JPS6013816B2 - Mandrel for manufacturing tapered pipe material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mandrel for manufacturing a tapered tube material having a non-circular cross section for use in fishing rods, golf club shafts, and the like.

In general, it is convenient for the shafts of fishing rods and golf clubs to have an oval or other non-circular cross section.This makes it easier to grip the fishing rod, and also allows the long axis to be oriented toward the front and back of the transfer direction when transferring. By doing
It is possible to reduce the resistance of the fishing rod and set the direction of the fishing rod at the time of transfer, making it possible to cast the line accurately and over a long distance. By swinging the ball back and forth in the forward and backward direction, the flight distance of the ball can be extended, and by swinging the light shaft back and forth in the adjacent direction, the shaft is given directionality and the ball can be swung accurately. It can be flown to a certain position.

By the way, when manufacturing tapered tubes with a non-circular cross section, such as fishing rods and golf shafts, conventionally a mandrel consisting only of a tapered portion with a non-circular cross section has been used, so it is generally difficult to manufacture circular tapered tubes. However, it is not possible to mechanically roll a mandrel on a molding table and, during this rolling, apply prepreg, which is made by impregnating high-strength fibers with synthetic resin, around the outer periphery of the mandrel while applying pressure. First, wrap the prepreg manually around the outer periphery of the tapered mandrel with a non-circular cross section, fix the prepreg in multiple places with adhesive, hold it on the outer periphery of the mandrel, and press the press metal in this state. The idea was to apply pressure using a mold or the like.

Therefore, in order to manufacture a tapered pipe material with a non-circular cross-section as described above, it is necessary to wind the prepreg around a mandrel through tedious manual work, and to pressurize the prepreg using a press mold or the like. This made the manufacturing process complicated and time-consuming, making the manufactured pipe materials expensive.

The present invention was devised in view of the above-mentioned problems.In order to manufacture a tapered pipe material having a non-circular cross section, a maso-drel is mechanically rolled on a forming table, and during this rolling, a mandrel is We have developed a mandrel that can be manufactured automatically by mechanical force by automatically winding Buripreg while applying pressure around the outer circumference of the tube, and which can automatically and extremely easily and accurately manufacture tapered pipe material with a non-circular cross section by mechanical force. The mandrel body has a non-circular cross section in the middle and tapers from one lengthwise end to the other.A small diameter taper part and a large diameter taper part have a circular cross section and a tapered shape at both lengthwise ends of the mandrel body. This is characterized in that the main body is made rollable by each tapered part.

The mandrel of the present invention will be described below based on embodiments shown in the drawings.

The mandrel of the present invention is a mandrel 1 as shown in FIGS. 1 to 7, and this mandrel 1 is provided with a non-circular part 11 having an elliptical cross-section and a tapered shape in the middle part, and a small diameter of the non-circular part 11. A small-diameter tapered portion 12 is formed at the side tip portion with a perfect circle in cross section and a tapered surface with a small diameter tip on the outer peripheral surface, and at the other end on the large side of the non-circular portion 11, a portion with a perfect circle in cross section and an outer circumferential surface is formed. A large tapered portion 13 is formed on the surface, which has a tapered surface toward the side of the non-circular portion 11 and has one tapered surface having the same inclination angle as one tapered surface of the small diameter tapered portion 12.

Further, the maximum axis DI of the small-diameter side end of the non-circular portion 11 is made the same as the large-side diameter tl of the small-diameter tapered portion 12, and the long axis D2 of the large-side end of the non-circular portion 11 is set as The outer circumferential surface of the non-circular portion 11 in the long axis direction is made to be the same as the diameter t2 of the large diameter taper part 13 on the 4/flea side, and the outer circumferential surface of the large diameter taper part 13 is changed to the outer circumferential surface of the small diameter taper part 12. are continued at the same inclination angle, and the short rattan d of the non-circular part 11 is the same at any cross-sectional location,
The short axis d of the bracket is made to be the same as the diameter tl of the large diameter side of the small taper portion 12 as much as possible, and the outer circumferential surface of the non-circular portion 11 in the short rattan d direction is continuous with the outer circumferential surface of the small diameter tapered portion 11. This is done in order to converge to the same condition.

By forming the mandrel 1 as described above, the tapered portions 12 and 13 provided at both ends of the mandrel 1 are brought into contact with the forming table described later, and the mandrel 1 is smoothly transferred on the forming table while drawing a circular trajectory. The prepreg can be automatically wrapped around the mandrel during this transfer, and the prepreg wrapped around the mandrel can be
After heating, it can be easily pulled out from the small diameter tapered portion 12 side of the mandrel.

