JPS58208031A - Method and apparatus for producing wire with undulatory cover - Google Patents

Abstract

PURPOSE:To effectively obtain good-quality wires with undulatory covers by a method in which a wire is supplied to a coiled wire molding machine to form a coiled wire and the coiled wire is supplied to an extrusion covering device having a specific structure of extrusion cross head to cover the coiled wire with a resin. CONSTITUTION:A wire is supplied to a coiled wire molding machine, where a coiled wire is molded molding rollers 33. Then the coiled wire is supplied to an extrusion covering device 4 having a hollow columnar nipple holder 41 with a pathway 41A for an undulatory covered wire 11, a nipple 42 with a wire guide cylinder 43 turning adjustably according to the shape of the wire 11 and supported at the end of the nipple holder 41, and die 44 with an extrusion hole 44A formed on the circumference line of coiled wire of a diameter, in which a resin flow path 46 is formed on the outside of the nipple 42 and the point corresponding to the center axial line of the coiled wire 11 is centered. Then, the coiled wire 11 is covered with resin to obtain a desired undulatory covered wire 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for manufacturing a helical coated wire, and more specifically to a method and apparatus for manufacturing a helical metal wire with an extruded seed layer. The so-called "Breformed Armor Rod", which is formed into a sand-like shape and is plated or coated with an external coating for rust prevention, is commonly referred to as a "Breformed Armor Rod". Armor rod is conventionally
A straight metal wire is coated by extrusion using an extruder, and this is once wrapped tightly around a cylindrical body, and then removed from the cylindrical body. They were then manufactured by cutting them into regular lengths.

1st L71ε and a? Figure 2 shows this corrugated coated wire 1, with an extruded coating 12 applied to the outside of the wire 11, where p indicates the pitch and D indicates the diameter of the helical wire.

In such conventional methods, once the cylindrical body is formed densely, the forming accuracy is low, and as a result, the metal wire elastically yields, causing problems when used as a broken armor rod. Furthermore, there is a drawback that the outer coating may be damaged.

The present invention has been made to eliminate the drawbacks of such conventional methods, and one m-sequence of the present invention will be explained below.

Fig. 8 shows an example of a complicated method for carrying out the method of the present invention, but the biggest feature of the method of the present invention is that the straight rudder, which was conventionally associated with a non-OT rudder, as will be explained in detail later. This is a process of directly extruding and coating so-called wavy wire rods, which are not shaped like helical wires. In FIG. 2, the part indicated by 2 as a whole is a metal wire feeding device, and the wire drawn out from this device is sent to a helical wire forming device 3 immediately downstream to form a helical wire having a desired diameter and pitch. □゛1: The wire is formed as a so-called corrugated composite material 11. The corrugated wire 11 thus formed is sent to an extrusion coating device 4 having an extrusion crosshead, which is a characteristic feature of the present invention, as will be described later, where an extrusion coating is applied while maintaining the shape of the helical wire.

In this way, the extrusion coating is formed in the extrusion coating device 4, and the wire produced as the corrugated coated wire 1 is sent to the cooling water tank 5 immediately downstream, where it is cooled and the extrusion coating is fixed. Next, if necessary, it is cut to a desired length by a cutting device t6 immediately downstream.

As already mentioned, it has conventionally been considered impossible to apply an extrusion coating to a corrugated wire, but this problem has been solved in the present invention as described below. First, in FIG. 4, the extrusion coating device 4 and the helical wire forming device 3 of an apparatus according to an embodiment of the present invention are enlarged and explained.

The extrusion coating device d4 is fixed to the common base 40, and the base 31 of the helical wire forming device 3 is provided so as to be movable in the length direction with respect to the common base 40 by an adjustment procedure, for example, a feed screw 32. . Since the helical wire forming device 13 is a known device equipped with a large number of forming roller pairs 33, its construction will not be discussed further in this specification. However, since this helical wire forming apparatus 3 employs a continuous forming method, the corrugated wire 11 sent downstream from here is sent out according to the shape of the helical wire. In other words, while rotating around the central axis of the helical wire, the helical wire is fed out so as to advance by one pitch in the axial direction per rotation and introduced into the extrusion coating device 4.

The feature of the extrusion coating device 4 of this inventive device lies in the configuration of the extrusion crosshead, which will be described in detail below. That is, the nipple holder 41, which has a hollow cylindrical shape as a whole and whose hollow part serves as the corrugated wire passage 41A, is arranged coaxially with the corrugated wire 11 sent out from the upstream helical wire forming device 3. A generally disc-shaped nipple 42 is attached to the downstream end of the nipple holder 41 .

A hollow cylindrical linear guide tube 4 is provided at the end of the nipple 42.
3 is rotatably supported. One end of the linear guide cylinder 43 becomes a spherical cylinder base 43, which is rotatably supported by the corresponding spherical rotation support part 42A of the nipple 42, so that the linear guide and the axial direction of the inner cylinder 43 can be rotated considerably. You have the freedom to choose.

A die 44 provided to partition the resin flow path 46 between the nipple 422 and the nipple holders 41 and 044 has a generally disc shape, and an extrusion hole 44A is formed in a part of the die 44 .

The position of this extrusion hole 44A is centered at the point O where the center axis XX of the corrugated wire 11 introduced intersects with the surface of the die 44 as shown in FIG. It is formed on a circumference with a diameter of . Theoretically, it can be anywhere on this circumference, but in practice, taking into account the flow 1 of the molten resin, it is molded at a lower position, point q in Figure 5. is preferable.

