JPH03169533A - Manufacture of thermoplastic resin pipe provided with flange and manufacture of resin composite pipe provided with flange for which that manufacture is used - Google Patents

Abstract

PURPOSE:To obtain a thermosetting resin pipe provided with a flange, whose bending strength and shearing strength of a flange joining part are both high, by a method wherein molten resin is piled up on an angular corner between the outside of a pipe and the outside of the flange. CONSTITUTION:A pipe body 1 is supported coaxially with a flange member 2.. An end surface 11 of the pipe body 1 and a joint surface 23 of the flange member 2 are molten by heating them. A surface temperature range of 200-220 deg.C and heating time range of 60-90 seconds are preferable as a heating condition at this time. Immediately after the heating, the end surface 11 of the pipe body 1 and joint surface 23 of the flange member 2 are confronted with each other, a load is applied to them in an axial direction and they are pushed against each other. The molten resin is piled up on an angular corner between the outside of the pipe body and the outside of a surplus thickness part 22 of the flange member 2. Consequently, the angular corner is reinforced and the flange member 2 and pipe body 1 are joined firmly to each other. Although the molten resin is piled up also on the inside of the pipe body 1, since a chamfering 12 is provided on the pipe body 1 and a chamfering 24 is provided on a flange member 2, the molten resin is not ejected through inner wall surface of the thermoplastic resin pipe 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a flanged thermoplastic resin pipe with excellent bending strength and shear strength, and a method for producing a flanged resin composite incense.

2. Prior Art) The following two methods are known as conventional methods for manufacturing flanged thermoplastic resin pipes.

One method is to weld a plate-shaped flange member made of thermoplastic resin to the end of a thermoplastic resin pipe.

The other method is to butt the flange-shaped product, which has an approximately L-shaped cross section by forming a short pipe member having the same inner and outer diameters as the thermoplastic resin pipe and a flange member, against the end face of the thermoplastic resin pipe. This is a method of fusing. Furthermore, the following two methods are known as conventional methods for manufacturing flanged resin composite pipes.

One method is to coat the outer surface of the flanged thermoplastic resin pipe and the outer surface of the flange of the flanged thermoplastic resin pipe obtained by the above-described method for producing a flanged thermoplastic resin pipe with a fiber-reinforced thermosetting resin.

The other method is disclosed in Japanese Patent Application Laid-Open No. 14920/1983. This method involves inserting a master shape wound with glass fiber into the cavity of a mold that is divided into an upper mold and a lower mold, and then injecting thermosetting resin through the gate to connect the cavity surface and the master mold. A thermosetting resin is press-fitted into the gap to impregnate and harden the thermosetting resin into the original glass fiber.

(Problems to be Solved by the Invention) However, the conventional method for manufacturing a flanged thermoplastic resin pipe has the following problems.

In the method of welding a plate-shaped flange member made of thermoplastic resin to a thermoplastic resin pipe, since the welding is used for joining, the resulting pipe has low bending strength and shear strength, and is prone to cracks. . In addition, there are many variations in quality, and manufacturing is labor-intensive.

In addition, in the method of fusing a flange shaped product to a thermoplastic resin pipe, there are problems in that when a flange or shaped product that has been machined is used, it takes more man-hours to manufacture and increases the manufacturing cost. there were. In addition, when a flange or shaped product made of an injection molding type is used, a mold for the injection molding is required, so that it cannot be used for large diameter products.

On the other hand, in the conventional method for manufacturing flanged resin composite pipes, the outer surface of the flanged thermoplastic resin pipe and the outer surface of the flange are coated with fiber-reinforced thermosetting resin. There were similar problems with the method. Furthermore, the adhesiveness of the fiber-reinforced thermosetting resin was not good at the corner between the outer surface of the tube and the outer surface of the flange because it was difficult to perform surface treatment.

In addition, in the method disclosed in JP-A-61-14920, it is necessary to obtain the original shape from vinyl chloride resin or the like by machining or injection molding. It was not possible to manufacture the tube.

The first aspect of the present invention has been made in order to solve the problems in the above-mentioned conventional method for manufacturing flanged thermoplastic resin pipes. In other words, the present invention aims to provide a method for manufacturing flanged thermoplastic resin pipes with high mechanical strength easily and at low cost, and that can also be used for pipes with large diameters.

