JP2016107336A - Corrugated wire and corrugated wire manufacturing device and manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire net corrugated wire capable of suppressing the out-of-plane deformation of the wire net, and corrugated wire manufacturing device and method.SOLUTION: A pair of upper and lower rolls 11 has a plurality of recessed holes 13 arrayed in the circumferential direction of an outer peripheral plane and slender in the circumferential direction, a vertical sectional shape at its width-direction center position has a recessed bent shape gradually shallower from a depth substantially equal to a wire material diameter at the circumferential middle part of the recessed hole toward both ends in the circumferential direction, a boundary part between the recessed hole and a roll outer peripheral part 11a has a projected bent shape projected outward in a radial direction to be smoothly continuous to the roll outer peripheral surface, and a roll outer peripheral surface part between the adjacent recessed holes constitutes a projected part 15 in which roll bent shape parts 14 are both shoulder parts. The cross sectional shape of the recessed hole is deepest at the width-direction center position and shallower toward width-direction both ends. A roll rotation driving mechanism 16 rotary-drives both rolls in a state where roll outer peripheral surfaces contact with or approach each other at a small gap and a state where the recessed hole of one of the rolls faces the projected part of the other roll.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a corrugated wire for a wire mesh used in a wire mesh formed by knitting a vertical wire and a horizontal wire, and a manufacturing apparatus and a manufacturing method for manufacturing the corrugated wire.

In a so-called crimped wire mesh formed by knitting vertical and horizontal wire rods, which are corrugated wire rods, the intersections between the vertical wire rods and the horizontal wire rods are merely closely engaged with each other in the corrugated shape. There is a degree of freedom in shape. Therefore, for example, in the case of a fence made of crimped wire mesh, the entire fence can be inclined into a parallelogram by making in-plane deformation so that the quadrilateral mesh of the crimped wire mesh becomes a parallelogram mesh, and installed on an inclined land This is extremely convenient.
However, the large degree of freedom of the mesh shape is likely to cause problems such as unstable mesh shape and out-of-plane deformation (deformation in a direction perpendicular to the wire mesh surface (deformation that is no longer a metal mesh surface plane)). It becomes the problem that it is difficult to handle at the time of transportation and construction.

Patent Document 1 is a crimped wire mesh (mesh panel) that secures the degree of freedom of the mesh shape as described above to a necessary level and prevents it from being unnecessarily deformed, and is flat at each intersection of a vertical wire and a horizontal wire. A surface is formed, and the vertical wire and the horizontal wire are engaged with each other by surface contact, thereby suppressing the out-of-plane deformation of the crimp wire mesh and improving the shape stability, and transporting and installing the crimp wire mesh. It is possible to make it easier. Moreover, it can prevent that the engagement state cancellation | release of the crossing part by the vertical wire or horizontal wire itself rotating arises. In addition, there is a moderate resistance at the intersection between the vertical and horizontal wires, so it is possible to adjust the square mesh to a parallelogram by applying force by hand and install it on an inclined ground. It is effective when.
In Patent Document 1, press molding is employed as means for forming a corrugated wire (vertical or horizontal wire) having a flat surface.

Corrugated wire rods (vertical wire rods and horizontal wire rods) used for crimped wire mesh are generally manufactured by passing a material wire between a pair of upper and lower gears.
In Patent Document 2, a material wire is passed between upper and lower gears to form a corrugated wire having a flat portion. However, in the conventional method of manufacturing a corrugated wire using upper and lower gears, a polygonal wire or an elliptical wire is used. In the case of molding, etc., what is impossible to mold due to twisting or falling is made moldable.
Specifically, by forming concave grooves on the tops of the tops of the teeth of the upper and lower gears and molding the material wire through the concave grooves, a flat part having a slip stopper groove in the thickness direction is provided at the bottom of the teeth. Thus, twisting and falling are prevented from occurring. In addition, the corrugated wire which patent document 2 is going to shape | mold is a corrugated wire which has a flat part in the front-end | tip (convex surface side of a convex part) of a corrugated convex part instead of the concave surface side of a corrugated convex part.
Further, in Patent Document 2, both vertical and horizontal are not corrugated wires, but one is a corrugated wire (corrugated metal wire 10) and the other is a straight wire (connecting rod 26). .

JP 2014-159706 A JP 6-81651

  In Patent Document 1, the means for forming the flat portion on the concave surface side of the convex portion of the corrugated wire is press molding. However, if such a flat portion can be formed by a rotating roll, the corrugated wire with the flat portion is more efficient. Therefore, a means that can be formed by a rotating roll is desired.

Moreover, although patent document 2 becomes a reference once at the point of forming a flat part in a corrugated wire, a flat part is not on the concave surface side of the convex part of a corrugated wire, but on the front-end | tip (convex surface side of a convex part). Since it forms, it is not effective with respect to the subject of this invention of suppressing the out-of-plane deformation of a wire mesh.
In forming with a gear, even if an attempt is made to form a flat portion only on the concave surface side of the convex portion of the corrugated wire rod, a flat portion is also formed on the convex surface side of the convex portion. In some cases, a normal convex shape that is not flat is desired on the convex surface side of the convex portion in appearance, and it is not possible to cope with it. Moreover, in the tooth profile of a normal gear, it is difficult to form a flat portion effective for appropriately suppressing out-of-plane deformation of the wire mesh on the concave surface side of the convex portion of the corrugated wire rod at the top of the tooth.
In addition, the method of forming the flat portion at the same time that the material wire is passed between the upper and lower gears and simultaneously forming the flat portion has low shape determinism and cannot ensure a precise shape.
Further, even if the material wire is passed through the concave groove formed at the top of the tooth tip, it is difficult to say that twisting and falling can be sufficiently prevented because the restraining force is small. In addition, the structure in which the anti-slip groove in the thickness direction is provided in the tooth bottom part is control by friction, and it is difficult to say that it is effective for twisting and falling.

  The present invention has been made to eliminate the above-described conventional drawbacks, and is a corrugated wire mesh capable of effectively suppressing out-of-plane deformation in a wire mesh using a corrugated wire having a continuous upward convex portion and a downward convex portion. It aims at providing a wire rod. In addition, it is possible to form a flat portion effective for moderately suppressing out-of-plane deformation of the wire mesh on the concave surface side of the convex portion of the corrugated wire, and the concave side without crushing the convex surface side of the convex portion A corrugated wire manufacturing apparatus capable of forming a flat portion only, ensuring a highly accurate corrugated shape with high shape determinism, and capable of effectively preventing twisting and falling; and An object is to provide a manufacturing method.

