JP2013238297A - Method for producing laminated composite pipe and laminated composite pipe obtained by the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated composite pipe constituted by uniformly bonding a metal pipe and an FRP pipe over a whole length and having an elongate bonding length without applying forming machining for obtaining inner diameter precision in an inner peripheral surface of the metal pipe using the generally available FRP pipe, and to provide a method for producing the same.SOLUTION: A method for producing a laminated composite pipe 1 comprising a metal outer pipe 11 comprising metal and a resin inner pipe 12 comprising fiber reinforced resin arranged inside of the metal outer pipe 11 coaxially with the same includes a mouth forming step 101 arranging a mouth forming part by drawing one end of the metal outer pipe 11, an inserting step S102a inserting the resin inner pipe 12 into the metal outer pipe 11 from an opening end side of the metal outer pipe 11, and extracting and extending step S104 carrying out cold drawing out machining for coaxially laminating and integrating the metal outer pipe 11 and the resin inner pipe 12 by contracting the inner diameter of the metal outer pipe 11 by drawing out the metal outer pipe 11 into which the resin inner pipe 12 is inserted via a solid die.

Description

The present invention relates to a method for manufacturing a laminated composite pipe that requires high-speed rotation characteristics, high rigidity characteristics, and low moment characteristics, and a laminated composite pipe obtained thereby.

  Conventionally, tubular rotating members of large machines and large apparatuses are often made of metal, particularly iron, from the viewpoint of being able to withstand the strength of the structural member, the moment applied to the structural member, such as a roll base material of a printing press, for example. Yes. However, since iron has a high density, an iron tubular rotating member is likely to be heavy, and a large amount of energy is required when starting and stopping the tubular rotating member, which tends to cause inconvenience in rotation control. Further, when iron is used for the tubular rotating member, there is a disadvantage that it is difficult to perform the operation due to its weight when replacing the tubular rotating member.

Of the tubular rotating members, those used in printing machines, film making machines, paper machines, etc. are subjected to surface processing in order to improve surface accuracy and reduce surface friction. Thus, not only strength but processing characteristics are required for the tubular rotating member. Further, the tubular rotating member is required to have material characteristics such as a material that has a small rotational friction and is difficult to be charged.
As a material that satisfies these requirements, a composite material of a metal and FRP obtained by replacing a part of a metal material with a fiber reinforced resin (FRP) has been attracting attention.

  As a manufacturing method of a composite material in which the outer peripheral surface used for such a tubular rotating body is a metal and the inner peripheral surface is a resin, a resin tube inserted into a metal tube as described in Patent Document 1 is used. A manufacturing method is known in which tubes are brought into close contact with each other by heating and cooling sequentially in the longitudinal direction of the tubes. Also, as described in Patent Document 2, a mandrel mandrel wrapped with carbon fiber reinforced resin is inserted into the inside of a metal tube, and the mandrel is heated and expanded so that the metal tube and the synthetic resin tube are in close contact with each other. It has been known.

Japanese Patent No. 3913492 Japanese Patent No. 4157910

  However, an FRP resin tube for replacing a part of a metal tube to ensure strength is not only highly rigid and difficult to deform, but also has heat shrinkability. Therefore, as in the manufacturing method described in Patent Document 1, the inner surface Producing a tubular composite material by utilizing the expansion of the resin tube on the side is not a good solution for its production. In particular, the production method is difficult to use when producing a large tubular composite material.

Even if the problem related to the expansion of the resin tube is solved, when the resin tube is mechanically inserted into the metal tube in the manufacturing method, first, the straightness of the inner peripheral surface of the metal tube is controlled. The inner diameter needs to be honed. At the same time, it is necessary to increase the outer diameter accuracy while controlling the straightness of the outer surface of the resin pipe. And after making both the bending directions correspond, you have to press-fit a resin pipe into a metal pipe.
Furthermore, even if this effort is required, there still remains a problem that the resin tube is caught in the middle of press-fitting and the press-fitting process becomes impossible.

  On the other hand, in the manufacturing method described in Patent Document 2, which is considered unlikely to cause a problem of press-fitting, a mandrel mandrel wound with FRP is heated and expanded. This manufacturing method has a problem that even if aluminum having a large thermal expansion coefficient is used as the material of the mandrel, the mandrel has a small amount of expansion and does not reach the necessary amount of expansion, so that it is difficult to obtain a uniform adhesion between the metal and the FRP. Further, in order to produce a large tubular composite material, not only the volume of the mandrel is increased, but there is a problem that the manufacturing cost is increased because a large heating equipment is required.

  And the composite material pipe | tube obtained by the said manufacturing method has problems, such as the processing precision of a composite material pipe | tube falling by the heating at the time of manufacture, and the joining strength of a metal pipe and a FRP pipe | tube fall by heating nonuniformity. It was.

  The present invention has been made in view of the above-mentioned problems, and generally uses an FRP pipe made of a resin having a low coefficient of thermal expansion or a negative coefficient of thermal expansion. A laminated composite pipe that can be made into a long joint length in which the metal pipe and the FRP pipe are uniformly joined over the entire length without performing homing processing or the like to obtain high inner diameter accuracy on the inner peripheral surface of It is an object to provide a manufacturing method and a laminated composite pipe obtained thereby.

  A manufacturing method of a laminated composite pipe according to the present invention is a laminated composite pipe comprising a metal outer pipe made of metal and a resin inner pipe made of fiber reinforced resin installed coaxially inside the metal outer pipe. In the manufacturing method, the mouth attaching step, the insertion (application) step, and the drawing step are performed in this order.

  According to such a procedure, in the manufacturing method of the laminated composite pipe, the end portion of the metal outer pipe is squeezed to a predetermined diameter by the mouth fitting step to provide the mouth portion, and the grip portion at the time of drawing in the drawing step is provided. In the manufacturing method, the other end of the mouthed portion of the metal outer tube in which the mouthed portion is provided without press-fitting the resin inner tube having an outer diameter equal to or smaller than the inner diameter of the metal outer tube into the metal outer tube by the inserting step. The resin inner tube is inserted from the open end side of the metal, and the metal outer tube and the resin inner tube are overlapped while preventing the resin inner tube from protruding and dropping from the metal outer tube by the mouthed portion. Further, in the manufacturing method, the inner diameter of the outer metal pipe is reduced to be equal to or smaller than the outer diameter of the inner resin pipe by pulling out the outer metal pipe into which the inner resin pipe is inserted through a solid die. The metal outer tube and the resin inner tube are coaxially adhered and laminated and integrated.

  Next, in the method for manufacturing a laminated composite pipe according to the present invention, in the drawing step, the inner diameter of the metal outer pipe is in a range of 0% to 0.5% with respect to the outer diameter of the inner resin pipe. The diameter may be reduced.

  According to such a procedure, in the method for manufacturing a laminated composite pipe, in the drawing process, the metal outer pipe and the resin inner pipe are securely adhered to each other without making a gap between the metal outer pipe and the resin inner pipe, and laminated and integrated. The laminated composite pipe can be made, and the joint strength between the metal outer pipe and the resin inner pipe in the laminated composite pipe laminated and integrated is improved.

  In the method for manufacturing a laminated composite pipe according to the present invention, a rotating feed roller having a contact surface parallel to the rotation axis or a contact surface inclined with respect to the rotation axis in the insertion step is applied to the resin inner tube. The resin inner tube is inserted from the open end side of the metal outer tube while being pushed out toward the metal outer tube via the rotary feed roller by rotating the resin inner tube with the central axis as a rotation axis. Good.

  According to such a procedure, in the method of manufacturing a laminated composite pipe, the resin inner pipe is inserted into the metal outer pipe while rotating with its central axis as the rotation axis, so that the metal outer pipe and the resin inner pipe are rotated while being kept coaxial. It is possible to insert faster than without inserting.

  In the method for manufacturing a laminated composite pipe according to the present invention, a rotating feed roller having a contact surface parallel to the rotation axis or a contact surface inclined with respect to the rotation axis in the insertion step is applied to the resin inner tube. The resin inner tube is pushed out toward the metal outer tube so that the resin inner tube is rotated about the central axis of the resin inner tube via the rotary feed roller, while the metal outer tube is open. In the same way, it is possible to insert the metal outer tube and the resin inner tube faster than when inserting them without rotating while keeping the same axis.

  In the method for manufacturing a laminated composite pipe according to the present invention, a rotating feed roller having a contact surface parallel to the rotation axis or a contact surface inclined with respect to the rotation axis in the insertion step is applied to the resin inner tube. The resin inner tube is rotated about its central axis as a rotation axis by rotating the rotary feed roller with its central axis as a rotation axis, and the metal inner tube is moved toward the metal outer tube Even if inserted from the open end side of the outer tube, it is possible to insert the metal outer tube and the resin inner tube in the same manner faster than inserting them without rotating while maintaining the same axis.

  And the manufacturing method of the laminated composite pipe which concerns on this invention inserts the said resin inner pipe | tube from the open end side of the said metal outer pipe | tube, applying the resin for adhesion to the outer surface of the said resin inner pipe | tube in the said insertion process. Good.

  In the manufacturing method of the laminated composite pipe according to the procedure, the metal outer pipe and the resin inner pipe are connected to each other by providing a resin layer made of the adhesive resin between the metal outer pipe and the resin inner pipe. In addition to the frictional force between the inner peripheral surface of the metal outer tube and the outer peripheral surface of the resin inner tube due to the reduced diameter, the resin is also joined by the resin.

