JPH06198371A - Manufacture of spiral wire and product thereof - Google Patents

Abstract

PURPOSE:To provide the manufacture of a spiral wire having a spiral groove simply and at low cost as well as a product thereof without performing any process such as cutting and grooving on a wire rod as a primary product constituted of a metallic round wire rod. CONSTITUTION:By forming the round wire into a polygonal wire by a polygonal die and by twisting and drawing the polygonal wire, the polygonal faces are changed into spiral grooves 2; and by further roll forming and drawing, a spiral wire rod like the spiral wire 1' though it is in a shape close to a round wire is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a product for manufacturing a spiral wire rod having improved elasticity, frictional force and strength, particularly strength against pulling and twisting.

[0002]

2. Description of the Related Art A wire rod as a primary product made of a metal round bar is made into a product by drawing it out by a blast furnace or an electric furnace and performing a wire drawing process, and is not yet in a state shipped from a maker. Since the composition is rough, various treatments are generally performed in the processing stage of secondary products such as bolts, wires, chains and the like.

[0003]

However, since wire rods or wires as primary products are mostly round wires having a round cross section, there is a problem in terms of lack of frictional force and elasticity and strength.

The present invention has been made in view of the above problems of the prior art. The object of the present invention is to improve the elasticity, frictional force, and particularly torsional strength of a wire rod as a primary product. The present invention aims to provide a spiral wire rod and a manufacturing method thereof that can be used for various purposes.

[0005]

In order to achieve the above object, the method for producing a spiral wire rod according to the present invention is such that a wire rod made of a metal round wire as a primary product is forcedly passed through a polygonal die and simultaneously stretched. After the first step of forming a polygonal wire into a twisted wire, the polygonal wire is supplied to a rolling die to be twisted while being drawn at the same time as the diameter reduction, and the twisted wire is further formed. A step of forming a shallow spiral groove that is continuous in the entire length in the longitudinal direction by supplying the second and third rolled round dies and performing secondary or tertiary stretching. To do.

Then, the twisted wire obtained in the second or third step is reversely supplied to a rolled round die and further stretched to cross over the spiral groove in the opposite direction. There is a method of forming into a shape.

Furthermore, a wire rod as a primary product made of a round metal wire is made into a polygonal line, and the polygonal line is further stretched and twisted to form a shallow spiral groove continuous in the entire length in the longitudinal direction to obtain a product. preferable.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the method of the present invention will be described with reference to the drawings.

As the wire rod 1 as a primary product, a metal round wire is used.

The material is a metal such as stainless steel, iron, aluminum or copper, or a non-ferrous metal.

The polygon die 10 has square, hexagonal, or octagonal through-holes.

The rolling dies 11 and 12 are generally used in wire drawing materials, and are drawn while passing a wire material having a larger cross section through a die hole while applying drawing.

[0013]

As shown in FIG. 1, in the first step, the metal wire 1 made of a round wire has a circular cross section and its cross-sectional area is uniform. First, the wire W is forced onto the polygonal die 10. And press it into the outlet 10b side from the inlet 10a side. The polygonal line 1 is formed by passing through the die hole of the polygonal die 10. When the wire material W becomes the polygonal wire 1, the drawing area is applied and simultaneously stretched, so that the cross-sectional area becomes small. By the drawing and stretching of the polygonal molding, the composition density of the wire is increased and the strength is increased.

In the second step, when the polygonal wire 1 obtained in the first step is supplied to the rolling die 11 and stretched at the same time as the diameter reduction and twisted by rotation, a polygonal surface is formed as shown in FIG. Becomes a twisted wire rod 1 ′ having a spiral groove 2.

Furthermore, when the twisted wire 1'obtained in the second step is supplied to the rolled round die 12 in the third step shown in FIG. 3 to carry out the secondary or tertiary drawing, the surface of the wire is It is flattened and becomes flat, and the spiral groove 2 in the second step is further flattened and becomes shallower. Since the drawing and drawing are applied in the second and third steps, the composition density of the wire is further increased.

FIG. 5 shows a spiral wire rod S formed through the above first to third steps. This spiral wire rod S is formed into a round rolling die again after the second step or the third step. When it is supplied in the opposite direction and further stretched while being rotated, a spiral groove 2'in the opposite direction is formed in a cross shape on the spiral groove 2 as shown in FIG.

The width and depth of the spiral grooves 2.2 'can be adjusted by adjusting the number of corners of the polygon and the pitch of the twist.

Further, the wire rod may have a unit length, or a continuous long wire can be obtained as a spiral wire rod from a polygonal wire.

[0019]

As described above, according to the present invention, a metal wire made of a round wire is passed through a polygonal die to be stretched to form a polygonal line such as a quadrangle or a hexagon, and this polygonal line is further stretched simultaneously with twisting. By forming a twisted wire rod, a spiral groove with a polygonal surface is formed on the peripheral surface of the wire rod, and this is stretched by the second and third rolling dies to draw the surface smoothly. It is possible to easily and surely provide a spiral wire rod having a shallow groove width and a spiral groove of a full length,
Since the so-called loose spring effect is exerted by twisting, not only the elastic strength is increased, but also the strength against tension and bending is remarkably increased, and the formation of the spiral groove increases the frictional force as compared with a normal round wire. Therefore, it is expected to be applied to products in which slippage is a problem, and it has excellent effects such as easy molding and being inexpensive as a product.

[Brief description of drawings]

FIG. 1 is a diagram showing a first step of the method of the present invention.

FIG. 2 is a diagram showing a second step of the method of the present invention.

FIG. 3 is a diagram showing a third step of the method of the present invention.

FIG. 4 is a cross-sectional view of each wire showing a state of changing from a round wire to a square wire and a twisted wire.

FIG. 5 is a side view showing a part of a spiral wire rod manufactured by the method of the present invention.

FIG. 6 is a side view of a part of the spiral wire rod when the spiral grooves are formed in a cross shape.

[Explanation of symbols]

 1 Polygonal wire 1'Twisted wire rod 2.2 'Spiral groove 10 Polygonal die 11/12 Rolling die W Round wire rod S / S' Helical wire rod

Claims (3)

[Claims] 1. A wire rod as a primary product made of a round metal wire is forcibly passed through a polygonal die and at the same time stretched to form a polygonal wire. After the first step, the polygonal wire is supplied to a rolling die. Then, the second step of forming a twisted wire rod by applying a twist while stretching at the same time as reducing the diameter and further supplying this twisted wire rod to the second and third rolled round dies to carry out the secondary or tertiary stretching. And the step of forming a shallow spiral groove that is continuous along the entire length in the longitudinal direction by performing the above step. 2. The reverse spiral groove is formed in an intersecting manner on the spiral groove by supplying the twisted wire rod in a reverse direction to a rolled round die and further stretching it. The method of claim 1. 3. A wire rod as a primary product made of a round metal wire is made into a polygonal line, and the polygonal line is further stretched and twisted to form a shallow spiral groove continuous in the entire length in the longitudinal direction. A spiral wire rod.