JP3122918B2 - Method and apparatus for producing tapered tubular resin product - 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 and an apparatus for producing a tapered cylindrical resin product, and more particularly to a rod-shaped molded product having a small diameter and a small taper angle, such as a golf shaft or a fishing rod, or a large conical surface. The present invention relates to a molding technique of a tubular resin product made of a fiber-reinforced composite material suitable for obtaining a rod-shaped molded product having a taper angle.

[0002]

2. Description of the Related Art Conventionally, as a general device of this kind,
For example, the following are known. That is,
A tapered rod-shaped mandrel is tightly clamped between the substrate and the pressing plate, and the substrate is linearly translated in the plane thereof, while the pressing plate is centered on an axis extending in the moving direction of the substrate. , Are rotatably supported along the taper of the mandrel. Then, a fiber-reinforced composite sheet (hereinafter, referred to as a “prepreg sheet”) formed by impregnating fibers such as glass with a thermosetting resin is laid on a substrate, and a mandrel is placed on the upper surface in a moving direction of the substrate. The substrate is placed orthogonally, and the substrate is linearly moved in a predetermined direction while pressing the mandrel with a pressing plate. This allows the mandrel to roll on the upper surface of the substrate while contacting the outer peripheral surface of the mandrel with the prepreg sheet, so that the prepreg sheet can be pressed and laminated on the outer peripheral surface of the mandrel.

[0003]

The above mandrel is shown in FIG.
There is no particular problem in the case of a round bar shape without a taper as shown in FIG. 5, but in the case of an elongated conical shape having a gentle taper as shown in FIG. 5, when the substrate is moved linearly, the mandrel rotates and the Attempts to roll in an arc around the apex of the cone. However, in the conventional apparatus, since the substrate and the pressing plate can move only linearly, there is a possibility that a large frictional slip of the prepreg sheet occurs between the substrate and the pressing plate, and furthermore, a portion where the diameter of the mandrel is small. The prepreg sheet is separated from the outer peripheral surface of the prepreg sheet and floats up, the fibers constituting the prepreg sheet are broken, and there is a possibility that the strength of the molded product is reduced and the quality of the molded product is reduced.

[0004] In particular, in order to obtain a product having an inner reinforcing layer, when a mandrel having a taper angle different in two or more steps, for example, as shown in FIG. The prepreg sheet is loosely wound around the steeply tapered portion where the taper is large, and the quality of the molded product may be greatly deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems. When a cylindrical resin product is molded using a tapered mandrel, a thermosetting material such as a prepreg sheet is formed around the mandrel. It is an object of the present invention to provide a method and an apparatus for manufacturing a tapered cylindrical resin product which can press and stack resin sheets without loosening, thereby improving the quality of a molded product. Still another object of the present invention is to provide a method and an apparatus for manufacturing a tapered tubular resin product capable of laminating a thermosetting resin sheet on a mandrel having a plurality of gradually tapered mandrels without loosening.

[0006]

According to the present invention, there is provided a method and apparatus for manufacturing a tapered tubular resin product according to the present invention, wherein a tapered mandrel is sandwiched between a substrate and a pressing plate. Then, a thermosetting resin sheet is supplied from a supply unit to the peripheral surface of the mandrel. The pressing plate is configured to rotate the substrate in a plane of the substrate around a predetermined first axis while tilting the substrate so as to follow the tapered surface of the mandrel, thereby rotating the mandrel around its axis. By rolling, the thermosetting resin sheet is laminated on the outer peripheral surface of the mandrel, and the laminated mandrel is taken out from between the substrate and the pressing plate and subjected to heat treatment.

[0007] The predetermined first axis may be an intersection of the axis of the mandrel and the substrate, for example, in the case of a conical mandrel, near a vertex of the cone. Note that the relative distance between the predetermined first support shaft and the substrate may be variable, and the distance between the predetermined first axis and the substrate may be freely set according to the taper of a mandrel.

