JP2001299418A - Manufacturing method for jointless ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jointless ring of a high quality which is finished by hand from a raw metal, keeps 'superiority in quality' of the ring metal and is produced without qualitative unevenness owned, and keeping superior of the ring metal and without qualitative unevenness of the product. SOLUTION: A small hole 2 is drilled at the center of the thick plate-form raw material 1, and in the small hole 2, the conical working tip section 4 of a punch 3 is inserted. Then, the head section 5 of the punch is hit by a mullet, and the hole diameter is slightly expanded in a press processing. Such a press processing is repeatedly performed from both sides of the raw material. Thus, the hole diameter is expanded to a ring size in the end, and the ring metal 1a is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to gold (gold),
The present invention relates to a method for manufacturing a seamless ring applied to a ring made of a noble metal such as platinum (platinum).

[0002]

2. Description of the Related Art Conventionally, in the production of seamless rings,
A method of obtaining a ring-shaped ring ingot from a punched piece punched from a noble metal plate of appropriate thickness, a method of cutting a pipe-shaped material into appropriate dimensions to obtain a ring-shaped ring ingot, A method of obtaining a ring bullion by casting (molding), forming two or more single rings made of noble metal plates of different colors in a washer shape, and brazing the opposite side surfaces of these rings side by side. There is a method of obtaining a ring bullion by sticking.

[0003] In the above-described method of manufacturing a seamless ring, a ring ingot is used as a ring having various three-dimensional designs around the ring or embedding a jewel to give a three-dimensional decorative effect. By cast molding,
Alternatively, it is provided by a single-piece production in which an operator makes full use of a high level of skill to finish the material manually.

[0004]

By the way, when the ring ingot is formed by casting, it is possible to realize a design of a concave and convex shape using a mold, so that a ring of the same shape can be easily produced. There is a limit to the detail.

[0005] Therefore, when a more delicate pattern is to be applied, a cutting technique or the like in which an operator finishes a ring using an engraving machine, a cutting machine, or the like is used.

[0006] Such a ring ingot is a ring formed by casting, and a ring that is equivalent to the production of a single item finished using the skill of an operator, and a forging technique is adopted from a material using the same noble metal. In the case of a ring that is completely hand-worked by workers, the appearance of the ring is the same as the quality of the ring metal due to the texture, surface decoration, unique design, overall finish, etc. Even if you can feel it, there is a difference in an invisible place such as a feeling of weight when holding the ring in your hand. In other words, if the manufacturing process for obtaining the ring bullion is different, even if the ring has exactly the same form in appearance, the hand of the ring bullion is cast-manufactured, and the ring of which the worker has completely finished by hand is a hand. There is a difference in quality due to the feeling of weight when holding it.

Therefore, the present invention aims at simplifying the process of obtaining a ring bullion for a ring made of a noble metal which is manually finished by an operator by adopting a forging method from a material and also has a structure in which the ring bullion has The purpose is to provide a high-quality ring with improved “quality” and no quality variation.

[0008]

In order to achieve the above object, a method of manufacturing a seamless ring according to the present invention uses a punch having a small hole in the center of a thick plate-shaped material and having a conical machining point. Then, insert a punched part into a small hole from one side of the material, press the punch head to hammer the punch, perform a press process to expand a small amount of hole diameter, then turn the material over and press the same as above. It is characterized in that, by repeating pressing from both sides of the material to enlarge a small amount of the hole diameter, the hole diameter is finally increased to the ring size to obtain a ring ingot.

Here, as the thick plate material of the noble metal used in the present invention, a noble metal such as gold, silver or platinum or an alloy thereof is used, and the size and thickness of the material are processed into a ring ingot. It can be determined empirically in consideration of the finishing process after finishing. The material is circular, and the diameter of the hole firstly drilled in the center is about 2 to 5 mm.

As described above, according to the method for manufacturing a seamless ring of the present invention, a punched conical tip is inserted into a small hole drilled in the center of a thick plate material, and the punch head is hammered. Pressing to increase the diameter of a small amount of hole is repeated from both sides of the material, and finally the hole diameter is increased to the size of the ring.
The processing can be simplified without any particular skill.

In addition, as the hole diameter expanding operation (press working) is repeated many times, the material is naturally stretched in the circumferential direction around the hole and the systematic compaction action from the hole side to the radial direction. In addition, the hardness gradually increases, so that compared to cast ingots made of the same precious metal, ring ingots increase in weight, improve the “good quality” of ring ingots, and improve quality. A high quality ring ingot with no variation is obtained.

