JPH05230782A - Rope for operation - Google Patents

Abstract

PURPOSE:To provide a rope producible at a remarkably reduced production cost without lowering corrosion resistance and durability. CONSTITUTION:The objective rope 1 is produced by twisting strands 2, 3, 4 consisting of steel wires. A highly corrosion-resistant steel wire (e.g. a wire plated with zinc-aluminum alloy) is used at least as the strand exposed to the surface (e.g. strand 4 of the 2nd layer) and is not used at least as the core strands of the rope 1 (e.g. core strand 2 and the 1st layer strands 3).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rope for operation (hereinafter, simply referred to as rope). More specifically, the present invention relates to a rope excellent in corrosion resistance and bending durability, which is suitable for use in a control cable for a window regulator of an automobile and is widely applicable to various fields.

[0002]

2. Description of the Related Art A rope is generally formed by twisting a plurality of strands of wire, or by twisting a plurality of strands thus obtained. Such a rope may be corroded if, for example, salt water adheres to it.

Therefore, in order to prevent the occurrence of such corrosion in recent years, (a) after a galvanized layer is provided on a steel wire, the steel wire is drawn to form a wire, and the wire is twisted to form a wire rope. A wire rope having a tin-plated layer (Japanese Utility Model Publication No. 54-25500), and (b) a steel wire plated with nickel or a nickel alloy, and a zinc or zinc alloy-plated layer formed on the wire rope. Alternatively, a rope made by tin alloy plating, drawing and twisting the steel wire (Japanese Utility Model Publication No. 2-10332), (c) Steel wire is zinc-aluminum alloy plated, and then stretched. There has been proposed an inner cable for a control cable (Japanese Patent Laid-Open No. 2-212616), which is constructed by twisting and twisting the wires.

[0004]

The inner ropes for ropes and control cables are certainly improved in corrosion resistance as compared with the usual zinc plated ones. However, since the wire rope of (a) is plated at the stage of the busbar and requires a plating step again after the twisting work, the total number of man-hours is increased, which eventually leads to an increase in manufacturing cost.

With respect to the rope (b), three types of plating are carried out in individual steps, so that the number of man-hours required for the work is significantly increased.

Further, if the element wires are plated with zinc-aluminum alloy like the inner cable for control cable of (c), the manufacturing cost becomes high.

An object of the present invention is to provide a rope which has corrosion resistance equivalent to that of the conventional product, has excellent bending durability, and has reduced manufacturing cost.

[0008]

The rope for operation of the present invention is an operation rope constructed by twisting wires made of steel wires, and the wires exposed on at least the surface of the rope. A high-corrosion-resistant steel wire is arranged, and at least the rope center strand is not made of a high-corrosion resistant steel wire.

For example, when the operating rope is an operating rope having a single twist structure in which one or several layers of strands are twisted together, a highly corrosion resistant steel wire is arranged on the outermost strand of the rope. In the case where the operation rope is an operation rope having a multi-twisted structure formed by twisting a plurality of strands formed by twisting a plurality of strands, the rope side is the side of the rope. An example is one in which a highly corrosion-resistant steel wire is arranged on each element wire forming the strand.

As the operation rope of the double twist structure,
7 × 7 rope with a tightening ratio of 2.5-8%, or 19 + 8 × 7 structure or parallel twist + 8 × 7
A structure rope having a tightening rate of 4 to 11% and a shaping rate of 65 to 90% is used.

As a high corrosion resistant steel wire, zinc-aluminum alloy plating is applied to the wire exposed on the surface of the rope,
A galvanized wire may be used as the bare wire not exposed on the surface.

[0012]

OPERATION AND EXAMPLES The rope of the present invention has a high corrosion resistant steel wire, for example, a steel wire provided with a zinc-aluminum alloy plating layer, which is exposed on the surface thereof.
In the case of such a zinc-aluminum alloy plated layer, the corrosion resistance is superior to that of a conventional mere zinc plated layer. Therefore, it can sufficiently withstand long-term use.

However, compared with the conventional zinc plating, the cost of the high corrosion resistant plating such as the zinc-aluminum alloy plating is high. Therefore, if such a high corrosion-resistant plating is applied to all strands, the rope becomes an expensive rope. Further, it is not preferable to use a rope in which a steel wire, which has excellent corrosion resistance but inferior bending durability, for all strands is susceptible to bending.

Like the rope of the present invention, by forming the high corrosion resistant steel wire layer on the wire exposed on the surface,
As mentioned above, the corrosion resistance is not inferior to the rope in which all the wires are plated with high corrosion resistance, while the manufacturing cost is much lower.

