JPH04344849A - Manufacture of ornamental parts for portable watch - Google Patents

Abstract

PURPOSE:To reduce number of working processes, to realize disappearance of joint parts, to reduce drastically the cost and to improve attractive outward appearance and freedom degree of molding by enabling integral manufacture of the parts. CONSTITUTION:In the manufacturing method of an ornamental parts for portable watch constituted of B parts having space in the center part and A parts capable of moving freely in a space, at the time of working by using lost wax casting method, at first, after manufacturing the A parts, this outer peripheral part is enclosed with embedding material, and after enclosing this outer peripheral part with water soluble wax pattern, non-water soluble wax pattern is formed on the outer peripheral part and the water soluble wax is removed and casting is executed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing exterior parts for a portable watch.

0002

2. Description of the Related Art Conventional techniques are shown in FIGS. 3 and 4. In the conventional processing method, first, C part 11, D part 12, and E part 13 are manufactured separately, and then C part 11 is placed inside and D part 12 and E part 13 are placed at the positions of their respective end faces 15 and 16. After that, a linear or powdered brazing material is set between the D part 12 and the E part 13 on the end faces 15 and 16, and heated to melt the brazing material into a capillary state. By using this phenomenon, the D part 12 and the E part 13 were integrated, and the C part 11 was wrapped inside so that it could move freely. FIG. 4 shows the completed state.

0003

[Problems to be Solved by the Invention] However, when using the prior art as described above, there are problems as shown below.

[0004] Because separately manufactured parts are joined together, (1) Two or more parts are manufactured separately and then integrated by brazing, etc., which increases the number of processing steps and reduces man-hours. This increase will result in higher costs. (2) At the joining surfaces, differences in dimensions occur between parts during processing, misalignment during setting, etc., resulting in differences in level between the parts, which impairs the appearance. (3) Since joining by brazing uses capillary action to fill the gaps between the parts, the solder may break partially due to variations in the gaps between parts, resulting in holes and other unsightly appearance. Lose. (4) Correcting them requires manual correction, which requires a lot of man-hours and increases costs. (5) Since two or more parts are joined together, complex-shaped models are difficult to process, and there are limitations from a modeling standpoint. There are issues such as: The present invention is intended to solve these problems, and its purpose is to reduce the number of processing steps, eliminate joints, and significantly reduce costs by making it possible to manufacture the product in one piece. It offers improved appearance, improved appearance, and greater freedom in shaping.

[0005]

[Means for Solving the Problems] The method for manufacturing an exterior part for a portable watch according to the present invention includes a B part having a space in the center and a B part having a space in the center.
In a method for manufacturing an exterior part for a mobile watch, which is comprised of part A, which is located within the space of the part and can move freely in the space, when processing using the lost wax casting method, part A is made of a metal material. The investment material is manufactured in advance by forging, casting, cutting, powder molding, etc., and after applying the investment material to the entire outer periphery of Part A, water-soluble wax is applied to the outer periphery of Part A in the same shape as the space. A wax pattern is molded using water-insoluble wax, and a wax pattern is molded on the outer periphery of the almost water-soluble wax pattern in the same shape as the external shape of part B. After removing the water-soluble wax pattern in water, It is characterized by mold making and casting.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings.

FIG. 1 shows the steps of the present invention. Part A that will fit into the inner space is manufactured from metal. Manufacturing methods include forging, casting, cutting, powder molding, etc. At this time, the material used for part A is B.
A material with a melting point equal to or higher than that of the parts is used, and as a guideline, a material with a melting point of 850° C. or higher is used. Regarding the surface condition of part A, the material may be used as is, or surface treatment may be applied to prevent oxidation. Examples of surface treatments include gold plating, platinum plating, palladium plating, and rhodium plating. Thereafter, a mold material used for lost wax casting is applied to the entire outer circumference of Part A to a thickness of 1 mm or more. After the investment material solidifies, it goes on to the next process. Separately B
A master for the core is made of copper alloy, with the same outer shape as the inner shape of the space of the part, but larger by the amount of shrinkage. Using this core master, a rubber mold is made from silicone rubber. Set part A, which is coated with investment material, in a cavity similar to the roughly rubber-shaped core master. At this time, it is best to set part A on the opposite side of the sprue as much as possible. Thereafter, a water-soluble wax pattern is formed from the water-soluble wax melted at 60 to 65° C. under a pressure of 0.5 kg/cm 2 to 1.2 kg/cm 2 . At this time, water-soluble wax for the core is formed so as to wrap around part A. Separately, a master is made from copper alloy, which has the same external shape as Part B, but has a groove in which a water-soluble wax pattern for the core can be set, and is enlarged by the amount of shrinkage, and a rubber mold is made from silicone rubber. Set a water-soluble wax pattern for the core in the groove of the cavity with a similar shape to the outer shape of the roughly rubber-shaped part B.
0.5 kg/water-insoluble wax melted at ~75°C
A water-insoluble wax pattern for part B is taken at a pressure of cm2 to 1.2 kg/cm2. After that, the wax pattern, which is an integrated part A, the water-soluble wax pattern for the core, and the water-insoluble wax pattern for the B part, is placed in water for 60 to 90 minutes.
It is left immersed for 0 minutes. At this time, a part of the water-soluble wax pattern for the core is set to be exposed on the surface of the water-insoluble wax pattern for the B part. By soaking in water for 60 to 90 minutes, the water-soluble wax for the core melts, creating a space between the water-insoluble wax pattern of part B and part A coated with investment material, and the wax pattern is assembled into a tree shape. , then manufacture the mold. At this time, holes are provided on the surface of the wax pattern for the B part so that the A part can be visually recognized. The investment material flows through this hole and fills the space between parts B and A. After firing, the mold is cast into a predetermined metal using the lost wax method. After that, the mold is broken down, the product is removed, and the product is made into a product through a polishing process. Figure 2 shows the completed product.

[0008]

As described above, according to the present invention, there is provided an exterior part for a portable watch, which is composed of part B having a space in the center and part A which can move freely in the central space of part B. In the manufacturing process, part A is inserted into the wax pattern for part B, and then part B is cast, thereby reducing the number of steps. Also, by eliminating joints, the cost is significantly reduced, the appearance is improved, and This has effects such as making it possible to realize designs with complex shapes.

[Brief explanation of the drawing]

FIG. 1 is a process diagram of the present invention.

FIG. 2 is a side sectional view of an embodiment of the invention.

FIG. 3 is a side sectional view of the prior art before brazing.

FIG. 4 is a side sectional view of a completed product according to the prior art.

[Explanation of symbols]

1　A parts 2 B parts 3 Space part 4 Hole 11 C parts 12 D parts 13 E parts 14 Space part 15 End face 16 End face 18 hole 11´　C parts 12´　D parts 13´ E parts 14´　Space part 17 Brazing surface 18 hole

Claims (1)

[Claims] Claim 1: A method for manufacturing an exterior part for a portable watch, which comprises a part B having a space in the center, and a part A, which is located approximately within the space of the B part and can move freely in the space. When processing using wax casting method, A
The parts are manufactured in advance from metal materials by forging, casting, cutting, powder molding, etc., and after applying the investment material to the entire outer periphery of Part A, the outer periphery of Part A is made to have the same shape as the space. A wax pattern is cast on the shape using water-soluble wax, a wax pattern is cast on the outer periphery of the water-soluble wax pattern using water-insoluble wax in the same shape as the external shape of part B, and the water-soluble wax pattern is cast under water. A method for manufacturing an exterior part for a portable watch, characterized in that the exterior parts for a mobile watch are removed in a mold, and then molded and cast.