JPS5897419A - Method and device for wire drawing - Google Patents

Abstract

PURPOSE:To effectively utilize the heat produced in wire drawing, by properly controlling the flow rates of cooling water and a lubricating oil used for wire drawing basing on the temperature of a wire rod at the exit of a wire drawing machine, and preventing the radiation of working heat produced in the drawing. CONSTITUTION:When a wire drawing machine 6 is driven, the flow rate of lubricating oil 3 is sufficiently restricted by a motor valve 11 so that the surface temperature of a wire rod 8-2 at the exit of the machine 6 is <=300 deg.C. When it reaches said temperature, the opening of the motor valve 11 is made slightly larger to set the surface temperature of the wire rod 8-2 to be slightly lower than 300 deg.C. The set temperature is observed by a radiation thermometer 13 and is kept approximately constant by feeding back an output of the thermometer 13 to the opening of the valve 11. The wire rod 8-2 is successively introduced into a continuous annealing machine 9, thus an electric power consumed in annealing is reduced because of the remaining heat of the wire rod.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved wire drawing method and a wire drawing apparatus used therefor.

In conventional line machines, it is essential to continuously supply a considerable amount of furnace cooling water or lubricating oil that also serves as cooling, due to quality issues such as wear of the eyes and dies, surface quality and tensile strength of the wire rod. . For this reason, the processing heat of the wire generated during wire drawing is absorbed by the flow of these fluids, making it difficult to utilize it effectively.

To describe this in more detail based on FIG. 1 showing the lubrication system of a conventional slip type continuous wire drawing machine, the lubricating oil supply and recovery pipe 5 has a relatively large opening and is connected to the die 7. The flow rate of the large amount of lubricating oil supplied is controlled by the flow rate adjustment valve 4! The lubricating oil supply pump 2 also needs to have a large capacity.

On the other hand, the machining heat υ generated by curve machining on line 8-1 is carried away by the large amount of lubricating oil supplied in this way.
The temperature of the wire rod 8-2 at the exit of the wire drawing machine drops to around 80° C., and the wire rod 8-2 is cooled to an insufficient temperature for f-heating required before entering, for example, continuous annealing test 9.

The object of the present invention is to solve the above-mentioned drawbacks in the prior art, and to effectively utilize the heat of wire drawing to increase the power of the drawing gland of the wire drawing machine, the annealing power of the continuous annealing machine, and the supply pump of lubricating oil and/or cooling water. It is an object of the present invention to provide a wire drawing method that reduces the required power overall, and a device suitable for use therein.

The present invention will be explained in detail below with reference to embodiments shown in the drawings.

Figure 2 shows an embodiment in which the present invention is applied to a slip type continuous wire drawing machine, and this wire drawing machine is basically the same as the conventional wire drawing machine shown in Figure #8.1. It is a team. In Fig. 2, after the drawing machine 6 starts operating, the flow rate of the lubricating oil 3 is sufficiently reduced by the motor valve 11, and after a few minutes, the surface temperature of the wire rod 8-2 at the wire drawing machine outlet reaches 300°C or higher. so that it becomes

If this state continues, the wire rod will not limp on the capstan 12 in a direction perpendicular to the traveling direction, eventually causing wire breakage. Therefore, in the present invention, after this temperature is reached, the opening degree of the motor pulp 11 is increased by one degree, and the surface temperature of the wire rod 8-2 is set to an appropriate value that is 5 degrees lower than 300°C.

According to the present invention, this set temperature is constantly monitored by the radiation thermometer 13, and is kept constant by feeding back the output of the thermometer 13 and the opening degree of the motor pulp 11. Accordingly, the temperature of the wire strip 8-1 rises, so that the pulling force becomes smaller and the required power of the elongation Ia machine 6 decreases. In this case, since the temperature of the wire 8-1 is high, oxidation of the wire becomes a problem. Therefore, in the present invention, the wire rod 8-1 is oxidized by means such as sending an atmospheric gas 10 for preventing oxidation into the inside of the wire drawing 1 or sprinkling a little cooling water on the capstan 12 to generate steam. prevent.

By drawing the wire as described above, the flow rate of the lubricating oil 6 becomes extremely small, making it possible to significantly reduce the capacity of the lubricating oil supply pump 2.

Furthermore, when the continuous annealing machine 9 is connected to the elongation slot 6, the temperature of the wire 8-2 is close to 600°C, so the wire should be sufficiently preheated before it is received. Therefore, it is possible to reduce the annealing power, and it is possible to save power overall.

The annealing power saved by the continuous annealing machine in the above-mentioned embodiments is determined by the amount of heat retained in the wire, which is at a high temperature at the exit of the wire drawing machine.
is equal to nu. FIG. 3 shows the relationship between the annealing voltage and the elongation rate in a continuous annealing machine using a fracture-treated wire TPO (tough pitch copper) and using the surface temperature of the wire at the outlet of the wire drawing machine as a parameter of t+51-.

Table 1 also shows the power consumption (K) of the present invention compared to the conventional method.
This shows a comparison of W).

From the above, since the amount of lubricating oil to be supplied to the wire drawing machine is significantly reduced compared to the conventional one, it is sufficient to use a pump with the same water head and a small flow rate, and in the present invention, the amount of lubricating oil to be supplied to the wire drawing machine is approximately one-fifth of the conventional one. A pump capacity of about 100 liters is sufficient, and even within the wire drawing machine, it is possible to reduce the drawing force due to the increase in wire temperature and the resulting reduction in the required power by about 5 liters, which is overall compared to the conventional technology. Therefore, the present invention can save power by approximately 15%.

Although the present invention has been described above with respect to a slip type continuous wire drawing machine, the present invention also brings about extremely large effects in a non-slip type continuous wire drawing machine when used in combination with a continuous annealing machine.

[Brief explanation of the drawing]

Figure 1 shows the lubricating oil system of a conventional wire drawing machine, Figure 2 shows an embodiment of the present invention, and Figure 6 shows the relationship between the annealing voltage of a continuous annealing machine and the elongation rate of the wire. FIG. 1. Lubricating oil tank 2... Lubricating oil supply pump 3
・Lubricating oil 4・・Flow rate adjustment valve 5・・Piping 6・・Wire drawing machine 7・・Dice
8-1... Wire rod inside drawing machine 8-2... Wire rod at outlet of wire drawing machine 9... Continuous annealing machine 10... Atmospheric gas 11...
Motor valve 12... Capstan 13... Radiation thermometer It゛ Buried Patent Attorney Sato Fujiwara TI (jJJ T2 (fJ 7'3 1'MoeomiN'If fi (v) Continuation of page 1 @ Inventor: Akira Tomioka - 1500 Kawajiri-cho, Hitachi City, Toyoura Factory, Hitachi Cable Co., Ltd.

Claims (1)

[Scope of Claims] 1) Dissipation of processing heat generated during wire drawing by properly controlling cooling water and wire drawing lubricating oil flowmeters based on each braid of wire at gland exit 1-1. A curve processing method characterized in that the annealing treatment of a wire rod is facilitated by preventing. 2) In continuous wire drawing equipment such as a wire machine and an annealing machine installed in series with it, which are continuously supplied with cooling water and/or wire drawing lubricating oil, the drawn wire rod exits the wire drawing machine. Wire drawing processing device characterized by a temperature detection device that detects temperature, and a control device that controls the amount of cooling water and/or lubricating oil flowing into the wire drawing machine based on the temperature detected by the temperature detection device. .