JP2905494B2 - Electroplated bellows - Google Patents

Description

The present invention relates to an electrodeposition bellows formed by electrodeposition (electroforming) of a nickel-based metal.

[Prior Art] For example, as a contact device used for an electromagnetic switch, a power relay, and the like, a fixed contact and a fixed contact are placed in a container in which a gas having an arc cooling ability such as hydrogen or a mixed gas of hydrogen and nitrogen is sealed. There is a sealed contact device provided with a movable contact. In this contact device, the arc generated when the contacts are opened is extinguished in a short time due to the arc cooling action of the sealed gas, and the consumption of the setting is reduced, so that the contact life is long.

For this sealed contact device (or sealed contact device), an electrodeposited bellows that is manufactured using an electrodeposition method and that expands and contracts while maintaining high airtightness is used.

Conventionally, the electrodeposited bellows is formed of a single layer of nickel or a multilayer (Ni-Cu-Ni) structure of nickel and copper.

[Problems to be Solved by the Invention] However, when the electrodeposited bellows configured as described above is subjected to a high-temperature heat treatment (for example, 850 ° C), there is a problem that the tensile strength is reduced, a problem that the yield strength is significantly reduced, and a problem of fatigue. There was a problem that the strength was reduced.

The present invention has been made in view of the above description, and an object of the present invention is to provide an electrodeposited bellows which does not have a risk of lowering tensile strength, yield strength and fatigue strength even when subjected to a high-temperature heat treatment. It is in.

[Means for Solving the Problems] In order to achieve the above object, the electrodeposited bellows A of the present invention comprises a bellows-like bellows film 1 formed of three metal layers 1a, 1b, 1c, and three metal layers. The central metal layer 1b is formed of a metal containing P or B in Ni, and the metal layers 1a and 1c on both sides of this metal layer are formed of a metal layer of Ni or a Ni-Cu alloy or a Ni-Fe alloy. It is characterized by being formed.

[Effect] An electrodeposited bellows A is formed without a risk of a decrease in tensile strength, yield strength or fatigue strength even when subjected to a high-temperature heat treatment.

[Example] As shown in FIG. 1 (a), a prototype 2 serving as a temporary base for forming a bellows-like bellows film 1 by electrodeposition is made of aluminum in a bellows shape in which peaks 2a and valleys 2b are alternately formed as shown in FIG. Is formed of such a material. This prototype is placed in a salt bath and metal is electrodeposited to form a bellows film 1. In the present invention, a plurality of types of metals are electrodeposited to form three metal layers 1a, 1b and 1c. You. Metals forming the metal layers 1a, 1b, 1c include metal A and metal B. As shown in the table below, metal B is Ni or Ni-Cu alloy or Ni-Fe alloy, and metal B is P or B. Ni (3-20% for P, 0.1-10% for B).

In the case of the embodiment of FIG. 2A, the metal layers 1a and 1c are formed by electrodepositing a metal A, and the metal layer 1b is formed by electrodeposition of a metal B.
In the case of the embodiment shown in FIG. 2 (b), the metal layers 1a and 1c are formed by electrodeposition of metal and the metal layer 1b is formed by electrodeposition of metal A.
The metal may be attached by electrolysis or electroless. Prototype 2
After electrodepositing a plurality of metal layers 1a, 1b, and 1c, the prototype 2 is dissolved with a sodium hydroxide solution or the like to form a bellows-like electrodeposited bellows A as shown in FIG. 1 (c). When a plurality of metal layers 1a, 1b, 1c are formed from metal A or metal B, the tensile strength, yield strength, and fatigue strength do not decrease even when the electrodeposited bellows A is subjected to high-temperature heat treatment (850 ° C.). Was. For example, the yield strength was improved as shown in the following table, the stress range showing the spring characteristics was expanded, and the use range was widened.

Next, the strength of a single Ni layer and the strength of a three-layer Ni- (Ni-P) -Ni layer will be specifically compared.

<In the case of Ni single layer> Using a nickel sulfamate bath as a bath type of the salt bath,
Ni was electrodeposited under the conditions of a bath temperature of 60 ° C., a pH of 4.0, and a current density of 2.0 A / dm ² to form a test piece 3 having a shape as shown in FIG. 3A and a thickness of 0.022 mm. Where a is 35 mm, b is 5 mm, c is 10 mm, l is 2
0 mm and R are 12.5 mm. The test piece 3 was heat-treated at 850 ° C. (vacuum) for 1 hour and subjected to a tensile test to obtain a result as shown in FIG. 3 (b). FIG. 3 (b) is a stress-strain diagram, in which the vertical axis indicates stress and the horizontal axis indicates tensile strain. The strain ε is ε
= L'-l / l. From the results, it can be seen that in the case of a single Ni layer, the yield point y is as low as 9.8 kgf / mm ² , plastic deformation tends to occur, and the range of use as a spring is narrow.