The second aspect of the present invention has been made in order to solve the problems of the above-described conventional method for manufacturing a flanged resin composite pipe.

In other words, the objective is to easily and at low cost produce a flanged resin composite tube that can be used with large diameters and has high mechanical strength.

(Means for Solving the Problems) In order to achieve the above object, a method for manufacturing a flanged thermoplastic resin pipe according to claim 1 provides a method for manufacturing a flanged thermoplastic resin pipe, and a thermoplastic resin pipe having a diameter substantially equal to the inner diameter of the thermoplastic resin pipe. A flange member made of a thermoplastic resin having a through hole with an inner diameter of 100 mm and an extra wall around one opening of the through hole is prepared, and one end surface of the thermoplastic resin pipe and the flange member are provided. This is a method of heating and melting the joining surface on the side of the extra wall of the through hole, and then joining the end surface of the thermoplastic resin pipe and the joining surface of the flange member against each other.

In addition, the method for manufacturing a flanged resin composite pipe according to claim 2 includes coating the outer surface of the flanged thermoplastic resin pipe and the outer surface of the flange of the flanged thermoplastic resin pipe manufactured by the manufacturing method according to claim 1 with a fiber-reinforced thermosetting resin. This is the way to do it.

(Function) The method for manufacturing a flanged thermoplastic resin pipe according to claim 1 includes preparing a thermoplastic resin pipe and a flange member made of thermoplastic resin, and removing the excess wall of the end face of the thermoplastic resin pipe and the through hole of the flange member. The joint surface on the side is heated and melted, and the end surface and the joint surface are butted and joined. As a result, the molten resin bulges at the corner between the outer surface of the tube and the outer surface of the flange, and the strength of this portion is strengthened.

The method for manufacturing a flanged resin composite pipe according to claim 2 is characterized in that the flanged thermoplastic resin pipe obtained by the method for manufacturing a flanged thermoplastic resin pipe according to claim 1 is provided with fiber-reinforced thermosetting on the outer surface of the flanged thermoplastic resin pipe and the outer surface of the flange. coated with a synthetic resin. As a result, the molten resin rises at the corner between the outer surface of the tube and the outer surface of the flange, strengthening the strength of this area and
Since the corners are raised, this part can be surface-treated uniformly. Therefore, the fiber-reinforced thermosetting resin is uniformly coated on the outer surface of the tube and the outer surface of the flange.

(Example) [First Example] Hereinafter, an example according to claim 1 will be described with reference to the drawings.

FIG. 1 is a sectional view showing a thermoplastic resin pipe (hereinafter referred to as "pipe body") 1 and a flange member 2 used in this embodiment.

The tube 1 is made of thermoplastic resin such as vinyl chloride resin. One end surface 11 of the tube l is preferably beveled at an angle of 45° to the outer surface.

In addition, the corner between the end surface 11 and the inner surface of the tube body l is chamfered l2.
administer.

The flange member 2 is made of a circular plate made of thermoplastic resin such as vinyl chloride resin. A through hole 21 having approximately the same size as the inner diameter of the tube body 1 is provided in the center of the flange member 2,
The peripheral edge of one opening of the through hole 21 preferably has a thickness of 0.
．． An extra wall portion 22 of about 5 to 1 m++ is provided protrudingly. The peripheral edge of the through-hole 2l on the side of the extra-thickness portion 22 has a joint surface that preferably has a beveled surface at an angle of 45° to the axis of the through-hole 2l and corresponds to the end surface 11 of the tube body 1. 23 will be provided.

Further, a chamfer 24 is provided at the corner between the joint surface 23 and the inner surface of the through hole 21.

Then, the tube body 1 is supported coaxially with respect to the flange member 2. The end surface 11 of the tubular body 1 and the joint surface 23 of the flange member 2 are heated and melted. The heating conditions at this time are:
Desirably, the surface temperature is in the range of 200 to 220°C and the heating time is in the range of 60 to 90 seconds.

