JPH06229495A - Seamless elbow, manufacture and device thereof - Google Patents

Abstract

PURPOSE:To reduce the manufacturing processes in an elbow for piping of air and the like by forming a shrank diameter cylindrical part in each of plural curved cylindrical bodies in the end part of the axial direction and connecting plural curved cylindrical bodies together so that the shrank diameter cylindrical part is formed in each of both end parts of a connection body. CONSTITUTION:A bottomed curved cylindrical body 7 made of a metal plate is extruded and formed by a press male die 8 and a press female die 9, both of which move circularly setting a rotational center 10 as the center. The bottom part 6 of the bottomed curved cylindrical body 7 is pressed further by a point shrank diameter cylindrical body forming part 11 of the press male die 8, so that a shrank diameter cylindrical part. is formed between the point shrank diameter cylindrical body forming part 11 and the a shrank diameter cylindrical body forming part 12 in the end of the female die 9. A connection body is formed by connecting the curved cylindrical bodies, in each of which a shrank diameter cylindrical part is formed in its end part in this way, together so that the shrank diameter cylindrical parts are located in both ends.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seamless elbow, a method for manufacturing the elbow, and an apparatus for manufacturing the elbow.

[0002]

2. Description of the Related Art Conventionally, an elbow has been necessary in a piping work in which a fluid such as air or water has to be passed, and particularly in a piping work between straight pipes, it is necessary to connect adjacent straight pipes to each other. When the directions are different, the connecting portions of each member of the elbow are provided in the direction orthogonal to the axis of each member of the elbow without directly connecting the straight pipes, and the straight pipes are connected in the direction of the axis of the elbow. By arranging and connecting a plurality of members in series toward each other, a shape having a bent cylindrical shape as a whole has been used.

[0003]

Strictly speaking, therefore, the shape of the above-mentioned bent cylindrical shape has a polygonal outline, and when such an elbow is used, air flowing in the elbow or Fluids such as water tend to flow in a turbulent state, and pressure loss tends to increase due to the flow in a turbulent state. Further, as described above, the connecting portion of each member of the elbow is provided in the direction orthogonal to the direction of the axis of each member of the elbow, and a plurality of members are connected in series in the direction of the axis of the elbow. As a result, since the shape is formed into a bent cylindrical shape, the number of manufacturing steps increases, and the technical content of each manufacturing step becomes complicated, which causes various problems in manufacturing. The invention of the present application aims to solve these problems.

[0004]

According to the invention of the present application, a reduced diameter cylindrical portion is formed at an end portion in the axial direction of each of a plurality of curved cylindrical bodies, and the plurality of curved cylindrical bodies are joined together. A seamless elbow in which reduced diameter cylindrical portions are formed at both ends of a body, a method for manufacturing the elbow, and a device for manufacturing the elbow.

[0005]

