JPS5947948B2 - Manufacturing method of yoke for clock pulse motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a yoke for a motor for a quartz watch.

[Background of the invention]

The demand for reducing the cost of watch parts is gradually becoming stronger, and it has become necessary to develop a prayer method to cope with this demand.

Motors used in crystal watches are no exception.
There is a strong desire to develop new processing methods that reduce costs.

[Prior art and its problems]

FIG. 1 is a process diagram for explaining a conventional yoke processing method.

FIG. 1A is a plan view of the yoke body 1 after being molded, and FIG. 1A is a plan view of the splint plate 2 after being molded.

Conventionally, as shown in Fig. 1a and b, a yoke body 1 and a splicing plate 2 were used.
The yoke body 1 and splicing plate 2, which are separate from each other, are separately pressed and then integrated by welding or the like as shown in FIG. 1C.

Thereafter, as shown in FIG. 1d, the rotor hole and the shaft are finished by shaving, and as shown in FIG. was.

However, since this processing method involves single-piece processing, each part must be fed by hand, or even if it is fed by a robot, it has to be transported and aligned using a parts feeder, etc. This method has major drawbacks, such as the need for additional work, which greatly increases the number of processing steps, resulting in a significant increase in costs.

[Purpose of the invention]

The object of the present invention is to provide a processing method that eliminates these drawbacks and obtains a low-cost yoke by reducing the number of man-hours.

[Structure of the invention]

The structure of the present invention to achieve the above object is to form a splint or a yoke body into a plate material to use as a carrier for continuous processing, perform various post-processing on the plate material, and finally make it into a single piece.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

FIGS. 2g to 2g are process diagrams showing the processing steps of the present invention.

In FIG. 2, a plate material used as a carrier for continuous processing is shown as a strip material, and a material for splicing plate is used as the strip material.

Figure 2g shows the process of removing the plate.

As shown in the figure, a strip material 4a made of a non-magnetic metal material
Then, a pilot hole 4f, which will be a positioning part in the subsequent process, is made, and the outer shape 4b of the splice plate 4 and the hole 4C are pressed out, leaving a bridge 4d, which will be a connecting part between the strip 4a and the splice plate 4. .

Figure 2 shows the punching process, in which a protrusion 4e is used to perform projection welding with the purpose of simultaneously welding multiple points in the splice 4 formed in the strip 4a using a protrusion punch 6. conduct.

Normally, this step is carried out using a mold, so that multiple points can be molded at the same time, and protrusions of approximately the same height can be obtained.

FIG. 2C is a diagram showing a yoke body 5 made of a magnetic material that is completely stamped in a separate process.

FIG. 2d shows a welding process in which the yoke body 5 is automatically fed onto the splint 4 of the strip material 4a as shown in the figure.
The yoke body 5 and the splicing plate 4 are separated by passing a current between them.
The protrusions 4e are simultaneously welded at multiple points.

Fig. 2e shows the post-finishing process, as shown in the figure, the strip material 4a
With the yoke body 5 welded onto the splicing plate 4, the rotor housing hole 5a of the yoke body 5 and, if necessary, a positioning hole, etc., are finished by shaving with a shaving arrow 7.

In this way, by performing finishing punching after welding, it is possible to obtain accurate hole diameters and hole position relationships, but if the yoke body 5 is completed during the general punching process in step C described above, the post-finishing process can be completed. What to omit: Yes.

Next, FIG. 2F shows a slitting process, in which a slit 5b is formed in the stepped portion of the rotor accommodation hole 5a of the yoke body 5 using a slitching cutter 8, and only the yoke body 5 is separated into left and right parts.

At this time, since the yoke body 5 and the splicing plate 4 are fixed by welding, the relationship between the large weeping device will not be disturbed.

The main steps of the yoke are completed through the steps described above, and these main steps are carried out in an integrated structure using the strip material 4a as a carrier.

Figure 2g shows the cutting process, and by cutting the bridge 4d between the strip material 4a and the splice plate 4n in the pressing process, the completed yoke with the splice plate is individually separated from the strip material 4a. Processing using the material as a carrier is completed.

Finally, the completed yoke is placed in a magnetic annealing furnace and the magnetic material is magnetically annealed in the same way as in the case of single-piece processing, thereby completing the yoke as the stator of the pulse motor.

Next, the features of this process are listed. The first is the biggest feature of the present invention, which is that the welding process and post-process (shaving finish, cutting, or slitting) process can be performed continuously on the strip material. As a result, the main machining process of the yoke can be fully automated, and since machining can be carried out continuously within one machining line, extra processes such as transporting parts can be omitted, greatly reducing the number of man-hours. We were able to achieve great results in reducing costs.

The second method is to form a splice on a thin strip of non-magnetic material, which is thin enough to be easily processed by punching, etc., and also allows projection welding for projection welding to be done easily and accurately. It can be produced in large quantities in one process.

In other words, the amount of protrusion of the projection weld is determined by the ratio of the projection weld to the plate thickness.

