JPS6040933B2 - Rolled wire bar guidance method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for obtaining a wire rod with excellent dimensional accuracy during rolling of a wire rod or comb rod (hereinafter abbreviated as wire rod).

Wire rods are usually drawn at a secondary processing manufacturer to reach the final product, but if the dimensional accuracy of the wire is poor, uneven wear of the die will occur during wire drawing, which will adversely affect the life of the die. This results in defects in product dimensions, surface texture, material quality, etc. after the wire. On the other hand, recently, as wire rod dimensional accuracy has improved, a method has been implemented in which the wire drawing step is omitted by directly rolling the wire to the finished product size, and improving dimensional accuracy has a great effect in this respect as well. As is well known, wire rod rolling equipment is constructed by appropriately arranging roll holes such as oval round diamond squares. A roller guide device is installed for yielding. By the way, in the conventional roller guide device, the rollers are fixed at predetermined intervals depending on the diameter of the wire rod to be rolled. The narrower the distance between the rollers, the better the guiding effect, but on the other hand, there is a problem in that due to dimensional fluctuations in the wire, the tip of the wire may hit the rollers, making roll errors more likely.
For this reason, in actual operation, priority is given to preventing misrolls, so the roller spacing is set with some margin in relation to the wire diameter. For this reason, as shown in FIG. 1a, when the wire rod is held by the rollers, it collapses, and rolling in this state causes a problem in that dimensional accuracy is impaired. An object of the present invention is to obtain a wire rod with excellent dimensional accuracy during rolling of bran material (including haru material). The rollers are fixed at a predetermined interval until the tip comes next to the roller of the roller guide device, and the roller spacing is reduced until the wire tail weave passes through the roller after the wire tip is bitten. The method is characterized in that the rollers are returned to the predetermined spacing after the tail end of the wire passes through the rollers. Embodiments of the present invention will be described below based on the drawings. In Fig. 2, 1 is a wire rod rolling machine, 2 is a rolling roll, 3 is a roller guide device for guiding the wire rod, 4 is a hydraulic power source, 5 and 6 are solenoid valves, 7 is a drain, 8 is a hydraulic conduit, and 9 is the tip of the wire rod. 10 is a timer for timing the operation of the roller 17 (FIG. 3) of the roller guide device, and 11 is an electric detector. Wiring 12 is a current detector for detecting the load current of the rolling mill motor 13.

FIG. 3 shows a plan view of the roller guide device, in which 14 is the main body of the device, 15a and 15b are roller holders mounted on the main body via a shaft 16, 17a and 17b are lofts mounted on the roller holders, and 18 is a wire guide tube inserted into the main body 14.

19 is a hydraulic cylinder provided between the roller holders 15a and 15b, and the hydraulic conduit 8 is connected to the hydraulic cylinder.

A spring 20 is attached to draw the roller holders 15a, 15b toward each other.

Next, the operation will be explained. Before rolling, the bolt 21 is rotated as before, and the rollers 17a and 1 are rotated according to the diameter of the wire strip to be rolled.
7b are fixed at predetermined intervals. Next, when the tip of the line village passes the detector 9, the timer 10 starts operating. The timer is activated when the tip of the wire gets caught in the roller 17.
The roller holders 15a and 15b operate in the direction of the arrow, and the distance between the rollers 17a and 17b is reduced to output the wire S at a timing when the wire S is compressed. Each solenoid valve 5,
6 operates to the A side in response to a signal from the timer, pressure oil is introduced into the hydraulic cylinder 19 from the hydraulic source 4, and the roller 17 pinches the wire S as described above, and the wire is compressed as shown in FIG. 1b. It is guided into the roll hole shape of the rolling roll 2 while being held in a normal posture. When the tail end of the wire passes through the rolling roll 2, the load on the drive motor 13 is reduced, which is detected by the crab flow detector 12, and this signal causes each solenoid valve 5, 6 to operate to the B side. The force of the spring 20 causes the pressure oil in the hydraulic cylinder 19 to flow toward the drain 7 side.
The distance between the rollers 15a and 15b is widened and they return to their original positions in preparation for guiding the next wire rod. According to the present invention, when guiding the tip of the wire, which does not require the wire to be compressed by rollers, to the roll hole mold, the roller interval can be set somewhat wide.

This makes it possible to reliably prevent misrolls from occurring. On the other hand, while the wire is passing through the roll hole mold, by pressing the wire with rollers, it is possible to reliably prevent wrinkles and poor roundness due to the wire falling. In other words, the tip of the wire could not be made using conventional methods. Both of the functions of reliable guidance to the wire hole mold and prevention of falling of the wire rod can be obtained satisfactorily. In the present invention, the above method is performed for one or more roller guide devices.

In order to reduce the length of the defective wire shape, it is desirable to apply ball pressure to the wire as soon as possible after the wire passes through the roller, but if the roller is operated before the wire passes through the rohu, the wire The timer setting should allow some leeway as the rollers may hit the rollers.
Further, the pressure setting for the wire rod pressure varies depending on the material, shape, etc. of the wire rod, but it is desirable to set the pressure to the minimum necessary. If more pressure is applied than necessary, there is a risk that the wire may be covered with eaves or equipment trouble may occur, such as the roller being unable to rotate due to phosphorus on the roller bearing. Therefore, it is desirable to set the pressure steplessly so that it can be freely controlled depending on the type of rolled wire rod. In this embodiment, the present invention is applied to an oval shape, but it can also be applied to various square shape wires.
Further, the present invention can be applied to all wire rods and comb materials that are rolled through roller guides.

Next, the effects of this embodiment are shown in Table 1 in comparison with a conventional example in which the roller was fixed during line village yield.

Rolled material: Diameter of hard steel wire after rolling: 23.00 Side table I (Note) Hydraulic pressure: Hydraulic wire binding force at the inlet of hydraulic seeder; Pressure at roller position In Table 1, the higher the oil pressure, the smaller the deviation difference, and the lower the oil pressure is.
In the case of 0 kg/section, the difference in diameter is reduced by half compared to the conventional example.

Although this example uses hydraulic pressure,
As the driving source, various methods such as an electric motor, air pressure, etc. can be adopted.

[Brief explanation of drawings]

FIGS. 1a and 1b are explanatory diagrams of a state in which the twill material is attached to a roller, FIG. 2 is a diagram showing an embodiment of the present invention, and FIG. 3 is a plan view of the roller guide device. 1: Rolling machine, 2: Rolling roll, 3: Roller guide device, 4: Hydraulic source, 5, 6: Solenoid valve, 7: Drain, 8: Hydraulic conduit, 9: Wire rod tip passage detector, 10: Timer, 11: Electricity Wiring, 12: Current detector, 13: Rolling machine motor, 14: Roller guide device main body, 15: Roller holder, 16: Shaft, 17: Roof, 18: Wire guide tube, 19: Hydraulic cylinder, 20: Spring ,
21: Bolt. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. In a roller guide device for guiding the tip of a wire rod into a roll hole of a rolling mill, the rollers are fixed at a predetermined interval until the tip of the wire rod bites into the roller of the roller guide device, The distance between the rollers is reduced until the tail end of the wire bar passes through the rollers after the tip end of the wire bar is bitten, and after the tail end of the wire bar passes, the rollers are returned to the predetermined spacing. A method for guiding rolled wire rods, characterized by: