JP2536952B2 - Jig for colored zinc plating - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a jig for colored zinc plating.

(Prior Art) The present applicant has disclosed Japanese Patent Application Laid-Open No. 61-288040 (Japanese Patent Application No.
No. 9788), a metallic material such as steel is immersed in a zinc plating bath containing 0.1 to 1.0% by weight of a coloring element such as Ti, Mn, and V, and plated, and then 450 to 700 in a heating furnace in an oxidizing atmosphere.
Heat at ℃, adjust the heating time, blue,
We proposed a method to color parts such as green, golden, yellow, and purple. With this method, excellent corrosion resistance and beautiful color can be obtained by one-time surface treatment, and chemical conversion treatment before coating and post-coating steps can be omitted.

Heretofore, the present applicant has manufactured the above-mentioned colored parts for uses such as garden products, concrete pillar bands, electric wire ground wire caps, utility pole protection plates, and the like. In these parts, it is not preferable to expose the galvanized surface because of harmony with the surrounding environment and because the galvanization gradually becomes dull and becomes unaesthetic.

Conventionally, when plating these parts, the jig used to immerse the material to be treated in a galvanizing bath, pull it out of the galvanizing bath, and then insert it into the heating furnace is as small as possible so that the frame is not distorted. It was a frame-shaped assembly of several steel bars and strips.

FIG. 5 shows an example of a conventional jig. The part to be processed 10 is hung on a suitable part of the frame by a wire or placed on the support plate 7 or the like, and is subjected to a series of color development processing of plating and heating.

(Problems to be Solved by the Invention) However, when color development processing is conventionally performed using a jig, color unevenness often occurs in a part of a part or several parts of two or more parts. In order to prevent this, the heating time, the heating temperature, the amount of the coloring element, and the like were variously devised, but a satisfactory result could not be obtained. Therefore,
The present inventor has conducted extensive studies on the structure of the jig and completed the present invention.

(Means for Solving the Problems) The present invention relates to an improvement of a plating jig for colored zinc plating for processing a large component having a total length, width, and length of 1500 mm or more.

The first jig of the present invention has a total length, width, and length of 1500
In a plating jig for color zinc-plating a plurality of long and large parts of mm or more, one or more of the above parts should be horizontally spread so that the average distance between them is 2 to 100 mm and the entire plating surface is exposed. It is characterized in that the first metal plate is arranged and arranged at a distance of at least 2 to 100 mm from both ends of the component together with the jig.

 Hereinafter, the configuration of the jig of the present invention will be described.

First, in the jig of the present invention, when processing two or more parts, it is necessary to set the interval within a range of 2 to 200 mm.
Here, the interval is an average interval between two parts.
If the gap is less than 2 mm, it is difficult for the plated metal to enter the gap between the parts, and the plating thickness will be thin, so the gap must be 2 mm or more. On the other hand, if the spacing exceeds 200 mm, only one of each part will be the same as when it is immersed in the plating bath, and uneven coloring will easily occur.
Limited to m or less.

The parts are detachably arranged in the frame so that the entire plating surface is exposed and the intervals are as small as possible, such as parts having a small heat capacity such as wires, screws, and pins.

Furthermore, 2 from one part or two or more ends
The metal plate is placed integrally with the jig with a space of 100 mm.
The metal plates are present at both ends of the component where uneven coloring occurs and prevent uneven coloring at both ends of the component. This distance is also limited to the range of 2 to 200 mm for the same reason as that of the parts. It is necessary that the metal plate faces both ends of the component, that is, the surface of the metal plate and both ends of the component face each other. Furthermore, the area of the metal plate is preferably equal to or larger than the area of the outer peripheral surface of the component. The metal plate may be present on at least a part of the outer peripheral surface, but is preferably present on 30% or more of the outer peripheral length. Also, the direction in which the plate surface of the metal plate faces is
It is necessary to orient the plate surface of the metal plate so as to be parallel or oblique to the dipping direction of the component in the plating bath. Unlike this orientation, when the plate surface is located above or below the part,
The immersion timing of the metal plate and parts in the plating bath is different,
As a result of the different thermal behaviour, the effect of uniform coloring is small. Parts are stacked one step on the jig. When stacked in multiple stages, the upper part and the lower part have different immersion timings in the plating bath, resulting in different thermal behaviors. As a result, different colors are likely to occur in the upper part and the lower part. Further, the sagging of the upper part is applied to the lower part, and the applied part has a different color.