The heat-cured thermosetting resin sheet can be used as a product together with the mandrel, or may be extracted from the mandrel and used as a product. In order for the push plate to follow the tapered surface of the mandrel, the push plate may be passively rotated around a second axis extending tangentially to the direction of rotation of the substrate, A passive rotation about a third axis substantially perpendicular to the axis and the substrate is also possible.

As the thermosetting resin used for the thermosetting resin sheet, if it is used for ordinary composite materials,
All of them can be used, and examples thereof include unsaturated polyester resins, vinyl ester resins, epoxy resins, phenol resins, furan resins, polyimide resins, and polycyanate resins. Among them, an epoxy resin composition is preferable because of high versatility.

Particularly, the thermosetting resin sheet is preferably a prepreg sheet formed by impregnating fibers with a thermosetting resin, depending on the purpose of use. The prepreg sheet is not particularly limited, and those conventionally used for composite materials can be used. Examples of the reinforcing fibers used in the prepreg sheet include inorganic or organic fibers such as glass fibers, aramid fibers, polyacrylonitrile-based carbon fibers, and pitch-based carbon fibers. In particular, when carbon fiber is used, it is lightweight and has high strength,
This is preferable because a molded article having a high elastic modulus can be obtained.

Examples of the form of the reinforcing fiber include a unidirectional material (usually the MD direction of the sheet and the machine direction), a plain woven fabric, a twill woven fabric, a triaxial woven fabric, a woven fabric such as a braided fiber, a nonwoven fabric, or a laminate thereof. Can be mentioned. In particular, the use of a unidirectional material is particularly preferable because the characteristics of the reinforcing fiber are easily exhibited and the design in the lamination direction is easily performed. The present invention
Among prepreg sheets made of thermoplastic resin or thermosetting resin reinforced with fibers, prepreg sheets obtained by impregnating fibers with thermosetting resin, especially thermosetting into one-directional fiber arrangement as the fiber arrangement direction A prepreg sheet impregnated with a resin is the most suitable.

The tapered mandrel is, besides a simple tapered rod-shaped body, a gently tapered portion having a taper of a relatively small angle, and a diametrically continuous portion connected to the small diameter end of the gently tapered portion. It may be a two-stage or more-stage tapered rod-like body having a sharp taper portion having a large angle taper. In the latter case, the thermosetting resin sheet is first laminated on the sharply tapered portion, and then the outer periphery of the small and sharply tapered portions is entirely laminated with the thermosetting resin sheet. In this case, it is preferable that the winding pressure of the large-diameter portion is larger than that of the small-diameter portion, and the lamination thickness of the small-diameter portion is larger than that of the large-diameter portion.

[0013]

Therefore, according to the above construction, the tapered mandrel is sandwiched between the substrate and the pressing plate, and while the thermosetting resin sheet is supplied to the peripheral surface of the mandrel, the substrate is moved to the predetermined first axis. Is rotated in the plane of the substrate. Then, the mandrel rolls around its axis due to the relative rotation between the substrate and the pressing plate, and the thermosetting resin sheet is laminated on the peripheral surface of the mandrel.

At this time, the mandrel has no substrate,
Assuming that the lower surface of the push plate simply rolls, it tries to roll in an arc around the convergent vertex on the extension of the tapered surface because of the tapered peripheral surface. On the other hand, since the mandrel performs the circular motion by the circular rotation of the substrate, there is no relative slip between the mandrel and the substrate. Preferably, the rotation of the substrate is such that when the first axis passing through the vicinity of the intersection of the axis of the mandrel and the base is the center of rotation, the rotation of the mandrel is less slippery, and the thermosetting resin sheet has wrinkles or wrinkles. Breakage is unlikely to occur. Therefore, it is preferable that the distance between the base and the predetermined first support shaft is freely adjustable, and the first support shaft is determined as much as possible at the convergent vertex of the tapered surface of the mandrel.

