JP6300871B2 - Drawing machine and twist bar manufacturing method - Google Patents

Description

The present invention relates to a drawing machine and a method for manufacturing a twist bar .

  For the production of wire rods that require linearity such as for construction, it is common to perform drawing using a drawing machine and a drawing machine.

  FIG. 1 is a schematic diagram showing the overall structure of a drawing machine. FIG. 2 is a cross-sectional view showing the structure around the die of the drawing machine in use.

  In FIG. 1, the drawing die 901 and the die holder 902 are drawn as a cross-sectional view, and the other structures are shown as a top view as viewed from above. FIG. 1 also shows the direction in which the drawing machine 903 pulls the material wire A-1 and the finished wire A-2. The material wire A-1 and the completed wire A-2 are collectively referred to as a wire A.

  The drawing machine 900 includes a drawing die 901, a die holder 902, a drawing machine 903, and a guide rail 904.

  The drawing die 901 is a plastic deformation die having a substantially cylindrical shape. A through hole through which the wire A to be drawn is passed is provided in the substantially cylindrical central axis. The narrowest bearing portion 901b determines the shape dimension of the finished wire A-2 after molding. There are an approach portion 901a, a back relief portion 901c, and a fitting hole 901d with the bearing portion 901b interposed therebetween.

  When manufacturing the twist bar, the entire drawing die 901 is rotated around the substantially cylindrical central axis.

  The approach portion 901a is a part of the drawing die 901 that serves as an entrance for drawing the material wire A-1 into the drawing die 901 and reducing the outer diameter. The approach unit 901a converts the drawing force added by the drawing machine 903 into a compression force. In addition, the die used in practice may be provided with an entrance portion having a larger opening than the approach portion. However, in the present specification, the entrance portion is a design matter, and the description and the numbering in the drawing are omitted.

  The location of the approach portion 901a that contacts at least the material wire A-1 and the bearing portion 901b of the approach portion 901a are made of cemented carbide. The material wire A-1 is pressed against the cemented carbide by pulling to deform plastically, and the cross-sectional area of the material wire A-1 is deformed to that of the finished wire A-2. A portion formed of the cemented carbide is defined as a cemented carbide portion 901bh.

  The bearing portion 901b is a portion of a drawing die 901 that determines the dimensions of the completed wire A-2.

  The back relief portion 901c is a part in the die 901 that is tapered away from the finished wire A-2 so as not to damage the surface of the finished wire A-2.

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

  The die holder 902 is a holding unit for holding the drawing die 901 without losing the pulling force added by the drawing machine 903. Some objects can produce a twist bar by rotating a drawing die 901 in accordance with the position of a drawing machine 903.

  The drawing machine 903 is a drawing device that fixes the wire A by a carriage that is a part of the drawing machine 903 and pulls the fixed wire A to plastically deform it.

  The guide rail 904 is a guide rail for moving the drawing machine on a certain line or a drawing table including the guide rail.

  When a steel material such as a rod-shaped material or a wire material is drawn by a die, generally a powdery solid lubricant is accommodated in a box 905 provided on the front side of the die, and this lubricant adheres to the wire material A. The powdery lubricant becomes an oil film due to processing heat generated in the approach portion 901a when the drawing machine 903 is pulled out. A lump is formed by adhering a powdery lubricant to the oil film. This lump is enlarged each time the drawing process is continued, and the supply of the lubricant to the surface of the material wire A-1 is hindered. As a result, it was considered that scratches occurred on the surface of the finished wire A-2.

  In addition, when removing these lumps, it is necessary to stop the operation, and as a result, a reduction in production volume is inevitable. In particular, when manufacturing a twist bar, this adverse effect is remarkable, which is one of the reasons why the manufacturing cost cannot be reduced.

  Japanese Patent Application Laid-Open Publication No. 2010-036228 (Prior Document 1) describes a technique using a liquid lubricant instead of using a powdery lubricant.

JP Patent Publication No. 2010-036228

  However, the liquid is troublesome to handle, and it is necessary to take measures against liquid leakage.

  An object of the present invention is to provide means for preventing the generation of a lump of lubricant as much as possible and reducing the time required for the maintenance as much as possible, thereby reducing the manufacturing cost of a wire having a polygonal cross section.

  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.

