JP6403612B2 - Power supply device for rod plating equipment - Google Patents

Description

  The present invention relates to a power feeding device for a rod plating apparatus for plating an outer peripheral surface of a columnar or cylindrical workpiece such as a piston rod of a hydraulic cylinder or an air cylinder.

  Rods such as piston rods of hydraulic cylinders and air cylinders are hard chrome plated to provide wear resistance. Since the piston rod slides in the cylinder, this plating is required to have a uniform thickness in the length direction and the circumferential direction, and more uniform quality is required. It has been. Since the thickness of the plating depends on the positional relationship between the workpiece and the anode and the current density, the uniformity in the length direction is ensured by optimizing the arrangement of the anode. In order to ensure the uniformity in the circumferential direction, plating is generally performed while rotating the workpiece. For this reason, a power supply device that supplies power to the rotating workpiece is required, and for example, a power supply device as shown in Patent Document 1 has been proposed.

  What is shown in this Patent Document 1 is an article support device for electroplating provided with a mechanism for feeding power while giving rotation to the rod, and the rod as the work is made by using a jig on the feeding flange provided on the feeding shaft. The current is supplied from a carbon power supply brush that is supported and contacts a power supply drum provided on the power supply shaft. However, since the carbon power supply brush has a high specific resistance, it has a problem that it easily overheats at a large current, and deteriorates due to cracking or scraping if continued to be used in an overheated state. Furthermore, when the workpiece becomes large, it is necessary to increase the plating area and supply a large plating current, and it is necessary to increase the contact area between the power supply drum and the power supply brush. For this reason, carbon brushes are processed according to the curved surface of the power supply drum, but because the power supply drum rotates due to contact with the curved surface, the contact area is reduced and further overheating and deterioration occur. There was a problem that it had to be constantly inspected and maintained.

JP-A-5-156500

  An object of this invention is to provide the electric power feeder of a rod plating apparatus which can supply electric power stably over a long period of time even with a large current.

In order to achieve the above object, the present invention is a power supply device for a rod plating apparatus for plating the outer peripheral surface of a columnar or cylindrical workpiece, and the workpiece is attached to the tip so that the central axis is on the same line. A disk-shaped rotating electrode is attached to the drive shaft to be rotated, and a feeding electrode having a flat contact surface is brought into contact with and pressed against the end surface of the rotating electrode. In this case, the feeding electrode can be pressed against both end faces of the rotating electrode, and the same number of feeding electrodes can be pressed against both end faces of the rotating electrode .

  The operation of the above problem solving means is as follows. That is, current flows from the disk-shaped rotating electrode to the feeding electrode that is pressed against the end face of the rotating electrode. Since both the contact surface of the feeding electrode and the rotating electrode are flat, they are in contact with each other, and even if the rotating electrode rotates, stable contact can be maintained without causing abnormal wear, and the contact area also changes when worn. Never do. Thereby, stable power supply is possible over a long period of time.

  As described above, according to the power feeding device of the rod plating apparatus of the present invention, the current flows from the rotating electrode to the power feeding electrode, but since the power feeding electrode and the rotating electrode are in contact with each other, the rotating electrode rotates. Even if it wears, however, there is no abnormal wear, and stable contact can be maintained. Even when worn, there is an advantage that the contact area does not change. In addition, when the feeding electrode is pressed against both end faces of the rotating electrode, a large number of feeding electrodes can be brought into contact with the rotating electrode of the same size, so that a large current can be fed. There is an advantage to become. Here, when the same number of feeding electrodes are brought into contact with and pressed against both end faces of the rotating electrode, the force that pushes the rotating electrode in the axial direction is canceled out, and the axial force is not applied to the bearing There is. Further, when the conductive plate is provided, since the conductive plate is made of a soft material, there is an advantage that contact with the rotating electrode is further stabilized and wear of the rotating electrode is reduced.

It is a top view of the principal part which shows the structure of the electric power feeder of the rod plating apparatus of this invention. It is a longitudinal cross-sectional view in the AA part of FIG. It is a longitudinal cross-sectional view in the BB part of FIG. It is a top view which shows the structure of the whole rod plating apparatus. It is a fragmentary longitudinal cross-section which shows the structure of the whole rod plating apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In the figure, reference numeral 1 denotes a drive shaft for attaching a workpiece to the tip for rotation, and the drive shaft 1 is provided with a disk-like rotary electrode 3 via a boss 2. Feeding electrodes 4, 4 are in contact with the end face of the rotating electrode 3, and the feeding electrodes 4, 4 are respectively attached to feeding electrode mounting plates 5, 5. The rotating electrode 3 is preferably made of a material having high conductivity and high hardness such as chrome copper in order to reduce wear, and the feeding electrodes 4 and 4 and the feeding electrode mounting plates 5 and 5 are made of, for example, copper. It is preferable to use a material having good conductivity. Here, the feeding electrodes 4 and 4 can be brought into contact with not only one end face of the rotating electrode 3 but also both end faces, and this is the invention of claim 2 or 3.

