JPH07290589A - Manufacture of flanged internally resin lined branch pipe - Google Patents

Abstract

PURPOSE:To realize the easy provision of resin lining layer in a short period of time at low cost even in a multi-branch pipe, in which the position, number, diameter or the like of branch pipes are not standardized, by a method wherein resin pipe is inserted in pipe part and diametrically expanded so as to bring the resin pipe into close contact with the inner wall surface of the pipe part. CONSTITUTION:Synthetic resin pipe is inserted in the main pipe 11 of a branch pipe body. At the insertion, adhesive is applied in advance onto the inner wall surface of the branch pipe body 1 or onto the outer wall surface of the synthetic resin pipe. The synthetic resin pipe is diametrically expanded by the known method and flanged so as to form a pipe part resin lining layer 51, which ranges from the inner surface of the pipe part 11a of the main pipe 11 to the flange surfaces 11b and 11b of the main pipe, and flange part lining layers 52 and 52. After that, a supporting pipe 3 as supporting member is fittingly installed within the pipe part resin lining layer 51 and, at the same time, molds 4 are set in branch pipes 12 and 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flanged inner surface resin lined branch pipe in which a resin running layer is formed from the inner surface of the main pipe to the pipe end flange surface and the inner surface of the branch pipe connected to the main pipe and the flange surface thereof. It relates to a manufacturing method.

[0002]

2. Description of the Related Art A steel pipe with a flange or a pipe joint which is used as a pipe material in which a flange is integrally provided at the end of a steel pipe body has a pipe end flange from the inner surface of the steel pipe body for the purpose of enhancing its corrosion resistance. Some are lined with resin across the surface. As a method for manufacturing a flanged inner surface resin-lined branch pipe such as a header pipe or cheese, which is one type of this kind of flanged inner surface resin-lined pipe joint, for example, one described in Japanese Patent Publication No. 4-19015 is known. ing.

According to this manufacturing method, resin pipes are inserted into the main pipe and the branch pipe of the branch pipe main body and expanded to temporarily bond them to the inner surfaces, respectively, and then both resin pipes are heated and softened at predetermined pressures. At the same time, pressure is applied from the inside, and then a hole is punched in the portion of the main pipe that faces the branch pipe of the resin pipe, and the peripheral edge of this hole and the edge of the resin pipe of the branch pipe are welded together, thereby branching the resin lining layer. It is designed to be formed from the inner surface of the main body to each flange surface.

[0004]

However, in the case of a standard type branch pipe such as cheese, there is no problem even with the above method, but in the case of a multi-branch pipe called a header pipe, the position of the branch pipe is It is very difficult to pressurize all the resin pipes simultaneously with a predetermined pressure from the inside because the number, diameter, etc. are not determined.

Further, there is a problem that it takes a long processing time because the lining of each branch pipe portion requires two steps of expanding the diameter and bending back. In view of such circumstances, the present invention provides a resin lining layer in a short time simply and at low cost even in the case of a multi-branch pipe in which the position, number or diameter of the branch pipe is not standardized. It is an object of the present invention to provide a method for manufacturing a flanged inner surface resin-lined branch pipe.

[0006]

In order to achieve such an object, a method of manufacturing a flanged inner surface resin lined branch pipe according to the present invention is provided with a flanged branch pipe from a desired position of a main pipe having flanges at both ends. In the method of manufacturing a flanged inner surface resin-lined branch pipe in which a resin lining layer is provided over the inner surface and the flange surface of the metal branch pipe body that extends, the resin pipe is inserted into the pipe portion of the main pipe, and the resin pipe is A pipe running process that expands the diameter of the outer wall of the resin pipe to adhere to the inner wall surface of the pipe, a main pipe flange surface lining process that forms a resin lining layer on the flange face of the main pipe, and a molding die that forms a cavity for forming the lining layer Set in a pipe, injection-mold resin in this cavity, and apply the branch pipe lining layer to the inner surface of the branch pipe and the flange surface of the branch pipe. A branch pipe lining step of forming, a perforating step of providing a hole communicating with the branch pipe in a portion of the expanded resin pipe facing the branch pipe, and a peripheral edge of the hole and the edge of the branch pipe lining layer are fused. Alternatively, it is configured to include a joining step of welding.