Next, with reference to FIG. 5, a description will be given of how a coating is extruded onto the helical corrugated wire 11 using the extrusion coating apparatus 4 of the present invention.

The side view of the corrugated wire 11 viewed from the direction perpendicular to the plane containing the central axis Xx is the same from any angle.
As shown in the figure, the curve Q⇠S... is assumed, but now let's assume that point Q is the bottom dead center in this Figure 5, and align the position of this bottom dead center Q with the extrusion hole 44A. Suppose that

If the corrugated wire rod 11 were to advance parallel to the left in this state, the corrugated wire rod 11 would of course collide with the die 44.

Assuming that there is no obstacle at 1k of die 44 and there is a screen that can be passed through, the corrugated wire 11
1/2 from the Q point. Point R upstream by a pitch will pass through R on the virtual screen, and point T upstream by 1/4 pitch from point Q will pass through T on the screen depending on whether the spiral line winds right or left. ' point or T' point. Furthermore, if the point S upstream from point Q is returned to its original position by one pitch, it will become 1 on this corrugated wire 11.
The points contained within the pitch will travel around the screen one after the other, counterclockwise or clockwise, in a circular manner. Therefore, if we now move the corrugated wire 11 to the left in Fig. 5 while rotating it in the helical direction at a rate of 360 degrees per pitch, then the bottom dead center Q at each rotation angle position (of course This point is a point that moves for a long time on the corrugated wire 11 and is not fixed) always coincides with the extrusion hole 44A of the die 44, and the tangent QY at the Q point is the central axis of the extrusion hole 44A. can be matched. In other words, this means that the molten resin can be extruded from the extrusion hole 44A around the bottom dead center Q of the corrugated wire 11 to form a coating.

In the extrusion coating device #4 of the present invention, as described above, the corrugated wire 11 supplied there must be rotated about the central axis and advanced one pitch per rotation.

Therefore, this shows that the device of the present invention combined with the helical wire forming device f3 that continuously forms the helical wire is extremely rational.

However, in this case, it is necessary to align the bottom dead center Q of the helical wire 11 with the extrusion hole 44A of the die 44, and for this purpose, the distance between the helical wire forming device d3 and the extrusion coating device f4 must be adjusted. It needs to be adjustable. The moving mechanism of the helical wire forming apparatus 3 according to the adjustment procedure 32 described above precisely satisfies this requirement.

During the extrusion coating operation in the extrusion hole 44A of the die 44, care must be taken to ensure that the corrugated wire 11 does not move or vibrate due to the pressure of the molten resin, resulting in uneven thickness. If the wire rod 11 is not fed into a position with a constant Hr and held movably, fl, etc. will occur.

The linear guide tube 43 provided on the nipple 42i plays exactly this holding role, and for this reason, the linear guide tube 43 is provided with the nipple 42i.
originally exhibits a three-dimensional curved shape that matches the helix angle α, helix diameter, pitch, winding direction, etc. of the corrugated wire 11.

According to this invention, as mentioned above, the development of a new extruded cloth/rad has made it possible to extrude and coat corrugated wire as it is, which dramatically increases the manufacturing capacity of corrugated coated wire and improves quality. There is an advantage of being able to obtain a quality breformed armor rod at a low cost.

[Brief explanation of drawings]

Fig. 1 is a side view showing an example of a corrugated coated wire, Fig. 2 is a cross-sectional view taken along line 1 in Fig. 1, and Fig. 8 is a simplified side view showing the entire device of an embodiment of the present invention. , FIG. 4 is an enlarged side view of the helical wire forming device and the extrusion coating device, and FIG. 5 is a diagram for explaining the operating principle of the extrusion coating device of the present invention. ... Corrugated coated wire, 11 ... Corrugated wire, 2 ...
・Feeding device t13... spiral wire forming device, 4...
・Extrusion wave Wit-+t, 5... Cooling water tank, 41...
Nipple holder, 42...Nipple, 43...String guide tube, 44...Die, 44 person Extrusion hole Mamoru Takeuchi, Patent Attorney, Asahito Fujisa Electric Cable Co., Ltd.

Claims (1)

[Claims] ill (a) A step of sending out the wire from the sending device t(2) and forming it into a helical wire shape; ) into the extrusion coating equipment fit1 (4) while rotating and extruding the coating around this corrugated wire; G/C cooling the extrusion coated corrugated wire; A method for manufacturing a corrugated coated wire, comprising: a step of cutting a wire into a certain length; (2) A hollow cylindrical nipple holder (41) with a channel (41A) of corrugated edge material, supported by the end of this nipple holder, and rotationally adjusted according to the shape of the corrugated wire. A nipple (4) equipped with a linear guide tube (43)
2), a resin flow path (46) is defined on the outside of the nipple, and a helical wire diameter circle (45) whose center is a point corresponding to the central axis of the corrugated wire and whose diameter is the diameter of the point corresponding to the central axis of the corrugated wire. An apparatus for manufacturing a corrugated coated wire, comprising an extrusion coating device #(4) having a die (44) having extrusion holes (44A) formed on the circumference. , (3) a hollow cylindrical nipple holder (41) provided with a passageway (41A) for the corrugated wire; and a nipple holder (41) supported by the end of the nipple holder, which is rotatably adjusted in accordance with the shape of the corrugated wire. a nipple (42) provided with a linear guide tube (43) that can
A helical wire diameter circle' (45
) with extrusion holes (44A) formed on the circumference of the die (44
) and an extrusion coating device (4) having an extrusion coating device (4), as well as a helical wire forming 'AI pipe (3) provided upstream of this extrusion coating device and provided so as to adjust the distance to this extrusion coating device
):
t.