JPH0459233A - Manufacture of reinforced pipe and reinforced pipe - Google Patents

Abstract

PURPOSE:To increase specific strength by mixing a large amount of ceramic powder in resin particles so that the powder is contained densely in such a manner that the particles are almost in contact with the powder when the resin is molten and allowing the resin to melt thermally under pressure to fill space in the ceramic powder. CONSTITUTION:A large amount of ceramic 3 powder is mixed with resin 2 particles so that the powder is contained densely to permit the particles to come into contact with the powder when the resin 2 is molten. The resin 2 particles mixed with the ceramic 3 powder in a mixing process are sandwiched in a molding die 5 and thermally pressed P. In other words, the mixture is once formed into a flat and hard reinforcing material 1 using a hot press. Then the molded flat and hard reinforcing material 1 is cut to each specified length and is held between an inner mold fixture 61 and an outer mold fixture 62. After that, the molded product is thermally pressed P, then is formed into a cylindrical body with an appropriate thickness corresponding to the internal surface of a pipe and cured.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method for manufacturing a reinforced pipe and a reinforced pipe. That is, the present invention relates to a method for manufacturing a reinforced pipe and a reinforced pipe used for distributing liquids, gases, powders, and other fluids, for covering cables, etc.

``Prior art'' Such pipes are used for water pipes, chemical plant piping, etc., but firstly, they are made only of metal pipes, and secondly, the inner surface of the pipes is made with excellent corrosion resistance. Thirdly, ceramic powder is roughly mixed into the coating resin at a volume ratio of 3.
Fourthly, those containing sintered ceramics having a shape corresponding to the inner surface of the pipe have been conventionally used.

"Problems to be Solved by the Invention" By the way, the following problems have been pointed out with each of these conventional pipes.

First, the conventional example consisting only of metal pipes had a problem in corrosion resistance. That is, especially when delivering a corrosive fluid, the corrosion resistance is poor.

Second, the conventional example in which the inner surface of the pipe was coated with resin had a problem in wear resistance. That is, since it is coated with a resin, it has been pointed out that although it has excellent corrosion resistance, it has low hardness and is prone to wear.

Thirdly, the conventional example in which the inner surface of the pipe was coated with a resin containing about 30% by volume of ceramic powder also had problems in wear resistance.

In other words, as mentioned above, ceramics have been incorporated to deal with the problem of resins being easily worn, but in order to perform coating, that is, to apply a film, it is necessary to increase the fluidity of the resin. It was not possible to increase the content by volume to 30% or more. It has been pointed out that because the content of ceramics, which is a hard material, is small, the overall hardness is still insufficient and it is prone to wear.

Fourth, the conventional example in which sintered ceramics were inserted into the inner surface of the pipe had the problem that the material and processing costs were high and molding was not easy. In other words, since sintered ceramics are used, although they have excellent corrosion resistance and wear resistance,
It was pointed out that the processing cost is very high and it is not easy to mold.

This point was pointed out in the conventional example.

In view of these circumstances, the present invention has been made to solve the problems of the conventional methods described above. Since the material is used, it has corrosion resistance, wear resistance,
Material/processing costs.

The purpose of the present invention is to propose a method for manufacturing a reinforced pipe and a reinforced pipe that are excellent in all aspects such as ease of molding and also have high specific strength.

"Means for Solving the Problem" The technical means of the present invention to achieve this object are as follows.

Claim 1 is as follows.

That is, this reinforced pipe manufacturing method includes the following mixing step, melt forming step, and joining step.

First, in the mixing step, a large amount of ceramic powder is mixed into the resin particles so that they are densely contained in a nearly contact state when the resin is melted.

Next, in the melt-forming step, the resin is melted by heating and pressurizing to fill in and bond the gaps between the ceramic powders, and to form a reinforcing material having a shape corresponding to the inner surface of the pipe body and having an appropriate thickness.

In the joining step, the reinforcing material is joined to the inner surface of the pipe body.

Claim 2 is as follows.

That is, this reinforcing pipe includes a pipe body and a reinforcing material having an appropriate thickness that covers the inner surface of the pipe body. The reinforcing material contains ceramic powder in a molten resin in a state where they are almost in contact with each other (densely).

"Function" Since the present invention consists of such means, it works as follows.

In the method for manufacturing a reinforced pipe according to claim 1, resin particles and a predetermined amount of ceramic powder are mixed in the mixing step, and then in the melt forming step, the molten resin is heated and pressurized without coating. Ceramic powders are bonded together to form a reinforcing material in a predetermined shape, and the reinforcing material is bonded to the inner surface of the pipe body in the bonding process. In the reinforcing pipe of claim 2 manufactured in this way, the reinforcing material is made of a molten and hardened resin that contains ceramic powder densely so as to be in close contact with the reinforcing material, which covers the inner surface of the pipe body. .