  In the manufacturing method of the laminated composite pipe according to the procedure, the adhesive resin is applied to the entire outer peripheral surface of the resin inner pipe while rotating the resin inner pipe around the central axis thereof, and the adhesive resin is applied. By inserting the resin inner tube into the metal outer tube, it is possible to reliably provide a resin layer made of the adhesive resin between the metal outer tube and the resin inner tube without any gap.

  Furthermore, in the method for manufacturing a laminated composite pipe according to the present invention, in the insertion step, the adhesive resin held in a cylindrical shape is penetrated by a container installed on the insertion path for inserting the resin inner pipe into the metal outer pipe. By doing so, you may insert from the open end side of the said metal outer tube | pipe, apply | coating the said resin for adhesion to the outer peripheral surface of the said resin inner tube | pipe.

  According to such a procedure, in the method of manufacturing a laminated composite pipe, the adhesive resin is efficiently applied to the outer peripheral surface by penetrating the adhesive resin held in a cylindrical shape before the resin inner pipe is inserted into the metal outer pipe. Is going to.

  In the manufacturing method of the laminated composite pipe according to the above procedure, the resin inner pipe rotating around the central axis serves as the rotation surface of the resin inner pipe, and the central axis of the resin inner pipe is brought into contact with the rotary feed roller. Both pushing out (moving) in the direction can be performed simultaneously, simply, efficiently and effectively. And in the said manufacturing method, while the resin inner pipe | tube rotates before inserting in a metal outer pipe | tube, the application | coating of the said adhesive resin to an outer peripheral surface is efficiently carried out by penetrating the adhesive resin hold | maintained cylindrically. Is going to.

  According to such a procedure, in the method of manufacturing a laminated composite tube, the resin inner tube fed in a linear direction contacts the rotary feed roller, thereby rotating the resin inner tube and pushing out (moving) the resin inner tube in the central axis direction. Both can be performed simultaneously, simply, simply, efficiently and effectively. And in the said manufacturing method, while the resin inner pipe | tube rotates before inserting in a metal outer pipe | tube, the application | coating of the said adhesive resin to an outer peripheral surface is efficiently carried out by penetrating the adhesive resin hold | maintained cylindrically. Is going to.

  In the manufacturing method of the laminated composite pipe according to the procedure, the rotation of the resin inner pipe and the movement of the resin inner pipe in the central axis direction are performed by rotating the rotation feeding roller in a state where the resin inner pipe is in contact with the rotation feeding roller. Both can be performed simultaneously, simply, simply, efficiently and effectively. And in the said manufacturing method, while the resin inner pipe | tube rotates before inserting in a metal outer pipe | tube, the application | coating of the said adhesive resin to an outer peripheral surface is efficiently carried out by penetrating the adhesive resin hold | maintained cylindrically. Is going to.

  A laminated composite tube according to the present invention is a laminated composite tube manufactured by the manufacturing method according to any one of claims 1 to 7, wherein the metal outer tube is made of the metal, and the metal outer tube. In the laminated composite pipe comprising a resin inner pipe made of fiber reinforced resin placed coaxially inside, the metal outer pipe may be formed of any of aluminum, copper, titanium, stainless steel, and brass. Absent.

  With such a structure, the laminated composite pipe is lighter than that manufactured by general iron, and at the same time, the advanced surface treatment characteristics and the fiber reinforced resin (FRP) pipe of aluminum appearing on the outer peripheral surface of the laminated composite pipe Combined with strength.

  The laminated composite pipe according to the present invention is a laminated composite pipe produced by the production method according to any one of claims 1 to 7, wherein the resin inner pipe is composed of one layer or two or more layers. It is good also as a carbon fiber reinforced resin pipe (CFRP pipe).

  With such a configuration, the laminated composite pipe has further higher rigidity, higher strength, and lower rotational moment of inertia characteristics than a laminated composite pipe using a general fiber reinforced resin (FRP).

  A laminated composite pipe according to the present invention is a laminated composite pipe manufactured by the manufacturing method according to any one of claims 1 to 7, wherein a resin is interposed between the metal outer pipe and the resin inner pipe. You may have a layer.

  With such a configuration, in the laminated composite pipe, the metal outer pipe and the resin inner pipe are more firmly adhered to each other by the resin layer provided between the metal outer pipe and the resin inner pipe.

  A laminated composite pipe according to the present invention is a laminated composite pipe manufactured by the manufacturing method according to any one of claims 1 to 7, wherein a resin between the metal outer pipe and the resin inner pipe is used. The layer may be an electrically conductive resin.

  With such a configuration, the laminated composite pipe is configured such that the resin layer provided between the metal outer pipe and the resin inner pipe has electrical conductivity, so that the metal outer pipe and the resin inner pipe are electrically connected to each other. Improve sex.

  A laminated composite pipe according to the present invention is a laminated composite pipe manufactured by the manufacturing method according to any one of claims 1 to 7, wherein the outer peripheral surface of the metal outer pipe has a large cross-sectional shape. In addition to the square shape, the cross-sectional shape of the outer peripheral surface of the resin inner tube may be a polygon corresponding to the cross-sectional shape of the inner peripheral surface of the metal outer tube.

  With this structure, the laminated composite pipe increases the bonding force between the metal outer pipe and the resin inner pipe, and the presence of a non-slip part (side) allows the metal outer pipe and the resin inner pipe to transmit force to each other. When the laminated composite pipe is used as a tubular rotating member, torque can be reliably transmitted between the metal outer pipe and the resin inner pipe.

  A laminated composite pipe according to the present invention is a laminated composite pipe manufactured by the manufacturing method according to any one of claims 1 to 7, wherein an electrode portion is provided at an end of the metal outer pipe. Also good.

  With such a configuration, the laminated composite pipe can easily and reliably perform the surface treatment of the metal outer pipe using the electrode portion provided at the end of the metal outer pipe.

  According to the present invention, by using an FRP pipe made of a resin having a low coefficient of thermal expansion that is generally available or a negative coefficient of thermal expansion, high inner diameter accuracy is achieved on the inner peripheral surface of the outer peripheral side metal pipe. A method for producing a laminated composite pipe capable of having a long joining length obtained by uniformly joining a metal pipe and an FRP pipe over the entire length without performing homing processing or the like to obtain, and a laminated composite pipe are obtained. It is done.

It is the perspective view which showed the manufacturing method of the laminated composite pipe which concerns on this invention. It is sectional drawing which showed the manufacturing method (insertion coating process) of the laminated composite pipe | tube which concerns on this invention. It is a schematic diagram which shows operation | movement of the rotation feed roller with which the insertion apparatus used for the manufacturing method of the laminated composite pipe which concerns on this invention is equipped. It is a schematic diagram which shows operation | movement of the rotating roller with which the insertion apparatus used for the manufacturing method of the laminated composite pipe which concerns on this invention is equipped. It is sectional drawing which showed the manufacturing method (drawing process) of the laminated composite pipe which concerns on this invention. It is a schematic diagram of the laminated composite pipe | tube which concerns on this invention. It is the flowchart which showed the manufacturing method of the laminated composite pipe | tube which concerns on this invention. It is the flowchart which showed the modification about the manufacturing method of the laminated composite pipe | tube which concerns on this invention. It is the flowchart which showed the other modification about the manufacturing method of the laminated composite pipe | tube which concerns on this invention.

  Hereinafter, a laminated composite pipe and a manufacturing method thereof according to the present invention will be described in detail with reference to the drawings based on embodiments of the present invention. First, the configuration of the laminated composite pipe will be described, and then the manufacturing method of the laminated composite pipe will be described.

[Laminated composite pipe]
The laminated composite tube is used for various rolls such as a transfer roll and a paper feed roll of a large printing press, as well as long and large diameter members that rotate at high speed.
As shown in FIG. 6 (a), the laminated composite tube 1 is integrated by joining a metal outer tube 11 made of metal and a resin inner tube 12 made of fiber reinforced resin so that their central axes are coaxial. It is a tubular body. As shown in FIG. 6B, the laminated composite tube 1 may have a resin layer 13 made of an adhesive resin between the metal outer tube 11 and the resin inner tube 12.

<Metal outer tube>
The metal outer tube 11 is a tubular body made of metal. The outer peripheral surface of the metal outer tube 11 forms a laminated composite tube 1 as shown in FIG. Hereinafter, the material, shape, etc. will be described.

(Material)
The material of the metal outer tube 11 is not particularly limited as long as it can be cold drawn in the drawing step S104 described later. The material and component composition of the metal outer tube 11 can be appropriately selected according to the conditions, environment, and processing conditions when the laminated composite tube 1 is used.

The material of the metal outer tube 11 is preferably aluminum (alloy), copper (alloy), titanium (alloy), stainless steel, or brass (brass). Thereby, it becomes possible to manufacture the laminated composite pipe 1 utilizing the physical properties and characteristics of the metal.
Further, the metal component only needs to meet the target conditions and can be cold drawn in the drawing step S104. Examples of components of the metal (alloy) that can be used for the metal outer tube 11 include JIS H 4080, JIS H 3300, JIS H 4630, JIS G 3468, JIS G 3459, JIS C 2700T, and the like.

Among them, the material of the metal outer tube 11 is more preferably aluminum (including an aluminum alloy; the same applies hereinafter). Aluminum is excellent in ductility, and cold drawing can be easily performed in a drawing step S104 described later. In addition, since the density of aluminum is about 1/3 that of iron, it is possible to reduce the weight of the laminated composite pipe 1. Thereby, it becomes possible to give the low-rotation inertia moment characteristic to the laminated composite pipe 1. Furthermore, the surface treatment characteristics and high rigidity of aluminum can be imparted to the laminated composite pipe 1.
Examples of the type of aluminum alloy used in the present embodiment include JIS A 1050, JIS A 3003, JIS A 5052, JIS A 5056, JIS A 6061, and JIS A 6063. Further, when the metal outer tube 11 is used for a roll base used in a printing press, a rotating body requiring high speed and low moment characteristics, or a structural support requiring high elasticity, JIS A5052, JIS A 5056, JIS A 6N01, etc. are used.