The ring slab thus obtained is finished into a ring by a well-known method, but the hardness of the metal slab of the ring slab is uniformly generated in each part of the ring slab, and the flow of the metal structure is circular. Since there is no variation in the strength of each part, there is also a restriction on the processing, and the processing can be performed as desired and the workability is excellent.

[0013] In the ring ingot, the hole surface expanded to the ring size is formed into a round cross-section with a convex central portion by squeezing using a punch from both sides of the material. The hole surface has a smooth surface made of a dense metal structure, which is a preferable form as a ring. Therefore, the ring ingot whose hole diameter has been expanded to the ring size can be processed into a required shape at a portion other than the hole surface to complete the ring. Thus, no special processing is required for the hole surface when finishing the ring, and the number of finishing steps can be reduced.

[0014]

Embodiments of the present invention will be specifically described below with reference to the drawings.

FIGS. 1 (a) and 1 (b) are perspective views of a material according to the present invention, FIGS. 2 (a), 2 (b) and 2 (c) are explanatory views showing press working, and FIGS. 3 (a) and 3 (a). FIG. 4B is an explanatory view showing the finishing, and FIG. 4 is a sectional view of the ring showing a basic form of the completed ring.

As shown in FIG. 1A, the material 1 is made of a circular noble metal plate having an appropriate thickness, and a noble metal such as gold, silver, platinum or the like, or an alloy thereof is used. The size, thickness, and the like of the material 1 are empirically determined in consideration of the form in which the ring is finally finished.

As shown in FIG. 1 (b), a small hole 2 is formed in the blank 1 using a drill at the center. The hole diameter is about 2 to 5 mm.

As shown in FIG. 2 (a), a punch 3 having a conical tip 4 is inserted into the small hole 2, and the punch 4 is inserted into the small hole 2 from one side of the raw material 1. Then, a punching process is performed to hammer the punch head 5 to enlarge a small amount of the hole diameter. Next, the material 1 is turned upside down and the same press working as described above is performed to enlarge a small amount of the hole diameter. Such pressing is repeated from both sides of the material, and FIG.
As shown in (c), the hole diameter is gradually increased, and finally, the hole diameter is increased to the ring size to obtain the ring ingot 1a. The press working may be a press working using a simple press machine such as a screw type, instead of hammering. Further, the shape of the processing end portion 4 of the punch 3 used for the pressing may be a conical shape that curves from the middle to the small diameter side.

The ring ingot 1a thus obtained is shown in FIG.
As shown in (a) and (b), a predetermined process is performed on the outer peripheral surface by a well-known method to finish a ring A (a basic shape is shown in FIG. 4) as shown in FIG. Here, the hole surface 2a of the ring ingot 1a whose diameter has been expanded to the ring size is formed into a round cross-sectional convex surface having a bulging central portion by repeatedly performing press working using the punch 3 from both sides of the material, Since the hole surface 2a presents a smooth surface, which is a preferred form for the ring A, no special processing is required for the hole surface 2a, and the entire ring can be fully used as the ring A with the last hanging hook.

[0020]

The present invention is embodied in the form described above. According to the present invention, a small hole drilled in the center of a material is gradually expanded by using a punch to finally reduce the hole diameter. Since a ring ingot is obtained by adopting a forging method for expanding the diameter to the ring size, the processing can be simplified. In addition, compared with cast ingots made of the same precious metal, ring ingots have a greater weight, improve the “good quality” of ring ingots, and provide high quality rings without quality variations. it can. Further, since the hole whose diameter has been increased by repeating the press working becomes a preferable form for the ring, the number of steps for finishing the ring can be reduced without requiring any special processing on the hole surface.

[Brief description of the drawings]

1A and 1B are perspective views of a material according to the present invention.

FIGS. 2A, 2B, and 2C are explanatory diagrams showing press working on a material.

FIGS. 3 (a) and 3 (b) are explanatory views showing a finishing process of a ring bullion according to the present invention.

FIG. 4 is a sectional view of the ring showing a basic form of the completed ring.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Material 2 Small hole 3 Punch 4 Conical processing tip 5 Punch head 1a Ring ingot 2a Hole surface A Ring

Claims (2)

[Claims] 1. A punch having a small hole in the center of a thick plate-shaped material, a punch having a conical machining point, a punching point of the punch is inserted into the small hole from one side of the material, and the punch head is hammered. Pressing to increase the diameter of a small amount of the hole diameter is performed. A method for producing a seamless ring, characterized in that a diameter is increased to a ring size to obtain a ring ingot. 2. The seamless ring according to claim 1, wherein the ring metal whose hole diameter has been expanded to the ring size is processed into a required shape by processing a portion other than the hole surface into a required shape. Production method.