JP4884111B2 - Swing type plating equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oscillation type plating device where, even if screwing has been applied to each cylindrical work, bubbles stuck to its surface and the valley part of the screw can be removed, and the inside face of the cylindrical work can be plated without causing a plating defect. <P>SOLUTION: In the plating device, a fixture 23 fixed with each cylindrical work W and an anode A arranged at the inside thereof is fitted to a hanger 1, and this is charged inside a plating tank 32, and is plated, the hanger 1 is provided with an oscillation mechanism of oscillating the fixture 23 into a pendulum shape at the inside of the plating tank 32, and the inside face of the cylindrical work is allowed to be plated without causing a plating defect. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to an oscillating plating apparatus, and more particularly to an oscillating plating apparatus suitable for plating an inner surface of a cylindrical workpiece.

  Conventionally, when plating on the inner surface of a cylindrical workpiece, it has been common to place an anode inside the workpiece and stir the plating solution in air. However, in recent years, an increasing number of workpieces are required to be threaded on the inner surface, such as a threaded joint for pipes, and to be plated evenly to the thread valley. In the case of such a workpiece, bubbles generated by pretreatment such as acid treatment or electrolytic degreasing may adhere to the workpiece surface and be brought into the plating tank as it is, and bubbles generated during plating may adhere to the screw valleys. Sometimes. In the conventional plating method performed with air agitation, these bubbles cannot be removed completely, and there is a problem in that plating does not adhere at the portion where the bubbles are attached, resulting in defective plating called non-plating.

In order to remove bubbles and obtain uniform plating, it is effective to swing the workpiece. Generally, the workpiece suspended on the hanger is swung horizontally or vertically. A swinging device such as that disclosed in Patent Document 1 that can change the swinging direction has been proposed, but all swings the workpiece linearly. Therefore, for cylindrical workpieces with internal threads, the plating solution inside the workpiece does not move much when the swinging direction is perpendicular to the workpiece axis, and the plating solution is used when the workpiece is in the axial direction. In this case, since it is not possible to remove the bubbles adhering to the valley of the screw by directly flowing on the screw thread, the plating failure cannot be eliminated even by rocking.
JP 7-11499 A

  The present invention solves the above-mentioned problems, and even if threading is performed, bubbles adhering to the inner surface of the cylindrical workpiece during pretreatment and bubbles generated during plating and adhering to the valley of the screw can be removed. The present invention has been made to provide a swing type plating apparatus capable of accurately plating a cylindrical workpiece without causing defective plating.

The oscillating plating apparatus of the present invention, which has been made to solve the above problems, is equipped with a jig that fixes a cylindrical workpiece and an anode disposed in the hanger and puts it in the plating tank. In a plating machine for plating, a jig that fixes the workpiece together with the anode is attached to the jig mounting frame of the hanger, and the mounting frame is swung in a pendulum shape around the horizontal rocking shaft above it in the plating tank. A swing mechanism is provided on the hanger, and the drive source of the swing mechanism is to rapidly accelerate the drive shaft of the swing mechanism by a pair of left and right drive claws provided with a gap to apply an impact to the workpiece W. It is characterized by this. It is preferable to provide a drive source for the swing mechanism provided on the hanger outside the plating tank, and to provide a transmission mechanism for transmitting power from the drive source to the swing mechanism when the hanger is put into the plating tank.

According to the present invention, the cylindrical workpiece is fixed to the jig together with the anode disposed therein, and is attached to the jig attachment frame of the hanger. because of bombarding the workpiece W with swings like a pendulum as the axis of the horizontal pivot shaft, differently from the case where is simply linear motion workpiece in the axial direction, the plating solution to the workpiece inner surface being threaded Since it flows between the workpiece and the anode while colliding, air bubbles generated in the pretreatment and adhering to the workpiece and bubbles adhering to the screw valleys during plating are completely removed, resulting in poor plating. There is an advantage that does not occur. Further, when a drive source for the swing mechanism is provided outside the plating tank and a transmission mechanism for transmitting power from the drive source to the swing mechanism when the hanger is put into the plating tank, a plurality of plating tanks are provided. There is an advantage that all the workpieces attached to the hanger put in the pretreatment tank, the posttreatment tank, etc. can be swung by one drive source.

