JPS62104629A - Production of rotary bezel for portable wrist watch - Google Patents

Abstract

PURPOSE:To remarkably reduce the cutting stage of the product having beautiful external appearance by performing the press forming of the cylindrical blank which fits the prescribed face by the mirror face metal die that the designated part of a rotary bezel is subjected to a hobbing in the prescribed shape and dimension. CONSTITUTION:The outer peripheral knurling groove 1, bottom face clicking groove 2, force opener 3, the upper face shape 4, the outer peripheral shape, chamfer face 6, chamfer diameter 7, parting diameter 8 and the outer shell diameter 9 of recess of the rotary bezel of a portable wrist watch are subjected to hobbing in the prescribed dimensional shape. The hardness is made Hv550-650 with the heat treatment of the punch 10 having R at the corner part 13, 14, 15, 16 and a die 11, and the die 11 is subjected to a mirror finishing. The cylindrical blank cut from the pipe stock that the outer diameter shape is 1-1.0mm smaller in the diameter than the outer diameter shape of the die 11 and the inner diameter shape is 0.5-1.0mm smaller than the shape of the punch 10 is inputted into metal dies 10, 11 and subjected to a press forming. Thereafter with the cutting and finishing of the necessary part the man-hour in cutting of the rotary bezel in the prescribed shape having beautiful external appearance is remarkably reduced and the delivery and cost can be reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a portable wristwatch.
/Relating to manufacturing method.

Existing necessity [of the invention]

The present invention is a method for manufacturing a rotating bezel to be attached to the front side of a portable wristwatch, in which the bunches and dies of a press mold are bobbed, and the dies are mirror-finished.

A cylindrical blank was used as the blank, and a rotary cell of a portable wristwatch was molded by press mold I].

[Conventional technology]

In the conventional rotating bezel W+'M method, a ring strip blank is carved out by cutting as shown in FIGS. 2, 2, 3, 4, and 5.

[Problems and objectives to be solved by the present invention] In the case of the conventional technology, the load of cutting is enormous, especially the outer circumferential roller l-ig 1 and the bottom click groove 2, which takes 60 to 120 minutes!
Because of +1 cutting, tool life was extremely short and productivity was extremely low. Furthermore, because of the poor roughness of the interrupted cutting surface, it took a considerable amount of time to finish the appearance. Furthermore, press molding requires a large number of stampings, making it unprofitable.

To solve this problem, the molding load must be increased, and the mold cannot withstand it. Therefore, it was impossible to put press molding to practical use. Therefore, the present invention is intended to solve these problems, and its purpose is to solve the 3I2 problem.
1. 4, 5, 5, and 6, the rotating bezel has an outer knurled groove, a bottom groove, a cutout, and a top surface shape.
Outer circumference shape, biting surface, biting diameter.

The goal is to complete the parting diameter and outer body gap diameter by machining only one to several times.

[Means for solving problems]

The method for manufacturing a rotating bezel for a portable wristwatch according to the present invention includes a knurled groove on the outer periphery, a clink groove on the bottom surface, and a knurled groove on the bottom surface.

Top shape, outer circumference shape, biting surface, biting diameter, parting diameter.

It is characterized in that the diameter of the outer shell is press molded using a hobbing mold with a mold structure shown in FIG. 1, and a cylindrical blank with a 0.5 to 3.3 mm zero surface.

[Effect]

By matching the raw material volume of the cylindrical blank and the finished volume of the rotating bezel, the concentrated load on the mold is reduced, and because the punch and die are hobbed, the metal fibers in the hobbing mold are not cut, resulting in a long mold life. Taking advantage of this fact, we have made press molding possible. (FIG. 7) [Example] An example of the present invention will be described below based on the drawings. Third
1 of the rotating bezel shown in Fig. 4 and Fig. 5, outer circumferential row L
Cytosulcus, 2. Bottom click groove, 3. Kojiake, 4. Top surface shape, 54 outer peripheral shape, 6. Biting surface, 7. Biting diameter, 8.
Cutting diameter, 9. The outside diameter of the outer body is formed by press molding using a punch 10 and a die 11 having the structure shown in FIG. is formed by hobbing, and the die 11 used has a mirror finish. The outer diameter shape of the cylindrical blank is 0.0 mm in diameter from the Goui outer diameter shape. 1-1. Oxs small cylindrical blank inner diameter shape is cut from a pipe material 0.5 to 1 Qmm smaller than the punch shape, or the inner and outer diameters are press-cut, and die-formed with a load of 50 to 90 tons. do. Then 1. outer periphery knurling groove, 4. Top shape.

5. A mirror surface is transferred to the outer peripheral shape 8. Furthermore, as a measure to improve the mold life, the IO punch shown in Figure 1 is hobbed and the 13th, 14th, and 15th parts are marked R and the heat treatment hardness is H.
v550-650. 11 dies are hobbing molded 1
Mark R on part 6. Add an angle β of 10 to 40 degrees on the top surface of part 17 of the knockout large diameter. What has made press working more useful is that the mold manufacturing method is hobbing instead of the conventional electric discharge machining, which reduces the number of mold makers, and the clean surface of the hobbing mold eliminates the need for polishing complex shapes, reducing mold polishing costs. This is because it could be made cheaper.

〔Effect of the invention〕

As explained above, the present invention utilizes a press method for manufacturing a rotating bezel for a portable wristwatch, thereby reducing the cutting load by more than 80% compared to the conventional method for manufacturing a cutting pressure body. Appearance quality (surface roughness) was also significantly improved by using a press, and polishing costs were significantly reduced. Additionally, due to the difference in work efficiency between pressing and cutting, we were able to shorten the delivery time by one-third, which had a significant effect.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the mold structure of the present invention. 10...Punch,
+1...Glue, 12...Knockout 22...Bottom click groove, 3...Kishidoke part, 1...Outer periphery knurling groove, 5...Outer periphery shape Figure 2 shows conventional cutting process In the processed cross-sectional view (al~+
C+ is a sectional view showing the process steps. Figure 3 is a plan view of the rotating bezel. Figure 4 is a side view of the rotating bezel. Figure 5 is a sectional view of the rotating bezel. Figure 6 is a sectional view of the press ascent. Figure 7 (a). Hobbing mold fiber flow diagram Above

Claims (1)

[Claims] In the rotating bezel of a portable wristwatch, the outer knurling groove, the bottom click groove, the knurled groove, the top surface shape, the outer circumferential shape, the biting surface, the biting diameter, the parting diameter, the outer body gap diameter, the hobbing mold and the surface. A method for manufacturing a rotating bezel for a portable wristwatch, characterized by performing press molding using an attached cylindrical blank.