JPH0156152B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing bellows used, for example, in sensors.

[Prior Art] Generally, when a bellows is used as a sensor for various devices, it is usually formed into a thin capped shape with a spring constant of about 10 to 20 g/mm and a film thickness of about 15 to 20 μm. If such a covered bellows thin film is manufactured using, for example, nickel plating,
Since the film thickness of the lid portion is too thin, the lid portion is often destroyed by the contact load of the contact that contacts the lid portion from the inside or outside of the bellows, making it unusable.

Therefore, conventionally, in manufacturing the above-mentioned covered bellows, an open bellows thin film body 1 is formed in advance as shown in FIG. It is obtained by covering the reinforcing plate 2 made of stainless steel plate or cap as shown, and soldering them together as shown in FIG. 11.

[Problems to be Solved by the Invention] However, in the method of manufacturing bellows using the above-described conventional method, the reinforcing plate 2 is placed over the opening at one end of the open bellows thin film body 1 and soldered to each other. Because of this, there are many man-hours for cleaning before and after soldering, soldering work, etc., which are complicated and prone to mistakes, and the positioning accuracy of the reinforcing plate is low, resulting in a high quality defect rate. It was hot.

[Object of the Invention] The present invention was made under the above circumstances, and its purpose is to significantly reduce the number of work steps and to improve the positional accuracy of the reinforcing plate to reduce the quality defect rate. It is an object of the present invention to provide a method for manufacturing a bellows that can reduce the temperature of the bellows.

[Means for Solving the Problems] In order to solve the above problems, the present invention includes the following:
A method for manufacturing bellows, which uses a meltable core whose outer periphery has a bellows inner diameter shape, performs plating on the outer periphery of the core to form a covered bellows thin film body, and then melts and removes the core. hand,
A reinforcing plate is held and arranged in advance on the end face corresponding to the covered side of the core before the plating process, and this reinforcing plate is fixed and integrated at the same time as the covered bellows thin film body is formed by the plating process. This is what I did.

[Function] That is, in the present invention, by having the above structure, a reinforcing plate is held in advance on the end surface corresponding to the covered side of the core, and this reinforcing plate is formed by plating to form a covered bellows thin film body. Since the core is melted and removed after being fixed and integrated at the same time, the reinforcing plate can be fixed and integrated at the same time as the covered bellows thin film body is formed by plating. This eliminates the need for man-hours such as cleaning and soldering, which can significantly reduce the number of man-hours and improve the positioning accuracy of the reinforcing plate, reducing the rate of quality defects. Become.

[Example] The present invention will be described below with reference to an example shown in FIGS. 1 to 8.

1 to 4 show a first embodiment of the method for manufacturing a bellows according to the present invention, and as shown in FIG. 1, numeral 10 in the figure is a covered bellows manufactured by the manufacturing process described later. The bellows 10 is made of a thin metal film 11 made of, for example, nickel, and a flat reinforcing plate 12 made of a stainless steel plate is integrally fixed to a lid portion 11a of the bellows 10.

That is, in order to manufacture the above-mentioned bellows 10, as shown in FIG. A recess 21 is formed on the end face 20a side, and a flat stainless steel plate 22 serving as a reinforcing plate is press-fitted and held in the recess 21, as shown in FIGS. 3 and 4. Thereafter, the outer periphery of the core 20 is nickel-plated to form a covered bellows thin film body 23, and at the same time as the covered bellows thin film body 23 is formed, the plate 22 is fixed and integrated. After the molding, the core 20 is immersed in a caustic soda solution bath (not shown) to be dissolved and removed, and then washed to obtain a bellows molded product as shown in FIG. In this case, the outer peripheral edge of the plate 22 has a notch 22 as shown in FIG.
As shown in FIG. 4, a part 23a of the plating layer of the covered bellows thin film body 23 bites into this notch portion 22a during plating processing, thereby making it possible to increase the joint strength.

Furthermore, FIGS. 5 to 8 show a second embodiment according to the present invention, and as shown in FIG.
1, and as shown in FIGS. 7 and 8, a stainless steel cap 32 serving as a reinforcing plate is press-fitted and held on the convex portion 31 to cover it. As in the first embodiment, the outer periphery of the core 30 is nickel-plated to form a covered bellows thin film body 33.
It has a structure in which the cap 32 is fixed and integrated at the same time as the cap 32 is molded.In this case as well, a notch portion 32a is formed on the outer peripheral edge of the cap 32, as shown in FIG. As shown in FIG. 8, a part 33a of the plating layer of the covered bellows thin film body 33 bites into this notch portion 32a during the plating process, thereby making it possible to increase the bonding strength.

In the above embodiments, a metal material made of aluminum was used as the core, but the core is not limited to this, and resin materials can also be used; in short, any material can be used as long as it can be dissolved in an appropriate solution can be selected.

In addition, it goes without saying that the present invention can be modified in various ways without departing from the gist of the invention.

[Effects of the Invention] As is clear from the above description, according to the present invention, a reinforcing plate is held in advance on the end surface corresponding to the covered side of the core, and this reinforcing plate is plated to form a covered bellows thin film body. At the same time, after being fixed and integrated,
Since the core is melted and removed to produce a bellows with a reinforcing plate on the lid, the reinforcing plate can be fixed and integrated at the same time as forming the covered bellows thin film body by plating. For,
There is no need for conventional cleaning work before and after soldering, soldering work, etc., and the work time can be significantly reduced, and the positioning accuracy of the reinforcing plate can be increased, reducing the rate of quality defects. It has excellent effects.

[Brief explanation of drawings]

Fig. 1 is a schematic sectional view showing a first embodiment of a bellows manufactured by the manufacturing process according to the present invention, Fig. 2 is a sectional view of the core, and Fig. 3 is a partially enlarged side view of the reinforcing plate. 4 is a schematic cross-sectional view showing the plating process, FIG. 5 is a schematic cross-sectional view showing a second embodiment of the bellows manufactured by the manufacturing process according to the present invention, and FIG. 7 is a partially enlarged side view of the reinforcing plate, FIG. 8 is a schematic sectional view showing the plating process, and FIGS. 9 to 11 show the conventional bellows manufacturing process. It is an explanatory diagram. 20, 30... core, 22, 32... reinforcing plate,
23, 33...Covered bellows thin film body (metallic layer).

Claims (1)

[Scope of Claims] 1. A meltable core whose outer periphery has a bellows inner diameter shape is used, and the outer periphery of the core is plated to form a covered bellows thin film body, and then the core is dissolved and removed. A method for manufacturing a bellows, in which a reinforcing plate is held and arranged in advance on the end face corresponding to the covered side of the core before plating, and the reinforcing plate is simultaneously formed into a covered bellows thin film body by plating. A method for manufacturing a bellows, characterized in that it is fixed and integrated. 2. The method of manufacturing a bellows according to claim 1, wherein a recess is formed in the end surface corresponding to the covered side of the core, and a reinforcing plate is previously fitted and held in the recess. 3. The method of manufacturing a bellows according to claim 1, wherein a cap-shaped reinforcing plate is previously held in a capped state on the end surface corresponding to the covered side of the core.