Next, the best mode for carrying out the present invention will be specifically described with reference to the drawings.
1 and 2 show a swing-type plating apparatus of the present invention in which a jig with a workpiece and an anode fixed is attached to a hanger and placed in a plating tank, and the workpiece is plated. FIGS. 3 to 5 show the hanger. It shows the details, the configuration of some jigs and the mounting state of the workpiece.
The hanger 1 is provided with hooks 3 and 3 that are supported at both ends of the upper surface of the hanger body 2 and supported by the carrier, and support plates 4 and 4 are provided at both ends of the lower surface of the hanger body 2. A jig mounting frame 5 is swingably provided at the lower end of the hanger 1, and the jig mounting frame 5 is supported on the support plates 4 and 4 by a swing shaft 6.

  A drive shaft 7 is rotatably provided above the support plates 4 and 4, and gears 8 and 8 fixed to the drive shaft 7 are engaged with gears 9 and 9 fixed to the swing shaft 6. The swing mechanism is formed by the jig mounting frame 5, the swing shaft 6, the drive shaft 7, and the gears 8, 8 and 9, 9. The gears 8, 8 and 9, 9 are not disk-shaped having teeth on the entire circumference, but can be formed by deforming only the portion that meshes and rotates.

  One end of the drive shaft 7 protrudes laterally from the support plate 4, and a lever 11 having a roller 10 is attached to the tip of the drive shaft 7. Feeding bars 12 and 13 are provided on both front and rear sides of the hanger body 2 in parallel with the hanger body 2, and wedge-shaped power receiving terminals 14 and 15 are provided on the lower surface of one end of the feeding bars 12 and 13, respectively. It is provided. In the figure, 16, 16, 17, and 17 indicate insulators between the power supply bars 12 and 13 and the hanger body 2. It is preferable that the power receiving terminals 14 and 15 are attached after the interval between the power feeding bars 12 and 13 is widened.

  Auxiliary power feeding bars 18 and 19 are insulated and provided integrally with the jig mounting frame 5 between the power feeding bars 12 and 13 and the jig mounting frame 5, and between the power feeding bar 12 and the auxiliary power feeding bar 18 and power feeding. The bar 13 and the auxiliary power supply bar 19 are connected by flexible conductors 20 and 21, respectively. The auxiliary power supply bars 18 and 19 can be integrated with the jig mounting frame 5 in an insulated state by constituting the gears 9 and 9 with an insulating material and fixing them to the gears 9 and 9. Reference numeral 22 denotes a column attached to the lower surface of the hanger body 2 and is provided at the end on the side where the power receiving terminals 14 and 15 do not exist.

  The workpiece W is fixed to the jig 23 together with the anode A, and the jig 23 is attached to the jig mounting frame 5 of the hanger 1. The jig 23 is composed of a jig outer frame 24 formed in a box frame shape with all six surfaces open and a flat frame-shaped work presser 25, and a jig mounting frame is provided at the upper end of the jig outer frame 24. 5 is provided with engaging hooks 26, 26 that engage with the workpiece 5, and workpiece receiving claws 27, 27 that support the lower end surface of the workpiece W, and an anode receiver 28 that supports the lower end surface of the anode A, respectively. The work presser 25 is detachably attached to the jig outer frame 24, and work presser claws 29, 29 are provided. The jig 23 is covered with an insulating material, and only the portions of the work receiving claws 27 and 27 that touch the work W are removed.

