JP2012082530A - Annular metal cord, endless metal belt having the same and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an annular metal cord capable of maintaining a wound shape without generating twist slackness even for a continuous repetitive load; an endless metal belt having the same; and a method for manufacturing the same.SOLUTION: An annular metal cord C1 is provided, in which an core original cord 13 formed by twisting together a plurality of core strand materials 12 is untwisted, and one of the core strand materials 12 is fitted into a helical space part 5a formed by removing other core strand materials 12 while being formed into an annular shape, to form an annular core 11, and a side wire original cord 14 formed by twisting together at least six side wire strand materials 1 is untwisted, and one of the side wire strand material 1 is annularly wound around the annular core 11 for multiple times and is helically wound around a helical space part 5 formed by removing other side wire strand materials 1.

Description

  The present invention relates to an annular metal cord, an endless metal belt, and a method for producing an annular metal cord.

  Conventionally, as a method of manufacturing an annular metal cord, for example, as described in Patent Documents 1 and 2, half of the strand material constituting the wire rope is removed by untwisting or cutting, and then the remaining strand material is removed. It is known to endlessly wrap around a part of a ring while winding it around.

  The wire rope simple endless processing method described in Patent Document 1 is a wire rope formed by twisting six strands having a length slightly more than twice the inner circumference of the design dimension ring. Prepare. This is separated into two strands of three strands to form a base yarn having an inner circumferential length and a margin slightly longer than the inner circumferential length. Next, by using one of the base yarns composed of the three strands of twisted wires, first, a ring portion that is the basis of the design dimension and a strand portion that extends from the combination portion are formed. In addition, the extending strand portion is wound around the ring portion while being twisted, and endless processing is performed in a state where two base yarns (six strands) are twisted together. Thereafter, the twisted end portion of the base yarn is either locked or half-cage-inserted or a combination of half-cage insert and lock-stop is processed.

  The endless sling described in Patent Document 2 is manufactured as follows. First, a half of the total number of strands is cut out over the entire length of the wire rope of a predetermined length, and a heart rope of 1/2 of the total length of the wire rope is cut out. The both ends of the remaining heart rope are concentrically butted, and the strand on the side where the heart rope is cut is wound around the cut portion of the strand on which the heart rope is not cut to make a concentric endless. Thereafter, the sleeve is compressed over both ends of the cord and the strand.

  The endless ring described in Patent Document 3 forms a ring-shaped part by intersecting a part of the wire rope in a ring shape, and after turning the wire rope around the ring-shaped part a predetermined number of times, the wire rope It is formed by inserting a rope core into the twisted portion of the remaining portion.

  The annular metal cord described in Patent Document 4 is divided into two wire rod groups having different total cross-sectional areas by untwisting a metal cord obtained by twisting a plurality of strand materials, and has a larger total cross-sectional area. A group of strands having a smaller total cross-sectional area as a group of unused wires, and one strand of the group of reused wires being formed into a plurality of loops, The extra length portion is fitted and wound around the spiral void portion from which the other strand material and unused wire group in the reusable wire rod in FIG.

Japanese Patent No. 3069996 JP-A-5-132881 JP 2007-63677 A JP 2009-275338 A

  Each of the annular metal cords described in Patent Documents 1 and 2 is a sling hanging tool, and is not assumed to be used in a manner that repeatedly receives a load such as a predetermined bending or tension. These annular metal cords are obtained by temporarily halving the number of strand materials on the circumference of the wire rope in a cross section and rewinding the remaining strand material in the remaining half space. Therefore, the contact resistance between adjacent strand materials is weak. For this reason, when a load as described above is applied, twisting is likely to occur, and if it is used as it is, it will eventually break.

  Further, since the terminal treatment after the annular winding is a cage insertion or locking by inserting the terminal into the place where the terminal is twisted in Patent Document 1, stress concentration occurs at these places when a repeated load as described above is applied. It breaks early. Moreover, in patent document 2, since both ends are fixed with a sleeve, the code diameter becomes thick only in that portion, and the load becomes uneven in the annular direction. As described above, the annular metal cords described in Patent Documents 1 and 2 do not have a structure that can withstand continuous repeated loads.

  The endless ring, which is an annular metal cord described in Patent Document 3, is wound using the entire wire rope by winding the wire rope a predetermined number of times while twisting around the ring-shaped portion. The pitch varies for each turn, the cord diameter becomes thick, and a uniform strength cannot be obtained in the annular direction. Further, this endless ring is also used for a load lifting operation, and is not assumed to be used in a state where it repeatedly receives loads such as predetermined bending and tension.

  When such an annular metal cord is used for an endless metal belt, the rotational load fluctuates due to the effects of loosening of the twist, the joint portion of the terminal, and the like, and there is a risk of breakage in a relatively short period of time.

  Moreover, since the cyclic | annular metal cord of patent document 4 does not have a cyclic | annular core part, when mass-producing, it is anxious about the dispersion | variation in the cyclic | annular diameter of each cyclic | annular metal cord generate | occur | produced.

  Accordingly, an object of the present invention is to provide an annular metal cord and an endless metal belt capable of maintaining a wound shape without twisting and loosening even with continuous repetitive loads, and capable of suppressing variations in annular diameter. And it is providing the manufacturing method of a cyclic | annular metal cord.

In the annular metal cord according to the present invention that can solve the above-mentioned problems, the core core cord in which a plurality of core strand materials are twisted together is untwisted, and one core strand material is formed into an annular shape. While being inserted into the spiral void portion from which the other strand material for the core is removed, it is formed as an annular core,
A side wire strand material obtained by untwisting a side wire original cord in which at least six side wire strand materials are twisted together is wound around the annular core in a plurality of circles, and a spiral from which other side wire strand materials are removed. It is characterized by being wound in a spiral shape around the gap.