Furthermore, in addition to the above-mentioned metal plate (first metal plate), a second plate
It can also be provided with a metal plate. That is, according to a preferred embodiment of the present invention, the second part is provided approximately in the middle between the respective parts.
The metal plate of is placed integrally with the jig. The second metal plate of this jig is effective when the effect of preventing uneven coloring due to the parts arranged at intervals is small. That is, when the shape of the surfaces facing each other is a curved surface, a deformed surface with many irregularities, etc., uneven coloring is likely to occur on the surface portion, so that a second metal plate having a simple shape, that is, a flat surface By arranging them in between, color development can be made uniform. The second metal plate must be placed in the middle of the parts to have the same effect on each part.

In the second jig according to the present invention, only a part of the parts face each other with a predetermined interval, but the other parts do not face each other, or even if they face each other, the interval is not.
It is much larger than 100mm, and it is a jig that is applied in the same case as if it were not facing each other in terms of thermal behavior.

The second jig is a plating jig for coloring and galvanizing a plurality of long large-sized components having a total length, width, and length of 1500 mm or more. ~
Exposing the entire plated surface of all these parts horizontally arranged in one row without facing each other with an interval of more than 100 mm or facing the other parts with an average interval of 100 mm. And the metal plate is disposed integrally with the jig at a distance of at least 2 to 100 mm from both ends of the component, and the remaining portion is spaced at a distance of 2 to 100 mm from the metal plate. Is a jig for colored zinc plating. This jig has the same basic structure as that of the first jig, but is provided with a second metal plate, and the thermal behavior of the parts facing each other with an interval larger than the first interval is as if other parts. The parts are arranged so as to face each other with an appropriate interval so that color development is uniform in all parts.

(Function) The reason why uniform color is obtained by the above jig is considered as follows.

In the case of a long product, color unevenness occurs at both ends.
For example, when the coloring method is performed with Ti, oxygen in the atmosphere is bonded to Ti that is concentrated on the surface layer of the plating, and a TiO ₂ film is formed on the surface layer. Various colors are generated by the change in the thickness of the film. Therefore, after plating a long product, the part that comes into contact with the atmosphere most during the cooling process and has the fastest cooling rate is at both ends. A high cooling rate means that the reaction between Ti and oxygen at both ends ends quickly, that is, the formation of a TiO ₂ film is thin.

On the contrary, the central part of the long product has a slower cooling rate than the both ends and the TiO ₂ film is thickly formed.

For the above reasons, the film thickness of TiO ₂ is different between the central part and both ends of the long product, and as a result, the color of both ends changes.

On the other hand, considering only the center part, there are few simple ones formed by steel material and usually it is formed by a combination of steel materials with different thicknesses, thin things cool faster and thicker due to the difference in heat capacity. Things cool slowly. Therefore, a color difference finally occurs. If plating of a component that basically causes such a color change is performed independently, color unevenness occurs at various parts.

Therefore, it is only necessary to perform plating as a single item and attach a metal plate to the part that is cooled quickly to slow down the cooling rate.
There is a problem in profitability if plated one by one. Therefore, the idea is to make the part that cools quickly close to the part that cools quickly for other parts so as to delay the cooling speed by thermal compensation of each other. By doing so, it is possible to increase the number of parts to be treated in one plating and to suppress the occurrence of color unevenness.

However, even if such a method was taken, the problem of color unevenness at both ends was not easily solved, but it could be solved by combining with a metal plate.

 Hereinafter, the present invention will be described with reference to examples.

(Embodiment) FIGS. 1 and 2 show a jig according to an embodiment of claim 1 of the present invention, FIG. 3 shows a jig of the embodiment of claim 2, and FIG. It is a drawing in which the jigs of the examples are all shown at an actual size of 1/16 and the dimensions are given in mm.