On the other hand, there are two methods for uniformly contacting the push plate with the tapered surface of the mandrel. That is, one is to passively rotate the push plate around a second axis extending tangentially to the direction of rotation of the base with respect to the tapered surface of the mandrel, In addition, passive rotation about a second axis and a third axis substantially perpendicular to the base is likewise passive with respect to the tapered surface of the mandrel. According to the former, when the second axis is substantially perpendicular to the axis of the mandrel in the rolling of the mandrel, the rotation of the push plate about the second axis is within the plane including the axis of the mandrel. As a result, the push plate is inclined almost exactly along the tapered surface of the mandrel. According to the latter, as the mandrel rolls, the push plate can be passively pivoted further around the third axis in accordance with the tapered surface of the mandrel, so that the second axis always rolls. The mandrel is oriented at right angles to the axis of the mandrel, and the push plate can be passively rotated about this second axis, so that the push plate is accurately positioned on its tapered surface over the entire rolling area of the mandrel. Can be along.

In the method according to the present invention, since a prepreg sheet is used as a thermosetting resin sheet, no stress is applied to the prepreg sheet in a required direction during molding, a carbon fiber having a high elastic modulus is used. However, a molded article having a light weight, high strength and high elastic modulus can be obtained. Therefore, since the strength of the cylindrical resin product is increased, it is suitable for a long cylindrical resin product such as a shaft of a golf club.

When the tapered mandrel is a rod-like body having two or more steps of taper, if a thermosetting resin sheet is laminated on the steep taper portion first, a large-angle steep taper portion is formed first. Since the thermosetting resin sheet is laminated, the sharp taper becomes a small angle, and the step with the small angle gentle taper becomes small or eliminated. Next, the outer peripheral surface is entirely continuous with the thermosetting resin sheet. It becomes possible to be laminated. This makes it possible to laminate the thermosetting resin sheet at the sharply tapered portion without causing any looseness in the sheet.

In this case, if the winding pressure of the large diameter portion is larger than that of the small diameter portion and the lamination thickness of the small diameter portion is larger than that of the large diameter portion, the larger winding pressure is smaller. Since the lamination thickness is smaller than the lamination thickness, the lamination thickness of the small diameter portion becomes large, and as a result, the step between the sharp taper portion and the gentle taper portion becomes smaller,
Therefore, it is possible to laminate the thermosetting resin sheets on the outer peripheral surface of the taper more smoothly and continuously as a whole.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a fan-shaped substrate 4 is rotated on a support shaft 2 erected on the upper surface of a base 1 via a connecting rod 3 extending in a radial direction from the upper surface of the base 1 in a horizontal plane including the substrate 4. The roller 5 is rotatably supported on the upper surface of the base 1 and supports the horizontal rotation of the substrate 4 from the lower surface. The board 4 is driven by the expansion and contraction movement of an actuator such as an air cylinder 6 whose both ends are supported by a part of the connecting rod 3 and a part of the base 1 to perform the horizontal rotation.

A push plate 10 faces above the substrate 4. The push plate 10 has a support shaft 11 fixedly provided on the upper surface thereof.
In addition, it is rotatably supported around it passively in response to an external force. The support shaft 11 is supported by a bearing 12 so as to be passively rotatable about its axis and an axis L extending upward at right angles to the substrate 4 in response to an external force acting on the push plate 10. The bearing 12 is supported by a support member 13 standing on the base 1, and is vertically operated to extend and contract at right angles to the support shaft 11 and the upper surface of the base 1.
It is connected to the output end of an actuator such as 14 and moves toward or away from the base 1.

Accordingly, the push plate 10 is supported by the bearing 12 so as to be rotatable substantially in parallel with the upper surface of the base 1 via the support shaft 11, and is moved closer to or away from the base 1 by the vertical moving air cylinder 14. It becomes possible. Note that, here, the support shaft 11 is a predetermined one on the arc AA line with respect to the arc AA line which is the rotation direction of the substrate 4 around the support shaft 2.
The point extends in the tangent line BB direction.