In the seamless elbow of the invention of the present application, a diameter-reduced cylindrical portion is formed on each of the plurality of curved cylindrical bodies at the end in the axial direction, and a joint of the plurality of curved cylindrical bodies is formed. Since the diameter-reduced cylindrical portions are formed at both ends, the diameter-reduced cylindrical portions disposed at both ends of the connected curved cylindrical body can be easily and securely connected to another connecting cylindrical body or a connecting straight pipe. Can be connected to. Further, the seamless elbow of the invention of the present application forms a reduced diameter cylindrical portion at the end of the curved cylindrical body in the axial direction, and reduces the reduced diameter of the end of another curved cylindrical body. Since the portion on the opposite side of the diameter cylindrical portion can be fitted, even an unskilled person can easily work. Further, the seamless elbow of the invention of the present application forms a reduced diameter cylindrical portion at an end portion in the axial direction of a curved cylindrical body, and another curved cylindrical body is formed on a portion opposite to the reduced diameter cylindrical portion. Since the opposite side of the reduced diameter cylindrical part of the end of the is connected by joining, the reduced diameter cylindrical part of the end of the curved cylinder can be easily fitted to the end of a general straight pipe. Even if you are not an expert, you can work easily. Further, the seamless elbow of the invention of the present application has a diameter-reduced portion formed integrally with and continuously formed in the curved cylindrical portion so as to project, and another curved cylindrical body with the curved cylindrical body is prepared. The two curved cylinders are arranged at both sides, the reduced diameter cylindrical portions at both ends of the two curved cylinders are arranged at both ends, and the wide mouth opening of the two curved cylinders is arranged. By connecting them directly or by interposing another curved cylindrical body between the wide mouth openings of the curved cylindrical body which face each other, and connecting the curved cylindrical connecting portion. Since the desired cylindrical bodies connected to each other are formed and the reduced diameter cylindrical portions located at both end positions of the connected curved cylindrical bodies can be connected to other connecting cylindrical bodies, they can be easily manufactured. In addition, it is not always necessary for an expert Even without can no easily the construction work. And even when it is used, its structure is easy for anyone to understand.
Even if a situation such as a failure or damage is encountered, it is easy to respond promptly. Further, the seamless elbow manufacturing apparatus and the manufacturing method by the manufacturing apparatus of the invention of the present application are a partial structure of a bent cylindrical body made of a metal flat plate by a male die of a press performing an arc motion and a female die for receiving the male die. Formed by squeezing out the curved cylindrical body assembly component for the curved cylindrical body to be the body,
Forming the curved cylindrical body assembly component for the curved cylindrical body, further pressing by a male mold of the press to form a reduced diameter cylindrical body in the axial direction of the curved cylindrical body, A reduced diameter portion integrally formed continuously with the portion is projected, and another curved cylindrical body having the same shape as the curved cylindrical body is prepared, and at the time of coupling the two curved cylindrical bodies, In order to position the reduced diameter portion of the curved cylindrical body at the end position, the reduced diameter portion of each curved cylindrical body is arranged at both end positions, and the wide mouth openings of these two curved cylindrical bodies are directly connected. Or, by forming another curved cylinder by interposing another curved cylinder between the wide-mouth openings of the two curved cylinders to form a curved cylinder connected to each other. And both of its connected curved cylinders Since the arranged has been reduced diameter cylindrical portion at a position and so can be connected to other connection cylinder or connecting straight pipe, it can provide a seamless elbow suitable for mass production. Further, the seamless elbow manufacturing apparatus and the manufacturing method by the manufacturing apparatus of the invention of the present application, a bottomed curved cylindrical body is formed from a metal flat plate by a male die of a press performing an arc motion and a female die for receiving the male die. Formed by squeezing out, the bottom of the bottomed curved cylindrical body is further pressed by a male die of the press to form a reduced diameter cylindrical body in the axial direction of the curved cylindrical body, and the curved cylindrical portion is formed. And a curved cylindrical body having the same shape as the curved cylindrical body mentioned above is prepared.When connecting the two curved cylindrical bodies, each curved cylindrical body is formed. In order to locate the reduced diameter portion of the curved cylindrical body at the end position, arrange the reduced diameter portion of each curved cylindrical body at both ends and connect the wide mouth openings of these two curved cylindrical bodies directly. Or the wide mouth opening of those two curved cylinders A curved cylindrical body is formed by connecting adjacent curved cylindrical bodies with another curved cylindrical body interposed between the curved curved cylindrical body and the curved curved cylindrical body. Since the reduced diameter cylindrical portion can be connected to another connecting cylinder or a connecting straight pipe, a seamless elbow suitable for mass production can be provided.

[0006]

Embodiment 1 The invention of the present application is a curved cylinder for a curved cylinder, which is a partial structure of a curved cylinder made of a metal flat plate by a male mold of a press performing an arc motion and a female mold for receiving the male mold. Formed by squeezing out the body assembly component, to each of the curved cylinder assembly component for the curved cylinder,
Further, it is pressed by a male mold of the press to form a reduced diameter cylindrical body in the axial direction at the end portion of the curved cylindrical body, and a reduced diameter portion integrally formed continuously with the curved cylindrical portion is projected. Install another curved cylinder with the same shape as the curved cylinder described above, and when connecting the two curved cylinders, place the reduced diameter part of each curved cylinder at the end position. For this purpose, the reduced diameter parts of the curved cylinders are arranged at both ends, and the wide mouth openings of the two curved cylinders are directly connected to each other, or the wide mouth openings of the two curved cylinders are connected. A curved cylindrical body connected to each other is formed by connecting another curved cylindrical body connected to each other with another curved cylindrical body interposed therebetween, and the curved cylindrical bodies are connected to each other at both end positions. A cylindrical body for connecting the reduced diameter cylindrical portion to another connection There is a manufacturing apparatus of seamless elbow which is adapted be connected to the connecting straight pipe.