According to the annular metal cord having such a configuration, since the annular core is provided, the annular diameter of the annular metal cord is determined by the annular core, and variation in the annular diameter of each annular metal cord occurs even in mass production. Can be suppressed. Further, an annular core is formed by using one core strand material obtained by untwisting the core core cord, and being fitted into a spiral void portion from which another core strand material is removed. Therefore, the shape of the annular core is easily stabilized by the contact resistance between the core strand materials, and the shape of the annular metal cord is also stabilized.
In addition, a plurality of side wire strand materials are wound around the annular core in a ring shape, and are spirally wound around the spiral void portion from which the other side wire strand material is removed. The shape of the annular metal cord is also stabilized by the contact resistance. Contact resistance between adjacent side wire strand materials is obtained, and the side wire strand materials are constrained over the entire length of the side wire strand material, so that twisting and loosening hardly occur even when a repeated load is applied. Moreover, since a winding state is maintained by the contact resistance between the strand materials for side wires, the terminal treatment can be simplified.

In the annular metal cord according to the present invention, it is preferable that the extra length portions of both ends of the core strand material of the annular core are fitted into and wound around the spiral void portion from which the other core strand material is removed. .
As a result, both end surplus portions of the core strand material are constrained by the contact resistance between the core strand materials, and the winding of the core strand material in the annular core hardly occurs.

In the annular metal cord according to the present invention, it is preferable that a part of the core strand material of the annular core is a resin fiber.
By including resin fibers in the core strand material, the frictional resistance of the core strand material in the annular core increases, and even when tensile tension is applied to the annular core, the core strand material slips and loosens the winding. Can be prevented. Moreover, since the frictional resistance between the annular core and the side wire strand material is increased, the shape of the annular metal cord is also stabilized.
The resin fiber is more preferably an aramid fiber. By using an aramid fiber, the tensile strength is also good.

In the annular metal cord according to the present invention, it is preferable that the twisting direction of the core strand material of the annular core and the side wire strand material is the same direction.
Thereby, when the extra length of the side wire strand material spirally wound around the annular core is fitted and accommodated from the spiral gap between the side wire strand materials toward the annular core, the core is used. It can be fitted along the twisting direction of the strand material, and the shape of the fitted part is easy to be stabilized.

The endless metal belt according to the present invention preferably includes the annular metal cord according to the present invention.
By using the above-mentioned annular metal cord, the endless metal belt excellent in breaking strength and fatigue resistance can be maintained because the shape of the annular metal cord can be maintained without twisting and loosening even with continuous repeated loads. Obtainable. Furthermore, since there is little variation in the annular diameter of individual annular metal cords, when using an endless metal belt using a plurality of annular metal cords, variation in load is suppressed to a low level, and stable belt travelability is obtained. Long service life can also be achieved.

Moreover, the manufacturing method of the cyclic | annular metal cord which concerns on this invention which can solve the said subject untwists the core original cord by which the strand material for several cores was twisted together, and one said strand material for cores Is formed into an annular core by being fitted into a spiral void portion from which other core strand materials are removed while being annular.
A side wire strand material obtained by untwisting a side wire original cord in which at least six side wire strand materials are twisted together is wound around the annular core in a plurality of circles, and a spiral shape from which other side wire strand materials are removed. It is characterized in that it is wound in a spiral shape around the gap portion.

According to the manufacturing method of the annular metal cord having such a configuration, since the annular core is provided, the annular diameter of the annular metal cord is determined by the annular core, and variation in the annular diameter of individual annular metal cords even in mass production Can be prevented from occurring. In addition, since one core strand material obtained by untwisting the core original cord is inserted into the spiral void portion from which the other core strand material is removed, an annular core is formed. The shape of the annular core is easily stabilized by the contact resistance between the core strand materials, and the shape of the annular metal cord is also stabilized.
Also, around the annular core, a plurality of side wire strand materials are wound in a ring shape and wound in a spiral space where other side wire strand materials are removed, so that the contact resistance between the side wire strand materials The shape of the annular metal cord is also stable. Contact resistance between adjacent side wire strand materials is obtained, and the side wire strand materials are constrained over the entire length of the side wire strand material, so that twisting and loosening hardly occur even when a repeated load is applied. Moreover, since a winding state is maintained by the contact resistance between the strand materials for side wires, the terminal treatment can be simplified.

  According to the present invention, an annular metal cord, an endless metal belt, and an annular metal that can maintain a wound shape without causing twist loosening even for continuous repeated loads, and can also suppress variation in the annular diameter. A method for manufacturing a code can be provided. Therefore, when the annular metal cord and the endless metal belt of the present invention are used in an industrial machine, the industrial machine can be excellent in durability and high quality.

It is a perspective view of the annular metal cord concerning this embodiment. (A) is sectional drawing of the radial direction which shows a cyclic | annular metal cord, (b) is a side view of a cyclic | annular metal cord. It is sectional drawing of the radial direction which shows the location where the extra length part of the strand material for side wires in a cyclic | annular metal cord was accommodated. It is a figure which shows the original cord for cores used for manufacture of a cyclic | annular metal cord, (a) is sectional drawing of radial direction, (b) is a side view. It is a perspective view which shows the strand material taken out from the original cord for cores of FIG. It is the schematic which shows one process which forms an annular core from the strand material for cores. It is a figure which shows the original cord for side lines used for manufacture of a cyclic | annular metal cord, (a) is sectional drawing of radial direction, (b) is a side view. It is the schematic which shows the process of winding the strand material for side lines around the annular core. It is the schematic which shows the process in which the both extra length parts of the strand material for side wires are accommodated. It is a perspective view which shows the use condition of the endless metal belt which concerns on this embodiment. It is a schematic block diagram which shows the durability test apparatus of a cyclic | annular metal cord.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description, the same reference numerals are used for the same elements or elements having the same function, and redundant description is omitted.

