JP2011202321A - Ring-form metal cord, endless metal belt and method for producing ring-form metal cord - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ring-form metal cord which can maintain a wound shape without loosening a twisted state even when subjected to continuing repeated loads, to provide an endless metal belt, and to provide a method for producing the ring-form metal cord.SOLUTION: The ring-form metal cord C1 is produced by untwisting an original cord 20 prepared by twisting at least six strands 1, wherein one strand 1 is wound at least six turns in the form of a ring while inserting an excess part 1e into a spiral space 5 left after extracting other strands 1, the inner diameter Di of a hollow part C1a formed at the ring-form winding center of the strand 1 and the diameter Ds of the strand 1 satisfy the relationship of Di/Ds≥1.07, and both terminals 1a, 1b of the strand 1 are held in the hollow part C1a at a length longer than one turn length of the ring.

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.

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

  Accordingly, an object of the present invention is to provide an annular metal cord, an endless metal belt, and a method for manufacturing an annular metal cord that can maintain a wound shape without twisting and loosening even with continuous repeated loads. is there.

  An annular metal cord according to the present invention capable of solving the above-mentioned problems is obtained by untwisting an original cord in which at least six strand materials are twisted so as to surround a core material or a center without the core material. The strand material of the book is formed into an annular winding center of the strand material by being inserted into a spiral void portion from which the other strand material has been removed while being circularized at least six times. The inner diameter Di of the hollow portion and the diameter Ds of the strand material satisfy the relationship of Di / Ds ≧ 1.07, and both ends of the strand material are longer than the entire circumference of the annular portion. It is characterized by being housed in.

According to the annular metal cord having such a configuration, in the strand material taken out from the original cord in which at least six strand materials are twisted together, the spiral gap in which the other strand materials are removed while being circular in at least six rounds. When the extra length part is inserted into the part and wound, the contact resistance between adjacent strand materials is obtained, and the strand materials are constrained over the entire length of the strand material. Hateful. Moreover, since the winding state is maintained by the contact resistance between the strand materials, the terminal treatment can be made relatively simple.
Moreover, since the original cord in which at least six strand materials are twisted around the core material or surrounding the center without the core material is untwisted to form an annular shape at least six times, a hollow portion is formed at the center. Is done. By inserting both ends of the strand material into this hollow portion, contact resistance between the surface of both ends and the inner surface of the strand material spirally wound is added, and can be further firmly fixed. And since the length which accommodates a strand material in a hollow part is made longer than one cyclic | annular form, the part which a strand material overlaps in a hollow part is formed, and thereby contact resistance increases and a winding state is further maintained. It becomes easy to be done.
In addition, if the inner diameter Di of the hollow portion is too small with respect to the diameter Ds of the strand material, the strand material accommodated in the hollow portion from between the outer strand materials surrounding the hollow portion when repeatedly pulled and bent is obtained. In the present invention, the relationship of “Di / Ds ≧ 1.07” is defined so as to prevent the strand material from protruding outside. In order to improve the contact resistance between the strand materials, it is desirable to appropriately reduce the inner diameter Di of the hollow portion, so the upper limit value of Di / Ds is taken into consideration.

In the annular metal cord according to the present invention, it is preferable that both ends of the strand material are linearized and inserted into the hollow portion.
Thereby, both ends of the strand material can be accommodated and fixed in the hollow portion relatively easily.

In the annular metal cord according to the present invention, it is preferable that a portion where the both ends intersect with each other is wound into the hollow portion, and the both ends are accommodated in the hollow portion.
The strand material is formed into an annular shape at least 6 turns, and the ends of the strand material are crossed and wound together and pulled, so that the winding portion enters the hollow portion between the strand materials, and the portion where the both ends of the strand material are wound is a ring metal. It does not remain convex on the outer periphery of the cord. In addition, when the number of windings of both ends is 2 times or more, the wound portion enters the hollow portion at a steep angle, and the contact resistance with the strand material spirally wound around can be increased. It is possible to strongly restrain each other.

In the annular metal cord according to the present invention, the strand material has a structure in which a plurality of metal strands are twisted together, and the twist direction of the metal strands and the winding direction in which the both ends intersect are the same direction. Preferably there is.
The twist direction of the metal strands in the strand material and the winding direction in which both ends of the strand material intersect are made the same direction, so that the twist of the metal strands is prevented from returning at the intersection, and both ends are wound. The state can be stably maintained.

In the annular metal cord according to the present invention, it is preferable that two ends of the strand material are accommodated in the hollow portion over the entire circumference of the annular shape.
Thereby, since two strand materials are accommodated in the hollow portion, the contact resistance between the strand materials can be further increased, and the strand material can be prevented from coming off from the hollow portion.

Furthermore, it is preferable that the both ends of the said strand material are spirally wound around the said 1st circular part of the said cyclic | annular 2nd part in the said hollow part.
Since the strand materials are wound spirally in the hollow portion, the contact resistance can be further increased, and the first and second laps are integrated, and the strand material is more reliably removed from the hollow portion. Can be prevented.

In the annular metal cord according to the present invention, the strand material has a structure in which a plurality of metal strands are twisted together, and a strand material wound around the twist direction of the metal strands and the gap portion is wound. The spiral direction is preferably the reverse direction.
By reversing the twisting direction of the strands of metal in the strand material and the winding direction of the strand material, it is possible to suppress the occurrence of directivity in the mechanical properties of the annular metal cord, and the annular metal cord along the annular direction. Even when rotated and used, it becomes difficult to meander.

In the annular metal cord according to the present invention, it is preferable that a diameter of the metal strand is 0.03 mm or more and 0.30 mm or less.
Thereby, moderate rigidity can be given to a strand material and a strand material can have favorable fatigue resistance. As a result, the annular metal cord can be made more durable.

In the annular metal cord according to the present invention, it is preferable that a winding angle of the strand material with respect to a central axis in an annular portion of the strand material wound around each other is in a range of 4.5 degrees or more and 17.0 degrees or less.
Thereby, since the winding operation of the strand material becomes easy, the annular metal cord can be manufactured more easily. Moreover, the cyclic | annular metal cord which has moderate elongation and there is no winding looseness of a strand material can be obtained.

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.

  Moreover, the manufacturing method of the cyclic | annular metal cord which concerns on this invention which can solve the said subject WHEREIN: The original cord by which at least 6 strand material was twisted around the core material or surrounding the center without a core material was used. Untwisted, one strand material is formed into a circular shape by being fitted into a spiral void portion from which other strand materials have been removed while being made into an annular shape at least 6 turns, and formed into an annular winding center of the strand material. The inner diameter Di of the hollow portion and the diameter Ds of the strand material satisfy the relationship of Di / Ds ≧ 1.07, and both ends of the strand material are combined to be longer than the annular one round. It is housed in a part.

