JP2000102983A - Filament winding mandrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mandrel characterized by that a mandrel main body is not damaged when a molded object is cut on the mandrel after resin curing by a cutter when a cylindrical body made of FRP(fiber reinforced plastic) is to be molded by a filament winding method. SOLUTION: A mandrel 1 is formed in such a state that a drive shaft 3 pierces a mandrel main body 2 and stepped parts 4 are provided between both end parts of the mandrel main body 2 and the drive shaft 3. Key grooves 4a are formed in the stepped parts 4 and cutting rings 5 made of a resin and restricting rings 6 are fitted in the stepped parts 4 and fixed to the mandrel main body 2 in an integrally rotatable and detachable manner. The prescribing rings 6 are made of a metal and have pins 8 provided therein at a predetermined pitch along the peripheral direction. A molded object formed by a filament winding method is cut at the position opposed to the cutting rings 5 after resin curing by a cutter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filament winding mandrel, and more particularly, to a filament winding mandrel suitable for forming a cylindrical body by cutting off both ends of a filament wound molded product wound and laminated on a mandrel. It is about.

[0002]

2. Description of the Related Art As a method for efficiently forming a cylindrical pipe or container made of FRP (fiber reinforced plastic), there is a filament winding method. In the filament winding method, a product is manufactured by winding a resin-impregnated fiber around a mandrel and then curing the resin. The strength of the product formed by the filament winding method is greatly affected by the winding angle of the fiber. In the filament winding method,
When the winding angle of the fiber is larger than 45 °, the fiber can be wound at a predetermined pitch even if the fiber is wound around a cylindrical mandrel. However, when the winding angle is 45 ° or less, the tightening force of the fiber becomes small, and it becomes difficult to wind the fiber at a predetermined winding angle and at a predetermined pitch.

[0003] Therefore, when manufacturing a product having a small winding angle, a mandrel in which both ends of a cylinder are formed in a hemispherical shape, or a cylindrical mandrel having pins projecting from both ends is used. After the fiber is wound in a predetermined layer at a predetermined winding angle and the resin is thermoset, both ends of the molded body are cut and released from the mandrel to obtain a product. That is, when the winding angle is 45 ° or less, after cutting the molded body fitted to the mandrel after heat curing with a cutter,
The product needs to be removed from the mandrel.

Japanese Unexamined Patent Publication (Kokai) No. 3-190722 discloses a method of performing filament winding molding while hooking and folding a roving impregnated with resin into locking members provided at both ends of a mandrel. A method for removing a side edge is disclosed. FIG.
As shown in (a), a solid round bar-shaped mandrel body 51 is provided.
A cylindrical sub-mandrel 52 is fitted around the outer periphery of both ends (only one side is shown), and a pin ring 53 as a locking member is fitted around the outer periphery of the sub-mandrel 52. The sub-mandrel 52 and the pin ring 53 are fixed to the mandrel main body 51 by bolts 54. Stopper pins 55 used for folding the fibers are radially implanted in the pin ring 53 at a predetermined pitch. A peripheral groove 56 is formed on the outer periphery of the sub-mandrel 52 at a position immediately inside the pin ring 53.

After forming the molded body 57 by filament winding using the above-mentioned mandrel, a portion inside the pin ring 53 is fastened from the outer periphery by a fastening member 58 composed of two half-shaped rings. Hold it in the locked state. Next, the fastening member 58 and the pin ring 5
3, the molded body 57 is cut at a cutting site opposed to the circumferential groove 56, and after removing both cut end portions from the mandrel, the molded body 57 integrated with the mandrel is removed.
It is cured while being tightened by the tightening member 58.