<In the case of three layers of Ni- (Ni-P) -Ni> A three-layer structure of Ni layer A and Ni-P layer B as shown in FIG. 4 (a) and the shape shown in FIG. 3 (a) And the test piece 3 with the same size was formed. Ni layer A is Sluronic CM as bath type
Bath temperature 60 ° C, pH 4.0, current density 2.0A /
Electrodeposition was performed so that the film thickness became 16 μm at dm ² . In the case of Ni-P layer b, top Nicolon YS-45 (manufactured by Okuno Pharmaceutical Co., Ltd.) is used as the bath type, and Ni having a P content of 10 to 12% is electrolessly formed at a bath temperature of 90 to 95 ° C. to a thickness of 3 μm. It was formed so that it might become. FIG. 4 (b) shows a tensile test of the test piece 3 thus formed. In this figure, the vertical axis indicates stress, and the horizontal axis indicates tensile strain. From this result, Ni- (Ni-
In the case of the three layers of P) -Ni, the yield point y is as high as 32.8 kgf / mm ² , which indicates that plastic deformation is difficult and the range of use as a spring is wide. The strengths of the three-layer Ni- (Ni-P) -Ni and the single-layer Ni are as follows.

Next, an example of the contact device 5 using the electrodeposition bellows A formed as described above will be described with reference to FIG. The contact device 5 includes a container in which a substantially disk-shaped fixed contact 6 and a movable contact 7 made of, for example, tungsten are accommodated. The container includes a body 8, a lower plate 9, an upper plate 10, and a support cylinder 11. These members are joined in an airtight manner. Insulating members inside the lower plate 9 and the upper plate 10, respectively
12 and 13 are provided. The fixed setting 6 is fixed to the tip of the fixed terminal 14. The fixed terminal 14 is fixed to the lower plate 9 by caulking or the like. The lower plate 9 is provided with a conductive ventilation pipe 15 used for filling the filling gas. The fixed contact 6 is electrically connected to the outside through the fixed terminal 14, the lower plate 9, and the conductive member of the ventilation pipe 15. In this use example, the ventilation tube 15 is used as a conductive terminal. The movable contact 7 is fixed to the tip of the contact terminal shaft 17. The rear end of the contact terminal shaft 17 goes out of the container through the holes 13a and 10a. Support tube 11 and contact terminal shaft, which are part of the container
The space 17 is airtightly closed by the electrodeposition bellows A. One end A ₁ electrical bellows A the other end A ₂ to the supporting cylinder 11 is coupled to a respective hermetically contact terminal shaft 17. The contact terminal shaft 17 is movable in a direction to separate the movable contact 7 and the fixed contact 6. In the case of a relay or the like, the contact terminal shaft 17 is configured to be moved by an electromagnet (not shown). Electrodeposited bellows A makes contact terminal shaft 17 movable,
Moreover, it is used for airtight bonding. The electrodeposited bellows A is joined by, for example, brazing. In addition,
For example, hydrogen and nitrogen are mixed in the gas sealed in the container, and the mixing ratio of nitrogen is 20 to 97%.

Electrodeposited bellows A with contact device 5 configured as described above
When installing, after assembling each part, about 700 ℃
For 30 minutes, and braze the electrodeposited bellows A. When brazing, heat treatment is performed for 5 minutes in a vacuum furnace at a temperature of 850 ° C. and vacuum degassing is performed. By brazing as described above in manufacturing, it is possible to secure a degree of vacuum (vacuum heating deaeration), reduce the size (reduce the number of parts), and improve productivity. If the above brazing is not used, the apparatus becomes large (a structure for evacuating the parts is necessary), the productivity is reduced (vacuum time loss), and the deaeration process other than the vacuum heating is performed. Need to be applied.

[Effects of the Invention] In the present invention, as described above, a bellows-like bellows film is formed of three metal layers, and the central metal layer of the three metal layers is formed of Ni.
Is formed by a metal layer containing P or B, and the metal layer on both sides of this metal layer is formed by a metal layer of Ni or a Ni-Cu alloy or a Ni-Fe alloy. Also, the tensile strength, the yield strength, and the fatigue strength are not reduced, and the stress range showing the spring characteristics is expanded, and the use range is expanded.

[Brief description of the drawings]

FIGS. 1 (a), 1 (b) and 1 (c) are cross-sectional views and a half cross-sectional view of a process for manufacturing an electrodeposited bellows of the present invention, and FIGS. 2 (a) and 2 (b).
Is an enlarged sectional view of the bellows film, FIG. 3 (a) is a plan view showing a test piece, FIG. 3 (b) is a stress-strain diagram in the case of a single Ni layer, and FIG. FIG. 4 (b) is a stress-strain diagram in the case of three layers of Ni- (Ni-P) -Ni, and FIG. 5 is a perspective view of a contact device using the above electrodeposited bellows. A is an electrodeposited bellows.

Continuation of front page (56) References JP-A-50-26940 (JP, A) JP-A-62-234655 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16J 3 / 00-3/06 H01H 33/60-33/68

Claims (1)

(57) [Claims] A bellows-like bellows film is formed of three metal layers, and a central metal layer of the three metal layers is formed of a metal layer containing Ni or P or B. An electrodeposited bellows, wherein the metal layers on both sides of the metal layer are formed of a metal layer of Ni or a Ni-Cu alloy or a Ni-Fe alloy.