JPS6236855Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a workpiece suspension used for electrochemical surface treatments such as anodizing, electrolytic polishing, and electroplating on aluminum products.

A conventional workpiece suspension body includes a conductive suspension body, a pair of aluminum brackets fixed to the suspension body at the upper end and extending downward, and a pair of aluminum brackets that are clamped to the lower end of the brackets. The workpiece is suspended from the copper busbar via a hook fixed to its upper end.

For example, in anodizing an aluminum material, the object to be treated is carried by a crane or the like. After the aluminum material has been pretreated, the suspension body is transported onto the electrolytic cell, and the aluminum material is immersed in the electrolytic solution and subjected to anodizing treatment, and then taken out from the electrolytic cell and washed with water. be done. During this process, electrolyte and cleaning water come into contact with the aluminum bracket, which corrodes the aluminum and generates aluminum oxide on the surface, especially in the area where it contacts the bus bar. In some cases, the conductivity between the copper bracket and the copper busbar was impaired. As a result, it is necessary to periodically disassemble and maintain the suspension, and in poorly maintained suspension bodies, the copper busbars become soft and deformed due to heat generation, resulting in the problem of having to be discarded, resulting in enormous costs. Further, there were problems in that it adversely affected the quality of the object to be treated, required a large amount of electric power for electrolysis, and increased costs.

The object of this invention is to provide a workpiece suspension for electrochemical surface treatment which solves the above-mentioned problems.

In this specification, front and back refer to Figures 2 and 3.
Based on the figure, "front" refers to the left side of the figure, and "back" refers to the opposite side. Furthermore, the term "aluminum" is used to include not only pure aluminum but also aluminum alloys. moreover,
The term "copper" is used to include not only pure copper but also copper alloys.

The workpiece suspension for electrochemical surface treatment according to this invention consists of a conductive suspension body, a pair of front and rear aluminum brackets fixed to the suspension body at the upper end and extending downward, and a bracket. In a workpiece suspension for electrochemical surface treatment consisting of a copper busbar clamped at the lower end, a hole is formed in the clamping surface of the copper busbar in at least one of a pair of brackets. A conductive member having corrosion resistance is fitted into the hole, and a part of the conductive member is in contact with the copper bus bar.

In the above, the hole formed in the clamping surface of the copper busbar in the aluminum bracket may be a bottomed hole or a through hole. Further, this hole may be a female threaded hole. Further, as the conductive member, a material having better corrosion resistance than aluminum, such as copper, titanium, or brass, is used. In addition, the dimensions of the conductive member are
It is determined by the amount of current applied during electrochemical surface treatment.

According to the workpiece suspension for electrochemical surface treatment of this invention, a hole is formed in the clamping surface of the copper busbar in at least one of the pair of aluminum brackets, and the hole is provided with corrosion resistance. Since the conductive member is inserted and a part of it is in contact with the copper busbar, even if aluminum oxide is generated at the contact part of the aluminum bracket with the copper busbar, the aluminum bracket and the copper busbar will not be connected to the conductive member. energized through the Therefore, there is no need to regularly maintain the suspension body, and the copper bus bar does not become soft or deformed, and the quality of the object to be processed is not adversely affected. Further, a large amount of electric power is not required for electrolysis.

An embodiment of this invention will be described below with reference to the drawings based on comparison with a conventional example. The same reference numerals refer to the same parts or parts throughout the drawings.

FIG. 1 and FIG. 2 show a conventional example. In the figure, reference numeral 1 denotes an electrically conductive suspension main body, which is connected to a power source (not shown) by suitable known means, and is adapted to be transported by a crane (not shown). Reference numeral 2 denotes pairs of aluminum brackets fixed to the front and rear sides of the suspension main body 1 at the upper end and extending downward, and a plurality of pairs are arranged at predetermined intervals in the left-right direction. Bracket 2 is
It is fixed to the suspension main body 1 by screwing a nut 4 onto the tip of a bolt 3 that passes through the bracket 2 and the suspension main body 1. Further, the lower ends of the brackets 2 are in close contact with each other. Reference numeral 5 denotes a recess for fitting a copper busbar with a semicircular cross section, which is formed in the lower end contact portion of the aluminum 2. Reference numeral 6 denotes a copper busbar with a circular cross section extending in the left-right direction, which is fitted into the recess 5 and clamped by the bracket 2, and is fixed with bolts 7 and nuts 8 passing through the bracket 2 on both upper and lower sides of the recess 5. There is. The copper busbar 6 is in the recess 5
The inner surface of the recess 5 is in close contact with the inner surface of the bus bar 6.
It serves as a clamping surface.

In the workpiece suspension for electrochemical surface treatment having such a structure, the workpiece S is suspended from the copper bus bar 6 via the hook 9 fixed to the upper end thereof. Then, the object S to be treated is immersed in the electrolytic solution 11 of the electrolytic bath 10 and subjected to anodization treatment.

The drawbacks of the conventional workpiece suspension for electrochemical surface treatment are as described above.

FIG. 3 shows an embodiment of this invention which eliminates the drawbacks of conventional products.

12 is a female screw hole formed at a position corresponding to the recess in the bracket 2 and passes through the bracket 2 in the front-rear direction; 13 is a copper conductive bolt that is screwed into the female screw hole 12 from the outside and whose tip is exposed in the recess 5. (conductive member) whose tip is in contact with the copper bus bar 6. Therefore, even if aluminum oxide is generated on the surface of the bracket 2, especially on the inner surface of the recess 5, the copper busbar 6 and the aluminum bracket 2 are always electrically connected through the copper conductive bolt 13 and the inner surface of the female screw hole 12. connected to.

In the above embodiments, bolts are used as conductive members, but screws, pins, etc. may be used instead. Furthermore, in the above embodiment,
Although both the front and rear brackets are provided with conductive members, only one of the brackets may be provided with a conductive member. Further, the bus bar fitting recess 5 is not necessarily required.

[Brief explanation of the drawing]

FIG. 1 is a front view of a conventional example, and FIG. 2 is an enlarged sectional view taken along the - line in FIG. 1. FIG. 3 is an enlarged sectional view of a part corresponding to a part of FIG. 2 showing an embodiment of this invention. 1... Hanging main body, 2... Aluminum bracket, 6... Copper bus bar, 12... Female screw hole,
13...Copper conductive bolt (corrosion resistant conductive member).

Claims (1)

[Scope of utility model registration request] A suspension main body 1 having conductivity, a pair of aluminum brackets 2 fixed to the suspension main body 1 at the upper end and extending downward, and a copper busbar 6 clamped to the lower end of the bracket 2. In this electrochemical surface treatment workpiece suspension, a hole 12 is formed in the clamping surface of the copper busbar 6 in at least one of the pair of brackets 2, and the hole 12 has a corrosion-resistant material. A workpiece suspension for electrochemical surface treatment, in which a conductive member 13 having a conductive member 13 is fitted and a part of the conductive member 13 is in contact with a copper bus bar 6.