JPH0441649B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION This invention relates to a method for manufacturing a tube with a wear-resistant inner wall.

Conventional technology In general, ceramic sintered bodies such as alumina ceramic sintered bodies have excellent wear resistance.
It is used as a constituent material for tanks, hoppers, chutes, and various pipes. However, ceramic sintered bodies have the problems of relatively low wear resistance and strength, and are expensive. Therefore, except for small parts, ceramic sintered bodies have been used mainly as composite materials with iron. It was used.
For example, in the case of an iron tank, a wear-resistant inner wall was formed by gluing a large number of ceramic sintered tiles to the inside of the tank or stacking them like bricks. In the case of pipes, those with small diameters and short lengths, such as spray nozzles, blowing nozzles, and chemical injection pipes, are made from the ceramic sintered body itself.
Large diameter ones were made using the following method.

() First, epoxy or polyester adhesive is applied to a short sleeve made of a ceramic sintered body with a circular or semicircular cross section, and then the ceramic sintered body is attached to a ready-made pipe body made of iron or the like. They are successively inserted and bonded inside to create a tube with a wear-resistant inner wall.

() Second, small pieces of ceramic sintered body are pasted on one side of a rubber sheet, and these rubber sheets are successively pasted on the inside of a ready-made tube body made of iron or the like to create a tube with a wear-resistant inner wall. Create.

Problem to be solved by the invention However, according to the conventional method () above,
Molding a ceramic sintered body into a cylindrical or semi-cylindrical shape is very troublesome and has the drawbacks of high cost, and such conventional methods can only be applied to pipes for special purposes. In addition, according to the conventional method () above, tanks, hoppers, chute, etc. with relatively large diameter and short pipe openings, etc.
Furthermore, although it is possible to make long tubes with a very large diameter that a worker can fit into, it is not possible to make long tubes with a relatively small diameter that are used, for example, for transporting chillers. The problem was that I couldn't do it.

The purpose of the present invention is to make it possible to manufacture long tubes with a relatively small diameter of about 50 to 500 mm, which cannot be produced by conventional methods, and which are used for chiller transportation, etc., very easily and at low cost. It is an object of the present invention to provide a method for manufacturing a tube having a wear-resistant inner wall that can be manufactured in a manner similar to that described above.

Means for Solving the Problems In order to achieve the above object, the present invention first provides a method of the first invention in which a large number of small ceramic sintered plate-like pieces are placed on the outer peripheral surface of a mandrel in a substantially close-packed state. There is also a step of attaching the ceramic sintered body plate to the mandrel so that it can be peeled off, and a fiber-reinforced plastic raw material is wrapped around the surface of the ceramic sintered body plate on the mandrel, and then hardened to form the ceramic sintered body plate. A tube having a wear-resistant inner wall, which comprises a process of forming a tube body in close contact with a piece, and a process of removing from a mandrel the tube composed of an inner wall made of a large number of sintered ceramic plate pieces and the tube body. The gist is the manufacturing method.

Next, the method of the second invention of this invention is:
A process of attaching a large number of small ceramic sintered plate-like pieces to the outer circumferential surface of the mandrel in a substantially close-packed state so that they can be peeled off from the mandrel, and a process that wraps the ceramic sintered compact plate-like pieces on the mandrel. A process of covering and pasting a soft sheet on the plastic sheet, a process of covering the soft sheet layer with fiber-reinforced plastic raw material so as to wrap it, curing it, and forming a tube body that is in close contact with the soft sheet layer, and a process of sintering a large number of ceramics. The gist of this invention is a method for manufacturing a tube having a wear-resistant inner wall, which comprises the step of removing a tube composed of an inner wall made of a plate-like piece, a soft sheet layer, and a main body from a mandrel.

