JP4805005B2 - Colored wire rope and colored wire rope manufacturing method - Google Patents

Description

  The present invention relates to a colored wire rope made of stainless steel. Specifically, the present invention relates to a technique for improving the peel strength of a coating applied to a colored wire rope made of stainless steel.

A wire rope is generally formed by twisting a plurality of strands and strands, and is used in various mechanical devices. When using a wire rope for a mechanical device where design is important, the wire rope is usually routed so that the wire rope is not exposed to the outside. However, depending on the mechanical device, a part of the wire rope may be exposed to the outside. For example, in a wire rope used in an opening / closing device for a power slide door of an automobile, a part of the wire rope is exposed to the outside when the door is opened. In such a case, if the color tone of the wire rope remains the color tone of the wire material (for example, the color tone of the steel wire), a sense of incongruity is generated between the surrounding colors and tone, which is not preferable. Therefore, in a mechanical device where design is important and when the wire rope is exposed to the outside, a colored wire rope whose surface is coated with a wire rope is used.
In the conventional method for manufacturing a colored wire rope, first, strands and strands are twisted together, a surface of the twisted strands is subjected to chemical conversion treatment, and then the surface is coated. The colored wire ropes manufactured in this way are peeled off by forming an oxide film with minute irregularities and improving the adhesion between the base metal and the coating film by chemical conversion treatment as a coating ground treatment. It is preventing.
In addition, as a prior art of a colored wire rope, the technique of patent document 1 is known, for example.

JP 2002-235290 A

  When the wire rope is exposed to the outside, a stainless steel wire rope is used for rust prevention. Even in the case of a wire rope made of stainless steel, if the color tone (silver color) of the material is not preferable, it is necessary to perform coating as in the case of a general steel wire rope. However, stainless steel wire rope is a material in which the effect of chemical conversion treatment is difficult to obtain. For this reason, even if the stainless steel wire rope is coated by a conventional method, the oxide film formed by the chemical conversion treatment cannot secure sufficient adhesion with the base metal, and the coating applied after that is not possible. Sufficient peel strength cannot be obtained. Therefore, there is a problem in that the coating is peeled off from the surface of the wire rope due to contact with the pulley surface or bending and stretching of the wire rope on the contact sliding surface between the wire rope and the pulley.

There is another pickling as a chemical surface treatment of the wire rope used conventionally. However, unlike ordinary steel wire ropes, stainless steel wire ropes have strong chemical resistance. Moreover, even if an oxidation reaction is possible, the oxide produced | generated by an oxidation reaction turns into a membrane | film | coat, and the progress of oxidation will be inhibited. Therefore, it is difficult to sufficiently form the desired amount of irregularities on the surface of the wire rope.
In addition, in the technique of patent document 1, peeling of a colored rope oil agent is prevented by applying a non-adhesive colored rope oil material that can form a protective oil film in a trough of the wire rope. It does not prevent peeling of the coating (colorant) applied to the entire surface of the film.

  This invention is made | formed in view of the situation mentioned above, The objective is to provide the technique which improves the peeling strength of the coating given to the wire rope surface made from stainless steel.

The colored wire rope made of stainless steel described in the present specification has a plurality of stainless steel strands twisted together and the surface thereof is coated. And the unevenness | corrugation is mechanically formed in the surface of the strand located at least on the surface of a wire rope, It is characterized by the above-mentioned.
In this colored wire rope, at least the wire located on the surface of the wire rope (the surface of the wire to be coated) is mechanically uneven. For this reason, it is possible to increase the surface roughness of the wire rope (surface roughness of the surface to which the coating is applied) and to improve the peel strength of the coating applied to the surface of the wire rope, compared to the chemical conversion treatment on the wire rope. can do.
In addition, with respect to the strands other than the strands positioned on the surface of the wire rope, it is not necessary to form irregularities on the surface, or irregularities may be formed on the surface. By forming irregularities on the surface of the strands other than the strands positioned on the surface of the wire rope, the twisting oil is held on the irregularities of the strands, and the durability of the wire rope can be maintained high.