On the other hand, a prepreg sheet P is placed on the upper surface of the substrate 4, and a mandrel 20 made of an elongated frusto-conical bar having a small taper is mounted on the prepreg sheet P. It is placed so as to match the extending direction. The mandrel 20 is preferably arranged at a predetermined position such that the support shaft 2 is located near the intersection of the axis and the substrate 4 on the extension. This is to prevent the prepreg sheet P wound on the mandrel 20 from slipping between the substrate 4 and the pressing plate 10 as much as possible. For the same purpose, the connecting rod 3 may have a variable length. Thereby, the substrate 4
And the relative distance between the support shaft 2 and the support shaft 2 are variable.
Prepreg sheet P on the substrate 4 in the radial direction centered on
After mounting, the length of the connecting rod 3 is adjusted, so that the positional relationship between the mandrel 20 and the support shaft 2 can be easily adapted to the above requirements.

The prepreg sheet P is, as described above,
It is formed by impregnating a sheet of glass fiber, aramid fiber, carbon fiber, etc. with a thermosetting resin such as epoxy, polyester, vinyl ester, etc., the adhesiveness becomes appropriate at 30-40 ° C, and at 80-180 ° C It has the property of hardening. The prepreg sheet P may be cut continuously or in a fixed size from a separately prepared supply roll and supplied to the peripheral surface of the mandrel 20 each time.

In such a configuration, a tubular product made of a prepreg sheet having a frusto-conical surface with a small taper angle is formed as follows. First, a band-shaped or fan-shaped prepreg sheet P is laid on the upper surface of the substrate 4 from a supply means such as a supply roll, and a rod-shaped mandrel 20 is placed thereon such that the axis thereof is along the radial direction of the support shaft 2. further,
The prepreg sheet P is temporarily wound around the outer peripheral surface of the mandrel 20 by winding it at an appropriate center angle so that the prepreg sheet P is not separated from the outer peripheral surface of the mandrel 20. For example, in this temporary fastening operation, the prepreg sheet P is wound around the outer peripheral surface of the mandrel 20 for about half a turn, and the end of the prepreg sheet P is heated with an iron or the like at 30 to 40 ° C.
Fused on the outer surface of 20. The end of the prepreg sheet P may be adhered to the outer peripheral surface of the mandrel 20 with an adhesive or an adhesive tape.

Next, when the vertical moving air cylinder 14 is extended and the push plate 10 is lowered, the push plate 10 comes into contact with the mandrel 20 or the prepreg sheet P wound on the outer surface of the mandrel 20. Then, the prepreg sheet P is passively rotated around the support shaft 11 and presses the prepreg sheet P on the outer surface of the mandrel 20 along the taper of the mandrel 20. In this state, when the air cylinder 6 is extended, the substrate 4 moves around the support shaft 2 as shown in FIG.
Is rotated in the arrow direction, along with this, the mandrel 20 revolves around the support shaft 2 to the arc A-A direction, the substrate 4
The prepreg sheet P is rotated on the upper side, and the prepreg sheet P is pressed and laminated on the outer peripheral surface of the mandrel 20 .

Here, the substrate 4 rotates about the support shaft 2 located near the intersection of the axis of the mandrel 20 and the upper surface of the base 1 with respect to the tapered surface of the mandrel 20. There is no gap or relative slip between the mandrel 20 and the prepreg sheet P on the outer periphery. On the other hand, the pressing plate 10
While abutting on the prepreg sheet P layer wound around the mandrel 20 and passively rotating around the support shaft 11, the support member 11 horizontally extends around a support shaft L extending upward at right angles to the support shaft 11 and the substrate 4. Since it is rotatable, the mandrel 20
Even if the support shaft 11 does not become perpendicular to the axis 20, in this case, the pressing force of the substrate 4 is larger at the large diameter portion of the mandrel 20 than at the small diameter portion. The substrate 4 is passively rotated around the support axis L to return to the old position so as to be pressed. Thereby, the attitude of the support shaft 11 is always controlled so as to be substantially perpendicular to the axis of the mandrel 20, so that the substrate 4 simply passively rotates around the support shaft 11 so as to follow the generatrix or the tapered surface of the mandrel 20. The prepreg sheet P is pressed toward the mandrel 20 along the substrate 4 along the entire axial length of the mandrel 20 from the large diameter portion to the small diameter portion without any gap (see FIG. 2).
No gap and no substantial relative slip occur between 20 and the push plate 10. Accordingly, the prepreg sheet P is laminated without looseness on the entire outer periphery of the mandrel 20, and no wrinkles or the like are generated, and thus, quality deterioration factors such as breakage of the reinforcing fibers in the prepreg sheet P can be eliminated .

