JP3668412B2 - Seamless ring manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a seamless ring applied to a ring made of noble metal such as gold or platinum.
[0002]
[Prior art]
Conventionally, in the production of a seamless ring, a ring-shaped ring ingot is obtained by a method of obtaining a ring-shaped ring ingot from a punched piece punched from an appropriately thick noble metal plate. , A method of obtaining a ring ingot by casting (casting) by casting a noble metal with a mold (original mold), forming two or more single rings made of noble metal plates of different colors in a washer shape, There is a method of obtaining a ring ingot by adhering the opposite side faces of the ring next to each other by brazing.
[0003]
In the manufacturing method of seamless rings as described above, ring bullion is made by cast molding as a ring that gives various decorative designs around the ring or embeds jewelry to give a three-dimensional decoration. It is either provided or by a single-piece production where the worker uses a high degree of skill to finish manually from the material.
[0004]
[Problems to be solved by the invention]
By the way, when the ring ingot is made by casting, it is possible to realize an uneven shape design by a mold, and thus it is possible to easily make a ring having the same shape, but there is a limit to the fineness of the uneven shape.
[0005]
Therefore, when a more delicate pattern is 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 bullion is a ring formed by cast molding, and the operator uses the same precious metal forging method from the material and the ring equivalent to single item production that makes full use of the skill of the operator. However, with a ring that is all hand-finished, the quality of the ring can be felt in the same way because of the appearance of the ring, surface decoration, unique design, overall finish, etc. , The difference comes out in an invisible place such as a feeling of weight when the ring is held in the hand. In other words, if the manufacturing process for obtaining the ring bullion is different, even if the ring looks exactly the same, the ring bullion is cast and the ring that the operator finishes all by hand. Differences in quality due to the feeling of weight when it is held.
[0007]
Accordingly, the present invention aims to simplify the process of obtaining a ring ingot in a ring made of a noble metal that is manually finished by an operator by, for example, incorporating a forging method from a material, The purpose is to provide a high-quality ring with improved quality.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the method for manufacturing a seamless ring according to the present invention uses a punch having a conical processing tip portion in which a small hole is formed in the center of a thick circular plate material, and the small hole is formed from one side of the material. The punching tip is put into the punch, the punch head is beaten to perform a press working to increase the hole diameter by a small amount, and then the material is turned over and the hole diameter is increased by the same pressing process as above. By repeating the pressing process from both sides of the material, the hole diameter is finally expanded to the ring size to obtain a ring metal.
[0009]
Here, noble metals such as gold, silver, platinum, or alloys thereof are used as the thick plate-like material of the noble metal used in the present invention, and the size and thickness of the material are processed into a ring metal. It is determined empirically considering the finishing process. In addition, the material is circular, and the diameter of the hole first drilled at the center is about 2 to 5 mm.
[0010]
As described above, according to the method for manufacturing a seamless ring of the present invention, a punched cone-shaped processing tip is inserted into a small hole drilled in the center of a thick plate-like material, and the punch head is beaten to obtain a hole diameter. No need to be skilled in the processing (pressing) process to obtain the ring ingot, because the press work to expand a small amount of material is repeated from both sides of the material and the hole diameter is finally expanded to the ring size. The processing can be simplified.
[0011]
In addition, as the hole diameter expansion work (press processing) is repeated several times, the material is easily stretched in the circumferential direction around the hole and the systematic consolidation action from the hole surface side to the body radial direction is added. As the hardness gradually increases, the ring bullion increases the sense of weight and improves the “quality” of the ring bullion, compared to the cast ring bullion made of the same precious metal. A high-quality ring bullion with no damage is obtained.
[0012]
In addition, the ring ingot obtained in this way is finished into a ring by a well-known method, but the hardness of the metal structure of the ring ingot is uniformly generated over the entire circumference of the ring ingot , and the flow of the metal structure becomes circular. Since there is no variation in each part in terms of strength, it can be processed as desired without any restrictions on processing, and has excellent workability.
