JP6093549B2 - Stainless steel wire for operation - Google Patents

Description

  The present invention relates to a stainless steel wire for operation. More specifically, the present invention relates to a stainless steel wire for operation having excellent durability.

  The operation wire is routed between the operation unit and the operation target object while securing a degree of freedom of wiring, such as by providing a bent part, and is pulled or pushed according to the operation of the operation unit. Tell the operating force to. In general, the tensile strength of a wire is used as a physical property value as a substitute characteristic of durability in a pulling operation, with a good correlation in durability evaluation in a wire arrangement using a steel wire.

Patent Document 1 includes a steel core portion obtained by twisting a plurality of core strands formed by twisting a plurality of wires, and a side portion including a plurality of side strands twisted around the steel core portion. In the high tension wire rope provided, the constituent wire of the steel core portion is made of a stainless steel wire having a tensile strength of 1760 ± 20 N / mm ² , and the constituent wire of the side portion is stainless steel having a tensile strength of 1860 ± 20 N / mm ² . A high-strength wire rope is disclosed, which is made of a steel wire and has an elongation of the steel core portion substantially equal to that of the side portion.

JP 11-093089 A

  However, unlike a steel wire, a wire using stainless steel does not correlate with tensile strength and durability for pulling operation, and even a wire with good tensile strength has poor durability. For this reason, it has been difficult to obtain a stainless steel wire having good durability with respect to a wire using a stainless steel wire. And since the wire rope using the stainless steel strand described in patent document 1 pays attention only to the tensile strength of a wire, the stainless steel wire which has sufficient durability cannot necessarily be obtained. Therefore, in view of such circumstances, an object of the present invention is to provide a stainless steel wire for operation excellent in durability without depending only on the tensile strength of the wire.

  The stainless steel wire for operation according to the present invention is a stainless steel wire for operation that is routed between the operation portion and the operation target and uses stainless steel as a material, and the number of twists of the wire is 15 times or more. And

  The stainless steel wire for operation is a stranded wire of stainless steel wire, and each stainless steel wire is preferably twisted 10 times or more.

The stainless steel wires preferably have a tensile strength of 2400 to 3000 N / mm ² , respectively.

The stainless steel wires preferably have a tensile strength of 2500 to 2800 N / mm ² , respectively.

  The conventional stainless steel wire has a durability of about 30,000 times in the durability test. However, if the stainless steel wire of the present invention is used, a durability of 120,000 times or more can be obtained and a repeated operation is required. It can be used without problems even at the site. Furthermore, since the stainless steel wire of the present invention has good durability, it is possible to reduce the diameter within a range corresponding to the breaking load of the wire with respect to the load load, and a bending with a smaller bending radius. Can be used for routing.

It is sectional drawing which shows an example of the structure of the stainless steel wire for operation of this invention. It is a graph which shows the relationship between the tensile strength of a stainless steel wire, and the frequency | count of durability. It is a graph which shows the relationship between the frequency | count of twist of a stainless steel wire, and durability.

  Hereinafter, a stainless steel wire for operation (hereinafter simply referred to as a wire) of the present invention will be described with reference to the accompanying drawings.

  The wire of the present invention includes an operation unit operated to apply a pulling or pushing operation to the wire, and a position where the wire is pulled or pushed by operating the operation unit and separated from the operation unit via the wire. Between the operation target to be operated in The operation unit and the operation target are not particularly limited as long as the operation unit and the operation target can operate the wire and are operated by the wire. The wire of the present invention can be used for window regulators, parking brakes, fuel lid actuators, bike screens, and the like. Moreover, the wire of this invention is applicable also to uses other than a vehicle.

  An example of the structure of the wire of the present invention is shown in FIG. The wire 1 shown in FIG. 1 has a so-called double twist structure in which a core strand 11 and eight side strands 12 around the core strand 11 are twisted together. The core strand 11 is formed by twisting 19 strands by Warrington twist, and the side strand 12 is formed by twisting 7 strands (W (19) + 8 × 7).

  In the embodiment shown in FIG. 1, the core strand 11 has six core strand first side strands 11b arranged around one core strand core strand 11a, and two adjacent core strand firsts. Six core strand second side strands 11c are arranged between the side strands 11b so as to be in contact with the two core strand first side strands 11b. Furthermore, between the six core strand second side strands 11c, six core strand third side strands 11d having a diameter smaller than that of the core strand first side strand 11b are arranged, and the core strand second side The strand 11c and the core strand third side strand 11d are configured to be inscribed in one circle. The side strand 12 is formed by twisting six side strand side strands 12b around the side strand core strand 12a.

