JPS58135718A - Method and apparatus for drawing of wire by skin pass - Google Patents

Abstract

PURPOSE:To make a draft of a wire constant in case of skin pass wire drawing, and to maintain constant strength for the finished diameter, by holding rolling force of a horizontal roll and a vertical roll of a roll die, in a constant state, and executing the rolling. CONSTITUTION:In a roll die of a wire draw-working device, an upper roll 5 and a lower roll 6 of a horizontal roll group are held by housings 3, 4 through roll shafts 7, 8, respectively. Respective one ends of the housings 3, 4 are coupled so as to be freely openable and closable by a hinge 9, and the other ends are coupled by a connecting bolt 10. This connecting bolt 10 is clamped by an adjusting nut 13 through a spring 12, and constant rolling pressure is given between the upper and lower rolls 5, 6. In this regard, a vertical roll is constituted in the same way. In this way, even if the wire diameter is varied in case of annealing, a prescribed rolling draft can be given to a wire, and after skin pass wire drawing, a half hard material having prescribed strength can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to composite wires such as gold wires made of copper, aluminum or alloys thereof, copper or aluminum coated iron (steel) wires, or wires plated with different metals on the surface of these wires. The present invention relates to a method for manufacturing a semi-rigid wire material, and provides a method that is particularly effective for wires having a relatively small diameter and a circular cross section.

The wire is usually drawn from a large diameter to a small diameter using a wire drawing die. The finished diameter is full! Wires that require 'er are left as they are drawn, while finished wires that require high quality are annealed after being drawn.

However, those whose tensile strength is intermediate between hard and soft (hereinafter referred to as semi-hard) are produced by annealing with a wire diameter slightly thicker than 1, and then drawing the wire to the finished diameter. Ru.

In this case, the tensile strength of the semi-hard material is determined by the working degree R after annealing obtained by the following equation.

R (%) = (1 (79) 2) × 100 - ...
・・・・・・・・・(1) Tatami 1 no = Finished diameter 10 α = Annealed diameter.

Therefore, it is important to accurately maintain α in equation (1) in order to maintain uniform properties of the semi-rigid wire.

However, this α becomes extremely small as D becomes small. For example, in the case of a working degree of 10%, comparing the cases where D is 5 and 0.5 are as follows.

When D = 5 MM α = 0.270ggD = 0.5
For fins oj = 0.027 In other words, as the finished diameter becomes smaller, α also becomes smaller, and it is necessary to precisely control the wire diameter and finished diameter during annealing.

However, it is extremely difficult to always maintain the diameter of each die hole at a certain target value when considering the wear of the die hole diameter and the manufacturing accuracy of the die.

Therefore, in reality, it was necessary to prepare various finishing dies that matched the actual diameter at the time of annealing, and to replace the finishing dies each time, or to select wires that matched the diameter of the finished die hole. was an extremely troublesome problem.

The present invention was made to solve the above-mentioned problems, and
Even if there are variations in the wire diameter during annealing, the degree of processing of the wire after annealing is always constant, and the strength at the finished diameter can be maintained constant. A skin-pass wire drawing method and its addition] [Equipment] We aim to provide the following.

The first invention of the present invention provides a skin pass fil' 1 after annealing.
In a method of manufacturing a semi-rigid circular wire by applying
A roller die with horizontal rolls and iJ71 (+ rolls) arranged in series was used as the wire drawing device, and the rolling pressure of the horizontal rolls and vertical rolls were adjusted to the same skin pass wire drawing method.

The second invention of the present invention is a system in which one end of two housings each holding a roll on one side is connected by a hinge, and the other end is tightened by a connecting rod to obtain pressure force. A roller die for skin-pass drawing of wire, characterized in that, in the roller dies arranged in rows, springs or cylinders are provided in each row of the dies to adjust the rolling pressure due to tightening to a predetermined value. .

The wire manufactured according to the present invention has a strength intermediate between the hard and soft metal wires, composite wires, and plated wires (semi-hard materials).

Roller dies are usually arranged in series, with two horizontal rolls 1 and two vertical rolls 2 as a set, as shown in FIG. It is rolled in a mold, and as the cross-sectional shape is shown below, it is round →
Oval → Processed into a circle. Since such roller dies are a type of rolling equipment, conventionally, the roll gap was kept constant, that is, the hole shape was kept constant, and even if the wire diameter fluctuated during annealing, it was possible to produce a wire with a constant finished diameter. However, this method had the same drawbacks as the wire drawing die described above.

In the present invention, rolling is performed by keeping the rolling pressure (rolling blade) of each of the horizontal rolls and the vertical rolls constant.

Generally, the relationship between the rolling degree R and the rolling pressure P is mainly expressed by the following formula.

P = f (rl, nR/DW, R, p) ・
・・・・・・・・・・・・・・・・・・(2) However, rI
: Deformation resistance of material DR = Roll diameter DW = Wire diameter during annealing RI: Rolling degree p: Friction coefficient between roll and wire.

Here, when the same material, the same roll, the same wire diameter, and the same rolling lubricant are used, that is, r 1 in equation (2),
When DR/DW and p are kept constant, P is expressed by the following equation.