FIG. 1 is a perspective view of an annular metal cord according to the present embodiment, FIG. 2A is a radial sectional view showing the annular metal cord, and FIG. 1B is a side view of the annular metal cord. .
As shown in FIGS. 1 and 2, the annular metal cord C1 is formed by twisting a plurality of strand materials into a ring shape, and a strand for side wires in which a plurality of metal strands are twisted in advance as a strand material. Material 1 is used.

  The annular metal cord C1 of the present embodiment prepares one side wire strand material 1 that is preliminarily spiraled, and this side wire strand material 1 is attached to the annular core 11 (see FIG. 2A). A plurality of turns (6 turns in this example) are wound around the periphery. The twist direction of winding is, for example, Z twist. When the annular metal cord C1 is viewed in a cross section in the radial direction of the side wire strand 1, the six side wire strand materials 1 are arranged in a circumferential shape, and the core strand material 12 of the annular core 11 is accommodated inside thereof. Have a structure.

In each side wire strand material 1, seven metal strands 10 are twisted in the S twist direction (under twisted) to form a strand material 10a, and the strand material 10a is twisted in the S twist direction ( Medium twisted).
The metal strand 10 is made of, for example, a high carbon steel wire containing 0.7% by mass or more of carbon (C). By selecting a material containing 0.70% by mass or more of C, the metal wire 10 can be made a steel wire having more excellent breaking strength. Further, the surface of the metal strand 10 may be subjected to a copper alloy (for example, brass) or zinc plating treatment. In addition, the material of the metal strand 10 is not restricted to the said thing, For example, a piano wire may be sufficient.

Moreover, the diameter of the metal strand 10 exists in the range of 0.03 mm or more and 0.30 mm or less.
By forming the side wire strand material 1 with the metal strand 10 having a diameter of 0.03 mm or more and 0.30 mm or less, and adjusting the diameter molding rate of the side wire strand material 1 to an extent suitable for the diameter of the metal strand 10. Thus, the strand material 1 for a side wire having a flexible and appropriate spiral shape can be obtained. Therefore, winding of the strand material 1 for side wires becomes easy, and winding looseness after winding becomes difficult to occur.

  It should be noted that the diameter ratio is the cross-sectional diameter of the annular metal cord C1 (one side wire strand material 1 is fitted into a plurality of circumferential gaps, and six side wire strand materials 1 are arranged in a circumferential shape. Assuming that the diameter of the cross section (D) is D and the wave height (including the self-diameter) of the shaped strand material 1 for side wires is H, it is expressed by “Diameter ratio (%) = H / D × 100”.

  The side wire strand materials 1 are wound in the opposite direction to the Z twist, that is, the twist direction of the metal strand 10 constituting the side wire strand material 1. That is, the strand material 1 for side wires is preliminarily attached in a spiral shape in the Z twist direction. On the other hand, since the strand material 1 for the side wire itself has a structure in which the strand material 10a obtained by S-twisting the metal strand 10 is further S-twisted, the annular metal cord C1 is a combination of the S / S twist structure and the Z-winding structure. Become. If the twist direction of the metal strand 10 and the winding direction of the strand material 1 for the side wires are reversed, the occurrence of directivity in the mechanical properties of the annular metal cord C1 is suppressed, and it is difficult to twist and the surface appearance is uneven. A small number of annular metal cords C1 can be obtained. Further, even when the annular metal cord C1 is used while being rotated along the annular direction, it becomes difficult to meander.

  Further, the side wire strand material 1 is wound at a predetermined winding angle with respect to six twisted central axes arranged on the outer periphery of the annular metal cord C1. For this reason, the strand material 1 for side wires can be wound without disorder | damage | failure, and the cyclic | annular metal cord C1 with a substantially uniform surface state can be obtained. In the present embodiment, as shown in FIG. 2B, the winding angle θ of the side wire strand material 1 with respect to the X direction, that is, the direction in which the central axis of the annular metal cord C1 extends is 4.5 degrees or more and 17.0. It is below the degree. When the winding angle θ is 4.5 degrees or more, the side wire strand material 1 is hardly loosened. By setting the winding angle θ to 17.0 degrees or less, it is possible to prevent the elongation of the side wire strand material 1 from becoming excessively large. That is, by setting the winding angle θ of the side wire strand material 1 to 4.5 degrees or more and 17.0 degrees or less, it is possible to obtain a flexible annular metal cord C1 having an appropriate elongation.

  For the annular core 11, a single strand material 12 for a core which is preliminarily spirally wound is prepared, and the strand material 12 for a core is wound once or twice (one turn in this example) with a predetermined annular diameter. After that, the extra length portions at both ends are fitted and wound around the spiral void portion of the core strand material 12 in the annular portion. The annular core 11 is wound so that the extra length of the core strand material 12 enters the spiral void of the core strand material 12 itself, and thus the annular diameter is stabilized to a predetermined dimension.

The core strand material 12 constituting the annular core 11 is formed by twisting a plurality of metal strands. For example, three strand materials 12b obtained by twisting three metal strands 12a are prepared. These three are twisted together.
The metal strand 12a constituting the core strand material 12 can be made of the same material as the side wire strand material 1, and the wire diameter can be the same or slightly different.

  A part of the strands constituting the core strand material 12 may be made of resin fibers. For example, one strand material 12b may be replaced with a bundle of resin fibers. By including resin fibers in the core strand material 12, the frictional resistance of the core strand material 12 in the annular core 11 increases, and even if tensile tension is applied to the annular core 11, the core strand materials 12 slip and wrap around each other. Can be prevented from loosening. Moreover, since the frictional resistance between the annular core 11 and the side wire strand material 1 increases, the shape of the annular metal cord C1 is also stabilized. An example of the resin fiber used for the core strand material 12 is an aramid fiber. Use of an aramid fiber is preferable because the tensile strength is good and the frictional resistance with the other strand material 12b and the side wire strand material 1 is increased.

