JPH0718038B2 - Piston plating method and apparatus - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a plating method and apparatus for plating mainly a ring groove portion of a piston.

[Conventional technology]

As a conventional plating method and device for plating the ring groove portion of a piston, for example, in the plating tank (a) shown in FIG. Lifting metal fitting (c) attached to the end face side
Hang the piston (b) with, and fix the piston (b) with the ring groove (d) in the horizontal direction. Put the anode (e) on the outer periphery of the ring groove (d) and the piston (b) on the piston (b). Each side of the ring groove (d) is plated with a cathode (f) and then the piston (b) is taken out from the plating tank. Was reattached, and the other one side of the ring groove was plated in the plating tank in the same manner as described above.

[Problems to be Solved by the Invention]

In the conventional piston plating method, the ring groove is oriented horizontally, so it was generated in the plating tank.However, hydrogen gas, impurities, suspended matter, etc. stagnated, settled, and adhered to the plated surface in the ring groove. However, it not only significantly impairs the throwing power, but also causes pinholes and peeling of the plating.If the ring groove is oriented in the lateral direction, the upper and lower surfaces of the groove will be plated with a uniform thickness at one time. Since it is impossible to form a layer, after plating one side as described above, it is necessary to take out from the plating tank, reverse the bottom surface and remount it, and perform plating again. Masking (taping) work is required for the non-existing part,
In this case, the manual work in the horizontal direction parallel to the ring groove is apt to be displaced up and down, and the workability is lower than that in the vertical work.

The present invention has been made in view of the above problems of the conventional technique, and an object of the present invention is to deposit hydrogen gas, impurities, suspended matter, etc. generated in the plating tank in the ring groove. As a result, defective products do not occur, and since plating layers of uniform thickness can be formed simultaneously on the upper and lower surfaces of the ring groove, there is no need to reverse and remount the upper and lower surfaces. Further, the present invention is intended to provide a piston plating method and an apparatus therefor, in which the masking work becomes a manual work in the vertical direction and the work efficiency can be expected to be improved.

[Means for Solving the Problems]

In order to achieve the above object, the method and apparatus for plating a piston of the present invention is such that the piston is attached to a cathode hoisting tool so that the ring groove of the piston is in the vertical direction, and the piston is immersed in a plating solution to remove the ring groove portion. For example, a ring-shaped anode is provided on the outside to perform plating. The apparatus of the present invention is provided with a cathode pedestal having a V-shaped vertical section at the upper end position of each of the columns standing vertically outside the plating tank, and is formed in a substantially T-shape on the left and right cathode pedestals. Place the left and right ends of the horizontal rod of the cathode lifting device, fix the piston mounting plate to the vertical rod of the cathode receiving stand, and attach it to the piston mounting plate so that the ring groove is oriented in the vertical direction. A ring-shaped anode is provided on the outside of.

[Action]

Since the ring groove is oriented in the vertical direction as described above, hydrogen gas, suspended matter, and impurities generated in the plating solution do not rise or precipitate along the groove and remain in the ring groove, and When the cathode hoisting tool is hoisted and the piston is installed outside the plating tank, and the horizontal rod of the cathode hoisting tool is placed on the cathode pedestal, the interval from the cathode pedestal to the piston via the horizontal rod and the vertical rod is automatic. It is possible to form a cathode system, and metal ions eluted into the plating solution from the anode can be deposited on the ring groove surface of the piston for plating.