According to the manufacturing method of the annular metal cord having such a configuration, in the strand material taken out from the original cord in which at least 6 strand materials are twisted together, the spiral in which the other strand materials are removed while being annular in at least 6 turns. When the extra length is inserted into the gap and wound, the contact resistance between adjacent strand materials is obtained, and the strand materials are constrained over the entire length of the strand material. Looseness is unlikely to occur. Moreover, since the winding state is maintained by the contact resistance between the strand materials, the terminal treatment can be made relatively simple.
Moreover, since the original cord in which at least six strand materials are twisted around the core material or surrounding the center without the core material is untwisted to form an annular shape at least six times, a hollow portion is formed at the center. Is done. By inserting both ends of the strand material into this hollow portion, contact resistance between the surface of both ends and the inner surface of the strand material spirally wound is added, and can be further firmly fixed. And since the length which accommodates a strand material in a hollow part is made longer than one cyclic | annular form, the part which a strand material overlaps in a hollow part is formed, and thereby contact resistance increases and a winding state is further maintained. It becomes easy to be done.
In addition, if the inner diameter Di of the hollow portion is too small with respect to the diameter Ds of the strand material, the strand material accommodated in the hollow portion from between the outer strand materials surrounding the hollow portion when repeatedly pulled and bent is obtained. In the present invention, the relationship of “Di / Ds ≧ 1.07” is defined so as to prevent the strand material from protruding outside. In order to improve the contact resistance between the strand materials, it is desirable to appropriately reduce the inner diameter Di of the hollow portion, so the upper limit value of Di / Ds is taken into consideration.

In the manufacturing method of the annular metal cord according to the present invention, it is preferable that both ends of the strand material are straightened and inserted into the hollow portion.
Thereby, both ends of the strand material can be accommodated and fixed in the hollow portion relatively easily.

In the method for manufacturing an annular metal cord according to the present invention, it is preferable that the two ends are crossed and wound together, the portion is put in the hollow portion, and the both ends are accommodated in the hollow portion.
The strand material is formed into an annular shape at least 6 turns, and the ends of the strand material are crossed and wound together and pulled, so that the winding portion enters the hollow portion between the strand materials, and the portion where the both ends of the strand material are wound is a ring metal. It does not remain convex on the outer periphery of the cord. In addition, when the number of windings of both ends is 2 times or more, the wound portion enters the hollow portion at a steep angle, and the contact resistance with the strand material spirally wound around can be increased. It is possible to strongly restrain each other.

In the method for manufacturing an annular metal cord according to the present invention, the strand material has a structure in which a plurality of metal strands are twisted together, and a twist direction of the metal strands and a winding direction in which the both ends are intersected with each other. The same direction is preferable.
The twist direction of the metal strands in the strand material and the winding direction in which both ends of the strand material intersect are made the same direction, so that the twist of the metal strands is prevented from returning at the intersection, and both ends are wound. The state can be stably maintained.

In the method for manufacturing an annular metal cord according to the present invention, it is preferable that two ends of the strand material are accommodated in the hollow portion over the entire circumference of the annular shape.
Thereby, since two strand materials are accommodated in the hollow portion, the contact resistance between the strand materials can be further increased, and the strand material can be prevented from coming off from the hollow portion.

Furthermore, it is preferable that the annular second circumferential portion of both ends of the strand material is spirally wound around the annular first circumferential portion and accommodated in the hollow portion.
By winding the strand materials spirally in the hollow portion, the contact resistance can be further increased, and the first and second rounds can be integrated to more reliably prevent the strand material from coming out of the hollow portion.

In the method for producing an annular metal cord according to the present invention, the strand material has a structure in which a plurality of metal strands are twisted together, and the strand material is wound around and twisted in the gap portion. It is preferable that the spiral direction is the opposite direction.
By reversing the twisting direction of the strands of metal in the strand material and the winding direction of the strand material, it is possible to suppress the occurrence of directivity in the mechanical properties of the annular metal cord, and the annular metal cord along the annular direction. Even when rotated and used, it becomes difficult to meander.

In the manufacturing method of the annular metal cord according to the present invention, one of the remaining strand materials in the original cord is inserted into a spiral void portion from which the other strand material has been removed while being annularly looped at least six times. The inner diameter Di of the hollow portion formed at the annular winding center of the strand material and the diameter Ds of the strand material satisfy the relationship of Di / Ds ≧ 1.07, and both ends of the strand material are In addition, it is preferable that the hollow portion is accommodated longer than the entire circumference of the ring.
An annular metal cord can be further produced by the remaining strand material of the original cord, which is economical.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the cyclic | annular metal cord, endless metal belt, and cyclic | annular metal cord which can maintain the shape wound without the twist loosening generate | occur | producing with respect to continuous repeated load can be provided. Therefore, if the annular metal cord and the endless metal belt of the present invention are used in an industrial machine, the industrial machine can be made excellent in durability.

It is a perspective view of the annular metal cord concerning this embodiment. It is a cross-sectional perspective view of the radial direction which shows a cyclic | annular metal cord. (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 an expansion perspective view which sees and shows a part of cyclic | annular metal cord. It is a cross-sectional perspective view of the radial direction which shows the metal cord used for manufacture of a cyclic | annular metal cord. It is sectional drawing of the radial direction which shows an example of the metal cord used for manufacture of a cyclic | annular metal cord. It is a perspective view which shows the strand material taken out from the metal cord of FIG. It is the schematic which shows one process which forms a cyclic | annular metal cord from the strand material of FIG. It is an expansion perspective view which shows the method of winding the starting end part and the terminal part of a strand material. It is an expansion perspective view which shows the method of winding the starting end part and the terminal part of a strand material. It is a front view of the cyclic | annular metal cord which shows the method of accommodating the start end part and termination | terminus part of a strand material in a hollow part. It is a front view of the cyclic | annular metal cord which shows the method of accommodating the start end part and termination | terminus part of a strand material in a hollow part. 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. 2 is a radial sectional perspective view showing the annular metal cord, and FIG. 3A is a radial sectional view showing the annular metal cord C1. FIG. 4B is a side view of the annular metal cord C1, and FIG. 4 is an enlarged perspective view showing a part of the annular metal cord.
As shown in FIGS. 1 to 3, the annular metal cord C <b> 1 is formed by twisting a plurality of strand materials in a ring shape, and a strand material 1 in which a plurality of metal strands are twisted in advance as a strand material. Is used.

