JPH05245561A - Throttle joint pipe and its manufacture - Google Patents

Abstract

PURPOSE:To obtain the smooth flowing of fluid, to increase the resistance to the inner pressure and to easily and surely realize a method capable of integrally forming a throttle joint pipe with compression by using the joint pipe integrally compressive-forming a pipe wall having thick thickness being a metallic material. CONSTITUTION:The seamless throttle joint pipe 1 integrally compressive-forming a throttle opening pipe part 2 and a enlarged opening pipe part 3 having the thick thickness with a metallic material is constituted. Further, the metal plate having the thick thickness is made to be a vessel-like base body and successively, the center of the bottom part in the base body is once pressed inward to make a projecting part and the projecting part is drawn outward and compressive-formed to a bulging part, and the tip part of the projecting part is cut and the whole base body is compressive-formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a squeeze joint made of a metal material for connecting different diameter pipes having different diameters when laying metal pipes for circulating a fluid, particularly a liquid such as treated water. Regarding tubes.

[0002]

2. Description of the Related Art Conventionally, this type of compact joint pipe (12) is shown in FIG.
In the case of a material made of a metal material having an extremely thin wall as shown in Fig. 3, a squeeze pipe part (13) and an expansion pipe mouth part are obtained by drawing an off-the-shelf metal pipe body using a diameter drawing machine. A compact (reducer-like) joint pipe (12) integrally formed with (14) is obtained, but a relatively compact (about 10 mm or more) compact joint pipe (12).
However, since the integral forming by this drawing process exceeds the limit of the drawing capacity of the ready-made pipe and the diameter drawing machine and the expansion and contraction process is difficult, the small-diameter pipe (13) and the large-diameter pipe (14) have a space between their ends. The both ends are welded to and connected to the respective pipe ends through the umbrella-shaped compacting member (15) to form the compact joint pipe, and a joint margin is formed inside each welded joint. The build-up (16) (16) was forced to rise.

For this reason, the weld overlay build-up portion, which can be raised inside the joint, causes a large frictional resistance between the welded portion and the fluid flowing through the inside of the pipe, which hinders smooth flow and depending on the fluid. Dust adheres to the built-up portion and contaminates the fluid material, which causes a problem such as corrosion of the built-up portion.

Therefore, in order to eliminate the adverse effects of these built-up portions, the inner built-up portion is shaved to some extent to obtain some effect, but this is also limited in the amount of shaved from the viewpoint of bonding strength. However, the current situation is that smooth, non-resisting distribution has not yet been achieved.

Although it is possible to perform integral molding by a casting method, not only is it necessary to use a large-scale apparatus by a furnace using a fuel such as coke for casting from a molding process peculiar to casting, and sand for casting is also required. Since it is molded by the mold formed in, the inner and outer surfaces of the casting are generally very rough, and in particular, the rough surface on the inside of the pipe becomes a large resistance surface to the flow of the fluid and results in various adverse effects, which are removed. For this reason, a complicated process of smoothly polishing and shaping the narrow inner surface of the pipe is required, resulting in a further increase in cost, which is unsuitable for the integral molding of this kind of compact joint pipe.

[0006]

[Problems to be Solved by the Invention]
In the case of a compact joint pipe made of a tube body having a relatively large wall thickness of m or more, it was inevitable to use a joint pipe having a joint for joining a small diameter pipe and a large diameter pipe by welding. Therefore, the build-up portion of the welding margin formed on the inner surface of the welded and compacted joint pipe hinders the smooth flow of the fluid, and poses various other problems. Various configurations and methods are attempted for this. It has been done, but it was not complete yet. Therefore, an object of the present invention is to realize an integrally molded compression joint pipe having a relatively thick wall and having no joint.

[0007]

In order to achieve the above object, the present invention provides a joint pipe made of a metal having a thick mouthpiece pipe portion and an enlarged mouth pipe portion capable of withstanding relatively strong internal pressure. A squeeze joint pipe formed by integrally squeezing the squeeze mouth pipe portion and the enlarged mouth pipe portion having a relatively thick pipe wall with a wall thickness of 5 mm or more is proposed. A step of forming a base body by pressing a metal plate having a relatively thick wall thickness of 5 mm or more once into a vessel shape, and pressing the center of the bottom portion of the base body into an inwardly convex shape so as to project into a columnar shape inside the bottom portion. A step of forming a bulge, a step of squeezing out the bulge again in an outwardly convex shape to form a bulge that projects into a columnar shape outside the bottom, and then cutting the tip of the bulge to squeeze the mouthpiece As a step of opening as a final step, squeeze molding to adjust the shape of the whole substrate Step a, by press molding through sequentially, and succeeded in realizing a squeeze small joint pipe joint without integrally molded with relatively parts thick pipe wall.

