JPH0565949U - Composite roll - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a composite roll which can prevent deterioration in adhesion between an FRP inner cylinder and a metal shell and can be stably used for a long period of time. [Structure] An FRP inner cylinder having a concave portion on its surface is covered with a metal shell, and when the shell is drawn, the shell is drawn into the concave portion to obtain a composite roll in which the inner cylinder and the shell are mechanically coupled.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a composite roll of fiber reinforced plastic (FRP) and metal, which can be preferably used in a manufacturing device of synthetic resin film, cloth, paper, metal foil and the like, a printing device and the like.

[0002]

[Prior Art]

 For example, in the manufacturing process of synthetic resin film, it is lightweight, has low inertia and excellent conformability, has a smooth surface and does not scratch the film, has excellent abrasion resistance and can be used stably for a long period of time. Need a roll.

Conventionally, such rolls are mostly made of metals such as stainless steel and aluminum alloys. This is because metal is easy to work smoothly and has excellent wear resistance. However, such a metal roll has a problem that the followability is poor due to its large weight and large inertia. Another problem is that the replacement work is troublesome due to the large weight. Therefore, in recent years, more lightweight FRP-based rolls have been studied.

Such rolls mainly composed of FRP are disclosed, for example, in Japanese Patent Publication No. 59-45843, Japanese Utility Model Publication 63-69812, Japanese Utility Model Publication No. 63-101324, and Japanese Patent Application No. 2-88087. The specification describes a compound roll in which an FRP inner cylinder is covered with a metal shell. In each of these composite rolls, most of the required mechanical properties such as strength and rigidity are taken care of by the FRP inner cylinder to reduce the weight, and the surface of the roll is made of metal. The FRP inner cylinder is covered with a metal shell by press fitting or drawing by electromagnetic processing. However, in such a conventional roll, since the thermal properties of FRP and metal are greatly different, the adhesion between the FRP inner cylinder and the metal shell deteriorates after repeated expansion and contraction, which is remarkable. In some cases, there is the problem of slippage. Further, since the FRP inner cylinder and the metal shell differ in the degree of stress relaxation, even after use at room temperature, the adhesion will still deteriorate when used for a long period of time.

[0005]

[Problems to be solved by the device]

 The object of the present invention is to solve the above-mentioned problems of the conventional composite roll, prevent a decrease in adhesion between the FRP inner cylinder and the metal shell, and enable stable use for a long period of time. In providing composite rolls.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention has a main body in which a fiber reinforced plastic inner cylinder is covered with a metal shell, and a header attached to each end of the main body. There is provided a composite roll having a concave portion in which the shell is narrowed down. In addition, the inner cylinder and the shell may be bonded together. Further, the recess may be formed as a groove extending in the axial direction and / or the circumferential direction of the inner cylinder, or may be formed by knurling. The composite roll of the present invention is an FRP inner cylinder that is responsible for most of the mechanical properties such as bending strength, bending rigidity, and compressive strength required for the roll, and a metal shell that exhibits the features of the metal roll described above. It has a roll body including and.

The inner cylinder is made of FRP as described above. As the reinforcing fiber in the FRP, carbon fiber, glass fiber, aramid fiber, or other high-strength, high-modulus fiber can be used. Although carbon fiber is most preferable, it may be used in combination with other reinforcing fiber such as glass fiber or aramid fiber. Further, as the matrix resin, thermosetting resin such as epoxy resin and unsaturated polyester resin can be used.

The FRP inner cylinder contains reinforcing fibers arranged at an angle of ± 0 to 30 ° with respect to the longitudinal direction, or reinforcing fibers arranged at an angle of ± 0 to 15 ° with respect to the longitudinal direction. And reinforcing fibers arranged at an angle of ± 80 to 90 ° with respect to the longitudinal direction. By arranging such reinforcing fibers, mechanical properties such as bending strength, bending rigidity, and compressive strength of the inner cylinder, and by extension, the composite roll, are greatly improved. Although the amount of reinforcing fiber varies depending on the length and diameter of the composite roll, the use, etc., it is preferably about 45 to 70% by volume. When carbon fiber is used as the reinforcing fiber, the inner cylinder becomes conductive, and electrolytic corrosion with the metal shell may become a problem. In such a case, an FRP layer or synthetic resin layer made of non-conductive fiber such as glass fiber, aramid fiber or polyethylene fiber is interposed between the inner cylinder and the shell to electrically insulate the both. To do. When the inner cylinder and the shell are bonded together, the adhesive may have that function.

The inner cylinder has a thickness of about 2 to 10 mm, although it depends on the length and diameter of the composite roll, the use, and the like. The surface has a recess formed during molding or by cutting after molding. The concave portion is a groove having a width of 0.5 to 3 mm and a depth of 0.3 to 2 mm that extends in the axial direction of the inner cylinder, the circumferential direction including a spiral shape, or both the axial direction and the circumferential direction. You can Further, it may be a knurled pattern formed by knurling. A metal shell is squeezed into this recess as described later.

The FRP inner cylinder as described above can be easily formed by a well-known filament winding method as a FRP forming method, a sheet wrapping method using a prepreg, or the like.