Immediately after heating, the end surface 11 of the tubular body 1 and the joint surface 23 of the flange member 2 are abutted against each other and pressed against each other by applying a load in the axial direction. The load at this time is, for example, 15 to 25 kg/
c+J is desirable. Then, the end surface 1l of the tube 1 and the joint surface 23 of the flange member 2 are fused to each other, and the molten resin is applied to the corner between the outer surface of the tube 1 and the outer surface of the extra wall portion 22 of the flange member 2. It rises in the corner. As a result, as shown in FIG. 2, the corner is reinforced and the flange member 2
and tube body l are firmly joined. In addition, the molten resin also rises on the inner surface of the tube 1, but the tube 1 has a chamfer 12.
However, since the flange member 2 is provided with the chamfer 24, it does not protrude beyond the inner wall surface of the thermoplastic resin pipe 1. Therefore, a flanged thermoplastic resin pipe with low fluid resistance can be obtained.

Note that the end surface 11 of the thermoplastic resin pipe 1 and the flange member 2
The groove angle of the joint surface 23 can be arbitrarily selected within the range of 40 to 90''.
In addition to the shapes of the flange member 2, shapes as shown in FIGS. 3 to 5 are also suitably used in the present invention.

In the one shown in FIG. 3, the shape of the tube body 1 is the same as that of the above embodiment, and the shape of the flange member 2 is the same as that of the above embodiment except that the outer circumferential surface of the extra wall portion 22 is tapered. It is the same as that of

In the one shown in FIG. 4, the end surface 1l of the tube body 1 and the joint surface 23 of the flange member 2 are perpendicular to the axis, and the outer circumferential surface of the extra wall portion 22 of the flange member 2 is tapered. It is the same as that of the above-mentioned example except for.

The example shown in FIG. 5 is the same as the example shown in FIG. 4 except that the outer circumferential surface of the extra wall portion 22 of the flange member 2 is parallel to its axis.

[Second example]

Next, an embodiment according to claim 2 will be described with reference to the drawings.

In this example, first, mechanical surface treatment such as sanding or chemical surface treatment such as primer is applied to the outer surface of the flanged thermoplastic resin tube and the outer surface of the flange obtained by the manufacturing method according to claim 1. .

In this method, as shown in FIG. 6, a fiber-reinforced thermosetting resin G is coated. This fiber-reinforced thermosetting resin G is preferably a glass fiber-reinforced thermosetting resin.

At this time, because the resin is raised at the corner between the outer surface of the flanged thermoplastic resin pipe and the outer surface of the flange,
The corner can be easily subjected to the mechanical or chemical surface treatment described above. Therefore, the angle also has a high affinity with the fiber-reinforced thermosetting resin G, and the outer surface of the tube and the outer surface of the flange can be uniformly coated with the fiber-reinforced thermosetting resin G.

An example of a method for coating the outer surface of the flanged thermoplastic resin pipe according to claim 1 with the fiber-reinforced thermosetting resin G will be described below.

First, a mixture of an unsaturated polyester resin, an isocyanate compound, a small amount of methyl ethyl ketone peroxide as a hardening agent, and a small amount of cobalt naphthenate as an accelerator is mixed with a glass fiber such as roving cloth. A material impregnated with a thermosetting resin such as polyester resin, acrylic resin, or epoxy resin is prepared.

Next, the liquid mixture is applied to the outer surface of the flanged thermoplastic resin pipe of Example 1 and the outer surface of the flange. Then, before the applied liquid mixture is cured, glass fibers impregnated with a thermosetting resin are laminated. Finally, heat treatment is performed to harden the thermosetting resin.

゛Next, a comparative test of breaking force, shear strength, and breaking bending strength of the flanged thermoplastic resin pipe obtained by the manufacturing method of claim 1 and the flanged thermoplastic resin pipe obtained by the conventional method. I did it.

Further, a similar comparative test was conducted between the flanged resin composite tube obtained by the manufacturing method of claim 2 and the flanged resin composite tube obtained by the conventional method.

The specimens and test methods used in this comparative test are as follows.

In addition, specimen (1) is a cut piece of a flanged thermoplastic resin pipe obtained by the manufacturing method of claim 1, and specimen (2) and specimen (2) are flanged thermoplastic resin pipes obtained by a conventional manufacturing method. The cut piece is shown. In addition, specimen (2) is a cut piece of a flanged resin composite pipe obtained by the manufacturing method of claim 2, and specimen V and specimen (2) are cut pieces of a flanged resin composite pipe obtained by the conventional manufacturing method. A piece is shown.

[Specimen]

Specimens I to (2) are L-shaped specimens made of vinyl chloride resin. Specimens (1) to (2) were further coated with a glass fiber reinforced thermosetting resin G having a thickness of 4.51 wl on the inner surface of the L-shape, and then cured. Each of the specimens 1 to 2 will be described in detail below.

