JP2006241652A - Method for processing terminal socket for wire rope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for processing a terminal socket for wire rope, ensuring a terminal treatment of sufficient mechanical strength to be attained and having such advantages as to prevent human health from being affected because of using no metallic lead and enhance firmly adhering performance owing to good compatibility of the interim plating of metallic tin on the individual wires of wire rope and metallic zinc as cast metal with each other. <P>SOLUTION: The method comprises the following procedure: Wire rope 1 is engaged with a metallic socket 20, the terminal of the rope is untwisted and disaggregated into a strand 3 to expose a core steel 4 lying at the center. The exposed core steel 4 is cut off and the strand 3 is dismantled in a bamboo whisk-like form. The resultant dismantled part 5 is subjected to a 1st washing step and a 2nd washing step and then interim-plated with metallic tin. The resulting dismantled part 5 is drawn into the metallic socket 20, which is then injected and cast with metallic zinc. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a processing method for fixing a metal socket to the end of a wire rope, and more particularly, to make the metal socket completely lead-free.

  Conventionally, a metal socket is fixed to the end of a wire rope so as to be fastened and fixed to, for example, a mechanical device or a structure. The wire rope and the metal socket are generally fixed by an alloy fastening method. That is, a method is adopted in which the end of the wire rope is untwisted and disassembled into a strand to form a loose portion, and the loose portion is inserted into the hollow portion of the metal socket, and then the molten alloy is poured and fixed. (For example, see Patent Document 1)

Lead alloy, tin alloy, zinc, zinc alloy, etc. are used as the casting material alloy. Among them, it is inexpensive, has a low casting temperature, does not damage the strands, and has a high breaking strength. Currently, lead-based alloys are most frequently used for reasons.
JP-A-7-246298

  However, in recent years, the use of lead has been a problem with adverse effects on the human body, and when lead-containing materials are disposed of, lead that is harmful to the human body may be eluted, causing heavy metal contamination. Because of its large size, the industry as a whole has been trying to avoid the use of lead as much as possible, and so-called lead-free adoption that does not contain lead is also desired for the rope end fittings.

  The present invention has been researched and developed with the object of solving the above-mentioned problems, and the object of the present invention is to prevent the adverse effects on the body with lead-free, and to prevent tin from being applied to the wire rope strands. It is an object of the present invention to provide a wire rope terminal socket processing method capable of achieving a terminal treatment with sufficient strength by improving the fixing performance due to good compatibility between temporary plating and cast metal zinc.

  As means for solving the above problems and achieving the object, in the present invention, a metal socket is inserted into a wire rope, and the end of the rope is untwisted into a strand and disassembled to expose the core rope at the center. The exposed core rope is cut off, and the strands are separated into tea-like shapes. After the first washing step and the second washing step, the loose portions are pre-plated with tin, and then in the metal socket, the tea-like shape is separated. Developed and adopted a wire rope terminal socket processing method, which is characterized by drawing and casting zinc.

  Moreover, in the wire socket terminal socket processing method configured as described above, the first cleaning step is immersed in an organic solvent bath to clean grease and dirt, and the second cleaning step is 2 to 3 times as much hydrochloric acid. A wire characterized by immersing it in a liquid layer of about 10% zinc chloride dissolved in dilute hydrochloric acid to remove deposits such as rust, activating the surface and promoting the alloy reaction between the wire and tin Rope terminal socket processing method was developed and adopted.