Consideration is also given to the difference in material costs between the yoke body and the splint.

In other words, expensive permalloy material is used as the magnetic material for the yoke of a step motor, but 5VS304 is used as the splice plate because it is non-magnetic and has heat resistance that can withstand magnetic annealing temperatures. It is inexpensive because of the

Therefore, for processing reasons, the effective area relative to the area of the raw material (the area of the part that will eventually be used as a finished part)
Adopting an inexpensive material for the splicing plate for the strip material, which inevitably has a small ratio of , is very advantageous in terms of cost reduction.

Thirdly, we adopted projection welding for welding.

The reason for this is that although the protrusion forming step is one more step, it can be processed using a mold, a plurality of protrusions can be processed at the same time, and multi-point simultaneous welding is possible.

In other words, in the past, two to four welding points were processed one by one, which required a lot of man-hours, but by adopting projection welding, it is now possible to weld multiple points simultaneously, and therefore it can be incorporated into automation. This made it easy to reduce man-hours.

In terms of equipment, we were able to reduce the number of welding machines we own by using multi-point simultaneous welding.

By the way, in the embodiment shown in Fig. 2, the splint was made into a band material for the reason stated in the second feature, but of course, even if the permalloy material of the yoke body was made into a band material, it would not be possible to make the splint into a band material. Even if this is not the case, it is quite possible to obtain a cost reduction effect by streamlining processing due to the first and third reasons.

Next, other embodiments of the present invention will be described.

FIG. 3 is a plan view showing how the splint is formed into a wide plate material so that double-row splints can be processed.

Form the splint on the board as shown in the figure, and place the second plate within a certain area of the board.
Processes a to g in the figure may be performed and repeated, or items in the same row may be processed in such a way that the same process is performed.

In FIG. 3, 9 is a splint, which is connected to a plate 9b by a bridge 9a, which is a connecting part.
The yoke body 10 may be automatically supplied after the process of protruding the protrusion 9a is carried out, and the yoke body 10 may be cut after being subjected to welding and slitting processes, and the subsequent process may be continued.

The concept for the plate material is the same as that for the band material, and there is no difference even if the plate material is used as a permalloy material for the yoke body, and the effect is exactly the same.

〔Effect of the invention〕

As described above, punching is performed on the spliced plate material, and the punched plate material is used as a conveyance material to supply the yoke body onto the spliced plate, and the punching process such as welding, shaving finishing, cutting, etc. Alternatively, by adopting a series of composite processing technologies that perform slitting processing and finally separate the plate material, it is possible to fully automate the main composite process, resulting in a significant reduction in man-hours and costs. This made it possible to achieve a significant effect in reducing the cost of the yoke of the step motor for watches.

Note that the manufacturing method of the present invention can achieve a particularly great effect by processing a low-cost splint onto a plate material; however, even if the yoke body is punched onto a plate material, the material cost will increase somewhat; Since a large effect can be achieved in terms of man-hours, the cost reduction effect of the present application is significant.

[Brief explanation of the drawing]

Figures 1 a-e are process diagrams showing the processing steps for a conventional yoke with a splint, and Figures 2 a''-g are process diagrams showing the process for manufacturing a yoke with a splint using a strip material according to an embodiment of the present invention. , FIG. 3 is a process diagram of the processing process of a yoke with a spliced plate made of a wide plate material showing another embodiment of the present invention. 1.5.10...Hata Ribo, 2.4. 9...Song plate, 4a...Strip material, 4d, 9a...Curved bridge, 4e, 9c...Protrusion, 5b...Curved slit,
8...Interval slitting cutter, 9b...Plate material.

Claims (1)

[Scope of Claims] 1. A method for manufacturing a yoke for a clock pulse motor in which a yoke body is integrated with a splice plate, including the step of punching out the external shape of the splice plate into the plate material while at least a portion thereof is connected to the plate material. a step of molding a yoke body, a step of placing the yoke body on the splint formed on the plate material, and a step of fixing the yoke body to the splint plate by welding or the like using the plate material as a conveying material. a step of forming slits at predetermined locations of the yoke body using the plate material as a conveyance material while the yoke body and the splint are fixed together; A method of manufacturing a yoke for a pulse motor for a timepiece, comprising the step of separating the yoke from the plate material by cutting the connection portion with the plate material. 2. A method for manufacturing a yoke for a clock pulse motor in which a yoke body is integrated with a splicing plate, which includes the steps of punching the external shape of the yoke body into the plate material while at least partially connected to the plate material, and molding the splice plate. a step of processing, a step of placing the splint on the yoke body formed on the plate material, and a step of fixing and integrating the splice plate to the yoke body by welding or the like using the plate material as a conveyance material. a step of forming a slit at a predetermined location of the yoke body using the plate material as a conveying material while the yoke body and the splint are fixed together; and a step of connecting the yoke body with the plate material using the plate material as a conveying material. A method for manufacturing a yoke for a pulse motor for a watch, comprising the step of separating the plate material from the joke by cutting the yoke.