Invention of Claim 1 which solves the above-mentioned subject is provided with a pair of upper and lower rolls, and a rotation drive mechanism which rotationally drives the upper and lower rolls,
Each of the pair of upper and lower rolls has a plurality of concave holes elongated in the circumferential direction, both of which are arranged in a row in the circumferential direction on the outer circumferential surface thereof,
The longitudinal cross-sectional shape at the center position in the width direction of the concave hole is a concave curved shape with a large curvature radius that gradually becomes shallower toward both ends in the circumferential direction from the depth of the wire diameter in the middle in the circumferential direction of the concave hole,
The boundary portion between the concave hole and the outer peripheral surface portion of the roll located at both ends in the circumferential direction of the concave hole has a convex curved shape with a small curvature radius convex outward in the radial direction and smoothly continues to the outer peripheral surface of the roll. Then, the roll outer peripheral surface part between adjacent concave holes forms a convex part with the convex curved part as both shoulder parts,
The cross-sectional shape of the concave hole is a cross-sectional shape that becomes deepest at the center position in the width direction and becomes shallower toward both ends in the width direction,
The rotational drive mechanism that rotationally drives the upper and lower rolls is such that the outer peripheral surfaces of the rolls are in contact with each other or in close proximity with a small gap, and the concave hole of one of the rolls and the convex part of the other roll face each other In another embodiment, the corrugated wire manufacturing apparatus is characterized in that both rolls are rotationally driven.

  The invention of claim 2 is a corrugated wire for a wire mesh used for a wire mesh formed by knitting a vertical wire and a horizontal wire, and has a corrugated shape in which an upward convex portion and a downward convex portion are continuous when viewed from the side. , Crushing depressions are formed on both surfaces in the vicinity of the boundary between the upward projection and the downward projection, and the concave surfaces of the upward projection and the downward projection are substantially flat including the depression. It is characterized by.

Claim 3 is a corrugated wire manufacturing apparatus for manufacturing the corrugated wire of claim 2,
A pair of upper and lower rolls, and a rotation drive mechanism for rotating the upper and lower rolls,
Each of the pair of upper and lower rolls has a plurality of elongated recesses in the circumferential direction, each of which is formed in a row at an equal pitch in the circumferential direction on the outer circumferential surface thereof.
The longitudinal cross-sectional shape at the center position in the width direction of the concave hole is a concave curved shape with a large curvature radius that gradually becomes shallower toward both ends in the circumferential direction from the depth of the wire diameter in the middle in the circumferential direction of the concave hole,
The boundary portion between the concave hole and the outer peripheral surface portion of the roll located at both ends in the circumferential direction of the concave hole has a convex curved shape with a small curvature radius convex outward in the radial direction and smoothly continues to the outer peripheral surface of the roll. The roll outer peripheral surface part between adjacent concave holes forms a convex part with both convex curved parts as shoulder parts,
The cross-sectional shape of the concave hole is a cross-sectional shape that becomes deepest at the center position in the width direction and becomes shallower toward both ends in the width direction,
The rotational drive mechanism that rotationally drives the upper and lower rolls is such that the outer peripheral surfaces of the rolls are in contact with each other or in close proximity with a small gap, and the concave hole of one of the rolls and the convex part of the other roll face each other In an embodiment, both rolls are driven to rotate,
A concave hole facing one convex part of one of the rolls and one convex part of the other roll when the material wire is fed between the rotating upper and lower rolls in accordance with the row of concave holes. And the two convex portions on both sides thereof are bent and deformed, and the concave surface on the opposite side of the convex portions is flattened and simultaneously the shoulders of the convex portions on both sides Forming a hollow portion to form a substantially flat portion including the hollow portion due to the crushing on each concave surface side of the upward convex portion and the downward convex portion of the corrugated wire formed from the raw material wire. It is characterized by.
According to a fourth aspect of the present invention, in the corrugated wire manufacturing apparatus according to the third aspect, the contour shape viewed from the top of the concave hole is such that both edges in the width direction of the intermediate portion in the circumferential direction of the concave hole are parallel to each other, It is characterized by having a shape having a bulging portion that swells inside the concave hole in the middle of the squeezed portion, and is connected to both end edges that narrow toward both ends and form a narrow arc shape. To do.

Claim 5 is a corrugated wire manufacturing method for manufacturing the corrugated wire of claim 2,
Using a pair of upper and lower rolls that are driven to rotate,
Each of the rolls has a plurality of circumferentially elongated concave holes on the outer peripheral surface thereof arranged in a row at an equal pitch in the circumferential direction,
The longitudinal cross-sectional shape at the center position in the width direction of the concave hole is a concave curved shape with a large curvature radius that gradually becomes shallower toward both ends in the circumferential direction from the depth of the wire diameter in the middle in the circumferential direction of the concave hole,
The boundary part between the concave hole located at both ends in the circumferential direction of the concave hole and the outer peripheral surface of the roll has a convex curved shape with a small curvature radius convex outward in the radial direction and smoothly continues to the outer peripheral surface of the roll. The roll outer peripheral surface part between adjacent concave holes forms a convex part with the convex curved part as both shoulder parts,
The cross-sectional shape of the concave hole is a cross-sectional shape that becomes deepest at the center position in the width direction and becomes shallower toward both ends in the width direction,
The upper and lower rolls are in a state in which the outer peripheral surfaces of the rolls are in contact with each other or in a small gap, and the concave hole of one of the rolls and the convex part of the other roll face each other. While rotating, aligning the material wire to the row of concave holes, and feeding between the upper and lower rolls,
The material wire is bent and deformed by one convex portion of one of the rolls, the concave hole facing the one convex portion of the other roll, and the two convex portions on both sides thereof, and The concave side of the opposite side of the part is flattened and at the same time the material wire is crushed by the shoulders of the convex parts on both sides to form a hollow part, and the upward corrugation of the corrugated wire formed from the material wire A substantially flat portion including the depression due to the crushing is formed on each concave surface side of the portion and the downward convex portion.

The corrugated wire manufacturing apparatus of the present invention manufactures a corrugated wire through a material wire between a pair of upper and lower rolls, and the upper and lower rolls are arranged in a row in the circumferential direction at equal pitches in the circumferential direction. It has a plurality of elongated concave holes, and the boundary portion between the concave hole and the outer peripheral surface portion of the roll has a convex curved shape with a small curvature radius convex outward in the radial direction, and is smoothly continuously adjacent to the outer peripheral surface of the roll. The roll outer peripheral surface portion between the concave holes is a roll that forms a convex portion having the convex curved portion as both shoulder portions, and the roll rotation drive mechanism that rotationally drives the upper and lower rolls is a mutual roll. Since both the rolls are driven to rotate in a state where the outer peripheral surface is in contact or close to each other with a small gap, and the concave hole of one of the rolls is opposed to the convex part of the other roll,
It is possible to form a substantially flat portion effective for appropriately suppressing out-of-plane deformation of the wire mesh on the concave surface side of the convex portion of the corrugated wire.
In this case, it is possible to flatten the concave side of the convex part of the wire rod by adjusting the roll reduction (gap adjustment between the upper and lower rolls (adjustment to narrow the gap)), and the shoulder of the convex part Thus, a hollow portion can be formed, and a substantially flat portion including the hollow portion can be formed, which is effective for suppressing the out-of-plane deformation of the wire mesh.
Further, since the convex surface side of the corrugated convex portion is formed along the arcuate bottom surface of the concave hole, it is possible to form a flat portion only on the concave surface side without collapsing the convex surface side of the corrugated convex portion. . Therefore, for example, when it is used for a fence or the like, and the convex shape side of the convex portion is desired to have a normal convex shape that is not flat, it can cope with it.