On the other hand, the shell is made of metal such as stainless steel, aluminum alloy, and copper. This metal shell mainly provides the composite roll with the characteristics of a metal roll. As described above, the FRP inner cylinder is mainly responsible for the mechanical properties of the composite roll, so the shell may be thin. Although it depends on the material, etc., it may be about 0.2 to 3 mm.

As the header, a metal one made of aluminum alloy, carbon steel, iron-chromium alloy, stainless steel or the like is usually used. It may be integrated with the rotary shaft as a composite roll, or may be a separate body. Then, the header is fitted and attached to each end of the roll body composed of the inner cylinder and the shell. In this case, an adhesive is usually used together.

When the FRP inner cylinder is covered with a metal shell and drawn, the shell comes into close contact with the inner cylinder. At this time, an adhesive such as a synthetic resin may be used together.

The drawing process is preferably performed by an electromagnetic processing method. In this method, electromagnetic coils are arranged so as to surround the work piece, a current is momentarily applied to the electromagnetic coil to create a strong magnetic field, and the repulsive magnetic field due to the eddy current induced in the work piece is used. The FRP inner cylinder is covered with a metal shell, an electromagnetic coil is placed outside the shell, and a current is applied to the electromagnetic coil to create a magnetic field, which is induced in the shell. Using the repulsive magnetic field due to the eddy current, the shell is deformed to the inner cylinder side, and the inner cylinder is tightly attached so as to be tight. At this time, the shell is squeezed so as to fit into the recess of the inner cylinder. As a result, the shell is mechanically connected to the inner cylinder. In this process, the inner cylinder and the shell are intermittently moved, for example, from one end to the other end so that the narrowing is performed sequentially. The inner cylinder and the shell may be fixed and the electromagnetic coil may be moved intermittently. The header may be attached to the inner cylinder before processing or may be attached to the roll body after processing.

After the metal shell is brought into close contact with the FRP inner cylinder, irregularities on the shell surface formed during the drawing process are corrected by using a lathe or the like, and further polishing is performed. That is, finishing processing is performed to obtain a composite roll. If necessary, surface treatment such as hard chrome plating may be applied.

[0016]

Embodiment

 In FIGS. 1 and 2, a roll body 1 has an FRP inner cylinder 2 and a metal shell 3 covering the inner cylinder 2, and metal headers 4 and 4 are attached to the ends thereof. ing. The inner cylinder 2 has two grooves 5, 5 extending in the axial direction on the surface thereof, and the shell 3 is narrowed in the grooves 5, 5.

[0017]

【Example】

 An FRP inner cylinder having an inner diameter of 95 mm and an outer diameter of 105 mm was obtained by a filament winding method using a carbon fiber yarn “Torayca” M40 yarn manufactured by Toray Industries, Inc. and an epoxy resin. Regarding the layer structure, the inner layer was a ± 90 ° hoop wound layer (thickness: 2 mm), and the outer layer was a ± 10 ° helical wound layer (thickness: 4 mm). The carbon fiber content in this inner cylinder was 65% by volume.

Next, after cutting and polishing the inner cylinder so that the outer diameter is 104 mm, a groove having a width of 2 mm and a depth of 0.5 mm extending in the axial direction is used with a grindstone as shown in FIG. As shown, it was formed symmetrically in two places in the circumferential direction.

Next, the inner cylinder was covered with a cylinder made of an aluminum alloy having an inner diameter of 104.5 mm and an outer diameter of 106.5 mm, which was a shell, and was subjected to a drawing process by an electromagnetic machining method to obtain a roll body.

Next, after removing irregularities on the shell surface formed during drawing by grinding and polishing, metal headers were attached to both ends of the roll body to obtain a composite roll of the present invention.

With respect to the above composite roll, a twisting tester was used to measure the torque when the inner cylinder and the shell started to slide, but it did not slip even with a torque of 100 kgm. This value did not change even after standing for 500 hours.

[0022]

[Effect of the device]

 In the composite roll of the present invention, the metallic shell is squeezed into the concave portion of the surface of the FRP inner cylinder and the two are mechanically coupled, so that it is possible to prevent the adhesion between the two from decreasing, and for a long period of time. It can be used stably. Of course, since it is a roll mainly composed of FRP, it is light and easy to handle even if it is long and has a large diameter, and it has excellent followability because of its low inertia. In addition, since the surface is metal, it retains the features of a metal roll that is smooth and has excellent wear resistance.

[Brief description of drawings]

FIG. 1 is a schematic partial cross-sectional front view showing a composite roll according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 1: Roll main body 2: Fiber reinforced plastic inner cylinder 3: Metal shell 4: Header 5: Recess formed on the surface of the inner cylinder

Claims (4)

[Scope of utility model registration request] 1. A main body comprising a fiber reinforced plastic inner cylinder covered with a metal shell, and a header attached to each end of the main body, wherein the inner cylinder has a concave portion on its surface. A composite roll, wherein the shell is narrowed down in a recess. 2. The composite roll according to claim 1, wherein the inner cylinder and the shell are bonded together. 3. The composite roll according to claim 1, wherein the recess is a groove extending in the axial direction and / or the circumferential direction of the inner cylinder. 4. The composite roll according to claim 1, wherein the concave portion is formed by knurling.