JPH08176982A - End treatment of wire rope - Google Patents

Abstract

PURPOSE: To provide an end treatment method of a wire rope capable of ensuring adhesiveness between a metal socket and stainless steel wires constituting the wire rope and easily carrying out a preplating by anyone without any skill. CONSTITUTION: This method for treating a wire end consists of a degreasing process where an end of a wire rope made of stainless steel is degreased, a first cleaning process where the degreased end of the rope is dipped and cleaned in a concentrated hydrochloric acid solution containing 3-20wt.% zinc, a second cleaning process where the cleaned end of the rope is dipped and cleaned in a zinc chloride solution, a preplating process where the cleaned rope end is preplated with a metal or an alloy having a low melting point and a socket making process where the preplated rope end 14a is surrounded by a mold 26 and a metal socket unit is formed by casting the molten metal or alloy having the low melting point into the mold 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire rope end treatment method for fixing the end portion of a wire rope such as a stainless steel rope to various structures or devices.

[0002]

2. Description of the Related Art For example, in the case of a submarine cable, in order to fix the terminal portion to a large structure such as a bridge pier, the terminal portion is processed into a socket. In the conventional socket processing, the rope end portion is degreased and washed, and the surface activated rope end portion is dipped in a molten metal bath and pre-plated (temporary plating).
Next, a mold is attached to the rope end portion, and molten metal is injected into this to form a socket-shaped end fixing portion. Then, this is inserted into a female cone and fixed to a member such as a structure.

Preliminary plating is a part of pretreatment for socket processing, and minute unevenness is generated on the surface of the rope-constituting element wire preliminarily plated, which causes the adhesion between the element wire and the cast metal. As a result, a safer and more reliable terminal fixing unit can be obtained.

In the conventional terminal treatment method, the wire surface is degreased and washed with a concentrated hydrochloric acid solution, and then further washed with a nitric acid solution, the element wire is rubbed with a wire brush to mark the surface, and pre-plated. Also, a small amount of zinc chloride is added to the molten alloy for pre-plating.

[0005]

However, in the conventional method, in the case of a wire rope made of a steel wire of a normal material, a sufficient amount of preliminary plating adheres to the surface of the wire, so that the desired fixing efficiency and strength can be obtained. However, in the case of a stainless steel wire rope, pre-plating hardly adheres to the wire surface, and desired fixing efficiency and strength cannot be obtained. It is possible to deposit a sufficient amount of plating on the stainless steel wire by performing a special and complicated process, but in this case, the operator must be a highly skilled person, resulting in high cost and variation in quality. Is also big.

The present invention has been made to solve the above-mentioned problems, and it is possible to secure the adhesion between the metal socket portion and the stainless steel wire forming the rope, and it is easy for anyone without skill. Another object of the present invention is to provide a wire rope terminal treatment method capable of pre-plating.

[0007]

The wire rope end treatment method according to the present invention comprises a degreasing step of degreasing the end portion of a stainless steel wire rope, and 3 to 20% by weight of zinc in the degreased rope end portion. A first washing step of immersing the washed rope end portion in a concentrated hydrochloric acid solution containing sol, a second washing step of immersing the washed rope end portion in a zinc chloride solution for washing, and a low melting point metal of the washed rope end portion Or a preliminary plating step of preliminarily plating with an alloy, and a socket forming step of forming a metal socket portion by surrounding a pre-plated rope end portion with a mold and casting a low melting point molten metal or alloy in the mold. , Are included.

In this case, in the first cleaning step, the concentration of 35
It is preferable to use a solution in which 6 to 19 wt% zinc is dissolved in a wt% concentrated hydrochloric acid solution. In the pre-plating process, Sn-Sb type alloy, Sn-Sb, which is generally called white metal
-Cu-based alloy, Sn-Sb-Pb-based alloy, Sn-Sb-
Zn-based alloy, Sn-Sb-Cu-Pb-based alloy, Sn-S
It is preferable to use a b-Cu-Zn-based alloy, a Sn-Sb-Pb-Zn-based alloy, or a Sn-Sb-Cu-Pb-Zn-based alloy. In the socket forming process, industrial pure zinc and Z
It is preferable to use a zinc-based alloy such as an n-Al alloy.

[0009]

In the first cleaning step of the wire rope end treatment method according to the present invention, the degreased rope end portion is removed by 3 to 3 times.
Since it is immersed in a concentrated hydrochloric acid solution containing 20% by weight of zinc, the passivated wire surface is activated and easily reacts with metal ions.

