JPH0622483B2 - Method for producing polyhedral chains - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a polyhedral chain in which hollow polyhedra are connected in a chain.

[0002]

2. Description of the Related Art Polyhedral chains in which hollow polyhedra are connected in a chain are well known. FIG. 10 is a perspective view showing one hollow polyhedron, and this polyhedron is manufactured by cutting the outer surface of a hollow sphere with a diamond tool or the like to form a large number of flat surfaces.

To form a polyhedron as shown in FIG.
As shown in FIG. 3, using hollow spheres 3 having holes 1 and 2 at opposite positions, fixing rods 4 and 5 are abutted on the holes 1 and 2, and the sphere 3 is sandwiched by the rods 4 and 5 from both sides. Fix it. In this state, when the diamond tool 9 having the blade 6 parallel to the center line C1 of the sphere 3 and the blades 7 and 8 of 120 degrees with respect to the parallel blade 6 is rotated around the rotation center C2,
As shown in FIG. 12, a plane 10 parallel to the center line C1 and planes 11 and 12 of 120 degrees with respect to this plane are formed.

Thus, three planes 10, 11 and 12 are formed at the positions where the diamond bite 9 hits. When this sphere is viewed from the hole 1 or 2 side, it becomes as shown in FIG. That is, the planes 10, 11 and 12 are formed only at the positions where the blades 6, 7 and 8 of the diamond cutting tool 9 contact.

Next, when the rods 4 and 5 and the sphere 3 are fixed by being rotated by 60 degrees, the diamond cutting tool 9 is used again to perform cutting operation six times in total, and three surfaces (10, 10,
(11, 12) x 6 = 18, giving a total of 18 polyhedra.

According to the conventional method for producing a polyhedral chain, after forming a polyhedron from independent spheres in this way, a thread, a wire, a thin chain or the like is passed through a large number of polyhedrons by using the holes 1 and 2 to form a polyhedral chain. It has a polyhedral chain.

[0007]

However, in such a structure in which the thread is passed, the thread is easily cut, and once the thread is cut, a large number of polyhedrons fall out from the thread at one time and are scattered, and the polyhedron is lost. There is a problem that it is easy to do.
In addition, the work of threading a large number of polyhedrons is troublesome.
Further, it is troublesome to cut the rods 1 and 5 one by one with the tips of the rods 4 and 5 pressed and fixed from both sides, and the manufacturing efficiency decreases.

The technical problem of the present invention is to realize a method for producing a polyhedral chain, which pays attention to such a problem, enables a large number of polyhedra to be rigidly connected with a metal, and can be efficiently produced.

[0009]

FIG. 1 is a process diagram for explaining the basic principle of a method for producing a polyhedral chain according to the present invention, and FIGS. 2 to 6 are examples of each production process. In the method of the present invention, first, a core rod 13 in which large diameter portions 16 and 17 having a narrowed portion 15 for separation in the middle and small diameter portions 14 are alternately formed at regular intervals is inserted into a pipe 18. The pipe 18 is drawn, and the position corresponding to the small diameter portion 14 of the pipe is narrowed down, thereby forming the portion corresponding to the large diameter portions 16 and 17 into a spherical shape and producing the connected body 21 of the spherical body 20. To do.

In such a state that a large number of spheres 20 are integrally connected, each sphere 20 is cut one by one to form the polyhedron 24.

After each sphere 20 is processed into a polyhedron to form a connected body of polyhedrons 24, the narrowed portion 19 and the constricted portion 15 of the core rod 13 are separated.

The second aspect of the present invention is, as described above, a large number of spheres 20.
In the state where they are integrally connected, when processing each sphere 20 into a polyhedron 24 one by one, on both sides of the sphere 20 to be cut, the connected body 21 of the sphere 20 is held, and the cutting work is performed. is there.

