JPH0732473A - Manufacture of tubular flange member - Google Patents

Abstract

PURPOSE:To permit the manufacture of a tubular flange member, employed for the connection of tubes, simply by a method wherein the tip end of a tubular body, made of thermoplastic resin, is heated and softened, then, a form, provided with an inscribing side surface and a projection at the root thereof, is inserted into the tip end to provide a thick part, projected outwardly. CONSTITUTION:A thick part 21 at the tip end of a tubular body 2 made of thermoplastic resin and the neighborhood thereof are dipped into an oil tank of 130-150 deg.C to heat and soften it, then, a form 3 is inserted into the thick part 21 immediately after taking it up from the oil tank. The tip end 31 of the form is entered the thick part 21. The side surface of the form 3 is expanded outwardly and gradually, whereby the thick part 21 is expanded outwardly and gradually in accordance with the insertion of the form 3. Finally, the inner surface of the thick part 21 becomes the same size as a part excluding the thick part 21 since the central part 32 of the form 3 is provided with a size capable of inscribing to the part excluding the thick part 21 and whereby a tubular body, made of thermoplastic resin and provided with the outwardly projected thick part, can be obtained.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a tubular flange member having a flange mounting portion at its tip by processing a thermoplastic resin tubular body.

[0001]

2. Description of the Related Art A flange connection is one of the methods for connecting thermoplastic resin pipes. As a method of connecting pipes with this flange, Japanese Patent Laid-Open No. 58-1376.
As described in Japanese Patent Publication No. 90, the end portion of the thermoplastic resin pipe body is heated and softened, and the end portion is expanded to produce a thermoplastic resin pipe body with a flange. A method of connecting flanges with bolts and nuts is known. Further, as described in JP-A-52-28575, a strip-shaped thermoplastic resin is wound around the outer peripheral surface of a thermoplastic resin tube body to form a flange portion, and the flange portion is cut to form a thermoplastic resin with a flange. A method of manufacturing a flanged tubular body which is a resin tubular body is also known.

[0002]

However, the method for producing a flanged thermoplastic resin pipe body, in which the end portion of the thermoplastic resin pipe body is softened by heating and the end portion is expanded to form a flange, is known. Since the end portion of the pipe-making body is greatly expanded, the distortion of this flange portion becomes large, and this flange portion becomes thin, resulting in a flange having poor mechanical strength. Therefore, when the flanges are connected to each other, there is a problem that the connecting portion is easily broken.
Further, the method for manufacturing a flanged thermoplastic resin tube body in which a strip-shaped thermoplastic resin is rolled up to form a flange portion is inconvenient because the production time is long because a large number of strip-shaped thermoplastic resins are rolled up, and the finished flanged There is a problem that the flange portion of the tubular body is easily peeled off in layers.

The inventor tried to manufacture a tubular body with a flange having a large mechanical strength by an injection molding machine by integrally molding, but a large mold was required, which was expensive and was not practical. Therefore, as a result of repeated research to solve the above problem by improving the above method for processing a thermoplastic resin tube, the present inventor has found that the above problem is that a large flange is directly provided on the thermoplastic resin tube. This causes a problem, therefore, instead of the flanged tube body in which the flange is directly provided on the thermoplastic resin tube body, the flange mounting projecting outward is attached to the end of the thermoplastic resin tube body. By manufacturing a tubular flange member provided with a section, hooking a separately manufactured flange with high mechanical strength to this flange mounting section, connecting the flanges to each other to connect the thermoplastic resin pipe body He realized that he could solve the problem, and in order to achieve this, he invented a method for easily and inexpensively manufacturing the tubular flange member used for this connection. That is, the object of the present invention was made on the basis of the above findings in order to solve the above problems, and a tubular flange member used when connecting thermoplastic resin pipes with a flange can be easily manufactured. It is to provide a method of manufacturing a tubular flange member that can be manufactured.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and is a method for manufacturing a tubular flange member having a flange mounting portion at its tip, which is in a softened state. A mold is inserted into the tip of the thermoplastic resin tube to project the tip outward, and a thermoplastic resin tube having a thick portion protruding outward at the tip is manufactured, This thick portion serves as a flange mounting portion.

According to the present invention, a mold is inserted into the tip portion of the softened thermoplastic resin tube body so that the tip portion protrudes outward, and the tip portion has a thick portion protruding outward. A thermoplastic resin tubular body is manufactured, and a thermoplastic resin tubular body having a shape suitable for producing a thermoplastic resin tubular body having a thick portion with a tip portion protruding outward in such a manner. Alternatively, a suitable mold may be used.