Moreover, in the tooth profile of a normal gear, it is difficult to form a flat portion effective for suppressing the mesh shape deformation or out-of-plane deformation of the wire mesh on the concave surface side of the convex portion of the corrugated wire rod at the top of the tooth. However, as described above, the upper and lower rolls rotate in such a manner that the outer peripheral surfaces of the rolls are in contact with each other or close to each other with a small gap, and the concave hole of one of the rolls and the convex portion of the other roll face each other. Since it is formed through the material wire in between, it is possible to form a flat portion effective for suppressing the mesh shape deformation and out-of-plane deformation of the wire mesh.
In addition, the upper and lower rolls form the raw material wire in a state where the outer peripheral surfaces of the rolls are in contact with each other or with a small gap, and the raw material wire is in a state of being firmly grasped in a groove-like concave hole elongated in the circumferential direction. Since it is molded and sent out, it can be molded without causing twisting or falling.
As described above, since the material wire is molded in a state of being firmly grasped in a groove-like concave hole elongated in the circumferential direction, the corrugated shape with high shape determinism and high accuracy can be ensured.

According to the corrugated wire rod of the present invention, the concave side of each of the upward convex portion and the downward convex portion is made substantially flat in a form having depressions due to crushing on both surfaces near the boundary between the upward convex portion and the downward convex portion. Therefore, in the crimp wire mesh formed by knitting the vertical wire and the horizontal wire using the corrugated wire, it is possible to prevent the mesh shape from being deformed more than necessary while ensuring the degree of freedom of the mesh shape.
That is, the intersection of the vertical wire and the horizontal wire, which is the engagement between the flat portions of the upward convex portion and the downward convex portion, is engaged by surface contact with each other. There is no moderate resistance, and there is no relative rotation between the vertical and horizontal wires, and the mesh shape does not become unstable, and no out-of-plane deformation occurs. Therefore, transportation and other handling of the wire mesh are easy, and there are few problems that it is difficult to construct a fence using the wire mesh.
On the other hand, it is possible to make an adjustment by deforming a square mesh into a parallelogram by applying force by hand, and when applied to a fence, it is effective when installed on an inclined ground.
However, since both ends of the flat part are dents due to crushing, these dents become steps, the limits of relative rotation between the vertical and horizontal wires are clearly determined to some extent, and the wire mesh is useless and has a sharply parallelogram. It is prevented that it becomes.
Also, since the flat part is a flat part having dents due to crushing at both ends, unlike the case where the flat part is formed only by bending deformation, a long flat part is provided in the wave pitch direction even when the wave pitch of the waveform is short. It is possible to have a flat part length as much as necessary to transform the mesh into a parallelogram having a desired angle.

It is a side view of the corrugated wire material of one Example of this invention. It is a principal part enlarged view explaining the detail of the shape of the hollow part in the corrugated wire of FIG. One Example of the corrugated wire manufacturing apparatus which manufactures the said corrugated wire is shown, (A) is a front view, (B) is detailed explanatory drawing of the part of an upper roll and an upper driven helical gear. . 3A is a cross-sectional view taken along the line AA in FIG. 3A (where the base portion is not a cross section), and FIG. 3B is a diagram for explaining the operation of the backlash prevention mechanism of FIG. FIGS. 3A and 3B are diagrams for explaining the operation of the backlash prevention mechanism of FIG. 3B, in which FIG. 3A shows a state in which there is backlash, and FIG. 3B shows a state in which the backlash has been eliminated. The roll part which is the principal part of the corrugated wire manufacturing apparatus of FIG. 3 is shown in the state at the time of corrugated wire manufacture, (A) is a side view, (B) is a front view. It is an enlarged view of the wire processing part in FIG. It is the figure which abbreviate | omitted the wire in FIG. It is a figure explaining the detail of one recessed hole in FIG. 8, (A) is the top view which expanded and showed one recessed hole (The depth is shown with the contour line), (B) is (A) It is a longitudinal cross-sectional view in the width direction center position of the roll corresponding to a BB cross section. It is the figure which showed typically an example of the crimp wire-mesh for fences formed by knitting the vertical wire and horizontal wire by the above-mentioned corrugated wire. It is the perspective view which showed the detail of a part of crimp wire mesh of FIG. FIG. 11 shows one portion of the intersection of the vertical wire and the horizontal wire in the crimp wire mesh of FIG. 11, (a) is a plan view, and (b) shows the upper corrugated wire in (b) without a cross section. It is CC sectional drawing. It is an elevation view of a corrugated wire manufacturing apparatus. It is a top view of a corrugated wire manufacturing apparatus. FIG. 15 is an elevation view of the corrugated wire forming machine as seen in the direction of arrows CC in FIG. (A) is the figure which expanded and showed the detail of the principal part of FIG. 13, (b) is an expanded sectional view of the principal part of (a). It is a figure explaining the effect | action of the shaping | molding stand of the closed structure which provided the stay, (A) is a shaping | molding stand of a general open structure, (B) is a shaping | molding stand of a closed structure. It is a figure explaining the effect | action of the guidance guide which guides a wire to the up-and-down roll of a corrugated wire forming machine.

  Hereinafter, the corrugated wire of the present invention, a manufacturing apparatus for manufacturing the corrugated wire, and a mode for carrying out the manufacturing method will be described with reference to the drawings.

FIG. 1 is a side view of a corrugated wire rod according to an embodiment of the present invention, and FIG. 2 is an enlarged view of a main part of FIG. The corrugated wire 1 is a corrugated wire for a wire mesh used for a wire mesh formed by knitting a circular vertical wire and a horizontal wire, and as shown in FIG. 1, an upward convex portion 2 and a downward convex portion as viewed from the side. 3 has a continuous wave shape, and has depressions 5 due to crushing on both upper and lower surfaces in the vicinity of the boundary between the upward convex part 2 and the downward convex part 3, and the upward convex part 2 and the downward convex part 3 Each concave surface 2a, 3a side is made substantially flat (substantially flat part is shown by 6) including the said recessed part 5. As shown in FIG. The distinction between the upward convex part 2 and the downward convex part 3 is not a substantial distinction but an explanatory distinction, and is reversed when viewed upside down.
In addition, the corrugated wire 1 of an Example is a steel corrugated wire of diameter 4.0mm, wave pitch 20mm, and wave depth 3.6-3.7mm.

