed in the plating solution 203.

[0004]

FIG. 16 is an operation diagram of FIG. 15, in which hydrogen gas is generated around the work 202 on the cathode side as the plating process progresses. This hydrogen gas becomes bubbles 205 ... (... indicates a plurality, and the same applies to the following.) And floats up along the work 202 to push up the liquid surface of the plating solution 203 as shown in the figure. is there. When the current value is increased to promote the plating process, the tendency becomes remarkable, and the work 2
The plating solution 203 rises up to the end 202a of 02, and as a result, the end 202a is also plated. Further, there is a problem in that the clamper 201 is also plated by the trailing edge of the plating solution 203.

If the plating speed is lowered in order to reduce the rise of the liquid surface, the production amount becomes small, which is not preferable. Therefore, assuming the height of the rise, the clamper 20
A method of increasing 1 can be considered. However, the rising height of the liquid surface is unstable, and the plating thickness of the portion that must be plated also fluctuates because it fluctuates, and this method also has problems.

[0006]

In order to solve the above-mentioned problems, a work gripping mechanism according to a first aspect of the present invention is such that the upper end of a rod-shaped work is
The steel collet chuck to grip and this collet chuck
It has an opening only at the lower end, which is
Non-conductive, extending below the lower edge of the chuck
The work gripping mechanism of the plating machine equipped with the outer cylinder of
The internal cylinder is built into the external cylinder, and this internal cylinder is suspended by the support plate.
Support, forming a tapered cone portion at the bottom of the inner cylinder,
The collet chuck is installed inside the tapered cone,
A spring for urging this collet chuck downward.
Is provided, and the collet is prevented against the spring force of this spring.
Push up the chuck with the upper end of the rod-shaped work and push it up.
Raise the gnarled collet chuck from the tapered cone.
The collet chuck with the expanded diameter
It is characterized in that it is configured to be gripped . In claim 1
According, the collet chuck <br/> for gripping the upper end of the rod-shaped workpiece, surrounds the collet chuck has an opening only at the lower end, the non-conductive opening is extended to further lower than the lower end of the collet chuck It is composed of the outer cylinder. In the outer cylinder, since the liquid level is almost at the level of the opening, the plating start line is clear.

The work gripping mechanism according to claim 1 is a rod-shaped work.
The member that holds the upper end of the is a collet chuck
Is characterized by. Collet chuck has a large effective holding area
Since the gripping force is strong, there is no need to worry about the work piece falling off.
Moreover, the energization amount can be increased.

According to a second aspect of the present invention , in the work gripping mechanism,
Above the lower end of the collet chuck
Characterized by having one or more through holes opened in the outer cylinder
It In the outer cylinder, the liquid level is almost at the level of the through hole.
Therefore, the plating start line is clear. Moreover, the number of through holes
The plating thickness can be changed by changing the diameter, shape or shape.
Can be done.

According to a third aspect of the present invention, there is provided a work gripping mechanism in which the inner cylinder is
A steel member is used, and the collet chuck and the tapered core are
Interposed an insulating material on at least one between or between the inner tube and down portion and the supporting plate, before the said collet chuck
The structure that prevents current from flowing through the inner cylinder
Characterize . Since the insulating material is interposed between at least one of the collet chuck and the tapered cone portion or between the steel inner cylinder and the support plate, the collet chuck and the tapered cone portion are in a non-conductive state. Since no current flows through the tapered cone portion of the collet chuck at the time of plating process, the workpiece → collet chucking click route can be efficiently energization, it is increased production efficiency. Further, by using the steel inner cylinder, the inner cylinder can be easily processed, the cost can be reduced, and a desired strength can be obtained.

According to a fourth aspect of the present invention, there is provided a work gripping mechanism in which the inner cylinder is
Use a non-conductive member to charge the inner cylinder from the collet chuck.
Characterized by being configured to prevent the flow of water
It Since using the non-conductive of the inner cylinder, when the plating workpiece → can be efficiently energized with collet chucking click route, it is increased production efficiency. Further, by using the inner tube of non-conductive, as claimed in claim 3, to be interposed in at least one of or between the inner cylinder and the support plate of the collet chuck and the tapered cone portion of the insulating material There is no.