[0013]

[Operation] In the step (3) of FIG. 1, since many spheres 20 are integrally connected, when one sphere 20 is processed into a polyhedron, all the spheres 20 are slid together to form one sphere. A large number of polyhedrons 24 can be produced by simply doing this, and unlike the conventional method, one sphere is sandwiched from both sides and fixed, and when processing is finished, it is removed and the next sphere is set, and the troublesome work is no longer required. Is improved and it is rich in mass productivity.

Further, when the polyhedron connecting body, in which each sphere is processed into a polyhedron, is separated by the narrowing portion 19 between the polyhedrons 24,
At the same time, the core rod 13 inside is also broken at the constricted portion 15. Then, at both ends of each small-diameter portion 14, there are large-diameter portions 16 and 17, and since the large-diameter portions 16 and 17 are located inside the holes of the polyhedron,
The core rod 13 does not come out of the holes 1 and 2, and the polyhedrons 24 are connected by the core rods 13 in a chain shape. As a result, it is not necessary to thread a thread through a large number of pre-processed polyhedrons as in the conventional case, and the manufacturing efficiency is improved in this respect as well.

Moreover, since they are connected by the metal core rod 13, the chains are not easily broken, and even if they are cut, the polyhedrons are not scattered and can be easily repaired and reused. Is.

According to a method of holding the connecting body 21 of the spherical body 20 on both sides and processing the intermediate spherical body 20 into a polyhedron as in claim 2, the connecting body 21 is intermittently rotated and slides one by one. By only repeating the work, it is possible to continuously and automatically process the polyhedron, and it is possible to process the polyhedron stably, reliably and easily without breaking the drawing part 19 during the processing of the polyhedron. it can.

[0017]

EXAMPLES Next, examples will be used to explain how the method for producing polyhedral chains according to the present invention is actually embodied. Figure 2
Shows the step (1) in FIG. Reference numeral 13 denotes a core rod, and by drawing a wire rod, large diameter portions 16 and 17 having a narrowed portion 15 for separation and small diameter portions 14 are alternately formed at regular intervals. Reference numeral 18 is a pipe, and the core rod 13 is inserted into the pipe 18.

FIG. 3 is a view showing a pipe drawing method by a molding machine. With the core rod 13 in the pipe 18 fixed so as not to shift, first use a shallow mold to narrow down the position corresponding to the small diameter portion 14 of the core rod of the pipe, and form a shallow bellows shape as shown in (1). To form. Next, using a somewhat deep mold, similarly, the position corresponding to the small diameter portion 14 of the core rod of the pipe is further narrowed down to form a somewhat deep bellows shape as shown in (2).

In this way, by gradually narrowing down with a deep mold, the inner diameter of the narrowed portion 19 becomes larger than the large diameter portion 1 as shown in (3).
Narrow down until it is sufficiently smaller than the outer diameter of 6, 17.
Further, as a result, the pipe 18 has a shape in which a large number of spherical bodies 20 are integrally connected. Moreover, the large diameter portions 16 and 17 of the core rod 13 are located in the sphere 20.

The pipe 18 is drawn to such an extent that the drawn portion 19 is not broken when the pipe 18 is processed into a polyhedron in a later step.

FIG. 4 shows a process of processing the sphere 20 into a polyhedron. A sphere connecting body 21 in which the sphere 20 and the narrowed portion 19 are formed alternately and at regular intervals is a holder 22 at two places. twenty three
Being pinched by. Then, the exposed sphere 20 between the holders 22 and 23 is cut by a cutting machine such as the diamond cutting tool 9 to form a polyhedron. The cutting method is basically the same as the conventional processing method shown in FIGS.

That is, the connected body 21 of spheres is attached to the holder 22,
The outer surface of the exposed sphere 20 is cut with the diamond bite 9 while sandwiching and fixed by 23 to form three flat surfaces, and then the holders 22, 23 while holding the connected body 21 of the spheres.
After being rotated by 60 degrees, the diamond bite 9 again forms three planes. By repeating such cutting 6 times, the 18-sided polyhedron 24 is formed.

Note that this number of faces is an example, and the number of faces of the polyhedron can be further increased by making the rotation angle smaller and making the diamond cutting tool 9 have four or more blades.