In the above structure, the material of the branch pipe body is
Usually, steel is used, but other metals such as castings and stainless steel may be used. The resin to be the lining layer is not particularly limited as long as it can be injection-molded, but for example, a resin such as vinyl chloride resin, chlorinated vinyl chloride resin, polyethylene, polybutene, polyvinylidene fluoride (PVDF), polyphenylene sulfide (PPS), etc. Is mentioned.

Further, in manufacturing, an adhesive is usually used from the inner surface of the branch pipe main body to each pipe end flange surface, but the present invention is also applicable to a loose lining which does not use such an adhesive. When an adhesive is used, a hot-melt adhesive is usually used, but a rubber-based solvent-based adhesive can also be used. In the main pipe flange surface lining process, a part of the resin pipe used in the pipe part lining process of the main pipe is projected from the end of the main pipe, and the protruding portion is flanged or is formed by injection molding. A surface lining layer can be formed. When the main pipe flange surface lining layer is formed by injection molding, the resin pipe should be shorter than the pipe portion of the main pipe.

The branch pipe lining step is preferably carried out after an annular or tubular support member that is in close contact with the inner wall surface of the resin pipe is set in advance at the portion of the resin pipe facing the branch pipe portion. The piercing process may be performed before or after the branch pipe lining process, but is preferably performed after the branch pipe lining process in consideration of the work of setting the support member and the ease of structure.

[0010]

According to the above structure, the main pipe has a resin pipe inserted into the pipe, and the diameter of the resin pipe is expanded so as to be in close contact with the inner wall surface of the pipe. The tube portion resin lining layer can be formed with a thickness. Also, for the branch pipe lining layer, set a molding die suitable for the diameter of each branch pipe to each branch pipe,
It can be formed only by injection molding individually.

Then, a hole is formed in a portion of the resin pipe that faces the branch pipe, and the peripheral edge of the hole and the end edge of the branch pipe lining layer are fused or welded to form the branch pipe lining layer and the main pipe lining layer. Firmly integrated.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings showing the embodiments thereof. 1 to 4 show one embodiment of a method for manufacturing a flanged inner surface resin lined branch pipe according to the present invention in the order of steps. This manufacturing method will be described below in the order of steps.

As shown in FIG. 1, the synthetic resin pipe 2 is inserted into the main pipe 11 of the branch pipe body 1. Before insertion, an adhesive is applied to the inner wall surface of the branch pipe body 1 or the outer wall surface of the synthetic resin pipe 2 in advance. As shown in FIG. 2, the diameter of the synthetic resin pipe 2 is expanded by a known method, and the collar portion is subjected to collaring to make the pipe portion 11 a of the main pipe 11 a.
Pipe portion resin lining layer 51 and flange portion lining layer 5 extending from the inner surface to the flange surfaces 11b, 11b of the main pipe
2, 52 are formed.

As shown in FIG. 3, the support pipe 3 as a support member is fitted inside the pipe portion resin lining layer 51, and the molding die 4 is set on the branch pipes 12, 12. By setting the molding die 4, the cavity 4 a for forming the resin lining layer is formed along the inner wall surface and the flange surface of the molding die 4 and the branch pipe 12. The outer wall surface of the support pipe 3 is in close contact with the inner surface of the pipe portion resin lining layer 51.

On the other hand, as shown in FIG. 3, the molding die 4 is composed of a flange die 41 and an inner rod die 42 which is fitted into the flange die 41 so as to be movable back and forth in the main pipe direction. The inner rod mold 42 is formed with a sprue 42a and a runner 42b. The resin is injected into the cavity 41 from an injection machine (not shown) through the sprue 42a and the runner 42b,
As shown in (a), the branch pipe part lining layer 53 is formed from the inner surface of the branch pipe 12 to the flange surface.