[0011] workpiece holding mechanism according to claim 5, the mounting Rukoto vertically movably said non-conductive outer cylinder to the inner cylinder,
The liquid level around the rod-shaped work has been changed.
It is characterized in that it is configured to be adjusted according to the peak . The liquid level around the work can be adjusted by moving the outer cylinder up and down.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of the reference numerals. FIG. 1 is a view showing an example of a cylinder unit provided with a rod-shaped work according to the present invention, which will be described in a vertically oriented state. A cylinder unit 1 which is practically used as a vehicle suspension has a piston 4 built in a cylinder 2 and a piston rod 5 having a base connected to the piston 4.
Is extended to the outside of the cylinder 2. Since the piston rod 5 is in sliding contact with the oscil seal 6, hard chromium plating is applied to this portion to prevent wear.

FIG. 2 is a diagram of a piston rod as a rod-shaped work according to the present invention. FIG.
The same direction as. Since the large diameter portion 5a of the piston rod 5 is a portion in sliding contact with the oil seal 6, it is necessary to perform a plating treatment. Medium diameter parts 5b, 5 connected to this
Plate c to prevent rusting. The lower threaded portion 5d is preferably not plated because a metal fitting (not shown) is screwed in.
The upper threaded portion 5e is not plated because the nut for fixing the piston is screwed in. An apparatus for performing such a plating process will be described next.

FIG. 3 is a sectional view of an electroplating apparatus according to the present invention. In the electroplating apparatus 10, horizontal members 12, 12 are attached to the upper portions of the pillars 11, 11 that are erected from the foundation, and the rails 13 are passed to the horizontal members 12 lined up in the front-back direction of the drawing, and the two rails 13, 13 are self-running. The table 15 is bridged, and the work support mechanism 20 is provided on the self-propelled table 15 (detailed configuration will be described later).
Is a device for suspending a plurality of rod-shaped works, that is, piston rods 5 ... On the work supporting mechanism 20, and immersing the work in a plating tank 30 arranged below to perform plating processing.

The work supporting mechanism 20 comprises a work lifting cylinder 21, guides 22 and 22, a lifting support plate 23, and a work holding mechanism 60 ... (Detailed structure will be described later). By the action, the work gripping mechanism 60 ... The self-propelled table 15 includes a traveling motor 16, a pinion 17, and a rack 18.
With, it is possible to travel in the front and back direction of the drawing.

The plating tank 30 is provided with a service tank 32, supplies a plating solution whose components are controlled into the tank through a pump 33 and a supply pipe 34, and supplies the plating solution through a return pipe 35 to the service tank 32. Can be returned to. The plating tank 30 includes an anode 36 for electroplating, an anode side bus bar 37, a cathode pedestal 38, and a cathode side bus bar 39. The plating tank 30 has a masking jig 4 inside.
Equipped with 0.

Masking jig 40 (Detailed structure is shown in FIG.
This will be explained in Section 5. ) Is held by a jig elevating mechanism 50 described below, and its height position can be adjusted. Jig lifting mechanism 50
Is a substantially U-shaped lift frame 52 that supports the masking jig 40 ..., Nut members 53 and 53 that support both ends of the lift frame 52, and these nut members 5
Elevating screws 54, 54 for elevating and lowering 3, 53, transmission rods 55, 55 for rotating the elevating screws 54, 54, and bevel gears 56, and an elevating motor directly connected to one driving screw 54. 57 and a rotation detector 58 directly connected to the other driving screw 54.

FIG. 4 is a cross-sectional view of the masking jig, and the masking jig 40 is preferably made of polytetrafluoroethylene which is rich in insulation and chemical resistance, in which an inverted truncated cone-shaped recess 41 is formed. Become. The recess 41 has a larger diameter than the outer diameter d1 of the threaded portion 5d of the piston rod 5 as the work. For example, when the bottom diameter of the recess 41 is D1 and the inlet diameter is D2, D1 = ( 1.2-1.5) × d
1, D2 = (1.6 to 2.5) × d1. 42 is
It is a small hole for drainage, and is for discharging the drain accumulated at the bottom of the recess 41.