When the taper angle is small, or when the number of stacked prepreg sheets P is small and the rolling angle of the mandrel is not so large, the support shaft 11 is not necessarily rotatably supported around the axis L. Need not be. Support shaft 11
The substrate 4 can be substantially made to follow the taper of the mandrel 20 only by supporting the substrate 4 rotatably around the substrate 4.

After winding and laminating the required number of prepreg sheets P around the mandrel 20, the vertical motion air cylinder 14 is operated to raise the push plate 10, and the prepreg sheet P is crimped onto the mandrel 20 which is laminated. After taping with a heat shrink tape or the like, the prepreg sheet P which has become a cylindrical body together with the mandrel 20 is taken out, and this is heated to 80 to 180 ° by a known heating device (not shown) via an intermediate temperature of 30 to 40 °. Heat with C. Then, the respective layers of the prepreg sheet P are heated and fused together in the intermediate temperature region to be integrally bonded, and then thermally cured in the high temperature region.
The cured tubular prepreg sheet P is separated from the mandrel 20 by a separating device (not shown) to obtain a tubular fiber-reinforced composite material.

When the molded article is used integrally with the mandrel 20, the mandrel is used as it is as a part of the product, otherwise, the cylindrical body of the prepreg sheet P is fixed by an appropriate holding device. While holding it,
Using a separator (not shown), only the tubular prepreg sheet P is separated from the mandrel 20 to obtain a tubular resin product from which the mandrel has been removed.

In the above description, the mandrel 20 can be made of various materials such as metal, wood, paper, concrete, resin and the like according to the purpose of use, but appropriate rigidity is required to maintain the shape. The vertical moving air cylinder 14 can control the pressing force of the pressing plate 10 against the substrate 4 according to the number of prepreg sheets P around the mandrel 20.

As described above, in this embodiment, the prepreg sheet P can be continuously pressed and laminated on the mandrel 20 without breaks in a short time. Push plate 10 is moved vertically by air cylinder 14
To move the mandrel 20 up and down.
Workability when molding the fiber reinforced composite material can be significantly improved. Further, in the above-described embodiment, a device for heating the substrate 4 or the pressing plate 10 is provided as necessary to reduce the viscosity of the prepreg sheet P wound around the mandrel 20,
Each layer of the prepreg sheet P to be laminated and the prepreg sheet P and the mandrel may be heated and fused.

Next, as shown in FIG. 6, an elongated rod-shaped mandrel 30 having a frusto-conical shape is provided with a gently tapered portion 31 having a taper of a relatively small angle and a small-diameter end portion of the gently tapered portion 31. Steep taper portion 32 with a relatively large angle taper
In the case where the prepreg sheet P has two or more tapered portions having a plurality of tapered portions, a prepreg sheet P is formed by using a device similar to the previous embodiment or a smaller device. It can be laminated by pressure bonding on the outer peripheral surface of the steep taper portion 32.

In particular, the prepreg sheet P is laminated on the entire mandrel 30 including the sharp taper portion 32 and the gentle taper portion 31,
In the case of forming a substantially single gentle taper, FIG.
First, as shown in FIG.
₁ after stacking, the tapered outer periphery of the plurality of stages of slow and fast entirely laminated with prepreg sheets P _2. in this case,
If the winding pressure of the large diameter portion is larger than that of the small diameter portion of the steep taper portion 32, and the lamination thickness of the small diameter portion is larger than that of the large diameter portion, the larger winding pressure is smaller than the smaller thickness. also because stacking thickness is thin, lamination thickness becomes large diameter portion, by further to increase the number of stacked prepreg sheets P ₁ about the small diameter portion side in the shape of a prepreg sheet P ₁ end at an acute angle, rapid The taper of the tapered portion 32 has a small angle, and the step with the small angle of the gentle taper becomes small or eliminated. Next, the outer peripheral surfaces of the tapered portions 31 and 32 are entirely covered with the prepreg sheet P _2.
Can be continuously laminated. As a result, the prepreg sheet P ₂ having a tapered outer peripheral surface that is more smoothly continuous as a whole without loosening of the sheet is generated.
Can be stacked.