Japanese Patent Application Laid-Open No. 50-33263 discloses FIG.
As shown in (b), at both ends of the cylindrical mandrel 59, a number of pins 60 determined by the helical winding angle (winding angle) are equally spaced at right angles to the axis of the mandrel 59 and in the circumferential direction. Auxiliary ring 6 distributed and attached to
1 is disclosed, and a method of forming a cylindrical body made of FRP by filament winding is disclosed. In this method, when the fiber (roving) 62 impregnated with resin is wound on the mandrel 59, the fiber 62 is attached to the auxiliary ring 61.
It is reversed through the upper pins 60 and wound sequentially. The auxiliary ring 61 is formed by winding a predetermined amount of the fiber 62 to form a cylindrical body. After the resin is cured, the mandrel 5 is integrally released from the mandrel 59 together with the molded body.
9 is fitted so as to be slidable in the axial direction along the peripheral surface of the base member 9.
Then, after releasing the molded body from the mandrel 59, the auxiliary ring 61 is cut and removed to obtain a cylindrical body having a predetermined size.

[0007]

When cutting a molded body on a mandrel after curing of the resin, it is necessary to use a cutter whose blade is rotated by power as a cutter, and the surface of the mandrel is easily damaged during the cutting operation. When filament winding is performed with the surface of the mandrel scratched,
When using a roving in which thin fibers are bundled as a wound fiber, there is a problem that the fibers are caught by a scratch and fluffed. In addition, there are also a problem that resin and fibers enter into the wound, making it difficult to remove the mold, and a problem of damaging the inner surface of the molded body.

In the method using a mandrel disclosed in Japanese Patent Application Laid-Open No. 50-33263, the molded body is cut after the resin is cured, but the molded body is cut together with the auxiliary ring 61 from the mandrel 59 in a cut state. Therefore, there is no possibility that the surface of the mandrel 59 is damaged when the molded body is cut. However, since the auxiliary ring 61 is fitted on the peripheral surface of the mandrel 59, the fibers 62 wound over the auxiliary ring 61 float up from the surface of the mandrel 59 near the auxiliary ring 61. As a result, there is a problem that it is necessary to largely cut and remove the end of the molded body in order to form an accurate cylindrical product.

Further, in the filament winding method disclosed in Japanese Patent Application Laid-Open No. 3-190722,
Since the cutting of 7 is performed before the resin is cured, and the cutting is performed at a position facing the circumferential groove 56 formed in the sub-mandrel 52, the mandrel is not damaged. However, there is a possibility that the fibers are caught in the circumferential groove 56 and become fluffed when the fibers are wound. Further, the resin enters the peripheral groove 56, and it is difficult to completely remove the resin. Further, it is difficult to uniformly tighten the end portion of the molded body 57 with the tightening member 58, the strength of the product tends to vary, and it is difficult to manufacture a cylinder having high required accuracy.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to form a cylindrical body made of FRP (fiber reinforced plastic) by a filament winding method, and to form the cylindrical body on a mandrel after curing the resin. An object of the present invention is to provide a filament winding mandrel that does not damage the mandrel body even when the body is cut with a cutter.

[0011]

In order to achieve the above object, according to the first aspect of the present invention, a cutting ring made of a material having a smaller hardness than the cutter is detachably fixed to both ends of the mandrel body. did.

According to a second aspect of the present invention, in the first aspect of the present invention, the mandrel main body has a restriction ring projecting from the cutting ring at a predetermined pitch along a circumferential direction. Is fixed to the mandrel main body so as to be rotatable integrally and detachably.

According to a third aspect of the present invention, in the second aspect of the invention, the cutting ring and the regulating ring are integrally formed of resin. According to a fourth aspect of the present invention, in the second aspect of the invention, the cutting ring is made of a resin, and the restricting ring is made of metal, and a pin is detachably projected as a restricting portion.

When a cylindrical body made of FRP (fiber reinforced plastic) is formed by a filament winding method using the mandrel of the first aspect of the invention, the resin is impregnated with the mandrel rotated at a predetermined speed. Fiber is supplied to the mandrel. The fibers are fed along the axial direction of the mandrel, are folded at both ends of the mandrel, and a predetermined amount of the fiber layer is wound around the mandrel to form a compact on the mandrel. The resin is cured before the molded body is released from the mandrel. After the resin is cured, the molded body is cut by the cutter at a position facing the cutting ring, and the product and the cut end are removed from the mandrel. Since the cutting ring is disposable, there is no problem even if it is damaged by the cutter.