When one polyhedron is formed, the holder 2
2 and 23 are opened, and the sphere connecting body 21 is slid to the left by one sphere, and the next sphere 20 is moved to the processing position, that is, the front of the diamond cutting tool 9. Then, the spherical connecting body 21 is again held by the holders 22 and 23, and the surface of the exposed intermediate sphere 20 is ground by the diamond cutting tool 9 to be processed into a polyhedron.

In this way, by repeating the work of moving the sphere connecting body 21 by one sphere and processing it into the polyhedron 24 by the diamond bite 9, the connecting body of the polyhedron 24 as shown in FIG. 5 is obtained. Done. When an external force in a folding direction is applied to the connected body of the polyhedrons 24, the connected body of the polyhedrons 24 is broken at each narrowed portion 19 because the narrowed portion 19 is thin and the strength is weak.

If the narrowed portion 19 is too strong to be easily broken, the polyhedron 24 is rotated while being held by the holder, and a bite 25 is applied to the narrowed portion 19 to make a notch before folding. Alternatively, you can send byte 25 until the polyhedra are separated.

Further, in the inner core rod 13, since the constricted portion 15 has the weakest strength, the connecting body of the outer polyhedron 24 may be broken,
When separated, an external force is applied to the inner core rod 13 and the core rod 13 is broken at the constricted portion 15 and separated. FIG. 6 shows a state where the connecting body of the polyhedron 24 and the core rod 13 are separated one by one in this way.

Each polyhedron 24 is separated one by one, and inside each polyhedron 24, the large-diameter portions 16 and 17 at the ends of each small-diameter portion 14 are located inside the holes 1 and 2. Since the large-diameter portions 16 and 17 are located and are larger than the holes 1 and 2, the polyhedrons 24 are not separated but become a firmly connected chain. FIG. 7 is a perspective view of the chain of polyhedra 24 shown in FIG.

Next, as shown in FIG. 4, a holder for holding the spherical connecting body 21 will be exemplified. The embodiment of FIG. 8 has a structure in which U-shaped holders 26 and 27 are butted against each other. That is, the holding heads 22a and 23a are integrated via the connecting portion 28, and the holding heads 22b and 23b are connected to the connecting portion 29.
Are integrated through.

Semi-circular grooves 30a and 31a are formed on the surfaces of the holding heads 22a and 23a on the holder 27 side, and the holding heads 22b and 23b are formed on the surface of the holder 26 side.
Semicircular grooves 30b and 31b are formed.

As shown in (2), the two holders 26, 27
Closed, between the semicircular grooves 30a and 30b,
The connecting body 21 of the sphere 20 is sandwiched between 31a and 31b, and the diamond bite 9 is lowered from the upper side into the U-shaped concave portion between the sandwiching heads 22a and 22b and the sandwiching heads 23a and 23b.
It is cut into a polyhedron by hitting 20. When rotating at a predetermined angle, unlike the embodiment of FIG. 4, as shown in (1), the two holders 26 and 27 are opened to release the clamping force,
After rotating only the connecting body 21 by a predetermined angle, the holders 26 and 27 are closed and pinched and fixed again as shown in (2).

FIG. 9 is a diagram illustrating the method of manufacturing the core rod 13 in the order of steps. First, while rotating a wire rod 32 having a wire diameter D as shown in (1), the wire rod 32 is tapped with a molding machine to be thin. That is,
As in (2), leave only the large-diameter parts 16 and 17, and tap the other parts to make them thinner. By repeating such work, the large-diameter parts 16, 17 are changed as shown in (1) → (2) → (3) → (4).
Except for the part that becomes, gradually become thinner. Also, the waist
15 is narrowed so as to be thinner than the small-diameter portion 14, and has the weakest strength. Therefore, the core rod 13 is inserted into the pipe 18 and fixed, and the pipe forms the sphere 20, and the polyhedron 24
When the connected body of the polyhedron 24 is separated by the narrowed portion 19 after processing into, the core rod 13 inside is easily broken and separated by the constricted portion 15.