FIG. 5 is a sectional view of another embodiment of the masking jig. The masking jig 40 has a through hole 43 having a diameter larger than that of the threaded portion 5d of the piston rod 5. Outer diameter d of the threaded portion 5d of the piston rod 5 as the work
1 and the diameter D3 of the through-hole 43, D3 = (1.5
~ 2.2) xd1.

FIG. 6 shows a work gripping mechanism according to the present invention (first
It is sectional drawing of (Example). The work gripping mechanism 60 includes a non-conductive resin outer cylinder 61, a steel inner cylinder 62 built in the outer cylinder 61, a tapered cone portion 63 formed under the inner cylinder 62, and a cone portion 63. An internal steel collet chuck 64, a steel chuck holding member 65 for holding the collet chuck 64, a copper rod 66 for supplying power to the chuck holding member 65, and the collet chuck 64 urged downward. Springs 67 and 6 for
7 and a resin guide 68 also serving as a spring retainer. 71, 71 are insulating rings, 72 ... Hexagon socket head cap bolts, 73, 74, 75 are O-rings, 76
Is a top cover, 77 is a lead wire, 78 is a copper plate, 7
9 is a steel plate, and 81 ... are mounting bolts.

The collet chuck 64 is a combination of, for example, four divided blocks 64a .. When the collet chuck 64 is moved up and down in the figure, the diameter of the collet chuck 64 changes due to the taper action of the cone portion 63. Long slit 6 is also provided on the upper chuck holding member 65.
The divided block 64a ...
・ Does not hinder the radial movement of. The collet chuck 64 and the chuck holding member 65 are joined by the bolts 72 ... The collet chuck 64 grips the work and faces the plating solution, so that the life is shortened. On the other hand, since the chuck holding member 65 has a complicated shape, it is desired to use it for a long time. Therefore, the structure is such that the collet chuck 64 can be replaced.
However, the collet chuck 64 and the chuck holding member 65
It does not matter that the machined parts are machined together.

The insulating rings 71, 71 are arranged at both ends of the lower spring 67, and the insulating ring 71 and the insulating resin guide 68 are arranged at both ends of the upper spring 67. It is a measure to do so. When the springs 67, 67 are energized, their life is shortened, and this is a measure to prevent this.

An example of the assembling order of the work holding mechanism 60 will be described. First, the collet chuck 64, the chuck holding member 65 and the copper rod 66 are assembled in series, and the insulating rings 71, 71, the springs 67, 67 and the resin are attached to them. Fit the guide 68. The assembly is placed in the inner cylinder 62, the outer cylinder 61 is covered, and the top cover 76 is further covered. Insert these into the copper plate 78 from below and put the bolts 8
1. Attach the lead wire 77 at that time.

7 (a) to 7 (c) are explanatory views of the operation of the collet chuck. At (a), the collet chuck 64 is pushed up by the top of the piston rod 5. Then,
In (b), the collet chuck 64 moves up the cone portion 63, and the collet chuck 64 expands accordingly. When the diameter of the grip hole of the collet chuck 64 becomes larger than the top of the piston rod 5, the top of the piston rod 5 enters as shown in (c). When the piston rod 5 is lowered in this state, the collet chuck 64 contracts and grips the piston rod 5. Since the collet chuck 64 has a large gripping area, there is no fear of scratching the work.

The operation of the electroplating apparatus described above will be described below. In FIG. 3, the height of the masking jig 40 is adjusted according to the length of the piston rod 5 to be plated. On the other hand, the traveling motor 16 is operated to move the work to the plating tank 30, and at that position, the work lifting cylinder 2
1 is operated to lower the work.

FIG. 8 is an operation diagram of the electroplating apparatus according to the present invention, showing a state in which the elevating support plate 23 is placed on the cathode receiving base 38. Next, a predetermined voltage is applied between the anode 36 ... And the piston rod 5 through the anode side bus bar 37 and the cathode side bus bar 39. Then, metal ions (Cr ions or the like) in the plating solution are directed toward the piston rod 5 on the cathode side, and the metal starts to be reduced and deposited.