Now, claim 1. The reinforcing pipe manufacturing method and reinforcing pipe according to claim 2 are as follows.

First, this reinforcing pipe has excellent corrosion resistance because the reinforcing material is made of resin and ceramics, which have better corrosion resistance than metal.

Second, since the reinforcing material contains a high concentration of ceramic, which is a hard material, and has wear resistance greater than that of metal, this reinforced pipe has excellent wear resistance.

Thirdly, since the reinforcing material is made of resin and ceramics, the material cost is low, and since the resin is melted into a predetermined shape by heating and pressurizing, the processing cost is low and molding is easy.

Fourth, since the reinforcing material has high strength and low specific gravity compared to metal, this reinforced pipe has high specific strength.

Fifth, and in this reinforcing pipe, these first and second
．． Third. The fourth points are realized together.

"Example" The present invention will be described in detail below based on the example shown in the drawings.

First, a method for manufacturing this reinforced pipe will be described in the order of a first example, a second example, and a third example, and then the reinforced pipe will be described.

The first example is as follows.

FIGS. 1, 2, 3, and 4 are used to explain a first embodiment of the present invention in which a hard flat reinforcing material 1 is used at first.

First, in the mixing process, a large amount of ceramic 3 powder is mixed into the resin 20 particles so that when the resin 2 is melted, they are almost in contact with each other and are densely contained ((2) in Figure 1). (see figure). As the resin 2, fluorine-based, epoxy-based, nylon-based, polyethylene-based, and other particulate resins are selected depending on the required degree of corrosion resistance. Ceramics 3 include oxides and carbides.

Nitride-based and other powder forms are used, and the powder form includes, of course, those in the form of fine particles.

Next, in the melt-forming process, the resin 2 is melted by heating and pressurizing to fill in the gaps between the powders of the ceramics 3 and join them, and the reinforcing material 1 is formed into a reinforcing material 1 having a shape corresponding to the inner surface of the pipe body 4 and having an appropriate wall thickness. do.

To explain this melt-forming process in detail, Fig. 1 is an explanatory front view of the reinforcing material 1, which initially has a hard flat plate shape. Each is shown enlarged. That is, the particles of the resin 2 and the powder of the ceramics 3 mixed in the above-mentioned mixing step are sandwiched in the mold 5 and heated, pressurized, or hot pressed to form a hard reinforcing material in the form of a flat plate. It is formed as l. In other words, the particles of the resin 2 melt and fill in the spaces between the powders of the ceramics 3 and join together, forming a completed plate in the shape of a hand plate.

In consideration of the molding cost, the reinforcing material 1 is molded in multiple layers at once using a mold 5, as shown in FIG. 1 (1). FIG. 2 is an explanatory front view of the stage in which the reinforcing material 1 is formed into a predetermined shape in this melt-forming process. That is, as shown in Fig. 1 (the molded hard plate-shaped reinforcing material 1 is cut into predetermined lengths, then sandwiched between the inner mold jig 61 and the outer mold jig 6□, and subjected to heating H). By being pressurized, it is hardened into a cylindrical shape that corresponds to the inner surface of the pipe body 4 and has an appropriate wall thickness.The pipe body 4 may be made of aluminum, iron, other metals, resins, or carbon. For example, the material is cylindrical.

In the subsequent joining process, the reinforcing material 1, which has been formed into a predetermined shape in the above-described melt forming process, is joined to the inner surface of the pipe body 4. FIG. 3 is a perspective view showing the step of first inserting the reinforcing material 1 into the pipe body 4. FIG. 4 is a front explanatory view showing the main parts of the reinforced pipe manufactured in this way, and the reinforcing material 1 inserted as shown in FIG. It will be done. Note that the joint 8 (see FIG. 2) when the flat reinforcing material 1 is formed into a predetermined shape such as a cylindrical shape is joined with an adhesive 7 at that time or when joined to the pipe main body 4.

The first embodiment is like this.

Next, a second embodiment will be described.

5, 6, 7, and 8 serve to explain a second embodiment of the present invention, in which a reinforcing material 1 in the form of a flat plate is initially in a semi-cured state.

First, FIG. 5 is an explanatory front view of the reinforcing material 1 during molding. That is, the particles of the resin 2 and the powder of the ceramics 3 mixed in the same mixing step as described above are heated on the molding table 9 in the next melt-forming step, and then the resin 2 is formed into a flat plate. The reinforcing material 1 is not completely cured but is in a semi-cured state, that is, in a preform shape. In addition, at this time,
It is also conceivable to apply pressure P using a press in the same manner as described above.