According to a second aspect of the present invention, in the first aspect of the present invention, the fiber is wound around the drive shaft through a space between the regulating portions of the regulating ring fixed to the outside of the cutting ring. Wraps at Therefore, 4 fibers
When winding at a winding angle smaller than 5 ° or when narrowing the arrangement interval of the fibers, the fibers are smoothly wound around the mandrel.

According to the third aspect of the present invention, in the second aspect of the present invention, since the cutting ring and the restricting ring are integrally formed of resin, the number of steps for assembling the mandrel is reduced. Further, unlike the reusable restriction ring in which the restriction ring is formed separately from the cutting ring and the restriction pin is detachably protruded, there is no need to remove the restriction pin before curing the resin.

According to the fourth aspect of the present invention, in the second aspect of the present invention, since the restricting ring is made of metal and the pin is projected as a restricting portion, the cutting ring 5 and the restricting ring 6 are made of resin. The positional accuracy of the restricting portion is higher than in the case of integrally forming.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) Hereinafter, a first embodiment in which the present invention is embodied in a mandrel used when a shaft body of a propeller shaft of a vehicle is manufactured by a filament winding method will be described. This will be described with reference to FIGS. As shown in FIG. 1A, a mandrel 1 is formed in a state in which a mandrel body 2 formed of a metal cylinder is penetrated by a drive shaft 3, and a step is formed between both ends of the mandrel body 2 and the drive shaft 3. A part 4 is provided. Each step portion 4 is formed in a ring shape and has a key groove 4
a are respectively formed.

A cutting ring 5 and a regulating ring 6 are fixed to each step 4 so as to be rotatable integrally with the mandrel body 2 and detachably. The outer diameter of the cutting ring 5 and the regulating ring 6 is formed to be the same as the outer diameter of the mandrel main body 2, and the inner diameter is formed slightly larger than the outer diameter of the step portion 4. The cutting ring 5 is formed of a material having a hardness lower than that of a cutter for cutting the molded body after the resin of the molded body formed by the filament winding method is cured. In this embodiment, the cutting ring 5 is used.
Is made of resin and has a key groove 5a having the same width as the key groove 4a on its inner surface.
(Shown in FIG. 1B). As the resin, for example, a phenol resin is used. The cutting ring 5 is fitted into the step portion 4 with the key groove 5a facing the key groove 4a of the step portion 4, and the mandrel body is inserted via the key 7 fitted into both key grooves 4a, 5a. 2 and is fixed so as to be integrally rotatable and detachable.

As shown in FIG. 2 and FIG.
Is made of metal, and a key groove 6 a is formed at a predetermined position on the inner surface of the restriction ring 6. The restriction ring 6 is fitted to the step portion 4 with the key groove 6a facing the key groove 4a of the step portion 4, and the key 7 fitted to both key grooves 4a, 6a.
Is fixed to the outside of the cutting ring 5 so as to be rotatable integrally with the mandrel main body 2 and detachably.

The restricting ring 6 is provided with pins 8 as restricting portions projecting at a predetermined equal pitch along the circumferential direction. The pin 8 is made of metal and, as shown in FIG. 3, is removably fitted and fixed to a fitting hole 9 formed radially at an equal pitch in the ring portion 6b of the regulating ring 6. The diameter of the pin 8 varies depending on the strength of the fiber used and the tension at the time of winding.
In the case where the thread tension is large, about 5 to 3 mm, or in order to erect a large number of pins 8, about 1 to 2 mm is desirable.

A plurality of types of restriction rings 6 having different arrangement pitches of the pins 8 are prepared, and a restriction ring 6 suitable for winding conditions is selected and fixed to the mandrel 1. The arrangement pitch of the pins 8 is
The number of pins is the same, and does not differ greatly like the pitch which can be adjusted by changing the number of pins 8, but the number of pins is 1 to
Those that change within a range of about 30% are prepared in advance.

