JPH0259238B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plating processing device for plating a cylindrical workpiece (object to be processed) such as a pipe, and particularly to a processing device suitable for plating the inner surface or end surface of a workpiece. .

First, an example of a workpiece targeted by the processing apparatus of the present invention will be explained with reference to FIG. The first diagram is a cross-sectional diagram.
In the figure, the pipe P that is the workpiece is equipped with a female thread 1 on the inner peripheral surface of the end, and in actual use,
The male thread 2 at the end of another pipe P' is screwed into the female thread 1 to connect both pipes P and P'. The surface of the female thread 1 and the end surface 3 of the pipe P are plated with zinc or the like, and the plated layer acts as a seal to connect both pipes P and P' in a sealed state. has been conventionally done. However, with the conventional plating device, as shown in FIG. 2, which is an enlarged partial view, the jet of plating liquid cannot sufficiently reach the trough 5 and end surface 3 of the screw 1, and the Since the thick plating layer 7 is formed only on the portion 6, a problem arises in that a sufficient sealing function cannot be obtained during actual use.

In order to solve the above-mentioned problem, the present invention is such that a slit-shaped plating liquid jetting nozzle extending in the longitudinal direction of a cylindrical workpiece is arranged inside the workpiece.
The explanation is as follows with reference to the drawings.

Fig. 3 is a side view of the embodiment of the present invention, and Fig. 4 is a side view of the embodiment of the present invention.
The - arrow view in the figure and FIG. 5 are perspective schematic views. Workpiece P (pipe) to be plated in Fig. 3
It is held in a vertical position in a fitting tank (not shown), and a vertical length L is attached to the inner peripheral surface of the lower end of the workpiece P.
A female thread 10 is provided throughout. A vertical plating liquid supply pipe 11 is arranged in the workpiece P so as to be coaxial with the workpiece P. The upper end 12 of the pipe 11 is closed, and the upper end 12 is located slightly above the upper end of the female thread 10. The lower end of the pipe 11 is open, and a passage 13 within the pipe 11 communicates with an internal passage of a lower cylindrical shaft 14. The cylinder shaft 14 is rotatably supported by a frame 15 in a vertical position, and has an upper end fixed to the pipe 11 and a lower end connected to a plating liquid passage 17 via a rotation joint 16. The inlet of the passage 17 is connected to a plating liquid supply pump (not shown), and the plating liquid is supplied from the pump to the passage 13 via the passage 17, the rotary joint 16, and the passage in the cylindrical shaft 14. It's getting old. In addition, the cylinder shaft 14 has a gear 1.
8 is attached, and by rotating the gear 18 with a motor (not shown), the cylindrical shaft 14 and the pipe 11 are rotated. 19
is an outward flange provided at the lower end of the pipe 11,
A gap 21 is provided between the lower end surface 20 of the workpiece P and the flange 19.

As shown in FIG. 4, two nozzles 25 are provided on the outer peripheral surface of the pipe 11. Both nozzles 25 are pipe 1
They are located in a point-symmetrical position with respect to the center O of 1, and are constructed as follows. That is, the inlet 27 of the nozzle passage 26 provided in the nozzle 25 opens to the inner circumferential surface 28 of the pipe 11, and the nozzle passage 26
The inlet side portion 29 extends from the inlet 27 generally in the connecting direction of the inner circumferential surface 28 . The outlet side portion 30 of the passage 26 is bent with respect to the inlet side portion 29, and the injection port 31 of the passage 26 is connected to the vertical end face 32 of the nozzle 25.
It is provided in Injection opening end surface 3 of both nozzles 25
2 are arranged on a common vertical plane containing the center O, for example. In addition, the outlet side portion 30 is inclined so as to approach the outer circumferential surface of the pipe 11 as it goes toward the injection port 31 side, and the precipitate liquid injected from both injection ports 31 forms a vertically long film-like flow as described later. As shown by the arrow F, the plating liquid collides with the surface of the female thread 10 and flows in the same direction (the circumferential direction of the workpiece P), so that an annular flow of the plating liquid is generated within the workpiece P.

Reference numeral 35 denotes the outer circumferential surface of the nozzle 25, which has an arcuate cross section parallel to the outer circumference of the pipe 11. Reference numeral 36 denotes a vertical side surface of the nozzle 25, which extends parallel to the injection port opening end surface 32 and is continuous with the outer circumferential surface portion 37 of the pipe 11 (the portion where the nozzle 25 is not provided).
A plate-shaped anode 39 (anode plate) is attached to each side surface 36 and an outer peripheral surface portion 37 continuous thereto, and an anode wiring is connected to the anode 39, although not shown.

As shown in FIG. 5, the nozzle 25 is provided over substantially the entire length of the pipe 11. The nozzle passage 26 is provided in the form of a slit over almost the entire length of the nozzle 25, and as shown in FIG.
a and 26b are located at approximately the same height as both upper and lower ends of the female thread 10. An anode 39 is also provided over the entire length of the nozzle 25.