FIG. 3 is a cross-sectional view of a portion where the extra length portion of the side wire strand material 1 is accommodated inside the side wire strand material 1.
Since the annular core 11 is formed by making the core strand material 12 attached in a spiral shape into an annular shape, the annular core 11 has a spiral shape along the annular direction and a spiral void portion. The extra length portions at both ends of the side wire strand material 1 wound around the annular core 11 are dropped into the gap of the annular core 11 from the gap between the wound side wire strand materials 1, and together with the annular core 11. Housed inside. In that case, it is preferable that the twist direction of the core strand material 12 of the annular core 11 and the side wire strand material 1 is the same direction. For example, the strand material 1 for the side wires is preliminarily kneaded in a spiral shape in the Z-twist direction. It is good to be. Thereby, the extra length of the strand material 1 for the side wires wound around the annular core 11 in a spiral manner is fitted into the annular core 11 from the spiral gap between the strand materials 1 for the side wires and accommodated. At this time, the core strand material 12 can be fitted along the twist direction, and the shape of the fitted portion can be easily stabilized.

  At the place where the extra length portions at both ends of the side wire strand material 1 are dropped into the gap portion of the annular core 11, the extra length portions of the side wire strand material 1 are respectively spiraled so as to enter the gap portion of the annular core 11. It is straightened and stretched so that the height of the attached wave becomes small. Moreover, after one of the two extra length portions is wound around the other two times, it is dropped into the gap of the annular core 11. As a result, the contact resistance between the side wire strand materials 1 and between the side wire strand materials 1 and the annular core 11 is increased and held strong, and the excess length portions are prevented from coming off.

For example, the annular metal cord C1 may be annealed at about 280 ° C. for 10 minutes in a reduced pressure environment.
In addition, an adhesive resin may be applied to the boundary between the side line strand materials 1 over the entire annular direction of the annular metal cord C1. Thereby, since the strand material 1 for side wires can be hold | maintained so that it may not move not only by contact resistance but also by the adhesive force of resin, it becomes difficult to produce twist loosening, and a shape becomes stable. The adhesive resin is made of a material that can be expanded and contracted in response to the elastic deformation of the annular metal cord C1 even after curing.

Then, the manufacturing method of the cyclic | annular metal cord C1 is demonstrated.
4A and 4B are views showing a core core cord prepared for manufacturing the annular metal cord C1, where FIG. 4A is a sectional view in the radial direction and FIG. 4B is a side view.
As shown in FIG. 4, the metal cord (core core cord) 13 is composed of four core strands obtained by twisting three strands 12 b made of S-twisted metal strands 12 a with three S strands. The material 12 has a twisted wire structure in which the material 12 is twisted (up-twisted). The upper twist direction is Z twist.

  The core strand material 12 of the metal cord 13 is used to configure the annular core 11 of the annular metal cord C1. When these four core strand materials 12 are twisted to form a metal cord 13, they are spirally shaped at a diameter shaping rate corresponding to the diameter of the metal strand 12a constituting the core strand material 12. Keep it.

Such a metal cord 13 is untwisted and divided into each core strand material 12, and one annular core 11 is manufactured using one of the core strand materials 12. Resin fibers may be included in a part of the core strand material 12 to be used.
As shown in FIG. 5, one core strand material 12 taken out from the metal cord 13 has a spiral gap 5 a formed at a location where the other core strand material 12 was present. The gap 5 a has a total cross-sectional area of the cross-sectional areas of the other three core strand materials 12 for the metal cord 13.

  As shown in FIG. 6 (a), one core strand material 12 is formed into an annular shape (or two circular shapes), and the extra length portions 12c at both ends are wound around the spiral void portion 5a of the annular portion. The annular core 11 is inserted. FIG. 6B is a cross-sectional view of a portion where the surplus portion 12c is not fitted (a portion indicated by arrow b), and FIG. 6B is a cross-sectional view of a portion where the surplus length portion 12c is fitted (a portion indicated by arrow c). 6 (c). As shown in FIG. 6 (b), in the portion where the extra length portion 12 c in the annular core 11 is not fitted, there is only one core strand material 12 as viewed in cross section, and it is twisted together at the time of the metal cord 13. The other three core strand materials 12 have gaps 5a. Moreover, as shown in FIG.6 (c), in the location which inserted the extra length part 12c in the cyclic | annular core 11, there are two core strand materials 12 seeing in cross section, and an extra length part is formed in a part of space | gap part 5a. 12c is arranged. Since the annular core 11 formed in this way is formed into a ring shape by winding one core strand material 12 in a spiral shape, the shape such as the ring diameter is stable.

FIGS. 7A and 7B are diagrams showing a side wire original cord prepared for manufacturing the annular metal cord C1, where FIG. 7A is a sectional view in the radial direction, and FIG. 7B is a side view.
As shown in FIG. 7, the metal cord (side wire original cord) 14 is composed of eight strands for side wires formed by twisting seven strands 10a made of S strands of metal strands 10 with seven S strands. The material 1 has a stranded wire structure in which a temporary core strand material (temporary core material) 15 is twisted (up-twisted). The upper twist direction is Z twist. The temporary core strand material 15 is larger in diameter than the side wire strand material 1 and has, for example, a structure in which seven strand materials formed by twisting seven metal strands are twisted together.

  The strand material 1 for the side wire of the metal cord 14 is used to configure the annular metal cord C1. When these eight side wire strand materials 1 are twisted to form a metal cord 14, they are spirally shaped at a diameter shaping rate corresponding to the diameter of the metal strand 10 constituting the side wire strand material 1. Keep it.

