JPS6162637A - Method of forming annular hook using steel sleeve at end of steel cable - Google Patents

Abstract

PURPOSE:To facilitate the formation of an annular hook of steel cable by untwisting and halving an end of a steel cable and crossing annularly these branched strands to leave and twist the ends of the respective branched strands to each other so that they are caulked together with the original cable portion by a metal sleeve. CONSTITUTION:To form an annular hook 16, an end of a steel cable 13 is first untwisted and halved into branched strands 14, 15 which are crossed annularly. Next, one branched strand is twisted with the other one to leave the ends 14, 15. And finally the respective ends of the branched strands and original cable are caulked by the use of a metal sleeve 10 to complete the operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention relates to a method of forming an annular hook using a steel metal sleeve at the end of a steel cable.

[Conventional technology]

Conventionally, when using steel cables, as shown in Figure 10, the ends of the steel cables are bent back in an annular shape, and the strands at the same ends are twisted into the strands of the main cable. The hooks were machined and joined together to form an annular hook portion 2. The so-called "satsuma processing" is carried out, and Fig. 11 (a),
As shown in (b) and FIGS. 12(a) and (b),
By compressing and caulking the inside of the strands of the main cable portion from the outside, the strands are brought into close contact with and bit into the periphery of each strand, and are fastened together by the frictional bonding force.

[Problem that the invention seeks to solve]

However, in the former method, the twisting and hanging at the end of the steel cable are processed, that is, the main rope part and the strand at the end of the steel cable are once untwisted. Not only does it take a considerable amount of man-hours and labor to process the split inserts by twisting them together so that they are entwined with each other, such as making round inserts or half inserts, but even after the processing, there are In many cases, the individual wires forming the strand at the end of the steel cable inevitably protrude around the main cable section, and while handling the steel cable, the handler
Otherwise, it is dangerous because there is a risk of damaging the surrounding area, and its strength efficiency (processed steel cable strength / unprocessed steel cable strength There is a disadvantage that there is a large difference depending on the thickness, and in the case of the latter method, the knotted part is susceptible to corrosion and heat, and it is also difficult to work because it gets caught when slinging and removing beads. It had the following drawbacks.

[Means to solve the problem]

In view of these conventional drawbacks, this origin J has developed an annular hooking section at the end of a steel cable that effectively improves the means for forming an annular section at the end of the steel cable and the means for connecting the end of the steel cable at the annular section. This method provides a method for forming a shape with one end having a hollow circular cross-sectional shape.
The other end is formed into a member with a hollow conical cross section, making it extremely tough and viscous! Using an R4 metal sleeve, untwist the ends of the steel cables and divide them into two, take out one set of branch strands, cross each of these branch strands in a circular shape, and connect one branch strand to the other. a step of twisting the branch wire strands into a helical shape and leaving an end portion of each branch wire strand, and superposing the end portions of each branch wire strand on the main cable portion, and attaching the steel metal sleeve to the overlapped portion. A process of fitting the hollow circular cross-sectional shape so that the end face side faces the annular crossing part side, and pressing the W4 metal sleeve from the outside with a set of dies, so that the sleeve forms a conical circular shape on the main cable part side. This method of forming an annular hook part using a fully bent steel sleeve at the end of a steel cable is characterized by comprising the step of compressing and caulking until a cross section is formed and joining the overlapping parts.

〔Example〕

Hereinafter, an embodiment of the method for forming an annular hooking part using a steel metal sleeve at the end of a steel cable according to the present invention will be described in Fig. 1(a).
), (b), (c) to FIG. 8 for detailed explanation.

FIGS. 1(a), 1(b), and 1(c) are half-cut front views and left and right end views showing an example of the structure of a steel metal sleeve applied to this embodiment method.

In these FIGS. 1(a), (b), and (c), the steel metal sleeve lO applied to this embodiment method is as follows:
As the material, for example, low carbon steel with the following four-part composition ratio is used. Namely.

C amount = 0.1% or less (0.07~0.08% suitable Lk
)SiQ=0.1% or less (0.03-0.06% appropriate amount)
Mn Hr = 0, 5% or less (0.34-0.41
% appropriate amount) P amount = 0.04X or less S amount = o, osz or less is allowed, and with this material, as is clear from the same figures, one end 11 has a hollow circular cross-sectional shape, and the other end 12 has a hollow conical shape In order to form a member and impart appropriate toughness and viscosity to the member, for example, the following heat treatment is performed.

Namely.

Quenching (950°C x 1 hour) Oil cooling or water cooling or normalizing at 900°C The grain size of r
Obtain grain size numbers 8 to 10 specified in JIS G 0552J steel ferrite grain size test.

