JPS6191333A - Heating method of wire rod - Google Patents

Abstract

PURPOSE:To heat a wire rod efficiently without causing damage thereof, by arranging electrodes contg. molten metal of low m.p. for electricity conduction heating on transporting line of wire rod at a necessary interval, and conducting electricity to the wire rod during transportation through the electrodes. CONSTITUTION:At least a pair of the electrodes 1, 1' for electricity conduction heating are arranged on linear transporting line of the wire rod 2 at a necessary interval to heat continuously the rod 2 during transportation. IN this method, the molten metal 3 of low m.p. contained in a molten metal bath vessel 4 is heated by a heat source 5, and used in molten state as electrodes 1, 1'. Which are connected to a power source 6, to conduct electricity to the material 2 therethrough. Thereby, the rod 2 is heated continuously without causing arc flaw, scratch flaw therein, efficiently and without arc generation with high voltage, high transporting velocity due to low contact resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method of heating a wire rod during transportation when carrying out spheroidizing annealing during production of the wire rod.

(Conventional technology) Conventionally, wire rods were annealed into spheroidization using an annealing furnace, but using an annealing furnace was inefficient, required a large space, and caused environmental problems inside and outside the factory. Occur. In addition, there is a concern that long-term residence in the furnace may cause oxidation, decarburization, and scale generation.

Therefore, the present applicant proposed that while conveying the wire in a linear manner, the electrode
After continuously heating the wire to the required temperature by direct energization with the wire, it is kept warm and slowly cooled using the heat retained in the wire.
The characteristic direct current annealing method for wire rods was published in 1984-'4.
It was disclosed in No. 6534.

(Problem to be solved by the invention) The applicant! The method disclosed in F#kai No. 58-46534 is a useful invention that can solve the problems inherent in the conventional method using an annealing furnace, but it uses a solid electrode called a roller as the energized heating electrode. It was found that the problem of inefficiency due to arc damage and scratches, and contact resistance was also found.In addition, if this method was used to increase the d voltage, more arcs would occur, so the voltage could not be increased. Therefore, there is a problem in that it is not possible to increase the wire transport speed in order to obtain a sufficient heating temperature.

(Means for Solving the Problems) The present invention has been made in view of the above-mentioned problems, and has no arc scratches or scratches, low contact resistance, and
It is an object of the present invention to provide a method for adding flA to a wire rod, which can increase the voltage and increase the wire transportation speed.

That is, the gist of the present invention is to provide a method for continuously heating a wire (2) during conveyance using energized heating electrodes (electronic heating electrodes) placed at required intervals on a conveyance line. A molten metal (31) with a low melting point is used as the electrode +11 ui. In FIG. ) is a heat source for maintaining the molten gold Fli 131 in a molten state, and (6) is a power source.

When heating the wire +21 using the above method, the first
As shown in the figure, heating may be performed using a pair of current-carrying heating electrodes il+ 111, but the second ei! As shown in J, a plurality of sets of energized heating electrodes +11 ui, . . . may be used for heating. In this case, one set of energized heating electrodes +7
+ tf + Reduce the power capacity of this wire and gradually increase the wire (2
) may be increased, or the power supply capacity may be kept constant and the conveyance speed of the wire 12) may be increased.

In addition, as for the 111 current-carrying heating electrodes used in the method of the present invention, if 1 inch is used, ';T 311~・+550''-
You can just use it now. Figure 3 is g'
This method uses rolls of Q to guide wire rod 1z into molten metal Ji 13+.
Suitable for cases where: Nasi, Figure 3) is a roll (7)
When there are three pieces, (b) shows the case where there are four pieces. Figure 4 shows the guide cylinder 18 at the top of the molten metal bath □ tank (41).
1 and feed the molten metal (31) into the guide cylinder (8) using the pump (9), and transfer the conveying wire +21 into the guide cylinder (8) into which the bath molten metal (3) was fed. Figure 5 shows a molten metal bath (4
The wire rod (2) is guided into the bathtub (16 in 41, the wire rod (2) is conveyed through the bathtub (141), and the wire rod (2) is conveyed through the bathtub (141). Apply a seal of sand, etc. to the inlet and outlet of the
This is what was installed.

Further, the molten gold fX131 for electrodes used in the method of the present invention is not limited to the same extent, but for example (f)
Product name U Alloy manufactured by Osaka Asahi Metal Factory (melting point: 47
~150℃, resistance: 36.74~56.33x104Ω
・fI@) etc. are suitable.

(Example) The method of the present invention was carried out on the following 81M cases. As a result, the conveying speed fta of the wire (2) can be lowered than when using conventional solid electrodes (conventionally 0. ．． 09 m/see -> 0°12 m/see by the method of the present invention], the wire was able to be penetrated with a force of 760"cK without any arc damage or scratches.

Wire rod = 9.3 cod diameter.

Electrode method: Use the one shown in Fig. 1. Molten metal: Uryo Roy (product name). Tuning source: 50 KW (voltage across the load: approx. 14 V) (effects of the invention). As described below. Since the method of the present invention uses molten metal as the current-carrying heating electrode, it does not cause arc scratches or scratches, unlike conventional solid electrodes, and improves efficiency due to low contact resistance. 1. Increase in pressure due to the fact that 0 is not generated 1. It has a great effect of increasing the wire transport speed

[Brief explanation of the drawing]

;1'% 1 [', jJ and 21st''!J is book: I
Schematic illustration of the O-ming method, 3rd r, '71G () tel
l ~:,,', 5 Fl rl Used in the method of the present invention. FIG. 9 is a diagram showing an example of a u-pole. 1) is an electrode, +21 is a wire, (31 is molten gold, ], (
51 is a heat source, (61 is a power source.

Claims (1)

[Claims] (1) Continuously energize the wire being transported by at least one set of current-carrying heating electrodes made of molten metal with a low melting point, which are arranged at a required interval on the transport line that transports the wire in a linear manner. A method for heating a wire, which is characterized by heating.