  The twisting method (S twisting, Z twisting, etc.) and pitch of the core strand 11 and the side strand 12 can be appropriately changed according to the intended use. The wire 1 shown in FIG. 1 has a Warrington type parallel twist structure, but may be a seal type, a filler type, a Warrington seal type, or a cross twist. Furthermore, although the difference is provided in the diameter of the strand used, the same diameter may be sufficient. Moreover, although the wire 1 of the double twist structure is shown in FIG. 1, as long as it can have an effect equivalent to the effect mentioned later, it can also be set as another double twist structure or a single twist structure. Moreover, the diameter of each strand used for the wire 1 and the diameter of the wire 1 as a whole can be appropriately changed according to the intended use as long as the effects described later can be obtained. In other words, the wire as a whole basically depends on the durability of the strands that make up the entire wire, so if the durability of the strands increases, the durability also increases accordingly. As a result, the degree of freedom of selection will be expanded.

  In the wire 1 of the present invention, stainless steel is used as the material of the wire. As the stainless steel, any austenitic stainless steel may be used. For example, SUS302, SUS304, SUS316 or the like is used, and a wire can be obtained by drawing these stainless steel materials.

  The present invention uses a wire in which stainless steel is used for such a material, and the number of twists of the wire 1 is 15 or more. Here, “the number of twists” of the wire 1 means that the strands are firmly gripped at an interval 100 times the diameter of the wire 1 and are twisted to such an extent that the strands do not bend, while the twisting speed is 60 rpm in one direction. The number of twists until the wire 1 is rotated and cut and obtained by averaging the number of twists of all the strands used for the wire 1. As a result of intensive studies, the present inventor has found that the durability of the wire 1 is remarkably improved by setting the number of twists to 15 or more. The present invention will be described later by paying attention to the number of twists that has not been used in the past as an index for improving the durability of a wire routed between an operation unit provided with a bent portion and an operation target. Thus, compared with the conventional wire which paid attention only to the tensile strength, it realized realizing remarkable durability stably. In particular, in a wire using stainless steel as a raw material whose tensile strength and durability for pulling operation do not correlate with each other, the present invention surely improves the durability and obtains a remarkable durability as compared with a conventional wire. That is what happened.

  The number of twists may vary in the number of twists between the strands, but each of the stainless steel strands used for the wire 1 preferably has a twist count of 10 or more. By setting the number of twists of each strand to 10 or more, there is no variation between the strands, the balance in the wire 1 is improved, and excellent durability can be obtained.

  It is considered that the presence of the austenite structure and martensite structure of the stainless steel used for the wire 1 is considered as a factor that the wire 1 of the present invention has remarkable durability. In general, it is known that when austenitic stainless steel is strained by processing, a processing-induced martensitic transformation occurs and a part of the austenitic structure is transformed into a martensitic structure. The austenite structure has a relatively low strength but is ductile, and the martensite structure has a high strength but is brittle. Therefore, when austenitic stainless steel is processed, the austenite structure and the martensite structure coexist, but when the volume ratio of the martensite structure increases, the ductility decreases but the strength increases. That is, when the wire 1 is routed and the push-pull operation is repeated, strain is applied at the bent portion to generate a martensite structure, and the newly generated high-strength martensite structure suppresses local deformation. Further, it is considered that the load applied to the wire 1 is dispersed and the durability of the wire 1 is improved. The inventor has found that the wire 1 having the number of twists of 15 or more can disperse the load applied to the wire 1 in this way and improve the durability of the wire 1.

Each of the stainless steel wires used for the wire 1 preferably has a tensile strength of 2400 to 3000 N / mm ² , and more preferably 2500 to 2800 N / mm ² . By setting the tensile strength of the wire 1 to 2400 to 3000 N / mm ² , the durability of the wire 1 can be further improved, and the wire 1 can be easily routed between the operation unit and the operation object. An excellent wire can be provided, and durability can be further improved by setting the tensile strength of the wire 1 to 2500 to 2800 N / mm ² . When the tensile strength is less than 2400 N / mm ² , the breaking strength of the wire 1 is low and the operation cannot be endured. On the other hand, those having a tensile strength greater than 3000 N / mm ² are difficult to manufacture with austenitic stainless steel.

  As described above, the conventional stainless steel wire has a durability of about 30,000 times in the durability test. However, if the stainless steel wire for operation of the present invention is used, it can be used without problems even after 120,000 times. Can do.