It is preferable that irregularities extending in the axial direction of the strands are intermittently formed on the strand surface of the wire rope.
When the unevenness formed on the surface of the strand extends in the axial direction of the strand, the unevenness extending in the axial direction of the wire rope is also formed on the surface of the wire rope twisted together. For this reason, the peeling strength of coating can be made substantially uniform in the axial direction of the wire rope.

Moreover, this invention provides the manufacturing method which can manufacture the said colored wire rope suitably. The production method of the present invention is a method of producing a colored wire rope in which a surface of a wire rope obtained by twisting a plurality of strands of stainless steel is coated. From a stainless steel base material to a strand having a predetermined diameter. A step of drawing, a step of twisting a plurality of drawn wires, and a step of coating the surface of the twisted strands. And the unevenness | corrugation is formed in the surface of a strand by a wire drawing process, It is characterized by the above-mentioned.
In this manufacturing method, irregularities are formed on the surface of the strands when performing the wire drawing step. For this reason, an unevenness | corrugation can be formed in the surface of each strand, and an above-described colored wire rope can be manufactured efficiently.
In order to form irregularities on the surface of the strands in the wire drawing step, for example, the irregularities can be formed on the surface of the strands by making fine scratches on the processed surface of the wire drawing die. In addition, the surface roughness of the strand surface can be controlled by changing the design of the wire drawing die and the wire drawing process such as the material, shape, setting order, and surface roughness of the die.
In addition, it is preferable that the unevenness | corrugation from which surface roughness becomes 2.5 micrometers to 10 micrometers is formed in the surface of a strand by a wire drawing process.

In the manufacturing method described above, the strands are twisted together using twisted oil in the twisting step, and the method further includes a step of cleaning the surface of the strand group twisted between the twisting step and the coating step. It is preferable.
Since a plurality of strands are twisted together using twist oil, the strands can be smoothly twisted together. Also, since the twisted oil on the surface is washed before the painting process, there is no adverse effect on the painting, and by forming irregularities on the surface of all the strands, the strands inside the strands that have been twisted after washing Since the twisted oil remains, the durability of the wire rope can be kept high.

The main features of the techniques described in the following examples are listed.
(Embodiment 1) Concavity and convexity formation on the strand is performed with one or a plurality of wire drawing dies arranged at the final stage of the wire drawing step.
(Mode 2) The surface roughness of the wire is controlled by changing the design of the wire drawing die and the wire drawing process such as the material, shape, setting order, and surface roughness of the wire drawing die.

An embodiment embodying the present invention will be described with reference to the drawings. First, the structure of the stainless steel wire rope of a present Example is demonstrated with reference to FIGS. 1 is a cross-sectional view of the wire rope 1 of the present embodiment, FIG. 2 is a side view of the wire rope 1, FIG. 3 is a cross-sectional view of the core strand 10, and FIG.
As shown in FIG. 1, the colored wire rope 1 is produced by twisting eight side strands 20 around a core strand 10 as shown in FIG.
As shown in FIG. 3, the core strand 10 includes six first side strands 12 arranged around one core strand 11, and is adjacent to the first side strand 12 around the first side strand 12. Six third side strands 13 are arranged so as to be positioned in the concave portion of the side strand 12, and six second side strands 14 are arranged between the adjacent third side strands 13, and these The side strands 12 to 14 are simultaneously twisted in the same pitch and in the same direction, and are produced by parallel twisting so that the strands are in line contact with each other. The core strand 11 and the third side strand 13 are stainless steel wires having the same diameter (for example, φ = 0.21 mm), and the first side strand 12 is a stainless steel wire having a smaller diameter than the core strand 11 ( For example, φ = 0.20 mm) is used. The second side wire 14 is a stainless steel wire (for example, φ = 0.16 mm) having a smaller diameter than the first side wire 12. Unevenness is mechanically formed on the surface of each of the core strand 11, the first side strand 12, the second side strand 14, and the third side strand 13. It is preferable that the irregularities formed on the surfaces of the strands 11 to 14 extend intermittently in the axial direction of the strands. The unevenness formed on the surface of each of the strands 11 to 14 is set so that the surface roughness is 2.5 to 10 μm. When twisting each strand 11-14, twist oil is used, and twist oil remains between each strand 11-14.
As shown in FIG. 4, the side strand 20 is produced by twisting six side strands 22 around the core strand 21. For example, a stainless steel wire having a diameter of φ = 0.17 mm is used for the core strand 21, and a stainless steel wire having a diameter smaller than that of the core strand 21 (for example, φ = 0.16 mm) is used. Concavities and convexities are also mechanically formed on the surfaces of the core strand 21 and the side strand 22. It is preferable that the irregularities formed on the surfaces of the strands 21 and 22 also extend intermittently in the axial direction of the strands. The irregularities formed on the surfaces of the strands 21 and 22 are set so that the surface roughness is 2.5 to 10 μm. Twisting oil is also used when twisting the strands 21 and 22, and the twisting oil remains between the strands 21 and 22.
In addition, twisting oil is used also when twisting the core strand 10 and the side strand 20, and the twisting oil 30 adheres between the core strand 10 and the side strand 20. Further, the twisted oil 30 is removed from the surface of the wire rope 1 in which the core strand 10 and the side strand 20 are twisted together, and instead, the paint 40 is sprayed. Since mechanical irregularities are formed on the surfaces of the strands 21 and 22 constituting the side strand 20, the paint 40 applied to the surface of the wire rope 1 is difficult to peel off.