(shape)
As shown in FIG. 6A, the shape of the metal outer tube 11 is preferably a tubular shape having a circular cross section (inner peripheral surface) perpendicular to the central axis. As a result, the resin outer tube 11 can be uniformly tightened by uniformly reducing the diameter of the metal outer tube 11, and the central axes of the metal outer tube 11 and the resin inner tube 12 can be easily made coaxial. Further, since the central axes of the metal outer tube 11 and the resin inner tube 12 are coaxial, when the laminated composite tube 1 is used as a rotating body, the rotation with the central axis as the rotation axis becomes more stable. Furthermore, the resin inner tube 12 can be easily rotated when the adhesive resin 31 is applied to the outer surface of the resin inner tube 12 having an outer shape corresponding to the inner surface shape of the metal outer tube 11 in the insertion application step S102 described later.

  Next, the outer diameter of the metal outer tube 11 of the laminated composite tube 1 is preferably set to 103% or more of the finished diameter of the laminated composite tube 1 in consideration of cold drawing performed in the drawing process.

Further, the inner diameter of the metal outer tube 11 is determined by ease of insertion of the resin inner tube 12 into the metal outer tube 11 in an insertion coating step S102 (insertion step S102a) described later, and cold drawing processing in a drawing step S104 described later ( It is determined from the relationship between the tightening allowance in the drawing process and the crimping rate of the metal outer tube 11 and the resin inner tube 12 controlled by the tightening allowance.
That is, the inner diameter of the metal outer tube 11 is 102% to 110% of the outer diameter of the resin inner tube 12 or 3 mm to 10 mm from the outer diameter of the resin inner tube 12 so that the resin inner tube 12 can be inserted. It is preferable to increase it in the following range. When the inner diameter of the metal outer tube 11 is less than 102% of the outer diameter of the resin inner tube 12, or less than 3 mm from the outer diameter of the resin inner tube 12, it is difficult to insert the resin inner tube 12 into the metal outer tube 11. Become. On the other hand, when the inner diameter of the metal outer tube 11 is 110% of the outer diameter of the resin inner tube 12 or exceeds 10 mm from the outer diameter of the resin inner tube 12, the metal outer tube 11 and the resin inner tube 12 are brought into close contact with each other. The number of work processes required for the increase. For this reason, a manufacturing cost increases.

  The thickness of the metal outer tube 11 is preferably 1/10 or more and 1/2 or less of the wall thickness of the resin inner tube 12. When the thickness of the metal outer tube 11 is less than 1/10 of the thickness of the resin inner tube 12, when the outer peripheral surface of the laminated composite tube 1 is cut, the outer peripheral surface may be cracked. If the thickness of the metal outer tube 11 exceeds 1/2 of the thickness of the resin inner tube 12, the effect of reducing the weight and reducing the rotational moment is reduced.

(Surface roughness)
The surface roughness of the inner peripheral surface of the metal outer tube 11 increases the surface friction by increasing the contact area between the inner peripheral surface of the metal outer tube 11 and the outer peripheral surface of the resin inner tube 12, thereby joining the laminated composite tube 1 to each other. This is an important factor for improving strength.
The surface roughness of the inner peripheral surface of the metal outer tube 11 is preferably 0.2 or more and 3.0 or less in terms of Ra (arithmetic average roughness, the same applies hereinafter). When the surface roughness Ra of the inner peripheral surface of the metal outer tube 11 is less than 0.2, the metal outer tube depends on the surface roughness of the outer peripheral surface of the resin inner tube 12 and the outer diameter of the resin inner tube 12. When the proof stress of 11 is σ, the outer diameter of the resin inner tube is d, and the length of the laminated composite tube is L (the same applies hereinafter), the rotational torque of the laminated composite tube 1 is greater than or equal to σπd ² L, so that the metal outer tube 11 And the resin inner tube 12 are easily separated. On the other hand, when Ra exceeds 3.0, the number of work steps for securing the inner surface roughness of the metal outer tube increases. For this reason, a manufacturing cost increases.

  In addition, the metal outer tube | pipe 11 which not only used the metal outer tube | pipe 11 produced so that the said range might be satisfy | filled but processed the inner peripheral surface of the metal tube generally available so that the said range may be satisfy | filled with a file etc. May be used.

<Resin inner tube>
The resin inner tube 12 is a tubular body made of fiber reinforced resin (FRP). The inner peripheral surface of the resin inner tube 12 forms the inner peripheral surface of the laminated composite tube 1.
The resin inner tube 12 is a long laminated composite tube 1 that is reinforced with rigidity of the metal outer tube 11 by its excellent rigidity, thereby improving the rigidity of the entire laminated composite tube 1 and improving the dimensional accuracy. Make it possible. At the same time, the resin inner pipe 12 having a low density occupies a certain volume of the laminated composite pipe 1, thereby reducing the proportion of the metal outer pipe 11 and making the laminated composite pipe 1 lightweight.
Hereinafter, the material, shape, etc. will be described.

(Material)
Here, the material of the resin inner tube 12 is a fiber reinforced resin (FRP). If the kind of resin which comprises the said fiber reinforced resin (FRP) is generally available, the kind will not ask | require. The resin may be thermally expandable or heat shrinkable, and is preferably an unsaturated polyester resin, an epoxy resin, a polyamide resin, or a phenol resin.

The material of the resin inner tube 12 is preferably carbon fiber reinforced resin (CFRP) among fiber reinforced resins (FRP) in consideration of the strength of the laminated composite tube 1 and the use for a large rotating body which is the main purpose of use. As the fiber constituting the carbon fiber reinforced resin, both PAN type and pitch type can be used. The PAN system is advantageous in that it is cheaper, has a stable quality, and is easily available.
By using a carbon fiber reinforced resin as the material of the resin inner tube 12, it is possible to have a strength higher than that obtained by using a general fiber reinforced resin.

  As shown in FIGS. 6A to 6C, the number of resin layers in the resin inner tube 12 or 12a is one or more. From the viewpoint of relaxing the directionality of the mechanical strength of the resin tube, the number of laminated layers is more preferably 3 or more.

(shape)
As shown in FIG. 6A, the shape of the resin inner tube 12 is preferably a cylindrical shape having a circular shape in a cross section perpendicular to the central axis. This makes it easier to apply the adhesive resin 31 to the outer surface of the resin inner tube 12 while rotating the resin inner tube 12 in an insertion application step S102 described later.

  In consideration of the outer diameter of the resin inner pipe 12 when the laminated composite pipe 1 is finished, it is preferable that the outer diameter of the resin inner pipe 12 is approximately the same as the outer diameter of the resin inner pipe 12 when finished.

  The thickness of the resin inner tube 12 is preferably 50% to 95% of the finished thickness of the laminated composite tube 1 and 200% or more of the metal outer tube 11. The thickness of the resin inner tube 12 is more preferably 50% to 90% of the finished thickness of the laminated composite tube 1 and 200% or more of the metal outer tube 11. If the thickness of the inner resin pipe 12 exceeds 95% of the finished thickness of the laminated composite pipe 1, the outer peripheral face may be cracked when the outer peripheral face of the laminated composite pipe 1 is cut.

(Surface roughness)
The surface roughness of the outer peripheral surface of the resin inner tube 12 is important for increasing the contact area between the inner peripheral surface of the metal outer tube 11 and the outer peripheral surface of the resin inner tube 12 and improving the bonding strength of the laminated composite tube 1. is there.
The surface roughness of the outer peripheral surface of the resin inner tube 12 is preferably 0.2 or more and 3.0 or less in terms of Ra (arithmetic mean roughness). When the surface roughness Ra of the outer peripheral surface of the resin inner tube 12 is less than 0.2, the laminated composite tube 1 depends on the surface roughness of the inner peripheral surface of the metal outer tube 11 and the inner diameter of the metal outer tube 11. When a rotational torque of σπd ² L or more is applied to the metal outer tube 11, the metal outer tube 11 and the resin inner tube 12 are easily separated. On the other hand, when the surface roughness Ra of the outer peripheral surface of the resin inner tube 12 exceeds 3.0, the number of work steps for ensuring the outer surface roughness of the resin inner tube increases. For this reason, a manufacturing cost increases.

<Resin layer>
As shown in FIG. 6B, the resin layer 13 allows the inner peripheral surface of the metal outer tube 11 and the outer peripheral surface of the resin inner tube 12 to be bonded to improve the bonding strength of the laminated composite tube 1. . Thereby, when the laminated composite tube 1 is used as a tubular rotating member, it is possible to further prevent the metal outer tube 11 and the resin inner tube 12 from being separated.

(resin)
The resin that forms the resin layer 13 (adhesive resin 31) is preferably a slow-hardening resin that begins to cure after the drawing step S104 described below is completed. Thereby, since the resin inner pipe | tube 12 cannot be inserted because the resin 31 for adhesion | attachment hardens | cures before a drawing process, it can prevent that the laminated composite pipe | tube 1 cannot be manufactured.
For example, as the adhesive resin 31, an epoxy resin, an acrylic resin, or a urethane resin that has 20 minutes or more until the start of curing can be used. Specifically, thermosetting epoxy resins, and among them, in the present embodiment, elastic epoxy resins are preferable from the viewpoint of adhesive strength.