  Moreover, since the stainless steel wire for operation of the present invention has good durability, it can be used for bending wiring with a smaller bending radius. Furthermore, since it is excellent in durability, the diameter of the wire can be reduced in use as a wire having the same performance as the conventional one, and space and resources can be saved.

  EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated concretely, this invention is not limited only to these Examples.

  First, the number of twists, tensile strength, and durability measured in Examples and Comparative Examples will be described.

(Number of twists)
The number of twists is twisted until the strands are firmly gripped at an interval of 100 times the diameter and are twisted to the extent that the strands do not bend while rotating at a twisting speed of 60 rpm in one direction. Obtained by counting the number of times. The number of twists of the wire was an average value of all the strands constituting the wire.

(Tensile strength)
The tensile strength was measured according to JIS Z 2241, and the tensile strength was calculated from the breaking load. The tensile strength of the wire was the average value of all the strands constituting the wire.

(Durability test)
The durability test was measured by a test method similar to the “Durability Test Method Using Roller” described in JP-A-5-230783. That is, first, a 10 kg weight was connected to one end of a wire to be tested having a total length of 10,000 mm, and the other end of the wire was fixed to an air cylinder. The wire was turned 90 ° with the roller and then turned 180 ° with the other roller, and when the wire moved a predetermined stroke, the weight was placed in contact with the stopper to stop the movement. . As for the roller, each of the following roller conditions was used so that each of the air cylinders would rotate if it reciprocated. After moving the air cylinder to generate force until the weight hits the stopper and the wire tension reaches 35 kgf, hold the tension for 0.5 seconds and then move in the opposite direction to One cycle of the durability test was set. At this time, the stroke of the reciprocating motion of the wire was 100 mm, the speed was 20 reciprocations / minute, and olefin-based grease was sufficiently applied to the contact portion between the wire and the roller. The air cylinder was repeatedly reciprocated until the wire to be tested was broken, and the number of cycles of the reciprocating movement when the wire was broken was defined as the durability number.
Roller condition: groove bottom diameter 30 mm, material nylon 6, groove bottom cross section inner radius 1.0 mm, groove angle 30 °

Example 1
Austenitic stainless steel SUS302 steel was drawn at a drawing speed of 300 m / min and a lubricating oil temperature of 40 ° C., and the diameters were 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm. I got the wire. These strands were twisted to produce a 1.5 mm diameter wire having the structure shown in FIG. In FIG. 1, a strand having a diameter of 0.17 mm is used for the core strand core wire 11a, and a strand having a diameter of 0.16 mm is used for the core strand first side strand 11b. A strand having a diameter of 0.17 mm is used for the strand 11 c, a strand having a diameter of 0.13 mm is used for the core strand third side strand 11 d, and a diameter of 0.15 mm is used for the side strand core strand 12 a. The strand of 0.14 mm in diameter was used for the side strand side strand 12b.

(Example 2)
A wire was produced under the same conditions and structure as in Example 1 except that the steel material of austenitic stainless steel SUS302 was drawn at a drawing speed of 300 m / min and a lubricating oil temperature of 45 ° C. Got.

(Example 3)
A wire was produced under the same conditions and structure as in Example 1, except that the steel material of austenitic stainless steel SUS302 was drawn at a drawing speed of 150 m / min and a lubricating oil temperature of 50 ° C. Got.

Example 4
A wire was produced under the same conditions and structure as in Example 1 except that the steel material of austenitic stainless steel SUS302 was drawn at a drawing speed of 300 m / min and a lubricating oil temperature of 25 ° C. Got.

(Example 5)
A wire of Example 5 was prepared under the same conditions and structure as in Example 1 except that the steel material of austenitic stainless steel SUS302 was drawn at a drawing speed of 600 m / min and a lubricating oil temperature of 35 ° C. Got.

(Example 6)
A wire of Example 6 was prepared under the same conditions and structure as in Example 1 except that the steel material of austenitic stainless steel SUS302 was drawn at a drawing speed of 600 m / min and a lubricating oil temperature of 45 ° C. Got.

(Example 7)
A wire of Example 7 was prepared under the same conditions and structure as in Example 1 except that the steel material of austenitic stainless steel SUS302 was drawn at a drawing speed of 600 m / min and a lubricating oil temperature of 40 ° C. Got.

(Example 8)
A wire of Example 8 was prepared under the same conditions and structure as in Example 1 except that the steel material of austenitic stainless steel SUS302 was drawn at a drawing speed of 300 m / min and a lubricating oil temperature of 35 ° C. Got.