The drawing die according to the present invention includes an approach portion and a bearing portion, and the opening of the bearing portion of the die has a substantially polygonal cross-sectional shape.

The substantially polygonal shape of this drawing die may be characterized in that at least one corner of the base polygon is replaced with a circular arc.

The substantially polygonal shape of the drawing die may be characterized in that all corners of the base polygon are replaced with curved ones.

This drawing die may have a substantially cylindrical shape centering on the drawing direction, and a bearing portion opening may be formed in a central axis of the substantially cylindrical shape.

The drawing die may be provided with a fitting portion for fixing to the die holder.

The drawing machine according to the present invention includes a drawing die having a substantially cylindrical shape and a die holder for holding the drawing die, and the drawing die has a substantially polygonal shape. It is characterized by that.

The die holder of the drawing machine may be characterized in that the drawing die is rotated about a central axis of the substantially cylindrical shape of the drawing die.

This drawing machine may be characterized in that the die holder rotates the die according to the elapsed time from the processing start time.

The drawing machine may further include a box, and after the lubricant stored in the box is applied to the material wire, the material wire is drawn into a die.

The drawing machine further includes a drawing machine and a guide rail that defines a traveling direction of the drawing machine, and the die holder rotates the die depending on where the drawing machine is located on the guide rail. It is good also as making it feature.

This drawing machine further includes a drawing machine and a guide rail that defines the direction of travel of the drawing machine, and the die holder rotates the die according to how far the drawing machine has advanced on the guide rail after the start of processing. It is good also as making it feature.

These drawing machines may be characterized by having a box for storing the lubricant in the direction opposite to the traveling direction of the drawing machine with reference to the die holder.

This drawing machine may be characterized in that a powdery solid lubricant is present in the box, and the lubricant is applied to the material wire and then drawn into the die.

Another drawing machine according to the present invention includes a drawing die having a substantially cylindrical shape, a die holder for holding the drawing die, and a box for applying a lubricant to a material wire drawn into the drawing die. And the lubricant may not accumulate in the space between the drawing die and the material wire.

Another drawing machine according to the present invention includes a drawing die having a substantially cylindrical shape, a die holder for holding the drawing die, and a box for applying a lubricant to a material wire drawn into the drawing die. And a lump of the lubricant accumulated in the space between the drawing die and the material wire may fall off without adding an operator's hand.

Another drawing machine according to the present invention includes a drawing die having a substantially cylindrical shape, a die holder for holding the drawing die, and a box for applying a lubricant to a material wire drawn into the drawing die. The die holder rotates the drawing die about the central axis of the substantially cylindrical shape of the drawing die, and the lump of lubricant accumulated by the rotation of the drawing die is separated from the drawing die. It may be characterized by dropping from the space between the material wires.

Another drawing machine according to the present invention includes a drawing die having a substantially cylindrical shape, a die holder for holding the drawing die, and a box for applying a lubricant to a material wire drawn into the drawing die. The die holder rotates the drawing die about the substantially cylindrical central axis of the drawing die, and the drawing die rotates to the space between the drawing die and the material wire rod. It may be characterized in that the accumulated mass of lubricant is prevented from becoming a certain size or more.

In these drawing machines, the space between the drawing die and the material wire may be formed as an approach portion of the drawing die.

In these drawing machines, the space between the drawing die and the material wire may be formed in the back relief portion of the drawing die.

These drawing machines may further include a drawing machine, and the drawing machine may draw the wire drawn into the drawing die.

These drawing machines may further include a drawing device including a drum and an electric motor that rotates the drum, and the drawing device may draw out the wire drawn into the drawing die.

The operation method of the drawing machine according to the present invention is to draw a drawing die having a substantially cylindrical shape and a drawing die holding the drawing die and centering on the central axis of the drawing die. A drawing machine including a die holder for rotating a die, characterized in that the drawing die is exchanged at a cycle of an actual working day.

According to the present invention , it is possible to reduce the number of times that the lump of the lubricant has been frequently removed conventionally. As a result, the production number of the wire can be increased, and the manufacturing cost can be reduced.