In the present invention, it is needless to say that the tubular resin product can be formed using not only the prepreg sheet but also a thermosetting resin sheet which is not reinforced in general. The present applicant conducted an experiment using the apparatus for molding a tubular resin product according to the present invention, and obtained the following favorable results.

Experimental Example 1 The mandrel used had a tip diameter of 3.4 mm, an original diameter of 13 mm, and a length.
It is a 1500 mm metal rigid mandrel, and the prepreg sheet used is a carbon fiber unidirectional prepreg sheet made of petroleum pitch-based carbon fiber impregnated with epoxy resin (trade name: Granock prepreg E4025; manufactured by Nippon Oil Co., Ltd.) And a carbon fiber fabric prepreg sheet (manufactured by Nippon Oil Co., Ltd.) obtained by impregnating a petroleum pitch-based carbon fiber fabric with an epoxy resin.

First, a carbon fiber unidirectional prepreg sheet is wound eight layers around the mandrel at a fiber direction of ± 45 ° with respect to the axial direction of the mandrel, and then a carbon fiber unidirectional prepreg sheet is placed on the mandrel. After winding four layers around the mandrel with the direction parallel to the axial direction of the mandrel, and further winding two layers of prepreg sheet of carbon fiber woven thereon, taping the outermost layer with a polypro tape and a polyester tape, a thermosetting oven At 130 ° C. for 1 hour.

As a result, the inner diameter of the tip was 3.8 mm, and the thickness was 1.6 m.
m, a pipe made of carbon fiber composite material with a length of 1120 mm is obtained,
When this pipe was cut and its cross section was observed, no defects such as voids were found, and the quality of the carbon fiber composite pipe could be improved. Experimental Example 2 mandrels used were 7, tip diameter D ₁ is 2.
0 mm, the small diameter portion D ₂ of the gently tapered portion 31 is 5.3 m, Moto径D ₃ is 13
mm, axial length is 1200mm at gentle taper part 31, sharp taper part
It is a metal mandrel having a rigidity of 32 and 300 mm, and the prepreg sheet used is the same as that in Experimental Example 1.

First, as shown in FIG.
Elementary fiber unidirectional prepreg sheet P₁With the device shown in FIG.
The fiber direction with respect to the axial direction of the mandrel 30
At ± 0 °, the tip of the sharply tapered portion 32 of the mandrel
The winding force on the base part side of the larger diameter is stronger than that on the smaller diameter part side of
Layer wrapped. When winding around the sharp taper portion 32 is completed
In the point, the tip part of the steep taper part 32 is
Is thicker than the base side and the number of windings is larger.
Prepreg sheet P of steep taper part 32 ₁Outer surface
Has a small angle, and the step with the gentle taper portion 31 is almost
It has been eliminated.

Next, using the apparatus shown in FIG.
Carbon fiber unidirectional prepreg sheet P for entire barrel 30_TwoTo
Align the line at ± 45 ° with respect to the mandrel axis.
Eight layers were wound in the direction with equal pressure. Next, the carbon fiber
Wei-directional prepreg sheet P _TwoThe man direction of the fiber
Wrap four layers at ± 0 ° (parallel) to the axial direction of the drain
And carbon fiber prepreg sheet P_TwoTo
After winding two layers, poly tape and polyester tape
Tap the outer surface of the outermost layer with a heat
Cured by heating at ° C for 1 hour.

As a result, the inner diameter of the tip was 2.7 mm and the inner diameter of the base was 1 mm.
1.0mm, tip thickness 2.2m, base thickness 1.6mm, total length 1120mm
Of the carbon fiber composite material having a substantially uniform taper angle throughout. When this pipe was cut and its cross section was observed, no defects such as voids were recognized, and the quality of the carbon fiber reinforced composite material pipe could be improved.