  In addition, the conductive plates 6 and 6 can be attached to the surfaces of the power supply electrodes 4 and 4 in contact with the rotating electrode 3, and the conductive plates 6 and 6 are attached. In this case, the conductive plates 6 and 6 come into contact with the rotating electrode 3, but the conductive plates 6 and 6 are made of a soft material having good conductivity such as silver in order to reduce wear of the rotating electrode 3. It is preferable to do. The feed electrode mounting plates 5 and 5 are supported by guides 9 and 9 attached to the support plates 8 and 8 fixed to the substrate 7 so as to be movable in a direction perpendicular to the end face of the rotating electrode 3. The springs 10, 10 are attached between the plates 5, 5 and the support plates 8, 8, and the feeding electrodes 4, 4 are pressed against the rotating electrode 3 by the elastic force of the springs 10, 10. 11 and 11 are flexible conductors such as a laminated copper foil for connecting the feeding electrode mounting plates 5 and 5 and a bus bar 12 connected to a DC power supply device (not shown).

  FIG. 4 is a plan view showing the configuration of a rod plating apparatus incorporating the power feeding device of the rod plating apparatus of the present invention, FIG. 5 is a partial longitudinal sectional view, and 13 is a rectangular plating tank long in one direction, The plating tank 13 is provided with a partition at one end in the longitudinal direction by a partition plate 14, and this partition is used as a work mounting chamber 15. The drive shaft 1 is supported on both sides of the rotary electrode 3 by bearings 16 and 16 outside the work mounting chamber 15. One end of the drive shaft 1 extends into the work mounting chamber 15 and a work mounting frame 17 is provided at the tip. It is attached. The partition plate 14 is provided at a position where the work mounting frame 17 can be sufficiently accommodated in the work mounting chamber 15, and the partition plate 14 can be divided so that the work W can pass through the partition plate 14. In addition, a sealing material is attached to a part of the partition plate 14 through which the workpiece W passes and a part in contact with the plating tank 13.

  An anode bar 18 for suspending an anode electrode (not shown) is provided on the upper part of the plating tank 13, and a set of two supporting rollers 19, 19 for supporting the workpiece W on the bottom surface of the end far from the workpiece mounting chamber 15. There are multiple sets. The workpiece W is attached to the workpiece attachment frame 17 using a jig 20 at the front end, and supported at the rear end by support rollers 19 and 19. A pulley 21 is attached to the tip of the drive shaft 1 on the side not inserted into the workpiece mounting chamber 15, and a belt 24 is stretched between the pulley 23 attached to the output shaft of the motor 22 and the pulley 21.

  In the rod plating apparatus incorporating the power feeding device of the rod plating apparatus of the present invention configured as described above, the anode electrode is suspended from the anode bar 18, and the positive electrode of the DC power supply device (not shown) and the anode bar 18 are connected, The negative pole of the DC power supply device and the bus bar 12 are connected. The workpiece W that has been pretreated is lowered into the plating tank 13, and the tip of the workpiece W is attached to the workpiece attachment frame 17. At this time, the workpiece W is attached using the jig 20, and the jig 20 is configured for each type of the workpiece W so that the central axis of the workpiece W and the central axis of the drive shaft 1 are on the same line. It is. Since the rear end of the workpiece W is supported by one of the plurality of bearing rollers 19 and 19 depending on the type of the workpiece W, the roller which supports the central axis of the workpiece W and the central axis of the drive shaft 1 on the same line. 19 and 19 are adjusted in height and interval.

  At this time or after this, a partition plate 14 is attached to partition the work mounting chamber 15. Depending on the configuration, the partition plate 14 is attached to the lower half before the work W is lowered, and the other half is attached after the work W is attached, or is attached to the work W and lowered together with the work W. When the plating bath 13 is filled with the plating solution and the motor 22 is rotated, the rotation of the motor 22 is transmitted to the drive shaft 1 through the pulley 23, the belt 24, and the pulley 21, and the rotating electrode 3, the workpiece mounting frame 17, and the workpiece mounting frame 17. The workpiece W attached to is rotated by the drive shaft 1. Since the plating solution filled in the plating tank 13 is partitioned by the partition plate 14, it hardly enters the workpiece mounting chamber 15, but the plating solution leaked into the workpiece mounting chamber 15 is collected.