  When the diameter of the metal strand 10 is 0.03 mm or more and 0.14 mm or less, the strand diameter can be made supple by making the wire diameter as thin as possible. In that case, the rigidity of the side wire strand material 1 is reduced, so that the diameter die forming rate of the side wire strand material 1 can be increased. On the other hand, if tension is applied during twisting, etc. Easy to return. For example, since the molding is performed by passing between the cylindrical pins arranged in a staggered manner, if the diameter molding rate is forcibly increased in anticipation that the molding is easy to return, the frictional force between the cylindrical pins and the strand material 1 for the side wire is increased. Accordingly, the straightness of the side wire strand material 1 in the state of being molded cannot be maintained. Even if the annular metal cord C1 is produced using such a side wire strand material 1, twisting of the side wire strand materials 1 is not stable, which is not preferable. When the diameter of the metal strand 10 is 0.14 mm or less, when the metal cord 14 is manufactured, the absolute value of the height of the spiral undulation of the side wire strand material 1 is increased as shown in FIG. Further, the diameter D2 of the core strand is increased from the diameter D3 of the strand material 1, and accordingly, the number of the side wire strand materials 1 is increased by at least one from the time when the ring metal coding is performed (in FIG. 7, it is increased by two). ) By making the diameter mold rate of the side wire strand material 1 91% or less, it is easy to maintain straightness and make it difficult to return the mold. Moreover, when the diameter molding rate is set to 70% or more, it is not difficult to fit one of the side wire strand materials 1 around the annular core 11 into the spiral space of the spiral wire 11 a plurality of times. A certain degree of spiral shape is secured.

  Therefore, in the case where the diameter of the metal strand 10 is 0.03 mm or more and 0.14 mm or less, in the production of the metal cord 14, the diameter of the temporary core material to be used is increased, and the side wire strand material 1 After increasing the number, it is preferable to set the diameter shaping rate of the side wire strand material 1 to be applied to about 80%. Thus, when the side wire strand material 1 is taken out by untwisting the metal cord 14 of FIG. 7, the height of the spiral corrugation (including the self-diameter) of the side wire strand material 1 exceeds the cross-sectional diameter of the annular metal cord C1. It will be about.

  When the diameter of the metal strand 10 is 0.15 mm or more, the rigidity of the side wire strand material 1 can be maintained well, and the annular metal cord C1 can withstand deformation. Moreover, since the diameter of the metal strand 10 is 0.30 mm or less, the rigidity of the strand material 1 for side wires does not need to be excessively increased. Therefore, the annular metal cord C1 can make it difficult for fatigue fracture due to repeated bending stress.

  When the diameter of the metal wire 10 is 0.15 mm or more and 0.30 mm or less, since the metal cord 14 is relatively easy to mold, the diameter-setting ratio of the side wire strand material 1 is likely to exceed 100%. .

  In addition, the number of the side wire strand materials 1 in the metal cord 14 is equal to the twisted structure of the side wire strand material 1 including the metal strand diameter and the side wire strands necessary for the annular metal cord C1 according to the use of the annular metal cord C1. The number of the materials 1 is determined, and is determined from the diameter shaping rate of the side wire strand material 1 provided to the annular metal cord C1. When the metal wire diameter is relatively thin and the diameter molding rate cannot be increased, in addition to increasing the diameter of the temporary core material to be used, the number of the side wire strand materials 1 of the metal cord 14 is changed to the annular metal cord C1. More than the necessary number of turns of the strand material 1 for the side wire. When the metal wire diameter is relatively large and the diameter molding rate can be increased, the number of the side wire strand materials 1 of the metal cord 14 is the same as the number of turns of the side wire strand material 1 required for the annular metal cord C1. Or less than the number of laps. It is preferable to adjust the diameter shaping rate of the side wire strand material 1 in the state of the annular metal cord C1 to be 101% or more.

Such a metal cord 14 is untwisted and divided into the side wire strand materials 1, and one annular metal cord C 1 is manufactured using one of the side wire strand materials 1.
The temporary core material of the metal cord 14 does not constitute the annular metal cord C1. Therefore, a single monofilament of mild steel material having the same diameter may be used as the temporary core material instead of the temporary core strand material 15.

  And the one strand material 1 for side wires taken out from the metal cord 14 as mentioned above is the place where the other strand material 1 for side wires existed similarly to the core strand material 12 shown in FIG. A spiral gap 5 is formed. The gap portion 5 has a total cross-sectional area of the cross-sectional area of the hollow portion (part of the temporary core material) at the center of the metal cord 14 and the other seven side wire strand materials 1.

  Next, as shown in FIG. 8, the side wire strand material 1 is wound around the annular core 11 in a plurality of rounds (six rounds). First, the length of the side wire strand material 1 is wound around the annular core 11 while making the length of about 1/6 of the length of the side wire strand material 1, and the side line is inserted into the spiral gap 5 of the side line strand material 1 in the annular portion 1d. The extra length portion 1e of the strand material 1 is inserted, and is further wound around a plurality of rounds (five rounds). In addition, it is good for the starting end part 1f of winding of the strand material 1 for side wires to make it straighten and extend so that the height of the wave previously hung up spirally may become small. The gap portion 5 in the side wire strand material 1 varies depending on the diameter forming rate of the metal strand 10, but the extra length portion 1 e of the side wire strand material 1 wound in a ring shape around the circumference is around the annular core 11. 1 is fitted into the gap 5 of itself. The adjacent extra length portions 1e of the wound side wire strand material 1 are in close contact with each other in the radial direction or are arranged with a slight gap.

  Further, after the side wire strand material 1 is wound around the annular core 11 a predetermined number of times, as shown in FIG. 9, the extra length portion 1e and the start end portion 1f of the side wire strand material 1 are annularly wound. The side wire strand material 1 is fitted into the inner space (the gap of the annular core 11). At that time, one of the two surplus length portions (the surplus length portion 1e and the start end portion 1f) is wound around the other two times, and then the surplus length portion 1e and the start end portion 1f are pulled. If it does in this way, the force which straightens the wound location will act, and the wound location will be dropped in the crevice part of annular core 11. Also, the starting end 1f may be straightened and extended. As a result, the contact resistance between the side wire strand materials 1 and between the side wire strand material 1 and the annular core 11 is increased and held strong, and the excess length portion 1e and the start end portion 1f are prevented from coming off.

