JP2018094560A - Plated completion wire rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide means for executing wire drawing processing of a twist bar and a screw bar without tearing off of plating during and after processing.SOLUTION: A galvanized iron wire SWMGH-3 defined by JIS G3547 is used as a material wire rod A-1. When drawing processing reaches a yield point, a target object causes plastic deformation, but when the drawing processing further reaches a Hugoniot elastic limit, the target object starts to behave like liquid. When the drawing processing reaches the Hugoniot elastic limit with the galvanized iron wire as a target of the drawing processing, a plated layer 201 and a metal layer 101 respectively behave as liquid, and the metal layer 101 sinks in the plated layer 201 due to specific gravity. The plated layer 201 is set to have a sufficient thickness taking into consideration a sinking quantity of (k).SELECTED DRAWING: Figure 6

Description

  The present invention relates to a method for manufacturing a twist bar and a screw bar with rust prevention, and more particularly to a method for manufacturing the same with plating applied.

  A twist bar is a kind of high-strength deformed reinforcing bar, which has a shape that grips and twists both ends of a wire having a polygonal cross section. The screw bar is a twist bar, in particular, one having two or more polygonal cross sections rounded. Here, “twisting” is defined as applying a force to both ends of an “elongate object” and turning them in opposite directions (Shogakukan “Daisensen”), and this definition is also used in this document.

  For both twist bars and screw bars, metal wire meshes using them give better results in terms of adhesion rate of concrete, etc. than wire meshes using metal round bars. On the other hand, the twist bar has a problem that the lubricating oil accumulates, the resistance is large, and the wire is cut during the drawing process, and the yield does not increase. On the other hand, the screw bar is suitable for mass production because it solves these problems. Therefore, standardization work in JIS is progressing at the time of filing for a wire mesh using a screw bar.

  Metal round bars, twist bars and screw bars are manufactured with a drawing machine. FIG. 1 is a conceptual diagram showing a general drawing machine. It should be noted that this diagram is merely a conceptual diagram, and it goes without saying that the actual manufacturing machine is more complicated.

  The drawing machine includes a die 901, a die holder 902, a material wire supply bobbin 911, a drawing bobbin 912, a motor 920, a power transmission mechanism 922, and a table 990.

  A wire A represents a wire being processed. Since this figure is a drawing during processing, both the material wire A-1 having a cross section as it is and the completed wire A-2 having a polygonal cross section after processing are included in the wire A.

  The wire A is prepared in a form wound as a material wire A-1 on an initial material wire supply bobbin 911. In the state of being wound around the material wire supply bobbin 911, the wire A is all the material wire A-1.

  The die 901 is a plastic deformation die having a substantially cylindrical shape for plastically deforming the material wire A-1 into the finished wire A-2. The wire A is plastically deformed from the material wire A-1 to the finished wire A-2 by passing through the through hole 901a of the die 901.

  FIG. 2 is a front view showing the appearance of a die 901 for creating a twist bar. FIG. 3 is a perspective view showing the appearance of the die 901.

The die 901 has a through hole 901a and a fitting hole 901d.

  The through hole 901a is a hole provided in the die 901 so that the wire A to be drawn is passed through the substantially cylindrical center axis. The cross-sectional shape of the finished wire A-2 is determined by the shape of the through hole 901a. In the drawing, the cross-sectional shape of the through-hole 901a is a quadrangle, but it may be a cross-section having a triangle or a pentagon or more and a cross-sectional shape desired by the manufacturer.

  When the twist bar is manufactured, the cross-sectional shape of the through hole 901a may be a substantially polygonal shape such as a substantially square shape, and may be a cross-sectional shape desired by the manufacturer. Moreover, when manufacturing a metal round bar, the cross section of the through-hole 901a must be round. In the present specification, a shape obtained by rounding at least one corner of “square”, that is, a shape obtained by rounding one “corner” to all “corners” is also referred to as “substantially square”. Similarly, a shape obtained by rounding one “corner” to all “corners” of a polygon including a quadrangle is referred to as a “substantially polygon”.

