JP3253758B2 - Manufacturing method of rod material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a rod material.

[0002]

2. Description of the Related Art Conventionally, when manufacturing this kind of rod material,
As a prepreg, for example, a reinforcing material such as carbon fiber impregnated with a thermosetting resin such as phenol is wound around a mandrel to form a rod material, and a polyester as a binding body for molding is formed on the outer peripheral surface of the rod material. Alternatively, a molded tape such as polypropylene is wound in a spiral shape and fired as a hardening treatment. After firing, the formed tape is peeled off, and the outer peripheral surface of the rod material from which the formed tape has been peeled is subjected to an appropriate finishing process. Had been painted. As a finishing process, generally, as shown in FIG. 6, a centerless polishing machine 8 is used to remove a spiral projection attached to the surface of the rod material with a molding tape and to smooth the surface.
Polishing process was performed.

[0003]

As shown in FIG. 8, the helical projection formed on the rod material by the molding tape is compressed by the tape from where the molding tape is wound. This shows a state where the smooth surface 5A is continuous in a step-like manner, and the step-like step portion forms the protrusion 5C. Therefore, in order to smooth the surface of the rod material 5 by polishing, it is necessary to completely cut off the protrusion 5C having a mountain-shaped cross section from the skirt portion thereof as shown in the figure. Then, the reinforcing fiber deformed in a state along the shape of the protrusion 5C formed by the double winding of the molding tape 6 is also scraped off together with the protrusion 5C, and the reinforcing fiber is cut at the portion to be cut off, The fiber reinforcement function did not work well. In addition, the smooth surface 5A of the projection 5C, which is compacted by the tape, is inclined with respect to the outer surface of the rod which is expected to be a gentle cone, so that the entire surface of the rod material has a gentle conical surface. Required a large amount of shaving allowance, which required a thicker coating layer.

[0004] An object of the present invention is to set the surface of a rod material after hardening treatment to a form different from the conventional one, so that finishing processing can be easily performed without causing cutting of a reinforcing fiber, and a coating layer can be formed. It is an object of the present invention to provide a method of manufacturing a rod material that can be made thin and can easily and quickly perform a winding operation of a prepreg and a binding body.

[0005]

According to a feature of the present invention, a rod material is formed by winding a prepreg comprising a reinforcing fiber and a resin around a cored bar, and the prepreg and the binding member for molding are substantially identical. The united product formed by superimposing in the widthwise state is spirally formed along the rod axis direction so as to be in a butt state in which side ends adjacent to each other in the rod axis direction of the united object abut against each other. After winding to form the outermost layer and firing, the binding member is peeled off, and the operation and effect are as follows.

[0006]

In other words, when a prepreg made of reinforcing fibers and resin and a binding body for molding are overlapped with approximately the same width, and a united product is spirally wound along the rod axis direction. On the other hand, the outermost layer is formed by winding so that the side ends adjacent to each other in the rod axis direction of the union are in contact with each other, and then the baking body is peeled off by firing. The surface of the rod material pressed by this binding body presents a smooth surface, and each smooth surface formed along the rod axis direction is located on substantially the same gentle conical surface. Due to the above, at the contact portion between the side ends of the united product, the leaked resin forms a small annular convex portion, or the small annular concave portion where the ends of the binding members slightly overlap each other. Form. Therefore, since these annular uneven portions are not formed avoiding the tightening force of the binding body,
It is smaller than the smooth surface by the binding body, and it is not necessary to consider the uneven surface when grinding each smooth surface,
Originally, each smooth surface is substantially on the same gentle conical surface, so that the cut amount required for grinding can be reduced.

[0007] Here, since the prepreg in a surface state that is easy to adhere and the binding body for molding are overlapped to form a combined product, handling is easy if the binding body portion of the combined product is handled with the front side. In addition, in the combined product, the binding body has a tensile strength enough to tighten the rod material, and the prepreg also has a large tensile strength due to the reinforcing fibers, so that when it is wound around the rod material. In addition, a higher tensile strength can be applied than in the conventional case where the prepreg is wound alone, and the wound state of the prepreg is further tightened.

[0008]

As a result, since a projection having a mountain-like cross section is not formed on the surface of the rod material as in the prior art, the amount of finishing treatment is small, and damage to the reinforcing fibers can be avoided.
Thereby, the diameter of the resin after firing as the rod material is not reduced, and the desired strength of the rod as the rod material is maintained because the reinforcing fibers remain at present.