Further, by using a steel wire having excellent corrosion resistance but poor flexing durability only in the surface layer, and using a steel wire having poor corrosion resistance but excellent flexing durability other than that, the corrosion resistance is improved. It is possible to make ropes that are excellent and have excellent bending durability.

The aluminum is a component that imparts excellent corrosion resistance to the plating film. In addition to the above aluminum, if necessary, for example, silicon, magnesium,
A trace amount of sodium, misch metal, etc. may be added.

If the content of the aluminum in the plated layer exceeds 10% by weight, the corrosion resistance decreases. On the contrary, if it is less than 1% by weight, the corrosion resistance is lowered. Therefore, the aluminum content is preferably 1 to 10% by weight, more preferably 4 to 5% by weight.

Since the composition of the plating layer generally appears as it is in the plating bath, it can be adjusted by adjusting the composition of the plating bath.

If the rope is stretched in order to maintain corrosion resistance, the coating weight is 15% in the rope state.
It is preferably g / m ² or more.

When the strands drawn from the busbars are twisted together to form a rope, the amount of plating deposited is 15g in the rope state.
/ M ² to secure 100 / g ² on the bus bar
400 g / m ² in order to maintain appropriate wire drawability
The following is preferable.

In the present invention, the method for providing a zinc-aluminum alloy plating layer, for example, on the wire of the rope is not particularly limited, but plating in which aluminum is dissolved and mixed in a plating bath used when performing ordinary hot dip galvanizing is applied. One method is to dip a steel wire in the bath and then draw it.

In this case, when the amount of aluminum is 5% by weight, it becomes a eutectic point, so that a uniform eutectic structure can be obtained.

The wires provided with the zinc-aluminum alloy plating layer as described above are twisted into a rope. Since the rope has excellent corrosion resistance, it can sufficiently withstand long-term use as described above.

Although the zinc-aluminum alloy plated wire has been described as an example of the high corrosion resistant steel wire in the present invention, the invention is not particularly limited to the zinc-aluminum alloy plated wire. Stainless steel wire or the like may be adopted.

Next, the rope of the present invention will be described with reference to the drawings.

1 to 6 are cross-sectional views showing an embodiment of the rope of the present invention.

As the rope used in the present invention, for example, one having a sectional shape as shown in FIGS. 1 to 6 is used, but the present invention is not limited to such a shape.

In FIGS. 1 to 6, the wires indicated by double circles are high corrosion resistant steel wires.

The rope 1 shown in FIG. 1 is an example of a single-twisted rope, which is a rope obtained by twisting one or several layers of strands. This rope 1 has 6 cores around one core wire 2.
It is a rope formed by twisting the first layer strands 3 of a book and further twisting 12 second layer strands 4 around it. The second layer strands 4 are made of high corrosion resistant steel wire. It is used.

The rope 5 in FIG. 2 comprises a first layer wire 6 and a second layer wire 6.
The rope is the same as that shown in FIG. 1 except that a high corrosion resistant steel wire is also used for the layer wire 7.

The rope 8 in FIG. 3 has a so-called 7 × 7 structure. That is, the core strand 9 is replaced with one core wire.
6 side strands 11 are twisted around the periphery of 10 to form side strands 12 and 6 side strands 14 around one core strand 13.
Is formed by twisting together, and the six side strands 12 are twisted around the core strand 9 to form a multi-twisted rope. The side strands 14 of the side strands 12 are made of high corrosion-resistant steel wire. ing.

The rope 15 in FIG. 4 is the core wire of the side strand 16.
A rope similar to that of FIG. 3 except that high corrosion-resistant steel wire is used for the side wires 17 and the side wires 18.

The rope 19 shown in FIG. 5 is so-called 19 + 8 × 7.
The structure is adopted.

That is, the core strand 20 is formed by twisting six first side wires 22 and twelve second side wires 23 around one core wire 21 and forming side strands 24. A multi-twist structure rope constructed by twisting six side strands 26 around one core strand 25 and twisting eight side strands 24 around the core strand 20. Therefore, a high corrosion resistant steel wire is used for the core wire 25 of the side strand 24 and the side wire 26 of the side strand 24.