[0013]
In the ring ingot, the hole surface expanded to the ring size is formed into a convex surface with a round cross section and a bulge at the center by repeated pressing using a punch from both sides of the material. Exhibits a smooth surface composed of a dense metal structure, and is a preferred form as a ring. Thus, a ring ingot whose diameter has been expanded to the ring size can be processed into a required shape at a portion other than the hole surface to be finished into a ring. Thus, when finishing the ring, no special processing is required for the hole surface, and the number of finishing processes can be reduced.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0015]
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 (b) are illustrations. FIG. 4 is a cross-sectional view of the ring showing the basic shape of the completed ring.
[0016]
As shown to Fig.1 (a), the raw material 1 is made from the circular noble metal board of thickness suitably, and noble metals, such as gold | metal | money, silver, platinum, or those alloys are used. The size, thickness, and the like of the material 1 are determined empirically in consideration of the form of the final ring.
[0017]
As shown in FIG. 1B, a small hole 2 is drilled in the material 1 using a drill at the center. The hole diameter is about 2 to 5 mm.
[0018]
As shown in FIG. 2A, a punch 3 having a conical processing tip 4 is used for the small hole 2, and the processing tip 4 of the punch 3 is inserted into the small hole 2 from one side of the material 1, and the punch head Pressing is performed to strike a portion 5 and expand a small amount of the hole diameter. Next, the material 1 is turned over and the same pressing process as described above is performed, and a small amount of the hole diameter is expanded. Such pressing is repeated from both sides of the material, and as shown in FIGS. 2B and 2C, the hole diameter is gradually increased, and finally the hole diameter is increased to the ring size. To obtain a ring metal 1a. In addition, as a shape of the process tip part 4 of the punch 3 used for press work, the cone shape which curves to a small diameter side from the middle may be sufficient.
[0019]
As shown in FIGS. 3A and 3B, the ring ingot 1a thus obtained is subjected to predetermined processing on the outer peripheral surface by a well-known method, and the ring A as shown in FIG. 4 (the basic shape is shown in FIG. 4). Finish.) Here, the hole surface 2a of the ring ingot 1a expanded to the ring size is formed into a convex cross-section with rounded and centered bulges by repeated pressing using the punch 3 from both sides of the material, Since the hole surface 2a has a smooth surface and is in a preferred form as the ring A, the hole surface 2a does not require any special processing, and the ring as a whole can be used as the ring A sufficiently with the last wrapping.
[0020]
【The invention's effect】
The present invention is implemented in the form as described above. According to the present invention, a small hole opened in the center of a circular material is gradually expanded using a punch, and finally the hole diameter is reduced to the ring size. Since a ring ingot is obtained by adopting a forging method for expanding the diameter, the processing can be simplified. In addition, compared to cast rings made of the same precious metal, the ring bullion increases the sense of weight, improves the “quality” of the ring bullion, and provides high-quality rings with no quality variations. it can. In addition, since the hole whose diameter has been enlarged by repeating the pressing process is a preferable form as a ring, the number of man-hours for finishing the ring can be reduced without requiring special processing on the hole surface.
[Brief description of the drawings]
FIGS. 1A and 1B are perspective views of a material according to the present invention.
FIGS. 2A, 2B, and 2C are explanatory views showing press working on a material.
FIGS. 3A and 3B are explanatory views showing a finishing process of a ring ingot according to the present invention. FIGS.
FIG. 4 is a cross-sectional view of a ring showing the basic shape of the completed ring.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Material 2 Small hole 3 Punch 4 Conical process tip part 5 Punch head 1a Ring metal 2a Hole surface A Ring

Claims (2)

Drill a small hole in the center of a thick circular plate material, use a punch with a conical processing tip, put the punch processing tip into the small hole from one side of the material, beat the punch head, The hole diameter is finally changed to the ring size by performing press processing to expand the diameter by a small amount, then turning the material upside down and repeating the press processing to increase the small diameter of the hole diameter from both sides by the same press processing as above. A method for producing a seamless ring, characterized in that the ring is bulged to obtain a ring ingot.   2. The method of manufacturing a seamless ring according to claim 1, wherein a ring ingot having a hole diameter expanded to a ring size is processed into a required shape by processing a portion other than the hole surface into a required shape.

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