Further, the method of the third aspect of the present invention includes the step of joining a large number of small ceramic sintered plate-like pieces to one side of a soft sheet in a substantially close-packed state, and A step of wrapping a soft sheet with a piece of ceramic material on the mandrel with the plate-like piece on the inside, and covering the outer circumferential surface of the soft sheet with a ceramic sintered body plate-like piece on a mandrel so as to wrap it, and then A process of curing and forming a tube body tightly attached to the soft sheet, and removing the tube composed of the inner wall made of a large number of ceramic sintered plate-like pieces, the soft sheet layer, and the tube body from the mandrel. The gist of this paper is a method for manufacturing a tube with a wear-resistant inner wall, which consists of a process and a wear-resistant inner wall.

In the above, the ceramic sintered body plate-like piece can be made of alumina ceramic sintered body or other ceramic sintered body,
Moreover, its shape can be arbitrary, such as square, rectangle, or diamond.

In the first and second inventions, any suitable means can be used for attaching these ceramic sintered plate-like pieces to the outer peripheral surface of the mandrel in a peelable manner. For example, in the first step, a temporary fixing rubber sleeve is fitted onto the outer circumferential surface of the mandrel, and then a ceramic sintered plate is placed on the outer circumferential surface of the rubber sleeve in a substantially fine state and then attached to the mandrel with the rubber sleeve. In the first step, the tube with the wear-resistant inner wall and the rubber sleeve are removed using a mandrel, and then the rubber sleeve is removed from the tube.
Alternatively, the sleeve may be removed.

In the second and third inventions, the soft sheet layer interposed between the ceramic sintered plate and the tube body made of fiber-reinforced plastic is heated by a fluid such as chiller flowing inside the tube. This is provided to reduce the impact that the ceramic sintered plate-like piece receives and prevent it from being damaged.

Here, the soft sheet may be a sheet made of unvulcanized rubber, vulcanized rubber, or a synthetic resin such as polyvinyl chloride.

When the soft sheet is a sheet made of vulcanized rubber or synthetic resin, a large number of ceramic sintered plate-shaped pieces are bonded to these sheets with an appropriate adhesive.

When the soft sheet is made of unvulcanized rubber, the unvulcanized rubber sheet to which many small ceramic sintered plate pieces are pasted is vulcanized, and then fiber-reinforced plastic is vulcanized. Curing may be carried out, or, of course, vulcanization of the unvulcanized rubber sheet and curing of the fiber-reinforced plastic may be carried out simultaneously. When such a sheet of unvulcanized rubber is used, a portion of the rubber is preferably filled into the joints between the ceramic sintered plate pieces.

Next, embodiments of the invention will be described with reference to the drawings.

Example 1 In this example, a tube with a wear-resistant inner wall was manufactured by the method of the first aspect of the invention.

In Fig. 1, an iron mandrel 1 with an inner diameter of
Fit a temporary rubber sleeve 2 with an outer diameter of 80 mm and an outer diameter of 100 mm. Next, adhesive rubber glue is applied to the outer peripheral surface of the rubber sleeve 2 and dried.
After drying the rubber glue, a large number of alumina ceramic tiles, that is, alumina ceramic sintered plate pieces 3 having a size of 15 mm x 15 mm x 3 mm are glued to the rubber glue.
They are pasted on the outer peripheral surface of the sleeve 2 in a close-packed manner. (Figure 1 A). A polyester primer is applied to the outer surface of each ceramic tile 3 to improve adhesion to fiber reinforced plastic (FRP).

Next, from the outside of ceramic tile 3
The tube body 4 made of FRP is molded by hand lay-up method. That is, first, polyester resin is applied to the surface of the ceramic tile 3. At this time, the polyester resin enters the joints of the tiles 3. Next, a glass cloth is wrapped around it, a polyester resin is applied, and the air is defoamed using a defoaming roller. This operation was repeated to laminate three layers of glass lox, and then two layers of glass mat were laminated in the same manner. After laminating Surf Smat as a finish, a top coat layer of resin alone is provided on the outermost surface, and a predetermined layer that adheres to the ceramic tile 3 is applied.
A tube body 4 made of FRP was molded (FIG. B).