The manufacturing method of the wire rope 1 of a present Example is demonstrated with reference to FIG.
First, the strands 11 to 14, 21 and 22 constituting the wire rope 1 are manufactured by drawing a base material (φ1.0 mm) with a drawing die (drawing / surface treatment step K11). A plurality of wire drawing dies are used for the wire drawing treatment. Each time the base material passes through the wire drawing die, its diameter is gradually reduced. Of the plurality of wire drawing dies used for the wire drawing process, the wire drawing die arranged last has a rough processed surface. The surface roughness of the processing surface of the wire drawing die arranged last is set according to the surface roughness of the strands 11 to 14, 21 and 22 (for example, 2.5 to 10.0 μm). A plurality of wire drawing dies having a rough processed surface may be arranged at the rearmost part. By setting the die surface of the wire drawing die to be rough, mechanical irregularities are formed on the surfaces of the strands 11 to 14, 21 and 22. The unevenness formed on the surface extends in the axial direction of the strands and is intermittently formed in the axial direction. In addition, the roughness of the unevenness | corrugation formed in the surface of the strands 11-14, 21, 22 can also be controlled by adjusting the schedule and material of a wire drawing die. Therefore, for example, it can be achieved by increasing or decreasing the number of dies of the wire drawing machine, changing the area reduction rate, or shifting the finished diameter from the die conditions performed in the conventional wire drawing process. it can. These conditions may be performed alone or in combination. Moreover, the said surface treatment is implemented within the normal wire drawing process of a wire drawing machine. However, after performing the wire drawing process in the conventional wire drawing process, a surface treatment process may be added separately. Furthermore, a desired surface treatment can also be achieved by appropriately combining the order of folding into the wire drawing step using a die made of a cemented carbide and / or diamond.

Next, the produced strands 11-14 are twisted together to produce the core strand 10, and the strands 21, 22 are twisted together to produce the side strand 20 (primary twisting step K12). Twisting oil is used when the strands 11 to 14 are twisted together, and twisting oil is also used when the strands 21 and 22 are twisted together. Since the surface of each of the strands 11 to 14, 21, and 22 is uneven, the twisted oil enters the surface of the strands of each of the strands 11 to 14, 21, and 22 and is held on the surface. It has become.
Next, the side strand 20 is twisted around the core strand 10, and the wire rope 1 is produced (finish twist process K13). In the finishing twisting process, twisting oil is used when twisting the side strand 20 on the core strand 10. As a result, the twisted oil is also retained between the core strand 10 and the side strand 20.
Next, it wash | cleans in order to drop the twist oil adhering to the surface of the wire rope 1 (washing | cleaning process K14). At this time, the twisting oil on the surface of the wire rope 1 is removed, but the twisting oil between the core strand 10 and the side strand 20 and the twisting oil between the strands 11 to 14, 21 and 22 are removed. It remains without. In particular, since unevenness is formed on the surface of each of the strands 11 to 14, 21, 22, the twisted oil easily remains due to the unevenness.
The surface of the cleaned wire rope 1 is coated with a paint and naturally dried (painting process K15). Thereby, the surface of the wire rope 1 is painted in a desired color. In addition, since the bottom twisting process, the finishing twisting process, the cleaning process, and the painting process are the same as the conventionally implemented method, detailed description is omitted here.

