JPH04344844A - Method for hot-forging accessories - Google Patents

Abstract

PURPOSE:To manufacture accessories having smooth surface with a hot forging. CONSTITUTION:Plating 2 is applied to the surface of a raw material 1 cut to the prescribed size and the raw material applied with relevant plating is heated to form the accessories with the hot forging. Thereafter, a finish work is executed. The finish work to surface can be executed for a short time without missing the original shape of accessories obtd. with the hot forging.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing accessories such as watch parts, glasses, brooches, necklaces, etc. by hot forging.

0002

[Prior Art] In the conventional hot forging method for jewelry, a material processed into a certain shape, such as a cylinder, a square pillar, or an irregularly shaped pillar, is heated to a predetermined temperature by induction heating, etc., and then the material is heated with tweezers. It is set in a mold attached to a press machine and press-molded. After that, finishing work is performed to complete the accessory.

0003

[Problem to be solved by the invention] However, since these materials are exposed to high temperatures during heating and immediately before forging,
The surface undergoes a violent reaction with oxygen in the atmosphere and a large amount of oxide is deposited on the surface. If this is forged as is, it will become a forged product made of raw materials and oxides. These oxides are not evenly distributed on the surface of the forged product, so if the oxides are removed by pickling or the like, the surface of the forged product becomes rough. In order to make this a smooth surface, it must be removed by cutting or grinding. Furthermore, if these removal processes are performed, the shape of the forged product will be distorted.

An object of the present invention is to solve the above problems and provide a means for obtaining jewelry with a smooth surface by hot forging.

[0005]

[Means for Solving the Problems] The structure of the present invention is a method for manufacturing accessories by hot forging, in which the surface of a material processed to a predetermined size is plated, the plated material is heated, Accessories are formed by hot forging and then finished.

[0006]

Embodiments Hereinafter, embodiments of the present invention will be described in detail in the order of processing steps based on the drawings. 1 to 9 show the processing steps for a watch case, which is an accessory.

1. Material 1 is obtained by cutting a brass rod to a certain length. [See Figure 1]

2. A chromium plating 2 of 1 μm to 2 μm is applied to the material 1 by wet plating. [See Figure 2]

0009
]3. Material 1 with chrome plating 2 on the surface is placed on heating table 4
and heated by induction heating coil 3 until it reaches 750°C. [See Figure 3]

4. Next, using tweezers, the heated material 1 is set in a mold (lower) 6 attached to a press machine. In addition, 5 is a mold (top) and 7 is a knockout. [See Figure 4]

5. Start the press immediately and press the mold (top)
5. Shape the material 1 using the mold (lower) 6 and knockout 7 to obtain a forged product 8. [See Figure 5]

6. The forged product 8 is taken out from the mold and cooled. The plated portion is attached to the surface of the forged product 8 in the form of a piece of foil. [See Figure 6]

7. Next, unnecessary parts (such as flash) of the forged product 8 are removed to obtain a pressed finished product 9. [See Figure 7]

8. Next, the parts of the press finished product 9 that could not be formed by forging are cut to obtain the watch case 10. [See Figure 8]

9. Next, the surface of the watch case 10 is polished. Here, the plated foil pieces remaining on the surface are easily removed.

10. Next, finish plating 11 is applied to the surface of the watch case 10, and the watch case 10, which is an accessory, is completed. [See Figure 9]

In the above embodiments, the material was plated by a wet plating method, and the type of plating was chrome plating.
Nickel plating, copper plating, gold plating, palladium plating, rhodium plating, ruthenium plating, etc., or alloy plating of these may be used. Further, although the treated object was a watch case, which is an accessory, it goes without saying that the process can be applied to other accessories such as watch parts, glasses, brooches, necklaces, etc.

[0018]

[Effects of the Invention] As is clear from the above explanation, the jewelry obtained by the present invention can have a smooth surface by hot forging. The number of quality corrections can be greatly reduced. Furthermore, by reducing the number of these corrections, it is possible to prevent the accessory from losing its original shape.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a material in an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view of a plated material according to an embodiment of the present invention.

FIG. 3 is a sectional view showing a state in which a material is being heated in an embodiment of the present invention.

FIG. 4 is a sectional view showing a state in which a material is set in a mold in an embodiment of the present invention.

FIG. 5 is a sectional view showing a state in which a material is stamped in an embodiment of the present invention.

FIG. 6 is a sectional view of a forged product according to an embodiment of the present invention.

FIG. 7 is a sectional view of a finished press product according to an embodiment of the present invention.

FIG. 8 is a sectional view of a watch case according to an embodiment of the present invention.

FIG. 9 is a sectional view of a watch case plated according to an embodiment of the present invention.

[Explanation of symbols]

1 Material 2 Chrome plating 3 Induction heating coil 4 Heating stand 5 Mold (top) 6 Mold (bottom) 7 Knockout 8 Forged products 9　Press finished product 10 Watch case 11 Finish plating

Claims (1)

[Claims] Claim 1. A method for manufacturing accessories by hot forging, which includes plating the surface of a material processed to a predetermined size, heating the plated material, and forming the accessory by hot forging. A method for hot forging accessories, characterized in that finishing processing is performed thereafter.