  The through hole 901a includes an approach portion, a bearing portion, and a back relief portion, but detailed description is avoided here.

  The mating hole 901d is a mating portion for fixing the die 901 in the die holder 902. Further, when the die holder 902 rotates the die 901 to manufacture the screw bar, the driving force is transmitted to the die 901 through the fitting hole 901d.

  The die holder 902 is a holder for holding the die 901 without losing the force of pulling the wire A applied in the axial direction (shown in FIG. 3) from the pulling bobbin 912. Further, it is necessary to rotate the dice 901 in the circumferential direction (shown in FIG. 2) in order to form a screw bar, and the dice holder 902 also provides the driving force for the dice 901. Then, the driving force is transmitted from the motor 920 to the fitting hole 901d of the die 901 through the power transmission mechanism 923.

  When manufacturing a twist bar and a screw bar, the die holder 902 rotates the die 901 in an arbitrary circumferential direction. In addition, when manufacturing the screw bar with the same twist amount, it is necessary to rotate at a constant speed in a certain direction. At that time, it is desirable that the winding speed of the pulling bobbin 912 is also constant (actually difficult because the distance from the drive shaft 912a varies before and after winding).

  Conversely, when making a metal round bar, it is not necessary to rotate it. This is because when the through-hole 901a has a round cross section, the cross-sectional shape does not change no matter how it is rotated. Further, even in the case of a substantially square cross section, if it is not necessary to “twist”, the die 901 need not be rotated in the circumferential direction.

  The material wire supply bobbin 911 is a cylindrical body rotatably installed on the table 990. The material wire supply bobbin 911 is rotated around the shaft 911a by the force of pulling the wire A.

  The pulling bobbin 912 is also a cylinder that is rotatably installed on the table 990. The pulling bobbin 912 is also installed so as to be rotatable about the drive shaft 912a. A major difference between the material wire supply bobbin 911 and the extraction bobbin 912 is whether or not a driving force is directly transmitted from an engine 920 described later.

  When machining, the driving force (rotational force) of the motor 920 transmitted through the power transmission mechanism 922 is transmitted to the driving shaft 912a, and the pulling bobbin 912 is centered on the driving shaft 912a by this transmitted force. To turn. The rotational force transmitted through the power transmission mechanism 922 becomes a force (pulling driving force) for pulling the wire A from the die 901 when performing the drawing process.

  It is desirable that the pulling bobbin 912 is designed to be detachable from the drive shaft 912a. This is because the number of man-hours can be reduced if the drawing bobbin 912 can be shared when the finished wire A-2 is put on a straight line machine.

  The pulling driving force determines the pulling amount per unit time. Therefore, the larger the pulling driving force, the higher the production efficiency and the lower the product cost. Therefore, the larger the pulling driving force, the better in terms of production planning.

  At the time of processing, the end of the wire A wound around the material wire supply bobbin 911 is passed through the through-hole 901a provided in the die 901, and then fixed to the drawing bobbin 912. By doing in this way, the screw bar (finished wire A-2) of a desired cross section is manufactured from the material wire A-1 wound around the material wire supply bobbin 911, and the finished wire A- is placed on another drawing bobbin 912. 2 can be wound.

  In addition, the “circumferential direction” in this specification refers to a rotation direction around the axis X of the wire A. Although the circumferential direction is described in FIG. 2, it does not necessarily have to be in the direction of the arrow in the figure, and may be in the reverse rotation direction.

  On the other hand, the “axial direction” in this specification refers to the front-rear direction of the axis X of the wire A, that is, the drawing direction of the wire A.

  The motor 920 is a motor for providing power required by the drawing machine.