Accordingly, since it is only necessary to select a thermoplastic resin tube or mold having such a suitable shape, there are various methods for producing a thermoplastic resin tube having a thick portion. For example, only a part of the distal end portion of the heat-roughened resin tube body may be expanded to produce the protruding portion, or the entire peripheral surface may be expanded outward, but the latter is preferable. The preferred method is
The tip of the thermoplastic resin tube is heated to soften it, and at the tip of the softened thermoplastic resin tube, the side surface inscribed in the thermoplastic resin tube and the root are set up at a right angle. Insert the mold with the projected part, and press the tip of the thermoplastic resin tube against the projection at the base of the mold, and crush the tip of the thermoplastic resin tube in a lump, It is possible to manufacture a thermoplastic resin tube having a thick portion protruding outward.

As another method, the extrusion speed of the extruder is changed to extrude the thermoplastic resin. Then, the part where the extrusion speed is fast is thin and the part where the extrusion speed is slow is thick, but the outer peripheral surface is regulated by the sizing die, so that the thermoplastic material having a thick part protruding inward on the inner peripheral surface A resin tube can be manufactured. In this way, a thermoplastic resin pipe having a thick portion protruding inwardly on the inner peripheral surface is cut to produce a thermoplastic resin pipe having a thick portion at the tip. The tip of the body is heated to soften it, and the tip is inside the thick part of this thermoplastic resin tube so that the tip enters the thick part, the side surface gradually expands and becomes larger than the thick part. When the mold is inserted, the thick-walled portion is extruded outward, and a thermoplastic resin tube having a thick-walled portion protruding outward at the tip can be manufactured. The thick portion protruding outward may be used as the flange mounting portion as it is, or may be cut into a shape that allows the flange to be easily mounted to be the flange mounting portion.

[0008]

In the method of manufacturing the tubular flange member according to the present invention, the mold is inserted into the tip portion of the softened thermoplastic resin tubular body. Then, depending on the shape and shape of the thermoplastic resin tubular body used at this time, a thermoplastic resin tubular body having a thick portion protruding outward at the tip can be manufactured.

For example, a normal tubular body having a substantially uniform thickness as a thermoplastic resin tubular body, a side surface inscribed in the thermoplastic resin tubular body as a mold, and a projecting portion which is erected at a substantially right angle to the base. Using a mold having and, the tip portion of this thermoplastic resin tube is softened by heating, the mold is inserted into the tip portion of the thermoplastic resin tube body in this softened state, the thermoplastic resin tube The tip of the tubular body is pressed against the protrusion provided at the base of the mold to crush the tip of the thermoplastic resin tubular body. Then, it is possible to manufacture a thermoplastic resin tubular body having a thick portion that protrudes outward at the tip portion.

As another method, a tubular body having a thick portion projecting inward at the tip is used as the thermoplastic resin tubular body, and the tip is an inner side of the thermoplastic resin tubular body as a mold. Use a mold that is large enough to accommodate the protruding thick part, and whose side surface gradually expands and is larger than the thick part. still,
The thermoplastic resin tubular body having the thick portion protruding inward is manufactured as follows. That is, the thermoplastic resin is extruded by changing the extrusion speed of the extruder. Then, the part where the extrusion speed is high is thin and the part where the extrusion speed is slow is thick, but the outer peripheral surface is regulated by the sizing die. A resin tube can be manufactured. After that, the thermoplastic resin pipe body having a thick portion protruding inwardly on the inner peripheral surface is cut to manufacture a thermoplastic resin pipe body having a thick portion at the tip. When the mold is inserted into the thermoplastic resin tube body by softening the tip part of the thermoplastic resin tube body that has a thick part that protrudes inward at this tip, the thickness increases due to the gradually expanding side surface. It is possible to manufacture a thermoplastic resin tubular body having a thick portion that is extruded outward and has a tip portion that protrudes outward.

In this way, the thick portion of the thermoplastic resin tube having the thick portion projecting outward at the tip may be used as it is as the flange mounting portion, or the thick portion projecting outward may be used. May be cut into a shape in which the flange is easily locked to form the flange mounting portion. The tubular flange member manufactured in this way is inserted into the through hole of a separately manufactured flange with a through hole in the center, and the flange is hooked at the flange mounting part at the tip, and the flanges are bolted together. When joined, the thermoplastic resin tube can be connected.

[0012]

Embodiments of the present invention will be described in detail below with reference to the drawings. 1 to 3 show an embodiment of the present invention.
Is an explanatory view showing a cross section of a thermoplastic resin tubular body having a thick portion that protrudes inward, FIG. 2 shows a method for manufacturing a tubular flange member, and (a) shows a state before inserting a mold. Explanatory drawing which shows, (b) is explanatory drawing which shows the state which inserted the type | mold, FIG.
FIG. 6 is an explanatory view showing a state in which a flange is attached to the tubular flange member. 4 to 5 show another embodiment of the present invention, and FIG. 4 shows a method for manufacturing a tubular flange member, in which (a) and (b) heat the tip of the thermoplastic resin tube. And (d) are explanatory views showing a state in which the mold is inserted into the tip of the thermoplastic resin tube body, and (d) is the tip of the thermoplastic resin tube body. 5 is an explanatory view showing a state in which the thick portion is cut, and FIG. 5 is an explanatory view showing a state in which the flange is attached to the tubular flange member.