(thickness)
The thickness of the resin layer 13 is preferably 0.01 mm or more and 10 mm or less. As a result, the metal outer tube 11 and the resin inner tube 12 are joined more firmly, and the metal outer tube 11 and the resin inner tube 12 are hardly separated even when used in a general mechanical structure. If the thickness of the resin layer 13 is less than 0.01 mm, there is no significance in providing a resin layer between the metal outer tube 11 and the resin inner tube 12 in terms of adhesive strength. On the other hand, when the thickness of the resin layer 13 exceeds 10 mm, it becomes difficult to arrange the resin inner tube and the metal outer tube on the same axis.

<Tension>
The laminated composite pipe 1 is obtained by making a laminated composite by tightening the outer peripheral face of the resin inner pipe 12 on the inner peripheral face of the metal outer pipe 11 to be the same or slightly. In order to ensure this lamination and combination, the tension of the inner peripheral surface of the metal outer tube 11 with respect to the outer peripheral surface of the resin inner tube 12 is important.
Since the tension of the inner peripheral surface of the metal outer tube 11 with respect to the outer peripheral surface of the resin inner tube 12 is the same as the proof strength of the metal outer tube, it is necessary to select the material and tempering of the metal outer tube according to the application. is there.

  Next, when inserting into the metal outer tube | pipe 11, applying the adhesive resin 31 to the outer surface of the resin inner tube | pipe 12 in the insertion application | coating process S102 mentioned later in this embodiment, it uses together with the postscript drawing apparatus 60 mentioned later. A preferred insertion device 50 will be described. This insertion device 50 can naturally be used when the resin inner tube 12 is inserted into the metal outer tube 11 in the insertion step S102a.

[Insertion device]
As shown in FIGS. 1A and 2, an insertion device 50 that is preferably used when inserting the resin inner tube 12 into the metal outer tube 11 and applying the adhesive resin 31 to the resin inner tube 12 is as follows. The fixing portion 50A for fixing the metal outer tube 11 and the moving portion 50B for moving the resin inner tube 12 are provided. As shown in FIGS. 1 to 4, the moving part 50B moves (extrudes) the resin inner tube 12 rotating around the central axis in the direction of the metal outer tube 11 in parallel with the central axis. A rotating roller 52 that rotates while supporting the resin inner tube 12 that rotates around the central axis on the side surface, and a carriage 54 that includes the rotating roller 52 at the top are provided. The fixed portion 50A includes a rotation roller 53, and the rotation roller 53 rotates while rotating, and the resin inner tube 12 inserted into the metal outer tube 11 contacts the metal outer tube 11 to rotate around the central axis as a rotation axis. 11 is supported on the side.

The rotary feed roller 51 is installed with its vertical and horizontal positions adjusted so as to maintain a predetermined angle with respect to the central axis of the metal outer tube 11 and the central axis of the resin inner tube 12. The rotary roller 52 and the rotary roller 53 are installed with their vertical and horizontal positions adjusted so that the central axis of the metal outer tube 11 and the central axis of the resin inner tube 12 substantially coincide. Further, there is no particular limitation on the order of installation of the rotary feed roller 51, the rotary roller 52, and the rotary roller 53 with respect to the metal outer tube 11, but as shown in FIG. 2, from the mouthed portion 21 side of the metal outer tube 11, The rotating roller 53, the rotating roller 53, the rotating feed roller 51, and the rotating roller 52 are preferably installed in this order.
The rotation feed roller 51 faces the open end 22 side of the metal outer tube 11 supported by the rotation roller 53 of the fixed portion of the insertion device 50 and uses the coating device 55 in the insertion coating step S102 described later. It is preferable to install the adhesive resin 31 at a position where it does not interfere with the application of the adhesive resin 31, specifically at a position where it does not contact the coating device 55.

(Rotary feed roller)
The operation of the rotary feed roller 51 is roughly divided into three. First, the operation of converting a part of the rotational force into the pushing force will be described below.
The rotary feed roller 51 is a cylinder (not shown), a cone (not shown), or a truncated cone shape as shown in FIGS. 3 (a) and 3 (b). As rotatable. As shown in FIGS. 3A and 3B, the rotary feed roller 51 supports the resin inner tube 12 on its outer peripheral surface with its side surface (inclined surface) as a contact surface. Further, the rotary feed roller 51 is installed so that the rotation axis thereof maintains a predetermined angle with respect to the insertion direction of the resin inner tube 12 (the central axis of the resin inner tube 12). And it is preferable that the two rotational feed rollers 51 are installed so as to have a predetermined interval as one set. This predetermined interval is an interval that can be supported by the contact inclined surface of the rotary feed roller 51 so as to be sandwiched from the side surface below the resin inner tube 12. In addition, the direction of the (one set) rotary feed roller 51 in the case of a conical shape or a truncated cone shape is preferably opposite to each other as shown in FIG. As a result, the resin inner tube 12 can be stably held. It should be noted that there is no problem even if the pair of rotary feed rollers 51 abut against each other as long as they function.

Further, the rotary feed roller 51 is installed so that the rotation axis thereof is maintained at a predetermined angle with respect to the insertion direction of the resin inner tube 12 (center axis of the resin inner tube 12). A part of the rotational force with the central axis of the tube 12 as the rotational axis is converted into a moving force in substantially the same direction as the central axis of the resin inner tube 12 in proportion to the predetermined angle.
In this way, the rotary feed roller 51 reduces the resistance when the resin inner tube 12 is inserted into the metal outer tube 11, and makes it easy to apply the adhesive resin to the outer peripheral surface of the resin inner tube 12 to be described later. Therefore, there is an effect of converting a part of the rotational force of the resin inner tube 12 into a moving force (pushing force) in substantially the same direction as the central axis of the resin inner tube 12 without hindering the rotation of the rotating resin inner tube 12. Have.

As shown in FIG. 3A, the rotary feed roller 51 is installed so that the angle θ of the rotary shaft of the rotary feed roller 51 with respect to the central axis (traveling direction) of the resin inner tube 12 is larger than 0 degree and smaller than 90 degrees. Preferably it is done. A more preferable angle θ is 10 degrees or more and 45 degrees or less. Further, it is preferable that the central axis of the pair of rotary feed rollers 51 is parallel. As a result, the resin inner tube 12 rotates stably and moves (is pushed out) toward the metal outer tube 11.
In the case where the rotary feed roller 51 has a conical or truncated cone shape, the direction of the rotary feed roller 51 is not limited. However, in order to stabilize the rotation of the resin inner tube 12, the rotation feed roller 51 is preferably installed so that the apexes face in opposite directions.

  Next, as a second action of the rotary feed roller 51, there is an action of converting a part of the moving force (pushing force) into a rotating force. That is, the rotary feed roller 51 is installed so that the rotation axis thereof is maintained at a predetermined angle with respect to the insertion direction of the resin inner tube 12 (the central axis of the resin inner tube 12). A part of the moving force (pushing force) in the substantially same direction as the central axis of the tube 12 is converted into a rotational force in proportion to the predetermined angle.

  The arrangement of the rotary feed roller 51 and the like is the same as described above, and instead of rotating the resin inner tube 12 around its central axis as a rotation axis, the resin inner tube 12 is pushed out to the resin inner tube 12 in the direction of its central axis (the moving force is changed). To give a part of the pushing force (moving force) in substantially the same direction as the central axis of the resin inner tube 12 can be converted into a rotational force. With this action, the resin inner tube 12 can be rotated while being pushed out (moved) and inserted from the open end 22 side of the metal outer tube 11.

  Further, as a third action of the rotary feed roller 51, the rotary feed roller 51 rotates about its central axis as a rotary shaft, so that the resin inner pipe 12 placed (contacted) on the rotary feed roller 51 is brought into contact. There exists an effect | action which gives both the moving force to the central-axis direction, and the rotational force to the circumferential direction simultaneously. That is, the rotary feed roller 51 is installed so that the rotation axis thereof is maintained at a predetermined angle with respect to the insertion direction of the resin inner tube 12 (center axis of the resin inner tube 12). The rotational force with the shaft as the rotational axis is proportional to the predetermined angle with respect to the resin inner tube 12, and the rotational force of the resin inner tube 12 and the moving force in the same direction as the central axis of the resin inner tube 12 (extrusion) Power).

  The arrangement of the rotary feed roller 51 and the like is the same as that described above, and the resin inner tube placed (contacted) on the rotary feed roller 51 by rotating the rotary feed roller 51 by using an arbitrary driving means such as a motor. It is possible to give both a rotational force that rotates the central axis as a rotational axis and a moving force that moves toward the outer metal tube. By this action, the resin inner tube 12 can be rotated and moved to be inserted from the open end 22 side of the metal outer tube 11.

(Rotating roller)
The rotating roller 52 supports the resin inner tube 12 on the outer peripheral surface thereof regardless of the rotation state of the resin inner tube 12.
As shown in FIGS. 1A, 2, and 3, the rotating roller 52 has a columnar shape and can rotate around the central axis thereof. The rotating roller 52 supports the side surface of the rotating roller 52 in contact with the outer peripheral surface of the resin inner tube 12. The two rotating rollers 52 are set as one set on the carriage 54 (on the top) so as to sandwich the resin inner tube 12 while making each central axis parallel to the center axis of the resin inner tube 12. By installing the two rotating rollers 52 as a set, it is possible to support the inner resin tube 12 so as to be sandwiched from the lower side surface thereof. The pair of rotating rollers 52 may be installed with a space therebetween or may be in contact with each other.