The rope 27 of FIG. 6 has a 19 + 8 × 7 structure, but its core strand 28 is twisted in parallel twist (also referred to as wire contact twist). The parallel twist is a twist type in which strands having different outer diameters are combined so that the twist pitch and twist direction of each layer are the same. By twisting in this manner, the strands of the outer layer fit into the groove portions between the strands of the inner layer, so that the strands do not cross each other and substantially make line contact. As a result, the tightness of the strand is good, and the mold is less likely to lose its shape. Further, it exhibits excellent characteristics that the internal wear of the strand (due to the friction between the strands) is small and the fatigue due to the secondary bending does not occur.

The rope 27 in FIG. 6 is a core strand having a Warrington type twist structure of the parallel twist + 8 × 7 structure.
28 has a W (19) + 8 × 7 structure. The Warrington type has the smallest difference between the maximum strand diameter and the minimum strand diameter among the 19 parallel strands, and is suitable for thin strands.

Specifically, six first side wires 30 having a diameter slightly smaller than that of the core wire 29 are arranged around one core wire 29, and between the first side wires 30. Six third side strands 31 having the same diameter as the core strand 29 are arranged, and the first side strand 30 is provided with the first side strand 31 in the upper layer.
6 second side wires 32 having a smaller diameter than the side wires 30 are arranged,
The side strands 30, 31, 32 are simultaneously twisted in the same pitch and in the same direction to form the core strand 28. The diameter of each strand of the core strand is not limited to the above. In short, when the strands are twisted in the same direction at the same pitch, the strand diameter may be appropriately selected so that the strands come into line contact with each other.

The eight side strands 33 are composed of the core wire 34.
6 side strands 35 are twisted around each other, and both the core strand 34 and the side strands 35 are made of high corrosion-resistant steel wire.

Next, the rope of the present invention will be described in more detail based on specific examples. In addition, in Example 1 and Comparative Examples 1 to 3 described below, the rope having the double twist structure of the 7 × 7 structure was used.

Example 1 A zinc plating bath was used for the core strand wires.
Hold at 430 ~ 480 ℃, in which steel wire (material: JISG 350
6 SWRH 62 A) was dipped to obtain a bus bar with an outer diameter of 1.05 mm. The plating deposition amount on the bus bar was 150 g / m ² .

Further, a bus bar was manufactured in the same manner as the above-mentioned conditions for the core strand wire except that a plating bath consisting of 4% by weight of aluminum and the balance zinc was used for the side strand wire.

Next, these bus bars were drawn to respectively obtain core strands for core strands with an outer diameter of 0.185 mm, side strands for core strands with an outer diameter of 0.185 mm, and core strands for side strands with an outer diameter of 0.185 mm. Wire 13 and side strands for 0.175 mm outer diameter side strands
14 were manufactured. In addition, the coating weight of the wire after drawing is 30g
/ M ² . As shown in FIG. 3, they were twisted into a 7 × 7 structure to obtain a rope of Example 1 having an overall outer diameter of 1.5 mm.

Comparative Example 1 The above-mentioned Example 1 was used for both core strands and side strands.
In addition to using the zinc-aluminum plating bath in
A bus bar was manufactured in the same manner as in Example 1, and wire drawing and twisting were performed in the same manner as in Example 1 to manufacture a 7 × 7 structure rope as Comparative Example 1.

Comparative Example 2 A bus bar was produced in the same manner as in Example 1 except that ordinary galvanizing baths were used for both core strands and side strands, and wire drawing and twisting were performed in the same manner as in Example 1. Then, the same 7 × 7 structure rope was manufactured as Comparative Example 2.

The amount of plating adhered to the wires after wire drawing was 30 g / m ² .

Comparative Example 3 A wire rope described in Japanese Utility Model Publication No. 54-25500 having an outer diameter of 1.5 mm and a structure of 7 × 7 was purchased as Comparative Example 3. The total coating weight of the two layers of zinc and tin was 30 g / m ² .

The red rust generation time was confirmed by the salt spray test of JIS Z 2371 for the rope of Example 1 and the ropes of Comparative Examples 1 to 3 produced as described above.

The results are shown in Table 1.

[0049]

[Table 1]

As can be seen from Table 1, each strand of the core strand is galvanized and each strand of the side strand is zinc-plated.
The aluminum alloy-plated rope of Example 1 is different from the rope of Comparative Example 2 in which all strands are plated with zinc alone and the rope of Comparative Example 3 in which zinc + tin is plated in two layers. It can be seen that the corrosion resistance is improved.

On the other hand, when compared with the rope of Comparative Example 1 in which all the strands constituting the rope were plated with zinc-aluminum alloy, it was found that their corrosion resistance was equivalent.