As shown in FIG. 4B, a hole 6 is formed in a portion of the pipe resin lining layer 51 facing the branch pipe 12. By heat-sealing the peripheral edge portion 51a of the hole 6 and the end edge portion 53a of the branch pipe lining layer 53 from the inner surface to the flange surface of the main pipe 11 and the branch pipe 12 of the branch pipe body 1 as shown in FIG. It is possible to obtain the flanged inner surface resin-lined branch pipe 7 in which 5 is formed.

The invention is not limited to the embodiments described above.
For example, in the above embodiment, two branch pipes 12 are provided, but three or more branch pipes 12 or one branch pipe 12 may be provided. Further, various lengths and diameters of the pipe portion of the branch pipe can be selected. Further, in the above-mentioned embodiment, the flange surface lining layer 52 of the main pipe 11 is formed by turning back the synthetic resin pipe 2, but by inserting a synthetic resin pipe slightly shorter than the main pipe 11 into the main pipe 11, After forming only the pipe portion resin lining layer by expanding the diameter, the flange surface lining layer of the main pipe 11 is similarly formed by injection molding, and the pipe portion resin lining layer and the flange surface lining layer of the main pipe 11 are fused or welded. You may make it join and integrate by.

[0018]

EFFECTS OF THE INVENTION The method for producing a flanged inner surface resin lined branch pipe according to the present invention is configured as described above, and thus a multi-branch pipe in which the position, number or diameter of branch pipes is not standardized is used. Even if there is, the resin lining layer can be provided easily in a short time and at low cost.

[Brief description of drawings]

FIG. 1 is an explanatory view illustrating one embodiment of a method for manufacturing a flanged inner surface resin-lined branch pipe according to the present invention, and a pipe portion lining step thereof.

FIG. 2 is an explanatory view illustrating one embodiment of a method for manufacturing a flanged inner surface resin lined branch pipe according to the present invention, and explaining a main pipe flange surface lining step thereof.

FIG. 3 is an explanatory view illustrating one embodiment of a method for manufacturing a flanged inner surface resin-lined branch pipe according to the present invention, and explaining a branch pipe lining step thereof.

FIG. 4 is an explanatory view illustrating one embodiment of a method for manufacturing a flanged inner surface resin-lined branch pipe according to the present invention, and explaining a piercing step and a joining step thereof.

FIG. 5 is a cross-sectional view of a flanged inner surface resin lining branch pipe obtained through the steps shown in FIGS.

[Explanation of symbols]

 1 Branch Pipe Main Body 2 Synthetic Resin Pipe 4 Mold 4a Cavity 5 Resin Lining Layer 6 Hole 7 Flange Inner Surface Resin Lining Branch Pipe 11 Main Pipe 11b Flange 12 Branch Pipe 51 Pipe Section Resin Lining Layer 51a Hole 6 Perimeter 52 Flange Face Resin Lining layer 53 Branch pipe lining layer 53a Edge portion of branch pipe lining layer 53

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B29C 65/02 7639-4F 69/00 2126-4F // B29L 23:00

Claims (1)

[Claims] 1. A flanged inner surface resin-lined branch pipe in which a resin lining layer is provided on an inner surface and a flange surface of a metal branch pipe body in which a branch pipe with a flange extends from a desired position of a main pipe having flanges at both ends. In the manufacturing method, a resin pipe is inserted into the pipe portion of the main pipe, a pipe running step of expanding the diameter of the resin pipe to bring the outer wall surface of the resin pipe into close contact with the inner wall surface of the pipe portion, and forming a resin lining layer on the flange surface of the main pipe. Main pipe flange surface lining process, a molding die that forms a cavity for forming the lining layer is set in the branch pipe, and resin is injection-molded in this cavity to cover the inner surface of the branch pipe and the flange surface of the branch pipe. A branch pipe lining step of forming a layer, a perforating step of providing a hole communicating with the branch pipe in a portion of the expanded resin pipe facing the branch pipe,
A method for producing a flanged inner surface resin-lined branch pipe, comprising a joining step of fusing or welding the peripheral edge of the hole and the edge of the branch pipe lining layer.