  The annular metal cord C1 of the present embodiment is prepared by preparing a single strand material 1 that is preliminarily spirally wound, and having a length of approximately 1/8 of the length excluding the terminal in an annular shape. The long portion is wound around the annular portion a plurality of times (five laps), and the extra length portions 1a and 1b at both ends are accommodated by one lap in the inner space of the strand material 1 wound six more times. Yes. The twist direction of winding is, for example, Z twist. When this annular metal cord C1 is viewed in a cross section in the radial direction of the strand material 1, it has a structure in which six strand materials 1 are arranged on the circumference and two strand materials 1a and 1b are accommodated inside thereof. ing.

In each strand material 1, three strands of metal 10 are twisted together in the S twist direction (under twisted) to form a strand material 10a, and this strand material 10a is twisted together in the S twist direction (medium twist). Has been configured).
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.
The strand material 1 is formed with a metal wire 10 having a diameter of 0.03 mm or more and 0.30 mm or less, and the diameter molding rate of the strand material 1 is adjusted to a degree suitable for the diameter of the metal wire 10, so that it is flexible and appropriate. A strand material 1 having a spiral shape can be obtained. Therefore, winding of the strand material 1 becomes easy, and winding looseness after winding becomes difficult to occur. It is preferable that the diameter shaping rate of the strand material 1 in the state made into the annular metal cord C1 is 101% or more.

  The diameter attaching ratio is the cross-sectional diameter of the annular metal cord C1 (the diameter of the cross-section in which one strand material 1 is fitted into a plurality of circumferential gaps and the six strand materials 1 are arranged in a circumferential shape). Is D, and the wave height (including self-diameter) of the shaped strand material 1 is H, it is expressed by “Diameter Die Rate (%) = H / D × 100”.

  The 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 strand material 1. On the other hand, since the strand material 1 itself has a structure in which the strand material 10a obtained by S-twisting the metal wire 10 is further S-twisted, the annular metal cord C1 is a combination of the S / S twist structure and the Z-winding structure. If the twisting direction of the metal strand 10 and the winding direction of the strand material 1 are reversed, the mechanical properties of the annular metal cord C1 are restrained from generating directionality and are not easily twisted, and the surface appearance has less irregularities. A metal cord 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 strand material 1 is wound at a predetermined winding angle with respect to six twisted central axes disposed on the outer periphery of the annular metal cord C1. For this reason, the strand material 1 is wound without disturbance, and the annular metal cord C1 having a substantially uniform surface state can be obtained. In the present embodiment, as shown in FIG. 3B, the winding angle θ of the 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 degrees or less. It has become. When the winding angle θ is set to 4.5 degrees or more, the strand material 1 is hardly loosened. By setting the winding angle θ to 17.0 degrees or less, the elongation of the strand material 1 can be prevented from becoming excessively large. That is, by setting the winding angle θ of the 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.

  As shown in FIG. 4, the winding start end portion (terminal) 1a and the winding end portion (terminal) 1b of the strand material 1 are crossed at the same circumference portion on the outer peripheral side of the circular arc of the annular metal cord C1. After being tied so as to be wound together (winding location 1c), the winding locations 1c are formed at the center of the annular metal cord C1 from between the surrounding strand materials 1 on both sides by pulling both ends. It is dropped into the hollow portion C1a (see FIG. 3A) and fixed. The winding portion 1c enters the hollow portion C1a at a steep angle from between the strand material 1 that is being circulated, the contact resistance with the strand material 1 that is spirally wound around the periphery is increased, and the winding portion 1c is strongly retained, and is not pulled out. It is definitely prevented.

  The twist direction of the metal strands 10 in the strand material 1 and the winding direction of the winding portion 1c where the start end portion 1a and the end portion 1b intersect are set in the same direction. In the present embodiment, the winding direction of the winding location 1c is the S direction. Thereby, it can prevent that the twist of metal strands 10 returns in the winding location 1c, and can maintain the winding state of the winding location 1c stably.

  In the winding start end portion 1a and terminal end portion 1b, the extra length portion on the terminal side from the winding location 1c is inserted into the annular hollow portion C1a from between the strand materials 1 spirally wound around each other. Has been. And the length which accommodates the start part 1a and the termination | terminus part 1b in the hollow part C1a is made longer than one cyclic | annular circumference of the cyclic | annular metal cord C1. When the length for accommodating the start end 1a and the end end 1b is longer than one round, a portion where the start end 1a and the end end 1b overlap in the hollow portion C1a is formed, thereby increasing contact resistance and further winding state Is easily maintained.

  Further, the start end portion 1a and the end end portion 1b are straightened and extended, and then inserted into the hollow portion C1a. Thereby, the start part 1a and the termination | terminus part 1b can be accommodated in the hollow part C1a comparatively easily, and can be fixed.

  In addition, since the location where two strand materials 1 enter in hollow part C1a seeing in a cross section is formed, if inner diameter Di of hollow part C1a was too small with respect to diameter Ds of strand material 1, it was repeatedly pulled and bent. In this case, there is a possibility that the start end 1a and the end end 1b accommodated in the hollow portion C1a may protrude from between the six outer strand materials 1 surrounding the hollow portion C1a. For this reason, the relationship of “Di / Ds ≧ 1.07” is defined so as to prevent the start end portion 1a and the end portion 1b from protruding outward. In addition, in order to improve the contact resistance of the start part 1a and the termination | terminus part 1b with respect to the strand material 1, it is desirable to make the internal diameter Di of hollow part C1a moderately small. For example, “1.55 ≧ Di / Ds” may be satisfied.

  Moreover, the cyclic | annular metal cord C1 of this embodiment is accommodated in the hollow part C1a covering the cyclic | annular 2 rounds or more of the start end part 1a and the termination | terminus part 1b of the strand material 1 collectively. That is, since two strand materials 1 are accommodated over the entire hollow portion C1a (one start portion 1a and one end portion 1b), the contact resistance between the strand materials 1 can be further increased. It is possible to prevent the starting end portion 1a and the terminal end portion 1b from coming off from the hollow portion C1a.

  Furthermore, as for the start end part 1a and the terminal part 1b of the strand material 1, in the hollow part C1a, the part after the 2nd ring is spirally wound around the part of the 1st ring. That is, as shown in FIG. 4, since the start end 1a and the end portion 1b are spirally wound in the hollow portion C1a, the contact resistance can be further increased, and the start end 1a and the end portion 1b can be more easily removed from the hollow portion C1a. It can be surely prevented.