  Said corrugated wire 1 can be shape | molded, for example with the corrugated wire forming machine 10 shown in FIG. 3, FIG. 4 which is the core part of the corrugated wire manufacturing apparatus mentioned later. As shown in FIG. 6, the corrugated wire rod forming machine 10 includes a pair of upper and lower rolls 11 (11A, 11B) that are rotationally driven. FIG. 7 is an enlarged view of a main part of FIG. 6 and shows a state where the material wire 1 ′ is formed into the corrugated wire 1 by the concave holes 13 described later of the upper and lower rolls 11, 11. The outer diameter of the roll is 160 mm and the width is 40 mm.

As shown in FIGS. 6 (a) and 6 (b), each of the rolls 11 has, on the outer peripheral surface thereof, a plurality of elongated recesses 13 in the circumferential direction that are arranged in a row at an equal pitch in the circumferential direction.
FIG. 8 is a view obtained by removing the wire 1 from FIG. 7 in order to clearly show a portion of the roll 11 where the wire is formed into a waveform.
FIG. 9 (a) is an enlarged plan view of one concave hole 13, and FIG. 9 (b) is a longitudinal sectional view at the center position in the width direction of the roll, corresponding to the BB section of FIG. 9 (a). .
The contour shape viewed from the top of the concave hole 13 is that both edges in the width direction of the intermediate portion in the circumferential direction of the concave hole are parallel to each other and narrowed toward both ends in the vicinity of both ends in the circumferential direction to form a narrow arc shape It is connected to the edge and has a shape having a bulging portion (inwardly raised portion described later) bulging inside the concave hole in the middle of the narrowing portion.
The longitudinal cross-sectional shape at the center position in the width direction of the concave hole 13 has a large curvature radius that gradually decreases from the depth h slightly shallower than the wire diameter toward the both ends in the circumferential direction at the intermediate position C in the circumferential direction of the concave hole 13. A boundary portion between the concave hole 13 and the roll outer peripheral surface portion 11a, which has a concave curved shape (a concave curved shape portion having a large curvature radius is indicated by 13a) and is located at both ends (E portion) in the circumferential direction of the concave hole 13. However, it has a convex curved shape with a small curvature radius convex outward in the radial direction and smoothly continues to the outer peripheral surface 11a of the roll. The convex curved portion having a small curvature radius convex outward in the radial direction is referred to as a convex curved portion 14.
Thereby, the roll outer peripheral surface portion 11a between adjacent concave holes 13 forms a convex portion 15 having the convex curved shape portion 14 as both shoulder portions. The convex curved shape portion 14 is sometimes referred to as a shoulder portion 14 of the convex shape portion 15.
In the above description, the convex curved shape portion (shoulder portion of the convex portion 15) 14 located at both ends E in the circumferential direction of the concave hole 13 has been described with respect to the longitudinal sectional shape at the center position in the width direction of the concave hole 13. Further, it includes portions on both sides in the width direction from the center position in the width direction of the concave hole 13. In particular, the inwardly raised portions 14a on both sides of the center position in the width direction of the recessed hole 13 have an important effect in forming the recessed portion 5 having an appropriate shape in the wire.
Moreover, the cross-sectional shape of the concave hole 13 is a cross-sectional shape that becomes deepest at the center position in the width direction and becomes shallower toward both ends in the width direction.
The dimensions of the recessed hole 13 of the embodiment are about 16.5 mm in length in the roll circumferential direction, about 4.0 mm in width, and about 3.7 mm in the deepest portion.

  The details of the corrugated wire forming machine 10 will be described with reference to FIGS. 3 (a) and 3 (b). The upper and lower rolls 11 (11A and 11B) are supported by a roll shaft 22 (supported by left and right stand frames 21). 22A, 22B) and a helical gear 23 (23A, 23B) is mounted on the drive source side (left side of FIG. 3 (a)) of the roll shaft 22 (22A, 22B). Reference numeral 24 denotes a spacer.

The roll rotation driving mechanism 16 that rotates the upper and lower rolls 11 is in a state where the roll outer peripheral surfaces 11 a are in contact with each other or close to each other with a small gap, and the concave hole 13 of one of the rolls 11 and the other roll 11. Both rolls 11 are rotationally driven in such a manner that the convex portion 15 of the two faces exactly.
In the embodiment, the gap between the roll outer peripheral surfaces 11a is set to about 0.3 mm (when the wire diameter is about 4.0 mm).

The lower roll shaft 22B is a drive shaft, and the rotational power of the electric motor 25 is transmitted to the lower roll shaft (drive shaft) 22B via the speed reducer 26 and the chain coupling 27, and is fixed to the drive shaft 22B. The helical drive 23B and the lower roll 11B rotate, and the rotation of the driven helical gear 23B is transmitted to the upper roll shaft 22A (driven shaft) and transmitted to the helical gear 23A. 11A rotates. The electric motor 25, the speed reducer 26, the chain coupling 27, the upper and lower roll shafts 22A and 22B, the helical gears 23A and 23B, and the like constitute the roll rotation drive mechanism 16.

In this embodiment, in order to prevent backlash in gear transmission, for example, a backlash prevention mechanism 30 shown in detail in FIG. The embodiment is a translational backlash prevention mechanism. The driven helical gear 23A in the backlash prevention mechanism 30 includes a fixed driven gear 23Aa fixed to the driven shaft 22A and a movable driven gear 23Ab attached to the driven shaft 22A so as to be movable only in the axial direction.
The movable driven gear 23Ab is attached to the fixed driven gear 23Aa by screwing the tip of the headed bolt 31 into the screw hole 32 of the fixed driven gear 23Aa, and the movable driven gear 23Ab is fixed to the fixed driven gear 23Aa at the head of the headed bolt 31. A compression spring 33 that biases to the side is disposed.
When backlash occurs, the movable driven gear 23Ab is automatically slid in the axial direction by the force of the compression spring 33 to eliminate the backlash. Briefly the backlash eliminating action, 5 (a) and (b), _{g 0} is the teeth of the driving helical gear 23B, _{g 1} is the teeth of the fixed driven gear 23Aa, _{g 2} is movable driven gear 23Ab Showing teeth.
As shown in FIG. 5 (a), in the aligned state in which the teeth of the fixed driven gear 23Aa and the movable driven gear Ab are aligned, there is a gap between the driving gear 23B and the driven gear 23A (fixed driven gear 23Aa / movable driven gear 23Ab). Backlash has occurred. When the movable driven gear 23Ab moves parallel to the fixed driven gear 23Aa side by the force of the compression spring 33 that constantly urges the movable driven gear 23Ab to the fixed driven gear 23Aa side from this aligned state, FIG. As shown in (b), the tooth traces of both gears 23Aa and 23Ab are shifted from each other. Since the tooth traces of the two gears 23Aa and 23Ab are shifted from each other, the tooth thickness at the meshing contact point position of the driven gear 23A consisting of the two gears 23Aa and 23Ab is substantially meshed with the driving gear 23B. The groove extends to the groove width W at the point position (substantially the same state as the case where the tooth profile of the driven gear 23A is manufactured with zero backlash in terms of meshing action), and backlash is eliminated.

