JPS58207387A - Production of bellows - Google Patents

Abstract

PURPOSE:To produce a bellows having a uniform wall thickness, by deviding electrodeposition to two times, and performing electrodeposition from the outside with either one time and from the inside with the other one time. CONSTITUTION:A conductive film is applied first on the outside of a base plate 1 of wax or the like by a silver mirror or the like, whereafter said plate is subjected to electroforming with a plus electrode 2 around the same while the plate 1 is rotated. Then, the part near the electrode 2 is electrodeposited thickly and the part further therefrom is electrodeposited thinly. The bellows 3 produced by the electrodeposition is removed by melting the wax, and is electrodeposited on the inside with a plus electrode 4 placed on the inside in the 2nd stage. The bellows is this time electrodeposited thickly on the inside and thinly on the outside by the electroforming. The thickness is leveled off with the intensity and distance of the voltage of said electrode 4, whereby the bellows having a uniform thickness is produced.

Description

[Detailed description of the invention] The present invention relates to a method of manufacturing a bellows by electroforming.

Traditionally, bellows have been used as elastic connectors, but while bellows made by electroforming are precise, those made using conventional manufacturing methods have uneven wall thickness, with the thickness of the convex and concave parts being different. The thicker parts have poor elasticity, and the thinner parts have weaker strength, and this is due to the fact that they are made by electroforming in one direction.

The present invention performs electroforming in two stages to achieve uniform electroforming.3 The following description will be made with reference to the drawings.

First, as shown in FIG. 1(A), a base 1 made of wax or the like is coated with a conductive film made of a normal silver mirror or the like in the case of a nonconductor such as wax, which is to be electroformed using the surrounding electrode 2. Of course, it is preferable to perform electroforming while rotating the base 1 in order to achieve uniform electrodeposition. When using l/'lo, the part near the positive electrode is thicker and the part farther away is thinner. 3. Next, the bellows 3 thus produced is taken out by melting the wax, etc., and in a second step, it is electrodeposited from the inside as shown in FIG. 1 (b). Then, since the positive electrode 4 is inside, electrodeposition can be performed by electroforming, thick on the inside and thin on the outside. Depending on the strength and distance of this cedar voltage, it is possible to level it out and perform uniform electrodeposition.51 Next, Figure 2 shows the same effect produced by the reverse method, first placing the electrode 5 on the inside. A base 6 made of flexible rubber or the like is placed on the outside, and electrodeposition is performed by casting 1. Then, a thick electrodeposition occurs on the inside.
16.Remove flexible rubber etc. from base 6 1, 2
At this stage, the electric current 4 from the electrode 7 from the outside as shown in FIG.
°) is 1006, then bellows 3 with uniform wall thickness is r4t
It is also possible to obtain a uniform pan by adjusting the voltage, distance, and other factors.

[Brief explanation of the drawing]

Figure r1 shows an embodiment of the present invention.
B) is a partially sectional front view of one embodiment, FIG. 2(A),
(B) is a partially sectional front view of each of the other embodiments. Explanation of symbols 1... Base 2... Positive electrode 3... Bellows 4... Positive electrode 5... Positive electrode 6...
...Base 1 - Positive electrode patent applicant (Odensha Co., Ltd., Figure 1 (a), (b), Figure 2). °′ beat series

Claims (3)

[Claims] (1) Divide electrodeposition 4 into two times, and perform electrodeposition from the outside in one of the times. ! A method for producing Berl, which performs electrodeposition from the inside with I. (2) Electrodeposit λ4 from the outside first, then
A method for manufacturing a bellows according to claim 1, wherein the bellows is electrodeposited from the inside. (3) First, electrodeposit from the inside, and then
c. The method for manufacturing a bellows according to claim 1, wherein electrodeposition is performed on the outside.