  The spiral direction of winding of the start end part 1a and the terminal end part 1b in the hollow part C1a is a direction along the winding direction of the strand materials 1 located on the outer periphery of the hollow part C1a. That is, the twist direction of the metal strands of the strand material 1 and the winding direction of the start end portion 1a and the end portion 1b in the hollow portion C1a are reversed. This suppresses the occurrence of directionality in the mechanical properties of the annular metal cord, and makes it difficult to meander even when the annular metal cord is rotated along the annular direction.

For example, the annular metal cord C1 may be annealed at about 280 ° C. for 10 minutes in a reduced pressure environment.
Further, an adhesive resin may be applied to the boundary where the strand materials 1 are in contact with each other over the entire annular direction of the annular metal cord C1. Thereby, since strand material 1 can be hold | maintained so that it may not move not only by the 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.
FIG. 5 is a radial cross-sectional perspective view showing a metal cord prepared for manufacturing the annular metal cord C1.
As shown in FIG. 5, the metal cord (original cord) 20 is composed of six strand materials (sides) obtained by twisting (under twisting) the strand material 10 a made of the S-twisted metal strand 10 with S twist. The strand material 1 has a twisted wire structure in which the core material 1 is twisted so as to surround the center without the core (twisted). The upper twist direction is Z twist. Six strand materials (side strand materials) 1 may be twisted around the core material.

  The strand material 1 as a side line of the metal cord 20 is used to configure the annular metal cord C1. When these six strand materials 1 are twisted together to form the metal cord 20, each of the six strand materials 1 is spirally shaped at a diameter shaping rate corresponding to the diameter of the metal strand 10 constituting the strand material 1.

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, since the rigidity of the strand material 1 becomes low, the diameter molding rate of the strand material 1 can be increased, but on the other hand, when tension is applied during twisting, the molding is easily restored. 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 increases. The straightness of the shaped strand material 1 cannot be maintained. Even when the annular metal cord C1 is produced using such a strand material 1, the stranding of the strand materials 1 is not stable, which is not preferable. When the diameter of the metal strand 10 is 0.14 mm or less, the core as shown in FIG. 6 is used to increase the absolute value of the spiral corrugation height of the strand material 1 when the metal cord 20 is manufactured. The diameter D2 of the strand (core material) is increased from the diameter D3 of the strand material 1, and the number of the strand material (side strand material) 1 is increased by at least one from that when the ring metal is coded (in FIG. 6). By increasing the diameter molding rate of the strand material 1 to 91% or less, straightness can be easily maintained and molding is difficult to return. Further, by setting the diameter shaping rate to 70% or more, when one of the strand materials 1 is formed into an annular shape and the extra length portion is fitted into the spiral void portion a predetermined number of times, the spiral is of a degree that does not become difficult to fit. The shape is secured.
Therefore, when the diameter of the metal strand 10 is 0.03 mm or more and 0.14 mm or less, the core material to be used is increased in diameter and the number of the strand materials 1 is increased in the production of the metal cord 20. In addition, it is preferable to set the diameter forming rate of the strand material 1 to be applied to about 80%. Thus, when the strand material 1 is taken out by untwisting the metal cord 20 of FIG. 6, the spiral wave height (including the self-diameter) of the strand material 1 exceeds the cross-sectional diameter of the annular metal cord C1.

  When the diameter of the metal strand 10 is 0.15 mm or more, the rigidity of the strand material 1 can be maintained satisfactorily, 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 does not need to become excessively large. Therefore, the annular metal cord C1 can make it difficult for fatigue fracture due to repeated bending stress.

  When the metal strand 10 has a diameter of 0.15 mm or more and 0.30 mm or less, since the metal cord 20 is relatively easy to mold, the diameter of the strand material 1 is likely to be over 100%, and the ring shape is circular. It is easy to obtain the condition of “Di / Ds ≧ 1.07” when metal coding is performed.

  The number of strand materials 1 in the metal cord 20 determines the twisted structure of the strand material 1 including the diameter of the metal strand and the number of strand materials 1 necessary for the annular metal cord C1 according to the use of the annular metal cord C1. And it is determined from the diameter shaping rate of the 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 core material to be used, the number of the strand materials 1 on the side wires of the metal cord 20 is necessary for the annular metal cord C1. More than the number of turns of the strand material 1. When the metal wire diameter is relatively large and the diameter forming rate can be increased, the number of strand materials 1 on the side wire of the metal cord 20 is equal to the number of turns of the strand material 1 necessary for the annular metal cord C1, or Use less than the number of laps. It is preferable to adjust the diameter shaping rate of the strand material 1 in the state of the annular metal cord C1 to be 101% or more.

Such a metal cord 20 is untwisted and divided into each strand material 1, and one annular metal cord C <b> 1 is manufactured using one of these strand materials 1.
The core material of the metal cord 20 is not used for manufacturing the annular metal cord C1. Therefore, one monofilament of mild steel material having the same diameter may be used as the core material instead of the core strand 2.

  And as shown in FIG. 7, as for one strand material 1 taken out from the metal cord 20 as mentioned above, the helical space | gap part 5 is formed in the location where the other strand material 1 existed. . The gap portion 5 has a total cross-sectional area of the cross-sectional area of the hollow portion at the center of the metal cord 20 (the portion of the core material when the core material is provided) and the other five strand materials 1.

  Next, as shown in FIG. 8, the length of the strand material 1 is made to be approximately 1/8 of the length, and the extra length portion 1e of the strand material 1 is placed in the spiral gap 5 in the annular portion 1d. Fit and wrap around multiple rounds (5 rounds). The gap 5 in the strand material 1 has a cross-sectional area that is the sum of the cross-sectional areas of the hollow portion (the core material portion if the core material is provided) and the five strand materials 1 in the center of the metal cord 20. The extra length 1e of the strand material 1 wound in an annular shape is fitted into the gap 5, and the adjacent extra length portions 1e of the wound strand material 1 are in close contact with each other in the radial direction. Thereby, since strand material 1 is restrained over the full length of the strand material 1, even if a repeated load is added, twist loosening does not arise easily. Moreover, since the winding state is maintained by the contact resistance between the strand materials 1, it is possible to simplify the terminal processing of the start end portion 1 a and the end end portion 1 b of the strand material 1. As described above, according to this embodiment, the strand metal 1 is not loosened even under continuous repeated loads, and the annular metal cord C1 that can maintain the shape around which the strand material 1 is wound is easily manufactured. can do.

  Further, the diameter molding rate of the strand material 1 is adjusted according to the diameter of the metal wire 10, and the diameter Ds of the strand material 1 and the inner diameter of the hollow portion C1a in a state where the strand material 1 is wound in a six-round annular shape. The relationship with Di is set so that “Di / Ds ≧ 1.07”. Thereby, even if the starting end 1a and the terminal end 1b are combined and accommodated in the hollow part C1a longer than one annular round in the subsequent process, the starting end 1a and the terminal end 1b do not protrude.