[0041]

As described above, according to the present invention, the substrate is rotated in a plane of the substrate about a predetermined first axis, and the push plate is tangentially rotated with respect to the substrate rotation direction. Since it is passively and freely rotatably supported around the extending second axis, relative slip does not occur between the thermosetting resin sheet laminated on the mandrel, the substrate and the pressing plate.

[0042] In addition to the above, if the push plate is allowed to rotate further around the third axis, the second axis is always oriented at right angles to the axis of the rolling mandrel. The push plate can more precisely follow the tapered surface over the entire rolling region of the mandrel. Thereby, in the step of pressing and laminating the thermosetting resin sheet around the mandrel, between the thermosetting resin sheet and the substrate and the pressing plate, since there is no gap between them and no relative slip occurs, Floating, wrinkling or breakage hardly occurs on the thermosetting resin sheet, the strength of the product is prevented from lowering, and the quality is improved.

When the center of rotation of the substrate is the first axis passing near the intersection between the axis of the mandrel and the base, slipping is reduced in the rolling of the mandrel, and the above effect is further promoted. Therefore, if the distance between the base and the predetermined first support shaft can be freely adjusted, it becomes easy to find the first support shaft at the convergent vertex of the tapered surface of the mandrel as much as possible.

Even if a prepreg sheet is used as the thermosetting resin sheet, no stress is applied to the prepreg sheet in a required direction at the time of molding. Therefore, even if carbon fibers having a high elastic modulus are used, molding can be performed without difficulty. In addition, it is possible to obtain a lighter molded article having high strength and high elastic modulus. Therefore, since the strength increases as a cylindrical resin product,
The method and apparatus according to the present invention are suitable for elongate tubular resin products such as golf club shafts.

Further, since the mandrel can be freely attached to and detached from the apparatus according to the present invention, the work of attaching and detaching the mandrel becomes easy and the workability can be remarkably improved.
Further, even for a plurality of tapered mandrels having a plurality of gradually tapered surfaces, the thermosetting resin sheet can be laminated along each tapered surface, so that the thermosetting resin sheet in the sharply tapered portion Can be prevented from being raised, wrinkled or broken.

In this case, the laminating thickness of the thermosetting resin sheet is reduced by increasing the winding pressure of the thermosetting resin sheet wound and laminated on the sharply tapered portion toward the large diameter portion of the sharply tapered portion. Therefore, the outer periphery of the thermosetting resin sheet laminated on the steep taper portion approaches the taper angle of the gentle taper portion, and thereafter, the thermosetting resin sheet can be smoothly laminated on the entire outer periphery of the mandrel. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of an apparatus for molding a cylindrical resin product according to the present invention.

FIG. 2 is a front view of the cylindrical resin product molding apparatus of FIG. 1 in a state where a rod-shaped mandrel is sandwiched between a substrate and a pressing plate.

FIG. 3 is a front view showing a second embodiment of the present invention.

FIG. 4 is a perspective view of a bar-shaped mandrel without a taper.

FIG. 5 is a perspective view of a rod-shaped mandrel having a single tapered outer peripheral surface to which the present invention is applied.

FIG. 6 is a perspective view of a rod-shaped mandrel having a plurality of tapered outer peripheral surfaces to which the present invention is applied.

FIG. 7 is a longitudinal sectional view for explaining an embodiment of the present invention, in which a prepreg sheet is laminated on the mandrel shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Base 2 Support shaft (1st axis) 3 Connecting rod 4 Substrate 6 Air cylinder (1st actuator) 10 Push plate 11 Support shaft (2nd axis) 12 Bearing 14 Vertically moving air cylinder (2nd actuator)
(Third axis) 20 Mandrel 30 Mandrel (with multiple steps taper) 31 Slow taper 32 Sharp taper P, P ₁ , P ₂ Pre-preg sheet

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) B29C 70/06 B29C 53/56 B29D 23/00 B32B 1/08

Claims (14)

