JPS63118684A - Production of dial for wrist watch - Google Patents

Abstract

PURPOSE:To obtain a method which not only has the rationality of working but also is suitable for production of various kinds and small quantity of dial, by working a short-sized material on which five or more dials are arranged in series in one row. CONSTITUTION:In the process layout, pilot halls as working references of following processes are made in raw materials in the hoop state. Raw materials are cut to a fixed short size corresponding to ten dials. The press process is divided into center hole piercing, window piercing, and outside shape cutting. In this outside shape cutting, numerical control (NC) is performed with 'Diacompax(R)', and software is switched to immediately switch NC to working for the next dial type. In the next supporting leg adding process, NC is used and a bar- shaped supply material is cut to a prescribed length after welded. In the next surfacing process, the surface is ground with a silicone rubber roll by creep feed and up-cut while avoiding supporting legs. In the painting process, the short-sized material is delivered while having an unbinding material sucked by suction pads and in the printing process, a short-sized material feeding function is given to automatize the process. Positioning for final tie-bar cutting is performed by NC.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for manufacturing a wristwatch dial.

[Conventional technology]

Conventional methods for manufacturing watch dials include cutting out raw material hoops into individual discs using a press and then proceeding with post-processing, or proceeding with processing using the raw material hoops as they are, and punching them out into discs at the end of the processing process. One of the processing methods was to drop it and complete it.

[Problem that the invention seeks to solve]

However, with the above-mentioned conventional technology, in the case of a single disk processing method, the processing is not rational, and in the case of a raw material hoop processing method, it is not suitable for high-mix, low-volume production that can accommodate the diversity of watch designs. There is a problem.

Therefore, the present invention is intended to solve these problems, and its purpose is to manufacture dials that are both rational in processing and suitable for high-mix, low-volume production. It's about providing a method.

[Means for solving problems]

The method for manufacturing a wristwatch dial according to the present invention is characterized in that short dials are formed by arranging five or more dial plates in a series.

[For production]

According to the above-mentioned configuration of the present invention, in the case of the conventional processing method for a single disc, production on an automated line can be carried out without problems in terms of direction determination and alignment of the material being supplied to and removed from the processing machine. In many cases, defects in supply and removal of materials cause a decrease in yield and a decrease in machine operating time, and on the contrary, there is no point in automating and rationalizing the process.

In addition, when processing conventional raw material hoops as they are, the dials are produced in small quantities with a wide variety, so model changes are frequent, resulting in machine stops each time, defects in the workpiece at the changeover, and the need for automatic processing in each process. Must match the machine's tough line tact.

From the above point, by shortening the processing form of the dial, it is possible to achieve a streamlined line suitable for stable supply and removal of materials and for high-mix, low-volume production. It should be noted that if the number of sheets arranged in series in a short length is 5 or less, the effect will be small, and a larger number will be more effective, but from the viewpoint of the machine configuration and the uneven distribution of the line, it is preferably 20 or less.

〔Example〕

FIG. 1 is a process layout of the most basic parallel support model (a model completed only by painting and printing) of a wristwatch dial according to an embodiment of the present invention.

FIG. 2 shows a conventional process layout for a single disk. Further, FIG. 3 is a diagram showing the state before the tie bar is cut in the embodiment of the present invention.

As for the process layout, first, while the raw material is in the 7-p state, a pilot hole is removed, which will serve as a reference for all processing in the subsequent steps. Next, 10 pieces of the dial were cut into short lengths. The pressing process was divided into nine parts, which were conventionally performed in a single unit using a total punching die, into center hole punching, breather cutting, and outline cutting. this is,
It was divided to reduce mold costs and to avoid switching molds each time a model is changed as much as possible. Furthermore, in contour cutting,
I changed the number using Diamond Compax and switched to the next model immediately using software switching.

The next process for the support part was to achieve No. 1, but since the material supplied is unstable when it comes to small parts such as the support part, the material was supplied in the form of a rod, and after welding, it was cut to the specified length. did.

The purpose of the surface leveling process is to remove the protrusions on the surface produced by the supporting feet, but since the supporting feet position changes depending on the model and there are many types, the surface is creep-fed while the supporting feet are released using silicone rubber rollers. , it was decided to use amp cut for grinding, making it unnecessary to switch between different models.

In the painting process, the short material is fed and removed using a suction band, and the material is passed over.In the case of a dial, it is strictly prohibited for the paint to get around to the real part during painting, so the work is applied to the peak of the needle. By placing the material on top and spraying it on, we were able to remove the foot part. Additionally, the paint color can be changed instantly using an automatic color changer.

The printing process was automated by adding the function of feeding short materials to the existing semi-automatic machine.

The final tie bar cutting involved separating the dial body part from the short part, but we decided to use No. 1 for positioning.

As mentioned above, by making the direction determination and alignment supply/removal material short-length processing, automation can be achieved extremely easily, and the dial preparation cost can be significantly reduced. In addition, due to high-mix, low-volume production, it has become possible to make quick changes when changing the model of each processing machine, increasing productivity and shortening machining lead time.

〔Effect of the invention〕

As mentioned above, according to the present invention, by shortening the processing form of the dial plate, it is possible to distinguish the direction, facilitate the alignment and supply/removal of materials, and speed up model changeover, thereby increasing productivity. ,
This has the effect of shortening the processing lead time and reducing the dial manufacturing cost. In addition, when connecting to an automated watch assembly line, it is possible to supply punched materials before the tie bars are cut, as shown in Figure 3, making dial material supply on assembly lines stable and fast, which was previously unstable and rare. It has the effect of being able to

[Brief explanation of the drawing]

1 Figure 2 Cost of preparing a short dial according to the present invention @Figure 2: Diagram of dial manufacturing process for a single disc using conventional technology Figure 3: Diagram of the completed product according to the present invention before cutting the tie bar that's all Applicant: Seiko Epson Corporation Agent: Patent Attorney Mogami and 1 other person Figure 1 Figure 2

Claims (1)

[Claims] A method for manufacturing a wrist watch dial, characterized in that the dial plate for a wristwatch is processed into short lengths made by arranging five or more dial plates in a series.