FIG. 6 is an explanatory front view of the stage in which the reinforcing material 1 in a semi-hardened state is cut into predetermined lengths in the melt-forming process and then heated and pressed into a predetermined shape such as a cylinder. . FIG. 7 is a perspective view showing a stage in which the reinforcing material 1, which has been formed into a predetermined shape and hardened in the melt-forming process, is inserted into the pipe body 4. In this joining process, the reinforcing material 1 is attached to the inner surface of the pipe body 4 with adhesive. 7 (see FIG. 4). The details are the same as those described in the first embodiment, so the explanation will be omitted.

By the way, FIG. 8 is a front explanatory view showing another example in which the reinforcing material 1 is formed into a predetermined shape and joined together. In other words, in the example shown in FIG. 8, the reinforcing material 1, which has been semi-hardened in FIG. An example is shown in which it is inserted into the pipe body 4 in a semi-hardened state. Then, the reinforcing material 1 is uniformly heated and pressurized from the inside of the pipe body 4 to its inner surface, so that the reinforcing material 1 has a shape corresponding to the inner surface of the pipe main body 4 and has an appropriate thickness. At the same time, it is bonded to the inner surface of the pipe body 4 and hardened. That is, in the example shown in FIG. 8, by using the reinforcing material 1 which is initially semi-hardened and flat, the latter half of the melt-forming process and the bonding process are performed simultaneously.

In this second embodiment, the contents of the other harmful steps and the structure and function of each member are the same as those described in the first embodiment, so the explanation thereof will be omitted.

The second embodiment is like this.

Next, a third embodiment will be described.

FIGS. 9 and 10 serve to explain a third embodiment of the present invention, which uses a reinforcing material 1 that is formed into a predetermined shape from the beginning in a semi-cured state.

FIG. 9 is an explanatory front view showing a step in which the reinforcing material 1 is formed into a substantially predetermined shape while remaining in a semi-cured state. That is, particles of resin 2 and ceramics 3 mixed in the same mixing process as described above.
The powder is not once made into a flat plate shape as in the first and second embodiments described above, but is made into a substantially cylindrical reinforcing material 1 in a semi-hardened state by heating H and pressure P. FIG. 10 is an explanatory front view showing the step of forming the reinforcing material 1 into a predetermined shape and joining it to the pipe body 4. That is, at the stage shown in FIG. 10, the reinforcing material 1, which has been semi-hardened and shaped into a substantially predetermined shape in FIG. Then, they are bonded and hardened while being formed into a predetermined shape in accordance with the example shown in FIG. 8 described above.

In other words, in this third embodiment, the reinforcing material l in a semi-hardened state is formed into a predetermined shape from the beginning without being made into a flat plate, and the latter half of the melt-forming process and the joining process are carried out at the same time. ing.

In this third embodiment, the contents of other harmful steps, the structure and function of each member, etc. are the same as those explained in the first and second embodiments, so their explanation will be omitted.

The third embodiment is as follows.

Next, let's talk about the reinforced pipe.

A predetermined reinforced pipe is manufactured by the above-mentioned manufacturing method, that is, by following the mixing process, melt forming process, joining process, etc. shown in Example 1.2.3. That is, this reinforcing pipe includes a pipe main body 4 and a reinforcing material 1 of an appropriate thickness that covers the inner surface of the pipe main body 4. The reinforcing material I contains a dense powder of ceramics 3 in a molten resin 2, which is almost in contact with the powder. For example, the volume fraction of the ceramic powder 3 in the reinforcing material 1 is increased to about 50% or more.

The reinforcement pipe looks like this.

The method for manufacturing a reinforced pipe and the reinforced pipe according to the present invention are as described above.

Therefore, it becomes as follows.

First, in the manufacturing method, particles of resin 2 are mixed with a predetermined amount of powder of ceramic 3 in a mixing process, and then in a melt forming process, the molten resin 2 fills the spaces between the powders of ceramic 3. Reinforcement material 1 that is joined and has a predetermined shape
In addition, the reinforcing material 1 is joined to the inner surface of the pipe body 4 in the joining process.

Further, in the reinforced pipe manufactured in this manner, the inner surface of the pipe body 4 is covered with a reinforcing material 1 made of a molten hardened resin 2 containing powder of ceramics 3 densely in almost contacting state. . In other words, the reinforcing material 1 covers the inner surface of the pipe body 4 by heating H and pressurizing P, instead of applying it in a film form as in the conventional method, so it is necessary to make the fluidity of the resin 2 extremely high during molding. This makes it possible to increase the content of ceramics 3 and make it more dense.

Now, regarding this reinforcing pipe manufacturing method and reinforcing pipe, the following 1. Second. 3rd゜4th. It will be like the fifth one.

First, the reinforcing material 1 covering the inner surface of the pipe body 4 is made of molten resin 2 and ceramics 3, which have corrosion resistance higher than that of metal.
consisting of powder. Therefore, this reinforced pipe has excellent corrosion resistance.