  In addition, the number of windings of the extra length portion 1e and the start end portion 1f may be one, but the winding portion is steeply angled from the space between the side wire strand materials 1 that are wound twice or more (inside space ( The contact resistance with the side-strand strand material 1 spirally wound around and entering the void portion of the annular core 11 is increased and is strongly retained, and the disconnection is reliably prevented.

  After dropping the winding portion into the gap of the annular core 11, the extra lengths (the extra length portion 1e and the starting end portion 1f) of both ends protruding from between the side wire strand materials 1 are used as the side wire strand material. The wire is pushed along the gap between the annular cores 11 while being moved along the annular shape while being wound along the gap between them. At this time, since the surplus length portion 1e and the start end portion 1f are stretched and substantially straightened, they can be easily inserted into the gap. Then, when the extra length portion 1e and the start end portion 1f are inserted into the gap between the side line strand materials 1 in this way, the extra length portion 1e and the start end portion 1f are formed inside the six side line strand materials 1. The annular core 11 is inserted into the gap. In addition, the cross section of the location which dropped the surplus length part 1e and the start end part 1f into the space | gap part of the annular core 11 is shown in FIG. 3, and the cross section of the other location is shown in FIG. 2 (a).

  Moreover, since the winding location enters the inner space from between the side wire strand materials 1, the location where the start end portion 1 f and the extra length portion 1 e of the side wire strand material 1 are wound is convex on the outer periphery of the annular metal cord C 1. There is no remaining. If the winding locations of both ends remain convex, there is a risk that the load will be concentrated there in a usage state where repeated bending is applied and there will be a problem that durability will be reduced. Since there is no convex portion, such a problem does not occur, and it has uniform characteristics in the annular direction and good durability.

  As described above, the annular metal cord C <b> 1 is formed by winding the side wire strand material 1 around the annular core 11, and thus the annular diameter thereof is determined by the annular core 11. Therefore, even when the annular metal cord C1 is mass-produced, it is possible to suppress the occurrence of variations in the annular diameters of the individual annular metal cords C1. In addition, one core strand material 12 obtained by untwisting the metal cord 13 is used to form the annular core 11 by fitting into the spiral gap 5 from which the other core strand material 12 is removed. Therefore, the shape of the annular core 11 is easily stabilized by the contact resistance between the core strand materials 12, and the shape of the annular metal cord C1 is also stabilized.

  Further, the side wire strand material 1 is wound around the annular core 11 in a ring shape and wound around the spiral gap 5 from which the other side wire strand material 1 is removed. The shape of the annular metal cord is also stabilized by the contact resistance between them. Contact resistance between adjacent side wire strand materials 1 is obtained, and the side wire strand materials 1 are constrained over the entire length of the side wire strand material 1, so that twisting and loosening hardly occur even when a repeated load is applied. Moreover, since a winding state is maintained by the contact resistance of the strand materials 1 for side wires, terminal processing can be simplified. As described above, according to this embodiment, the side wire strand material 1 is not twisted and loosened even with continuous repeated loads, and the shape of the side wire strand material 1 wound around can be maintained. Can be easily manufactured.

  Moreover, since the side wire strand material 1 is not a single wire but a wire material obtained by twisting a plurality of metal strands 10, contact resistance between the side wire strand materials 1 is increased due to the unevenness of the surface of the side wire strand material 1. Further, twist loosening is less likely to occur. Moreover, since the flexibility of the annular metal cord C1 is improved and a uniform load is easily applied to an external force, it is possible to suppress a decrease in breaking strength.

  Further, the side wire strand material 1 is provided with a spiral mold in the Z twist direction in the state of the metal cord 14. Therefore, the side wire strand materials 1 are wound in the opposite direction to the Z twist, that is, the twist direction (S / S twist structure) of the metal strand 10 constituting the side wire strand material 1. That is, the annular metal cord C1 is a combination of the S / S twist structure and the Z-winding structure. Since the twisting direction of the metal strand 10 and the winding direction of the strand material 1 for the side wires are opposite, the occurrence of directivity is suppressed in the mechanical properties of the annular metal cord C1, and the surface appearance is uneven. A small number of annular metal cords C1 can be obtained. Further, even when the annular metal cord C1 is used while being rotated along the annular direction, it becomes difficult to meander.

  Moreover, in the said embodiment, although the cyclic | annular metal cord C1 was manufactured using one of the eight side wire strand materials 1 which comprise the metal cord 14, the remaining seven each strand material 1 for side wires. Similarly, as described above, the annular metal cord C1 may be manufactured by winding a plurality of circumferences around the annular core 11 in a ring shape. Thereby, economic efficiency can be improved. Similarly, the annular core 11 may be manufactured by using the remaining three of the four core strand materials 12 constituting the metal cord 13, respectively.

  In addition, although the said embodiment illustrated and demonstrated the case where the number of the strand material 1 for side lines in the cross section of the cyclic | annular metal cord C1 was six, the strand material 1 for side lines in a cross section is not limited to six. The configuration of the side wire strand material 1 can also be changed as appropriate.

  Next, an example of an endless metal belt provided with the annular metal cord C1 having the above-described configuration will be described. FIG. 10 is a schematic perspective view showing a use state of the endless metal belt according to the present embodiment.

  The endless metal belt B1 is used for a reduction gear 30 used in precision equipment and other industrial machines as shown in FIG. 10, for example. The endless metal belt B1 is composed of three annular metal cords C1 arranged in parallel, and bears power transmission between the small-diameter driving pulley 32 and the large-diameter driven pulley 34. A drive shaft of a drive motor 36 is connected to the rotation center of the drive pulley 32. Circumferential grooves are formed on the outer circumferences of the driving pulley 32 and the driven pulley 34 so that the respective annular metal cords C1 are stably routed. The endless metal belt B1 is connected to the driving pulley 32 and the driven pulley 34. As a result, the rotational force of the driving pulley 32 is transmitted to the driven pulley 34 via the endless metal belt B1. At this time, the rotational speed of the driving pulley 32 is reduced by the driven pulley 34, and the torque of the driving pulley 32 is increased by the driven pulley 34. The driven pulley 34 is axially connected to, for example, another pulley (not shown) and transmits power.