<Specimen I> A first plate piece A (thickness 14 m, width 30 n) with one end face having a 45° bevel face, and one end face having a 45″ bevel face and the Second plate piece B (same size as first plate piece A) with extra thickness provided along the upper line of the end surface.
and were created.

Then, as shown in FIG. 7, the end face of the first plate piece A and the end face of the second plate piece B were heated and immediately abutted against each other and fused to form a specimen I.

Specimen ■〉 A first plate C (thickness 14 mm, width 30.5 m) with a 5-inch chamfer on the corner of one end surface and the top surface, and one end surface, the top surface, and the bottom surface, respectively. 511I in the corner of
The second plate piece D (first plate piece C) is provided with a chamfer, respectively.
Same dimensions as. ) was created.

Then, as shown in FIG. 8, the end surface of the second plate piece D is brought into contact with the chamfered side edge of the upper surface of the first plate piece C, and molten vinyl chloride resin J is heaped up on each chamfer. , the first plate piece C and the second plate piece D are joined to form a specimen ■
was created.

<Specimen ■> First plate piece E (thickness 14 m) with one end surface as the joint surface
m, width 30 mm) and a second plate piece F (same size as the first plate piece E) whose one end surface was a joint surface and bent in an L shape near this joint surface. .

Next, as shown in FIG. 9, the joint surfaces of the first plate piece E and the second plate piece F were respectively heated and then butted and fused together to prepare a specimen (2).

<Specimen ■> As shown in Figure 10, the specimen ■ has a width of 30.5 mm.
Other than that, it has the same shape as specimen I, and this I
The glass fiber reinforced thermosetting resin G having a thickness of 4.5u+ was uniformly coated on the inner surface of the shape of the letter , and then cured.

<Specimen V> As shown in Fig. 11, the specimen ■ has the same shape as the specimen ■ except that the width is 32.5 m, and the inner surface of this L-shape has a thickness of 4. It was produced by uniformly coating and curing .5 mm of glass fiber reinforced thermosetting resin G.

<Specimen ■> As shown in Fig. 12, the specimen ■ has the same shape as the specimen ■ except that the width is 32 mm, and the inner surface of this L-shape has a thickness of 4 mm. It was produced by uniformly coating and curing 5 pieces of glass fiber reinforced thermosetting resin G.

〔Test method〕

At an environmental temperature of 20°C, for the above specimens I to ■,
As shown in FIGS. 7 to 12, a vertical stress P was applied upward from the bottom surface at a point 5511, and the breaking force, shear strength, and bending strength at break were measured. Table 1 shows a comparison of specimens I to ■.
Table 2 shows a comparison for ~■.

Table 2 From the above results, although the breaking force, shear strength, and bending strength at break of Specimen I are not as good as Specimen ■, they are significantly improved compared to Specimen ■. However, the specimen (2) is made by fusion-bonding a tube and a flange-shaped product. In order to manufacture this flange molded product, it is necessary to use an injection mold or to cut it out. Therefore, considering the increased manufacturing cost, the method for manufacturing a flanged thermoplastic resin pipe according to claim 1 satisfies both economic and performance aspects.

Similarly, the breaking force, shear strength, and bending strength at break of specimen (2) are significantly improved compared to specimen (V), although they are not as good as those of specimen (2). For the same reason as above, the method for manufacturing a flanged resin composite pipe according to claim 2 satisfies both economic and performance aspects.

In addition, the method for manufacturing a flanged thermoplastic resin pipe and a flanged resin composite pipe according to the present invention includes the steps shown in FIGS. 13 and 14.
A fusing device 3 as shown in the figure is preferably used.

The fusing device 3 includes a heating heater 31 and a flange fixing part 32.
, tube body clamp 33.33, and slide shaft 34.34
, a clamp moving device 35 , and a clamp moving lever 36
, a heater moving device 37 , a main body 38 , and a striker 39 . The slide axes 34.34 are installed horizontally on the main body 38 and parallel to each other. The flange fixing portion 32 is slidably provided on the slide shaft 34.34, and is further supported at a proper position on the slide shaft 34.34 by a spring (not shown) or the like. Further, the flange fixing portion 32 supports the flange member 2 perpendicularly to the slide shafts 34, 34. The tube body clamp 33.33 supports the tube body l coaxially with respect to the flange member 2 and parallel to the slide shafts 34, 34, and is moved by the clamp movement device 35 and the clamp movement lever 36 to the slide shafts 34, 34. 34.