  In addition, since the strand material 1 is not a single wire but a wire material obtained by twisting a plurality of metal strands 10, the contact resistance between the strand materials 1 is increased due to the unevenness of the surface of the strand material 1, so that twist looseness further occurs. It becomes difficult. 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.

  The strand material 1 is spirally shaped in the Z twist direction in the state of the metal cord 20. Therefore, the 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 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 are opposite, the occurrence of directivity is suppressed in the mechanical properties of the annular metal cord C1, and it is difficult to twist. A metal cord 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.

  After winding in an annular shape, the starting end 1a and the terminating end 1b of the strand material 1 are pulled out to the outer peripheral side of the annular arc on the same turn as shown in FIG. The lengths of the starting end portion 1a and the terminating end portion 1b are made to be longer than the entire length of the annular metal cord C1. And the start end part 1a and the termination | terminus part 1b are straightened and extended, and the edge part of these start end parts 1a and the termination | terminus part 1b is electrofused. If it does in this way, it can prevent that the metal strand 10 spreads in the terminal of these start end parts 1a and termination parts 1b.

  Then, as shown in FIG. 10, the starting end 1a and the terminating end 1b are crossed and wound around each other. The winding direction is preferably the same direction as the twist direction of the metal wires 10 in the strand material 1. In the present embodiment, the winding direction is the S direction. Thereby, it can prevent that the twist of metal strands 10 returns in the wound location, and can maintain the winding state of the wound location stably.

  After the start end portion 1a and the end portion 1b are crossed and wound around each other, the extra lengths of the start end portion 1a and the end portion 1b are pulled. If it does in this way, the force which linearizes the wound location will act, and as shown in Drawing 4, that winding location 1c will enter hollow part C1a from between strand materials 1 mutually. Thereby, the winding location 1c is fixed by contact resistance with the surrounding strand material 1. FIG. Moreover, since a winding location enters hollow part C1a from between the strand materials 1, the location which wound the start end part 1a and the termination | terminus part 1b of the strand material 1 does not remain convexly on the outer periphery of the cyclic | annular metal cord C1. 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.

  The winding location 1c may be wound once, but if it is two or more times, the winding location 1c enters the hollow portion C1a at a steep angle from between the strand material 1 that is circulated, and spirals around it. The contact resistance with the strand material 1 wound around becomes large, and is strongly held, and the disconnection is surely prevented.

  After dropping the winding part 1c into the hollow part C1a, as shown in FIG. 11, while winding the extra length of both ends that are outside from between the strand materials 1 along the gap between the strand materials 1 It is pushed into the hollow part C1a while moving along the ring. At this time, the start end 1a and the end end 1b are stretched and substantially straightened, so that they can be easily inserted into the gap. Then, when the start end portion 1a and the end portion 1b are inserted into the gap between the strand materials 1 in this way, the start end portion 1a and the end portion 1b are formed in the hollow portion C1a formed at the center of the six strand materials 1. Inserted.

  Then, when both terminals 1a and 1b are pushed into the hollow portion C1a from the winding point 1c to the annular one round (for example, both the terminals 1a and 1b are each half a round), the state shown in FIG. 12 is obtained. In the state of FIG. 12, both ends 1a and 1b are accommodated in the hollow portion C1a for one turn in total, that is, one strand material 1 is provided in the hollow portion C1a over the entire circumference except for the winding portion 1c. Contained.

  Both the terminals 1a and 1b are accommodated in the hollow portion C1a longer than the annular portion from the winding portion 1c. That is, from the state of FIG. 12, the extra lengths of both ends 1a and 1b are pushed along the annular portion C1a while being wound along the gap between the strand materials 1 and moving along the annular shape. In the present embodiment, the gap between the strand materials 1 has a spiral shape in the Z direction, and both ends 1a and 1b are also pushed into the hollow portion C1a in a spiral shape in the Z direction. Therefore, at this time, both ends 1a and 1b pushed into the hollow portion C1a are hollowed while being spirally wound in the Z direction around the strand material 1 of both ends 1a and 1b already accommodated in the hollow portion C1a. Housed in C1a. In the present embodiment, both terminals 1a and 1b are accommodated in the hollow portion C1a for two rounds. As a result, the end portions of both terminals 1a and 1b reach the winding location 1c as shown in FIG. And the start end part 1a and the termination | terminus part 1b of the strand material 1 inserted in the hollow part C1a are hold | maintained with a large contact resistance between the surrounding strand materials 1, and the disconnection of both ends is prevented reliably.

  Thereafter, the annular metal cord C1 is annealed at, for example, about 280 ° C. for 10 minutes under a reduced pressure environment. If it does in this way, the distortion which generate | occur | produces at the time of twisting of the cyclic | annular metal cord C1 (lower twist, upper twist) can be removed, and the further improvement of fatigue resistance of the cyclic | annular metal cord C1 can be anticipated by this.

The annular metal cord C1 manufactured in this way has the inner surface of the strand material 1 spirally wound around the surfaces of both ends 1a and 1b by inserting both ends 1a and 1b of the strand material 1 into the hollow portion C1a. Contact resistance is added and can be firmly fixed. And since the length which accommodates the strand material 1 in the hollow part C1a is made longer than one cyclic | annular circumference, the part which the strand material 1 overlaps in the hollow part C1a is formed, and thereby contact resistance increases. Furthermore, the winding state is easily maintained.
Further, the diameter forming rate of the strand material 1 and the number of winding wraps are adjusted so that the relationship between the diameter Ds of the strand material 1 and the inner diameter Di of the hollow portion C1a is “Di / Ds ≧ 1.07”. Since it manufactures, even if it receives repeated bending bending, it is prevented that the start end part 1a and the termination | terminus part 1b which were accommodated in the hollow part C1a protrude from between the outer six strand materials 1 surrounding the hollow part C1a. It is.

  Moreover, in the said embodiment, although the cyclic | annular metal cord C1 was manufactured using one strand material 1 of the six strand materials 1 which comprise the metal cord 20, remaining 5 each strand material 1 Similarly, as described above, the extra length portion 1e is fitted into the gap portion 5 and wound around the gap portion 5 to form an annular shape as described above, and the relationship between the inner diameter Di of the hollow portion C1a and the diameter Ds of the strand material 1 "Di /Ds≧1.07 ”is satisfied, and both ends of the strand material 1 are combined and accommodated in the hollow portion C1a longer than one annular round to manufacture the annular metal cord C1. Thereby, economic efficiency can be improved.