  The annular metal cord C1 has a very high breaking strength as described above. Further, a single strand material 1 for side wires is wound around the annular core 11 in a plurality of circles, and is also spirally wound around the spiral gap 5 from which the other strand material 1 for side wires is removed. Therefore, there is no convex portion on the outer periphery, and the winding of the annular metal cord C1 itself is eliminated by winding it around the pulleys 32 and 34. That is, since rotation does not occur, fatigue can be suppressed, and variation in the annular diameter for each annular metal cord C1 is suppressed by the annular core 11, so that variation in load is suppressed and stable. The running property of the belt can be obtained, and the life can be extended. In addition, when annealing is performed, the processing strain at the time of twisting of the side wire strand material 1 can be removed, and the durability can be further improved.

  In the endless metal belt B1 of the present embodiment, three annular metal cords C1 are stretched over the driving pulley 32 and the driven pulley 34. However, the number of annular metal cords C1 to be spanned is as follows. It is not limited to this. The number of the annular metal cords C1 can be adjusted according to the required driving force or belt tension.

  In the present embodiment, the annular metal cord is applied to an endless metal belt that transmits power in a reduction gear. However, the annular metal cord of the present invention is also applicable to an endless metal belt that is used other than the reduction gear. Can be applied. For example, an endless metal belt responsible for power transmission between paper feed rollers in a printer such as a printer, an endless metal belt responsible for direct drive of a single-axis robot, an endless metal belt responsible for driving an XY table mechanism or driving a three-dimensional carriage Applicable to metal belts, endless metal belts responsible for precision driving in optical instruments and inspection machines, measuring instruments, endless metal belts responsible for power transmission between driving pulleys and driven pulleys in continuously variable transmissions for automobiles, etc. Is possible.

Next, examples of the annular metal cord according to the present invention will be described.
An annular metal cord according to the present invention manufactured as in the above embodiment was used as an example, and an annular metal cord without an annular core was used as a comparative example for a durability test. Moreover, the dispersion | variation in each annular diameter was also measured.

(1) Production of 3 × 3 × 0.09 + 6 × 7 × 7 × 0.08 annular metal cord (production of core cord)
After a 3.8 mm diameter wire rod for steel cord application is pickled, it is drawn to a diameter of 1.8 mm with a dry wire drawing machine, heated, patented, and pickled, then dry drawn again. The wire is drawn to a diameter of 0.55 mm using a machine. After reheating, patenting, pickling and rinsing, the metal wire drawn to a diameter of 0.09 mm is wound on 3 reels, supplied again, and twisted 7.5 mm using a buncher type twisting machine. Twist with S twist at the pitch. A predetermined amount of this 3 × 0.09 wire is wound up on three reels, supplied again, and twisted with an S twist at a 6.5 mm twist pitch using a buncher type twist wire machine. In the case of bunch twisting, the diameter can be adjusted to about 93% without using a preform device. Four reels are prepared by winding a predetermined amount of this strand material. A 4 × 3 × 3 × 0.09 core raw material is obtained by twisting a predetermined amount by Z-twisting at a 15.0 mm twist pitch using a buncher-type twisted wire machine that can twist four 4-reel strands. Code.

(Production of annular core)
One of the four core strand materials obtained by untwisting the core core cord is used to form, for example, an annular diameter of 200 mm in diameter, and then the spiral gap in the annular portion The extra length 12c at both ends is wrapped around and fitted into the portion 5a to form the annular core 11.

(Production of strand material for side wires)
Similar to the production of the core strand material, the wire drawn to a diameter of 0.55 mm from the wire material used for the steel cord is reheated, patented, pickled, washed with water, and then subjected to brass plating (copper plating, galvanization, Alloyed by heat diffusion) to obtain a brass-plated steel wire having a diameter of 0.55 mm. This is drawn to a diameter of 0.08 mm by a wet wire drawing machine to form a metal strand (for side wire strand material), and 7 reels are prepared by winding a predetermined amount of this. This metal element wire having a diameter of 0.08 mm is subjected to under-twisting (child-twisting) with S-twisting at a 3.0-mm twisting pitch using a tubular twisting machine capable of seven strands (1 + 6 configuration). At this time, the preform apparatus is adjusted in advance so that the diameter molding rate is about 87%. Seven reels having a predetermined amount of the strand material wound thereon are prepared. Using a twisted strand material that has been twisted 7 strands, using a tubular twisted wire machine that can twist 7 strands (1 + 6 configuration), twist it in an S twist with a twist pitch of 9.0 mm (parent twist). A strand material for side wires is used. At this time, the preform apparatus is adjusted in advance so that the diameter molding rate is about 87%. Eight reels prepared by winding a predetermined amount of the strand material are prepared.

(Preparation of temporary core material for side cords)
The wire drawn to a diameter of 0.55 mm is drawn to a diameter of 0.145 mm by a wet wire drawing machine to form a metal strand, and 7 reels are prepared by winding a predetermined amount. This metal element wire having a diameter of 0.145 mm is subjected to under-twisting (child-twisting) with S-twisting at a twisting pitch of 4.5 mm using a tubular twisted wire machine capable of seven strands (1 + 6 configuration). At this time, the preform apparatus is adjusted in advance so that the diameter molding rate is about 87%. Seven reels having a predetermined amount of the strand material wound thereon are prepared. Using a twisted strand material that has been twisted 7 strands, using a tubular twisted wire machine that can perform 7 strands (1 + 6 configuration), the strands are twisted in the S twist at a 14 mm twist pitch (parent twist). Use core material. At this time, the preform apparatus is adjusted in advance so that the diameter molding rate is about 87%.