  By performing the temporary plating with tin and the cast metal with zinc, the terminal socket processing becomes completely lead-free, eliminating the lead damage that causes harm to the body. In addition, since the temporary plating is performed with tin, it can be done at a relatively low temperature and can prevent the strength of the strands from being lowered. Also, the compatibility with the cast metal zinc is good, and the bonding performance between the strands of the wire rope and the metal socket Is improved, and the terminal fixing portion is sufficiently strong. Furthermore, there is no difference from the lead-based alloy in the breaking load, and the creep property is better when zinc is used than the lead-based alloy.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
First, the metal socket 20 to be attached to the end of the wire rope 1 is confirmed to be of a type that matches the configuration and diameter of the wire rope 1 and the size, and the tapered inner surface of the metal socket 20. 21 is visually inspected, and if there is a deposit, clean it with a cleaning solution. If the oil and fat are attached, the adhesion with the cast metal will be insufficient and cause an accident. Then, the cleaned metal socket 20 is inserted through the wire rope 1. (Figure 1)

  A shearing portion 2 for winding the plated iron wire is provided at a position 2 to 3 times the diameter from the end of the wire rope 1 to prevent loosening of the wire rope 1. (Figure 2)

  Unravel the rope from the end of the wire rope 1 to the sieving part 2 so that the strands 3 are evenly arranged. (Figure 3)

When the strand 3 is unwound, the heart rope 4 in the center is exposed, and the heart rope 4 is taken out of the strand 3 and cut from the root. (Figure 4)
In addition, in the steel core wire rope in which the core rope is made of a steel wire, the steel wire of the steel core is separated into a tea-like shape.

  The strands 3 are unraveled to the roots using tools such as spiking and pliers, and are spread like tea leaves to form the loose portions 5. (Figure 5)

  After shaping the entanglement of the loose part 5, extreme bending or overspreading, etc., and aligning the axis of the wire rope 1 with the axis of the loose part 5, the organic solvent cleaning liquid tank 6 in the first cleaning step is arranged. Immerse and remove rope grease and dirt. (Fig. 6)

  Subsequently, it is immersed in a cleaning tank 7 of a medium for the second cleaning step in which about 10% of zinc chloride is dissolved in dilute hydrochloric acid diluted with industrial hydrochloric acid 2 to 3 times to quickly remove deposits such as rust. At that time, soak so that it does not immerse in the place of Shiseing 2. (Fig. 7)

  Thereafter, the loosened portion 5 is gradually immersed in the tin plating tank 8 melted at 300 to 350 ° C. to adhere tin to the whole, and then the extra attached tin is dropped by hitting a pulling drop. (Fig. 8)

  Since this plating operation has a great influence on the fixing force, it must be plated up to the base of the sizing portion 2 so that all the strands are completely free of spots. If the temperature is outside the above range, the adhesion of tin is deteriorated, the plating action is not performed, and the fixing force with the cast metal is inferior.

  A 3-5% chemical soda solution is prepared and neutralized over the portion where acid is likely to remain in the portion other than the pre-plated portion.

  Then, the metal socket 20 is stopped at a predetermined position, and the separating portion 5 is pulled into the tapered inner surface 21 of the metal socket 20. At that time, the dispersal portions 5 are uniformly distributed on the tapered inner surface 21 of the metal socket 20. If the upper portion of the shizing portion 2 is not in the metal socket 20, there is a risk of causing corrosion or fatigue destruction, and fixing efficiency is deteriorated.

  The wire rope 1 is fixed with the vice 9 and set so that the wire rope 1 and the metal socket 20 are vertical. That is, by matching the axis of the wire rope 1 and the metal socket 20, the cast metal zinc can be evenly filled. (Fig. 9)

  Next, the cast metal is sealed with clay or the like so that the cast metal does not leak from the gap between the metal socket 20 and the wire rope 1, and is heated by the gas burner 10 so as to reach 100 to 150 ° C. from the outer surface of the metal socket 20. The fluidity is improved. (Fig. 10)

  The temperature in the tank 11 filled with the cast metal zinc is kept at 490 to 510 ° C., the solidified solid is removed, and the oxide on the metal surface is removed. (FIG. 11) Zinc is scooped up with the handle 12 and continuously poured into the metal socket 10. (FIG. 12) Zinc cast in the metal socket 20 is solidified, and the end of the wire rope 1 is integrally coupled to the metal socket 20 by this solidification. (FIG. 13) Then, the end of the wire rope 1 can be fastened to a predetermined part via the metal socket 20.