  In addition, although the said embodiment illustrated and demonstrated the case where the number of the strand materials 1 in a cross section is six, the strand materials 1 in a cross section are not limited to six. The configuration of the 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. 13 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. 13, 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. In addition, since the single strand material 1 is formed into an annular shape, the extra length portion 1e is fitted into the gap portion 5 and wound, and the terminal is accommodated in the hollow portion C1a to form an annular shape. And winding around the pulleys 32 and 34 eliminates the rotation of the annular metal cord C1 itself. That is, since rotation does not occur, fatigue can be suppressed, and the strand material 1 accommodated in the hollow portion C1a does not come off, and the winding of the strand material 1 in the annular metal cord C1 is loosened. Durability is good.
In addition, when the annealing process is performed, the processing distortion at the time of twisting of the strand material 1 can be removed, and 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.
For a plurality of types of annular metal cords with different strand diameters and twisted structures, the ratio of the inner diameter Di of the hollow portion formed at the annular winding center of the strand material and the diameter Ds of the strand material is changed, It used for the endurance test. Thereby, even when subjected to repeated bending, the conditions under which the strand material accommodated in the hollow portion did not protrude from between the outer strand materials surrounding the hollow portion were examined.

(1-1) 6 × 4 × 3 × 0.150 annular metal cord (production of strand material)
A steel wire used for steel cords with a diameter of 0.90 mm is rolled up on 3 reels and drawn into 3 reels using a buncher type wire twisting machine and twisted at a 7.5 mm twist pitch. Twist together. A predetermined amount of this 3 × 0.150 wire is wound up on 4 reels, supplied again, and twisted by 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. Six reels on which a predetermined amount of the strand material is wound are prepared.
(Preparation of original code)
The above 6 strand materials are twisted by a predetermined amount by Z twisting at a twisting pitch of 13.0 mm using a tubular twisted wire machine capable of twisting 7 strands, and 6 × 4 × 3 × 0.150. Of the original code. In addition, seven types of original cords including Examples and Comparative Examples are prepared in advance within a range of a diameter molding rate of 93% to 117% using a preform apparatus.
(Untwisting the original cord)
After cutting the original twisted original cord with a length of about 26 times ((D1) π × (N + 2) + α) of the annular diameter (layer core diameter: D1) of the annular metal cord, including the extra length, The strands are untwisted and separated for each strand material. N is the number of windings of the side strand material when circular coding is performed.
(Circular metal coding)
Using one of the separated six side strand materials, for example, an annular diameter having a diameter of 200 mm is formed, and then the spiral gap is formed by moving the other five strand materials by moving around five times. The extra length part is fitted into the part to form an annular code.
Thereafter, the starting end portion and the extra length end portion of the strand material are recut by leaving only the necessary length (approximately one round of the annular circumference), and the starting end portion and the extra length end portion are overlapped with each other. It is straightened as much as possible, and at one of the ends where the ends intersect each other, either one is wound around the other twice and pulled, and the wound portion is inserted into the hollow portion from between the strand materials. After that, after inserting the start end portion and the surplus length end portion into the hollow portion approximately every half of the annular circumference and accommodating one turn along the hollow portion, the half of the annular circumference is continuously taken to the first circumference. On the other hand, it was inserted into the hollow portion while being wound 15 turns, and this was used as a terminal treatment.

The thus produced 6 × 4 × 3 × 0.150 annular metal cords are referred to as Examples 1 to 4 and Comparative Examples 1 to 3.
In Examples 1-4 and Comparative Examples 1-3, the twisted structure and size of the original cord, the diameter shaping rate of the used strand material with respect to the original cord diameter, and the hollow portion before the both ends are accommodated in the hollow portion after being formed into an annular metal cord The ratio of the inner diameter, the hollow portion inner diameter Di and the strand material diameter Ds is shown in the following table. The hollow portion inner diameter Di was calculated from the difference between the cord outer diameter and the strand material outer diameter measured in two directions with a universal projector.

(1-2) 6 × 7 × 7 × 0.080 annular metal cord (production of metal strand)
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. This is reheated, patented, pickled, washed with water and then brass plated (copper plated, zinc plated, then alloyed by heat diffusion) to give 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 obtain a metal strand (for side strand material). Further, a brass-plated steel wire having a diameter of 0.55 mm is drawn to a diameter of 0.145 mm by a wet wire drawing machine to obtain a metal strand (for core strand material).
(Production of side strand material)
Using a tubular twisted wire machine capable of seven strands (1 + 6 configuration), a metal strand having a diameter of 0.08 mm is twisted (child twisted) with S twist at a twist pitch of 3.0 mm. 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 capable of 7 strands (1 + 6 configuration), medium twist (parent twist) with S twist at a twist pitch of 9.0 mm . 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.
(Production of core strand material)
Since it is not used for an annular metal cord, a metal strand having a diameter of 0.145 mm is subjected to S twisting at a twisting pitch of 4.5 mm using a tubular twisting machine capable of twisting 7 wires (1 + 6 configuration). Twist (child twist). At this time, it adjusts so that it may become a diameter shaping | molding rate of about 90% in advance with a preform apparatus. 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-type twisted wire machine that can twist 7 strands (1 + 6 configuration), under-twist (parent twist) with S twist at a 14.0 mm twist pitch . At this time, it adjusts so that it may become a diameter shaping | molding rate of about 90% in advance with a preform apparatus. One reel is prepared by winding a predetermined amount of this strand material.
(Preparation of original code)
With a twisted pitch of 22.0 mm using a tubular twisted wire machine capable of nine strands (1 + 8 configuration) using one reel of the above core strand material (parent twist) and eight reels of the side strand material (parent twist). A predetermined amount is twisted by Z-twisting to obtain an 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.
(Untwisting the original cord)
After cutting the upper twisted metal cord with a length of about 26 times ((D1) π × (N + 2) + α) of the necessary annular metal cord diameter (layer core diameter: D1) including the extra length , Untwisting over the entire length and separating each strand material. N is the number of windings of the side strand material when circular coding is performed.
(Production of ring metal cord)
Using one of the eight side strand materials separated from the original cord, for example, forming an annular diameter of 200 mm in diameter, and then moving it around 5 turns to make the other seven side strand materials A surplus length portion is fitted into the spiral gap that has been removed to form an annular metal cord having six strand materials in cross section.
Thereafter, the starting end portion and the extra length end portion of the strand material are recut by leaving only the necessary length (approximately one round of the annular circumference), and the starting end portion and the extra length end portion are overlapped with each other. It is straightened as much as possible, and at one of the ends where the ends intersect each other, either one is wound around the other twice and pulled, and the wound portion is inserted into the hollow portion from between the strand materials. After that, after inserting the start end portion and the surplus length end portion into the hollow portion approximately every half of the annular circumference and accommodating one turn along the hollow portion, the half of the annular circumference is continuously taken to the first circumference. On the other hand, it was inserted into the hollow portion while being wound 15 turns, and this was used as a terminal treatment.