First, the embodiment shown in FIGS. 1 to 3 will be described. 1 to 3, reference numeral 1 denotes a thermoplastic resin pipe body made of a polyethylene pipe body having a thick portion projecting inwardly on the inner peripheral surface, and 2 projecting inwardly on the inner peripheral surface. This is a thermoplastic resin pipe body having a thick portion 21 projecting inwardly at a tip portion manufactured by cutting the thermoplastic resin pipe body 1 having a thick portion. Reference numeral 3 denotes a steel mold, and the mold 3 has such a size that a tip end 31 thereof enters a thick portion 21 protruding inward of a thermoplastic resin pipe body, a side surface thereof gradually expands, and a central portion 32 thereof has a meat portion. The size is inscribed in a portion other than the thickness 21, and a handle 33 is provided at the base.

Reference numeral 4 denotes a tubular flange member, and the tubular flange member 4 has a flange mounting portion 41 provided at the tip thereof.
And a tubular portion 42. Reference numeral 5 denotes a steel flange, which is composed of a plate-shaped main body 51, a bolt hole 52, and a through hole 53 having a size through which the general portion of the thermoplastic resin tube 2 passes and the flange mounting portion 41 does not pass. Become.

Next, a method for manufacturing and using the tubular flange member will be described. The thermoplastic resin made of polyethylene was extruded by periodically changing the extrusion speed of the extruder to produce a thermoplastic resin tubular body 1 having a thick portion protruding inward as shown in FIG. This thermoplastic resin tubular body 1 is cut along a dotted line a shown in FIG. 1 to form a thermoplastic resin tubular body 2 having a thick portion 21 protruding inward at its tip.
Was manufactured.

The thick-walled portion 21 at the tip of the thermoplastic resin tube 2 and its periphery are immersed in an oil tank at 130 ° C to 150 ° C to heat and soften them, and they are pulled out of the oil tank and immediately softened. The mold 3 is inserted into the thick portion 21 at the tip of the mold. Then, since the tip 31 of the mold 3 is smaller than the thick portion 21 protruding inward, the tip 31 enters the inside. And
Since the side surface of the mold 3 gradually expands, the thick portion 21 gradually expands outward as the mold 3 is inserted.
Finally, since the central portion 32 of the mold 3 is sized to be inscribed in the non-thick portion 21, the inner surface of the thick portion 21 has the same size as the non-thick portion 21, As shown in (b) of (3), the tubular body is made of a thermoplastic resin and has a thick portion protruding outward. The tubular flange member 4 can be manufactured by cutting the thick wall portion of the thermoplastic resin tube projecting outward so as to make the flange easy to attach.

Next, as shown in FIG. 3, the rear end of this tubular flange member 4 is inserted into the through hole 53 of the flange 5, and the flange 5 is moved forward. As shown in FIG. The peripheral edge of the hole 53 is caught by the flange mounting portion 41, and the flange cannot be pulled out forward. The tubular flange member 4 can be connected by attaching the flanges 5 to each other by inserting bolts into the bolt holes 52.

Next, the embodiment shown in FIGS. 4 to 5 will be described. 4 to 5, reference numeral 1a denotes a thermoplastic resin tubular body made of a polyethylene tubular body having substantially the same thickness, and 2a
Is a thermoplastic resin tube having a thick portion at its tip.
Reference numeral 3a is a mold having a side surface of a size inscribed in the thermoplastic resin tube 1a, and the mold 3a has a projecting portion 35 which is erected at a substantially right angle to the root. 3b is a mold 3a
This is another mold different from the above, and this mold 3b is a mold 36 having a side surface inscribed in the thermoplastic resin pipe body 1a, a plate body 37 attached to the root of the mold body 36 to form a protrusion, and an outer mold for adjusting the shape of the tip. And 38.

Reference numeral 4a denotes a tubular flange member, and the tubular flange member 4a has a flange mounting portion 41a and a tubular portion 42.
a. 5a is a steel flange, and this flange 5a comprises a flange main body 51a, a bolt hole 52a, and a through hole 53a.