It is a schematic diagram showing the whole structure of a drawing machine. It is sectional drawing showing the structure of the die periphery of the drawing machine at the time of use. It is a front view of the conventional drawing die. It is a perspective view of the conventional drawing die. It is sectional drawing of the conventional die for drawing processes. FIG. 4 is an enlarged view of a “corner” portion of a conventional drawing die at a location corresponding to a range x in FIG. 3. It is a front view of the drawing die related to the present invention. It is a perspective view of the drawing die related to the present invention. It is sectional drawing of the drawing die | dye concerning this invention. It is the enlarged view which expanded the "corner" part of the drawing die | dye concerning the present invention of the location which corresponds to the range X of FIG. It is a figure showing the bar which has the substantially polygonal cross section manufactured using the die | dye in connection with this invention. It is a figure showing the twist bar which has the substantially polygonal cross section manufactured using the die | dye concerning this invention. It is an enlarged view showing the cross section of the dice | dies of the other form in connection with this invention. It is a front view of the conventional welded wire mesh. It is a front view showing the 1st metal-mesh using the twist bar in connection with this invention. It is a front view showing the 2nd metal mesh using the twist bar in connection with the present invention. It is a front view showing the 3rd metal mesh using the twist bar in connection with the present invention.

  An object of the present invention is to prevent the generation of a lump of lubricant as much as possible, and to prevent the maintenance from taking man-hours. That is, the powdery lubricant is prevented from staying in one place, and when a lump is generated, the lump is easily dropped, thereby increasing the number of polygonal cross-section wire production.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 3 is a front view of a conventional drawing die 901. FIG. 4 is a perspective view of a drawing die 901. FIG. 5 is a cross-sectional view of the drawing die 901. FIG. 6 is an enlarged view in which the “corner” portion of the drawing die 901 at the location corresponding to the range x in FIG. 3 is enlarged.

  FIG. 7 is a front view of the drawing die 101 according to the present invention. FIG. 8 is a perspective view of a drawing die 101 according to the present invention. FIG. 9 is a cross-sectional view of a drawing die 101 according to the present invention. FIG. 10 is an enlarged view enlarging the “corner” portion of the drawing die 101 according to the present invention at the location corresponding to the range X in FIG. 7.

  In addition, even if it is the drawing die 101 concerning this invention, the name of each part, such as a bearing part, does not change. Accordingly, the names of the respective parts of the drawing die 101 are described in the 100s, such as the bearing part 101b in the specification.

  The basic configuration is the same for both the drawing die 101 and the drawing die 901. As can be seen from FIG. 4 and FIG. 8, each die has a substantially cylindrical shape, and a bearing portion that determines the cross-sectional shape of the finished wire A-2 after forming on the central axis of the substantially cylindrical shape. The opening is open.

  However, the features of the present invention can be understood from FIGS.

  In the conventional drawing die 901, the two sides of the cross section of the bearing portion 901b are abutted without being processed for the purpose of making the corner of the bar to a right angle. Therefore, when the cross-sectional shape of the bearing portion 901b is a quadrangular cross section as shown in FIGS. 3 and 6, the sides intersect at right angles. Here, the cross-sectional shape of the opening of the bearing portion 901b of the die 901 shown in FIG. 6 is a quadrilateral that is a kind of polygon. This is referred to as a “basic polygonal cross section”.

  7 and 10 show the bearing portion 101b of the drawing die 101 according to the present invention. The cross-sectional shape of the bearing portion 101b according to the present invention is characterized in that the portion corresponding to the “corner” of the “basic polygonal cross section” shown in FIG. 6 is replaced by an arc, that is, a curve. Specifically, when a square bar having a side of 4 mm is created, one “corner” of the opening of the bearing portion 101 b of the drawing die 101 is an arc (curve) having a radius of about 0.8 mm. ) This makes it difficult for the lump of the lubricant accumulated in the “corner” to harden in one place.

  In the drawing die 101 according to the present invention, all four “corners” of the rectangular cross section which is the “basic polygonal cross section” are processed in this way. As a result, it is difficult for the lubricant to accumulate at all positions of the die.

  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”.

  Similarly, the rounded corners of the triangle are called “substantially triangular”, and the rounded corners of the hexagon are called “substantially hexagonal”. Hereinafter, even if the number of corners increases in the polygon, the same term is used.

  This eliminates the “corner” where the lubricant accumulates. As a result, in this die 101, the behavior of the lubricant is the same as that of the circular cross-sectional die, and it is difficult to form a lump of lubricant.