(Comparative Example 1)
A wire was produced under the same conditions and structure as in Example 1 except that the steel material of austenitic stainless steel SUS302 was drawn at a drawing speed of 150 m / min and a lubricating oil temperature of 15 ° C. Got.

(Comparative Example 2)
A wire was produced under the same conditions and structure as in Example 1 except that austenitic stainless steel SUS302 was drawn at a drawing speed of 300 m / min and a lubricating oil temperature of 15 ° C. Got.

(Comparative Example 3)
A wire was produced under the same conditions and structure as in Example 1 except that the steel material of austenitic stainless steel SUS302 was drawn at a drawing speed of 600 m / min and a lubricating oil temperature of 15 ° C. Got.

(Comparative Example 4)
A wire was produced under the same conditions and structure as in Example 1 except that austenitic stainless steel SUS302 was drawn at a drawing speed of 600 m / min and a lubricating oil temperature of 20 ° C. Got.

  Regarding the wires of Examples 1 to 8 and Comparative Examples 1 to 4, the average number of twists of all the strands constituting the wires and the average tensile strength of all the strands were the values shown in Table 1 below. . Moreover, the above-mentioned durability test was done about Examples 1-8 and Comparative Examples 1-4. The results are shown in Table 1. 2 shows the relationship between the tensile strength based on the data in Table 1 and the number of times of durability, and FIG. 3 shows the relationship between the number of twists based on the data in Table 1 and the number of times of durability.

  When comparing Examples 1 to 8 and Comparative Examples 1 to 4 in Table 1, any of the examples in which the number of twists of the wire is 15 times or more has an endurance number of 120,000 times or more, compared with the comparative example. It can be seen that the number of endurance is very large. In particular, each of the examples has a durability of 3 to 14 times or more compared to the wire of the comparative example in which the number of twists used in conventional window regulators is 4.5 times, 5 times, and 6 times. Yes. From the above, it can be seen that the wire of this example has significantly superior durability compared to the wire of the comparative example.

Of the examples in which the number of twists of the wire is 15 or more, Examples 1, 2, and 4 to 8 have a tensile strength in the range of 2500 to 2800 N / mm ² , and the number of twists described above is 4. It can be seen that it has a durability of 150,000 times or more, which is 3.75 to 14 times or more compared with the wires of Comparative Examples 1 to 4, which are 5 times, 5 times and 6 times. From this, it can be seen that the wire having the number of twists of 15 or more and the tensile strength in the range of 2500 to 2800 N / mm ² has significantly superior durability.

  Next, it can be seen from the graph of FIG. 2 that there is no clear correlation between the tensile strength and the durability. In particular, it can be seen that Comparative Examples 1 to 4 have very few durability times compared to the Examples in any tensile strength. From this, it can be seen that even if only the tensile strength of the wire is controlled, it is not possible to obtain a durability of 120,000 times or more, and it is not possible to stably obtain a wire having excellent durability. On the other hand, it can be seen from the graph of FIG. 3 that the number of endurance increases as the number of twists increases. Regardless of the value of the tensile strength, it can be seen that if the number of twists is 15 times or more, the durability number is 120,000 times or more. From this, it can be seen that by controlling the number of twists of the wire, it is possible to obtain a durability number of 120,000 times or more and to obtain a wire having excellent durability. Further, it can be seen from the graph of FIG. 3 that when the number of twists is the same, the durability is increased as the tensile strength is increased. From this, basically, a wire with sufficiently excellent durability can be obtained by controlling the number of twists of the wire to 15 times or more. However, by controlling the tensile strength together, further excellent durability can be obtained. It can be seen that a wire having the same can be obtained.

1 Stainless steel wire for operation 11 Core strand 11a Core strand core wire 11b Core strand first side strand 11c Core strand second side strand 11d Core strand third side strand 12 side strand 12a Side strand core strand 12b Side strand Side wire

Claims (5)

It is routed between the operation portion and the operation target, an operating stainless wire with stainless steel material, twist number of wires Ri der least 15 times, the tensile strength of each 2400~3000N / mm ² An operation stainless steel wire having a durability of 120,000 times or more . The operating stainless wire is stranded wire stainless steel strands, wherein the stainless steel wire has a tensile operation stainless wire of claim 1 strength of each 2500~2800N / mm ^2. A window regulator using the stainless steel wire for operation according to claim 1. A parking brake using the stainless steel wire for operation according to claim 1 or 2. A fuel lid actuator using the stainless steel wire for operation according to claim 1.

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