[0007]

[Embodiment 2] The invention of the present application is formed by squeezing out a bottomed curved cylinder from a metal flat plate by a male die of a press performing an arc motion and a female die for receiving the male die. The bottom of the body is further pressed by the male mold of the press,
A reduced diameter cylindrical body is formed in the axial direction of the curved cylindrical body, and a reduced diameter portion integrally formed continuously from the curved cylindrical body is provided in a protruding manner, and the curved shape of the curved cylindrical body is the same. Prepare another cylinder, and when connecting the two curved cylinders, in order to position the reduced diameter part of each curved cylinder at the end position, reduce the diameter of each curved cylinder at both ends. Located at a position and directly connecting the wide mouth openings of the two curved cylinders, or adjoining each other with another curved cylinder interposed between the wide mouth openings of the two curved cylinders. A curved cylindrical body connected to each other is formed by connecting the connecting portions of the curved cylindrical body, and the reduced-diameter cylindrical portions arranged at both ends of the connected curved cylindrical body are connected to each other. Alternatively, it is a seamless joint that can be connected to a straight pipe for connection. It is a manufacturing apparatus of the elbow.

[0008]

[Effect] The seamless elbow according to the invention of the present application forms a reduced-diameter cylindrical portion at each end of the curved cylindrical bodies in the axial direction, and connects the curved cylindrical bodies to each other. Since the diameter-reduced cylindrical portions are formed at both ends, the diameter-reduced cylindrical portions disposed at both ends of the connected curved cylindrical body can be easily and securely connected to another connecting cylindrical body or a connecting straight pipe. There is an effect that can be connected to. Further, the seamless elbow of the invention of the present application forms a reduced diameter cylindrical portion at the end of the curved cylindrical body in the axial direction, and reduces the reduced diameter of the end of another curved cylindrical body. Since the portion on the opposite side of the diameter cylindrical portion can be fitted, there is an effect that even an unskilled person can easily work. Further, the seamless elbow of the invention of the present application forms a reduced diameter cylindrical portion at the end portion in the axial direction of the curved cylindrical body,
The opposite side of the diameter-reduced cylindrical portion is made to butt and join the opposite side of the diameter-reduced cylindrical portion of the end of the other curved cylinder, so that it can be connected to the end of a general straight pipe. Since the reduced diameter cylindrical portion at the end of the curved cylindrical body can be easily fitted, there is an effect that even an unskilled person can easily work. Further, the seamless elbow of the invention of the present application has a reduced diameter portion formed integrally with the curved cylindrical portion so as to be continuous therewith.
Prepare another curved cylinder with the curved cylinder,
The two curved cylinders are arranged at both sides, the reduced diameter cylindrical portions at both ends of the two curved cylinders are arranged at both ends, and the wide mouth opening of the two curved cylinders is arranged. By connecting them directly or by interposing another curved cylindrical body between the wide mouth openings of the curved cylindrical body which face each other, and connecting the curved cylindrical connecting portion. Since the desired cylindrical bodies connected to each other are formed and the reduced diameter cylindrical portions located at both end positions of the connected curved cylindrical bodies can be connected to other connecting cylindrical bodies, they can be easily manufactured. In addition to the above, there is an effect that even a non-skilled person can easily perform the construction work in the construction. And when using it,
