JP2015020228A - Wire saw cord - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire saw cord which can increase a ratio of abrasive grains contributing to cutting and also suppress shortening of product life, by using a simple configuration.SOLUTION: A stranded wire in which a plurality of element wires are stranded is used as a core wire. Outer peripheral element wires 11 constituting an outer peripheral surface of the core wire have an exterior side which is a flat surface 11a. Abrasive grains 17 are fastened and fixed to the flat surface 11a via for example, an abrasive grain fixation layer 16 such as a plated layer. Preferably, an abrasive grain non-attached layer 15 is disposed between the outer peripheral element wires 11.

Description

  The present invention relates to a wire saw cord in which abrasive grains are fixed to a stranded wire such as a steel cord, and more particularly to a wire saw cord suitably used for cutting concrete, stone, metal structure, plastic structure or the like.

  Conventionally, a wire saw cord has been widely used for cutting various articles to be cut. For example, if the object to be cut is concrete, stone, metal structure, or plastic structure, a steel cord or wire rope composed of a plurality of wires is used as a core wire, and a predetermined number of circular beads are passed through the core wire. Wire saw cords are known that are configured to be fixed at intervals. This type of wire saw is configured in a loop shape by connecting the ends of steel cords, and is driven at a high speed of, for example, about 30 m / sec during a cutting operation.

  For example, in Patent Document 1, a plurality of diamond beads are fixed at a predetermined interval on a steel cord coated with rubber or resin, and spacers made of resin or rubber are disposed between the diamond beads. A diamond wire saw is disclosed.

  Incidentally, the wire saw cord is also used for cutting high hardness and high brittle materials such as silicon. As a wire saw cord for this application, a configuration is known in which abrasive grains, not circular beads, are fixed to a core wire via a resin or a plating layer.

  For example, Patent Document 2 discloses a wire tool having a structure in which diamond abrasive grains are fixed to the surface of a core wire formed by twisting a plurality of strands through an electrodeposition plating layer such as nickel.

JP 09-155630 A Japanese Patent Laid-Open No. 11-277398

  In the diamond wire saw disclosed in Patent Document 1, an annular diamond bead is fixed through a steel cord or a wire rope that is a core wire. Therefore, it is necessary to coat the surface of the core wire with resin or rubber or to use a spacer made of a flexible material so that the diamond beads do not deviate from a predetermined position. As a result, the structure as a diamond wire saw is complicated. Further, since the diamond beads tend to be detached due to the disconnection of the core wire, diamond beads larger than the abrasive grains may be scattered around, particularly when the core wire is disconnected during the cutting operation.

  Moreover, in the wire tool disclosed by patent document 2, it is the structure which fixed the diamond abrasive grain to the surface of the strand wire which is a core wire with the plating layer. Therefore, only the diamond abrasive grain located on the outermost periphery of the stranded wire contacts the cutting object, and the diamond abrasive grain located between the strands does not contact the cutting object. Therefore, the ratio of diamond abrasive grains that contribute to cutting is reduced with respect to all diamond abrasive grains fixed to the core wire. Moreover, diamond abrasive grains positioned between the strands may damage the surfaces of adjacent strands, and the product life as a wire saw cord tends to be shortened.

  The present invention has been made to solve such problems, and with a simple configuration, it is possible to increase the ratio of abrasive grains that contribute to cutting and to suppress shortening of the product life. An object is to provide a simple wire saw cord.

  In order to solve the above problems, a wire saw cord according to the present invention is a wire saw cord in which a stranded wire obtained by twisting a plurality of strands is used as a core wire, and abrasive grains are fixed to the outer peripheral surface of the core wire. When the strands constituting the outer peripheral surface of the core wire are outer peripheral strands, the outer peripheral strand has a flat surface on the outer side, and diamond polishing is applied to the flat surface of the outer peripheral strand. In this configuration, the grains are fixed.

  According to the said structure, while being able to implement | achieve favorable cutting performance with a simple structure compared with the type using a diamond bead among the conventional wire saws, for example, the diameter can be made small (thinner). If the diameter is about the same as that of a conventional wire saw, the diameter of the core wire can be increased (thicker) and the strength thereof can be improved. Moreover, in the said structure, since a lot of fine abrasive grains adhere to the flat surface, the ratio of the abrasive grains contributing to cutting can be increased as compared with the structure in which diamond beads are arranged at a predetermined interval. At the same time, the cutting resistance can be made smaller than before.