  In addition, the present invention takes the following measures.

The length of the approach portion 101a of the drawing die 101 is made as short as possible, and the angle of the die half angle β / 2 that is the approach angle (= opening) is taken as wide as possible. That is,

(Capital letter beta) / 2 in FIG. 9> (small letter beta) / 2 in FIG. 5 (Formula 1)
L1 <l1 (Formula 2)

It becomes. As a result, even if a lump of lubricant is formed, it will easily fall off naturally. In the applicant's experiment, when L1 is about 1.5 mm and the die half angle ((lowercase beta in FIG. 5) / 2 or (uppercase beta in FIG. 9) / 2) is 5 degrees or more, a lump of lubricant is formed. Even when it was done, it tended to be easy to drop out.

Similar processing is performed on the back relief unit 101c as well as the approach unit 101a. That is, the length of the back relief portion 101c is shortened, and the angle (opening) of the back relief is

(Uppercase Gamma) / 2 in FIG. 9> (Lowercase Gamma) / 2 in FIG. 5 (Formula 3)
L2 <l2 (Formula 4)

Take as wide as possible. This prevents the lubricant from forming lumps on the back relief side.

As a result, by taking the correspondence between the approach portion 101a and the back relief portion 101c as described above, the width w of the conventional drawing die 901 shown in FIG. 4 and the drawing processing related to the present invention shown in FIG. The width W of the die 101 is

W <w (Formula 5)

It is because it becomes. This can be realized by comparing FIG. 4 and FIG.

  Even if the width of the dice is reduced in this way, there is little problem in actual operation. The pressure applied to the die is such that the wire A undergoes plastic deformation. When managing the accuracy of the finished wire A-2, it is necessary to replace it with a certain period. However, in the present invention, it is assumed that the die itself is replaced in 1-2 days. This is because the entire drawing die is not broken in time.

  These measures can reduce work downtime for removing the lump of lubricant and can effectively use the entire work time for manufacturing. As a result, it becomes possible to reduce the manufacturing cost of the steel bar having a polygonal cross section.

  FIG. 11 is a perspective view showing a bar made with the drawing die 101 described above. As seen in this figure, the corners of the bar are formed in a rounded shape.

  In addition, rounding the “corners” of the dies also rounds the corners of the steel bar with a completed polygonal cross section. As a result, the user does not cut his / her hand when holding the steel bar with his bare hand, which also has a secondary effect that safety can be improved.

  The above correspondence is also effective when manufacturing a twist bar.

  The twist bar can be manufactured by continuously rotating the die by the die holder 902 according to the position of the guide rail 904 where the drawing machine 903 exists. At this time, the present invention can be easily applied by changing the die set in the die holder 902 from the die 901 to the drawing die 101.

  As described above, since there is no corner in the opening of the bearing portion 101b of the drawing die 101, the lubricant does not accumulate in one place even if the drawing die 101 is rotated, resulting in a lump of lubricant. It is difficult to do. In addition, by making the angle of approach and the angle of back relief wide, even if a lump is formed, it easily falls off naturally. These naturally have an effect also in the production of a twist bar.

  On the contrary, when the twist bar is created, the drawing die 101 always rotates around the central axis of the substantially cylindrical shape. Due to the rotational force applied to the drawing die 101, the lump of lubricant accumulated in the approach portion 101a is reduced to one place, and the lump of lubricant is less likely to be formed. In addition, the lump of lubricant that has accumulated once easily falls off from the opening of the approach portion 101a. As a result, when creating the twist bar, there is an effect that the lump of the lubricant does not easily accumulate in the approach portion 101a.

  Furthermore, when viewed from the finished product, there is an advantage over the bar material in the manufacture of the twist bar. FIG. 12 is a perspective view of a twist bar created using a drawing die 101 according to the present invention.

  When using bars, they are often used for concrete reinforcing bars. In this case, since there is a “corner” in the case of the bar, the concrete is caught and the pulling strength is maintained.

  Therefore, it may be disadvantageous in terms of pulling strength by rounding the corners. However, when a reinforcing bar is knitted using a twist bar, the pulling strength is increased by “twisting” itself of the twist bar. Therefore, even if the corners are rounded, there is no problem in strength. Note that “twist” is defined as applying force to both ends of an “elongate object” and rotating them in opposite directions (Shogakukan “Ojizumi”). Therefore, care should be taken to avoid interpretations that contradict this meaning.

