JPS6111245A - Method of molding double layer cylindrical body for roller and roller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a method for creating a cylinder with a multi-layer structure in which the inner layer is reinforced with fiber-reinforced thermosetting resin (hereinafter referred to as FRP) and the outer layer is provided with an elastic material such as rubber. By utilizing the manufacturing method and the characteristics of the manufacturing method, we have expanded the scope of application of the manufacturing method by using a thermoplastic resin that is heated from the outside and softened for the outer layer material, and we have further expanded the scope of application of the manufacturing method. This relates to a roller using a cylindrical body made in the shape of a mold.

Conventionally, in order to manufacture rollers using rubber for the outer layer, rubber was baked onto the outer circumferential surface of a roller made of iron or the like, bonded, and then polished into the required shape and dimensions.

In this method, processing was very time consuming depending on the shape of the outer circumferential surface of the roller and was not economical.

In the present invention, the outer diameter and shape of the roller are secured at the time of molding the roller cylindrical body, and there is no need for post-processing of the outer periphery, making it suitable for mass production (very economical manufacturing method compared to conventional methods) It is.

The present invention will be described in detail below using an example.

Figure 1 shows an example in which an elastic material such as rubber is used for the outer layer.
It is a cylindrical body molded using FRP for the inner layer. Figure 2 shows a mold for centrifugal molding in which the cylindrical body shown in Figure 1 was formed.The mold body 8 can be divided into multiple pieces to take out the product after the inner layer of FRP2 has hardened. It has a sturdy structure that can withstand strong forces. The inner circumferential surface is made to have the necessary dimensions and shape required for the outer circumferential surface of the cylinder, and lids 4 are attached to both ends to prevent the pRP injected inside from leaking to the outside. FIG. 3 shows the elastic body 7 made of rubber or the like that is a right cylindrical outer layer material used in FIG. 1 before molding. The manufacturing method is that after assembling the mold body 8, the outer layer material 7 is placed inside and then the FR is placed inside.
After inserting the reinforcing fiber, which is the material of P, attaching the lid 4, rotate the entire mold, inject the thermosetting resin through the resin injection port 5, and continue rotating, and the centrifugal force will cause the mold body 8 to rotate. The outer layer material 7 is deformed until it comes into close contact, resulting in something like the one shown in FIG. Reference numeral 6 denotes small air vent holes for allowing the outer layer material to adhere tightly to the inside of the mold body 3 due to centrifugal force, and a large number of holes are provided as necessary. If both the outer layer material and the inner layer material harden at room temperature, they can be left as is, but if the material requires heating, the entire mold can be heated inside the mold, and the desired cylinder can be obtained by heating only the resin. .

Similarly, when using a thermoplastic resin for the outer layer member 1, the entire mold is heated, and the resin is heated and softened before being put into the mold body 8.

This heat can also be used as a heat source for oxidizing thermosetting resin.

The cylindrical body molded by the above method can accurately reproduce the dimensions and shape of the mold body 8, so if sufficient care is taken in manufacturing the mold body 8, most of the outer periphery of the cylindrical body made by this method will require post-processing. You get what you don't. Furthermore, even if the outer periphery is not a perfect circle due to centrifugal processing, if it is a regular polygon as shown in FIG. 4, a cylindrical body with uniform wall thickness and good rotational balance can be obtained.

As is clear from the above description, the present invention is an economical invention that is effective for mass production of predetermined cylindrical bodies. Furthermore, by applying an adhesive having good affinity with the thermosetting resin to the inside of the outer layer material and molding it, a strong cylindrical body with good integrity and no misalignment between the inner layer and the outer layer can be obtained. If the outer layer material does not have sufficient flexibility, after injecting the thermosetting resin, increase the internal pressure of the mold with air, etc. as shown in Figure 2, so that the outer layer material adheres to the inside of the mold body 8. Get better.

If the outer layer material is spongy, a treatment or film may be added to prevent the thermosetting resin from penetrating the inner surface of the material.

As an example, the maximum diameter IQ of the central part of the shape shown in FIG.
When manufacturing a cylindrical body for a roller with a diameter of 7wn and a minimum diameter of 10105y at both ends, a soft natural rubber tube with an inner diameter of IQOwn and a wall thickness of 2mm is used as the outer layer material, and glass cloth and unsaturated polyester resin are used as the FRP material. The dimensions of the mold were 2 mm thicker in diameter and 520 mm in length, taking into account curing shrinkage of the resin. After injection, the mold was cured at room temperature by keeping the rotation speed at about 80 rpm, and the rotation was stopped at about 80 rpm. We were able to obtain a multi-layer cylinder with the same dimensions and shape. Furthermore, flanges were fitted on both sides of the cylinder to use it as a roller. When a vinyl chloride pipe is used as the outer layer member, the pipe is
Soften the mold body 8 with warm water of 001r to about 6 degrees
It was manufactured while being heated to 0C. Since this method requires high temperatures, the blending ratio of the curing agent in the thermosetting resin was decreased in accordance with the temperature. In addition, when manufacturing extremely high-precision rollers, a roller with extremely good rotational balance can be obtained by slightly modifying the outer diameter of the roller manufactured according to the present invention.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a cylinder made according to an embodiment of the present invention, ■ is an outer layer member made of an elastic material such as rubber, and 2 is an inner layer material FRP.
It is. FIG. 2 shows a mold for centrifugal molding, where 3 is the mold body, 4 is a lid, 5 is a resin injection port, and 6 is a small hole for air venting. FIG. 8 is a sectional view of the outer layer material 7. FIG. 4 is a side view of a regular polygonal cylinder made according to the present invention.

Claims (1)

[Claims] 1. In a method for manufacturing a cylindrical body having a multi-layer structure in which the outer layer is made of an elastic material such as rubber and the inner layer is a fiber-reinforced thermosetting resin, the previously produced outer layer material is used to form a cylindrical body. A method for molding a multilayer cylinder for a roller, which comprises slowly inserting it into a centrifugal mold and centrifugally molding a fiber-reinforced thermosetting resin inside the outer layer, and a roller 2, and a centrifugal method according to claim 1. During molding, the outer layer member is elastically deformed by the sum of the centrifugal forces of the outer layer member and the inner layer member, and the deformation of the outer layer portion is maintained by the thermosetting property and strength of the inner member. 3. The outer layer member according to claim 1 is made of a thermoplastic resin instead of an elastic body such as rubber, heated to soften it and become deformable, and then loosely inserted into a cylindrical centrifugal mold and centrifugally formed. Something. 4. In the centrifugal molding according to claims 1, 2, and 3, the shape and dimensions of the inner surface of the mold can be accurately reproduced on the outer periphery of the cylinder. 5. According to claims 1, 2, 3, and 4, the outer layer of the cylindrical body is provided with continuous or discontinuous grooves, recesses, and protrusions. 6. A cylindrical body centrifugally formed by any one of claims 1, 2, 3, 4, and 5, or by the method described in 2 or more claims, is adopted as the roller cylinder part.