Since the structure is easy for anyone to understand, there is an effect that even if a situation such as a failure or damage is encountered, it can be promptly dealt with. Further, the elbow according to the method for manufacturing a seamless elbow of the invention of the present application is a curved structure that is a partial structure of a curved cylindrical body made of a metal flat plate by a male die of a press performing an arc motion and a female die for receiving the male die. A curved cylindrical body assembly component for a cylindrical body is squeezed out to form the curved cylindrical body assembly component for the curved cylinder body, which is further pressed by a male die of a press to form an axis line of the curved cylinder body. Forming a diameter-reduced cylindrical body in a direction, and projecting a diameter-reduced portion integrally formed to be continuous with the portion of the curved cylindrical body, and another curved cylindrical body having the same shape as the curved cylindrical body. Prepared, when connecting the two curved cylinders, in order to position the reduced diameter portion of each curved cylindrical body at the end position, arrange the reduced diameter portion of each curved cylindrical body at both end positions, Wide mouth opening of those two curved cylinders Wraps connected to each other either by directly connecting each other or by connecting another bent cylinder adjacent to each other with another bent cylinder interposed between the wide mouth openings of the two bent cylinders. Suitable for mass production because a curved cylinder is formed, and the reduced diameter cylindrical parts arranged at both ends of the connected curved cylinder can be connected to other connecting cylinders or connecting straight pipes. There is an effect that can provide a seamless elbow. Further, the elbow produced by the seamless elbow manufacturing apparatus of the invention of the present application is formed by squeezing out a bottomed curved cylindrical body from a metal flat plate by a male die of a press performing an arc motion and a female die for receiving the male die. , The bottom of the bottomed curved cylinder is further pressed by a male die of the press to form a reduced diameter cylindrical body in the axial direction of the curved cylinder, and continuously connecting to the curved cylinder part. An integrally molded reduced-diameter portion is provided so as to project, and another curved cylindrical body having the same shape as the curved cylindrical body is prepared, and when the two curved cylindrical bodies are connected, each curved cylindrical body is formed. In order to position the reduced diameter portion at the end position, the reduced diameter portion of each curved cylinder is arranged at both ends, and the wide mouth openings of the two curved cylinders are directly connected to each other or Other bends between the wide-mouth openings of a curved cylinder A curved cylindrical body connected to each other is formed by connecting the connecting portions of the curved cylindrical bodies that are adjacent to each other with a cylindrical body interposed therebetween, and a reduced diameter cylinder disposed at both ends of the connected curved cylindrical body. Since the portion can be connected to another connecting cylinder or the connecting straight pipe, there is an effect that a seamless elbow suitable for mass production can be provided. In particular, the seamless elbow of the invention of the present application is configured as a conventional bent cylinder because its shape is virtually a completely curved cylinder, and its inner surface does not become a resistance portion against the flow of fluid. Compared to the elbow, the pressure loss can be significantly reduced. Further, the seamless elbow of the invention of the present application is such that each of the plurality of curved cylindrical bodies is formed with a reduced diameter cylindrical portion at an end portion in the axial direction thereof, and at least a combined body of the plurality of curved cylindrical bodies is formed. Since the contours of the reduced-diameter cylindrical portions formed on both ends of the structure have a substantially straight-cylindrical structure, there is an effect that the reduced-diameter cylindrical portion can be easily connected to another connecting cylinder or a connecting straight pipe. . Further, in the seamless elbow of the invention of the present application, when connecting the reduced-diameter cylindrical portion to another curved connecting cylindrical body of the same shape, a bent metal cylindrical body made of a metal plate such as an iron plate or an aluminum plate is used. There is an effect that it can be easily fitted and surely connected by utilizing the elasticity that it has. Further, the seamless elbow of the invention of the present application shortens the diameter-reduced cylindrical portion formed at the end portion in the axial direction thereof as long as the circumstances allow, but the length is so short that it does not cause trouble. The effect is to select and combine a desired number of curved cylinders to provide a seamless elbow in which the combination of curved cylinders is effectively a single structure.