As described above, by using the high corrosion resistant steel wire only for the bare wires exposed on the surface, the rope having the same corrosion resistance at a lower cost than the rope using the high corrosion resistant steel wire for all the bare wires You can get

When the rope has a double twist structure, for example, in the case of the 7 × 7 structure rope, the tightening rate is 2.5 to 8%.
If it is formed by twisting within the range, it will be twisted harder than the conventional rope of 7 × 7 structure (tightening ratio 0 to 2%), so that it can be bent while sliding, such as a guide part that does not rotate. However, secondary bending is less likely to occur and durability is not deteriorated, which is preferable.

In addition, the above 19 + 8 × 7 structure and parallel twist +8
For ropes with × 7 structure, if the tightening ratio is in the range of 4 to 11% and the shaping ratio is in the range of 65 to 90%, the conventional 19 + 8 ×
Rope with 7 structures (tightening rate 0 to 2% and shaping rate 95 to 100
%) Has the above advantages.

The tightening ratio is a value (percentage) obtained by dividing the value obtained by subtracting the actually measured outer diameter of the rope from the total sum of the outer diameters of the individual wires in the rope diameter direction (referred to as the calculated outer diameter). :
%).

The shaping ratio is the measured outer diameter of the rope,
A value (percentage:%) obtained by dividing the waviness diameter of the strand when the rope is unraveled.

[0057]

Since the rope of the present invention uses the high corrosion resistant steel wire for the wire exposed on the surface thereof, it has been conventionally used even when used in an environment where salt water adheres. It can withstand corrosion for a longer time than products. Moreover, since such a high corrosion resistance steel wire may be used only for the wire exposed on the surface of the rope, it can be manufactured at a lower cost than that used for the whole wire.

Further, even in the case of a steel wire having a high corrosion resistance and a poor bending durability, the rope having a high corrosion resistance and a high bending durability can be provided by arranging the high durability steel wire in the inner layer of the rope. Can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a rope of the present invention.

FIG. 2 is a cross-sectional view showing another embodiment of the rope of the present invention.

FIG. 3 is a cross-sectional view showing still another embodiment of the rope of the present invention.

FIG. 4 is a cross sectional view showing still another embodiment of the rope of the present invention.

FIG. 5 is a cross sectional view showing still another embodiment of the rope of the present invention.

FIG. 6 is a cross-sectional view showing still another embodiment of the rope of the present invention.

[Explanation of symbols]

 1 Rope 2 Core element wire 3 First layer element wire 4 Second layer element wire 5 Rope 6 First layer element wire 7 Second layer element wire 8 Rope 9 Core strand 10 Core strand Core element wire 11 Core strand side element wire 12 Side strand 13 Side strand Core element wire 14 Side strand Side element wire 15 Rope 16 Side strand 17 Side strand Core element wire 18 Side strand Side element wire 19 Rope 20 Core strand 21 Core strand Core element wire 22 Core strand First side element wire 23 core strand second side strand 24 side strand 25 side strand core strand 26 side strand side strand 27 rope 28 core strand 29 core strand core strand 30 core strand first side strand 31 core strand third side strand 32 core strand second side strand 33 side strand 34 side strand core strand 35 side strand side strand

Claims (8)

[Claims] 1. A rope for operation, which is formed by twisting strands made of steel wire, wherein a high corrosion-resistant steel wire is arranged on at least the strands exposed on the surface of the rope, and at least the rope. An operation rope characterized by not using high-corrosion resistant steel wire for the core wire. 2. The twisted structure is a single twist structure.
The operating rope described. 3. The operating rope according to claim 1, wherein the operating rope has a multi-twisted structure, and each of the strands constituting the side strand of the rope is provided with a highly corrosion resistant steel wire. 4. A rope of 7 × 7 structure, having a tightening rate
The operation rope according to claim 1, which is 2.5 to 8%. 5. A rope of 19 + 8 × 7 structure, having a tightening rate of 4 to 11% and a shaping rate of 65 to 90%.
The operating rope described. 6. The operating rope according to claim 1, wherein the core strands are twisted in parallel. 7. The operating rope according to claim 6, wherein the twist structure is a parallel twist + 8 × 7 structure, and the tightening rate is 4 to 11% and the shaping rate is 65 to 90%. 8. Zinc is applied to the wire exposed on the surface of the rope.
The rope for operation according to claim 1, wherein the element wire which is plated with an aluminum alloy and which is not exposed on the surface is provided with a zinc plating layer.