As is apparent from the above description, in the manufacturing method of the present embodiment, only the surface of the wire is roughened in the wire drawing step, and the subsequent steps are the same as in the prior art. Moreover, in order to make the surface of each strand 11-14, 21, 22 rough, the surface of the wire rope 1 in which these strands 11-14, 21, 22 are twisted also becomes rough, and the coating 40 applied to the surface. It is possible to improve the peel strength.
In addition, the twisting oil used in the lower twisting process and the finishing twisting process is washed away by the washing process, but since all the strand surfaces are formed coarsely, the strands are twisted in the recesses on the strand surface inside the wire rope. Oil remains. The remaining twisted oil becomes a lubricating oil for strands and strands when bending stress acts on the wire rope, and can suppress wear that adversely affects the bending durability of the wire rope.
In addition to the method of the present embodiment, various methods such as shot peening, honing, polishing, and grinding can be used as a method for roughening the surface of the strand. However, in the method of the present embodiment, it is only necessary to change the wire drawing die used in the wire drawing step, so that the cost required for improving the coating strength can be kept low compared with other methods. it can.

Next, the result of actually manufacturing the wire rope according to the above-described embodiment and measuring the coating peel strength and durability of the wire rope will be described. In order to measure the paint peel strength and durability, a pulley bending durability test was performed on the wire rope.
The test was conducted on six types of stainless steel wire ropes shown in Table 1. The wire ropes 1 to 6 were all twisted by the same method as that of the wire rope 1 of this example, and the wire diameter was φ1.8 mm. The wire ropes 1 to 3 are wire ropes according to this example, and in the wire drawing process, irregularities were formed on the surfaces of all the strands, and the surfaces were painted. The surface roughness of the wire rope 1 was 2.5 μm, the surface roughness of the wire rope 2 was 10 μm, and the surface roughness of the wire rope 3 was 15 μm. The wire ropes 4 to 6 were manufactured as comparative examples. The wire ropes 4 and 5 are not mechanically uneven on the surface of the strands, and are twisted in the same manner as the wire rope 1 and then subjected to chemical conversion treatment using zinc phosphate, and the surfaces are coated. gave. The wire rope 4 was subjected to a chemical conversion treatment for 5 minutes, and its surface roughness was 2 μm. The wire rope 5 was subjected to chemical conversion treatment for 10 minutes, and the surface roughness was 2 μm. Moreover, the wire rope 6 was a rope produced without performing surface treatment, and it did not paint.

In FIG. 6, the schematic diagram of the test apparatus used for the pulley bending durability test is shown. The test apparatus 100 is arranged in an air cylinder 102 attached to one end of the wire rope 101, a weight 106 attached to the other end of the wire rope 101, and an intermediate portion of the wire rope 101, and guides the wire rope 101 so as to be able to advance and retreat. Pulleys 103 and 104 to be configured. The air cylinder 102 is driven so as to repeatedly pull and push the wire rope 101 at a stroke of 100 mm and a frequency of 0.33 Hz. As shown in FIG. 7, the pulley 103 has a wire holding portion 103a formed on the outer periphery thereof. The wire holding portion 103a has a substantially V-shaped cross section, an opening angle of 30 °, and a V-shaped bottom radius of 1.5 mm. As shown in FIG. 7, the pulley 104 also has a wire holding portion 104a formed on the outer peripheral portion thereof. The wire holding portion 104a is a groove having a substantially V-shaped cross section, and has an opening angle of 30 ° and a V-shaped bottom radius of 1.5 mm. The pulley diameters of the pulleys 103 and 104 are both 28 mm in groove bottom diameter.
The wire rope 101 routed from the air cylinder 102 is guided substantially vertically downward via the wire holding portion 103a of the pulley 103 and the wire holding portion 104a of the pulley 104. The wire rope 101 is wound around the pulley 103 by about 180 ° and the pulley 104 by about 90 °. A weight 106 is attached to the tip of the wire rope 101 guided vertically downward by the pulley 104. The weight of the weight 106 is 10 KG. Therefore, tension is applied to the wire rope 101 by the weight 106. The wire rope 101 is moved back and forth by the stroke of the air cylinder 102 and the weight 106 moves up and down, so that the wire rope 101 receives bending stress at the pulleys 103 and 104.