  Further, as compared with the type in which diamond abrasive grains are fixed to the surface of the stranded wire by the plating layer, the peripheral strands are not “bonded” by the plating layer, and are relatively movable. Therefore, the fall of the flexibility of a core wire is avoided and possibility that an abrasive grain will detach | leave and will enter between outer periphery strands can be avoided. Further, since the abrasive grains are not substantially fixed between the outer peripheral wires, the ratio of the abrasive grains contributing to the cutting can be increased. Therefore, according to the present invention, it is possible to improve flexibility, flexibility, durability, cutting performance, and the like, as compared with the prior art.

  The wire saw cord having the above-described configuration may be configured such that an abrasive grain non-adhering layer to which the abrasive grains are not fixed is formed between the outer peripheral strands.

  Further, in the wire saw cord having the above-described configuration, the outer peripheral wire may be configured such that 20% or more of the peripheral length in the cross section of the outer peripheral wire is a flat surface.

  In the wire saw cord having the above configuration, the outer peripheral surface of the core wire may be configured by three or more outer peripheral strands.

  In the wire saw cord having the above configuration, the strand is at least one of a metal wire, a chemical fiber, and a natural fiber, and the material of the abrasive grains is diamond, boron nitride, alumina, or silicon carbide. It may be at least one of them.

  In the present invention, with the above configuration, it is possible to provide a wire saw cord capable of increasing the ratio of abrasive grains contributing to cutting with a simple configuration and suppressing the shortening of the product life. There is an effect.

It is a typical sectional view showing an example of composition of a wire saw cord concerning an embodiment of the invention. (A)-(c) is the contrast of the cross section which shows each process of the manufacturing method of the wire saw cord which concerns on embodiment of this invention, and a side. (A), (b) is a cross-sectional and side contrast diagram schematically showing an example of a method for forming a non-abrasive layer in the manufacturing method shown in FIGS. 2 (a) to 2 (c). It is a figure which shows the external appearance of the wire saw cord of one Example of this invention. It is a figure which shows the external appearance of the wire saw cord used as a comparative example.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference symbols throughout the drawings, and redundant description thereof is omitted.

[Basic configuration of wire saw cord]
The wire saw cord according to the present invention has a configuration in which a strand formed by twisting a plurality of strands is used as a core wire, and abrasive grains are fixed to the outer peripheral surface of the core wire, and the outer peripheral surface of the stranded wire that is the core wire is formed. A portion on the outer side of the constituent wire (a portion serving as an outer peripheral surface of the core wire) is a flat surface. The abrasive grains are fixed to the flat surface.

  The stranded wire used as the core wire may be a metallic stranded wire obtained by twisting metallic strands (wires) as typified by a steel cord. A typical example of the metal strand is a hard steel wire. A hard steel wire is preferable because it sufficiently satisfies the mechanical performance required for a wire saw and is excellent in cost and handleability. Of course, the material of the element wire is not limited to the hard steel wire, and may be other metal wires that can be used as a wire saw, such as a stainless steel wire and a tungsten wire.

  Moreover, the strand which comprises a strand wire is not limited only to 1 type, Two or more types of strands may be used. For example, you may use together a hard steel wire and the metal wire (For example, the said stainless steel wire or a tungsten wire etc.) of another material. Moreover, even if it is the same hard steel wire, you may use together a wire from which a diameter differs. That is, you may twist together using a thick metal wire and a thin metal wire together.

  Furthermore, you may use together the nonmetallic wire which consists of materials other than a metal like a chemical fiber or a natural fiber with a metal wire. In addition, all the strands may be non-metallic wires depending on the performance required for the wire saw.

  The kind of the stranded wire is not particularly limited, and may be a cross stranded wire, a parallel stranded wire, or a stranded wire by other twisting method. Specific examples of the cross-stranded wires include 1 + 6 + 12, 2 + 8, 2 + 8 + 14.3 + 9, 3 + 9 + 15, and the like. Further, the parallel stranded wire may be any of a seal type, a Warrington type, a filler type, a combination thereof, and the like. Typically, S19 is given as the seal type, W19 is given as the Warrington type, and Fi25 or Fi29 is given as the filler type, but it is of course not limited thereto. Further, it may be a single unit of 1 × 3, 1 × 4, and 1 + 6.