  When the DC power supply device is operated here, the current flows from the positive pole of the DC power supply device to the anode bar 18, anode electrode, work W, jig 20 and work mounting frame 17, drive shaft 1, rotating electrode 3, feeding electrodes 4, 4. Then, it flows through the path of the feeding electrode mounting plates 5 and 5, the flexible conductors 11 and 11, and the bus bar 12 to the negative electrode of the DC power supply device, and the workpiece W is plated. At this time, the feeding electrodes 4 and 4 are pressed against the rotating electrode 3 by the spring 10, and the rotating electrode 3 rotates while being in contact with the feeding electrodes 4 and 4. However, since they are flat, stable contact can be maintained. . When the workpiece W is plated for a predetermined time, the DC power supply device and the motor 22 are stopped, and the plating solution is discharged from the plating tank 13. Thereafter, when the workpiece W is pulled up from the plating tank 13 in the reverse procedure, the plating of one workpiece W is completed.

  As described above, according to the power feeding device of the rod plating apparatus of the present invention, the current flows from the rotating electrode 3 to the power feeding electrodes 4 and 4, but the rotating electrode 3 rotates because of the contact between the planes. In this case, there is an advantage that abnormal wear does not occur, stable contact can be maintained, and the contact area does not change even when worn. In the illustrated example, the two feeding electrodes 4 and 4 are in contact with both end faces of the rotating electrode 3 respectively. However, the feeding electrodes 4 and 4 may be in contact with only one end face. A different number of feeding electrodes may be brought into contact with each other.

  Since the number of power supply electrodes 4 and 4 is determined according to the supplied current, when contacting both end faces, it is assumed that they are divided into two sets and are in contact with both end faces of the rotating electrode 3 respectively. be able to. In the case where the feeding electrodes are in contact with both end faces, a larger number of feeding electrodes can be brought into contact with the rotating electrode of the same size, so that there is an advantage that a large current can be fed. If the number of the feeding electrodes 4 and 4 is an even number, the half of the feeding electrodes 4 and 4 can be brought into contact with both end surfaces of the rotating electrode 3 by dividing into two equal parts. The axial pushing force is canceled out, and there is an advantage that no axial force is applied to the bearings 16 and 16. Further, when the conductive plates 6 and 6 are provided, the conductive plates 6 and 6 are made of a soft material, so that the contact with the rotating electrode 3 is further stabilized, and the wear of the rotating electrode 3 is reduced. .

  In the above-described embodiment, the feeding electrodes 4 and 4 are pressed against the rotating electrode 3 by the elastic force of the spring 10, but it is also possible to press the feeding electrodes 4 and 4 with an air cylinder. It is also possible to combine a hydraulic cylinder or an electric actuator in addition to the spring 10. When the means for pressing the power supply electrodes 4 and 4 is an air cylinder, or when a hydraulic cylinder or an electric actuator is combined with the spring 10, the power supply electrode 4 and the power supply electrode mounting plate 5 can be largely separated from the rotary electrode 3. There is an advantage that maintenance is easy. In addition, although this invention is used as the electric power feeder of a rod plating apparatus, it cannot be overemphasized that it can be used also for other electrolytic processing apparatuses, such as an etching and electrolytic degreasing.

DESCRIPTION OF SYMBOLS 1 Drive shaft 2 Boss 3 Rotating electrode 4 Feed electrode 5 Feed electrode mounting plate 6 Conductive plate 7 Substrate 8 Support plate 9 Guide 10 Spring 11 Flexible conductor 12 Bus bar 13 Plating tank 14 Partition plate 15 Work mounting chamber 16 Bearing 17 Work mounting Frame 18 Anode bar 19 Bearing roller 20 Jig 21 Pulley 22 Motor 23 Pulley 24 Belt W Workpiece

Claims (3)

It is a power supply device for a rod plating device that plating on the outer peripheral surface of a cylindrical or cylindrical workpiece, and a disc-shaped rotating electrode is attached to the drive shaft that rotates the workpiece by attaching the workpiece so that the central axis is on the same line. A power feeding device for a rod plating apparatus, wherein a power feeding electrode having a flat contact surface is brought into contact with and pressed against an end face of the rotating electrode.   The power feeding device of the rod plating apparatus according to claim 1, wherein the power feeding electrode is brought into contact with and pressed against both end faces of the rotating electrode.   3. The power feeding device for a rod plating apparatus according to claim 1, wherein the same number of power feeding electrodes are brought into contact with and pressed against both end faces of the rotating electrode.

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