In the present invention, it is important that the respective flat portions on the concave surface side of the upward convex portion of the corrugated wire and the concave surface side of the downward convex portion become parallel flat surfaces. However, it is important that the shape of the upper and lower rolls 11 (11A, 11B) be backlashed due to backlash, as viewed from the direction perpendicular to the waveform of the wire (that is, the direction in which the wave shape appears straight). If the relative rotation angle is slightly shifted, the positional relationship between the one concave hole 13 and the other convex portion 15 is shifted, and the shape of the hollow portion 5 formed in the wire becomes non-uniform. Not symmetric. Further, if the positional relationship between one concave hole 13 and the other convex portion 15 of the upper and lower rolls 11 is shifted, it also leads to twisting and falling of the wire passing therethrough. May become non-uniform.
Therefore, as in the embodiment, it is significant not only to use a helical gear but also to adopt a helical gear transmission mechanism having a backlash prevention mechanism.

  The diameters of the upper and lower rolls 11A and 11B are the same as the pitch circle diameter of the helical gears 23A and 23B.

  Reference numeral 29 denotes a guide member that guides the material wire between the upper and lower rolls 11, and is a tubular guide member having an inner diameter slightly larger than the diameter of the wire.

When the corrugated wire rod is formed by the corrugated wire rod forming machine 10, the material wire rod is inserted between the upper and lower rolls 11 through the guide member 29. First, the top and bottom rolls 11 may be driven to rotate after guiding the tip of the wire to one of the concave holes 13 immediately below the top and bottom rolls 11.
As shown in FIG. 7, the wire is curved and molded by being pushed into the concave hole 13 side by the convex portion 15, but is slightly in the roll outer peripheral surface portion 11 a near the flat shape of the convex portion 15 when passing under the roll. By being crushed, a substantially flat portion 6 is formed on the concave surfaces 2a and 3a side of the upward or downward convex portions 2 and 3 of the wire, respectively, and at the same time a concave portion 5 is formed by the shoulder portion 14 of the convex portion 15 of the roll 11. Is done. Since the shoulder portion 14 of the convex portion 15 is crushed so as to bite into the wire material to form the recess portion 5, the recess portion 5 is formed by plastic deformation similar to rolling.
The corrugated wire forming in the present invention is so-called crushing / bending forming that obtains a corrugated shape by bending accompanied by the shoulder 14 of the convex portion 15 of the roll 11 as described above. It can be said that it is fundamentally different from the corrugated wire rod forming which is a deformation from the aspect of the molding load when the corrugated wire rod is actually molded by the corrugated wire rod forming machine 10 of the embodiment. That is, the upper and lower rolls 11 in the corrugated wire forming machine 10 of the embodiment are replaced with gears, and the forming load when the same material wire is formed with gears is 350 to 450 kg. When the corrugated wire is formed, the forming load is 1800 to 1900 kg, which is extremely large and a completely different processing method.

FIG. 10 is a diagram schematically showing an example of a rectangular crimp wire mesh (crimp wire mesh panel) 40 for a fence formed by knitting a vertical wire 1a and a horizontal wire 1b using the above-described corrugated wire, and FIG. 4 is a perspective view showing details of a part of the crimp wire mesh 40. FIG.
The basic arrangement of the vertical wire 1a and the horizontal wire 1b is such that the waveform of the vertical wire 1a arranged at intervals in the horizontal direction is shifted by a half pitch, and alternately peaks (upward convex portions 2) and valleys (downward) The convex portions 3) are arranged, and the waveform of the horizontal wire 1b arranged at intervals in the vertical direction is also shifted by a half pitch, and peaks (upward convex portions 2) and valleys (downward convex portions 3) are alternately formed. In this arrangement, the peaks 2 and valleys 3 of both engage. In the crimp wire mesh 40 of the illustrated example, all of the horizontal wires 1b are knitted in such a manner that one vertical wire 1a is sandwiched between two sets of horizontal wires 1b. The vertical wire 1a is knitted in such a manner that only one horizontal wire 1b is sandwiched between one set of vertical wires 1a at both ends of the panel. As described above, the knitting method in which one wire is sandwiched between a set of two wires stabilizes the mesh shape and makes it difficult to cause out-of-plane deformation in the crimp wire mesh.

According to the corrugated wire 1 described above, the concave surface 2a of each of the upward convex portion 2 and the downward convex portion 3 in the form having the depressed portions 5 by crushing on both surfaces in the vicinity of the boundary between the upward convex portion 2 and the downward convex portion 3. Since the 3a side is substantially flat (substantially flat portion 6), in the crimp wire mesh formed by knitting the vertical wire and the horizontal wire by the corrugated wire 1, while securing the degree of freedom of the mesh shape to a necessary level, It is possible to prevent the mesh shape from being deformed more than necessary.
That is, FIG. 12 explains the intersection of the vertical wire and the horizontal wire, which is the engagement between the flat portions of the upward convex portion and the downward convex portion, (A) is a plan view, and (B) is a plan view. It is a figure equivalent to CC sectional drawing of (A). In FIG. 12, the lower corrugated wire is indicated with a symbol “′”. (B) The upper corrugated wire 1 in the figure is shown without a cross section.
Since the upper corrugated wire 1 and the lower corrugated wire 1 ′ are engaged with each other by surface contact, there is an appropriate resistance at the intersection of the vertical wire and the horizontal wire, and there is a gap between the vertical wire and the horizontal wire. The net shape does not become unstable due to relative rotation to the sword, and the sword does not cause out-of-plane deformation. Therefore, transportation and other handling of the wire mesh are easy, and there are few problems that it is difficult to construct a fence using the wire mesh.
On the other hand, it is possible to make an adjustment by deforming a square mesh into a parallelogram by applying force by hand, and when applied to a fence, it is effective when installed on an inclined ground.
However, since both ends of the flat portion are the dent portions 5 caused by crushing, the dent portions 5 become steps, and the limit of relative rotation between the vertical wire and the horizontal wire is determined to some extent, and the wire mesh is unnecessarily parallel with a sudden angle. It is prevented from becoming a quadrilateral.
In addition, since the flat portion 6 is a flat portion having dents 5 due to crushing at both ends, a flat portion that is long in the wave pitch direction is formed even when the wave pitch of the waveform is short, unlike the case where the flat portion is formed only by bending deformation. The flat part length (the length L of the flat part 6 in FIG. 2) necessary for deforming the mesh into a parallelogram having a desired angle can be provided.