The jig shown in FIG. 1 is composed of an outer frame in which steel bars 1 are assembled in a frame shape, and a thin plate 2 is passed to the steel bars 1 on both sides of the frame.
Vertical bar spacers 1c are fixed between the 1a and 1b and to the support plate 2 to reinforce the entire frame. The component 10 is a long steel material having a C-shaped cross section, and both ends thereof are fixed to a part of the jig by the wires 4.

Reference numeral 5 is an iron plate fixed to the front and rear end faces of the frame with a space of 100 mm from the component 10. Since the iron plate 5 has no relation to the jig function of handling parts, it is referred to as a dummy plate in the following description. The dummy plate 5 prevents uneven coloring at both ends of the component 10.

FIG. 2 is a drawing with the same reference numerals as FIG. parts
Reference numerals 10a, 10b, and 10c are long steel members in FIG. 1, but two long members are paired so as to face each other at an opening having a C-shaped cross section. The steel bars 1d are arranged in a zigzag shape on one side of the frame lateral surface of the jig, the upper and lower steel bars 1a and 1b are fixed, and the dummy plate 5c is fixed to the steel bars. The dummy plate 5c has almost the same length as the component 10c and is arranged at a distance of 120 mm from the component 10c.
Prevent uneven coloring on the side of c). That is, the dummy plate 5
If there is no c, uneven coloring occurs in places throughout the entire length of the component 10c, so the dummy plate 5c is provided so as to face 10c.

FIG. 3 shows the same parts 10a, 10b, 10c and the same jig as in FIG. 2, but in order to color-plate the inner surface of each part as well, the distance between the pair of long materials is widened to 30 mm, and On the dummy board
The arrangement of 5d is different from that shown in FIG.

Fig. 4 shows an angle section member bent at about 130 ° 10
It is a jig. The parts 10 can also be perfectly opposed, but this will result in a dense and rough arrangement of the parts in the jig and uneven thermal behavior, so only a part of It is preferable that they are opposed to each other and the arrangement of parts is uniform in the entire jig. The resulting "T" shaped dummy plate (second
Metal plate) 5e is placed at an interval of 180 mm.

The jig shown in FIG. 4 is the same as the jig shown in FIG.
Metal plate) 5e is added. In FIG. 4, the protrusion 10d ′ of the dummy plate 5e (second metal plate) affects the thermal behavior / plating behavior, and as a result, the dummy plate 5 has a thermal behavior / plating behavior.
It no longer affects the plating behavior.

(Effects of the Invention) As described above, according to the present invention, the coloring of the colored zinc plating can be made uniform, so that the colored zinc plating is of great value when applied to various parts.

[Brief description of drawings]

1 and 2 are perspective views showing an embodiment of a jig according to claim 1 of the present invention, and FIG. 3 is a perspective view showing an embodiment of a jig according to claim 2 of the present invention. FIG. 5 is a three-dimensional view showing an embodiment of a jig according to claim 3 of the present invention, and FIG. 5 is a three-dimensional view of a conventional jig.

Claims (3)

(57) [Claims] 1. A plating jig for coloring and galvanizing a plurality of long, large-sized components having a total length, width, and length of 1500 mm or more, wherein one or more of the components have an average interval of 2 to each other.
Colored zinc characterized in that it is 100 mm and is arranged horizontally in a row so as to expose the entire plating surface, and a metal plate is arranged integrally with the jig at a distance of at least 2 to 100 mm from both ends of the component. A jig for plating. 2. A metal plate facing a side surface of the component and having a flat surface substantially at the middle of the uneven surface, the curved surface or the irregular surface between the components is arranged integrally with the jig. The described colored zinc plating jig. 3. A plating jig for coloring and galvanizing a plurality of long and large parts having a total length, width and length of 1500 mm or more, wherein a part of each of the plurality of parts is 2 to 100 m from each other.
Expose the entire plating surface of all these parts horizontally arranged in a single row, facing each other with an average distance of m and facing the rest with an interval of more than 100 mm or not facing other parts And the metal plate is arranged integrally with the jig at a distance of at least 2 to 100 mm from both ends of the component, and at the remaining portion from 2 to 2 mm from the portion.
A jig for colored zinc plating, characterized in that a metal plate is arranged integrally with the jig with an interval of 100 mm.