After leaving it at room temperature for one day to harden the resin,
The tube 6, which is composed of the inner wall made of ceramic tiles 3 and the tube body 4, is removed from the mandrel 1 together with the rubber sleeve 2, and then the rubber sleeve 2 is pulled out to obtain the tube 6. Figure C). The tube 6 thus obtained is shown in FIG. The inner wall of the tube 6 is made of a large number of ceramic tiles 3 arranged in a close-packed state, so it has excellent wear resistance, and the tube body 4 is made of FRP. The pipe 6 has a high mechanical strength and can be suitably used as a pipe for transporting chillers, for example.

Example 2 In this example, a tube with a wear-resistant inner wall was manufactured by the method of the second aspect of the present invention.

In FIG. 2, as in the case of Embodiment 1, a rubber sleeve 2 for temporary fixing is fitted onto an iron mandrel 1, and then a large number of ceramic tiles 3 are placed on the outer peripheral surface of the rubber sleeve 2 in a close-packed state. Paste them side by side (Figure 2 A).

Next, apply rubber to the outer surface of ceramic tile 3.
After applying a chlorinated rubber-phenolic resin primer (trade name Chemrock #205 and #220, manufactured by Lord Corporation) with good sheet adhesion, unvulcanized rubber sheet 5 with a thickness of about 1 mm was
Wrap in a layer or two layers (see figure B).

Then, in the same manner as in the first embodiment, the unvulcanized rubber sheet 5 is wrapped alternately with glass cloth and polyester resin, which are the raw materials for FRP, and glass mat and polyester resin, and then a polyethylene sheet is wrapped around the unvulcanized rubber sheet 5. These FRP
Wrap it around the surface of the raw material and tighten with nylon wrappers. This is then heated to approximately 120°C in a vulcanizer.
The rubber sheet 5 was pressurized and heated for 2 hours to vulcanize the rubber sheet 5 and harden the polyester resin, thereby forming the tube body 4 (FIG. 3C).

Ceramic tile 3 obtained in this way
By removing the tube 7, which is made up of an inner wall made of rubber, a soft rubber sheet 5, and a tube body 4, together with the rubber sleeve 2 from the mandrel 1, and then pulling out the rubber sleeve 2, the tube 7 is removed. (Figure 2). This tube 7 was further coated with surf ester for surface finishing, a top coat of polyester resin alone was applied, and the tube was left at room temperature for one day to harden the polyester resin, thereby producing a product.

The tube 7 thus obtained is made of ceramic
Inner wall made of tiles 3 and tube body 4 made of FRP
Since the soft rubber sheet layer 5 is interposed between the pipe 7 and the pipe 7, the impact on the ceramic tile 3 due to the fluid such as slurry flowing inside the pipe 7 is alleviated, thereby preventing damage to the ceramic tile 3. can be effectively prevented.

Example 3 In this example, a tube with a wear-resistant inner wall was manufactured by the method of the third aspect of the present invention.

In FIG. 3, a primer (product name: Chemlock #205 and #220) is applied to one side of the same ceramic tiles 3 as in Example 1 above, and these ceramic tiles 3 are placed on a flat mold in a close-packed manner. After arranging them in the same condition, cover them with an unvulcanized rubber sheet 5,
Press down and crimp from above using a press. During pressing, the material is heated or cooled as necessary.
In this way, an unvulcanized rubber sheet 5 having a large number of ceramic tiles 3 in close contact with one side was obtained (third
Figure A).

Next, apply a ceramic layer to the surface of mandrel 1.
The unvulcanized rubber sheet 5 having the tiles 3 is wrapped around the ceramic tiles 3 on the inside (FIG. 2B).

The unvulcanized rubber sheet 5 was then covered with a nylon wrapper and heated in a vulcanizer under a steam pressure of 4 kg/cm ² for 1 hour to vulcanize the rubber sheet 5. After vulcanization, the nylon lapper is removed and the vulcanized rubber sheet 5 with the ceramic tiles 3
After buffing the surface of the sheet 5, a polyester primer was applied to the surface of the sheet 5.

Next, wrap around the vulcanized rubber sheet 5.
After covering with the FRP raw material in the same manner as in the above example, the tube body 4 was formed by leaving it at room temperature for one day to harden the FRP (FIG. 3C).

