JPH028598A - Metal elbow cover and manufacture thereof - Google Patents

Abstract

PURPOSE:To improve matching with the curvature of a pipe by applying a bulged circular arc shape to the intermediate part of an expanded sheet metal having the predetermined shape for the curvature thereof. CONSTITUTION:An elbow cover 1 is constituted with a bulged circular arc part 2 and an opposite combined projection piece 3 continuous thereto. As a result, it is possible to obtain good matching with the curvature of a pipe and no partial damage is caused due to monolithic structure, thereby ensuring the required rigidity. Also, it is possible to ensure low cost via mass production by applying the manufacture method comprising plate cutting as the first process and press molding as the second process subsequent thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a metal elbow cover that is applied as a heat-insulating/cold-insulating exterior material for various types of piping, particularly as an exterior material for curved pipe portions, and a method for manufacturing the same.

(Prior art) Exterior materials used for the purpose of heat insulating, cold insulating, and protecting various types of piping are formed from various thin plates such as aluminum, stainless steel, zinc, and colored iron plates, and both ends are joined together by simple means. structure has been adopted.

(Problems to be Solved by the Invention) When manufacturing pipe exterior materials, those for straight pipe sections can rely on simple bending and can be mass-produced at low cost, but those for curved pipe sections Conventionally, the conventional method of manufacturing is to cut out multiple plates with different shapes and dimensions, temporarily assemble these divided pieces by spot welding, and then integrate each part by soldering. Mass production was not possible, leading to high costs.

The present invention has been made to solve such problems, and includes an elbow cover having a bulging arc surface shape formed integrally by defining the shape of a developed thin metal plate material compatible with the elbow cover, and manufacturing of this elbow cover. The purpose is to provide a method.

(Means for Solving the Problems) The metal elbow cover according to the present invention has a central main body formed by opposing protruding arcuate edges and a linearly inclined edge continuous with these and having a relative angle of approximately 90 degrees, and further includes: A bulging arc surface shape is given to the central main body portion of the symmetrical unfolded thin metal plate material in which a connecting protrusion portion is formed by a parallel edge that is continuous with the straight inclined edge via a concave arc edge, and the central body portion is curved. The coupling projecting pieces are opposed to each other.

The method for manufacturing the elbow cover is a method that includes a temporary removal step of a developed thin metal plate material, and a forming step of pressurizing the central body portion of the plate material using an underwater discharge press to give it a bulging arcuate shape.

(Function) The elbow cover, which is formed by imparting a bulging arc surface shape to the central body portion of the developed thin metal plate material having a specific shape as described above, matches the curved surface of the pipe and maintains the required rigidity. Further, the underwater discharge press imparts the bulged arc surface shape with high precision.

(Example) The following description will be made based on an embodiment shown in the drawings.

That is, FIG. 1 shows the shape of the elbow cover according to the present invention, and the elbow cover 1 is composed of a bulging arc-shaped portion 2 and a connecting protruding piece portion 3 that is continuous with and faces opposite to the bulging arc surface portion 2. The bulging arc surface shape part 2 is fitted into the curved pipe part of (1) through a heat insulating/cold insulating member, and both the connecting protruding pieces 3 are bent and engaged, or overlapped and spot welded, or other appropriate means. It is connected by .

By the way, FIG. 2 shows the planar shape of the developed thin metal plate material 4 for obtaining the elbow cover 1, in which the central body portion 5 having a wide width has a protruding arcuate edge 6 having a radius R1,
Continuing with this, a straight inclined edge 7 having a relative angle of approximately 90 degrees
and further a parallel edge 9 that is continuous with the straight inclined edge 7 via a concave arc edge 8 having a radius R2.
The connecting protruding piece 3 is formed by the above.

FIG. 3 shows an example of a well-known underwater discharge press 1O in which a central body portion 5 of a developed thin metal plate 4 having a symmetrical shape as shown in FIG. 2 is curved by giving a bulging arc surface shape. , the central body portion 5 of the developed thin metal plate material 4 is molded into a female mold.
A careful inspection is placed on top, and a press action is added to this. In other words, in this type of press, a female mold 11 is placed at the inner bottom of a closed container 12, a pair of discharge electrodes 13 are exposed on both sides above, and the discharge impact force between the discharge electrodes 13 is applied via a liquid or an elastic medium. In addition to processing plate materials, the required forming is performed.

(Effects of the Invention) The present invention is made by giving a bulging arc surface shape to the central body portion of a developed thin metal plate material having a prescribed shape as described above to make it curved. Moreover, since it is a one-piece product, the required rigidity is maintained without any partial damage. In addition, the unfolded shape, that is, the first step, temporary removal, and the subsequent
The production method consisting of press molding, which is the second step, enables mass production at low cost.

[Brief explanation of the drawing]

Fig. 1 is a front and side view showing an example of the metal elbow cover of the present invention, Fig. 2 is a plan view of a developed thin metal plate material for obtaining the metal elbow cover of the present invention, and Fig. 3 is an underwater forming means. It is a sectional view showing an example of a discharge press. 1 is a metal elbow cover, 2 is a bulging arc-shaped portion, 3 is a connecting protruding piece portion, 4 is an expanded thin metal plate material, 5 is a central body portion, 6
1 is a protruding arc edge, 7 is a straight inclined edge, 8 is a concave arc edge, 9 is a parallel edge, and 10 is an underwater discharge press. Patent applicant Niss, M Kako Co., Ltd.

Claims (2)

[Claims] (1) An opposing protruding arc edge and continuous to the protruding arc edge,
A central body portion having a wide width is formed by a straight inclined edge having a relative angle of approximately 90 degrees, and a joining protrusion is formed by a parallel edge continuous with the straight inclined edge through a concave arc edge. A metal elbow cover characterized in that the central main body portion of the expanded thin metal plate is curved by giving a bulging arcuate shape, and the connecting protrusion portions are opposed to each other. (2) cutting out the developed thin metal plate material according to claim 1;
A method for manufacturing a metal elbow cover, comprising a forming step of pressurizing the central body portion of the plate material using a horizontal discharge press to give it a bulging arc surface shape.