(57) [Claims] 1. A mandrel with a taper is sandwiched between a substrate and a pressing plate, a thermosetting resin sheet is supplied to a part of a peripheral surface of the mandrel, and the pressing plate is arranged along the tapered surface of the mandrel. While tilting the substrate, the mandrel is rolled around its axis by rotating the substrate in a plane including the substrate around a predetermined first axis, and the mandrel is moved to the outer peripheral surface of the mandrel. A method of manufacturing a tapered tubular resin product, comprising laminating a thermosetting resin sheet, taking out a mandrel on which the thermosetting resin sheet is laminated from between a substrate and a pressing plate, and performing heat treatment. 2. The method for manufacturing a tapered tubular resin product according to claim 1, wherein the predetermined first axis is near an intersection between the axis of the mandrel and the substrate. 3. The thermosetting resin sheet subjected to the heat treatment,
The method for producing a tapered tubular resin product according to claim 1 or 2, wherein the product is extracted from the mandrel. 4. The tapered surface of a mandrel by passively supporting the push plate freely around a second axis extending tangentially to the direction of rotation of the substrate. The method for producing a tapered tubular resin product according to any one of claims 1 to 3, wherein 5. The push plate is passively and freely rotatable around a second axis extending tangentially to the direction of rotation of the substrate, and is supported by the second axis and the substrate. The tapered member according to any one of claims 1 to 4, wherein the push plate is made to follow the tapered surface of the mandrel by passively and freely rotatable around a third axis that is substantially perpendicular. Manufacturing method of tubular resin products 6. The tapered cylinder according to claim 1, wherein the thermosetting resin sheet is a fiber-reinforced composite material sheet formed by impregnating fibers with a thermosetting resin. For manufacturing resin products 7. A tapered mandrel comprising: a gently tapered portion having a relatively small angle taper; and a sharply tapered portion having a relatively large angle taper continuous with the small diameter end of the gently tapered portion. 2. A thermosetting resin sheet having a plurality of steps of taper, and firstly laminating a thermosetting resin sheet on a steeply tapered portion, and then laminating the outer periphery of the gradually and steeply tapered portions entirely with a thermosetting resin sheet. A method for producing a tapered tubular resin product according to any one of claims 1 to 6. 8. When laminating a thermosetting resin sheet on a steeply tapered portion, the winding pressure of the large diameter portion is made larger than that of the small diameter portion, and the lamination thickness of the small diameter portion is made larger than that of the large diameter portion. A method for producing a tapered tubular resin product according to claim 7, 9. A substrate extending in a plane and rotatable about a predetermined first support shaft in the plane, and a substrate for rotating the substrate by a predetermined amount about the first support shaft. 1
And an actuator, which is disposed so as to face one surface of the substrate and is passively rotatably supported around a second support shaft extending in a tangential direction to a rotation direction of the substrate. A push plate; a second actuator that is reciprocally movable toward the substrate and presses the push plate; and extends substantially in a radial direction of the substrate and freely rolls between the substrate and the push plate. And a supply means for supplying a thermosetting resin sheet to the peripheral surface of the mandrel. The relative movement of the substrate and the push plate causes the periphery of the mandrel to move. Device for manufacturing tapered tubular resin product characterized by laminating thermosetting resin sheet on surface 10. The tapered cylindrical resin product according to claim 9, wherein the second support shaft is passively rotatable around an axis perpendicular to the mandrel and the substrate. manufacturing device 11. The production of a tapered tubular resin product according to claim 9, wherein the thermosetting resin sheet is a fiber-reinforced composite material sheet formed by impregnating fibers with a thermosetting resin. apparatus 12. The method according to claim 9, wherein the predetermined first support shaft is located near an intersection between the axis of the mandrel and the substrate.
An apparatus for manufacturing a tapered tubular resin product according to any one of items 11 to 11 13. The apparatus for manufacturing a tapered tubular resin product according to claim 9, wherein a relative distance between the predetermined first support shaft and the substrate is variable. 14. A tapered mandrel comprising: a gently tapered portion having a relatively small angle taper; and a sharply tapered portion having a relatively large angle taper connected to a small diameter end of the gently tapered portion. 14. The apparatus for producing a tapered tubular resin product according to claim 9, having a plurality of stages of taper.