The Example about the whole corrugated wire manufacturing apparatus which manufactures a corrugated wire is shown in FIGS.
As shown in FIGS. 13 to 15, the corrugated wire manufacturing apparatus 41 includes a wire supply device 42, a straightening machine (entrance side leveler) 43,
A corrugated wire forming machine 46, an exit side leveler device 47, a cutting machine 48, and a take-out table 49 are provided. Reference numeral 50 denotes a base of the main part of the corrugated wire manufacturing apparatus 41, and 51 denotes a base of the corrugated wire forming machine 46 installed on the base 50.

The basic structure of the corrugated wire forming machine 46 is the same as that of the corrugated wire forming machine 10 described with reference to FIGS. That is, the pair of upper and lower rolls 11 (11A, 11B) and the roll shaft 22 (22A, 22B) that are rotationally driven are common, and on the drive source side (left side in FIG. 15) of the roll shaft 22 (22A, 22B). The point that the helical gear 23 (23A, 23B) is mounted is also common. Reference numeral 24 denotes a spacer.
In addition, the rotational power is transmitted to the lower roll shaft (drive shaft) 22B via the chain coupling 27 except that a motor 25 ′ with a speed reducer that can be controlled by an inverter is used as a drive source. The driven helical gear 23B and the lower roll 11B rotate on the drive shaft 22B, and the driven helical gear 23A is attached to the upper roll shaft 22A (driven shaft). The roll rotation drive mechanism that the upper roll 11 </ b> A rotates is basically common.
Similarly to the backlash prevention mechanism 30 shown in detail in FIG. 3B, a fixed driven gear 23Aa fixed to the driven shaft 22A and a movable driven gear attached to the driven shaft 22A so as to be movable only in the axial direction. The point which employ | adopts the backlash prevention mechanism 30 which consists of 23Ab is also common.

  Conventional roll forming that is intended for plate materials and has no dents on the outer peripheral surface, and that performs simple lateral bending, that is, bending in the width direction, and dents on the outer peripheral surface for wire rods as in the present invention. Even if there is a common point of forming with a roll, with the corrugated wire forming with bending roll, crushing / bending, and vertical bending, i.e. longitudinal bending, As noted, there are very significant differences in various ways. The corrugated wire forming machine 46 according to the present invention employs various unique mechanisms and structures as described below, corresponding to the large difference.

First, the molding stand has a vibration preventing structure that prevents vibration.
As shown in FIG. 7, the upper and lower rolls 11 </ b> A and 11 </ b> B are formed into corrugated shapes in such a manner that the respective convex portions 15 and 15 alternately push the wire 1 into the concave holes 13 and 13 of the opposite rolls 11 </ b> B and 11 </ b> A. Unlike roll forming, in which a plate material is bent, the forming load is not constant but a pulsating forming load.
For this reason, in the case of a general forming stand 54 having an open structure in which the left and right stand frames 21 are independent as shown in FIG. 17 (a), the left and right stand frames 21 are deformed as indicated by broken lines by the forming load P. Vibrate in a manner.
Therefore, in the present invention, as schematically shown in FIG. 17B, a closed structure in which the stand caps 52 and 52 of the left and right stand frames 21 that support the upper and lower rolls 11 (11A and 11B) are connected by a stay 53. The molding stand 55 is used. With this closed structure, the vibration of the stand frame 21 can be greatly suppressed.
In order to prevent vibration, a compression spring 64 is disposed between the upper surface of the upper chock 58 and the lower surface of the stand cap 52 as shown in FIG.
The pulsating forming load described above directly vibrates the upper and lower roll shafts 11A up and down, and in particular vibrates up and down the upper chock 58 that supports the upper roll shaft 11A, but between the upper chock 58 and the stand cap 52. The arranged compression spring 64 acts to absorb this vibration and effectively suppresses the vibration from being transmitted to the stand cap 52.
The closed structure by the stay 53 and the compression spring 64 effectively prevent the molding stand 55 from vibrating.

Second, the mill rigidity is enhanced.
In the present invention, the material wire 1 is not simply formed by bending, but is crushed and bent to form a hollow portion 5 by plastic deformation similar to rolling by crushing so as to greatly bite into the wire as described above, Since the load acting on is extremely large, it is necessary to increase the mill rigidity (the rigidity of the molding stand). Further, in the corrugated wire forming method of the present invention in which the wire is vertically bent by passing it between upper and lower rolls having a dent on the outer peripheral surface, an accurate corrugated shape can be obtained if the mutual positional relationship between the upper and lower rolls is not maintained extremely accurately. I can't.
As described above, the forming stand is connected to the stand caps 52, 52 of the left and right stand frames 21 with the stay 53 to form a closed structure. However, this closed structure enhances the mill rigidity and the distortion of the forming stand 55 due to the forming load. Is suppressed. As a result, the mutual positional relationship between the upper and lower rolls is maintained with high accuracy, and the problem that the waveform shape with high accuracy cannot be obtained due to the distortion of the forming stand 55 is avoided.
Of course, the diameter of the roll shaft is made large to correspond to the molding load.

Thirdly, as shown in FIG. 15, upper and lower support rolls 57A and 57B meshing with the convex portions and concave portions of the respective outer peripheral surfaces are arranged beside the upper and lower rolls 11A and 11B. The inner shaft of the chock 58 that receives not only radial load but also thrust load may be worn and the roll shaft may be shifted left and right. In such a case, the upper and lower support rolls 57A meshing with the convex portion and the concave portion, Since 57B does not shift from side to side, it prevents the upper and lower rolls 11A and 11B from shifting from side to side and lowering the forming accuracy of the wire.
In general, since the upper and lower bearings are less likely to wear at the same time, the support rolls 57A and 57B are positioned by the roll shaft (22A or 22B) with less bearing wear. Therefore, the upper and lower rolls 11A and 11B are prevented from shifting to the left and right, thereby preventing the wire forming accuracy from being lowered.

Fourthly, as shown in FIG. 13 and FIG. 16, a block 60 is arranged between the upper and lower chocks 58 as the upper and lower roll reduction setting means (or reduction adjustment means). Then, by lowering the upper chock 58 until it hits the block 60 with the reduction screw 62 connected to the upper chock 58 via the connecting portion 61, a predetermined reduction amount (between the upper and lower rolls) defined by the block 60 is achieved. (Clearance) is set. The gap between the upper and lower rolls (the gap between the outer peripheral surfaces of the upper and lower rolls) is appropriately 0.3 mm in the case of the first embodiment in which the wire diameter is 4 mm.
The connecting portion 61 includes a diameter expanding body 61a fixed to the lower end of the reduction screw 62, and a holding portion 61b on the upper chock 58 side that accommodates the diameter expanding body 61a.
The above-described compression spring 64 disposed between the upper chock 58 and the stand cap 52 also has an important function in the reduction setting means (or reduction adjustment means) by the block 60.
In conventional roll forming machines that are made of sheet material and have rolls that do not have dents on the outer periphery and are simply bent, roll reduction is adjusted by inserting a clearance gauge into the gap between the upper and lower rolls. However, between the thickness dimension of the diameter-enlarged body 61a and the internal height dimension of the holding part 61b in the connecting part 61, as shown in FIG. However, the gap c is unavoidable, and therefore the adjustment nut 65 attached to the stand cap 52 is rotated so that only the rotation is possible, the lowering screw 62 is lowered, and the upper chock 58 is lowered until its lower surface hits the block 60. Even so, the upper chock 58 moves up and down by the slight gap dimension c even if each part is regarded as a complete rigid body due to fluctuations in the forming load during wire forming. However, since the compression spring 64 prevents the lifting of the upper chock 58 by a spring force, the reduction amount can be prevented from changing by the gap dimension c, and the reduction amount can be accurately maintained.