  The rotating roller 52 installed with such a structure is rotatable and supports the resin inner tube 12 on the outer peripheral surface serving as a contact surface regardless of the rotation state of the resin inner tube 12. The rotating roller 52 rotates to rotate the resin inner tube 12 to reduce resistance when the resin inner tube 12 is inserted into the metal outer tube 11, and to the outer peripheral surface of the resin inner tube 12 to be described later. The resin inner tube 12 is supported without hindering the rotation of the resin inner tube 12 for efficiently applying the adhesive resin. By supporting the rotating roller 52 so as to sandwich the resin inner tube 12, even if the resin inner tube 12 rotates, it can be stably supported.

(Cart)
As shown in FIGS. 1 (a) and 2, the carriage 54 is provided with the set of rotating rollers 52 at its upper portion so as to be rotatable, and the movement of a moving wheel or the like that moves on a rail (not shown) at the lower portion thereof. Means. The moving means of the carriage 54 can move at least in the direction of the rotation axis of the rotating roller 52, that is, in the direction of the central axis of the resin inner tube 12. Further, when the resin inner pipe 12 is placed on the rotary feed roller 51 and the rotary roller 52 provided on the upper part of the carriage 54, the central axis of the metal outer pipe 11 and the central axis of the resin inner pipe 12 substantially coincide with each other. It is preferable that the height be

Since the carriage 54 is provided with the rotation roller 52 at the upper part, the resin inner tube 12 supported by the rotation roller 52 moves in the central axis direction (insertion direction) regardless of the rotation state of the resin inner tube 12. Along with being inserted into the metal outer tube 11, the carriage 54 moves in the central axis direction (insertion direction) of the resin inner tube 12 by moving means such as a wheel while supporting the resin inner tube 12 via the rotating roller 52. Make it possible to do.
By using the carriage 54 provided with the rotating roller 52, it becomes easy to support the resin inner tube 12 and simultaneously insert it into the metal outer tube 11 while rotating the central axis as a rotation axis.

(Rotating roller)
The rotating roller 53 is supported on the outer peripheral surface regardless of the state of the metal outer tube 11.
The rotating roller 53 has a cylindrical shape similar to that of the rotating roller 52 as shown in FIGS. 1A, 2, and 3, and is rotatable about the central axis thereof. The rotating roller 53 supports the side surface of the rotating roller 53 in contact with the outer peripheral surface of the metal outer tube 11. Then, two rotating rollers 53 are installed as a set so as to sandwich the metal outer tube 11 while making each central axis parallel to the center axis of the metal outer tube 11. By installing two rotating rollers 53 as a set, it is possible to support the metal outer tube 11 so as to be sandwiched from the side surface below. The pair of rotating rollers 53 may be installed at intervals or may be in contact with each other.
The rotating roller 53 installed with such a structure is rotatable so as to reduce resistance when the resin inner tube 12 is inserted into the metal outer tube 11, and the resin inner tube 12 described later. In order to efficiently apply the adhesive resin to the outer peripheral surface, the metal outer tube 11 that is easily rotated by contact with the resin inner tube 12 that is inserted while rotating is stably supported without obstructing the rotation.

The rotary feed roller 51 preferably has a conical shape or a truncated cone shape because the contact area with the resin inner tube 12 increases and it becomes difficult to idle.
Further, the number and installation of the rotation feed roller 51, the rotation roller 52, the rotation roller 53, and the carriage 54 are not limited to those described above, and can be appropriately installed so that their functions are exhibited.
Furthermore, the size, fixing method, material, and the like of the rotation feed roller 51, the rotation roller 52, the rotation roller 53, and the carriage 54 can be selected as appropriate.

(Extruder)
An extruding device (not shown) is an optional component that pushes the resin inner tube 12 toward the metal outer tube 11 and inserts it into the metal outer tube 11. The type of the extrusion device is not limited as long as the resin inner tube 12 can be inserted toward the metal outer tube 11. For example, an air cylinder, an actuator, etc. are mentioned.

[Coating equipment]
As shown in FIGS. 1A and 2, the coating device 55 applies the adhesive resin 31 to the outer periphery of the resin inner tube 12. The coating device 55 is preferably used in combination with the insertion device 50 in the insertion coating step S102 described later.

The coating device 55 has a truncated cone shape, and has a hole in the center of the upper surface (small circle, reduced diameter) side that is larger than the outer diameter of the resin inner tube 12 and smaller than the inner diameter of the metal outer tube 11 and has a bottom surface (large circle) side. It is an open truncated cone-shaped member.
The diameter of the hole provided at the center on the upper surface (small circle, reduced diameter) side of the coating device 55 is preferably changed as appropriate according to the amount (thickness) of resin applied to the resin inner tube 12. Specifically, if the diameter of the hole of the coating device 55 exceeds 10 mm with respect to the outer diameter of the resin inner tube, a large amount of adhesive is required, which is not economical. For this reason, the diameter of the hole of the coating device 55 is preferably not less than the outer diameter of the resin inner tube 12 and not more than 5 mm. By doing so, it is possible to more uniformly apply a uniform adhesive. A more preferable diameter of the hole is not less than the outer diameter of the resin inner tube 12 and not more than 1.0 mm.

The coating device 55 is on an insertion path for inserting the resin inner tube 12 into the metal outer tube 11 and between the open end 22 side of the metal outer tube 11 and the resin inner tube 12. It is preferable that the open bottom (large circle) side of the device 55 can be installed toward the end surface of the resin inner tube 12.
For example, it is conceivable that the coating device 55 is attached to a movable arm.

  Furthermore, the hole may have a turn toward the bottom (large circle) side. The excess adhesive resin 31 is scraped off by the folded portion, thereby enabling efficient application.

  In addition, a drawing device (drawbench) 60 used when the metal outer tube 11 and the resin inner tube 12 are integrated in the present embodiment will be described.

[Drawing device (drawbench)]
A drawing device 60 (drawbench) used in a drawing step S104 described later includes a solid die 61 used for cold drawing shown in FIGS. 1B and 5, a carriage 62, and a mandrel 63 having a drawing plug at the tip. A general drawing device 60 having a mandrel extrusion cylinder 64 and the like can be used.

(Solid dice)
The solid die 61 reduces the diameter of the metal outer tube 11 in the cold drawing process (drawing process) in the drawing process S104. Depending on the shape of the solid die 61, the outer shape of the laminated composite pipe 1 can be various shapes and diameters. In the present embodiment, it is preferable that the cross-sectional shape of the reduced diameter surface of the solid die 61 is circular considering that the cylindrical laminated composite pipe 1 suitable for use in a rotating body is manufactured.
The material of the solid die 61 is appropriately selected according to the type of the metal outer tube 11, the amount of diameter reduction of the metal outer tube 11, and the finished outer diameter of the laminated composite tube 1 after cold drawing. For example, when an aluminum alloy tube is used as a metal outer tube, SKD is used for carbide or steel grade.

The diameter of the solid die 61 is a diameter that can be set as the outer diameter of the desired laminated composite pipe 1, and the inner diameter of the metal outer pipe 11 is 0% or more to the outer diameter of the resin inner pipe 12 after being reduced. It is preferable to use a diameter that can be reduced within a range of 5% or less.
For example, when the outer diameter of the resin inner tube 12 is 100 mm and the inner diameter of the metal outer tube 11 is 105 mm, when the thickness of the metal outer tube is 3 mm, the diameter of the solid die 61 is 105. 8 mm. As a result, the manufactured laminated composite tube 1 has an inner diameter of the metal outer tube 11 of approximately 99.9 mm, and the metal outer tube 11 and the resin inner tube 12 can be separated even when a force is applied up to σπd ² L by rotational torque. Therefore, the bonding strength is further increased.

(Withdrawal plug)
The drawing plug 63 is inserted into the resin inner tube 12 to support the metal outer tube 11 from the inside through the resin inner tube 12 when the diameter of the metal outer tube 11 is reduced in the cold drawing process (drawing process) in the drawing step S104. By doing so, the accuracy of the drawing process is improved. For this reason, it is preferable that the drawing plug 63 is used in the drawing process. However, the drawing plug 63 is not necessarily used in the drawing step S104.

In the present embodiment, in consideration of the tubular laminated composite tube 1 suitable for use in a rotating body, the shape of the extraction plug 63 is a conical shape whose diameter increases toward the entrance side of the solid die 61. preferable. Thereby, the processing precision of the surface of the metal outer tube | pipe 11 improves compared with the case where the metal outer tube | pipe 11 which inserted the resin inner tube | pipe 12 is emptied.
The diameter of the drawing plug 63 is set to be equal to or smaller than the inner diameter of the resin inner tube 12, and the material of the plug is preferably SKD.

(carriage)
The carriage 62 holds the mouthed portion 21 of the metal outer tube 11 inserted into the solid die 61 in the cold drawing process (drawing process) in the drawing step S104. Thereby, the laminated composite pipe | tube 1 is manufactured by drawing out the metal outer pipe | tube 11 with which the resin inner pipe | tube 12 was piled up.
In this embodiment, there is no restriction | limiting in particular in the structure and function, Arbitrary things can be used.

(Mandrel extrusion cylinder)
The mandrel extruding cylinder 64 pushes out the mandrel with the pulling plug 63 used when the pulling plug 63 is inserted into the resin inner tube 12 into the resin inner tube 12, and a general one can be used.

  Next, a method of manufacturing a laminated composite pipe using the drawing device 60 (drawbench) and the insertion device will be described with reference to FIGS.

(First embodiment)
[Production method]
As shown in FIG. 7, the manufacturing method according to the present embodiment first includes a mouth attaching step S101, an inserting step S102a, and a drawing step S104.

