JPS6046196B2 - High speed plating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for a so-called high-speed plating method, which performs chromium plating or other electroplating on an object to be plated in a flowing plating solution.

Generally, in the high-speed plating method, the object to be plated is placed in a sealed container, and electrolyte is supplied while plating is applied. It had a problem that made it difficult to seal. That is, the closed container has to be opened and closed frequently in order to accommodate and take out the objects to be plated, and at that time, the plating solution inside leaks to the outside. This invention eliminates this problem and will be described below with reference to the illustrated embodiments.

FIG. 1 shows a cross-sectional view of a high-speed plating apparatus. In the figure, 1 is a machine frame installed on the floor, and has a closed container 2 on one side in which the plating process is performed. 3 is power supply, power supply that can be cut out freely,
4 indicates a tank for plating solution.

Bar-shaped guides 5, 5 are fixed to the machine frame 1, and the bar-shaped guides 5
A sliding body 6 is supported.

A first hydraulic cylinder 7 is screwed onto the machine frame 1 and has a piston 7a inside.

The piston 7a is connected to a piston Ba of a second hydraulic cylinder 8 which is screwed onto the sliding body 6 via a rod 7b. The closed container 2 has a substantially cylindrical shape and is supported by the base frame 1 with its axis parallel to the floor, that is, in the horizontal direction.

Further, the sealed container 2 is constructed by sandwiching both ends of a metal cylinder 9 serving as an anode between lid members 12, 12 made of an insulating material, and integrally joined with bolts 13 and nuts 10, and a plating chamber M is formed inside. There is. The metal tube 9 is made of copper, and a thin platinum film is electrodeposited on the inner surface and end surface. Reference numeral 14 connects the metal tube 9 to the positive terminal of the power source 3 through an electric wire 11 using a connector fixed around the metal tube 9 .

The lid member 12 has an insulating material or its surface J is covered with an insulating material, and supports the metal tube 9 with respect to the machine frame 1 in an electrically insulating manner. The two opposing lid members 12, 12 have through holes 15, 15.
is bored, and plug members 16a and 16b are slidably supported in the through hole 15. The plug member 16a is attached to the sliding body 6 with a nut N, and the plug member 16b is supported by the lid member 12, and as shown in FIG. The springs 18, 18 are always biased toward the other plug member 16a, and the springs 18, 1
The plug member 8 moves to the right in the figure and presses the object W to be plated against the other plug member 16a to clamp it. The plating chamber M is connected to a pump 21 via a switching valve 19 on one side of the metal cylinder 9, and into the tank 4 through a return vibe 22 on the other side. 23 is an electric motor for driving the pump 21. The switching valve 19 switches the plating liquid pumped from the pump between the inside of the closed container 2 and the inside of the tank 4. An air guide 24 is attached to the outside of the lid member 12 by a circlip 25, as shown in FIG.

An annular groove is formed on the inner surface of the air guide 24, and a conical protrusion 27 is formed around the center hole 26. 2
8 is a supply port for pressurized air.

When pressurized air is supplied to the inner surface of the air guide 24, an air current is blown in the form of an air curtain along the conical protrusion 27 and around the entire outer surface of the plug member 16b, thereby removing the plating liquid attached to the surface of the plug member 16b. is blown into the annular air chamber 29 formed in the lid member 12, and flows through the duct 31 into the tank 4.
It flows back into the body. The inside of the air chamber 29 is kept at a higher pressure than the plating chamber M by pressurized air to prevent the plating solution from leaking to the outside through the through holes 15. Note that the air guide 24 is also attached to the other lid member, and causes the plating solution adhering to the plug member 16a and the outer surface of the object W to be plated to similarly flow back into the tank 4 via the duct 32. 33 is a hydraulic power source for driving the hydraulic cylinders 7 and 8, which includes a tank 3 and a pump 3;
Consists of 5.

36 and 37 are oil passage switching valves, and each boat A, B, C, and D have oil passage switching valves. Boats A, b, c, d with hydraulic cylinders 7 and 8, respectively
is familiar with

An electric wire 38 connects the negative terminal of the power source 3 to the object W to be plated through the machine frame 1.

Next, the operation of this embodiment will be explained.