  In addition, both a cross strand wire and a parallel strand wire are twisted together so that multiple layers may be comprised. Among these, the cross-stranded wires basically use the strands having the same diameter, and are twisted so that the twist angles of the respective layers are substantially equal. Therefore, the strands of each layer are in point contact with each other between adjacent layers. On the other hand, parallel stranded wires are used in combination with strands of different diameters, and are twisted so that the upper strands are positioned between the strands constituting the lower layer. The Therefore, the strands of each layer are in line contact with each other between adjacent layers.

  In general, the parallel stranded wire in which the strands are in line contact tends to have better physical properties such as fatigue resistance, wear resistance, and flexibility than the cross stranded wire in point contact. Therefore, when a cross stranded wire and a parallel stranded wire are compared, generally, a parallel stranded wire is preferably used as a core wire, although it depends on the use or use conditions of the wire saw cord according to the present invention.

  Furthermore, although a rope obtained by twisting each of the stranded wires can also be used as a core wire, when used as a wire saw, if the core wire is a rope or the like, a large number of abrasive grains fixed to the rope are cut. In some cases, the object can only be partially contacted. Therefore, it is usually not appropriate to use a rope or the like as the core wire.

  The abrasive grains used in the present invention can typically be diamond abrasive grains, but of course not limited thereto, and known materials such as boron nitride, alumina and silicon carbide can be suitably used. Moreover, the particle diameter of an abrasive grain is not specifically limited, The thing of a well-known range can be used suitably according to the use etc. of a cutting | disconnection. For example, if it is a diamond abrasive grain, a thing with a particle size in the range of 5-30 micrometers will be mentioned, for example.

  The method for fixing the abrasive grains is not particularly limited, and a known fixing material such as a plating layer, brazing, or a resin binder may be used. As a fixing method using the plating layer, for example, the abrasive grains may be fixed to the core wire (twisted wire) using known electroplating. The material to be plated typically includes nickel, but is not limited thereto.

  As a fixing method by brazing, a known brazing material is applied to a core wire (twisted wire) by a known method, then abrasive grains are embedded in the brazing material, and the brazing material is melted by a known method. Examples of the material of the brazing material include, but are not limited to, silver brazing or copper brazing having a known composition.

  As a fixing method using a resin binder, a resin solution containing a resin and abrasive grains is prepared under known conditions, this resin solution is applied to the surface of a core wire (twisted wire) under known conditions, and heated under known conditions. Or it may be fired. The resin to be used is not particularly limited, and typically includes phenol resin, formalin resin, polyurethane resin, polyester resin, polyimide resin, epoxy resin, melamine resin, urea resin, and the like.

[Configuration of outer peripheral wire and flat surface]
In the wire saw cord according to the present invention, the abrasive grains are fixed to the surface of the stranded wire described above. On the outer peripheral surface of the stranded wire, a flat surface is formed on the strand constituting the stranded wire. Abrasive grains are fixed. This point will be specifically described with reference to FIG.

  The wire saw cord 10 shown in FIG. 1 is a parallel stranded wire having a core wire Fi29. Fi29 is twisted so that a plurality of strands form four layers from the center to the outer periphery. For convenience of explanation, if the strands constituting the outer circumferential surface of the core wire are the outer strand 11 and one strand located at the center of the core wire is the center strand 12, the outer strand 11 and the center strand 12 Between these, the first layer strand 13 and the second layer strand 14 are present.

  The first layer strand 13 has a diameter smaller than that of the center strand 12 and is substantially the same diameter as the outer periphery strand 11, and seven wires are arranged around the center strand 12. The second layer wire 14 is smaller in diameter than the first layer wire 13 and the outer peripheral wire 11 (substantially half or less), the two adjacent first layer wires 13 and the one outer peripheral wire 11. It is located so as to be sandwiched between. The number of the second layer strands 14 is seven as with the first layer strands 13.