In the case of manufacturing a product with high required accuracy with respect to strength and shape, the upper limit of the diameter of the drive shaft 3 is regulated by the outer diameter of the mandrel main body 2 and the cross-sectional area of the cylindrical portion of the molded body. . Specifically, the cross-sectional area of the cylindrical portion of the compact is S
1 and a circle having a diameter equal to the outer diameter of the mandrel body 2;
Assuming that the difference between the areas of circles having the same diameter as the outer diameter of the drive shaft 3 is S2, it is necessary to satisfy S2> S1, and S2 ≧ 2S
It is desirable that 1 holds.

Next, the mandrel 1 constructed as described above
A method of manufacturing a shaft main body of a propeller shaft by a filament winding method using the method will be described. The filament winding machine includes a rotating shaft (not shown) driven while supporting the mandrel 1, and a yarn guide (nozzle) 10 reciprocated along the mandrel 1. By adjusting the rotation speed of the rotating shaft and the moving speed of the yarn guide 10, the angle at which the fiber F (carbon fiber in this embodiment) fed from the yarn guide 10 forms with the axial direction of the mandrel 1 is arbitrary. Set the angle,
It can be wound on the mandrel 1. The mandrel 1 is set on a rotary shaft of a filament winding machine (not shown) with both drive shafts 3 supported.

With the mandrel 1 set, the filament winding machine is operated, the rotation of the mandrel 1 and the movement of the yarn guide 10 are controlled, and the fiber F to which the thermosetting resin (epoxy resin) is adhered becomes the mandrel 1. Wound on top. After the fiber F passes between the pins 8,
The mandrel 1 is wound around the drive shaft 3 so as to be folded back, and is wound between the pins 8 so that an angle (winding angle) formed between the pins 8 and the axial direction of the mandrel 1 becomes a predetermined angle. A fibrous layer is formed. The winding angle is required when used in a vehicle
It is set to a predetermined value that satisfies characteristics such as torsion and vibration. In this embodiment, the winding angle is set to approximately ± 10 °.

After the fibers F are wound until the number of the fiber layers wound on the mandrel 1 reaches a predetermined number, the fiber F is wound around a portion corresponding to the yoke insertion portion at a winding angle of 90 °. The fiber F is wound until a fiber layer having a thickness of is formed. That is, a formed body having hoop winding formed near both ends of the fiber layer wound at a relatively small winding angle is formed.

After finishing the winding of the fiber F, the mandrel body 2
A plastic tape is spirally wound around the outer peripheral surface of the molded body corresponding to the above. Tape width 5
Those having a size of about 0 mm are used. It is preferable to use a heat-shrinkable film such as a polyester film as the plastic tape.

Next, the mandrel 1 is removed from the filament winding machine, and the pin 8 is further connected to the regulating ring 6.
, And the mandrel 1 is put into a heating furnace together with the molded body, and the resin is cured at a predetermined temperature. The curing temperature varies depending on the resin.
It is about 0 ° C. A cylindrical body made of FRP is formed on the mandrel 1 by heat curing. After cooling, both ends of the FRP cylindrical body are cut by the cutter at positions facing the cutting ring 5. Then, from the mandrel 1 to the restriction ring 6, the cutting ring 5, and the FR
The P-shaped cylinder is removed to form a propeller shaft shaft body having a predetermined length.

Thereafter, an adhesive is applied to the inner peripheral surface of the yoke insertion portion of the shaft main body and the outer peripheral surface of the base end of the metal yoke, and the yoke is inserted into the yoke insertion portion. Then, the adhesive is heated and hardened, whereby the yoke is firmly fixed to the shaft main body, and the propeller shaft is completed.

A part of the hardened cylinder is fitted to the cutting ring 5 and the regulating ring 6 removed from the mandrel 1. However, since the pin 8 is removed before the hardening, both are simple. Can be removed from the cured resin. The cutting ring 5 is disposable because the surface is damaged by the cutter when the molded body is cut. The restriction ring 6 is reused after the pin 8 is fitted in the fitting hole 9.