Next, the action will be explained. The tamping liquid supplied from the pump to the pipe internal passage 13 through the passage 17 shown in FIG. The pipe 11 is moved in the direction of arrow R by a motor (not shown), for example.
It can be rotated at a speed of 20rpm to 60rpm. In this operation, since the nozzle passage 26 is slit-shaped as described above, the female thread 10 is removed from the passage 26.
A uniform amount of plating solution is sprayed over the entire length of the plate. Furthermore, the plating liquid flows in an annular manner along the surface of the female thread 10, and since the pipe 11 is rotating, the flow velocity of the annular flow is extremely high. Therefore, a large amount of the fresh plating liquid (plating liquid containing a large amount of plating metal ions) immediately after being ejected from the passage 26 reaches the trough 40 (FIG. 6) of the female thread 10, and the fresh plating liquid is applied to the entire surface of the female thread. The licking liquid contacts evenly. As a result, a plating layer 43 having a uniform and sufficient thickness is formed not only on the female threaded portion 41 but also on the valley portions 40 and the inclined portions 42 in a short time. Furthermore, since the plating liquid after being ejected flows downward inside the workpiece P and flows out of the workpiece P through the gap 21 shown in FIG. A plating layer is formed.

As described above, according to the present invention, the plating liquid supply pipe 11 extending along the center line of the workpiece is disposed inside the cylindrical workpiece P, and the plating liquid is spouted in a slit shape extending in the longitudinal direction of the pipe 11 on the outer periphery of the pipe 11. Since the nozzle 25 is provided and a rotation mechanism (gear 18, etc.) that rotates the pipe 11 and the workpiece P relative to each other is provided, even if the inner surface of the workpiece has unevenness such as a female thread, the entire inner surface can be uniformly and sufficiently It is possible to apply thick plating to the surface, and the plating processing time can also be significantly shortened.

Furthermore, in the present invention, the nozzle 25 protrudes radially outward from the outer peripheral surface of the pipe 11, and
The slit-shaped outlet (injection port 31) of the nozzle passage 26 is provided over approximately the entire length of the pipe 11.
is open in a direction generally along the circumferential direction of the pipe. Further, a rotation mechanism is provided to rotate the pipe 11 and the workpiece P relatively, and the rotational direction R of the pipe 11 with respect to the workpiece P is set to the injection port 3.
The direction is set along the direction in which the plating liquid is ejected from No. 1.

With this structure, it is possible to supply a high-speed film of plating liquid at an angle D (Fig. 4) smaller than 90 degrees to the inner surface to be plated (thread surface), thereby allowing fresh plating liquid to be applied to the entire screw surface. In this respect, it is possible to effectively improve the plating quality and shorten the processing time.

In addition, as shown by the two-dot chain line in Fig. 4, the workpiece P
1 has a large diameter, the angle D1 of the plating liquid flow relative to the workpiece will be relatively large, but even in this case, the angle D1 will not substantially exceed 90 degrees, and in the same direction as the rotation direction R. Since the plating liquid collides with the inner surface of the workpiece, an annular flow of the plating liquid is formed as in the case of a small-diameter workpiece, and the above effect can be reliably obtained.

Contrary to the illustrated case, the pipe 11 can be fixed and the workpiece P can be rotated, or both the pipe 11 and the workpiece P can be rotated in opposite directions. The workpiece P and the pipe 11 can also be tilted. One or more nozzles 25 may be provided, and the pipe 11 may be eccentric with respect to the workpiece P.

A workpiece 50 as shown in FIG. 7 can also be processed by the apparatus of the present invention. The work 50 in FIG. 7 is, for example, a rim for a bicycle wheel, and the vertical width W of each work 50 is small, and the inner surface 51 of the work 50 has a curved cross-sectional shape. A plurality of works 50 are stacked vertically and concentrically with gaps 52 in between, and the works 50 as a whole form a cylindrical body. The pipe 11 is arranged at the center of the workpiece 50,
By spouting the plating liquid from the nozzle 25 while rotating the pipe 11, a plating layer of uniform thickness can be formed over the entire curved inner surface in a short time.
Furthermore, since the plating liquid flows out of the workpiece through the gap 52, the plating liquid flows out from the workpiece 50 at the same time as the inner surface 51.
A plating layer of uniform thickness can be formed in a short time.

[Brief explanation of drawings]

Fig. 1 is a schematic cross-sectional view of a workpiece targeted by the present invention, Fig. 2 is an enlarged partial view of Fig. 1, Fig. 3 is a side view of an embodiment of the present invention, and Fig. 4 is viewed from the - arrow in Fig. 3. 5 is a perspective partial view, FIG. 6 is an enlarged cross-sectional partial view of the workpiece, and FIG. 7 is a schematic longitudinal sectional side view of another embodiment. 11...Plating liquid supply pipe, 18...
Gear (rotating mechanism), 25...Plating liquid jet nozzle,
P... Work.

Claims (1)

[Claims] 1. A plating liquid supply pipe is arranged in a cylindrical workpiece and extends along the center line of the workpiece, and a nozzle protruding outward in the radial direction is provided on the outer circumferential surface of the pipe over approximately the entire length of the pipe. A nozzle passage extending from the inner plating liquid passage to the outer surface of the nozzle is provided, and the outlet of the nozzle passage is formed by a slit-shaped opening that opens in a direction generally along the circumferential direction of the pipe and extends over approximately the entire length of the nozzle. , a cylindrical workpiece characterized in that a rotation mechanism for rotating the pipe and the workpiece relative to each other is provided, and the direction of rotation of the pipe with respect to the workpiece is set along the direction in which the plating liquid is jetted from the outlet of the nozzle passage. Plating processing equipment.