  The outer peripheral wire 11 is located on the outermost periphery of the parallel stranded wires so as to be in contact with one first layer strand 13 and one second layer strand 14, and the number of the outer strands is 14 in total. It is a book. In the present invention, the outer peripheral wire 11 has a flat surface 11a at a portion which becomes the outer peripheral surface of the core wire, and an abrasive fixed layer 16 (plating layer, brazing, resin binder, etc.) is provided on the flat surface 11a. Abrasive grains 17 (for example, diamond abrasive grains) are fixed thereto.

  This flat surface 11a should just be comprised as a surface which can be considered as the outer peripheral surface, when the whole strand wire is regarded as a single cylindrical structure. The shape or size of the flat surface 11a is not particularly limited, but it is preferable that at least 20% or more of the circumference of the circumference is the flat surface 11a when the cross section of the outer peripheral wire 11 is viewed as a circle. . If 20% or more of the circumference is the flat surface 11a, a sufficient area for fixing the abrasive grains 17 can be secured. On the other hand, the upper limit of the peripheral length is not particularly limited, but may be basically 50% or less from the viewpoint of maintaining the mechanical performance of the outer peripheral wire 11 well. Of course, depending on the application of the wire saw cord 10, the flat surface 11a may be less than 20% of the peripheral length of the outer peripheral wire 11.

  The flat surface 11 a may be formed along with the production of the stranded wire, or a strand on which the flat surface 11 a is formed in advance may be prepared, and the stranded wire may be manufactured so that this becomes the outer peripheral strand 11. As a method of forming the flat surface 11a with the manufacture of the stranded wire, for example, a die having a diameter smaller than the diameter of the stranded wire is prepared, and a plurality of strands are passed through when the strands are twisted together ( A die forming method) or a method of suppressing an outer peripheral surface using a known roller (twist forming method) when twisting a plurality of strands is not particularly limited. The flat surface 11a can be formed on the outer peripheral wire 11 by using a brush or the like other than the die or the roller.

  Further, as shown by shading in FIG. 1, an abrasive grain non-adhesion layer 15 to which abrasive grains 17 are not fixed may be formed between the outer peripheral strands 11. This abrasive grain non-adhesion layer 15 is formed as a layer that fills the space between adjacent outer peripheral strands 11, but does not hinder the movement of the relative position of the outer peripheral strand 11 in the core wire (stranded wire). For example, if the core wire (twisted wire) is bent during the cutting operation by the wire saw cord 10, there is a possibility that the position of the outer peripheral strand 11 is shifted along with this bending. In order to enable such movement, the outer peripheral wire 11 is provided.

  If the abrasive grain non-adhesion layer 15 is provided between the outer peripheral wires 11, it is possible to avoid the abrasive grains 17 from being fixed between the outer peripheral wires 11. Therefore, in the step of fixing the abrasive grains 17 to the core wire (twisted wire), the abrasive grains 17 can be substantially fixed only to the flat surface 11a. Therefore, it is substantially prevented that the abrasive grains 17 are interposed between the outer peripheral wires 11 and the surface of the outer peripheral wires 11 is damaged.

  Further, due to the presence of the abrasive grain non-adhesive layer 15, the abrasive fixed layer 16 and the abrasive grains 17 are formed only on the flat surface 11a. Therefore, the adjacent outer strands 11 are separated from each other without being bonded via the abrasive fixed layer 16 and movable to each other. Thereby, the flexibility of the wire saw cord 10 is improved.

  Further, even when the wire saw cord 10 is repeatedly bent when the object to be cut using the wire saw cord 10 is cut, the abrasive fixed layer 16 formed on the flat surface 11a is substantially avoided from being damaged. Therefore, it is avoided that the abrasive grains 17 are detached from the abrasive fixed layer 16, so that the detached abrasive grains 17 are sandwiched between the peripheral strands 11 to substantially damage the outer peripheral strands 11. Is prevented.

  The specific configuration of the abrasive grain non-adhesive layer 15 is not particularly limited, and an appropriate material and formation method can be selected according to the manufacturing process of the wire saw cord 10 or the fixing method of the abrasive grains 17. For example, if the abrasive grain fixing layer 16 is a metal layer or metal brazing by electroplating, the abrasive grain non-adhesion layer 15 can employ a resin. Examples of the resin that can be used include the various resins described above that can be used as the abrasive fixed layer 16.