  In the pulley bending endurance test, the portion of the wire rope 101 that receives bending stress by the pulleys 103 and 104 is observed, and the number of strokes when the coating of the wire rope 101 starts peeling and the number of strokes when the wire rope 101 breaks are shown. It was measured. Table 1 shows the results.

  As a result of the test, the wire ropes 1, 2, 3 of this example (wire ropes in which irregularities are formed on the strands in the wire drawing process) have higher peel strength than the wire ropes 4, 5 coated after the chemical conversion treatment. It was. In addition, each of the wire ropes 1, 2, 3 was more durable than the wire ropes 4, 5. The wire rope 3 had higher peel strength than the wire ropes 1 and 2. The wire ropes 1 and 2 were more durable than the wire rope 3. In particular, the durability of the wire ropes 1 and 2 was not different from that of the wire rope 6 that was not surface-treated. From the above, it was found that the wire rope of this example can improve the coating peel strength, and in particular, high durability can be obtained when the surface roughness is in the range of 2.5 μm to 10 μm.

  In this embodiment, the wire rope has a double twist structure (FIG. 1). However, the technology of the present invention can be applied to various wire ropes (for example, a single twist structure) in addition to the wire rope having a double twist structure. It can be applied to wire rope). In the present invention, the wire rope is a general term for a plurality of strands or strands twisted together, and therefore includes what is called a cable in addition to what is called a wire rope.

Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.
In the above-described embodiment, the unevenness is formed on the surfaces of all the strands 11 to 14, 21, and 22. Peel strength can be improved. For example, it is not always necessary to form irregularities on the surfaces of the strands 11 to 14 constituting the core strand 10 and the core strands 21 of the side strands 20, and irregularities are formed only on the surfaces of the side strands 22 of the side strands 20. Just do it. Even with such a configuration, the peel strength of the coating can be improved. At this time, a significant difference in durability could not be confirmed between a wire rope having irregularities formed on all the strands and a wire rope having irregularities formed only on the side strands 22.
In addition, the technical elements described in the present specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

Sectional drawing of the wire rope which concerns on a present Example. The side view of a wire rope. Sectional drawing of a core strand. Sectional drawing of a side strand. The flowchart which shows the manufacturing process of a wire rope. The schematic diagram of the pulley bending durability test apparatus of a wire rope. VII-VII sectional drawing of FIG.

Explanation of symbols

10: Core strand 20: Side strands 11, 21: Core strands 12-14, 22: Side strands 30: Twisted oil

Claims (2)

It is a method of manufacturing a colored wire rope in which the surface of the wire rope obtained by twisting a plurality of strands of stainless steel is coated,
A step of drawing from a stainless steel base material to a strand of a predetermined diameter;
A step of twisting a plurality of drawn wires;
Coating the surface of the twisted strands,
A method for producing a colored wire rope, wherein irregularities having a surface roughness of 2.5 μm to 10 μm are formed on the surface of the strand by a wire drawing step. In the twisting step, strands are twisted together using twisted oil, and the method further comprises a step of cleaning the surface of the strands twisted between the twisting step and the coating step. Item 2. A colored wire rope manufacturing method according to Item 1 .

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