JPS58303A - Production of fine metallic wire - Google Patents

Abstract

PURPOSE:To make the production of fine wires with high efficiency and good dimensional shapes at a low cost possible by passing a drawn blank material through roller groups wherein four pieces of rollers facing each other assume one set thereby rolling the same and increasing rolling speeds in accordance with reduction of areas. CONSTITUTION:A drawn blank wire 1 obtained by rolling an ingot is coiled with a coiler 5 and is subjected to high temp. treatment. In cold drawing of the material 1, it is passed through a rectangular gap 4 formed by the combination of upper, lower rollers 3a, 3b, and right and left horizontal rollers 3c, 3d for the purpose of applying prescribed reduction of area. In this way, it is passed through the square gaps 4 of roller groups R1-R9 each consisting of four rollers. At least one of the four rollers is driven by a motor 7 and the sizes of the gaps 4 are so set as to decrease gradually. With a decrease in the gaps 4, the rolling speeds are increased gradually until a fine wire of a required wire size is obtained. The wire is coiled on a product drum 6.

Description

[Detailed description of the invention] It is.

When manufacturing various gold AM wires including steel wires,
Generally, raw materials (ingots) are made by blooming rolling or continuous casting, and then passed through a rough rolling mill with rolls cut with calipers, intermediate rolling mills, and finishing rolling mills to produce a material (ingot) with a diameter of 5 to 6 mm.
The wire drawing material is rolled into a wire drawing material of one diameter, and then the wire drawing material is pretreated and then drawn to the desired wire diameter.

Conventionally, this expansion/contraction method uses multiple drawing dies whose hole diameters are varied to obtain a predetermined area reduction rate, and the wire drawing material is sequentially applied to these drawing dies to reduce the cross-sectional area for each die. Specifically, the drawing die used was a hole die with a tapered hole, or a roller die in which grooves (large size) were formed on rolls with two sides facing each other.

However, all of these methods have the drawbacks of complicated processing steps, high costs, and difficulty in thinning wires. In other words, since a hole die and a roller die are used as drawing dies, in both cases, a drawing process using a winding roller called a capstan or drum is required for each step of the drawing process, which makes the wire drawing process discontinuous. As a result, machining speed and machining efficiency decrease.

Furthermore, since this is a technique for thinning the stretched 41 material while stretching it, it cannot be applied to materials with low tensile strength, and there is a drawback that the thinning materials are limited.

Furthermore, in the case of hole dies, wire breakage and uneven machining occur due to pull-out stress, etc., and it is not possible to achieve a large area reduction rate.Roller dies also reduce frictional resistance, but are prone to radial cracks on two planes. Therefore, it is difficult to obtain a large reduction in oij, and it is difficult to accurately finish the cross-sectional shape and dimensions. Furthermore, the method of pulling the elastic material requires a large forming driving force, and an intermediate winding device such as a capstan is essential, making the entire device large and complex. In order to obtain a thin metal wire, the large size (#ll) must be processed into an extremely small size, which further increases the manufacturing cost. The purpose of this invention is to provide a method that can produce thin wires of good size and shape at extremely high speed and with high efficiency using simple processes and equipment regardless of the wire material.

For this purpose, the present invention arranges q-rollers on four sides, upper and lower, left and right, and - so that a gap corresponding to the area reduction rate is obtained at the center, and "at least one roller among these four The wire drawing material is rolled from four sides by driving the rollers, and the required number of rollers with the same configuration are arranged in series, and the speed of these roller groups is controlled so that the rolling speed increases sequentially according to the area reduction rate. However, there is no intermediate tensioning process, and the wire drawing material is continuously rolled on all four sides until it reaches a thin wire of the desired wire diameter.

The present invention will be explained below based on the accompanying drawings.

FIGS. 1 to 5 show an embodiment of the method for producing a thin metal wire according to the present invention, in which 1 is a drawn wire material and 2 is a product, that is, a thin wire. There are no particular limitations on the steps involved in obtaining the drawn wire material 1 from the raw material. In other words, a material such as a billet is made by subjecting a metal ingot to a desired composition through blooming rolling, continuous casting, etc.1. After heating and soaking this material, it may be passed through a rough rolling mill, a finishing mill, an extruder, etc. to form wires having a diameter of, for example, about 5 to 6 mm. Then, this drawn wire material 1 is wound into a coil shape by a winding machine 5, and subjected to pretreatments such as pickling, water washing, and neutralization.

Next, the process moves on to cold drawing the wire drawing material 1, but the present invention is characterized in that this process is performed not by the conventional drawing method but by continuous rolling from four sides. That is, as shown in Figs. 1 and 2, a total of four opposing rollers, the upper and lower rollers 3g and 3, and the left and right horizontal rollers 3a and 3d, are introduced to give a certain reduction in area to the central part. A rectangular gap 4 is formed for this purpose, and at least one of the four rollers is configured as a drive roller by a motor 1 or the like. And these four opposing rows 23-13A, 3g,
A plurality of sets of rollers 3, each set being 3d, are arranged in series, and 1
The size of the rectangular cap 4 is set smaller in order so that the amount of compression is increased at a predetermined area reduction rate for the rollers R1 to R9 of each stage after the roller R8 of the stage. Adjustment of this rectangular gap 4 can be easily realized by making the distance between the roller axes variable.