  The core wire of the wire saw cord 10 according to the present invention may be a stranded wire obtained by twisting two or more strands. However, in order to secure a sufficient area of the flat surface 11a, the outer peripheral strand 11 is 3 The number of wires is preferably at least, and more preferably a stranded wire having a two-layer structure or more composed of a layer of the outer peripheral wire 11 and a center wire 12 (center layer).

  When the stranded wire is composed of two strands, the spacing between the strands is increased. Therefore, even if the flat surface 11a having the largest possible area is formed on the two strands, the spacing between the strands is increased, so that the fixed amount of the abrasive grains 17 per unit length of the wire saw cord 10 is small. There is a risk. Therefore, it is preferable that the number of outer peripheral wires 11 be three or more. Moreover, since the space | interval of the outer periphery strands 11 can be made smaller if a strand wire is two or more layers, the adhesion amount of the abrasive grain 17 per unit length of the wire saw cord 10 can be enlarged.

[Example of wire saw cord production]
The manufacturing method of the wire saw cord 10 according to the present invention is not particularly limited, and a known method may be used so as to realize the above-described configurations. In the present embodiment, the case where the wire saw cord 10 includes the abrasive grain non-adhesion layer 15 will be described as an example with reference to FIGS. 2 (a) to 2 (c) and FIGS. An example of a method for manufacturing the wire saw cord 10 will be described.

  2 (a) to 2 (c) and FIGS. 3 (a) and 3 (b), for convenience of explanation, 1 + 6 (a configuration including six outer strands 11 and one center strand 12 is used as a core wire. However, the present invention is of course not limited to this configuration. Moreover, the manufacturing method of the wire saw cord 10 provided with the abrasive grain non-adhesion layer 15 is not limited to the manufacturing method as shown in FIGS. 2 (a) to 2 (d) and FIGS. 3 (a) and 3 (b). These methods, conditions, manufacturing processes, and the like can be employed as appropriate.

  First, as shown in FIG. 2A, a steel cord 20 twisted so that six outer peripheral strands 11 are positioned around one central strand 12 is prepared. This steel cord 20 becomes a core wire. As the steel cord 20, a commercially available one may be used, or a suitable strand may be selected and twisted.

  Next, as shown in FIG. 2B, the flat surface 11a is formed on the outer peripheral wire 11 by cutting the outer peripheral surface of the steel cord 20 by the forming method described above. At this time, the abrasive grain non-adhesion layer 15 may be simultaneously formed between the outer peripheral strands 11. Thereafter, the abrasive grain fixing layer 16 is formed on the flat surface 11a by, for example, electroplating, and the abrasive grains 17 are fixed.

  Since the outer peripheral surface of the core wire which is a strand wire is cut at this time, the unevenness | corrugation by the twisting of the outer periphery strand 11 is shaved. Therefore, if the whole core wire is seen, it is close to a cylindrical shape as a whole, and the flatness of the outer peripheral surface of the core wire is also improved. Therefore, many abrasive grains 17 on the outer peripheral surface of the core wire are easily fixed.

  Moreover, since the resin non-adhesive layer 15 is provided between the flat surfaces 11 a (between the outer peripheral strands 11), the abrasive fixed layer 16 is formed on the abrasive non-adhesive layer 15. Therefore, the abrasive grains 17 are not fixed. Therefore, as shown in FIG. 2C, many abrasive grains 17 are fixed on the flat surface 11 a, but the abrasive grains 17 are not fixed between the outer peripheral wires 11. Thereby, the wire saw cord 10 according to the present embodiment is manufactured.

  Here, the method of forming the flat surface 11a and the abrasive grain non-adhesive layer 15 is not particularly limited. For example, as shown in FIG. 3A, a method of providing a stranded wire covering layer 25 on the outer periphery of the steel cord 20, or As shown in FIG. 3B, a method of providing the stranded wire covering layer 25 after forming the flat surface 11a on the steel cord 20 can be exemplified.

  In the former method, as shown in FIG. 3A, the outer periphery of the steel cord 20 is covered with a known resin bond or the like to form a stranded wire covering layer 25. Next, the outer peripheral surface of the steel cord 20 is cut using means such as a die or a brush (not shown). Thereby, the strand wire coating layer 25 on the outer peripheral wire 11 is scraped off, and a part of the outer peripheral wire 11 is also shaved off. As a result, the stranded wire covering layer 25 remaining between the outer peripheral strands 11 becomes the abrasive grain non-adhesive layer 15, so that the flat surface 11 a and the abrasive grain non-adhesive layer 15 can be formed simultaneously.