FIGS. 2(a) to 2(e) sequentially show the steps of twisting and assembling the annular hooking portion by untwisting and twisting the ends of the steel cables according to the method of this embodiment.

First, the tips of the steel cables 13 are twisted back so as to be divided into two in the twisting direction, and a set of two branch wire strands 14 is made.
, 15 (see figure (a)), and then intersect each branch line strand 14 and 15 to form a ring (see figure (b)), and intersect one branch line strand 14 with the other. The branch line strands 15 of the branch line 15 are twisted in a spiral shape and entwined with each other (see 'A (c)), and the other branch line strand 15 is similarly twisted with respect to one branch line strand 14. In this way, each branch line strand 14, 15 is firmly twisted in a mutually reinforcing state and connected to each other in a ring shape, and each The annular hooking portion 18 is formed by processing all but the end portions 14a and 15a of each branch line (FIG. 1(e)).

Next, as shown in FIGS. 3(a) and 3(b), the branch line nutland ends 14a and 15a of the annular hooking part 16 obtained as described above are tied to the main cable part, and The steel metal sleeve 10 is fitted into this joining part with the one end 11 side, that is, the end face side of the hollow circular cross-sectional shape facing the annular hooking part 1B side, and by this fitting, Each strand end 14a, 15a
The ends of the individual strands are also sealed inside to prevent their protruding ends from being exposed to the outside.

Further, FIG. 4 shows a roughing die for roughly compression caulking, that is, rough swaging, the steel metal sleeve 1o, and this roughing die 17 has caulking grooves each having a semicircular cross section on each opposing surface. 18a.

Each set consists of upper and lower dice 18 and 19 having +9a.

The rough compression and tightening operation using the rough die 17 is performed sequentially in the steps shown in FIGS. 5(a) to 5(d).

That is, first, the long-sleeve direction of the elliptical cross-section is inclined by about 30 to 45 degrees with respect to the operating direction of the upper and lower die sets 18 and 19 (see figure (a)), and in this state, each die is initially The set die spacing A was gradually reduced until it reached a swage amount of about A/2 (see figure (b)), and then the protruding parts from the previous process were rearranged at the same angle. (Fig. 6 (C)), the rough die surfaces are compressed again until the swage amount is in contact with each other (Fig. 6 (C)), and then, by polishing and removing the slightly remaining pars, as shown in Fig. 6 ( a
) and (b), the steel metal sleeve 10, which originally had an elliptical cross-sectional shape, has a part of its material that gets into the gaps between the overlapping strands and strands, and its length increases. The strands are stretched in the axial direction by about 12 to 15% to 8 degrees, and the cross-sections of these strands and strands are as close to circular as possible, and they are firmly crimped together. , rough swage crimped annular catch part 1
You can get 6.

Next, FIG. 7 shows a finishing die for final compression caulking, that is, finish swaging, of the copper threaded sleeve 10 which has been roughly swaged and pressed. Finish caulking grooves 21a, 22a with a finished cross-sectional shape are provided on each opposing surface of the
It consists of upper and lower finishing dies 21 and 22, respectively. By means of the finishing die 20, both ends of the roughly swaged steel metal sleeve 10 are gently caulked and the whole is shaped, as shown in FIG. As a result, the joints of the superimposed strands can be completely covered with the steel metal sleeve 10 to form an annular catch 16 which is more firmly connected to each other.

In addition, FIGS. 9(a) to 9(C) sequentially show how the cross-sectional shape and axial shape of the steel metal sleeve 10 change due to swaging in this embodiment method, and in this case, This is an example of the actual dimensions of a steel metal sleeve that is applied to a steel cable with a so-called 1/2 nominal diameter, which is the most common and standard metal steel cable.

That is, the figure (a) shows the shape and dimensions of the sleeve before swaging, and the length Aa=51. Oval part side length Ba = 37° circle jli part side length Ca = 14. Ellipse end side major axis Da=3
6. Inertia circle end side short diameter Ea=24. Conical end diameter Fa=
22, and the figure (b) shows the shape and dimensions of the sleeve after rough swaging, with length Ab = 58 and elliptical part side length B.
b=54, cone side length Cb=4. Ellipse end major axis D
b-25, ellipse end side short diameter Eb 251 yen GI [end side diameter Fb = 22, and the same figure (C) is the shape and dimensions of the sleeve after finishing swaging, length Ac = 58
, ellipse inner side length Bc・452 conical part side length Qc=13.
Oval end side major axis Dc-25, oval end side minor axis Ec-25
One cone end side diameter Fc=18. As is clear from the changes in the cross-sectional shape and axial shape of the steel metal sleeve 10 in each of these figures, a portion of the material is trapped in the gaps between the overlapping strands and strands, as described above. As the wires enter, the joints of the twisted wires are
It is completely covered within the sleeve, including the protrusions at the ends, and can be firmly joined together.