  The power transmission mechanism 922 is a gear mechanism or the like for converting the driving force transmitted from the main power transmission shaft 920a into an appropriate torque and transmitting the torque to the driving shaft 912a. The power transmission mechanism 923 is a gear mechanism or the like for converting the driving force transmitted from the main power transmission shaft 920a into an appropriate torque and transmitting the torque to the die holder 902. Although this figure shows mechanical power transmission using gears, it may be realized by transmission of an electric driving force by computer control. In any case, the rotational speed of the drawing bobbin 912 and the rotation of the die 901 by the die holder 902 need to be synchronized.

  Thus, by rotating the die 901, it is possible to manufacture a completed wire A-2 having a polygonal cross section twisted. Further, when the die 901 is fixed, a metal round bar or the like is completed. The completed wire A-2 is wound around a drawing bobbin 912. The drawing bobbin 912 is removed from the table 990, and the finished wire A-2 is brought into the work with a straight line machine which is a subsequent process.

  The fact that it is wound around the drawing bobbin 912 means that the finished wire A-2 is bent and wrinkled. Therefore, finally, the finished wire A-2 is moved to the linear machine together with the drawing bobbin 912, and the bent wrinkles of the finished wire A-2 are removed. Then, it is cut to a required length, and a twist bar, a screw bar or a metal round bar having a length actually used is manufactured.

  Since twist bars, screw bars or metal round bars are inexpensive, there is a need to use them for a wide variety of applications. The most prominent is its use as a metal wire mesh for the prevention of animal damage. In this application, unlike construction, which is another main application, strength and the like are rarely required. However, since it is often left outdoors, rust prevention is required. On the other hand, plating a finished metal round bar or the like is not preferable because a plating facility is required.

For this reason, proposals for plating before the drawing process have been made in the past.

  Japanese Patent Application Laid-Open No. 2002-140935 (Patent Document 1) describes that after a wire drawing process is performed, a metal plated process is sandwiched so that a plated wire is created in a single stroke when the wire is drawn. Yes.

As another document disclosing a method of applying plating after creating a steel wire as in Patent Document 1, JP-A-2014-040656 (Patent Document 2) is cited.

Japanese Patent Laid-Open No. 2002-140935 JP Patent Publication No. 2014-040656

  However, if it is a metal round bar, it can respond also with these methods, but the aspect changes when the die 901 such as a twist bar or a screw bar is rotated. That is, the “corner” portion of the cross section becomes thin, and the plating can be peeled off during processing or during use of the product.

  An object of the present invention is to provide means for performing twisting and screw bar drawing without peeling off during / after processing.

  The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.

  A typical finished plated wire according to the present invention is obtained by performing a wire drawing operation through a plated material wire through a die, and this plated material wire is SWMGH-3 standard. .

  A typical finished plated wire according to the present invention is obtained by performing a wire drawing operation through a plated material wire through a die, and the plated material wire is SWMGS-3 standard. .

  In addition, another typical plated finished wire related to the present invention is obtained by drawing a wire through a plated material wire to a die, and this plated material wire is 155 g / square m or more on a metal layer. The plating layer is constituted.

  In these plated finished wires, the diagonal distance between the dies may be equal to the diameter of the plated material wires.

  These plated finished wires may be characterized in that the dies rotate in the circumferential direction around the axis during wire drawing.

  In these plated finished wires, the plated layer of the plated finished wires may be applied unevenly around the metal layer of the finished wires.

  This plated finished wire may be characterized in that the plated finished wire is a twist bar. Moreover, in this plated finished wire, the plated finished wire may be a screw bar.

  In these plated finished wires, the die may be characterized in that the axis is fixed in the circumferential direction during the wire drawing operation.

  The plated finished wire may be characterized in that the plated finished wire is a polygonal cross-section wire.

  This plated finished wire may be characterized in that the plated finished wire is a wire having a substantially polygonal cross section.

  When a twist bar and a screw bar are manufactured from a plated metal round bar by wire drawing by applying the present invention, it is possible to prevent plating peeling during / after processing.

It is a conceptual diagram showing a general drawing processing machine. It is a front view showing the external appearance of the dice for creating a twist bar. It is a perspective view showing the external appearance of the dice | dies of FIG. It is sectional drawing showing the cross-sectional shape of a material wire. It is sectional drawing showing the cross section of the finished wire rod which has been ideally drawn. It is sectional drawing showing the cross section of the finished wire which was used for the actual process.