In FIG. 4, conceptually, the metal ion Mi is
1 reaches the piston rod 5, and the metal M is reduced and deposited there. On the other hand, the metal ions Mi2 and Mi3 are blocked by the masking jig 40. However, since there is a gap S between the recess 41 and the threaded portion 5d, the metal ion Mi4 is discharged from this gap.
There is also one that goes around and reaches the screw portion 6d. According to the research conducted by the present inventors, the gap S has a radius (1 / 2d
If it is within 1), the penetration amount of the metal ion Mi4 is acceptable. If the opening of the concave portion 41 is too small, it becomes difficult to insert the threaded portion 5d of the piston rod 5, and therefore, at least 1.6 × d1. The same applies to FIG.

Returning to FIG. 8, when the plating process is completed, the energization is stopped, the work lifting cylinder 21 is operated, and the lifting support plate 23 is lifted. In FIG. 3, the traveling motor 16 is operated to move the lift support plate 23 to the next tank.
Therefore, only the piston rod 5 is moved while the masking jigs 40 ... Are left in the plating tank 30. With this masking jig 40, the subsequent piston rod 5
Since it masks, work efficiency is good. In addition, the masking jig 40 is kept waiting in the lower position, and the piston rod 5
After the descent, the position may be raised and aligned.

Next, the operation of the work gripping mechanism 60 of the present invention will be described. FIGS. 9A to 9C are explanatory views of the operation of the work holding mechanism (first embodiment), and FIG. 9A shows a state in which the piston rod 5 is being lowered to the plating liquid 83.
(B) shows a state in which the piston rod 5 is lowered to a predetermined level. At this time, the lower portion of the outer cylinder 61 is covered with the plating solution 83.
Soak in. As shown in FIG. 6, the outer cylinder 61 is a container in which the upper and side surfaces are hermetically sealed and only the lower part is opened. Therefore, the level of the opening 61 a of the outer cylinder 61 becomes substantially the liquid level 84 around the piston rod 5.

(C) shows the plating process, in which hydrogen gas is vigorously generated around the piston rod 5 and bubbles 8 thereof are generated.
5 rises along the piston rod 5. This bubble 85
Does not enter into the outer cylinder 61 because the outer cylinder 61 is a closed space, and as a result, reaches the outside of the outer cylinder 61 to reach the plating solution 83.
Push up. That is, the liquid level 84 in the outer cylinder 61 hardly changes before and after the plating process. Therefore, it is possible to accurately plate only the desired portion of the shaft end of the piston rod 5. Since the outer cylinder 61 is made of non-conductive resin, there is no concern that the plating will adhere even if it is submerged in the plating liquid 83.

FIG. 10 is a sectional view of the work holding mechanism (second embodiment) according to the present invention, and the work holding mechanism 60 of FIG.
The same parts as in FIG. It is characterized in that the non-conductive resin outer cylinder 61 is provided with through holes 61b at a distance L from the lower end.

11 (a) to 11 (c) are explanatory views of the operation according to the second embodiment. (A) shows a state in which the piston rod 5 is submerged in the plating liquid 83, and the liquid level 84 in the outer cylinder 61 is almost at the level of the through hole 61b. (B) shows that the plating process is in progress, and since the bubbles 85 cannot enter the closed space inside the outer cylinder 61, they go outside the outer cylinder 61 and push up the plating solution 83, so that accurate plating can be performed.

FIG. 5C is an enlarged view of the main part of FIG.
Similarly, the metal ion Mi1 reaches the work and deposits the metal there, while the metal ions Mi2 and Mi3 move to the outer cylinder 61.
Since it is blocked by, it does not deposit metal. But the opening 6
Metal ion Mi4 wraps around from 1a, so plating 87
However, the lower part is thicker and the upper part is thinner, and it can be formed in an inclined shape.
Further, since the metal ions Mi5 enter through the through holes 61b ..., Plating can be formed. The metal ion Mi5 increases almost in proportion to the total area of the through holes 61b, and if it increases, the plating thickness increases. That is, the level of the liquid surface 84 in the outer cylinder 61 can be determined by opening one or more through holes 61b, and the number of the through holes 61b, the diameter, and the shape (such as an oval) can be changed so that the plating 87 The thickness can be adjusted.