  Also, in the twist bar manufactured by the manufacturing method of the present application, by rounding the “corner” of the die, the corner of the completed twist bar is also rounded. As a result, similarly to a steel bar having a polygonal cross section, when the user holds the twist bar with his bare hand, his / her hand is not cut, and safety can be improved.

  The invention relating to the present embodiment is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the scope of the invention.

  In the above description, the arc is used to erase the “angle”, but it may be configured as a set of obtuse angles. FIG. 13 is a diagram showing a set of obtuse angles. That is, it is included in the range of the present invention that the “angle” formed by one 90 degree angle is configured by nine obtuse angles so as not to be collected in one place. There is no problem even if the “corner” is replaced with a free curve as well as an arc.

  Further, depending on the situation, even one with one or two rounded corners may endure use. This is because, when making a bar, if only the corner that comes to the bottom of the die is rounded, the lubricant may not accumulate.

  Of course, the drawing machine using the drawing die 101 according to the present invention is also included in the range of the present invention.

  When making a twist bar using the drawing die 101 according to the present invention, 1) rotating the drawing die 101 according to the position of the drawing machine 903 on the guide rail 904 (explained). 2) The die holder rotates the drawing die 101 according to the present invention in accordance with the elapsed time from the work start time, and 3) The drawing die 101 in accordance with the distance traveled by the drawing machine after starting the processing. Rotating the lens is naturally included in the range of the present invention.

  Furthermore, in the embodiment, it has been described whether the drawing machine 900 that moves linearly is used. This is because the linearity of the finished wire A-2 is taken into consideration. However, if the linearity of the finished wire A-2 is not concerned, the drawing using a method using a drawing machine that winds the finished wire A-2 around a drum driven by an electric motor instead of the drawing machine 900. A processing machine may be used. When making a twist bar using a drum, the die holder 102 rotates the drawing die 101 according to 4) the number of revolutions of the drum, 5) the elapsed time from the start of the operation, and 6) the angular velocity of the drum. I will let you.

(Second Embodiment)
Hereinafter, a second embodiment will be described.

  As described above, it has been described that a twist bar can be manufactured at low cost by using the first embodiment of the present invention (see FIG. 12). In the second embodiment of the present application, the production of a wire mesh using this inexpensive twist bar will be described.

  “Welding wire mesh” refers to a wire mesh in which iron wires are arranged orthogonally and their intersections are electrically resistance welded to form a lattice shape. Conventionally, a welded wire mesh shown in JIS G 3551 (non-patent document) or the like has been created by combining “round iron wires” in a cross-beam shape.

  FIG. 14 is a front view of a conventional welded wire mesh. The welded wire mesh described in FIG. 14 is manufactured by combining round bars and using a round wire. Here, “round iron wire” means an iron wire having a circular cross-sectional shape (as defined in JIS G 3551).

  According to JIS G 3551, among the reinforcing bars constituting the reinforcing bar lattice in the wire mesh, the “vertical line” is perpendicular to the iron wire or bar wire in the production direction (machine feed direction), and the horizontal line is perpendicular to the production direction (machine feed direction). Defined as directional wire or bar. However, it should be noted that in this specification, the iron wires constituting the wire mesh are defined as “vertical lines” that are arranged in any one direction, and the iron wires in the direction perpendicular to the vertical lines are defined as “horizontal lines”.

  The vertical lines 501a, 501b, 501c, 501d and the horizontal lines 502a, 502b, 502c, 502d made of the “round iron wire” shown in FIG. 14 are abbreviated as shown in FIG. 12 of the first embodiment of the present invention. The second embodiment of the present application replaces a twist bar having a polygonal cross section.

  FIG. 15 is a front view showing a first wire net using a twist bar according to the present invention. As is apparent from this figure, all the vertical lines and horizontal lines shown in FIG. 14 are replaced with vertical lines 601a, 601b, 601c, 601d, horizontal lines 602a, 602b, 602c, 602d and joined by a pneumatic multi-spot welder or the like. To do.