Second, the reinforcing material 1 covering the inner surface of the pipe body 4 contains a predetermined concentration of powder of ceramics 3, which is a hard material, and has high hardness, which makes it more resistant than metals, which are relatively wear resistant. It has abrasive properties. Therefore, this reinforced pipe has excellent wear resistance.

Thirdly, this reinforcing material 1 has a structure in which ceramic powder 3 is solidified with molten resin 2.

In this way, since the reinforcing material 1 is made of the ceramic 3 and the resin 2, the material cost is low, and since the resin 2 can be melted and easily formed into a predetermined shape by heating and pressurizing, the processing cost is low and molding is easy. Therefore, this reinforced pipe also has these characteristics.

Fourthly, since the reinforcing material 1 has high strength and low specific gravity compared to metal, this reinforcing pipe has high specific strength.

Fifth, in this reinforced pipe, each of these characteristics, such as the first corrosion resistance, the second abrasion resistance, the third material/processing cost and ease of forming, and the fourth specific strength, etc. It has been realized.

"Effects of the Invention" As explained above, the reinforcing pipe manufacturing method and reinforcing pipe according to the present invention uses a reinforcing material in which ceramic powder is densely contained in a resin almost in contact with the resin by heating and pressurizing. Therefore, the following effects are achieved.

First, this reinforced pipe has excellent corrosion resistance.

That is, the reinforcing material prevents corrosion, even when a particularly corrosive fluid is delivered, and provides excellent corrosion resistance, especially when the pipe body is made of a metal that is easily corroded, such as aluminum.

Secondly, this reinforced pipe has excellent wear resistance. In other words, the reinforcing material increases the hardness and makes it difficult to wear.

Thirdly, this reinforced pipe is excellent in terms of material and processing costs and ease of molding. That is, the reinforcing material is made of ceramic powder, resin, etc., and the material cost is low, and it can be molded by heating and pressing, and the processing cost is low and molding is easy.

Fourthly, since the reinforcing material has high strength and has a low specific gravity compared to metal, this reinforced pipe has a high specific strength.

Fifth, in this reinforced pipe, each of these points is achieved at the same time.

As described above, the effects of the present invention are remarkable, such as eliminating the problems that existed in this type of conventional example.

[Brief explanation of drawings]

The drawings serve to explain a method for manufacturing a reinforced pipe and embodiments of the reinforced pipe according to the present invention. FIGS. 1, 2, 3, and 4 are used to explain a first embodiment in which a hard plate-shaped reinforcing material is used at first. FIG. 1 is a front explanatory view of such a reinforcing material,
(1) The figure shows the product during molding, and the figure (2) shows an enlarged view of the main parts. The second is a front explanatory view showing the step of shaping the reinforcing material into a predetermined shape. FIG. 3 is a perspective view showing the step of inserting the reinforcing material into the pipe body. FIG. 4 is an explanatory front view showing the main parts of the manufactured reinforcing pipe. FIGS. 5, 6, 7, and 8 serve to explain a second embodiment in which a reinforcing material in the form of a flat plate is used in a semi-cured state at first. FIG. 5 is an explanatory front view of the reinforcing material being molded. FIG. 6 is an explanatory front view showing the step of shaping the reinforcing material into a predetermined shape. FIG. 7 is a perspective view showing the step of inserting the reinforcing material into the pipe body. FIG. 8 is an explanatory front view showing another example in which the reinforcing material is formed into a predetermined shape and joined together. FIGS. 9 and 10 serve to explain a third embodiment in which a reinforcing material is formed into a predetermined shape from the beginning in a semi-cured state. FIG. 9 is an explanatory front view showing a step in which the reinforcing material is formed into a substantially predetermined shape while remaining in a semi-cured state. FIG. 10 is an explanatory front view showing the step of forming the reinforcing material into a predetermined shape and joining it to the pipe body. 62... 7... 8... 9... H... P... External mold jig Adhesive seam forming table Heating and pressing ■... Reinforcement material 2... Resin 3 ...Ceramics 4...Pipe body 5...Mold 6I...Inner mold jig Fig. 5 Fig.

Claims (2)

[Claims] (1) First, there is a mixing process in which a large amount of ceramic powder is mixed into resin particles so that when the resin is melted, they are almost in contact with each other and are densely contained, and then the resin is heated and pressurized. A melt forming step in which the reinforcing material is melted to fill the spaces between the ceramic powders and bonded, and the reinforcing material has a shape corresponding to the inner surface of the pipe body and has an appropriate wall thickness; A method for manufacturing a reinforced pipe, comprising: a joining step of joining the reinforcing pipe to the reinforcing pipe. (2) It has a pipe body and an appropriately thick reinforcing material that covers the inner surface of the pipe body, and the reinforcing material is made of a material in which ceramic powder is almost in contact with the melted resin. A reinforcing pipe characterized by densely containing the following.