FIG. 12 is a sectional view of a work holding mechanism (third embodiment) according to the present invention. The work gripping mechanism 90 includes a steel inner cylinder 92 bolted to the elevating support plate 23 via a first insulating member 91, a tapered cone portion 93 formed below the inner cylinder 92, and the inside of the cone portion 93. A second insulating member 94 disposed around the circumference, a steel collet chuck 95 inscribed in the second insulating member 94, and a steel chuck holding member 96 formed on the upper portion of the collet chuck 95,
A non-conductive resin outer cylinder 97 fitted to the outer circumference of the steel inner cylinder 92, and height adjusting means 9 for adjusting the height of the outer cylinder 97.
8 and. Reference numeral 103 is a spring, 104 is a resin guide which also serves as a spring retainer, 106a and 106b are O-rings, 107 is a top cover, 108 is a lead wire, 109 is an insulating ring, 110 ... (Only one is shown). It is a mounting bolt. The insulating ring 109 is arranged as a measure for not energizing the spring 103.

The collet chuck 95 and the chuck holding member 96 are divided into four by slits 96a, and the collet chuck 95 is a combination of four divided blocks 95a ... Like the first embodiment. The collet chuck 95 changes its diameter by the taper action of the second insulating member 94 by moving up and down in the figure. The first and second insulating members 91 and 94 are made of Bakelite (trademark) or the like to prevent a stray current from flowing from the collet chuck 95 to the steel inner cylinder 92. The first insulating member 91 includes insulating plates 91a and 91a and an insulating collar 91b. Only one of the first and second insulating members 91 and 94 may be used, and the first and second insulating members 91 and 94 may be omitted and the steel inner cylinder 92 may be made of a ceramic material or the like. It may be changed to a conductive member. Height adjusting means 9
8 is a vertical guide groove 99 formed on the outer circumference of the steel inner cylinder 92.
… And screwed into the resin outer cylinder 97 and the vertical guide groove 99
… Stud 100 inserted inside… and Stud 100…
It is composed of a nut 101 ...

13 (a) and 13 (b) are explanatory views of the operation according to the third embodiment. (A) shows a state in which the medium diameter portion 5c of the piston rod 5 is relatively long and is plated. Since the plating position of the piston rod 5 is lowered, the height adjusting means 98 fixes the resin outer cylinder 97 downward, and the liquid level 84 around the piston rod 5 is lowered. (B) shows a state where the medium diameter portion 105c of the piston rod 105 is plated with a relatively short diameter. Since the plating position of the piston rod 105 rises, the height adjusting means 98 raises the resin outer cylinder 97 to raise the liquid level 8 around the piston rod 105.
Raise 4

FIGS. 14 (a) and 14 (b) are explanatory views of current flows between the work holding mechanism (first embodiment) and the work holding mechanism (third embodiment). In (a), a current flows to the collet chuck 64 via the piston rod 5 during the plating process, and the current flowing to the collet chuck 64 is lifted and supported via the chuck holding member 65, the copper rod 66, and the lead wires 77 and 77. Pour on plate 23. On the other hand, part of the current flowing through the collet chuck 64 is part of the steel inner cylinder 6
2 to the lifting support plate 23. This current may cause electrolytic corrosion due to the voltage difference on the collet chuck 64 side.

In (b), an electric current flows to the collet chuck 95 via the piston rod 5 during the plating process, and the electric current that has flowed to the collet chuck 95 passes through the chuck holding member 96 and the lead wire 108 to the lifting support plate 2.
Flush to 3. As described with reference to FIG. 14, since the work gripping mechanism 90 of the third embodiment has the first and second insulating members 91 and 94 arranged therein, a current flows from the collet chuck 95 to the tapered cone member 93 and the steel inner cylinder 92. Not flowing. Therefore, the occurrence of electrolytic corrosion due to the voltage difference on the collet chuck 95 side can be prevented, and the life of the collet chuck 95 is extended. Also,
Since the diameters of the chuck holding member 96 and the lead wire 108 are made large, a desired amount of current can be passed, and the flow path of the current is simple, so that variations in the plating film thickness can be eliminated.