  In the latter method, as shown in FIG. 3 (b), the outer periphery of the steel cord 20 is first cut by using means such as a die, a roller, or a brush (not shown), so that the flat surface is first cut. 11a is formed. Thereafter, the entire steel cord 20 including the flat surface 11 a is covered with a resin bond or the like to form a stranded wire covering layer 25. Thereafter, only the stranded wire covering layer 25 covering the flat surface 11a is removed by means such as a die or a brush (not shown). As a result, the stranded wire coating layer 25 remains only between the outer peripheral strands 11 to form the abrasive grain non-adhesive layer 15, so that the flat surface 11 a and the abrasive grain non-adhesive layer 15 are individually formed.

  As a resin bond for forming the stranded wire coating layer 25, for example, a resin bond containing a phenol resin, an epoxy resin, or a polyimide resin is known, but is not particularly limited. The resin bond coating method (application method to the surface of the steel cord 20) is not particularly limited, and a known method can be suitably used. Although not shown in the figure, the steel cord 20 is not coated with a resin material such as resin bond, but the strand itself is coated with a resin material in advance, and the coated strand is twisted to manufacture a stranded wire. May be. Moreover, you may form the strand wire coating layer 25 using materials other than resin. The stranded wire covering layer 25 becomes the abrasive grain non-adhesion layer 15 embedded between the outer peripheral strands 11.

  Thus, the wire saw cord according to the present invention uses a stranded wire such as a steel cord as a core wire, the outer peripheral surface of the outer peripheral wire of the core wire is a smooth flat surface, and the abrasive grains are fixed to the flat surface. . Therefore, compared to a conventional wire saw using diamond beads (see Patent Document 1), the configuration can be simplified and the diameter can be reduced (thinned). Further, if the diameter is approximately the same as that of a conventional wire saw, the diameter of the stranded wire that is the core wire is increased (thickened), so that the strength can be improved.

  Also, among the conventional wire saws, in the type using diamond beads, the diamond beads are arranged at regular intervals on the core wire, whereas the wire saw cord according to the present invention has fine abrasive grains on a flat surface. A large amount is stuck. Therefore, since the “cutting site” contributing to cutting is continuous as compared with the conventional wire saw, the ratio of abrasive grains contributing to cutting can be increased and cutting resistance can be made smaller than before. it can. Also, even if the core wire is broken, there is no possibility that the diamond beads are scattered unlike the conventional wire saw.

  Further, among the conventional wire saws, in the type in which diamond abrasive grains are fixed to the surface of the stranded wire with a plating layer, a plating layer is formed between the strands constituting the stranded wire so that the abrasive grains are fixed. Therefore, since the strands are “bonded” to each other by the plating layer, the movement of the strands due to the curvature of the core wires is hindered, and the flexibility (or flexibility) of the core wires is reduced. Moreover, when the strands move due to the bending of the core wire, the plating layer that “bonds” the strands to each other is damaged, so that abrasive grains may come off from the plating layer and enter between the strands. Thereby, the surface of a strand may be damaged by an abrasive grain, and there exists a possibility of reducing the durability of a core wire.

  On the other hand, in the wire saw cord according to the present invention, if the abrasive grain non-adhering layer described above is provided, the peripheral strands are not “bonded” with the abrasive fixed layer, and can be moved relatively. Therefore, a decrease in the flexibility of the core wire can be avoided, and the possibility that the abrasive grains are detached and enter between the outer peripheral wires can be avoided. Further, since the abrasive grains are not substantially fixed between the outer peripheral wires, the ratio of the abrasive grains contributing to the cutting can be increased. Therefore, the wire saw cord according to the present invention can improve flexibility, flexibility, durability, cutting performance, and the like as compared with the conventional case.

  The cutting object of the wire saw cord according to the present invention, that is, the cutting object that can be cut with the wire saw cord according to the present invention is not particularly limited, and has been conventionally used like stone, concrete, various metal structures, various plastic structures, etc. A cutting object that can be cut with a wire saw can be cut well.

  The present invention will be described more specifically based on examples and comparative examples, but the present invention is not limited to this. Those skilled in the art can make various changes, modifications, and alterations without departing from the scope of the present invention.