This embodiment has the following effects. (1) Cutting rings 5 formed of a material having a lower hardness than the cutter are detachably fixed to both ends of the mandrel main body 2. Therefore, when cutting both ends of the molded body formed by the filament winding method with a cutter after curing the resin, the molded body can be cut without damaging the mandrel by cutting at a position facing the cutting ring 5. Cutting ring 5
Since it is not reused, there is no problem even if it is damaged by the cutter.

(2) Since the cutting ring 5 is made of resin, it can be easily manufactured at a lower cost than metal. (3) A restricting ring 6 having restricting portions (pins 8) protruding from the mandrel main body 2 at a predetermined pitch along the circumferential direction is fixed to the outside of the cutting ring 5 so as to be integrally rotatable with the mandrel main body 2 and detachably. Have been. Therefore, by setting the pitch of the regulating portion to a value that matches the required performance, even when the fiber is wound at a winding angle smaller than 45 ° and the arrangement interval of the fiber is narrow, the fiber is smoothly wound around the mandrel. .

(4) The cutting ring 5 is made of resin, and the restricting ring 6 is made of metal. Therefore, compared to the case where the cutting ring 5 and the restricting ring 6 are integrally formed of resin, the positional accuracy of the restricting portion is higher.

(5) The regulating ring 6 is the mandrel body 2
Is fixed to the stepped portion 4 provided between both ends of the drive shaft 3 and the drive shaft 3, so that a fitting hole 9 for fitting and fixing a pin 8 as a restricting portion projected at a predetermined pitch in the circumferential direction. Can be formed at a small pitch. Therefore, at the time of filament winding, the fibers F constituting the cylindrical body made of FRP can be accurately arranged with a small winding angle, and the fibers F are densely arranged near the pins 8 (regulation portions) for regulating the arrangement of the fibers F. Can be suppressed.

(6) The pin 8 is detachably fitted into the fitting hole 9 as a restricting portion of the restricting ring 6, and after the fiber F is completely wound, the pin 8 is removed and the resin is thermoset. Therefore, the cured resin can be easily removed from the regulating ring 6 separated from the molded body after the thermosetting, and the regulating ring 6 can be reused.

(7) Instead of the fiber F being directly wound around the pin 8 (restriction portion) and folded, the fiber F
Since it is wound around and folded back, the force applied to the pin 8 is reduced, and the pin can be made thinner. Therefore, the arrangement pitch of the pins 8 can be made smaller. Further, the fiber F is prevented from being concentrated near the pin 8 and hindering the winding.

(8) The diameter of the drive shaft 3 is set so that the fiber F that is wound around the drive shaft 3 and turned back during filament winding does not rise from the surface of the fiber layer wound around the mandrel body 2. Have been. Therefore, even if the fiber F is repeatedly wound around the drive shaft 3, the fiber is smoothly wound around the mandrel 1.

(Second Embodiment) Next, a second embodiment will be described with reference to FIG. This embodiment is different from the above-described embodiment in that the cutting ring and the restriction ring are integrally formed of resin, and the other configurations are the same. The same parts as those of the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The cutting ring 11 has a ring width wider than that of the above-described embodiment, fins 12 as regulating portions projecting from the outer peripheral surface at an equal pitch, and a key groove 11a is formed on the inner surface. . Each fin 12 is formed so as to have a flat and substantially hexagonal cross section, and protrudes so as to extend in parallel with the axial direction of the cutting ring 11. A pin may be integrally protruded in place of the fin 12 as the restricting portion, but the fin 1 may be formed from the viewpoint of ease of molding and strength.
The structure in which 2 is protruded is preferable. The fins 12 protrude such that a space where the cutter can contact the surface of the cutting ring 11 without interfering with the fins 12 is present near the outer peripheral surface of the mandrel main body 2 when cutting the formed body formed by the filament winding method. Has been established.