[Brief description of drawings]

FIG. 1 is a side view of a completed assembly of a seamless elbow according to the invention of the present application.

FIG. 2 is a perspective view showing a semi-finished product state of a bottomed curved cylinder that constitutes a member of a completed assembly of a seamless elbow according to the invention of the present application in a drawing process of the member. is there.

FIG. 3 is a vertical cross-sectional view of FIG.

FIG. 4 is a side view of a reduced diameter cylindrical body formed by drawing the semi-finished product state member shown in FIGS. 2 and 3 with a bottomed cylindrical drawing device.

FIG. 5 is a diameter-reduced cylinder in a bottomed cylindrical drawing device used in a drawing process of a bottomed curved cylinder, which is a member of a completed assembly of a seamless elbow according to the present invention. FIG. 6 is a vertical cross-sectional view conceptually showing an operating state of the forming apparatus.

FIG. 6 is a drawing device of a bottomed cylindrical body used in a drawing process of a bottomed curved cylinder, which is a member of a completed assembly body of the seamless elbow according to the present invention shown in FIG. FIG. 6 is a vertical cross-sectional view conceptually showing a state in which the male mold of the press is brought closer to the female mold of the press from the state before the operation of the reduced diameter cylindrical body forming device in FIG.

[Explanation of symbols]

1 Assembled body of seamless elbow 2 Reduced diameter cylindrical part 3 Curved cylinder 4 Flange 5 Wide mouth opening of curved cylinder 6 Bottom of curved cylinder with bottom 7 Curved cylinder with bottom 8 Circular arc motion Male mold of press to be performed 9 Female mold for receiving male mold of press 10 Rotation center of diameter-reducing cylinder body forming device 11 Diameter-reduction cylinder body forming portion at tip of male mold 12 Diameter-reducing cylinder body forming portion at rear end of female mold

Claims (10)

[Claims] 1. A reduced diameter cylindrical portion is formed at each end of the plurality of curved cylindrical bodies in the axial direction, and a reduced diameter cylindrical portion is provided at both ends of a combined body of the plurality of curved cylindrical bodies. Formed seamless elbow. 2. A plurality of curved cylinders each having a diameter-reduced cylindrical portion continuously formed integrally at its axial end, and both end portions of a combined body of the curved cylinders. A reduced-diameter cylindrical portion is formed on the reduced-diameter cylindrical portion, and the reduced-diameter cylindrical portion formed on both ends of the bent cylindrical body can be connected by fitting another connecting cylindrical body or a connecting straight pipe. The seamless elbow described in 1. 3. A diameter-reduced cylindrical portion is continuously formed at each end of the two curved cylindrical bodies at its axial end, and a diameter-reduced portion is formed at both ends of a combined body of these two curved cylindrical bodies. A cylindrical portion is formed so that the reduced diameter cylindrical portion formed at both ends of the joined body of the curved cylindrical body and another connecting cylindrical body or a connecting straight pipe can be connected to each other, and the two curved cylinders described above. 2. The seamless elbow according to claim 1, wherein the respective wide mouth openings of the body are directly connected by welding, soldering, fitting, or other suitable fixing means. 4. A reduced diameter cylindrical portion is formed at an end portion in the axial direction of the curved cylindrical body, and the reduced diameter cylindrical portion is provided on the opposite side of the reduced diameter cylindrical portion at the end portion of the other curved cylindrical body. The seamless elbow according to claim 1, wherein the portion can be fitted. 5. A reduced diameter cylindrical portion is formed at an end portion in the axial direction of the curved cylindrical body, and a reduced diameter cylinder at the end portion of another curved cylindrical body is formed at a portion opposite to the reduced diameter cylindrical portion. The seamless elbow according to claim 1, wherein parts opposite to the parts are butted and joined together. 6. A reduced-diameter cylinder formed on each of a plurality of curved cylinders, with a reduced-diameter cylindrical portion formed at an end portion in the axial direction thereof, and formed on both ends of a combined body of the plurality of curved cylindrical bodies. 2. The seamless elbow according to claim 1, wherein the contour of the portion has a substantially right-cylindrical structure. 7. A bent cylinder assembly assembly member for a bent cylinder, which is a partial structure of a bent cylinder made of a metal flat plate, is squeezed out by a male die of a press performing an arc motion and a female die for receiving the male die. Then, each of the bent cylinder assembly components for the bent cylinder is pressed by the male mold of the press to form a reduced diameter cylindrical body in the axial direction at the end of the bent cylinder. 2. The method for producing a seamless elbow according to claim 1, wherein the diameter-reduced portion is projected by being integrally formed integrally with the curved cylindrical portion. 8. When connecting two curved cylindrical bodies, the reduced diameter portions of each curved cylindrical body are positioned at the end positions, so that the reduced diameter portions of each curved cylindrical body are disposed at both end positions. However, the curved cylinders that are adjacent to each other with the wide-mouth openings of the two curved cylinders directly connected to each other or with another curved cylinder interposed between the wide-mouth openings of the two curved cylinders. Forming curved cylindrical bodies connected to each other by connecting the connecting portions of the body, and then reducing the diameter-reduced cylindrical portions arranged at both ends of the connected curved cylindrical bodies to other connecting cylindrical bodies or The method for manufacturing a seamless elbow according to claim 1, wherein the method is capable of connecting with a straight pipe for connection. 9. A bottomed curved cylinder is formed by squeezing out a bottomed curved cylinder from a metal flat plate by a male die of a press performing an arc motion and a female die receiving the male die, and then the bottom of the curved bottomed cylinder. Was pressed by a male mold of the press to form a diameter-reduced cylinder in the axial direction of the curved cylinder, and a diameter-reduced portion integrally formed continuously with the curved cylinder was projected. The method for manufacturing a seamless elbow according to claim 1. 10. A bottomed curved cylindrical body can be formed by squeezing out a bottomed curved cylindrical body from a metal flat plate by a male die of a press performing an arc motion and a female die receiving the male die. Can be pressed by a male mold of the press to form a reduced diameter cylindrical body in the axial direction of the curved cylindrical body, and a reduced diameter portion integrally formed continuously with the curved cylindrical body can be projected. The seamless elbow manufacturing apparatus according to claim 1.