Next, a method for manufacturing and using the tubular flange member will be described. The tip of the thermoplastic resin tubular body 1a is first immersed in the oil tank 6 at 130 ° C to 150 ° C as shown in Fig. 4A, and after a while,
As shown in (b), it is deeply dipped into the thermoplastic resin tube 1a.
After heating and softening the tip of the thermoplastic resin tube, the mold 3a shown in (c) is inserted into the tip of the softened thermoplastic resin tube 1a immediately after it is pulled out from the oil tank, and the thermoplastic resin tube 1a is inserted. When the tip of the lathe 1a is pressed against the projecting portion 35 and the tip of the thermoplastic resin tubular body 1a is crushed to project outward,
It is possible to manufacture the thermoplastic resin pipe body 2a having a thick portion in which the tip end portion projects outward as shown by the dotted line (e). Next, a tubular flange member 4a is formed by cutting the thick portion at the tip of the thermoplastic resin tube 2a into a shape as shown by the solid line (e).

As another method, a mold 3b as shown in (d) is inserted into the tip of the thermoplastic resin tube 1a having a softened tip to form the thermoplastic resin tube 1a. The tip of 1a is pushed out to the plate body 37 to project outward. Then, since there is the outer die 38 in the outward direction, the tubular flange member 4a is formed by the outer die 38, and the tip end portion is formed in the shape shown by the solid line (e). As described above, when the mold as shown in (d) is used, it is not necessary to cut the thick wall portion, and this thick wall portion is directly attached to the flange mounting portion 41.
It is convenient because it becomes a.

When the rear end of the tubular flange member 4a thus manufactured is inserted into the through hole 53a of the flange 5a and the flange 5a is moved forward, the peripheral edge of the through hole 53a is caught by the flange mounting portion 41a. The flange cannot be pulled out forward. The flanges 5a are bolt holes 52a
When the bolt is inserted and attached to the tubular flange member 4a
Can be connected.

[0023]

As described above, according to the method of manufacturing the tubular flange member of the present invention, the tubular flange member provided with the flange mounting portion can be easily manufactured from the thermoplastic resin tubular body. It is cheaper than manufacturing a resin tube with an injection molding machine. Further, since this tubular flange member is not manufactured by expanding a thermoplastic resin tubular body or winding a strip-shaped thermoplastic resin, when the flange mounting portion is hooked and connected, the machine of this connecting portion It has high strength and can be connected firmly.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention and is an explanatory view showing a cross section of a thermoplastic resin tube having a thick portion protruding inward.

FIG. 2 shows a method for manufacturing a tubular flange member,
(A) is an explanatory view showing a state before the mold is inserted, and (B) is an explanatory view showing a state in which the mold is inserted.

FIG. 3 is an explanatory view showing a state in which a flange is attached to a tubular flange member.

FIG. 4 is a view showing a method for manufacturing a tubular flange member according to another embodiment of the present invention, in which (a) and (b) are explanatory views showing a state in which the tip portion of the thermoplastic resin tubular body is being heated. , (C) and (d) are explanatory views showing a state in which a mold is inserted into the tip of the thermoplastic resin tube body, and (d) shows a state in which the tip part of the thermoplastic resin tube body is cut. FIG.

FIG. 5 is an explanatory view showing a state in which a flange is attached to the tubular flange member.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1,1a Thermoplastic resin tube 2,2a Thermoplastic resin tube 3 having a thick portion at the tip 3,3a, 3b type 4,4a Tubular flange member 5,5a Flange

Claims (2)

[Claims] 1. A method of manufacturing a tubular flange member having a flange mounting portion at its tip, wherein the tip of a thermoplastic resin tube body is heated to soften the thermoplastic resin tube in this softened state. At the tip of the body, insert a mold that has a side surface that is inscribed in the thermoplastic resin tube and a protrusion that is raised at a substantially right angle to the base, and use the tip of the thermoplastic resin tube as the base of the mold. By pressing against a certain protrusion, the tip of the thermoplastic resin tube is crushed in a lump, and a thermoplastic resin tube having a thick portion protruding outward at the tip is manufactured, and this thick portion is A method for manufacturing a tubular flange member, which comprises a flange mounting portion. 2. A method for manufacturing a tubular flange member having a flange mounting portion at its tip, wherein a thermoplastic resin is extruded by changing an extrusion speed of an extruder and is extruded inward on an inner peripheral surface. A thermoplastic resin tube having a thick portion is manufactured, and the thermoplastic resin tube is cut to produce a thermoplastic resin tube having an inwardly projecting thick portion at the tip end. The thick part of the thermoplastic resin tube is heated to soften it, and the tip is inside the thick part of the softened thermoplastic resin tube, and the side surface gradually expands. And insert a mold that is larger than the thick part to push out the thick part that protrudes inward, and manufacture the thermoplastic resin tube with the thick part that protrudes outward at the tip. Of the tubular flange member characterized by using this thick portion as a flange mounting portion. Production method. [0001]