P=f(R,) ・・・・・・・・・・・・・・・・・・
・(3) Therefore, according to the present invention, if the rolling pressure P of each roll of the roller die is maintained at a constant predetermined value, even if the wire diameter during annealing changes somewhat, a constant rolling degree R1 can be maintained at all times. The strength of the wire at the finished diameter can be maintained at a constant predetermined value.
There is an effect that a semi-hard material having a uniform predetermined strength can be obtained.

In addition, the ratio DR/DW of the roll diameter and the wire diameter during annealing actually changes when the wire diameter Dw changes, but this change in Dw is small (for example, 0.01 to 0.1%) with respect to Dw, DR/
The variation in /Dw is so small that it can be virtually ignored.

FIG. 2 is a side view showing an example of a horizontal roll in an embodiment of the roller die of the present invention. Note that the structure of the vertical rolls is also exactly the same.

In the figure, 3 is an upper housing that holds the upper roll 5 via a roll shaft 7, and 4 is a lower housing that holds the lower roll 6 via a roll shaft 8'. One ends of the housings 3 and 4 are connected to each other by a hinge 9 so as to be openable and closable, and the other ends of the housings 3 and 4 are connected to each other by a connecting bolt IO (connecting rod).

The lower end of the connecting bolt 10 is fixed to the other end of the lower housing 4 by screwing, passes through a through hole 11 in the upper housing 3, and is tightened with an adjustment nut 13 via a spring 12. By adjusting this adjusting nut 13, it is possible to provide a constant rolling pressure between the upper and lower rolls 5.6.

In this case, if the rolling pressure is set to the pressure necessary to give the wire a predetermined rolling degree, even if the wire diameter during annealing varies, it is possible to give the wire a constant rolling degree of 19r. Skin bath wire drawing has the effect of making it possible to obtain a semi-hard material having a predetermined strength.

FIG. 3 is a side view showing a horizontal roll in another embodiment of the roller die of the present invention. Note that the structure of the vertical rolls is also exactly the same. In the figure, the same reference numerals as in FIG. 2 indicate the same parts.

The difference in FIG. 3 from FIG. 2 is the connection rod 4. The lower end of the connecting rod 14 is fixed to the other end of the lower housing 4 by screwing, and the connecting rod 14 is connected to the through hole 11 of the upper housing 3.
The upper end thereof is bent at 90° and connected to the other end of the upper housing 8 via a hydraulic or air cylinder 15 . In this case, the rolling pressure between IJ-rules 5 and 6 can be changed by changing the oil pressure or air pressure of the cylinder 15. effect can be obtained.

As described above, the method of the present invention uses a roller die as a wire drawing device in a method of manufacturing a semi-rigid circular wire by subjecting it to Sginbath wire drawing after annealing, and the rolling pressure of the horizontal roll and the vertical roll is are maintained at a constant predetermined value, so even if the wire diameter changes during annealing, the degree of processing is always constant, so the strength of the wire at the finished diameter can be maintained at a constant predetermined value, resulting in a uniform This has the advantage that a semi-rigid wire having a predetermined strength can be easily manufactured.

In addition, the roller die of the present invention is a roller die in which one end of two housings each holding a roll on one side is connected by a hinge, and the other end is connected to a connecting rod (the connecting rod is tightened to obtain a rolling edge). Since the rod is provided with a spring or cylinder that adjusts the rolling pressure due to tightening to a predetermined value, a constant rolling pressure is always applied to the wire between the rolls, so it has the same effect as the invention of the method described above, and this method The present invention provides an optimal roller die structure for carrying out the invention.

Father: The roller die of the present invention is easy to install because it only requires attaching a spring or cylinder T to the connecting rod.
In addition, even if the wire diameter changes during annealing, wire drawing can be performed without adjustment, so the work is easy and there is no need for conventional management of hole shape, die hole diameter, etc. There is. The present invention is particularly effective for manufacturing wires of relatively small diameter, which conventionally required precise control of diameter and finished diameter during annealing.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of a roller die. FIGS. 2 and 3 are side views each showing an example of a horizontal roll in an embodiment of the roller die of the present invention. l...Horizontal roll, 2...Vertical roll, 3...Tsuchibe housing, 4...Lower housing, 5...Upper roll, 6...Lower roll, 7.8...Roll Axis, 9・
... Hinn, 10 ... Connection bolt, 11 ... Through hole, 12 ... Spring, 13 ... Adjustment nut, 14 ... Connection rod, 15 ... Hydraulic pressure or air / cylinder - 1W ...・
wire. Yoshi 1 diagram 1 Sho 2 diagram Yoshi 3 diagram

Claims (2)

[Claims] (1) In a method of manufacturing a semi-rigid circular wire by subjecting it to skin bath wire drawing after annealing, a roller die in which a horizontal roll and a vertical roll are arranged in series is used as a wire drawing device, and A skin bath wire drawing method for wire, characterized in that a semi-rigid material having a uniform predetermined strength is obtained by maintaining the rolling pressure at a constant predetermined value. (2) In a roller die in which a horizontal roll and a vertical roll are arranged in series, one end of two housings each holding a roll on one side is joined by a hinge, and the other end is tightened by a connecting rod to obtain a rolling blade. A roller die for skin-bath drawing of wire, characterized in that the connecting rod is provided with a spring or a spool for adjusting the rolling pressure by tightening to a predetermined value.