[0033]

As described above, according to the present invention, in order to withstand the force at the time of processing into a polyhedron, a plurality of spherical bodies 20 are integrally connected, and the connecting body 21 is clamped to a predetermined position. The polyhedron 24 is formed by cutting with a cutting machine while intermittently rotating at an angle. Then, by repeating the work of sliding the sphere connecting body 21 by one sphere, re-holding it, and performing cutting work, in the state of an integrated connecting body, 1
Each piece is formed into a polyhedron. Then, after forming the required number of polyhedrons, the polyhedrons are separated from the narrowed portions 19 between the adjacent polyhedrons, and the constricted portions 15 of the core rod 13 inside are folded and separated.

Thus, according to the present invention, a large number of spheres
Since 20 can be processed into a polyhedron in the state of being connected together, processing is easy and suitable for mass production. Moreover, after the core rod 13 is inserted into the pipe in advance, the polyhedron 24 is processed and then the polyhedron 24 and the core rod 13 are separated. It is unnecessary, and the manufacturing efficiency is excellent also in this respect.

Unlike chains formed by threading a large number of polyhedra, the chains of the polyhedra are difficult to break because they are connected by the metal core rod 13. The core rods 13 that connect adjacent polyhedrons 24 are independent, and even if they break, the polyhedrons 24 do not scatter apart, so there is no risk of losing the polyhedron, and repair and reuse Is easy.

[Brief description of drawings]

FIG. 1 is a process diagram illustrating the basic principle of a method for producing a polyhedral chain according to the present invention.

FIG. 2 is a perspective view showing a step of inserting a core rod into a pipe.

FIG. 3 is a cross-sectional view showing a pipe drawing method in the order of steps.

FIG. 4 is a cross-sectional view showing a method for processing a polyhedron of a connected body of spheres.

FIG. 5 is a plan view showing a connected body of polyhedrons.

FIG. 6 is a cross-sectional view of a polyhedral chain.

FIG. 7 is a perspective view of a polyhedral chain.

FIG. 8 is a perspective view illustrating a holder of a connected body of spherical bodies.

FIG. 9 is a partial cross-sectional view illustrating the manufacturing method of the core rod in the order of steps.
It is a side view.

FIG. 10 is a perspective view illustrating one polyhedron.

FIG. 11 is a diagram showing a conventional method for manufacturing a polyhedron.

FIG. 12 is a diagram showing a sphere having three planes processed by the method of FIG.

13 is a side view of a sphere having three flat surfaces processed by the method of FIG. 11 as viewed from the hole side.

[Explanation of symbols]

 1,2 holes 3 spheres 4,5 fixing rods 6,7,8 diamond bite blades 9 diamond bite 10,11,12 planes 13 core rods 14 small diameter portion 15 constriction portion for separation 16,17 large diameter portion 18 Pipe 19 Throttle section 20 Sphere 21 Connected body of sphere 22,23 Holder 24 Polyhedron

Claims (2)

[Claims] 1. A pipe (18) with a core rod (13) in which large diameter parts (16, 17) having a constricted part (15) for separation and small diameter parts (14) are alternately formed at regular intervals. By narrowing the position corresponding to the small diameter portion 14 of the pipe 18, the portion corresponding to the large diameter portions 16 and 17 is formed into a spherical shape, and thus a large number of spherical bodies 20 are integrally formed. In a connected state, each sphere 20 is processed one by one to form a polyhedron 24, and after each sphere 20 is processed into a polyhedron 24, the narrowed portion 19 is separated and the constricted portion 15 of the core rod 13 is formed. A method for producing a polyhedral chain, characterized in that 2. As described above, in the state where a large number of spheres 20 are integrally connected, when each sphere 20 is processed into a polyhedron one by one, the connected body of the spheres 20 on both sides of the sphere 20 to be cut.
The method for producing a polyhedral chain according to claim 1, wherein cutting is performed while holding 21.