[0039]

[0040]

The present invention has the following effects due to the above configuration. Workpiece holding mechanism according to claim 1, the steel collet chuck for grasping the upper end of the rod-shaped workpiece, the Korettochi
Surrounds the jack has an opening only at the lower end, the opening Kore
And a non-conductive outer cylinder that extends further below the lower end of the chuck . In the outer cylinder, since the liquid level is almost at the level of the opening, the plating start line is clear.
Further, since there is no concern that the collet chuck is splashed with the plating solution, the life of the collet chuck becomes long, the period until the replacement of parts becomes long, and the production efficiency can be improved. Further, in the work gripping mechanism of claim 1, the inner cylinder is attached to the outer cylinder.
It is built in, and this inner cylinder is hung and supported by a support plate.
Form a tapered cone part at the bottom, and in this tapered cone part
The collet chuck is built in, and this collet chuck is
Is provided with a spring for urging downward. Therefore,
Place the collet chuck in a rod-shaped work against the spring force of the spring.
Push the collet chuck up at the upper end of the
Expand the diameter by raising it from the tapered cone and expand the diameter of the collet.
The rod-shaped work can be gripped by the chuck .

The workpiece gripping mechanism according to claim 1 is a rod-shaped workpiece.
The member that holds the upper end of the is a collet chuck
Is characterized by. Collet chuck has a large effective holding area
Since the gripping force is strong, there is no need to worry about the work piece falling off.
Furthermore, increase the power supply capacity by increasing the current-carrying area.
Therefore, the plating time can be shortened and the production efficiency can be improved.
Can be raised to

According to a second aspect of the present invention , in the work gripping mechanism,
Above the lower end of the collet chuck and open to the outer cylinder.
It has one or more through holes. Liquid level in the outer cylinder
Since it is almost the level of the through hole, the plating start line is
To Moreover, changing the number, diameter and shape of the through holes
More easily, the plating with an inclined thickness can be applied to the upper end of the workpiece.
Can be formed into

In the work gripping mechanism of the third aspect , the inner cylinder is
A steel member is used, and the collet chuck and the tapered core are
An insulating material between at least one of the inner part of the collet chuck and the inner plate made of steel and the supporting plate .
It is configured to prevent current from flowing in the cylinder . Since the insulating material is interposed between at least one of the collet chuck and the tapered cone portion or between the steel inner cylinder and the support plate, the collet chuck and the tapered cone portion are in a non-conductive state.
Therefore, the taper taper from the collet chuck during plating.
Since no current flows through the cone portion , electrolytic corrosion is prevented from occurring in the collet chuck, and the life of the collet chuck can be extended. Thus, no current flows through a steel inner tube from the collet chuck at the time of plating process, the workpiece → collet chucking click route can be efficiently energization, it is increased production efficiency. Further, by using the steel inner cylinder, the inner cylinder can be easily processed, the cost can be reduced, and a desired strength can be obtained.

According to a fourth aspect of the work gripping mechanism, the inner cylinder
Use a non-conductive member to charge the inner cylinder from the collet chuck.
It was constructed to prevent the flow of water . Since using the non-conductive inner tube, no current flows through the inner tube from the collet chuck at the time of plating. Therefore, it is possible to prevent the electrolytic corrosion from occurring in the collet chuck and prolong the life of the collet chuck. Further, it is possible to efficiently energizing the work → collet chucking click route when the plating process, is increased production efficiency. Further, by using the inner tube of non-conductive, as in claim 2, must be interposed in at least one of or between the inner cylinder and the support plate of the collet chuck and the tapered cone portion of the insulating material There is no.

The workpiece holding mechanism according to claim 5, wherein the mounting Rukoto vertically movably in the inner cylinder nonconductive outer tube,
The liquid level around the rod-shaped work has been changed.
It is configured to be adjusted according to the peak . Since the liquid level around the work can be adjusted by moving the outer cylinder up and down, for example, when the work is changed, a suitable liquid level can be obtained according to the work.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a cylinder unit including a rod-shaped work according to the present invention.