A 6 × 7 × 7 × 0.080 annular metal cord produced in this way is referred to as Example 6. Moreover, what produced the 6x7x7x0.080 cyclic | annular metal code | cord | chord by changing the structure of an original cord is set as Example 5 and Comparative Examples 4 and 5. FIG.
In Examples 5 and 6 and Comparative Examples 4 and 5, the twisted structure and size of the original cord, the diameter forming ratio of the used strand material with respect to the original cord diameter, the hollow portion before the both ends are accommodated in the hollow portion after being formed into the annular metal cord The ratio of the inner diameter, the hollow portion inner diameter Di and the strand material diameter Ds is shown in the following table.

(1-3) 6 × 7 × 7 × 0.060 annular metal cord (production of metal strand)
After a 3.8 mm diameter wire for steel cord is pickled, it is drawn to a diameter of 1.4 mm with a dry wire drawing machine, heated, patented, pickled, and then again dry drawn. The wire is drawn to a diameter of 0.40 mm using a machine. This is reheated, patented, pickled, washed with water and then brass plated (copper plated, zinc plated, then alloyed by heat diffusion) to give a brass plated steel wire with a diameter of 0.40 mm. This is drawn to a diameter of 0.06 mm by a wet wire drawing machine to obtain a metal strand (for side strand material). Further, the brass-plated steel wire having a diameter of 0.55 mm produced in the above (1-2) is drawn to a diameter of 0.13 mm by a wet wire drawing machine to obtain a metal strand (for core strand material).
(Production of side strand material)
A metal strand having a diameter of 0.06 mm is pre-twisted (child-twisted) with an S twist at a 2.5 mm twist pitch using a tubular twisted wire machine capable of seven strands (1 + 6 configuration). At this time, it adjusts so that it may become a diameter shaping | molding rate of about 80% by a preform apparatus beforehand. 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 7.0 mm (parent twist). . At this time, it adjusts so that it may become a diameter shaping | molding rate of about 80% by a preform apparatus beforehand. Nine reels prepared by winding a predetermined amount of this strand material are prepared.
(Production of core strand material)
Since it is not used for an annular metal cord, a metal strand having a diameter of 0.13 mm is subjected to S twisting at a 5.0 mm twist pitch using a tubular twisting machine capable of twisting seven wires (1 + 6 configuration). Twist (child twist). At this time, it adjusts so that it may become a diameter shaping | molding rate of about 90% in advance with a preform apparatus. 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), it is twisted in the S twist at a 11.5 mm twist pitch (parent twist). . At this time, it adjusts so that it may become a diameter shaping | molding rate of about 90% in advance with a preform apparatus. One reel is prepared by winding a predetermined amount of this strand material.
(Preparation of original code)
Using a tubular twisted wire machine capable of 10 strands (1 + 9 configuration) using 1 reel of the above-described core strand material (parent twist) and 9 reels of side strand material (parent twist) at a twist pitch of 20.0 mm A predetermined amount is twisted by Z twisting to obtain an original cord of 1 × 7 × 7 × 0.13 + 9 × 7 × 7 × 0.06. In addition, it adjusts to the diameter shaping | molding rate of about 80% in advance using a preform apparatus.
(Untwisting the original cord)
After cutting the upper twisted metal cord with a length of about 26 times ((D1) π × (N + 2) + α) of the necessary annular metal cord diameter (layer core diameter: D1) including the extra length , Untwisting over the entire length and separating each strand material. N is the number of windings of the side strand material when circular coding is performed.
(Production of ring metal cord)
Using one of the nine side strand materials separated from the original cord, for example, forming an annular diameter of 200 mm in diameter, and then moving it around 5 turns to make the other eight side strand materials A surplus length portion is fitted into the spiral gap that has been removed to form an annular metal cord having six strand materials in cross section.
Thereafter, the starting end portion and the extra length end portion of the strand material are recut by leaving only the necessary length (approximately one round of the annular circumference), and the starting end portion and the extra length end portion are overlapped with each other. It is straightened as much as possible, and at one of the ends where the ends intersect each other, either one is wound around the other twice and pulled, and the wound portion is inserted into the hollow portion from between the strand materials. After that, after inserting the start end portion and the surplus length end portion into the hollow portion approximately every half of the annular circumference and accommodating one turn along the hollow portion, the half of the annular circumference is continuously taken to the first circumference. On the other hand, it was inserted into the hollow portion while being wound 15 turns, and this was used as a terminal treatment.

A 6 × 7 × 7 × 0.060 annular metal cord produced in this way is referred to as Example 8. Moreover, what produced the 6x7x7x0.060 cyclic | annular metal cord by changing the structure of an original cord is set as Example 7 and Comparative Examples 6-8.
In Examples 7 and 8 and Comparative Examples 6 to 8, the twisted structure and size of the original cord, the diameter shaping rate of the used strand material with respect to the original cord diameter, and the hollow portion before the both ends are accommodated in the hollow portion after being formed into the annular metal cord The ratio of the inner diameter, the hollow portion inner diameter Di and the strand material diameter Ds is shown in the following table.

(2) Durability Test (2-1) Durability Test Device FIG. 14 shows a durability test device. As shown in FIG. 14, 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 cord (1-1) were 38.8 mm (40.0 mm in diameter at the center of the suspended annular metal cord). The diameters of the driving pulley 52 and the driven pulley 53 when testing the annular metal cord (1-2) were 23.9 mm (diameter 25.0 mm at the center of the suspended annular metal cord). The diameters of the driving pulley 52 and the driven pulley 53 when testing the annular metal cord (1-3) were 19.2 mm (diameter 20.0 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, and the additional tension is 17.5 kg (around 5% of the cord strength) in the above-described (1-1) annular metal cord. The ring metal cord of -2) was 19.5 kg (around 5% of the cord strength), and the ring metal cord of (1-3) was 11.5 kg (around 5% of the cord strength). In Examples 3, 4, 6, and 8 where the winding of the strand material was 7 turns in total, the weight 56 was 7/6 times the weight of the 6 turns example.

(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. Moreover, it was investigated whether the terminal of the strand material accommodated in the hollow part jumped out outside.