Further, since stainless steel wire is a material harder than ordinary steel wire, it is difficult to make many flaws on the surface by rubbing with a wire brush or the like, but the first and second cleaning methods of the present invention. Since fine irregularities are formed on the wire surface by the synergistic effect of the steps, a sufficient amount of pre-plating is attached.

Next, the preferable range of the hydrochloric acid solution component used in the first cleaning step will be described. When a concentrated hydrochloric acid solution having a concentration of 35% by weight is used as a stock solution and a solution in which 3 to 20% by weight of zinc is dissolved therein is used, white metal adheres well and the non-plated portion is reduced. In this case, a solution obtained by dissolving 5 to 19% by weight of zinc in concentrated hydrochloric acid is desirable,
A solution containing 6% by weight of zinc is most suitable.

The wire rope to be treated is SU
It is made by twisting S304, SUS316, and a stainless steel wire having strength and corrosion resistance equal to or higher than those of S304 and SUS316.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In this embodiment, a case will be described in which the end portion of the stainless steel wire rope is processed into a socket and fixed. [Preparation of Rope Terminal Section] As a wire rope to be subjected to terminal treatment, a wire rope having an IWSC7 × 19SS / O structure obtained by twisting JIS standard SUS304 stainless steel wires was used. The wire rope 14 has an outer diameter of 12 mm and is used for 200 handrail parts of the Kokura style suspension bridge.

The rope end portion 14a is bound at a proper position with a wire, and the tip end side is loosened from the wire binding portion. Immerse the unraveled portion in kerosene at a temperature of 70 ° C for 3 to 5 minutes,
Sufficiently degrease the oil adhering to the surface. Rope terminal 1
For unraveling 4a, each wire should be separated as much as possible. Before the degreasing, the surface of the wire may be rubbed with a wire brush to give a surface flaw. [Washing Treatment] 73 g of zinc was dissolved in 390 g of a concentrated hydrochloric acid solution having a concentration of 35% by weight to prepare a first washing liquid containing 19% by weight of zinc. Further, 24 g of zinc was dissolved in 390 g of a concentrated hydrochloric acid solution having a concentration of 35% by weight to prepare a second cleaning liquid containing 6% by weight of zinc.

Three sample ropes were prepared, the first cleaning liquid (19% by weight zinc-containing cleaning liquid) was used for the rope terminal portion of sample symbol B, and the second cleaning liquid was used for the rope terminal portion of sample symbol D. Cleaning solution (6% by weight zinc-containing cleaning solution)
Was washed with a concentrated hydrochloric acid solution having a concentration of 35% by weight for the rope end portion of sample symbol J.
The immersion cleaning time is about 3 minutes for samples B and D and about 10 seconds for sample J.

After the first cleaning treatment, each sample B,
D and J are immersed in a zinc chloride solution for about 5 seconds, and a second cleaning process is performed. The cleaning temperature in both the first and second cleaning processes is room temperature. [Pre-plating treatment] For pre-plating, Sn-Sb alloys, Sn-Sb-Cu alloys, which are generally called white metal,
Sn-Sb-Pb type alloy, Sn-Sb-Zn type alloy, S
n-Sb-Cu-Pb based alloy, Sn-Sb-Cu-Zn
Alloys, Sn-Sb-Pb-Zn alloys, Sn-Sb-
A Cu-Pb-Zn alloy is used. In this case, a small amount of zinc chloride may be added to the molten alloy for plating.

The end portions of the samples B, D and J are immersed in a molten alloy bath for plating for about 20 seconds to deposit the plating on the wire surface. The number of immersions in the molten alloy bath is 1
It is preferable that the number of times is not only the number of times but also a plurality of times. [Socket Processing] As shown in FIG. 1, the rope end portion 14 a treated as described above is inserted into the cavity 27 through the lower opening 28 of the mold 26. The cavity 27 has a cone shape with an upper diameter larger than a lower diameter. Figure 2
As shown in, the binding portion of the rope terminal portion 14a is positioned near the lower opening 28, and the gap between the openings 28 is marked with clay or the like. Cavity 27 through the upper opening 29 of the mold
Molten metal is cast inside. As the casting metal, for example, a zinc alloy such as industrial pure zinc or zinc aluminum alloy is used.