  The temperature at the time of zinc injection is 450 to 470 ° C., and if it is 450 ° C. or less, zinc is hard to be injected, and if it is 470 ° C. or more, the material is adversely affected, and the above range is suitable.

  According to the method for processing the end socket of the wire rope of the present invention configured as described above, zinc chloride is added to dilute hydrochloric acid obtained by diluting hydrochloric acid 2 to 3 times with the first washing step of immersing and washing in an organic solvent liquid bath. Temporary plating is carried out through a second cleaning step in which it is immersed in a solution layer of about 10% of the adsorbent and cleaned, so that the adhesion of tin for plating the strands is improved, and then the cast metal zinc is performed. It can be used with peace of mind as a terminal fixing part with sufficient strength and improved fixing strength. In addition, since the temporary plating is performed with tin, it can be performed at a relatively low temperature, and the strength of the wire is not reduced, and the lead is completely free of lead.

以上から明らかなように、３種類のロープとも鉛レスソケット加工方法と鉛系合金ソケット加工方法において、破断荷重は殆ど変わりがなく、完全な鉛フリーとなる本発明のソケット加工法に優位性があることが判明した。 Next, a break test was performed between the lead-less (tin-zinc) socket processing method of the present invention obtained in the above embodiment and the conventional lead-based alloy socket processing method. The results are shown in the table below.

As is clear from the above, in the three types of rope, in the lead-less socket processing method and the lead-based alloy socket processing method, the breaking load is almost the same, and the socket processing method of the present invention that is completely lead-free has an advantage. It turned out to be.

  As mentioned above, although main embodiment of this invention was described, this invention is not limited to these implementation, Various design is possible within the range which can achieve the objective of invention and does not deviate from the summary of invention. Modifications are possible and all fall within the scope of the present invention.

  The present invention is suitable for terminal processing of wire ropes used for construction civil engineering equipment, structures such as suspension bridges, crane equipment, ships, cableways, elevators, and the like.

It is the side view which inserted and inserted the metal socket in the rope. It is the side view which provided the shizing part in the rope. It is the side view which unraveled the rope end part to the strand. It is the side view which exposed the rope heart. It is a side view which unraveled the strand and made it the separation part. It is a longitudinal cross-sectional view of the state immersed in the washing | cleaning-liquid tank. It is a longitudinal cross-sectional view of the state immersed in the agent tank. It is a longitudinal cross-sectional view of the state immersed in the temporary plating tank. It is a front view of the state which set the rope and the metal socket. It is a front view of the state which is heating the metal socket. It is a longitudinal cross-sectional view of a casting metal tank. It is a longitudinal cross-sectional view of the state which has inject | poured zinc into the metal socket. It is a longitudinal cross-sectional view of the cast state.

Explanation of symbols

1 Wire rope 3 Strand 4 Core rope 5 Separated part 20 Metal socket

Claims (2)

  Insert a metal socket into the wire rope, untwist the end of the rope into a strand, disassemble to expose the core rope in the center, cut out the exposed core rope, and break the strand into a tea-like shape. The wire rope terminal is characterized in that after the first cleaning step and the second cleaning step are performed on the portion, the portion is provisionally plated with tin, and then the tea-like loose portion is drawn into the metal socket, and zinc is injected and cast. Socket processing method. In the first washing step, grease and dirt are washed by immersing in an organic solvent bath, and in the second washing step, a medium agent in which about 10% of zinc chloride is dissolved in dilute hydrochloric acid diluted with hydrochloric acid 2-3 times. The wire socket terminal socket processing method according to claim 1, wherein the wire rope terminal socket processing method according to claim 1, wherein the wire rope is immersed in a liquid layer to remove deposits such as rust to activate the surface and promote an alloy reaction between the wire and tin.

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