(3-3) Durability Test Results Durability test results for the annular metal cord of (1-1) are shown in the following table.

As shown in Table 4, in Examples 1 to 4, the number of repeated tensile bending that can be endured was extremely large, and the start and end portions of the strand material did not jump out.
On the other hand, in Comparative Examples 1 to 3, the number of repeatable bending bending that can be tolerated was small, and the start and end portions of the strand material jumped out.

  Subsequently, the endurance test result in the annular metal cord of (1-2) is shown in the following table.

As shown in Table 5, in Examples 5 and 6, the number of repeated tensile bending that can be tolerated was extremely large, and the start and end portions of the strand material did not jump out.
On the other hand, in Comparative Examples 4 and 5, the number of repeatable bending bendings that can be tolerated was small, and the start and end portions of the strand material jumped out.

  Next, the endurance test results for the annular metal cord (1-3) are shown in the following table.

As shown in Table 6, in Examples 7 and 8, the number of repeated tensile bending that can be endured was extremely large, and there was no protrusion of the start and end portions of the strand material.
On the other hand, in Comparative Examples 7 and 8, the number of repeated tensile bending that can be tolerated was small, and the start and end portions of the strand material jumped out.
In Comparative Example 6, the hollow portion inner diameter was too small, and it was difficult to put both ends of the strand material, and it was not possible to obtain a satisfactory annular metal cord shape, so the durability test was not performed. .

  From the above, the original cord in which at least 6 strand materials are twisted together is untwisted, and one strand material is fitted into a spiral void portion from which other strand materials have been removed while making at least 6 rounds of annulus. When both ends of the strand material are combined and accommodated in the hollow portion longer than one round of the annular shape to form an annular metal cord, the inner diameter of the hollow portion formed at the annular winding center of the strand material When Di and the diameter Ds of the strand material satisfy the relationship of Di / Ds ≧ 1.07, it is possible to prevent the jumping of both ends of the strand material having good durability and accommodated in the hollow portion. It turned out that it can be set as a strong cyclic | annular metal cord.

  DESCRIPTION OF SYMBOLS 1 ... Strand material, 1a ... Start end part (terminal), 1b ... Terminal part (terminal), 1e ... Extra length part, 5 ... Space | gap part, 10 ... Metal wire, 20 ... Metal cord (original cord), B1 ... Endless Metal belt, C1, C2 ... annular metal cord, C1a ... hollow part

Claims (18)

  An original cord in which at least six strand materials are twisted so as to surround a core material or a center without the core material is untwisted, and one strand material is formed into an annular shape at least six times while other strands are formed. An inner diameter Di of the hollow portion formed at the annular winding center of the strand material and a diameter Ds of the strand material is Di. /Ds≧1.07 is satisfied, and both ends of the strand material are accommodated in the hollow portion longer than the entire circumference of the ring. The annular metal cord according to claim 1,
An annular metal cord, wherein both ends of the strand material are straightened and inserted into the hollow portion. The annular metal cord according to claim 1 or 2,
An annular metal cord characterized in that a portion where the two ends intersect and are wound around each other is placed in the hollow portion, and the both ends are accommodated in the hollow portion. The annular metal cord according to claim 3,
The strand material has a structure in which a plurality of metal strands are twisted together, and the twist direction of the metal strands and the winding direction in which the both ends intersect are the same direction. . The annular metal cord according to any one of claims 1 to 4,
An annular metal cord characterized in that two ends of the strand material are accommodated in the hollow portion over the entire circumference of the annular shape. The annular metal cord according to claim 5,
Both ends of the strand material are annular metal cords characterized in that the annular second circumferential portion is spirally wound around the annular first circumferential portion in the hollow portion. The annular metal cord according to any one of claims 1 to 6,
The strand material has a structure in which a plurality of metal strands are twisted together, and the twist direction of the metal strands is opposite to the spiral direction of winding of the strand material fitted in the gap. An annular metal cord characterized by The annular metal cord according to claim 4 or 7,
An annular metal cord having a diameter of the metal strand of 0.03 mm to 0.30 mm. The annular metal cord according to any one of claims 1 to 8,
An annular metal cord, wherein a winding angle of the strand material with respect to a central axis in an annular portion of the strand material wound around each other is within a range of 4.5 degrees or more and 17.0 degrees or less.   An endless metal belt comprising the annular metal cord according to any one of claims 1 to 9.   Another strand material is formed by untwisting an original cord in which at least 6 strand materials are twisted so as to surround a core material or a center without the core material, and to form one strand material in an annular shape at least 6 times. The inner diameter Di of the hollow portion formed at the annular winding center of the strand material and the diameter Ds of the strand material are Di / Ds ≧ 1. 0.07 is satisfied, and both ends of the strand material are combined and accommodated in the hollow portion longer than one round of the annular shape. It is a manufacturing method of the annular metal cord according to claim 11,
A method for producing an annular metal cord, wherein both ends of the strand material are straightened and inserted into the hollow portion. It is a manufacturing method of the annular metal cord according to claim 11 or 12,
A method for producing an annular metal cord, characterized in that the two ends are crossed and wound together, the portion is put in the hollow portion, and the both ends are accommodated in the hollow portion. It is a manufacturing method of the annular metal cord according to claim 13,
The strand material has a structure in which a plurality of metal strands are twisted together, and a twisted direction of the metal strands and a direction in which the both ends are crossed and wound are in the same direction. Manufacturing method. It is a manufacturing method of the annular metal cord according to any one of claims 11 to 14,
A method for producing an annular metal cord, wherein two ends of the strand material are accommodated in the hollow portion over the entire circumference of the annular shape. It is a manufacturing method of the annular metal cord according to claim 15,
The annular metal cord is manufactured by spirally winding the annular second circumferential portion of both ends of the strand material around the annular first circumferential portion and accommodating the hollow metallic cord. Method. A method for producing an annular metal cord according to any one of claims 11 to 16,
The strand material has a structure in which a plurality of metal strands are twisted together, and the twist direction of the metal strands and the spiral direction of winding of the strand material to be fitted in the gap are opposite directions. A method of manufacturing a ring metal cord. A method for producing an annular metal cord according to any one of claims 11 to 17,
One of the remaining strand materials in the original cord is formed into an annular shape by being fitted into a spiral void portion from which other strand materials have been removed while being annularly formed at least six times, and formed into an annular winding center of the strand material. The inner diameter Di of the hollow portion and the diameter Ds of the strand material satisfy the relationship of Di / Ds ≧ 1.07, and the both ends of the strand material are combined longer than the entire circumference of the ring. A method for producing an annular metal cord, wherein the annular metal cord is accommodated in a hollow portion.

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