The tube 7 thus obtained was removed from the mandrel 2 together with the rubber sleeve 2, and then the rubber sleeve 2 was pulled out to obtain the tube 7 (FIG. D). This tube 7 had the same configuration as in Example 2, and therefore had similar performance.

5 to 9 show specific examples of how to arrange the ceramic tiles 3 used in the method of the present invention. First, in FIG. 5, a large number of ceramic tiles 3 which are rectangular when viewed from the top are arranged in series in the vertical and horizontal directions, just like a checkerboard. FIG. 6 shows similarly rectangular ceramic tiles 3 arranged in a so-called zigzag pattern in which adjacent rows of ceramic tiles 3 are offset from each other by half the width. FIG. 7 shows diamond-shaped ceramic tiles 3 arranged vertically and horizontally in series when viewed from above. FIG. 8 shows rectangular ceramic tiles 3 arranged vertically and horizontally in series when viewed from above. In FIG. 9, similarly rectangular ceramic tiles 3 are arranged in a staggered manner such that the ceramic tiles 3 in adjacent rows are offset from each other by half the width.

FIG. 10 shows a modification of the means for connecting both ends of the ceramic tile 3. In FIG. Upper connecting protrusion 3A on the upper side of one end of each ceramic tile 3
is provided in the extending direction of the tile 3, and a lower connecting protrusion 3B is provided below the other end in the extending direction of the tile 3. These ceramic tiles 3 are then assembled so that the upper connecting protrusions 3A and lower connecting protrusions 3B of adjacent ceramic tiles 3 overlap each other, and arranged in a close-packed manner on the inner surface of the tube body 4. It is something to do.

FIGS. 11 and 12 show a specific example of a tube connecting means manufactured by the method of the present invention.

First of all, in Fig. 11, a large number of ceramic
An FRP joint made of a flange part 10A having bolt holes 11 and a cylindrical base part 10B at the connecting end of a pipe 6 according to the present invention, which is composed of an inner wall made of tiles 3 and a pipe body 4 made of FRP. 10 is fixed with an adhesive, and a reinforcing material 12 made of FRP is further coated over the cylindrical base 10B of the joint 10 and the outer circumferential surface of the tube 6 via an adhesive. Therefore, the connecting ends of the two pipes 6 that are butted together are connected to each other by bolts and nuts (not shown) via such a flange joint 10.

Next, in FIG. 12, two
The connecting ends of the main tubes 6 are connected by a so-called Victory joint 13.
That is, an iron sleeve 14 having a shallow annular groove 15 is fitted over the abutting ends of the two tubes 6, and these are fixed with an adhesive, and then both sleeves 14 are straddled. Fit and cover the annular rubber packing 16 so that it fits. Furthermore, a pair of semi-circular connecting fittings 17 when viewed from the front are placed on the outside of the packing 16 so as to surround both sleeves 14 as a whole, and both side edges 17a of the connecting fittings 17 are respectively fitted into the grooves 15 of the sleeve 14. Both ends of these connecting fittings 17 are connected to each other by bolts and nuts (not shown).

Note that the tubes 6 or 7 manufactured by the method of the present invention may of course be connected by other connecting means.

Further, although the tube manufactured by the method of the present invention usually has a circular cross section, it is of course possible to have other cross-sectional shapes such as an ellipse or a square, and the tube may be tapered. It may be something that was given.

Effects of the Invention The method of the present invention is as described above, so that it is possible to produce long pieces having a relatively small diameter of about 50 to 500 mm, which are used for chiller transportation, etc., which could not be produced by conventional methods. This has the special effect of making it possible to manufacture the tube extremely easily and at low cost.

