JPH01112078A - Manufacture of metallic bellows - Google Patents

Abstract

PURPOSE:To eliminate processing of a ground before treatment of a metallic bellow body and to reduce the number of processes, by a method wherein both end parts of a premolded metallic bellow body are secured to flanges, and the surface thereof is covered with a sheet layer, formed by corrosionproof resin, by pressurization for molding. CONSTITUTION:Both end parts 11a and 11b of a premolded metallic bellows body 11 are secured to flanges 12 and 13 by weld (a). After the outer peripheral surface thereof is surrounded with a teflon sheet 14, a pressure P is applied by means of a pressurizing device, the outer surface of the metallic bellows body 1 is covered with the teflon sheet 14 to apply corrosionproof finish. This method eliminates ground processing of the metallic bellow surface before treatment of the metallic bellows, resulting in reduction of the number of processes and enables easy provision of a uniform film thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing metal bellows.

[Prior Art] Conventionally, this type of metal bellows has been provided with corrosion resistance by coating the bellows surface with Teflon resin.

[Problems to be Solved by the Invention] However, with such conventional metal bellows, there are problems such as poor preparation of the surface of the bellows when resin coating is applied, insufficient film thickness or environmental temperature, etc. There have been problems in that the coating is likely to peel off due to this, and it is susceptible to mechanical shock.

[Object of the Invention] The present invention has been made under the above circumstances, and its purpose is to reduce the number of man-hours and facilitate manufacturing;
Another object of the present invention is to provide a method for manufacturing metal bellows that has a uniform coating and is highly anticorrosive.

[Means for Solving the Problems] In order to solve the above problems, the present invention fixes both ends of a pre-shaped metal bellows body with flanges,
The metal bellows is characterized in that the surface of the metal bellows body is coated with a sheet layer made of an anticorrosive resin under pressure.

[Function] That is, the present invention has the above configuration,
Since the sheet layer is pressurized and coated onto the surface of the metal bellows body, there is no need to prepare the surface of the metal bellows before installation, reducing the number of man-hours. Since the film can be manufactured simply by applying pressure with fluid, it is easy to manufacture and it is possible to create a uniform film thickness.

[Example] The present invention will be described below with reference to an illustrated example.

FIG. 1 shows a molded metal bellows manufactured by the manufacturing method according to the present invention, in which (1) is the metal bellows main body, and flanges (2) are provided at both ends (1a) and (1b) of the metal bellows body. (3) are each fixed. The surface of this metal bellows main body (1) is coated with an anticorrosive resin sheet layer (4) made of Teflon resin with a uniform thickness and manufactured by a manufacturing process described below.

That is, in order to manufacture the metal bellows molded body described above, as shown in FIG. ) by welding (a),
Next, after surrounding the outer peripheral surface of the metal bellows body (11) with a Teflon sheet (14), a second As shown by the dotted line in Figure 2, the Teflon sheet (14) is attached to the outer surface of the metal bellow X main body (11), and if a pressure device that can be applied to any flange is installed, This makes it possible to efficiently apply an anti-corrosion finish by making one flange blind and applying pressure from the other flange, making it easy to produce versatile bellows that can withstand any environment. It is something that can be done.

In the above embodiment, an integrally molded metal bellows was used, but the metal bellows is not limited to this, and it is also possible to use a welded type or a diaphragm coupling type in which the fluid flows inside the tube. be.

Other 1 It goes without saying that the present invention can be modified in various ways without departing from the gist of the present invention.

[Effects of the Invention] As is clear from the above description, according to the present invention, both ends of a pre-shaped metal bellows body are fixed with flanges, and the front face of the metal bellows body is made of anti-corrosion resin. It is characterized by being formed by pressurizing the sheet layer and forming the cover.This eliminates the need for surface preparation of the metal bellows surface before construction, which reduces the number of man-hours and also allows pressure to be applied using gas or fluid. It is easy to manufacture, as the film can be created by simply adding
Moreover, it has the excellent effect of being able to form a uniform film thickness.

[Brief explanation of the drawing]

FIG. 1 is a schematic half-sectional view showing an embodiment of a metal bellows molded body manufactured by the manufacturing process according to the present invention, and FIG. 2 is a schematic half-sectional view showing the same manufacturing process. (11) Metal bellows body, (11a) (1l b) end, (12) (14) flange, (14) Teflon sheet, (P) pressure.

Claims (2)

[Claims] (1) A metal bellows characterized in that both ends of a pre-shaped metal bellows body are fixed with flanges, and the surface of the metal bellows body is coated with a sheet layer made of anticorrosive resin under pressure. manufacturing method. (2) The method for manufacturing a metal bellows according to claim 1, wherein the sheet layer is made of Teflon resin.