FIG. 2 is a piston rod diagram as a rod-shaped work according to the present invention.

FIG. 3 is a sectional view of an electroplating apparatus according to the present invention.

FIG. 4 is a sectional view of a masking jig according to the present invention.

FIG. 5 is a sectional view of another embodiment of the masking jig according to the present invention.

FIG. 6 is a cross-sectional view of a work gripping mechanism (first embodiment) according to the present invention.

FIG. 7 is an operation explanatory view of the collet chuck according to the present invention.

FIG. 8 is an operation diagram of the electroplating apparatus according to the present invention.

FIG. 9 is an operation explanatory view of the work gripping mechanism (first embodiment) according to the present invention.

FIG. 10 is a work gripping mechanism according to the present invention (second embodiment).
Cross section of

FIG. 11 is an operation explanatory view of the second embodiment according to the present invention.

FIG. 12 is a work holding mechanism according to the present invention (third embodiment).
Cross section of

FIG. 13 is an operation explanatory view of the third embodiment according to the present invention.

FIG. 14 is a work holding mechanism according to the present invention (first embodiment).
Comparison diagram of the current and the workpiece gripping mechanism (third embodiment)

FIG. 15 is a principle diagram of a conventional work gripping mechanism.

16 is an operation diagram of FIG.

[Explanation of symbols]

5, 105 ... Rod-shaped work (piston rod), 10 ... Electroplating device, 23 ... Lift support plate (support plate), 60, 9
0 ... Work gripping mechanism, 61, 97 ... Non-conductive outer cylinder (resin outer cylinder), 61a ... Opening, 61b ... Through hole, 62, 92 ...
Inner cylinder, 63, 93 ... Cone portion, 64, 95 ... Conductive gripping member (collet chuck), 65, 96 ... Chuck holding member, 66 ... Copper rod, 67, 103 ... Spring, 6
8, 104 ... Resin guide, 71, 109 ... Insulation ring,
83 ... Plating liquid, 85 ... Bubbles.

Claims (5)

(57) [Claims] 1. A steel core for gripping an upper end of a rod-shaped workpiece
And Ttochakku, surrounds the collet chuck has an opening only at the lower end, further comprising a non-conductive outer cylinder is extended to lower the lower end of the opening collet chuck main
In the work gripping mechanism of the kick device , the inner cylinder is built in the outer cylinder, and the inner cylinder is suspended and supported by the support plate.
Hold and form a tapered cone part at the bottom of the inner cylinder.
Inside the tapered cone part, the collet chuck is installed.
A spring for urging the collet chuck downward
Equipped with the collet chuck against the spring force of this spring
At the upper end of the rod-shaped work,
Spread the torch chuck up from the tapered cone.
And grip the rod-shaped work with the expanded collet chuck.
A work gripping mechanism for a plating device, which is configured as described above . Wherein one or more holes drilled in the outer cylinder above the previous SL openings at below the lower end of the collet chuck <br/>
The workpiece holding mechanism of the plating apparatus according to claim 1, further comprising: Wherein the inner tube and the steel member, before and during, or the inner cylinder of the collet chuck and the tapered cone section
Serial interposed on at least one insulating material between the support plates, the current flows into the inner cylinder from the collet chuck
It is constituted so as to prevent
The workpiece gripping mechanism of the plating apparatus according to claim 2 . 4. The inner cylinder is made of a non-conductive member, and the core
To prevent current from flowing from the chuck to the inner cylinder
The work holding mechanism of the plating apparatus according to claim 1 or 2 , wherein the work holding mechanism is configured. The method according to claim 5, wherein said vertically movable mounting Rukoto the outer tube to the inner tube of non-conductive, the periphery of the liquid level of the bar workpiece, the rod-shaped rings changed
The work gripping mechanism of the plating apparatus according to any one of claims 1 to 4, wherein the work gripping mechanism is configured to be adjusted according to the peak.