  As described above, when a reinforcing bar is knitted using a twist bar, the pull-out strength is increased by twisting the twist bar itself. Moreover, since the yield at the time of manufacture of a twist bar improves by 1st Embodiment, the cost of the metal-mesh using it as a result also falls.

  By doing in this way, weight reduction per unit length can be achieved, giving the same intensity | strength as the conventional round iron wire. As a result, the weight of the entire welded wire mesh can be reduced.

  FIG. 16 is a front view showing a second wire mesh using a twist bar according to the present invention. In this figure, the horizontal line 502a, 502b, 502c, 502d in FIG. 14 is a diagram showing a welded wire net when the horizontal lines 702a, 702b, 702c, 702d, which are twist bars related to the present invention, are changed. In this figure, vertical lines 701a, 701b, 701c, 701d are round iron wires. Of course, there is no problem even if the twist bar is applied only to the vertical line. By doing in this way, it becomes possible to provide a wire mesh having different characteristics in the vertical line direction and the horizontal line direction.

  FIG. 17 is a front view showing a third wire net using the twist bar according to the present invention. FIG. 17 is a view showing a welded wire mesh when the ratio of the round iron wire to the polygonal cross-section metal wire is 1: 1 for both the vertical and horizontal lines. That is, the vertical lines 501b and 501d and the horizontal lines 502b and 502d in FIG. 14 are replaced with twist bars according to the present invention.

  That is, twist bars according to the present invention are used for the vertical lines 801b and 801d and the horizontal lines 802b and 802d. On the other hand, a round iron wire is used for the vertical lines 801a and 801c and the horizontal lines 802a and 802c. In this way, it is possible to provide a wire mesh that can be used without being aware of the vertical line direction and horizontal line direction.

  In FIG. 17, the ratio of the round cross-section metal wire to the twist bar was 1: 1. However, the ratio may be changed to 1: 2 or 2: 1 (other ratios are possible as well) as appropriate. Furthermore, you may change the ratio of a round cross-section metal wire and a twist bar with a vertical line and a horizontal line. By using wires having different characteristics in this way, it is possible to make a lightweight wire mesh while having a certain degree of resistance to “drawing”.

  Further, the characteristics of the entire wire mesh can be easily adjusted by the ratio of the round iron wire and the twist bar according to the present invention. As a result, it is possible to give variety to the wire mesh and develop various products.

  Further, in the above description, only the round iron wire and the twist bar related to the present invention have been described. However, the polygonal cross-section wire (not twisted) related to the present invention, the polygonal cross-section wire not related to the present invention, and the present invention. Naturally, a twist bar, which uses a deformed iron wire defined in JIS G 3551, falls within the range of the present invention. Also, one wire net may be manufactured with three or more types instead of two types.

  Thus, it is included in the range of this invention to mix a round cross-section metal wire and a twist bar in one metal mesh. On the contrary, it is possible to adjust the properties by mixing and increase the development of product variations as shown in FIG. 17 without using the polygonal cross section wire and the twist bar included in the first embodiment of the present invention. It can be said that it is included.

  When used as a building foundation, even with the configuration as shown in FIGS. 16 and 17, the use of the twist bar according to the present invention can ensure adhesion to concrete.

  As described above, the welded wire mesh using the twist bar according to the present invention makes it possible to create a welded wire mesh that has high adhesion to concrete without using an expensive “deformed iron wire” and is inexpensive and lightweight.

  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.

  The present invention is used to improve the dies used in the drawing process and to reduce the cost of the finished wire A-2 manufactured using the dies.

A: Wire,
A-1: Material wire,
A-2: Completed wire,
101a, 901a: approach part,
101b, 901b: bearing part,
101c, 901c: back relief part,
101d, 901d: mating holes,
501a, 501b, 501c, 501d: vertical line,
502a, 502b, 502c, 502d: horizontal line,
601a, 601b, 601c, 601d: vertical line,
602a, 602b, 602c, 602d: horizontal line,
701a, 701b, 701c, 701d: vertical line,
702a, 702b, 702c, 702d: horizontal line,
801a, 801b, 801c, 801d: vertical line,
802a, 802b, 802c, 802d: horizontal line,
900: Drawing machine,
101, 901: Die for drawing,
902: Dice holder,
903: Drawing machine
904: Guide rail,
905: Box.