In addition, the handling of the prepreg to be wound is easy, so that the workability can be improved, and the strength of the rod material itself can be increased because the prepreg is wound in a strong state. There is also an advantage that the outermost prepreg and the binding body can be completed in one step.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a method of forming a rod using a cored bar 1 will be described step by step. As shown in FIG. 1, a sheet-shaped prepreg 4 having a certain width in which carbon-based reinforcing fibers 2 are aligned in the circumferential direction and the reinforcing fibers 2 are impregnated with an epoxy-based thermosetting resin 3 as a first layer. Wrap around cored bar 1. As shown in FIG. 1, a carbon-based reinforcing fiber 2 is aligned in the axial direction, and a sheet-shaped prepreg 4 having a constant width in which the reinforcing fiber 2 is impregnated with an epoxy-based thermosetting resin 3 is a second layer. Wrap as In order to wind each of the above-mentioned layers around the core bar 1, the prepreg 4 is set on a surface plate, one end of the prepreg 4 is heated, the core bar 1 is placed, and the prepreg 4 is wound around the core bar 1 and formed. I do. As shown in FIG. 2, a prepreg tape 4 in which carbon-based reinforcing fibers 2 are further aligned in the circumferential direction and the reinforcing fibers 2 are impregnated with an epoxy-based thermosetting resin 3 is used as a third layer. A polyester tape 6 as a binding body having the same width as 4 is overlapped to form a united product 9, and the united product 9 is wound on the second layer,
The rod material 5 is formed. A release agent such as silicon is sandwiched between the polyester tape 6 and the prepreg tape 4. As shown in FIG. 2, the united product 9 is wound while giving an appropriate tension to the united product 9, and the rolled and formed rod material 5 is placed in a hot-air firing furnace 7 as shown in FIG. 3. Put and bake. After the firing, as shown in FIG.
Is cut to a predetermined length and subjected to the following finishing.
As shown in FIG. 5, the surface of the rod material 5 from which the polyester tape 6 has been peeled off has a smooth surface 5 which is tied up by the polyester tape 6 and has a constant width along the axis of the rod.
A and a ring portion 5B having a width smaller than that of the smooth surface 5A are alternately positioned to form the surface of the rod material 5. The ring portion 5B becomes a convex portion or a concave portion depending on the state at the time of winding. As shown in FIG. 6, the surface of the rod material 5 is polished by a centerless polishing machine 8 to a substantially gentle conical surface, and then the surface of the rod material 5 is painted using a painting method such as ironing. Form.

[Other Embodiments] As the prepreg 4, other thermosetting resins can be used, and if circumstances permit, a thermoplastic resin can be used. As the reinforcing fiber 2, glass other than carbon fiber can be used. Fibers and boron fibers can be used. Although the prepreg 4 is wound in a plurality of layers, the prepreg with the glass cloth applied inside may be wound in a single layer, and the direction of the reinforcing fibers 2 is not limited to the above, and at least only the first layer 2 may be wound around. If the direction is set, the second layer 3 and the third layer 4
May be any of the circumferential direction and the axial direction. The prepreg 4 may be not only one in which the reinforcing fibers 2 are arranged in one direction, but also one in which the reinforcing fibers 2 are arranged in an orthogonal state. For finishing, see Centerless Polishing Machine 8
However, the polishing may be performed by spraying an abrasive onto the surface of the rod material 5 and is not limited to polishing by the centerless polishing machine 8. In the process of winding the polyester tape 6 around the rod material 5 and performing the curing treatment, a configuration may be adopted in which the resin is cured by heating near normal temperature without baking depending on the type of resin.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1A is a perspective view showing a state in which a first layer and a second layer are wound around a mandrel. FIG. 1B is a perspective view showing a rod material after winding.

FIG. 2 is a perspective view showing a state in which a prepreg tape and a polyester tape are superposed and wound.

FIG. 3 is a side view showing a state in which the rod material is fired.

FIG. 4 is a side view showing a state where the polyester tape is peeled off.

FIG. 5 is a side view showing a state after the polyester tape is peeled off.

FIG. 6 is a perspective view showing a state in which a rod material is polished.

7A is a partially enlarged longitudinal sectional side view in FIG. 5; FIG. 7B is a partially enlarged longitudinal sectional side view showing a state in which polishing is performed from the state of FIG.

FIG. 8 (a) is a partially enlarged longitudinal side view showing a state after peeling of a conventional polyester tape (b) is a partially enlarged longitudinal side view showing a state after polishing is performed from the state of (a).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core metal 2 Reinforcing fiber 3 Resin 4 Prepreg 5 Rod material 5A Smooth surface 5B Ring part 6 Binding body 9 Combined material

Claims (1)

(57) [Claims] A prepreg (4) comprising a reinforcing fiber (2) and a resin (3) is wound around a cored bar (1) to form a rod material (5), and is formed together with the prepreg (4). A joint body (9) formed by superposing with the binding body (6) having substantially the same width is abutted such that side ends of the combined body (9) adjacent to each other in the rod axis direction come into contact with each other. A method of manufacturing a rod material in which the outermost layer is formed by spirally winding along the rod axis direction so as to be in a state, and after firing, the binding body (6) is peeled off.