<Mouthing process>
The mouth opening step S101 shown in FIG. 7 is a contraction for gripping with the carriage 62 when the metal outer tube 11 into which the resin inner tube 12 is inserted is pulled out in the drawing step S104 described later as shown in FIGS. This is a step of providing a mouthed portion 21 which is a tube portion. In addition to the above-described role, this mouth opening step also serves to prevent the resin inner tube 12 from protruding or dropping from the metal outer tube 11 in the insertion step S102a (insertion coating step S102). 21 is provided.

The outer diameter of the lip portion 21 is smaller than the solid die diameter in order to pass the solid die 61 used in the drawing step S104 described later. The length of the lip portion 21 is also set to a length that allows the outer metal tube 11 into which the resin inner tube 12 is inserted to protrude from the solid die 61 and can be gripped by the carriage 62 in the drawing step S104 described later.
The metal tube 11 is contracted by a known method such as swaging or press working.

<Insertion process>
The insertion step S102a shown in FIG. 7 is a step of superposing the metal outer tube 11 and the resin inner tube 12 by inserting the resin inner tube 12 into the metal outer tube 11.

(Installation of metal outer pipe and resin inner pipe)
First, the metal outer tube 11 is placed on the two sets of rotating rollers 53 provided in the fixed portion 50 </ b> A of the insertion device 50. At this time, it is confirmed that the directions of the rotation axis (center axis) of the metal outer tube 11 and the rotation axis (center axis) of the rotation roller 53 substantially coincide with each other and the metal outer tube 11 rotates uniformly.
Next, the resin inner tube 12 is placed on the set of rotation feed rollers 51 provided in the moving unit 50 </ b> B of the insertion device 50 and the set of rotation rollers 52 provided in the carriage 54. At this time, the rotation axis (center axis) of the pair of rotary feed rollers 51 has the predetermined angle with the center axis of the resin inner tube 12, and the resin inner tube 12 rotates uniformly while the resin inner tube 12 rotates uniformly. Confirm that the tube 12 moves toward the metal outer tube 11.
Further, it is confirmed that the central axes of the metal outer tube 11 and the resin inner tube 12 are substantially coincident.

(Insert)
First, the resin inner tube 12 placed on the rotation feed roller 51 and the rotation roller 52 of the insertion device 50 is rotated by any means. As a result, the rotating feed roller 51 in contact rotates with the central axis as the rotation axis. The rotary feed roller 51 is installed so that the rotation axis thereof maintains a predetermined angle with respect to the insertion direction of the resin inner tube 12 (the central axis of the resin inner tube 12). A part of the rotational force having the central axis of 12 as a rotational axis is converted into a moving force in the same direction as the central axis of the resin inner tube 12 in proportion to the predetermined angle. The resin inner tube 12 placed on the contact slope is pushed toward the metal outer tube 11 in the direction of the central axis by this moving force. Utilizing this, the resin inner tube 12 is inserted into the metal outer tube 11. At this time, the carriage 54 moves in the direction of the metal outer tube 11 with the movement of the resin inner tube 12.

  There is no particular limitation on the rotating means of the resin inner tube 12, and it may be manual or a rotational power source such as a motor. Further, the resin inner tube 12 may be rotated by rotating the rotating roller 52 on the carriage 54 by any means.

  As preparation for insertion of the resin inner tube 12 into the metal outer tube 11, control of the straightness of the inner peripheral surface of the metal outer tube 11 and honing of the inner surface are unnecessary. Further, it is not necessary to control the straightness and outer diameter accuracy of the outer surface of the resin inner tube 12. Further, it is not necessary to match the bending directions of the metal outer tube 11 and the resin inner tube 12. Thereby, compared with the case of manufacturing the laminated composite pipe 1 by the conventional press-fitting method of the resin inner pipe 12, it is possible to achieve a significant improvement in the working speed by about three times.

  Up to this point, the method of inserting by rotating the resin inner tube 12 using the insertion device 50 has been shown, but a method of using another action of the rotary feed roller 51 is also possible. That is, the resin inner tube 12 is pushed out toward the metal outer tube 11 using the insertion device 50, or the cylindrical, conical, or truncated cone-shaped rotary feed roller 51 is rotated about its central axis as a rotation axis. Thus, a moving force in the central axis direction of the resin inner tube 12 may be applied while rotating the resin inner tube 12 supported by the contact surface. Also by this method, the resin inner tube 12 can be inserted into the metal outer tube 11.

  As mentioned above, although the method of using the insertion apparatus 50 in insertion process S102a was shown, the apparatus etc. which can fix the metal outer pipe | tube 11 other than this, the said rotational feed roller 51, and the said coating apparatus 55 etc. Of course, the insertion step S102a can also be performed.

As shown in FIG. 8, the insertion step S102a replaces the insertion step S102a, and an insertion application step S102 in which a resin layer made of the adhesive resin 31 is provided between the metal outer tube 11 and the resin inner tube 12 included in this step. Is preferable.
Thereby, it is possible to improve the manufacturing speed of the laminated composite pipe by sequentially inserting into the metal outer pipe from the part where the resin has been applied while applying the adhesive resin to the outer peripheral surface of the resin inner pipe in the insertion coating step S102. . In addition, it is possible to more easily and reliably provide a resin layer having a uniform thickness between the outer metal tube and the inner resin tube without a gap.

<Insertion application process>
The insertion application step S102 shown in FIG. 8 is performed by inserting the resin inner tube 12 into the metal outer tube 11 while applying the adhesive resin 31 to the outer surface of the resin inner tube 12, as shown in FIG. 11 is a step of superposing the metal outer tube 11 and the resin inner tube 12 while providing the resin layer 13 made of the adhesive resin 31 between the resin 11 and the resin inner tube 12.
The operation in the insertion application step S102 includes an insertion operation and an application operation. The insertion work is the same as the work content of the insertion step S102a of the first embodiment.

(Coating work)
The application operation is an operation for applying the adhesive resin 31 to the entire outer peripheral surface of the resin inner tube 12. This will be described in detail below.

(Installation of application equipment)
The coating device 55 is installed between the metal outer tube 11 placed on the insertion device 50 and the resin inner tube 12. At this time, the coating device 55 is installed such that the open bottom surface (large circle) side faces the end surface of the resin inner tube 12 on the metal outer tube 11 side.
Further, when the resin inner tube 12 is inserted into the metal outer tube 11, the center of the metal outer tube 11 is arranged so that the center axis of the metal outer tube 11 and the center axis of the resin inner tube 12 substantially coincide with each other. It is preferable that the vertical and horizontal positions are adjusted and installed so that the center of the coating device 55 comes on the shaft and the central axis of the resin inner tube 12.

(Application)
In the present embodiment, the application of the adhesive resin 31 to the outer peripheral surface of the resin inner tube 12 is performed by rotating the resin inner tube 12 using the insertion device 50 while the resin inner tube 12 is moved to the metal outer tube 11. The resin inner tube 12 is passed through the adhesive resin 31 held in a cylindrical shape by the coating device 55 installed on an insertion path for inserting the resin inner tube 12 into the metal outer tube 11. The adhesive resin 31 is preferably applied to the outer peripheral surface of the inner tube 12.

  The method of holding the adhesive resin 31 to the coating device 55 is not limited as long as the adhesive resin 31 is held by the coating device 55. For example, the adhesive resin 31 is extruded or suspended from the upper side where the coating device 55 is opened by an arbitrary extrusion device or the like, or from the opening provided on the top of the coating device 55 to the inner surface side of the coating device 55. Alternatively, the adhesive resin 31 may be held by a human hand. Further, while the inner resin pipe 12 passes through the coating device 55, the adhesive resin 31 may be gradually pushed out or dropped to continue holding and replenishing the adhesive resin 31.

  The rotating means of the resin inner tube 12 is not particularly limited as described above including before and after the application of the adhesive resin 31 from before the insertion of the resin inner tube 12 to the metal outer tube 11 until after the insertion. It may be rotated manually or may be rotated using a rotational power source such as a motor. Further, the resin inner tube 12 may be rotated by rotating the rotating roller 52 on the carriage 54 by any means.

Further, the carriage 54 is not required to be supported because more than half of the resin inner tube 12 is inserted into the metal outer tube 11, or even if it is removed from the insertion path when it reaches a position in contact with the rotary feed roller 51. Good.
Then, after the resin inner tube 12 has passed through the coating device 55 and the application of the adhesive resin 31 to the resin inner tube 12 is finished, the coating device 55 is preferably removed from the insertion path. By continuing to rotate the resin inner tube 12 further, the entire resin inner tube 12 is completely inserted into the metal outer tube 11. At this time, it is preferable to rotate the resin inner tube 12 by bringing a rotating means into contact with the inner peripheral surface of the resin inner tube 12. Further, even if an amount of the bonding resin 31 more than the amount necessary for bonding protrudes from the end of the metal outer tube 11, no problem occurs in the manufacturing process and in the laminated composite tube 1.

(Application amount control)
The application amount of the adhesive resin 31 is controlled by passing a hole of the predetermined diameter of the application device 55 while rotating the resin inner tube 12 during application, thereby providing a predetermined thickness (amount) at the hole of the application device. It is preferable to carry out by scraping the excess adhesive resin 31 and attaching it to the periphery of the hole. At the same time, by passing the resin inner tube 12 through a hole having a predetermined diameter of the coating device 55, the bonding resin 31 is uniformly adhered to the outer peripheral surface of the resin inner tube 12 by the hole portion of the coating device 55. The resin 31 can be applied.
As a result, the filling rate of the adhesive resin 31 in an arbitrary cross section of the laminated composite pipe 1 manufactured according to the present embodiment can be 90% or more.