(Preparation of original cords for side wires)
Twist pitch of 22.0 mm using a tubular twisted wire machine capable of nine strands (1 + 8 configuration) using one reel of the above temporary core material (parent twist) and eight reels of side wire strand material (parent twist). Then, a predetermined amount is twisted by Z twisting to obtain a side wire original cord of 1 × 7 × 7 × 0.145 + 8 × 7 × 7 × 0.08. In addition, it adjusts to the diameter shaping | molding rate of about 89% in advance using a preform apparatus.

(Production of ring metal cord)
After cutting the twisted side wire original cord with a length of about 26 times ((Di) π × 6 + α) of the necessary annular metal cord diameter (layer core diameter: Di) including the extra length α , Untwisting over the entire length and separating into strand materials for each side wire. And while moving the untwisted side wire strand material (7 × 7 × 0.08) around the annular core (3 × 3 × 0.09) 6 times, other side wire strand materials themselves An annular metal cord is formed so as to fill the void from which the side wire strand material is removed.

(Terminal processing)
Re-cut leaving the necessary length of the winding start end of the side wire strand material wound around the annular core and the terminal end surplus length of the winding, so that the spiral shape overlaps the start end and surplus end as much as possible Straighten and pull one of the two ends around the other at the point where the ends intersect each other, pull the winding part into the space between the side line strand materials with the annular core from between the side line strand materials Contain.

  A 1 × 3 × 3 × 0.09 + 6 × 7 × 7 × 0.08 annular metal cord produced in this way is taken as an example. Moreover, what produced the 6x7x7x0.08 cyclic | annular metal cord without the cyclic | annular core is made into a comparative example.

(2) Durability Test (2-1) Durability Test Device FIG. 11 shows a durability test device. As shown in FIG. 11, the durability test apparatus includes a drive pulley 52 that is rotated by a drive motor 51, a driven pulley 53 that is supported to be movable toward and away from the drive pulley 52 in the horizontal direction, and a driven pulley 53. And a tension applying portion 54 that applies a load in a direction in which the roller is separated from the drive pulley 52. The diameters of the driving pulley 52 and the driven pulley 53 when testing the annular metal cords of the above examples and comparative examples were 23.9 mm (diameter 25.0 mm at the center of the suspended annular metal cord).

  The tension applying unit 54 includes a weight 56 attached to the driven pulley 53 via a rope 55 and a pulley 57 on which the rope 55 is hung. The driven pulley 53 is separated from the driving pulley 52 by the load of the weight 56. The In the tension applying portion 54, the weight 56 is adjusted so that the applied tension is 19.5 kg (around 5% of the cord strength).

(2-2) Durability Test Method Each annular metal cord is wound around the drive pulley 52 and the driven pulley 53 of the durability test apparatus described above, the drive pulley 52 is rotated at 3500 rpm, and repeatedly bent to the annular metal cord. Stress was applied, and the presence / absence of defects such as cutting and slacking of the annular metal cord, breakage of the wire (elementary wire), and the number of times of endurance (converted number) until the defect occurred were evaluated.

(2-3) Durability Test Results Durability test results on the annular metal cords of the above examples and comparative examples are shown in the following table.

  As shown in Table 1, in both the examples and the comparative examples, the number of times of repeated bending that can be endured was extremely large, and the start and end portions of the side wire strand material did not protrude.

(3) Dimensional stability of cord annular diameter For the annular metal cords of Examples and Comparative Examples, 20 samples each having an annular diameter of 200 mm were prepared, and fitted to a truncated cone to measure the cord annular diameter. The standard deviation was examined. The measurement results are shown in Table 2.

  As shown in Table 2, the average cord annular diameter in the example was closer to the target diameter of 200 mm than the comparative example, and the cord annular diameter standard deviation was smaller in the example than in the comparative example. In other words, it was confirmed that the example having the annular core can easily obtain a desired annular diameter, and the variation in the annular diameter is smaller.

  1: Strand material for side wire, 5, 5a: Cavity, 11: Ring core, 12: Strand material for core, 13: Original cord for core, 14: Original cord for side wire, B1: Endless metal belt, C1: Ring metal code

Claims (7)

A core core cord in which a plurality of core strand materials are twisted together is untwisted, and one core strand material is fitted into a spiral void portion from which another core strand material is removed while being annularly formed. Is formed as an annular core,
A side wire strand material obtained by untwisting a side wire original cord in which at least six side wire strand materials are twisted together is wound around the annular core in a plurality of circles, and a spiral from which other side wire strand materials are removed. An annular metal cord, wherein the annular metal cord is spirally wound around a gap. The annular metal cord according to claim 1,
An annular metal cord, wherein both ends of the core strand material of the annular core are wound by being fitted into a spiral void portion from which another core strand material is removed. The annular metal cord according to claim 1 or 2,
Part of the core strand material of the annular core is a resin fiber. The annular metal cord according to claim 3,
An annular metal cord, wherein the resin fiber is an aramid fiber. The annular metal cord according to any one of claims 1 to 4,
The annular metal cord, wherein the strand material for the core of the annular core and the strand material for the side wire are twisted in the same direction.   An endless metal belt comprising the annular metal cord according to any one of claims 1 to 5. Untwisting a core core cord in which a plurality of core strand materials are twisted together, and inserting one core strand material into a spiral void portion from which another core strand material is removed while being circular. Formed as an annular core,
A side wire strand material obtained by untwisting a side wire original cord in which at least six side wire strand materials are twisted together is wound around the annular core in a plurality of circles, and a spiral shape from which other side wire strand materials are removed. A method for producing an annular metal cord, characterized by being wound spirally around a gap portion of the ring.

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