[0008]

[Operation] Due to the high internal pressure applied to the compression joint pipe, especially the high internal pressure at the compression portion where extremely high flow pressure is applied, the pipe wall having a relatively thick wall of 5 mm or more is seamlessly integrated. Can withstand.

By the seamless integrated structure, the inner side surface of the compression joint pipe, to which extremely high fluid pressure is applied, is formed into a flat and round curved surface to reduce the frictional resistance with the fluid substance, and at this portion. The flow of the fluid is smoothed and the components of the fluid are less likely to adhere.

By pressing the metal plate into the container-shaped base, the bottom of the base is once inwardly pressed and the container-shaped curved portion is used as a projection margin so that the metal plate can be pushed in and protruded. Part, and then press-out the ridge again outward to form a columnar bulge on the outside of the bottom to form a protruding metal plate. Enlarged mouth pipe part of the mouth opening part, press-molded integrally into the squeezing mouth pipe part of the bulging part through the squeezing part without joining, by squeezing and shaping by cutting and opening the tip of the bulging part, Produce squeeze fitting tubes.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a compact joint pipe according to the present invention will be described with reference to the drawings. 1 and 2 are views showing a compact joint pipe, (1) is a joint pipe, and an arbitrary metal material is 5 m.
The squeeze mouth tube portion (2) and the enlarged mouth tube portion (3) having a relatively thick wall wall (1a) of m or more are squeezed integrally. For example, by pressing a stainless steel plate having a thickness of 5 mm, the squeeze mouth pipe part (2) and the enlarged mouth pipe part (3) through the reducer-like squeeze part (4) are integrally squeeze-molded and connected by welding or the like. The joint pipe (1) is made of one piece without eyes.

This squeeze joint pipe (1) is a joint pipe used for connecting main pipes of different sizes, which are laid as a device, to each other.
The ends of both main pipes are connected to the mouthpieces (2) and (3) of the squeeze pipe part (2) and the enlarged mouth pipe part (3) of the joint pipe (1) having the same diameter.
Directly butted against a) and joined by welding.

3 to 8 are views sequentially showing steps in a method for manufacturing a compact joint pipe according to the present invention. First, 5 mm.
A plate made of any of the above-mentioned relatively thick metal materials, for example, a stainless steel plate (5) having a thickness of 5 mm is squeezed and molded into a bowl-shaped base (6) by male and female molds (10) and (11), Next, the bulge of the curved portion (7a) around the bottom portion (7) of the base body (6) is used as a protrusion allowance, and the male and female dies (10a) are used so that the center of the bottom portion (7) is once inwardly squeezed into a pillar shape.
(11a) is squeezed to form a columnar protruding portion (8) inside the bottom portion (7) of the substrate (6), and the protruding portion (8) is pulled outward again again to obtain a male-female mold (10b). ) (1
1b) is squeezed to form a columnar bulge (9) outside the bottom of the substrate (6), and the tip (9a) and rim (6a) of the bulge (9) of the substrate (6) are formed. ) Is cut and conditioned, and the entire base body (6) is squeezed and molded by male and female molds (10c) (11c) to complete the squeeze joint pipe (1).

In the above-mentioned embodiment of the manufacturing method, the squeeze molding at room temperature using the stainless steel plate as the metal material is explained.
It is possible to squeeze and mold using any metal material such as copper, brass, aluminum, and other alloys. In the squeezing and molding process into a bowl shape, in addition to the squeeze bowl shape described in the above embodiment, metal Depending on the material or the thickness of the wall, it can be formed into a shallow, arbitrary vessel, for example, a dish-shaped vessel,
Depending on the metal material or the thickness of the wall, compression molding may be performed while heating.

The molding press machine in the above embodiment is
The material is squeezed using a material with a capacity of 120 t / cm ² , but in the squeeze molding process using a metal material and a material with a thicker wall, squeeze molding with a material of about 650 t / cm ² is performed. .. Further, all the compression-molded compact joint pipes are annealed at each designated temperature. For example, in the case of the compacted compact joint pipes compacted using a stainless steel material as in the above embodiment, 9
Annealing treatment at 50 ° C. is applied to condition the pressed metal material. This annealing temperature depends on the quality of the metal being pressed and is 1 for stainless steel.
The treatment is performed at around 000 ° C, about 600 ° C for iron, and about 370 ° C for aluminum.