<Drawing process>
In the drawing step S104 shown in FIG. 7, the outer diameter of the resin inner tube 12 is reduced by performing cold drawing (drawing) on the metal outer tube 11 in which the resin inner tube 12 is inserted to reduce the diameter of the metal outer tube 11. And the inner peripheral surface of the metal outer tube 11 are bonded and integrated to form a laminated composite tube 1.
An adhesive resin 31 may exist between the outer peripheral surface of the resin inner tube 12 and the inner peripheral surface of the metal outer tube 11. Further, the cold drawing process may be performed only once to make the outer diameter of the laminated composite pipe 1 a desired size, or the cold drawing process may be repeated several times until the outer diameter of the laminated composite pipe 1 becomes a desired size. May be performed.

(Installation)
First, as shown in FIG. 5A, the mouthed portion 21 of the metal outer tube 11 into which the resin inner tube 12 is inserted and overlapped is passed through the solid die 61 and fixed on the front bench of the drawing device 60. Next, the mouthed portion 21 protruding from the solid die 61 is gripped by the carriage 62. Then, as shown in FIGS. 5B and 5C, the outer metal tube 11 in which the inner resin tube 12 is inserted is cold-worked under the conditions described later so that the outer metal tube 11 and the inner resin tube 12 are coaxial. Perform drawing.
In addition, when the adhesive resin 31 exists between the inner peripheral surface of the metal outer tube 11 inserted and overlapped with the resin inner tube 12 and the outer peripheral surface of the resin inner tube 12, the resin outer tube 11 is drawn into the metal outer tube 11. Even if the adhesive resin 31 protrudes from the open end 22 side, no problem occurs in the manufacturing process and in the laminated composite pipe 1.

(Tightening allowance)
The tightening margin at the time of drawing by cold drawing is important because it determines the crimping rate of the metal outer tube 11 and the resin inner tube 12.
The fastening allowance is preferably an amount to reduce the diameter in the range of 0% to 0.5% of the inner diameter of the processed metal outer tube with respect to the outer diameter of the resin inner tube. Thereby, the filling rate of the resin layer can be 90% or more, and the bonding strength can be improved.

  If the tightening allowance exceeds 0.5% of the outer diameter of the resin inner tube after cold drawing, the drawing rate of the metal outer tube 11 becomes high, and the surface of the metal outer tube 11 is likely to be wrinkled. Further, when the diameter reduction process is performed by cold drawing, the resin inner pipe is over-tightened, and the resin layer of the resin inner pipe is cracked, which increases the possibility of reducing the strength of the resin inner pipe.

As described above, the method for manufacturing a laminated composite pipe according to this embodiment has excellent effects as described below.
With the method for manufacturing a laminated composite pipe according to this embodiment, a long laminated composite pipe in which a metal outer pipe and a fiber reinforced resin inner pipe are uniformly joined and integrated can be manufactured at low cost and with high efficiency by cold drawing. Become. In addition, the fiber-reinforced resin inner pipe can be quickly inserted into the metal outer pipe, thereby making it possible to manufacture at a lower cost and with higher efficiency. Furthermore, it becomes possible to easily and reliably provide a resin layer having a uniform thickness between the metal outer tube and the resin inner tube without a gap. At the same time, it is possible to improve the manufacturing speed of the laminated composite pipe by sequentially inserting the adhesive resin on the outer peripheral surface of the resin inner pipe while inserting the resin into the metal outer pipe. And it becomes possible to manufacture a laminated composite pipe with high precision and high efficiency.

The laminated composite pipe according to this embodiment has surface treatment characteristics, high rigidity, light weight, and low rotational moment of inertia characteristics.
Thereby, unlike the steel member with a conventional weight, the member using the laminated composite pipe according to the present embodiment can be easily replaced. In addition, it is possible to easily manufacture a member having a size and rigidity larger than those of a conventional iron member, and it is also possible to easily manufacture a member equal to or more than the conventional member having metal characteristics other than iron. For this reason, it can be optimally used for various rolls such as a transfer roll and a paper feed roll of a large printing press, as well as long and large diameter members that rotate at high speed.
Furthermore, by making use of the plastic workability, ductility, and conductivity of metal and the light weight, high strength, and high elasticity of FRP, the laminated composite pipe according to this embodiment is not limited to large machines, It can also be used optimally for pole materials and supports of transport machines and play equipment such as masts and boat oars.
And the lamination | stacking composite pipe is spread | diffused and the said apparatus and member using a laminated | multilayer composite pipe are also spread | diffused.

  Hereinafter, the clad tube and the manufacturing method thereof according to the second embodiment will be described. In addition, the same code | symbol is attached | subjected to the element same as above-described 1st Embodiment, and the overlapping description is abbreviate | omitted.

(Second Embodiment)
In the present embodiment, as shown in FIG. 9, the open end 22 side of the metal outer tube 11 in which the resin inner tube 12 is inserted is squeezed by a drawing process between the insertion coating step S102 and the drawing step S104. In S104, there is a removal prevention step S103 for providing a reduced diameter portion for preventing the resin inner tube 12 from coming out.
Thereby, it is possible to reliably prevent the resin inner tube 12 from being pulled out when performing cold drawing on the metal outer tube 11 in which the resin inner tube 12 is inserted in the drawing step S104, and the production efficiency of the laminated composite tube 1 is further improved. improves.

<Prevention prevention process>
The drawing process in this step can be performed by a known means. Further, the drawing amount is arbitrary as long as it is possible to prevent the resin inner tube 12 from coming out.
Furthermore, the prevention preventing step S103 can be provided between the insertion step S102a and the drawing step S104.

  Hereinafter, a cladding tube and a manufacturing method thereof according to a modified example different from those of the embodiments will be described. In addition, the same code | symbol is attached | subjected to the element same as these embodiment, and the overlapping description is abbreviate | omitted.

In the present embodiment, the type of the adhesive resin 31 used in the coating operation in the insertion coating step S102 of the first embodiment may be an electrically conductive resin.
Thereby, the resin layer provided between the metal outer tube 11 and the resin inner tube 12 has electrical conductivity. A laminated composite tube 1 is obtained. This laminated composite tube 1 improves the electrical conductivity between the metal outer tube 11 and the resin inner tube 12, makes it easier to ground during surface treatment, etc., and rotates when the laminated composite tube 1 is used as a rotating body. It becomes easy to prevent the body from being charged.

(Electrical conductivity)
The electric conductivity of the adhesive resin used in the present embodiment is preferably 1 × 10 ³ S / m or more and 1 × 10 ⁶ S / m or less, and any of epoxy resin and urethane resin can be used. This facilitates surface treatment such as electroplating and electrodeposition coating, and electric welding.

(thickness)
The thickness of the resin layer 13 made of an electrically conductive resin is preferably 0.01 mm or more and 10 mm or less, as in the first embodiment. Thereby, it becomes possible to join the metal outer tube 11 and the resin inner tube 12 more firmly while having electrical conductivity. In addition, the metal outer tube 11 and the resin inner tube 12 are difficult to separate even when used in a general machine structure. If the thickness of the resin layer 13 is less than 0.01 mm, there is no significance in providing a resin layer between the metal outer tube 11 and the resin inner tube 12 in terms of adhesive strength. On the other hand, when the thickness of the resin layer 13 exceeds 10 mm, the electrical conductivity of the resin layer 13 decreases. At the same time, it becomes difficult to hold the resin inner tube and the metal outer tube on the same axis and complete the bonding.

  In the present embodiment, as shown in FIG. 6D, the cross-sectional shapes of the inner peripheral surface of the metal outer tube 11 and the outer peripheral surface of the resin inner tube 12 of the first embodiment may be polygonal shapes instead of circles.

(Cross-sectional shape)
The cross-sectional shape perpendicular to the central axis of the inner peripheral surface of the metal outer tube 11 and the outer peripheral surface of the resin inner tube 12 enlarges the joint area between the inner peripheral surface of the metal outer tube 11 and the outer peripheral surface of the resin inner tube 12. As a result, the joint force between the metal outer tube 11 and the resin inner tube 12 increases, and the presence of a portion (side) that prevents slipping causes torque to be mutually applied when the laminated composite tube 1 is used as a tubular rotating member. It is important for effective transmission.

In the present embodiment, it is preferable that the cross-sectional shape is a polygonal shape such as a triangle, a quadrangle, a hexagon, or an octagon. As the metal outer tube 11b, a metal outer tube having a polygonal inner peripheral surface can be used by a known processing method such as drawing. As the resin inner tube 12b, not only a resin tube manufactured as a polygonal tube from the beginning, but also a resin tube having a circular tube whose outer peripheral surface is formed by a known processing method can be used.
And this laminated composite pipe can transmit torque reliably when used for a tubular rotary member by making the shape of the joint surface of the metal outer pipe and the resin inner pipe into a polygonal shape, and it can be reduced in weight and mechanically. Excellent.

  In this embodiment, as shown in FIG. 6E, the cross-sectional shapes of the inner peripheral surface of the metal outer tube 11 and the outer peripheral surface of the resin inner tube 12 of the first embodiment are replaced with circles to have fitting portions. It does not matter as a shape.

(Cross-sectional shape)
The cross-sectional shape of the inner peripheral surface of the metal outer tube 11 and the outer peripheral surface of the resin inner tube 12 is increased by increasing the joint area between the inner peripheral surface of the metal outer tube 11 and the outer peripheral surface of the resin inner tube 12. And it is important in the point which the joining force of the resin inner pipe | tube 12 increases, and the point which transmits a torque effectively when using the laminated composite pipe 1 for a tubular rotary member by having a fitting part.

