JPH04333319A - Production of multiplex bellows tube - Google Patents

Abstract

PURPOSE:To provide the production of a multiplex bellows tube possible to easily obtain a flexible product by forming wavy walls so that pitches between wavy walls are reduced and the diameters are enlarged as a product in a simple working equipment. CONSTITUTION:A flat metallic thin strip is pressed or rolled to form plural wavy walls over the width direction. Then, this strip is wound by roll-forming in the width direction to form a tube body and to stick wavy walls closely to each other.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a method of manufacturing a multi-wound bellows tube, which is generally used as a flexible joint for a piping connection or as a flexible tube itself in automobiles, various machines, equipment, etc. It is.

0002

[Prior Art] Conventionally, this type of manufacturing method has been based on bulge forming, in which a plurality of pipe materials are simply polymerized and then plastically deformed by hydraulic pressure or elastic pressure of a rubber material to form a corrugated wall. .

0003

[Problems to be Solved by the Invention] However, in these conventional techniques, not only do the above-mentioned processing equipment become complicated, but both the former and the latter require large diameters and narrow corrugated walls between pitches. Therefore, the product tends to have a problem of poor flexibility.

The present invention has been made in view of the above-mentioned problems of the prior art, and it is sufficient that the processing equipment used for ordinary press or roll processing is sufficient, and furthermore, the pitch between the corrugated walls can be reduced as a product. The object of the present invention is to propose a manufacturing method that can easily obtain a highly flexible multi-wound bellows tube by shaping the corrugated wall to have a large diameter.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention forms a plurality of corrugated walls in the width direction of a flat metal thin plate material by pressing or rolling, and then roll forming. A method for manufacturing a multi-wound bellows tube in which a tube body is formed by winding in the width direction by molding, and corrugated wall portions are tightly fitted together; A plurality of corrugated walls are formed in the widthwise direction, and then a tube is formed by winding in the widthwise direction by roll forming, and the corrugated walls are brought into close contact with each other. The gist of each of these is a method of manufacturing a multi-wound bellows tube, which is formed by pressing the entire body in an axial direction in a clamping manner.

[0006]

[Function] Since the present invention is based on such a manufacturing method, a flat metal thin plate material on which a corrugated wall has been formed is then wound to form a tube body, and the corrugated wall is further formed as desired. By pressing the entire part into a sandwich shape, the processing equipment can be simplified, and the pitch of the corrugated wall can be made small as a product. At the same time, by shaping the corrugated wall to make it large in diameter. This means that a highly flexible product can be easily obtained.

[0007]

[Embodiments] Hereinafter, embodiments of the present invention will be described based on the drawings. Figs. 1 to 4 are perspective views showing the manufacturing process of the present invention, and show a flat metal thin plate material made of stainless steel or the like. (1) (Fig. 1) is pressed or rolled using a pair of male and female metal fittings to form a plurality of corrugated walls (2
) was formed (Figure 2). and then roll
The tube body (3) is wound into a double coil by forming.
At the same time, a wound bellows tube (4) was obtained in which the corrugated wall (2) portions were closely connected to each other (FIG. 3). Next, the entire corrugated wall is pressed in the axial direction, or in the radial direction along with the axial direction, in a slightly pinched manner, thereby reducing the pitch and creating a double-wound corrugated wall with an enlarged diameter. Bellows tube (5
) was obtained (Figure 4).

In the above embodiment, a double-wound bellows tube has been described, but the present invention can be applied to the production of a triple-wound or more multi-wound bellows tube.

[0009]

Effects of the Invention As explained above, the method for manufacturing a multi-wound bellows tube according to the present invention involves forming a corrugated wall in advance by pressing or rolling, and then winding the tube by roll forming to tightly seal the tube. Form into a shape,
Furthermore, since the entire corrugated wall is press-formed in the axial direction in a tight state as desired, the processing equipment can be simplified, and the pitch of the corrugated wall can be reduced as a product. This is an extremely useful method for producing a multi-wound bellows tube, as it allows for easy production of highly flexible products due to the shaped shape of the corrugated wall, which can be made small and at the same time large in diameter. .

[Brief explanation of drawings]

FIG. 1 is a perspective view of the material of the present invention.

FIG. 2 is a perspective view showing the first step.

FIG. 3 is a perspective view showing a second step.

FIG. 4 is a perspective view showing a third step that is performed as necessary.

[Explanation of symbols]

1　Sheet metal material 2. Corrugated wall 3 Pipe body 4, 5 Bellows tube

Claims (2)

[Claims] Claim 1: Form a plurality of corrugated walls in the width direction by pressing or rolling a flat metal thin plate material, and then winding it in the width direction by roll forming to form a tube body. Also, a method for manufacturing a multi-wound bellows tube, characterized in that the corrugated wall portions are tightly fitted together. [Claim 2] Forming a plurality of corrugated walls in the width direction by pressing or rolling a flat metal thin plate material, and then winding it in the width direction by roll forming to form a tube body. A method for manufacturing a multi-wound bellows tube, which also comprises the steps of: closely fitting the corrugated wall portions together; and further pressing the entire corrugated wall portion in the axial direction in a clamping manner to shape the corrugated wall portion.