JPS6299446A - Manufacture of galvanized wire - Google Patents

Abstract

PURPOSE:To manufacture a galvanized wire capable of wire drawing and bending freely, by manufacturing a plated wire and then by applying prescribed working by rolling to the above plated wire while it is in a specific temp. range. CONSTITUTION:A core wire 10 is passed through a pretreatment tank 1 and a heating tank 2 and then pulled up perpendicularly through a plating bath 3 to be formed into a galvanized wire 11. The plated wire 11 is cooled by means of a cooler 5 in to a cooled plated wire 11', which is subjected to working by rolling at 5-25% draft by means of a couple of rolls 7 while its temp. is in the range of 100 to 300 deg.C. Then the resulting worked plated wire 12 is wound up by means of a winder 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for producing a galvanized wire, particularly a galvanized wire capable of forming a sound thick plated zinc pattern by a hot-dip plating method.

[Prior Art and Problems] A general apparatus for producing galvanized wire by hot-dip plating 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, pulled up vertically in the plating tank 3 to form the plated wire 11, and cooled by cooling in the cooler 5. A product is obtained by obtaining a plated wire 11- and winding it up using a winding machine 6.

Therefore, in order to produce a J: thick plated wire using the above-mentioned apparatus, the passage time of the core wire 10 in the melting tank is shortened, and the molten metal is passed through the melting tank at a relatively low temperature when the core wire is not heated. A method is used in which the core wire is passed through the molten 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 layer becomes a cast structure, so it is inevitable that the wire will become brittle. In other words, intergranular cracks occur in the plated layer made of the cast structure, making subsequent processing impossible. For this reason, not only is it impossible to draw and reduce the diameter of the plated wire, but in extreme cases, even when passing through the pulley of the plating equipment itself,
The bending may even cause cracks in the plating layer. Under such conditions, even if thick plated wire could be obtained, its uses would be extremely limited.

In recent years, wire cut machining, which is one of the electric discharge machining techniques, has become widely adopted, and since galvanized brass wire is recommended as the electrode wire in this case, it is necessary to use the base material to improve productivity. There is a strong desire for a thick galvanized brass wire, and the demand for healthy thick galvanized wire that does not cause cracks is rapidly increasing.

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

[Summary of the Invention] The gist of the present invention is to perform a predetermined rolling process in a predetermined temperature range after manufacturing a plated wire,
By destroying the cast structure of the plated layer and eliminating the source of wrinkles at the grain boundaries, the aim is to obtain a thick plated wire that can be freely processed and bent. .

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

FIG. 1 is an explanatory diagram showing the manufacturing situation of a plated wire according to the present invention, and the same reference numerals as in FIG. 2 indicate the same configurations. After passing through the pretreatment tank 1 and the heating tank 2, the coated wires 11 and 4 are cooled by the cooler 5 as they are vertically pulled up inside the wire tank 3. Metsu: 1- line 11- yell.

The cooled plated wire 11- is rolled by the []-ru 10 to become the processed plated wire 12 according to the present invention, and is wound up by the winder 6. Through this rolling process, the cast structure of the plated layer is changed. It is possible to obtain a healthy, thick plating layer that is free from cracking and intergranular cracking.

However, the above-mentioned rolling is not that of the previous strip A'1, 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 processability at low temperatures, and the processing temperature is 100℃.
In the following, cranking occurs due to rolling itself. Furthermore, at temperatures above 300° C., the plating layer has a strong viscosity and sticks to the roll, resulting in unevenness on the surface, making subsequent wire drawing impossible. Furthermore, with regard to the working degree, if it is less than 5%, the working degree is too small and the destruction of the cast structure is insufficient, and if it is more than 25%, the processing conditions for the plated layer become severe, and the plated layer cannot be processed during rolling. This causes cracks to occur.

Example Brass wire with a wire diameter of 2 mm was used as the core wire 10, its surface was cleaned in a pretreatment tank 1, and the core wire 10 was preheated to about 150° C. by passing through a heating furnace 2 in a reducing atmosphere. %
of zinc was passed through the plating bath 3 maintained at 450°C. In this case, the length of the core wire passing through the plating bath is 20 mm.
The passing speed of the core wire was 30 m/min, and after the predetermined plating, the plating thickness was adjusted using the squeezing die 4 to obtain a plated wire 11 with a plated layer thickness of 0.2 mm and a plated wire diameter of 2.4 mm. .

The thus obtained plated wire 11 was cooled by a water cooler 5, but at this time, the temperature of the cooled plated wire 11- after cooling was changed by changing the water temperature, flow rate, and water cooling length of the water cooling device. By varying the temperature, cooling plated wires 11- of various temperatures were obtained. The cold plated wire 11- was rolled using a grooved rolling roll 7, and the degree of processing at this time was changed by changing the groove diameter of the roll.

Table 1 shows the surface condition of the plated wire, the self-diameter winding of the plated wire according to the present invention produced as described above, and the comparative example in which the rolling temperature and working degree were outside the above-mentioned optimum conditions, respectively. This shows whether it is possible to draw the wire to the diameter. It is clear from Table 1 that 4r is true,
Comparative examples with rolling temperatures in the range of 100 to 300°C and working degrees in the range of 5 to 25% have not yielded good results. It can be seen that all the products according to the present invention within the range have good expected characteristics.

[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 thick galvanized wire that is extremely easy to bend or bend. It is highly effective in the production of products such as, and its effectiveness should be highly praised.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of a plating apparatus according to the present invention, and FIG. 2 is an explanatory diagram showing a conventional plating apparatus. 3... Plating layer, 5... Cooler, 7... Roll,
10... Core wire, 11... Plated wire, 11'... Cooling plated wire, 12... Processed plated wire. Agent Patent Attorney Fujio Sato

Claims (1)

[Claims] (1) When manufacturing galvanized wire using 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°C. A method for producing galvanized wire, which involves rolling so that the surface area becomes 5 to 25%.