Embodiments of the present invention will be described below with reference to the drawings.
(Example of ideal wire drawing)

First, the case where it processed that ideal wire-drawing was performed is demonstrated.
FIG. 4 is a cross-sectional view illustrating a cross-sectional shape of the material wire A-1. FIG. 5 is a cross-sectional view showing a cross section of the finished wire A-2 that has been drawn. Here, it is assumed that a screw bar having a substantially square cross section is manufactured, and all corners are rounded.

The material wire A-1 includes a metal layer 101 and a plating layer 201.
The metal layer 101 is assumed to be an iron wire obtained by cold working a wire conforming to JIS G3505.
The plating layer 201 is a galvanized layer applied on the metal layer 101. Zinc plating is common for rust prevention of iron, and the advantage is that the thickness of the plating layer can be made substantially uniform.

  Therefore, this material wire A-1 is a wire having a circular cross-sectional shape obtained by performing cold working on a wire conforming to JIS G3505 and then performing hot dip galvanizing or electrogalvanizing as defined in JIS G3547. .

  The diameter of the material wire A-1 is assumed to be a diameter of a circumscribed circle of the through hole 901a provided in the die 901. However, the design of the die 901 is not limited to this.

FIG. 5 shows a cross section of the finished wire A-2 after forming a desired screw bar from the material wire A-1 using the drawing machine of FIG. When ideal wire drawing is performed, the cross-sectional shape of the finished wire A-2 is assumed to be as shown in FIG.
(Actual)

  However, the Yugonio elastic limit is effective in actual processing. The Yugonio elastic limit is a pressure that becomes a boundary line that enters a region where a solid starts plastic deformation and behaves like a fluid. Solids that exceed this limit begin plastic deformation and behave like fluids. Naturally, plastic working is a working method that utilizes plastic deformation, and pressure is applied beyond the Yugonio elastic limit. Accordingly, the wire A behaves like a fluid when passing through the bearing portion of the die 901.

  Naturally, the zinc plating of the plating layer 201 of the wire rod A and the iron wire of the metal layer 101 also behave like a fluid if they exceed the Yugonio elastic limit. Since the specific gravity of iron is heavier than that of zinc, it shows the behavior of sinking into zinc under the influence of gravity. Further, since the die 901 is rotated when creating a twist bar or a screw bar, the centrifugal force due to the rotation of the die 901 cannot be ignored.

  FIG. 6 is a cross-sectional view showing a cross section of the completed wire A-2 subjected to actual processing.

  As is apparent from this, the metal layer 101 sinks into the plating layer 201 due to the influence of gravity or the like. Unlike ideal wire drawing, the thickness of the plating layer 201 applied on the metal layer 101 is actually uneven and non-uniform.

In an ideal wire drawing process, the thickness of the Z region in FIG. 5, that is, the corner of the finished wire A-2 may be considered. However, in actual processing, it is necessary to consider that the metal layer 101 becomes thin even at a location corresponding to the “side” of the cross section due to the penetration of the metal layer 101 into the plating layer 201. The inventor has found that not only “corners” but also “edges” must be considered. Based on this finding, suitable conditions were verified.
(Verification of conditions)

First, conditions such as a workpiece and a finished product are arranged.
1) Needless to say, the material wire A-1 is preferably an easily available material.
2) The thickness of the finished wire A-2 is determined by the size required when forming a welded wire mesh.
3) Considering the durability of the processing die, it is not necessary to apply pressure until it greatly exceeds the Yugonio elastic limit.

Define initial conditions based on this assumption.
Considering 1), it is preferable to use a standard product for the material wire A-1. Therefore, the inventors first decided to use the galvanized iron wire SWMGH-2 defined in JIS G3547 as the material wire A-1.