The metal outer tube 11c in the present embodiment has one or more recesses or projections extending in the longitudinal direction on the inner circumferential surface thereof, and corresponds to the recesses or projections extending in the longitudinal direction on the outer circumferential surface of the resin inner tube 12c. It shall have one or more convex parts or concave parts, and the concave parts and the convex parts can be fitted.
By fitting the metal outer tube 11c and the resin inner tube 12c, it becomes easy to transmit force in the circumferential direction of the laminated composite tube 1 by the fitting portion.

In this embodiment, you may provide the electrode part used at the time of the surface treatment of the metal outer tube | pipe 11 in the edge part of the metal outer tube | pipe 11 of 1st Embodiment.
Thereby, the laminated composite pipe 1 is securely connected during surface treatment such as electroplating and electrodeposition coating, and surface treatment performed by electrically connecting objects to be treated such as electric welding. Is possible. In addition, when the laminated composite pipe according to the present embodiment is incorporated in a large apparatus, a machine, or the like, it becomes possible to prevent the laminated composite pipe from being charged by facilitating grounding.

(shape)
When the metal outer tube 11 is inserted into the resin inner tube 12 in the insertion coating step S102 or the insertion step S102a, the electrode portion is connected to the bending start portion tube end of the metal outer tube 11 on the mouthed portion 21 side. It is preferable to provide 5 to 50 mm from the inner end of the metal outer tube 11 and leave 5 to 50 mm from the tube end of the resin inner tube 12 on the open end side. However, the electrode portion is not limited to this, and may be optional as long as it can be connected to a device used for surface treatment. For example, a clip, a hanger, or an aluminum wire is mentioned.

Note that the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the technical idea of the present invention.
For example, when a plurality of sets (pieces) of the rotary feed rollers 51 are installed, the rotary rollers 52 may not be used alone but may be used alone. In this case, it is also possible to install the rotation roller 52 so that the center axis (rotation axis) thereof is approximately 90 degrees with the center axis (rotation axis) of the resin inner tube 12.

The direction of the two rotary feed rollers 51 as one set is that the apex of the cone or the top of the truncated cone (the small circle on the upper surface, the reduced diameter direction) is the insertion direction of the resin inner tube 12 (or the insertion direction). Can be installed in the opposite direction. In this case, the rotation feed roller 51 (set) has a predetermined interval, and the bisector of the angle formed by the rotation axis (center axis) and the center axis of the resin inner tube 12 substantially coincide with each other. It is preferable to be installed in Thereby, both rotation and insertion of the resin inner tube 12 are stabilized.
Further, the two rotary feed rollers 51, which are one set, can be installed so that the rotation axes thereof coincide with each other on substantially the same straight line. Furthermore, it may have a shape in which a cone or two truncated cones are joined together at the apex (portion) so as to be concentric from the end portion toward the center portion and the diameter gradually decreases.
The number of the rotational feed rollers 51 is not necessarily one set, and may be one. As shown in FIG. 3 (c), the rotary feed roller 51 exhibits its function and function even when the central axis (rotary axis) of the resin inner tube 12 is installed at the approximate center of the contact slope of the rotary feed roller 51. Is possible. In this case, the angle θ of the rotation shaft of the rotary feed roller 51 with respect to the central axis (traveling direction) of the resin inner tube 12 is preferably set so as to be larger than 0 degree and smaller than 90 degrees. More preferred. By installing the rotary feed roller 51 in this way, it is possible to rotate the resin inner tube 12 while moving (pushing it out).

A support device in which the rotation shaft is not fixed, such as a support device using a rotatable sphere as an alternative to the columnar rotation roller 52 and the rotation roller 53, may be used. The carriage 54 may be provided with these.
The coating device 55 is not limited to a truncated cone shape, and may have a cylindrical shape or a rectangular tube shape as long as the coating device 55 has a hole that is greater than the outer diameter of the resin inner tube 12 and less than the inner diameter of the metal outer tube 11 and can hold the adhesive resin 31. It is also possible to use a truncated pyramid shape.

Instead of using the insertion device 50 in the insertion coating step S102 or the insertion step S102a, a device capable of fixing the metal outer tube 11 and a device including the rotary feed roller 51 and the coating device 55 are used. It is naturally possible to perform the insertion coating step S102.
It is possible to perform the drawing step S104 immediately after the end of the insertion coating step S102 or the insertion step S102a, and the outer metal layer 12 inserted and overlapped in the insertion coating step S102 or the insertion step S102a. It is also possible to draw a plurality of tubes 11 together in the drawing step S104.

DESCRIPTION OF SYMBOLS 1 Laminated composite pipe | tube 11,11b, 11c Metal outer pipe | tube 12,12a, 12b, 12c Resin inner pipe | tube 13 Resin layer 21 Portioned part 22 Open end 31 Resin 50 Inserting device 50A Fixed part 50B Moving part 51 Rotating feed roller 52 Rotating roller 53 Rotating roller 54 Carriage 55 Coating device 60 Drawing device 61 Solid die 62 Carriage 63 Pull-out plug and mandrel bar 64 Mandrel extrusion cylinder S101 Mouth application step S102 Insertion step S102a Insertion step S103 Stopping step S104 Drawing step

Claims (13)

In a method for producing a laminated composite pipe comprising a metal outer pipe made of metal and a resin inner pipe made of fiber-reinforced resin installed coaxially inside the metal outer pipe,
A mouth opening step for squeezing one end of the metal outer tube to provide a mouth opening portion;
An insertion step of inserting the resin inner tube into the metal outer tube from an open end provided on the opposite side of the metal outer tube with the mouth portion;
By pulling out the metal outer tube with the resin inner tube inserted through a solid die and reducing the inner diameter of the metal outer tube, the inner peripheral surface of the metal outer tube and the outer peripheral surface of the resin inner tube are reduced. A drawing process in which cold drawing is performed so as to closely adhere and stack and integrate on the same axis;
The manufacturing method of the laminated composite pipe | tube characterized by including. The drawing process includes
The method for producing a laminated composite pipe according to claim 1, wherein the inner diameter of the metal outer pipe is reduced in a range of 0% to 0.5% with respect to the outer diameter of the resin inner pipe. The insertion step includes
A rotary feed roller having a contact surface parallel to the rotation axis or a contact surface inclined with respect to the rotation axis is brought into contact with the resin inner tube, and the resin inner tube is rotated about its central axis as a rotation axis. The laminated composite pipe according to claim 1 or 2, wherein the laminated composite pipe is inserted from the open end side of the metal outer pipe while being pushed out toward the metal outer pipe via the rotary feed roller. Method. The insertion step includes
A rotary feed roller having a contact surface parallel to the rotation shaft or a contact surface inclined with respect to the rotation shaft is brought into contact with the resin inner tube, and the resin inner tube is pushed out toward the metal outer tube. 3. The resin inner tube is inserted from the open end side of the metal outer tube through the rotary feed roller while rotating with the central axis as a rotation axis. Manufacturing method of laminated composite pipe. The insertion step includes
A rotary feed roller having an abutment surface parallel to the rotation axis or an abutment surface inclined with respect to the rotation axis is brought into contact with the resin inner tube, and the rotation feed roller is rotated about its central axis as the rotation axis. Thus, the resin inner tube is inserted from the open end side of the metal outer tube by rotating the resin inner tube around the central axis and moving the resin inner tube toward the metal outer tube. The manufacturing method of the laminated composite pipe | tube of Claim 2.   The insertion step is an insertion application step of inserting a resin inner tube from an open end side of the metal outer tube while applying an adhesive resin to an outer surface of the resin inner tube. 6. A method for producing a laminated composite pipe according to 5.   In the insertion step, the adhesive inner tube is bonded to the outer peripheral surface of the inner resin tube by penetrating an adhesive resin held in a cylindrical shape by a container installed on an insertion path for inserting the inner resin tube into the outer metal tube. The method for producing a laminated composite pipe according to any one of claims 1 to 5, wherein the process is an insertion coating process in which a resin for application is inserted from an open end side of the metal outer pipe. A laminated composite pipe manufactured by the manufacturing method according to any one of claims 1 to 7,
In a laminated composite pipe comprising a metal outer pipe made of the metal and a resin inner pipe made of a fiber reinforced resin installed coaxially inside the metal outer pipe,
A laminated composite pipe, wherein the metal outer pipe is formed of any one of aluminum, copper, titanium, stainless steel, and brass. A laminated composite pipe manufactured by the manufacturing method according to any one of claims 1 to 7,
The laminated composite pipe according to claim 8, wherein the resin inner pipe is a carbon fiber reinforced resin pipe having one layer or two or more layers. A laminated composite pipe manufactured by the manufacturing method according to any one of claims 1 to 7,
The laminated composite pipe according to claim 8 or 9, further comprising a resin layer between the metal outer pipe and the resin inner pipe. A laminated composite pipe manufactured by the manufacturing method according to any one of claims 1 to 7,
The laminated composite pipe according to any one of claims 8 to 10, wherein a resin layer between the metal outer pipe and the resin inner pipe is an electrically conductive resin. A laminated composite pipe manufactured by the manufacturing method according to any one of claims 1 to 7,
The cross-sectional shape of the inner peripheral surface of the metal outer tube is a polygon, and the cross-sectional shape of the outer peripheral surface of the resin inner tube is a polygon corresponding to the cross-sectional shape of the inner peripheral surface of the metal outer tube. The laminated composite pipe according to any one of claims 8 to 11. A laminated composite pipe manufactured by the manufacturing method according to any one of claims 1 to 7,
13. The laminated composite pipe according to claim 8, wherein an electrode part used for surface treatment is provided at an end of the metal outer pipe.

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