〔Example〕

An embodiment will be described with reference to the drawings. In FIGS. 1 and 2, the cathode receiving bases 1 and 1 have vertical cross sections at the upper ends of columns 3 and 3 provided vertically on the left and right of a plating bath 2. Abbreviation V
The carrier plate, the insulating plate, the cathode plate, and the supporting plate formed in a V shape are stacked and provided. More specifically, the cathode pedestal 1 has a carrier plate 4 having a V-shaped vertical cross-section, which is fixed directly above the column 3 to support the carrier plate 4.
The insulating plates 5 having a V-shaped vertical section are stacked on the upper side of the, the cathode plate 6 having a V-shaped vertical section is stacked on the upper side of the insulating plate 5, and the support plate 7 having a V-shaped vertical section is stacked on the upper side of the cathode plate 6. Stack. The cathode hoisting tool 8 includes a horizontal rod 9 formed in a rod shape having a length capable of being horizontally mounted on the cathode receivers 1 and 1 provided at the left and right positions, and a lower portion of the horizontal rod 9 is placed in the plating solution 10 downwardly. The vertical rod 11 is formed in a length that allows half of it to hang down, and is formed in a substantially T-shape.
A piston mounting plate 14 for mounting an end surface 13 of the piston 12 on the side opposite to the head surface is fixed to the lower half portion of the piston 12 in the vertical direction. The lifting metal fitting 15 is attached in a substantially U-shaped upright shape at a substantially central position of the horizontal rod 9. The anode 16 may be provided in a ring shape around the ring groove 17 of the piston 12, for example.

Further, in the embodiment shown in FIG. 3, two pistons 22 and 22 can be simultaneously attached and plated on the left and right of the lower half of the vertical rod 21.

〔The invention's effect〕

Since the present invention is configured as described above, it has the effects described below.

Since electroplating is performed with the ring groove oriented, hydrogen gas, impurities, suspended matter, etc., which are liable to stay in the ring groove, are eliminated from the conventional defect factors, eliminating pin poles and plating separation, and ensuring good quality. Since a thick plating layer can be formed, there is no need to reverse the upper and lower surfaces of the ring groove to perform plating again, and the time required for mounting and plating is halved. Furthermore, the piston is mounted on the vertical rod and the horizontal rod is the cathode. Since the cathode system is formed only by mounting the receiver first, it is possible to mount the piston and the cathode at the same time,
Furthermore, since the masking manual work can be done in the vertical direction, there is little deviation, and it is expected that the productivity of plating work will be significantly improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a piston plating method and apparatus, and FIG. 2 is a vertical sectional view taken along the line AA of FIG.
FIG. 3 is a partially longitudinally cutaway front view showing a case where two pistons are attached, and FIG. 4 is a front view showing a conventional piston plating method and apparatus. DESCRIPTION OF SYMBOLS 1 ... Cathode pedestal 2 ... Plating tank 3 ... Struts 4 ... Supporting plate 5 ... Insulating plate, 6 ... Cathode plate 7 ... Support plate, 8 ... Cathode lifting tool 9 ... Horizontal rod , 10 …… plating liquid 11, 21 …… vertical rod, 12, 22 …… piston 13 …… end face, 14 …… piston mounting plate 15 …… lifting metal fitting, 16 …… anode 17 …… ring groove

Claims (2)

[Claims] 1. A bottom surface of a V-shaped carrier plate is positioned in a horizontal straight line on the upper end of each of the columns that stand up to the outside of the upper ends of the left and right plating tank walls of the plating tank so that they are parallel to each other. The bottom surface of the cathode pedestal, which is formed by stacking the V-shaped cathode plate in which the cathode is connected to the upper surface side of the carrier plate via the V-shaped insulating plate and the supporting plate in the V-shaped vertical section, is positioned on a horizontal line. At the very least, the pistons are attached to the vertical rods of the cathode hoisting tool, which are provided in parallel to the outer ends of the left and right plating lateral walls in parallel with each other, and are mounted on the cathode pedestal in a substantially T-shape so that the ring groove is in the vertical direction. A method for plating a piston, which is characterized by performing electroplating in a plating tank. 2. A bottom surface of a V-shaped carrier plate is horizontally aligned with the upper end of each of the columns upright to the outside of the upper ends of the left and right plating tank walls of the plating tank. The bottom surface of the cathode pedestal, which is formed by stacking the V-shaped cathode plate in which the cathode is connected to the upper surface side of the carrier plate via the V-shaped insulating plate and the supporting plate in the V-shaped vertical section, is positioned on a horizontal line. Provide at least in parallel to the outer positions of the upper end portions of the left and right plating tank walls, mount a horizontal rod of the cathode lifting tool formed in a substantially T shape on the cathode receiving base, and form a ring groove in the vertical rod of the cathode lifting tool. A piston plating device characterized by mounting the piston in the vertical direction.