  Next, it is the thickness of the completed wire A-2. When producing a welded wire mesh for the prevention of animal damage, severe strength as used in buildings is not required. In particular, there is no need to take into consideration the effects of high temperatures caused by squeezing or fire. Nevertheless, since it is necessary to withstand the collision of a relatively large deer, the thickness of the completed wire A-2 is set to 5 mm. This also matches the specification of the galvanized iron wire SWMGH-2.

  For 3), the diameter L1 of the material wire A-1 and the diagonal distance of the finished wire A-2 are made equal so that no unnecessary strength is required for the die 901 during wire drawing. However, since the distance between the sides of the finished wire A-2 is smaller than the diameter L1, a sufficient pressure is generated between the material wire A-1 and the die 901.

  In conclusion, this condition did not work. As assumed in the early stage, galvanization peeling occurred in the Z range of FIG. When it was used on the open street to prevent beast harm, the generation of rust could not be suppressed.

Considering this failure condition, another condition was set.
The galvanized iron wire SWMGH-3 defined by JIS G3547 was used as the material wire A-1.

  The difference between the galvanized iron wires SWMGH-3 and SWMGH-2 may be considered as the amount of galvanized coating. This is because SWMGH-2 is defined as 50 g / square m or more, whereas SWMGH-3 is defined as 155 g / square m or more.

  When tested under these conditions, the plating layer 102 was not peeled off, and was sufficiently effective as a rust countermeasure.

As mentioned above, the invention made by the present inventor has been specifically described based on the embodiments. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say. For example, although SWMGH-3 has been described above, SWMGS-3 having the same coating amount is also included in the range of the present invention (see JIS G3547, Table 3 “Zinc deposition amount”).

  The present invention can be applied to a welded wire mesh used in the field of measures against animal damage that does not require strength enough to be used in the construction field. Of course, diversion to a field where similar strength conditions are sufficient is also possible.

  In the above description, the twist bar and screw bar are mainly described. However, it is also included in the scope of the present invention that the die 901 is fixed at the time of drawing and is applied to make a metal bar having a polygonal cross section or a substantially polygonal cross section.

A: Wire,
A-1: Material wire,
A-2: Completed wire,
P: rotation axis,
X: axial center,
800: Rotating body,
901: Dice,
902: Dice holder,
911: bobbin for supplying material wire,
912: Pull-out bobbin,
912a: shaft 920: motor,
922, 923: power transmission mechanism,
990: Table.

Claims (11)

It is a plated finished wire obtained by drawing wire through a plated material wire to a die,
A plated finished wire, wherein the plated material wire is SWMGH-3 standard. It is a plated finished wire obtained by drawing wire through a plated material wire to a die,
A plated finished wire, wherein the plated material wire is SWMGS-3 standard. It is a plated finished wire obtained by drawing wire through a plated material wire to a die,
A plated finished wire, wherein the plated material wire comprises a metal layer having a plating layer of 155 g / square m or more. In the finished plated wire according to any one of claims 1 to 3,
A finished plated wire, characterized in that the diagonal distance between the dies is equal to the diameter of the plated material wire. In the finished plated wire according to any one of claims 1 to 3,
A plated finished wire rod, wherein the die rotates in a circumferential direction around an axis during wire drawing. In the finished plated wire according to any one of claims 1 to 3,
A plated finished wire, wherein the plated layer of the plated finished wire is applied non-uniformly around the metal layer of the finished wire. In the finished plated wire according to claim 5,
A plated finished wire, wherein the finished plated wire is a twist bar. In the finished plated wire according to claim 5,
A plated finished wire, wherein the plated finished wire is a screw bar. In the finished plated wire according to any one of claims 1 to 3,
A plated finished wire, wherein the die fixes the axis in the circumferential direction during wire drawing. In the plated finished wire according to claim 9,
A plated finished wire, wherein the plated finished wire is a wire having a polygonal cross section. In the plated finished wire according to claim 9,
A plated finished wire, characterized in that the plated finished wire is a wire having a substantially polygonal cross section.