In the case of this steel cable with a nominal diameter of 1/2, according to the results of a tensile load test on the final product, the applied load was 84.
Even if the steel cable itself breaks at 0.00 kg, caulking using the swaged steel metal sleeve 10 does not cause any damage to the joint, and it has been confirmed that this is an extremely reliable method of forming an annular hook. Obtained.

[,□,,,□.

As described in detail above, when using the method of the present invention, a steel metal sleeve having a hollow elliptical shape at one end and a hollow conical shape at the other end is used, and each end of the steel cable is first twisted back and divided into two parts. Since the branch line strands are crossed in a circular manner and one branch line strand is twisted around the other branch line strand in a spiral shape, the annular part itself can be formed strongly and effectively by each branch line strand. , the load applied to this annular part can be evenly distributed, and with the ends of each branch strand superimposed on the main cable part, the steel metal sleeve is attached to this overlap part, and the hollow ellipse is The sleeve is fitted with the end face facing the annular intersection side, and this sleeve is pressed from the outside with a pair of dies to compress and caulk the sleeve until it has a conical circular cross section on the main part side. Since the joint is made at the overlapping part, together with the formation of the annular part, a joint with high breaking strength can be obtained, and the steel metal sleeve has toughness and viscosity. , has excellent heat resistance and corrosion resistance, and because the joints are covered with a steel metal sleeve, there is no danger when operating and handling the steel cable, and it is also beneficial for safety. It is.

[Brief explanation of the drawing]

Figures 1 to 9 show an embodiment of the method for forming an annular hook part using a steel metal sleeve at the end of a steel cable according to the present invention, and Figures 1 (a), (b), ( C) is a half-cut front view showing the steel metal sleeve used in the same example method;
2(a) to 2(e) are both left and right end views, and FIG. a)
, (b) is an explanatory perspective view showing the state in which the steel metal sleeve is fitted to the annular portion of the above, and a partial sectional view of the same is shown in FIG. 4. FIG. Explanatory perspective view showing the dice, FIG. 5(a)
6(a) and 6(b) are explanatory perspective views showing a rough swaged state of the same steel metal sleeve; Fig. 7 is an explanatory perspective view showing a finishing die for final compression caulking, that is, finish swaging, of the steel fully bent sleeve, and Fig. 8 is an explanatory perspective view showing the state of the annular hook part finished by the finishing die. The perspective views and FIGS. 9(a) to 9(c) are front views sequentially showing how the cross-sectional shape and axial shape of the steel metal sleeve change due to swaging in this embodiment method. These are both left and right end views, and FIG. 10 to Ti512 show the annular hooking part according to the conventional example of the above. FIG. 10 is an explanatory perspective view showing the annular hooking part of the above, and FIG. 11(a),
12(b) and FIGS. 12(a) and 12(b) are explanatory diagrams showing fitting and compression caulking using different sleeves, respectively. 10...Steel metal sleeve, 11.12...Hollow elliptical cross-sectional end of steel metal sleeve, hollow conical cross-sectional end, 13...Steel cable, 14.15... Branch line strand, +4a, 15a... Branch line strand end, 16... Annular hooking part, 17... Coarse die, 18.19... Upper, lower phase die, 18a, 19a
... each caulking groove of the upper and lower phase dies, 20 ... finishing die, 21.22 ... upper and lower finishing dies,
21a, 22a...Each caulking groove of the upper and lower finishing dies. Patent applicant: Nikko Metal Co., Ltd. (Company agent: Patent attorney Takashi Suzue - Figure 1 is between C3

Claims (1)

[Claims] A method for forming an annular hook at the end of a steel cable, the method involves forming a metal sleeve made of steel with high toughness and viscosity, in which one end has a hollow circular cross-section and the other end has a hollow conical cross-section. Using this method, the tip of the steel cable is twisted back and divided into two parts, a set of branch strands are taken out, each of these branch strands is crossed in a circular manner, and one branch strand is coiled around the other branch strand. The step of twisting and leaving the ends of each branch line strand, overlapping the ends of each branch line strand on the main cable part, and attaching the steel metal sleeve to this overlap part with its hollow circular cross-sectional shape The step of fitting the steel metal sleeve so that the end face side faces the annular intersection side, and pressing the steel metal sleeve from the outside with a set of dies until the sleeve has a conical circular cross section on the main rope side. A method for forming an annular hook using a steel metal sleeve at the end of a steel cable, comprising the step of crimping to join the overlapping portions.