Figure 4! As shown in the figure, when the object W to be plated is interposed between the plug members 16a and 16b and the oil passage switching valve 37 is operated to supply pressure oil to the c boat of the second hydraulic cylinder 8, the piston 8a moves the rod 7b. Since it is kept stationary by the first hydraulic cylinder 7, the sliding body 6 moves to the left in the figure and clamps the object W to be plated between the plug members 16a and 16b. Next, the oil passage switching valve 36 is operated to supply pressure oil to the boat b. The piston 7a moves to the left in the figure, and the rod 7b
moves the piston 8a of the second hydraulic cylinder 8 to the left, but since the piston 8a is kept immobile by the pressure oil supplied to the boat c, the second hydraulic cylinder 8 and the sliding body 6 are moved as a whole. move to the left. At this time, the plug member 1
6b is pressed by another plug member 16a via the object W to be plated, and moves backward while stretching the springs 18, 18, so that the object W to be plated changes from the state shown in FIG. 3 to the state shown in FIG. It is housed in a closed container 2. a Next, when the switching valve 19 is switched to the position indicated by the two-dot chain line in FIG. At the same time, the water is sequentially refluxed into the tank 4 through the return duct 22.

In this state, power supply starts from the power supply 3, and the metal tube 9 serving as the anode
Electricity is applied between the cathode and the object to be plated, and electroplating is performed.

This example is for chromium plating, and the plating solution has a so-called sergeant bath composition containing dichromic acid as a main component, and the flow rate on the outer surface of the object W to be plated is approximately 2.5 Tn. /S
It was set as ec. The current density was 15 A/d, the object to be plated was a piston rod for a hydraulic shock absorber of a vehicle, and it took about 5 cycles to obtain a 50 μm plating layer. When plating is completed, the power supply is cut off and the switching valve 19 is returned to the position indicated by the solid line in FIG. 1, so that the plating solution in the closed container 2 returns to the tank 2 through the duct 22.

Next, the object W to be plated is taken out to the outside in the reverse order in which it was placed into the closed container 2. In this case, when the object W to be plated passes through the lid member 12 on the right side in the figure, the air guide 2
The plating liquid adhering to the outer surface of the object W to be plated is successively blown toward the left in the figure by the pressurized air that is forced into the airtight container from 4, and the surface is squeezed by the air flow. It is removed from the outer surface of the object W to be plated, and the air chamber 2
9, is collected into the tank 4 through the duct 31. As described above, this invention has a plating chamber M in which a plating solution circulates inside.
A lid member 1 that supports a cylindrical airtight container 2 with its axis directed in a substantially horizontal direction and closes openings at both ends of the airtight container.
2 is provided with a through hole 15 that communicates between the inside and outside, and a plug member 16 that fits into and closes the through hole. Since the sealing surface between the plug member 16 and the plug member 16 is small, the sealing therebetween can be easily performed.

Further, since the object to be plated is supported by the plug member and accommodated in the plating chamber, the object to be plated can be accommodated in the plating chamber M.
The internal support structure is simple, and it is easy to accommodate and take out small objects W to be plated into the plating chamber. Furthermore, since the liquid supply pump 21 that supplies the plating liquid to one side of the bottom of the sealed container is connected to the return vibe 22 on the other side, the plating liquid can simply be circulated into the plating chamber M. In addition, the plating solution in the plating chamber M can be quickly removed or quickly filled, so that the plating solution does not leak out from the through hole 15 when the object W to be plated is taken out or put in. , it is possible to reduce the amount of particles attached to the object W to be plated and carried out. Therefore, as a device for high-speed plating of a large number of small parts, remarkable effects not seen in conventional devices can be obtained.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the invention. Figure 1 is a cross-sectional view of the high-speed plating equipment, and Figure 2 is its ■-■
FIG. FIGS. 3 and 4 are partial sectional views showing the operating sequence. FIG. 5 is an enlarged sectional view of the main part. 1...
... Machine frame, 2 ... Airtight container, 3 ... Power supply, 4 ... Plating solution tank, 9 ... Metal tube, 12 ... Lid member, 15...Through hole, 16
a, 16b...Plug member, 19...Switching valve.

Claims (1)

[Claims] 1. A lid member 12 that supports a cylindrical sealed container 2 with its axis oriented in a substantially horizontal direction, and closes openings at both ends of the sealed container. is provided with a through hole 15 that communicates between the inside and outside and a plug member that fits into the through hole and closes it, and the object to be plated is supported by the plug member and accommodated in the plating chamber; A liquid supply pump 21 that supplies plating liquid to one side of the bottom of the closed container,
This is a high-speed plating device in which the return pipe 22 is connected to the other side. 2. A high-speed plating apparatus as set forth in item 1, wherein the lid member is made of an electrically insulating material.