However, the outer circumferential surface of the non-circular portion 11 in the short width d direction is
It may be formed into a tapered shape so that the large tapered portion 13 side is tapered as long as it does not protrude outward from the line connecting each of the tapered portions 12 and 13. The work of pulling out the prepreg from the mandrel becomes easier than in the case described above.

The prepreg is then automatically wound using the mandrel loop formed as described above and the forming apparatus 2 shown in FIG.

The molding device 2 has a molding table 22 made of an elastic material such as synthetic resin or rubber installed on a frame 21, and a movable metal molding table 22 placed at a predetermined distance above the molding table 22. It is configured by providing a pressing table 23.

Then, by pinching the mandrel between the molding table 22 and the pressing table 23 of the molding device 2 and moving the pressing table 23, the tapered portions 12 and 13 provided at both ends of the mandrel are molded. The mandrel 1 can be brought into contact with the molding table 22 and rolled smoothly on the molding table 22 while drawing a circular trajectory.During this rolling, phenol, polyester, and epoxy are applied to high-strength fibers such as glass and carbon. A prepreg 3 impregnated with a synthetic resin such as the like is supplied, and the prepreg 3 is automatically wound around the outer periphery of the mandrel 1.

At the time of winding the prepreg 3, since the forming table 22 is made of a European material, the pressing force of the pressing table 23 causes
The prepreg 3 wound around the mandrel 1 is pressurized to some extent, but the pressing force in the direction of the minor axis d of the mandrel 1 tends to be insufficient. Therefore, after the prepreg 3 is wound around the mandrel 1, A thin sheet such as cellophane, polyester tape, or heat shrink tube is wrapped around the outer periphery of the prepreg 3, and the prepreg 3 is brought into close contact with the mandrel 1 under pressure. Thereafter, the prepreg 3 wound around the mandrel 11 is fired and heated in a firing furnace, and then the prepreg 3 is pulled out toward the small tapered portion 12 of the mandrel 1, the sheet is peeled off, and a ninth sheet is formed. As shown in the figure, a tube material 4 having an elliptical cross section and a tapered shape is formed. As explained above, if a tapered tube with a non-circular cross section is manufactured using the mandrel of the present invention, a tapered tube with a non-circular cross section can be automatically wound very easily and accurately by mechanical force. The tube material can be manufactured labor-savingly and efficiently.

Moreover, since the pooper-shaped tube material formed by the mandrel of the present invention can have both lengthwise ends circular, for example, when used for a fishing rod, it can be used to connect a tail plug to a hand rod, or to connect a single rod in a joint rod. It also becomes possible to easily perform joining for splicing. In addition, since the tube material obtained by the present invention has a tapered shape with a non-circular cross section, when the tube material is used as a fishing rod, it fits easily in the hand and is easy to grip. This makes it possible to reduce the resistance of the fishing rod and set the direction when transferring the fishing line, making it possible to cast the fishing line accurately and over long distances.

Furthermore, when used in the shaft of a golf club, by swinging the long axis forward and backward in the swinging direction, the strength of the shaft can be increased and the flight distance of the ball can be increased.
By directing the short axis forward and backward in the direction of swing, the shaft is given directionality, allowing the ball to fly to an accurate position.

[Brief explanation of the drawing]

1 to 7 show one embodiment of the mandrel of the present invention.
The figure is a side view of the mandrel viewed from the short axis direction, Figure 2 is a side view of the mandrel viewed from the same long axis direction, and Figures 3 to 7 are the first side view of the mandrel.
8 is a side view of a forming apparatus used in conjunction with the mandrel of the present invention, and FIG. 9 is a sectional view of a tube material formed using the mandrel of the present invention. It is a slope view. 1...Mandrel, 12...Part of small diameter taper, 11...
・...Non-circular part, 13......Daikai taper part, 22...
...Molding table, 3...Prepreg, 4...Pipe material. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] 1 A mandrel for manufacturing a tapered pipe material with a non-circular cross section by wrapping a prepreg made of high-strength fibers impregnated with a synthetic resin, with a non-circular cross section in the middle part and a mandrel with a non-circular cross section in the middle part and from one end in the length direction to the other end. A small-diameter taper portion and a large-diameter taper portion each having a tapered shape with a circular cross section are formed at both ends in the length direction of the mandrel body, which is tapered toward the other side, and each of these tapered portions enables the main body to roll. Mandrel for manufacturing tapered pipe material.