When molten metal is injected into the cavity 27,
The molten metal is rapidly cooled by the mold 26 and immediately solidifies.
The mold 26 is removed from the rope terminal portion 14a, and the cone type socket portion 30 is deburred.

Next, the socket portion 30 is sandwiched between jigs of a press machine and cold pressed. By this cold pressing, the bondability and the adhesiveness between the rope and the die-cast metal in the socket portion 30 are significantly improved. Then, the socket portion 30 is inserted into a female cone (not shown). The female cone is a divided structure formed by combining three or two members. When the rope is pulled in the direction opposite to the most distal end, the female cone is guided by the tapered surface of the socket portion 30, the female cone is pressed against the rope, and a so-called chucking action is generated by the female cone and the socket portion 30. By attaching the socket portion 30 to a structural member, the rope end portion 14a is firmly fixed.

As shown in FIGS. 3 and 4, when the amount of the pre-plating 32 adhered to the strand 31 is small, the adhesion between the strand and the cast metal is small, and the fixing strength of the rope end portion is insufficient.

On the other hand, as shown in FIG. 5 and FIG.
When the amount of the pre-plating 32 attached to 1 is large, the degree of adhesion between the wire and the cast metal is large, and the fixing strength of the rope end portion is necessary and sufficient.

FIG. 7 is a graph showing the results of comparing the method of the example and the method of the comparative example, in which the horizontal axis is the sample symbol and the vertical axis is the adhesion rate of the preliminary plating. .
As shown in FIGS. 3 and 5, the adhesion rate of the pre-plating is determined by observing the cut surface of the wire (element wire) 31 under a microscope, and the total circumference L ₁ of the adhesion plating 32 with respect to the total circumference L of each wire 31.
The ratio of (L ₂ ) is investigated and expressed as a percentage (%). In the sample symbols B and D of the examples, the adhesion rate of the preliminary plating was about 40%, and in the sample symbol J of the comparative example, the adhesion rate of the preliminary plating was about 20%.

[0023]

According to the present invention, the adhesion between the metal socket portion and the stainless steel wire forming the rope is significantly improved, and the terminal fixing portion having sufficient strength can be secured. The reliability of can be dramatically improved. Further, according to the present invention, anyone can easily and easily perform pretreatment and socket processing of the rope end portion without requiring skill.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a rope terminal portion and a mold.

FIG. 2 is a partial cross-sectional view showing a rope end portion and a fixing cone.

FIG. 3 is a cross-sectional view showing a steel wire forming a wire rope and preliminary plating attached to the steel wire.

FIG. 4 is a side view showing a steel wire forming a wire rope and preliminary plating attached to the steel wire.

FIG. 5 is a cross-sectional view showing a steel wire forming a wire rope and preliminary plating attached to the steel wire.

FIG. 6 is a side view showing a steel wire forming a wire rope and preliminary plating attached to the steel wire.

FIG. 7 is a diagram showing the effect of the present invention.

[Explanation of symbols]

 14 ... Wire rope 14a ... Rope terminal part 26 ... Mold 29 ... Metal socket part 31 ... Steel wire 32 ... Pre-plating

Claims (2)

[Claims] 1. A degreasing step of degreasing a terminal portion of a stainless steel wire rope, and a first cleaning step of dipping and cleaning the degreased rope terminal portion in a concentrated hydrochloric acid solution containing 3 to 20% by weight of zinc. And a second washing step of immersing the washed rope end portion in a zinc chloride solution for washing, a preliminary plating step of preliminarily plating the washed rope end portion with a metal or alloy having a low melting point, and a preliminary plating A method of terminal treatment of a wire rope, which comprises a step of surrounding a rope end portion with a mold and casting a low melting point molten metal or alloy in the mold to form a metal socket portion. 2. A solution obtained by dissolving 6 to 19% by weight of zinc in a concentrated hydrochloric acid solution having a concentration of 35% by weight is used in the first cleaning step, and Sn-generally referred to as white metal is used in the preliminary plating step.
Sb-based alloy, Sn-Sb-Cu-based alloy, Sn-Sb-P
b-based alloy, Sn-Sb-Zn-based alloy, Sn-Sb-Cu
-Pb based alloy, Sn-Sb-Cu-Zn based alloy, Sn-
Sb-Pb-Zn alloy, Sn-Sb-Cu-Pb-Z
2. The wire rope terminal treatment method according to claim 1, wherein an n-based alloy is used and a zinc-based alloy is used in the socket forming step.