In order to obtain a fine wire, the roller groups R1 to R are driven, and at the same time, the wire drawing material 1 is inserted from the winder 5 into the rectangular grooves 74 of the first stage roller R3. Upper and lower and left and right rollers 3 as 3
By rotations k, 3g, and 3d, the wire drawing material 1 is rolled from four sides to become a wire rod with a rectangular cross section and a reduced cross-sectional area, and then the wire drawing material 1 rolled in the first stage is rolled in the second stage a. −
Enter La R2. Since this roller also has a rectangular gap 4 formed according to the area reduction rate of one foot,
Again, rollers number 3, 3k, 3g, 34 on the 4 sides
It is rolled from four sides by the rollers of the third stage,
It is continuously compressed in stages, such as the rollers on the third stage.
A fine wire 2 with a diameter of 3 runs out from the last roller R0 and is wound onto a product drum 6. In addition, if the product wire diameter cross section is round, final shaping may be performed using a roller with a round groove.

In the wire drawing process by rolling as described above, it is necessary to arrange the roller groups R3 to Ro so that the amount of rolling increases at a constant area reduction rate, and the first stage roller It is important to set the roller circumferential speeds of the roller groups R2 to Ro so that the rolling speed of the wire increases as the area decreases sequentially from R3.

According to the present invention, 5.5-φ wire drawing material is formed with 9 stages of rollers.
Each roller that makes up the unit and roller group has a diameter of 150 mφ.
Table LM1 below shows the relationship between the area reduction rate and the number of roller rotations when a thin wire of 0.53 .mu.

The area reduction rate in the table is determined by using the strand cross-sectional area of the previous stage roller as the denominator and the strand cross-sectional area of the next stage roller as the numerator.

By controlling the drive of each roller in the roller groups R1 to R9 as shown in Table 1, it is possible to completely automatically process wires up to the target wire diameter, without requiring manual intervention. The drive control is performed by connecting the motors 5 that drive each of the three or more rollers in the roller groups R3 to R0 with a control system 8, and controlling the rotation speed corresponding to the rate of change of the cross-sectional area of the wire through the electrical equipment 10 and the computing unit 11. It is only necessary to give it to the controller 9, and this can be easily implemented using a nervo-type motor such as a hydraulic motor. In addition, instead of changing the roller speed, the diameter can be increased toward the later stages (the purpose can also be achieved by using weeping rollers, but with this method, the diameter of the final stage roller is 100 times larger than the first stage roller). It cannot be said to be industrially suitable because of the diameter.

o-5flpR1-R, upper and lower rollers 3a in K
S 3 k and the left and right rollers 3 g x 3 sf may be configured such that the widthwise edges of adjacent rollers are close to each other, but with this configuration, there is a risk that the excess material may flow out into a minute gap or into the shape of an r2 fin.

In order to prevent this, it is preferable to configure the two pairs of opposing rollers 3s, 3A, 3-13d so that they overlap by an appropriate amount as shown in FIG. In the one shown, left and right rollers 3
The roll widths of the rolls g and 3d are configured to be smaller than those of the upper and lower rollers 3a and 3M, and the upper and lower rollers 3 as 3 h are matched with the left and right rollers 3 as 3 d by a width of 2XI'.

In any case, the present invention consists of a set of four facing rollers, one or more of the four rollers is a driving roller, and the reduction rate of the area is set appropriately in sequence. stomach,
These roller groups are sequentially controlled to increase the rolling speed according to the reduction rI [l rate, so that the elastic material becomes the target wire diameter f
Since we adopted a method of continuous rolling in stages, the following characteristics can be obtained.

q) The intermediate winding process that was essential in the conventional wire drawing method using a drawing die is no longer necessary, which allows for extremely good workability and the ability to easily downsize the equipment. The driving force can be reduced.

■ In addition, the present invention performs plastic processing that reduces the cross-sectional area by compressing the wire drawing material from all four sides using four opposing rollers instead of pulling it out, so it can be used for a wide range of applications, including difficult-to-draw wire materials with poor tensile strength. The material can be made into thin wire.

(2) Furthermore, in the present invention, since the wire drawing material is rolled from four sides using a set of four narrow width rolls facing each other, a large reduction in area can be achieved, and therefore the processing speed is very high and production can be performed with high efficiency. In addition, it is difficult to cause fringing, and the desired wire diameter can be adjusted by simply bringing the four opposing rolls closer together, making it easy to obtain fine wire with good shape and size.

According to the present invention as described above, it is possible to produce fine maple wire having a desired size extremely easily and efficiently, and it is possible to obtain excellent effects such as being able to significantly reduce manufacturing costs.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the principle 1 of the metal wire manufacturing method according to the present invention, Fig. 2 is a side view thereof, Fig. 3 is a side view showing an embodiment of the present invention, and Fig. 4 is a third The figure is a partial sectional view, and FIG. 5 is a front view showing the weir of the rolling roller in the present invention. 1.--Wire drawing material, 2-.. Thin wire, 3a... Upper roller,
3k...lower roller, 3C...left roller, 3d...
Right roller, R1 to R0...Roller group. T...Motor. Patent applicant Yoshitomo Tezuka

Claims (2)

[Claims] (1) Fine JI wire drawing material obtained by rolling an ingot
In performing K processing, a group of four opposing rollers is used, and at least one of the rollers is a driving roller, and the drawing material is passed through the roller group and rolled from four sides, 1. A method for manufacturing a thin metal wire, which comprises continuously rolling a wire to a predetermined wire diameter by driving and controlling a group of rollers so as to increase the rolling speed in accordance with the area reduction rate. (2) The method for manufacturing fine wire according to claim 1, in which each set of rollers includes an overlapping portion between the upper and lower rollers and the horizontal roller.