[0016]

As described above, in the squeeze joint pipe of the present invention, a single metal material is squeezed and molded, and the squeeze pipe portion and the enlarged mouth pipe portion of the pipe wall having a relatively thick wall are formed in the same body. Since the metal structures in all parts of the squeezing pipe part, the squeezing part, and the expanding mouth pipe part are formed seamlessly and homogeneously in the same body, the pressure resistance of the joint pipe part is Ability is very high,
In a compact joint pipe that is not easily damaged by the internal pressure of the fluid, and in which a turbulent flow of the fluid is most likely to occur in the laid pipe, in particular, the build-up due to welding on all inner surfaces Since the tube wall having a smooth curved surface without such protruding ridges is formed, the flow of the fluid is smooth, no excessive internal pressure is generated, and the melt of the fluid is not attached. Therefore, it is possible to completely eliminate the fear that the conventional weld overlay may hinder the smooth flow, and that the adhered melt may erode the pipe wall.

Next, as a manufacturing method, a metal squeeze small joint pipe having a joint pipe mouth portion having a different diameter and formed of a relatively thick pipe wall is produced by integrally pressing a metal material. However, in the manufacturing method of the present invention, the metal plate is first squeezed into a container-shaped base, and the bulge (margin) of the curved portion around the bottom of the base is made by using a slight elasticity. Then, push it inward once to move it inward,
Then, by pulling it outward, it was possible to easily form the squeeze mouth pipe part and to integrally form the subsequent mouth part as an enlarged mouth pipe part.

Therefore, by sequentially press-molding a relatively thick metal plate by a pressing device, it is possible to easily and press-form without impairing the pressure resistance, and moreover, a round small curved surface. This makes it possible to form a seamless, one-piece inner surface for smooth flow, which greatly contributes to lowering the manufacturing cost of the compression joint pipe having a thick wall.

[Brief description of drawings]

FIG. 1 is a perspective view of a compression joint pipe according to the present invention.

FIG. 2 is an enlarged vertical sectional view of a compression joint pipe.

FIG. 3 is a vertical cross-sectional view showing a state before squeezing in one step of the method for manufacturing a squeezing joint tube according to the present invention.

FIG. 4 is a vertical cross-sectional view showing the compression molding of FIG.

FIG. 5 is a vertical cross-sectional view during compression molding showing the next step of the manufacturing method.

FIG. 6 is a vertical cross-sectional view at the time of compression molding showing a further step of the manufacturing method.

FIG. 7 is a vertical cross-sectional view showing the substrate in a cut state in a further step of the manufacturing method.

FIG. 8 is a vertical cross-sectional view during compression molding showing the shaping step of the manufacturing method.

FIG. 9 is a vertical sectional view showing a conventional compression joint pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Squeeze joint pipe 1a Pipe wall 2 Squeezing mouth pipe part 3 Enlarging mouth pipe part 5 Metal plate 6 Base 7 Bottom part 8 Raised part 9 Swelling part 9a Tip part

Claims (3)

[Claims] 1. A joint pipe made of metal having a relatively thick walled mouthpiece portion and an enlarged mouthpiece portion, and a mouthpiece tube portion and an enlarged mouthpiece tube having a relatively thick wall of 5 mm or more. Squeeze joint pipe that is formed by squeezing and molding the part into a seamless one. 2. The tubular body is formed by squeezing a bottom center of a base body formed by squeezing a metal plate into a bulge to form a raised portion.
2. The squeeze joint pipe according to claim 1, wherein the bulging portion formed by pulling out the raised portion again by outward squeezing is cut and opened at the upper end thereof and squeezed and shaped. 3. A method for forming a joint pipe made of a metal having a relatively thick walled squeeze pipe part and an enlarged mouth pipe part, wherein a metal plate having a relatively large wall thickness of 5 mm or more is temporarily used. To form a base body by pressing in a circular shape, to form a ridge projecting inward from the bottom center of the base body to form a columnar protrusion inside the bottom, and again to form a ridge protruding outward. A step of forming a bulging portion that is squeezed and drawn out to the outside of the bottom in a columnar shape;
A method of manufacturing a squeeze joint tube, characterized by comprising the step of squeezing the entire opened base body.