The wire supply device 42, as shown in FIG. 13, a base 71, a holding frame 72 which holds the position of the wire coil 1 ₀ which is horizontally placed on the base 71, provided above the post 73, the wire having a guide reel 74 for guiding the wire rod 1 drawn upward from the coil 1 ₀ a straight line straightening machine 43 side.
This wire supply device 42 can smoothly feed out the wire with an extremely simple and inexpensive structure.

The straightening machine 43 includes a vertical straightening machine 44 and a horizontal straightening machine 45, and corrects the warping, bending, and twisting of the wire 1 fed in a state where the direction of the curl is not constant, and straightens the straightening machine 43.
The vertical straightening machine 44 is composed of five non-driven (lower three, upper two) rolls 81 arranged in a staggered manner on the side of the vertical base 80, and the upper roll 81 can be adjusted up and down. Then correct the vertical curl of the wire. A wire rod guide 82 having a trumpet shape at the entrance is provided on the entry side.
The horizontal straightening machine 45 includes five rolls 85 arranged in a staggered manner on the left and right on the horizontal base 84, and corrects the horizontal curl of the wire rod.

A guide guide 87 for guiding the wire 1 between the upper and lower rolls 11 (11A, 11B) is disposed on the entry side of the forming stand 55 of the corrugated wire forming machine 46. As shown in FIG. 18, the guide 87 includes a trumpet guide 87a on the roll 11 side and a circular hole guide 87b on the opposite side.
When the wire rod is bitten by the upper and lower rolls 11, the convex portions 15 of the upper and lower rolls 11 alternately come into contact with the wire rod 1, and the wire rod 1 swings up and down. Since the molding process is not performed smoothly, this guide 87 is provided in order to suppress this swing as much as possible.
In this case, if the guide guide 87 is a guide with a simple cylindrical hole as a whole, the wire rod 1 hits the edge portion of the circular hole guide portion 87b due to the peristaltic movement, and scratches enter. 1 has a trumpet shape as described above.
In general, when a long material to be fed is guided by a hollow guide member, the side where the wire enters the hollow guide member (inlet side) is formed in a trumpet shape. However, in the guide 87 of the present invention, the opposite is true. As described above, the side (exit side) where the wire goes out from the hollow guide member (guidance guide 87) is formed into a trumpet shape.
In addition, each roll 81 and 85 of the straightening machine 43 in FIG. 18 is shown not as an actual arrangement but schematically. Each of the rolls 81 and 85 of the straightening machine 43 also acts as a braking force (arrow) with respect to a driving force (acting as a tensile force on the wire) when the forming roll 11 drives the wire 1 when forming the wire. A tension | tensile_strength generate | occur | produces in the wire 1 between the straightening machines 43. FIG. In order to form the wire rod by the forming roll 11, a braking force for the wire rod 11 is necessary, and the wire rod forming by the forming roll 11 is appropriately performed by the brake force by the straightening machine 43.

  The exit-side leveler device 47 corrects the warping (bending in the vertical direction) of the formed corrugated wire, and includes one fixed lower leveler roll 90 and two upper leveler rolls 90 that can be adjusted up and down. The upper and lower leveler rolls 90 are in contact with the upper and lower and lower end surfaces of the entire corrugated wire 1 (the upper end surface of the upward projecting portion 2 and the lower end surface of the downward projecting portion 3).

The cutting machine 48 is a saddle type single cut, and stops the molded product (molded wire) and cuts it to a predetermined length. A guide 91 for guiding the molded product is provided in front of the cutting machine 48.
Although not shown in the drawings, in order to cut the molded product into an accurate predetermined length, the rotational speed (or rotational angle) of the lower roll shaft 22B of the corrugated wire rod forming machine 46 is detected to detect the length of the molded product delivered. A rotary encoder is provided to detect.

In the corrugated wire manufacturing apparatus 41 described above, after the tip of the wire 1 is guided to the corrugated wire forming machine 46 and engaged between the upper and lower rolls 11A and 11B, when the motor 25 'with a speed reducer is driven, the upper and lower rolls 11A are driven. , 11B, the corrugated wire is formed, the warp (vertical warp) is corrected by the output side leveler 47, is cut into a predetermined length measured by the rotary encoder by the cutting machine 48, and is sent out on the take-out table 49. The
In the steady operation state, the wire rod is supplied from the wire rod supply device 42 by the driving force of the upper and lower rolls 11A and 11B. In other words, wire rod 1 drawn out of the wire coil 1 ₀ placed on the base 71 of the wire feeder 42 is guided by the guide reel 74, longitudinal curl is corrected by the vertical straightener 44 linear straightener 43 The horizontal curl is corrected by the horizontal straightening machine 45 to become a straight line, and is guided between the upper and lower rolls 11A and 11B of the corrugated wire forming machine 46 by the guide guide 87, and in the first embodiment by the upper and lower rolls 11A and 11B. The corrugated wire is formed as described in detail.

  In the above description, the case where the vertical wire and the horizontal wire are both used for the crimp wire mesh which is a corrugated wire has been described. However, as in the cited reference 2, only one is a corrugated wire and the other is a linear wire (metal rod). It can also be used as a corrugated wire in a certain wire mesh.