The heater 31 is installed coaxially with the tube body 1 and the flange member 2, and then installed on the end surface 11 of the tube body 1 and the flange member 2.
The joint surface 23 of the is heated. The heater 31 is made removable from the same axis of the tube body 1 and the flange member 2 by means of a heater moving device 37 that is slidably attached to the slide shafts 34 and 34.

In the fusion device 3 configured in this way, the tube body 1
are fixed to the tube body clamps 33, 33, and the flange member 2 is fixed to the flange fixing part 32. Then, after installing the heater 31 coaxially with the tube body l and the flange member 2, operate the clamp moving lever 36 to move the tube body l fixed to the tube body clamps 33 and 33 toward the flange member 2. Move to. Then, the end surface 1l of the tubular body 1 comes into contact with the heater 3l, and when it is moved further, the heater 31 comes into contact with the joint surface 23 of the flange member 2, and finally the flange fixing part 32 comes into contact with the stopper 39 and stops.

In this state, the tube body 1 is heated by the heater 31.
and the joint surface 23 of the flange member 2 are heated. After heating is completed, the clamp moving lever 36 is returned to its original position, and the heater 31 is moved from the same axis of the tube body 1 and the flange member 2. JJ.

Immediately operate the clamp moving lever 36 again to move the tube body 1.
The end surface 11 of the flange member 2 is brought into contact with the joint surface 23 of the flange member 2, and a load is applied in the axial direction. Then, the end surface l1 and the joining surface 23 are fused to each other.

(Effects of the Invention) As explained above, according to the method for manufacturing a flanged thermoplastic resin pipe according to claim 1, the molten resin bulges at the corner between the outer surface of the tube and the outer surface of the flange, so that
A flanged thermosetting resin pipe with high bending strength and high shear strength at the flange joint can be obtained.

Moreover, since it is only necessary to prepare a thermoplastic resin pipe and a flange member provided with an extra wall portion, a flanged thermosetting resin pipe can be manufactured easily and at low cost. Moreover, since no mold or the like is required, it can be used with large-diameter products.

The method for manufacturing a flanged resin composite pipe according to claim 2 also provides the same effects as the method for manufacturing a flanged thermoplastic resin pipe according to claim 1. In addition, since the molten resin fills the corner between the outer surface of the tube and the outer surface of the flange, the surface treatment is uniform on the outer surface of the tube and the outer surface of the flange, and the fiber-reinforced thermosetting resin is uniformly coated. . Therefore, a flanged resin composite pipe with high strength can be obtained.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIGS. 1 to 5 are partially cutaway side views showing a pipe body and a flange member used in the method for manufacturing a flanged thermoplastic resin pipe according to claim 1, and FIG. 7 is a partially cutaway side view of a flanged resin composite pipe produced by the method for manufacturing a flanged resin composite pipe according to claim 2, FIG. 7 is a perspective view showing specimen ■, and FIG. 8 shows specimen ■. A perspective view, FIG. 9 is a perspective view showing the specimen ■, FIG. 10 is a perspective view showing the specimen ■,
Figure 11 is a perspective view of specimen V, and Figure 12 is specimen V.
13 is a plan view of the fusion device, and FIG. 14 is a side view of the same. 1 2...Thermoplastic resin pipe 11...End face...Flange member 2l...Through hole 22...Extra wall portion 23...Joint surface

Claims (1)

[Scope of Claims] 1) A thermoplastic resin pipe, a through hole having an inner diameter approximately the same as the inner diameter of the thermoplastic resin pipe, and an extra wall portion at the periphery of one opening of the through hole. A flange member made of thermoplastic resin is prepared, and one end face of the thermoplastic resin pipe and the joining face on the side of the excess wall of the through hole of the flange member are heated and melted, and the end face of the thermoplastic resin pipe and this flange are heated and melted. A method for manufacturing a flanged thermoplastic resin pipe, characterized in that the joining surfaces of the members are butted and joined. 2) A method for producing a flanged resin composite tube, which comprises coating the outer surface of the flanged thermoplastic resin tube and the outer surface of the flange produced by the method according to claim 1 with a fiber-reinforced thermosetting resin.