  The workpiece W is placed on the workpiece receiving claws 27, 27 of the jig 23 configured in this way, and the workpiece holder 25 is held so that the workpiece W is sandwiched between the workpiece receiving claws 27, 27 and the workpiece holding claws 29, 29. The workpiece W is mounted and fixed, and the anode receiver 28 is supported by the lower end of the cylindrical anode A. The anode A is preferably an insoluble anode such as platinum or iridium oxide. The workpiece W is fixed, the anode A is supported, the engagement rods 26 and 26 are engaged with the jig mounting frame 5, and the jig 23 is attached to the hanger 1. A connecting plate 30 is connected to the upper end of the anode A, and the upper end of the connecting plate 30 is fixed to the auxiliary power supply bar 18 to be mechanically fixed and electrically connected. The jig outer frame 24 and the auxiliary power supply bar 19 are connected by a conducting wire 31.

  The hanger 1 is put into the plating tank 32. On the upper surface of the flange 33 on one side of the plating tank 32, a pair of power receiving bases 34 and 35 are provided on both sides of the center of the tank. A driving rod 36 is provided on the side surface of the plating tank 32 so as to be movable back and forth, and a pair of driving claws 37 and 38 are opposed to the upper surface of the driving rod 36 so as to be located on both sides of the center of the tank. It is provided. The drive rod 36 is supported by a roller 39, and is moved back and forth by a fixed stroke by a drive source such as a hydraulic cylinder 40 or the like. In the figure, 41 is an overflow, which regulates the surface of the plating solution so that the hanger 1 is not immersed and the workpiece W is immersed. Although not shown, an overflow receiver is provided outside the overflow 41.

  The jig 23 to which the workpiece W and the anode A are fixed as described above is attached to the hanger 1, and the hanger 1 is conveyed to the plating tank 32 by a conveying device such as a carrier (not shown). In the hanger 1, the power receiving terminals 14 and 15 are supported on the power receiving bases 34 and 35, respectively, and the support 22 is supported on the flange 42 on the side of the plating tank 32 where the power receiving bases 34 and 35 are not provided. In addition, the roller 10 is positioned in the middle of a pair of drive claws 37 and 38. The roller 10 and the drive claws 37 and 38 form a transmission mechanism that transmits power from the drive source to the swing mechanism of the hanger 1.

  A current is supplied to the work W from the power receiving base 35 through the power receiving terminal 15, the power feeding bar 13, the conductor 21, the auxiliary power feeding bar 19, the conductive wire 31, the jig outer frame 24, and the work receiving claws 27 and 27. A current is supplied to the anode A from the power receiving base 34 through the power receiving terminal 14, the power feeding bar 12, the conductor 20, the auxiliary power feeding bar 18, and the connection plate 30. As a result, the workpiece W is plated.

  If the drive rod 36 is moved back and forth here, the roller 10 is pushed and moved by the drive claw 37 or 38, and the drive shaft 7 rotates in the forward or reverse direction by an angle corresponding to the moving distance of the roller 10. become. When the drive shaft 7 rotates, the gears 8 and 8 rotate, and the gears 9 and 9 meshed with the gears 8 and 8 also rotate, so that the jig mounting frame 5 swings around the swing shaft 6. The jig 23 is attached to the jig mounting frame 5 by engaging the engagement rods 26, 26 at the upper end, and the jig 23 swings in a pendulum shape with the swing shaft 6 as an axis.

  At this time, the auxiliary power supply bars 18 and 19 also swing in a pendulum shape. However, the auxiliary power supply bars 18 and 19 are connected to the power supply bars 12 and 13 by the flexible conductors 20 and 21, respectively. It can swing smoothly in a pendulum shape, and power can be supplied stably. When the jig 23 swings like a pendulum like this, the workpiece W similarly swings like a pendulum. When the workpiece W swings in this way, unlike the case where the workpiece W simply moves linearly in the axial direction, the plating solution flows between the workpiece W and the anode A while colliding with the threaded inner surface. Become. As a result, the attached or generated bubbles are completely removed and no plating failure occurs.