Claims (11)

A drawing die having a substantially cylindrical shape; and a die holder for holding the drawing die and rotating the drawing die about a central axis of the substantially cylindrical shape of the drawing die. A drawing machine including
The opening of the bearing portion of the drawing die has a substantially polygonal cross-sectional shape,
Said generally polygonal all SANYO is replaced with at least one corner of the polygon underlying those were connected by a curve,
A drawing machine characterized in that the cross-sectional shape of the opening is the same along the drawing direction of the wire . A drawing die having a substantially cylindrical shape; and a die holder for holding the drawing die and rotating the drawing die about a central axis of the substantially cylindrical shape of the drawing die. A drawing machine including
The opening of the bearing portion of the drawing die has a substantially polygonal cross-sectional shape,
All SANYO said generally polygonal was replaced with one that connecting all corners of the polygon underlying a curve,
A drawing machine characterized in that the cross-sectional shape of the opening is the same along the drawing direction of the wire . A drawing die having a substantially cylindrical shape; and a die holder for holding the drawing die and rotating the drawing die about a central axis of the substantially cylindrical shape of the drawing die. A drawing machine including
The opening of the bearing portion of the drawing die has a substantially polygonal cross-sectional shape,
All SANYO said generally polygonal replaced with at least one corner of the polygon underlying those were connected by an arc,
A drawing machine characterized in that the cross-sectional shape of the opening is the same along the drawing direction of the wire . A drawing die having a substantially cylindrical shape; and a die holder for holding the drawing die and rotating the drawing die about a central axis of the substantially cylindrical shape of the drawing die. A drawing machine including
The opening of the bearing portion of the drawing die has a substantially polygonal cross-sectional shape,
All SANYO said generally polygonal was replaced with one that connecting all corners of the polygon underlying an arc,
A drawing machine characterized in that the cross-sectional shape of the opening is the same along the drawing direction of the wire . In the drawing machine in any one of Claims 1-4 ,
A drawing machine, wherein the die holder rotates the die according to an elapsed time from a processing start time. In the drawing machine according to claim 5 ,
And a drawing machine,
A guide rail defining a traveling direction of the drawing machine,
The drawing machine according to claim 1, wherein the die holder rotates the die according to which position on the guide rail the drawing machine is located. In the drawing machine according to claim 5 ,
And a drawing machine,
A guide rail defining a traveling direction of the drawing machine,
A drawing machine characterized in that the die holder rotates the die according to how far the drawing machine has advanced on the guide rail after the start of machining. A twist bar manufacturing method comprising a first step of plastically processing the wire by pulling the wire from a through hole of a drawing die that rotates at substantially the same speed in the circumferential direction,
The opening of the bearing portion of the drawing die has a substantially polygonal cross-sectional shape,
Said generally polygonal all SANYO is replaced with at least one corner of the polygon underlying those were connected by a curve,
A method of manufacturing a twist bar, wherein the opening has the same cross-sectional shape along the drawing direction of the wire . A first step of plastically processing the wire rod by drawing the wire rod from a through hole of a drawing die that rotates at substantially the same speed in the circumferential direction, and a method for producing a twist bar,
The opening of the bearing portion of the drawing die has a substantially polygonal cross-sectional shape,
All SANYO said generally polygonal was replaced with one that connecting all corners of the polygon underlying a curve,
A method of manufacturing a twist bar, wherein the opening has the same cross-sectional shape along the drawing direction of the wire . A first step of plastically processing the wire rod by drawing the wire rod from a through hole of a drawing die that rotates at substantially the same speed in the circumferential direction, and a method for producing a twist bar,
The opening of the bearing portion of the drawing die has a substantially polygonal cross-sectional shape,
All SANYO said generally polygonal replaced with at least one corner of the polygon underlying those were connected by an arc,
A method of manufacturing a twist bar, wherein the opening has the same cross-sectional shape along the drawing direction of the wire . A first step of plastically processing the wire rod by drawing the wire rod from a through hole of a drawing die that rotates at substantially the same speed in the circumferential direction, and a method for producing a twist bar,
The opening of the bearing portion of the drawing die has a substantially polygonal cross-sectional shape,
All SANYO said generally polygonal was replaced with one that connecting all corners of the polygon underlying an arc,
A method of manufacturing a twist bar, wherein the opening has the same cross-sectional shape along the drawing direction of the wire .

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