(Example)
A 1 + 6 stranded wire was used as the core wire. These were twisted together using one 0.6 mm hard steel wire as the central strand and six 0.5 mm hard steel wires as the outer peripheral strand. Furthermore, the flat surface was formed in the outer peripheral surface of an outer periphery strand by allowing the die | dye with a diameter of 1.40 mm to pass through the twist hole of these strands. This flat surface was 20% or more of the circumference of the outer peripheral wire. Thereby, the strand wire which has a flat surface in the outer periphery, ie, the steel cord with a flat surface, was obtained.

  The entire circumference of the obtained steel cord was coated with a photocurable resin and cured. Thereby, the strand wire coating layer was formed on the steel cord. Thereafter, the resin on the outer flat surface was removed to expose the flat surface. Diamond abrasive grains having a particle size of 20 to 40 μm were fixed on the exposed flat surface by electro nickel plating. Thereby, the wire saw cord of this example was obtained.

  A 25φ bending test was performed in which the obtained wire saw cord of this example was wound around a 25φ cylinder for about 5 weeks. The appearance photograph of the wire saw cord before and after the test is shown in FIG.

(Comparative example)
A wire saw cord of a comparative example was obtained in the same manner as in the above example, except that diamond abrasive grains were fixed without covering the outer peripheral strands with a resin bond. About the obtained wire saw cord of the comparative example, the 25 (phi) bending test was done like the Example. The appearance photograph of the wire saw cord before and after the test is shown in FIG.

(Contrast of Examples and Comparative Examples)
As shown in FIG. 4, in the wire saw cord of this example, diamond abrasive grains are not fixed between the outer peripheral strands, and the number of diamond abrasive grains fixed is also before and after the 25φ bending test. There is no big difference. On the other hand, as shown in FIG. 5, in the wire saw cord of the comparative example, the diamond abrasive grains are fixed between the outer peripheral wires, and the plated layer is broken between the outer peripheral wires after the 25φ bending test. The diamond abrasive grains are detached.

  Therefore, according to the present invention, it is possible to avoid a decrease in the flexibility of the core wire, and to avoid the possibility that the abrasive grains are detached and enter between the outer peripheral wires. Moreover, according to this invention, since an abrasive grain does not adhere substantially between outer periphery strands, the ratio of the abrasive grain which contributes to a cutting | disconnection can be raised.

  It should be noted that the present invention is not limited to the description of the above-described embodiment, and various modifications are possible within the scope shown in the scope of the claims, and are disclosed in different embodiments and a plurality of modifications. Embodiments obtained by appropriately combining the technical means are also included in the technical scope of the present invention.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used widely in the field of wire saws (wire saw cords) in which a stranded wire is used as a core wire and abrasive grains are fixed to the surface.

10 Wire saw cord 11 Outer peripheral wire 11a Flat surface 12 of outer peripheral wire
13 First layer wire (wires other than outer wire)
14 Center wire (wires other than outer wire)
15 Abrasive grain non-adhesion layer (resin layer)
16 Abrasive fixing layer 17 Diamond abrasive (abrasive)
20 Steel cord (stranded wire)
25 Stranded wire coating layer

Claims (5)

A wire saw cord formed by twisting a plurality of strands as a core wire and fixing abrasive grains on the outer peripheral surface of the core wire,
When the wire constituting the outer peripheral surface of the core wire is an outer peripheral wire, the outer peripheral wire has a flat surface on the outer side,
Diamond abrasive grains are fixed to the flat surface of the outer peripheral wire,
Wire saw cord. Between the outer peripheral strands, an abrasive grain non-adhering layer to which the abrasive grains are not fixed is formed,
The wire saw cord according to claim 1. The outer peripheral wire is characterized in that 20% or more of the peripheral length in the cross section of the outer peripheral wire is a flat surface,
The wire saw cord according to claim 1 or 2. The outer peripheral surface of the core wire is composed of three or more outer peripheral wires,
The wire saw cord according to any one of claims 1 to 3. The strand is at least one of a metal wire, a chemical fiber, and a natural fiber,
The material of the abrasive grains is at least one of diamond, boron nitride, alumina, and silicon carbide,
The wire saw cord according to any one of claims 1 to 4.