  As shown in FIG. 2, a gap is provided between the drive claw 37 and the drive claw 38 so that a gap is generated between the roller 10 and the drive claw 37 and 38 when the hanger 1 is lowered to the plating tank 32. For example, when the driving rod 36 is moved back and forth, the roller 10 is not continuously moved by the driving claws 37 and 38, and the work W is stopped in a vertical state for the gap. When the driving claw 37 or 38 comes into contact with the roller 10 from the stopped state and the roller 10 is pushed, the driving shaft 7 and the swinging shaft 6 are suddenly accelerated, and an impact is applied to the workpiece W. The bubbles adhering to the formed part are more reliably removed.

  In general, in a plating apparatus, a plurality of plating tanks are often installed, and in order to eliminate plating defects, it is necessary to swing the workpiece in a pendulum manner in all the plating tanks. Further, it is preferable that the workpiece is swung in a pendulum shape in the pretreatment tank and the posttreatment tank. In such a case, the drive rod 36 is extended, and a pair of drive claws 37 and 38 are provided on the drive rod 36 so as to be located on both sides of the center of each plating tank or treatment tank. When the hanger 1 is put into each plating tank or processing tank, the roller 10 of the hanger 1 is positioned between the driving claws 37 and 38, and all the rollers 10 are driven by the back and forth movement of the driving rod 36. The workpiece W attached to 1 can be swung in a pendulum shape.

  In the above-described embodiment, the roller 10 is driven by the drive claws 37 and 38 provided on the drive rod 36, but a chain can be used instead of the drive rod 36. Although the hydraulic cylinder 40 is used as a drive source, the present invention is not limited to this, and an electric motor or the like can also be used as a drive source, and the workpiece W is swung in a pendulum shape through a jig 23 in the plating tank. The swing mechanism is not limited to the mechanism as described above.

  As is clear from the above description, according to the present invention, the cylindrical workpiece oscillates in a pendulum shape in the plating tank, so that the plating solution collides with the inner surface of the threaded workpiece and the workpiece and anode Will flow through. The flow of the plating solution that collides with the inner surface of the workpiece cannot be obtained by swinging by simply linearly moving the conventional workpiece W in the axial direction. There is an advantage that bubbles generated during plating and adhering to the inside of the cylinder, such as a thread valley, are completely removed and plating defects do not occur.

It is a longitudinal cross-sectional view of the rocking-type plating apparatus of this invention. It is a side view of the rocking type plating apparatus of the present invention. It is a side view of the hanger used for the rocking-type plating apparatus of this invention. It is a front view of the hanger used for the rocking-type plating apparatus of this invention. It is a top view of the hanger used for the rocking-type plating apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hanger 2 Hanger body 3 Hook 4 Support plate 5 Jig mounting frame 6 Oscillating shaft 7 Drive shaft 8, 9 Gear 10 Roller 11 Lever 12, 13 Feed bar 14, 15 Power receiving terminal 16, 17 Insulator 18, 19 Auxiliary power feeding Bars 20 and 21 Conductors 22 Supports 23 Jigs 24 Jig outer frames 25 Workpiece holders 26 Engagement rods 27 Workpiece receiving claws 28 Anode holders 29 Workpiece holding claws 30 Connection plates 31 Conductors 32 Plating tanks 33 Flange 34, 35 Power supply stand 36 Drive rod 37, 38 Drive claw 39 Roller 40 Hydraulic cylinder 41 Overflow 42 Flange A Anode W Workpiece

Claims (1)

In a plating machine in which a jig that fixes a cylindrical workpiece and an anode placed inside it is attached to a hanger and placed in a plating tank for plating, the jig that fixes the workpiece together with the anode is attached to the hanger. attached to the tool mounting frame, provided with a swinging mechanism for swinging the mounting frame like a pendulum horizontal swinging axis of the upper as the axis to the hanger in the plating bath, the driving source of the swing mechanism, opened a gap An oscillating plating apparatus characterized in that the drive shaft of the oscillating mechanism is suddenly accelerated by a pair of left and right driving claws provided to apply an impact to the workpiece W.

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