1 Corrugated wire (or wire itself)
1 ₀ Wire coil 2 Upward convex portion 2a (of corrugated wire) Concave surface 2a (opposite of upward convex portion)
3 Downward convex portion 3a (of the corrugated wire) Concave surface 3a (on the opposite side of the downward convex portion)
5 hollow part 6 substantially flat part 10 corrugated wire rod forming machine 11 (11A, 11B) roll 11A upper roll 11B lower roll 11a roll outer peripheral surface (part)
13 Concave hole 14 Convex curve shape part (shoulder part of convex part)
14a Inwardly raised portion 15 Convex portion 16 Rotation drive mechanism 21 Stand frame 22 (22A, 22B) Roll shaft 23 Helical gear 23A (movable) driven helical gear 23B Drive helical gear 29 Guide member 30 Back Rush prevention mechanism E Ends 40 on both sides in the circumferential direction (for concave holes) Crimp wire mesh (crimp wire mesh panel)
41 Corrugated wire manufacturing apparatus 42 Wire supply apparatus,
43 Straightening machine (entrance leveler),
44 Vertical straightening machine 45 Horizontal straightening machine 46 Corrugated wire rod forming machine,
47 Outlet leveler device,
48 cutting machine,
49 Extraction table 52 Stand cap 53 Stay 55 Molding stand 57 (57A, 57B) Support roll 60 Blocking setting block 61 Connecting portion 61a Expanding body 61b Holding portion 62 Reduction screw 64 Compression spring 71 Base 72 Holding frame 73 Supporting column 74 Guide Reel 80 Vertical base 81 Roll (for vertical straightening machine) 82 Wire rod guide 84 Horizontal base 85 Roll (for entry side leveler) 87 Guide guide 87a Trumpet guide 87b Circular hole guide 90 Leveler roll

Claims (5)

A pair of upper and lower rolls, and a rotation drive mechanism for rotating the upper and lower rolls,
Each of the pair of upper and lower rolls has a plurality of concave holes elongated in the circumferential direction, both of which are arranged in a row in the circumferential direction on the outer circumferential surface thereof,
The longitudinal cross-sectional shape at the center position in the width direction of the concave hole is a concave curved shape with a large curvature radius that gradually becomes shallower toward both ends in the circumferential direction from the depth of the wire diameter in the middle in the circumferential direction of the concave hole,
The boundary portion between the concave hole and the outer peripheral surface portion of the roll located at both ends in the circumferential direction of the concave hole has a convex curved shape with a small curvature radius convex outward in the radial direction and smoothly continues to the outer peripheral surface of the roll. Then, the roll outer peripheral surface part between adjacent concave holes forms a convex part with the convex curved part as both shoulder parts,
The cross-sectional shape of the concave hole is a cross-sectional shape that becomes deepest at the center position in the width direction and becomes shallower toward both ends in the width direction,
The rotational drive mechanism that rotationally drives the upper and lower rolls is such that the outer peripheral surfaces of the rolls are in contact with each other or in close proximity with a small gap, and the concave hole of one of the rolls and the convex part of the other roll face each other In another embodiment, the corrugated wire manufacturing apparatus is characterized in that both rolls are rotationally driven.   A corrugated wire for a wire mesh used in a wire mesh formed by knitting a vertical wire and a horizontal wire, and has a corrugated shape in which an upward convex portion and a downward convex portion are continuous when viewed from the side, and the upward convex portion and the downward convex portion For the metal mesh characterized by having depressions by crushing on both sides in the vicinity of the boundary with the projections, and each concave side of the upward projection and the downward projection being substantially flat including the depressions Corrugated wire. A corrugated wire manufacturing apparatus for manufacturing the corrugated wire according to claim 2,
A pair of upper and lower rolls, and a rotation drive mechanism for rotating the upper and lower rolls,
Each of the pair of upper and lower rolls has a plurality of elongated recesses in the circumferential direction, each of which is formed in a row at an equal pitch in the circumferential direction on the outer circumferential surface thereof.
The longitudinal cross-sectional shape at the center position in the width direction of the concave hole is a concave curved shape with a large curvature radius that gradually becomes shallower toward both ends in the circumferential direction from the depth of the wire diameter in the middle in the circumferential direction of the concave hole,
The boundary portion between the concave hole and the outer peripheral surface portion of the roll located at both ends in the circumferential direction of the concave hole has a convex curved shape with a small curvature radius convex outward in the radial direction and smoothly continues to the outer peripheral surface of the roll. The roll outer peripheral surface part between adjacent concave holes forms a convex part with both convex curved parts as shoulder parts,
The cross-sectional shape of the concave hole is a cross-sectional shape that becomes deepest at the center position in the width direction and becomes shallower toward both ends in the width direction,
The rotational drive mechanism that rotationally drives the upper and lower rolls is such that the outer peripheral surfaces of the rolls are in contact with each other or in close proximity with a small gap, and the concave hole of one of the rolls and the convex part of the other roll face each other In an embodiment, both rolls are driven to rotate,
A concave hole facing one convex part of one of the rolls and one convex part of the other roll when the material wire is fed between the rotating upper and lower rolls in accordance with the row of concave holes. And the two convex portions on both sides thereof are bent and deformed, and the concave surface on the opposite side of the convex portions is flattened and simultaneously the shoulders of the convex portions on both sides Forming a hollow portion to form a substantially flat portion including the hollow portion due to the crushing on each concave surface side of the upward convex portion and the downward convex portion of the corrugated wire formed from the raw material wire. An apparatus for producing corrugated wire.   The contour shape seen from the top of the concave hole is such that both edges in the width direction of the middle portion in the circumferential direction of the concave hole are parallel to each other, narrowing toward both ends in the vicinity of both ends in the circumferential direction to form a narrow arc shape 4. The corrugated wire manufacturing apparatus according to claim 3, wherein the corrugated wire manufacturing apparatus has a shape having a bulging portion which is connected to an edge and swells inside a concave hole in the middle of the narrowing portion. A corrugated wire manufacturing method for manufacturing the corrugated wire according to claim 2,
Using a pair of upper and lower rolls that are driven to rotate,
Each of the rolls has a plurality of circumferentially elongated concave holes on the outer peripheral surface thereof arranged in a row at an equal pitch in the circumferential direction,
The longitudinal cross-sectional shape at the center position in the width direction of the concave hole is a concave curved shape with a large curvature radius that gradually becomes shallower toward both ends in the circumferential direction from the depth of the wire diameter in the middle in the circumferential direction of the concave hole,
The boundary part between the concave hole located at both ends in the circumferential direction of the concave hole and the outer peripheral surface of the roll has a convex curved shape with a small curvature radius convex outward in the radial direction and smoothly continues to the outer peripheral surface of the roll. The roll outer peripheral surface part between adjacent concave holes forms a convex part with the convex curved part as both shoulder parts,
The cross-sectional shape of the concave hole is a cross-sectional shape that becomes deepest at the center position in the width direction and becomes shallower toward both ends in the width direction,
The upper and lower rolls are in a state in which the outer peripheral surfaces of the rolls are in contact with each other or in a small gap, and the concave hole of one of the rolls and the convex part of the other roll face each other. While rotating, aligning the material wire to the row of concave holes, and feeding between the upper and lower rolls,
The material wire is bent and deformed by one convex portion of one of the rolls, the concave hole facing the one convex portion of the other roll, and the two convex portions on both sides thereof, and The concave side of the opposite side of the part is flattened and at the same time the material wire is crushed by the shoulders of the convex parts on both sides to form a hollow part, and the upward corrugation of the corrugated wire formed from the material wire A corrugated wire manufacturing method characterized by forming a substantially flat portion including a dent portion due to the crushing on each concave surface side of the convex portion and the downward convex portion.

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