[Brief explanation of drawings]

FIG. 1 is a process diagram for explaining an embodiment of the first invention of the present invention, FIG. 2 is a process diagram for explaining an embodiment of the second invention of the invention, and FIG. 3 Process diagrams for explaining embodiments of the invention,
FIG. 4 is a partial perspective view of a tube manufactured by the method of the first invention. Figures 5 to 9 show the arrangement of various ceramic tiles. Figure 5 is a front view showing the first example of the arrangement of ceramic tiles, and Figure 6 is a front view showing the first example of the arrangement of ceramic tiles.
Figure 7 is a front view of the second example, Figure 7 is a front view of the third example, Figure 8 is a front view of the fourth example, and Figure 9 is a front view of the fifth example. be. FIG. 10 is a sectional view showing a specific example of a connecting means for ceramic tiles, FIG. 11 is a partial longitudinal sectional view showing a specific example of a connecting means for pipes manufactured by the method of the present invention, and FIG.
FIG. 2 is a partial vertical sectional view showing two tubes manufactured by the method of the present invention connected using a Victory joint. 1... Mandrel, 2... Rubber sleeve for temporary fixing, 3... Ceramic tile (sintered ceramic plate), 4... Pipe body, 5... Rubber sheet (soft sheet), 6, 7... Pipe, 10... Flange joint, 13... Victory joint.

Claims (1)

[Claims] 1. A process of attaching a large number of small ceramic sintered plate-like pieces to the outer circumferential surface of the mandrel in a substantially close-packed state so that they can be peeled off from the mandrel, and a process of sintering the ceramic on the mandrel. A process of covering the surface of the body plate-shaped piece with fiber-reinforced plastic raw material so as to wrap it, and then curing it to form a tube body that is in close contact with the ceramic sintered body plate-shaped piece, and a process of forming a large number of ceramic sintered body plate-shaped pieces. A method for producing a tube having a wear-resistant inner wall, which comprises the step of removing a tube constituted by a piece of inner wall and a tube body from a mandrel. 2. In the first step, a temporary fixing rubber sleeve is fitted onto the outer circumferential surface of the mandrel, and then a ceramic sintered plate is placed on the outer circumferential surface of the rubber sleeve in a substantially fine state and attached to the mandrel with the rubber sleeve. In the final process, a tube with a wear-resistant inner wall and a rubber
After removing the sleeve with a mandrel,
2. The method of claim 1, wherein the rubber sleeve is removed from the tube. 3 A process of pasting a large number of small ceramic sintered plate-like pieces on the outer circumferential surface of the mandrel in a nearly close-packed state so that they can be peeled off from the mandrel, and a process of pasting a large number of small ceramic sintered plate-like pieces on the outer circumferential surface of the mandrel so that they can be peeled off from the mandrel. A process of covering and pasting the sheet, a process of covering the soft sheet layer with fiber-reinforced plastic raw material so as to wrap it, and then curing it to form a tube body that is in close contact with the soft sheet layer, and a process of forming a large number of ceramic sintered plates. A method of manufacturing a tube having a more wear-resistant inner wall, including the step of removing a tube made of a mandrel, which is made up of an inner wall made of a shaped piece, a soft sheet layer, and a tube body. 4 In the first step, a rubber sleeve for temporary fixing is fitted onto the outer circumferential surface of the mandrel in advance, and then a ceramic sintered plate-shaped piece is placed on the outer circumferential surface of the rubber sleeve in a substantially fine state and attached to the mandrel with the rubber sleeve. In the final process, a tube with a wear-resistant inner wall and a rubber
After removing the sleeve with a mandrel,
4. The method of claim 3, wherein the rubber sleeve is removed from the tube. 5 A step of joining a large number of small ceramic sintered plate-like pieces to one side of the soft sheet in a nearly close-packed state, and a process of joining the soft sheet having the ceramic sintered plate-like pieces to the outer peripheral surface of the mandrel. The process of wrapping the soft sheet on the inside and covering it with the fiber-reinforced plastic raw material is wrapped around the outer circumferential surface of the soft sheet with the ceramic sintered plate piece on the mandrel, and then hardened to form the tube body that is tightly attached to the soft sheet. A tube having a wear-resistant inner wall, which comprises a step of forming a tube, and a step of removing the tube, which is composed of a large number of ceramic sintered plate-shaped pieces, a soft sheet layer, and a tube body, from a mandrel. manufacturing method.