JPH0580545B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for producing a galvanized wire, in particular a galvanized wire capable of forming a healthy thick galvanized layer, by a hot-dip plating method.

[Prior Art and Problems] A general apparatus for manufacturing galvanized wire by the hot-dip plating method has a configuration as shown in FIG. 2, for example. That is, after the core wire 10 is pretreated in the pretreatment tank 1, it is heated to a predetermined level in the heating tank 2, and the inside of the plating tank 3 is vertically pulled up to form the plating wire 1.
1, cooled by a cooler 5 to obtain a cooled plated wire 11', and wound by a winder 6 to obtain a product.

Therefore, in order to produce a thick plated wire using the above-mentioned apparatus, the time of the core wire 10 in the melting tank is shortened, and the core wire is melted while the temperature is relatively low, so that the core wire is not heated by the molten metal. A method is used in which the core wire is passed through the metal to solidify the molten metal around the core wire and then pulled up.

However, when a thick hot-dip galvanized wire is manufactured by the above method, the plating bath inevitably becomes brittle because it has a cast structure. In other words, intergranular cracks occur in the plating layer made of the cast structure, making subsequent processing impossible. For this reason, not only is it impossible to draw the plating wire to reduce its diameter, but in extreme cases, even when passing through the pulley of the plating device itself, the bending causes cracks in the plating tank. There are even things to do. Under such conditions, even if thick plated wire could be obtained, its uses would be extremely limited. In recent years, wire cutting, which is one of the electric discharge machining techniques, has become widely adopted, and galvanized brass wire is recommended as the electrode wire in this case, so it is necessary to use galvanized brass wire as the base material to improve productivity. There is a strong desire for thick zinc-plated brass wire, and the demand for healthy thick zinc-plated wire that does not cause cracks is rapidly increasing.

[Object of the Invention] The present invention has been made in view of the above-mentioned circumstances, and provides a wire that does not cause cracks even when thickly plated using the melt plating method, and can be freely drawn and bent. The purpose of the present invention is to provide a method for producing galvanized wire that can be manufactured using a galvanized wire.

[Summary of the Invention] That is, the gist of the present invention is to perform a predetermined rolling process at a predetermined temperature range after producing a plating wire, thereby destroying the cast structure of the plating bath and destroying the grain boundaries. The aim is to obtain thick plated wire that can be freely processed and bent by eliminating the root cause of cracking.

[Example] This will be explained below based on examples.

FIG. 1 is an explanatory diagram showing the manufacturing situation of the plated wire according to the present invention, in which the same reference numerals as in FIG. After that, it is vertically pulled up in the plating tank 3 to become the plating wire 11, and is cooled by the cooler 5 to become the cooled plating wire 11'.
The cooled plated wire 11' is rolled by the roll 10, becomes the processed plated wire 12 according to the present invention, and is wound up by the winder 6. By going through this rolling process, the cast structure of the plating bath is destroyed, and it is possible to obtain a healthy thick plating layer that does not cause intergranular cracking.

However, the above-mentioned rolling is not unconditional, but has optimum conditions. That is, the temperature of the plated wire during rolling is preferably in the range of 100 to 300°C, and the degree of working at that time is also preferably 5 to 25% in area reduction. Zinc has poor workability at low temperatures, and if the processing temperature is below 100°C, cracks will occur during rolling itself. In addition, at temperatures above 300℃,
The viscosity of the plating layer is strong, and the occurrence of adhesion to the roll causes surface irregularities, making subsequent wire drawing impossible. As for the degree of work, if it is less than 5%, the degree of work is too small and the destruction of the cast structure is insufficient, and if it is more than 25%, the processing conditions for the plating layer become severe, and the process of forming the plating layer during rolling becomes difficult. This causes cracks to occur.

Example A brass wire with a wire diameter of 2 mm is used as the core wire 10, and the pretreatment tank 1 is
After cleaning the surface and passing through a heating furnace 2 in a reducing atmosphere to preheat the core wire 10 to about 150°C,
Plating tank 3 holding 99.99% zinc at 450℃
I let it pass inside. In this case, the length of the wire passing through the plating tank is 20 mm, the speed of passing the wire is 30 m/min, and after the predetermined plating, the plating thickness is adjusted using the squeezing die 4. A plating wire 11 with a diameter of 2.4 mm was obtained.

The blind wire 11 thus obtained was cooled by a water cooler 5, but at this time, by changing the water temperature, flow temperature, and water cooling length of the water cooling device,
The temperature of the cooled plated wire 11' after cooling was varied to obtain cooled plated wires 11' having various temperatures. The cooling plating wire 11' is connected to the grooved rolling roll 7.
The rolling process was performed by changing the rolling groove diameter of the roll.

Table 1 shows the surface condition of the plated wire, the self-diameter winding test, and the results up to a diameter of 1 mm for the plated wire according to the present invention manufactured as described above and a comparative example in which the rolling temperature and degree of workability deviate from the above-mentioned optimal conditions. This shows whether or not wire drawing is possible. As is clear from Table 1, at the rolling temperature
5 to 25 in the range of 100 to 300℃ and processing degree
% range, none of the comparative examples obtained good results, whereas the products according to the present invention within the above temperature and processing ranges all showed good expected characteristics. I know that I can have it.

[Effects of the Invention] As described above, according to the method for manufacturing a plated wire according to the present invention, it is possible to easily obtain a core wire or a thick galvanized wire that is extremely easy to bend, such as an electrode wire for wire cutting. It exerts its power in the production of products, and its effectiveness should be highly evaluated.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of a plating device according to the present invention, and FIG. 2 is an explanatory diagram showing a conventional plating device. 3... Plated layer, 5... Cooler, 7... Roll, 10... Core wire, 11... Plated wire, 11'...
... Cooling plating wire, 12 ... Processing plating wire.

【table】

Claims (1)

[Claims] 1 When manufacturing a galvanized wire by the hot-dip galvanizing method, after the zinc around the core wire has solidified, the degree of processing is reduced once while the temperature of the galvanized wire is in the range of 100 to 300℃. A method for manufacturing galvanized wire that involves rolling so that the area ratio is 5 to 25%.