When the cutting ring 11 is used, the cutting ring 11 is fixed to the step 4 by fitting the key 7 into the key grooves 4a, 11a. After passing between the fins 12, the fiber F is arranged so as to be wound around the drive shaft 3 and turned back, and the angle (winding angle) between the fins 12 and the axial direction of the mandrel 1 is a predetermined angle. As a result, a fiber layer having a predetermined thickness is formed on the mandrel 1. Then, after the hoop winding or the tape is wound in the same manner as in the above-described embodiment, the resin is cured, and at a position where the molded body after curing faces the cutting ring 11,
And it is cut by the cutter at a position avoiding the fins 12. After cutting, the cutting ring 11 is discarded together with the resin.

Therefore, in this embodiment, (1) to (3), (5), (7) and (8) of the first embodiment are used.
In addition to the same effects as described above, the following effects can be obtained.
(9) Since the cutting ring and the restricting ring are integrally formed of resin, the number of steps for assembling the mandrel 1 is reduced.

(10) The restricting ring 6 is formed separately from the cutting ring 5, and unlike the case where the restricting ring 6 is reused, the restricting pin 8 as a restricting portion before the resin is cured.
You don't have to remove it. Further, it is not necessary to remove the cured resin cut and removed from the molded body after curing from the regulating portion.

The embodiment is not limited to the above, and may be embodied as follows, for example. The present invention may be applied to a case where an FRP cylinder having a winding angle of less than 45 ° is produced by filament winding using a mandrel having no regulating portion.
For example, as shown in FIG. 6, the mandrel is formed into a shape having hemispherical portions 13 at both ends of a cylindrical mandrel main body 2, and a cutting ring 5 is fitted and fixed to a step 4 provided at both ends of the mandrel main body 2. . The hemispherical portion 13 is fixed to the drive shaft 3 via a key fitted into a key groove (not shown) so as to be integrally rotatable. In the mandrel 1 having this configuration, the fiber can be wound in a state where the winding angle is smaller than 45 ° even if there is no regulating part by folding back at the hemispherical portion 13. In this mandrel 1, the hemispherical portion 13 is used repeatedly. In this case, the thickness of the cutting ring 5 is such that when the molded body is cut,
Any size may be used as long as it does not reach the step by cutting a part of the ring, and it is not necessary to match the thickness of the restriction ring 6 as in the first embodiment, and the thickness can be reduced. Therefore, the amount of the disposable resin used is reduced.

When a regulating portion for regulating the arrangement of fibers is provided, a regulating pin is detachably attached to the mandrel main body 2 instead of providing the mandrel and the regulating ring 6 or the cutting ring 11 having the regulating portion. . For example, as shown in FIG. 7, a step portion 4 having a small outer diameter by the thickness of the cutting ring 5 is provided at both ends (only one side is shown) of the mandrel main body 2, and a regulating pin 14 is provided at the step portion 4.
Is detachably attached. Then, the cutting ring 5 is fitted and fixed to the step portion 4 inside the regulating pin 14. In this case as well, the fibers F pass between the regulating pins 14 and then are wound around the drive shaft 3 so as to be folded and wound around the mandrel 1 as in the first embodiment. Also in this case, the cutting ring 5 can be made thin.

In a configuration in which the regulating pin 14 is detachably attached to the mandrel main body 2, as shown in FIG.
A peripheral groove 16 for fitting the cutting ring 5 is formed in the mandrel main body 2 without providing a step at a position where the hole 15 for fitting the restriction pin 14 is formed. Then, in order to allow the cutting ring 5 to be greatly expanded, a cut 17 is formed. In this case, the cutting ring 5 is fitted in a position corresponding to the circumferential groove 16 through the region where the hole 15 is formed in an expanded state.

In order to fix the mandrel 1 while positioning it on the filament winding machine, the driving shaft 3
May be provided with a plane portion parallel to the axis. Although the number of plane portions is not limited, for example, three are provided at equal intervals in the circumferential direction.
In this case, it is easy to position the mandrel 1 at a predetermined position at the start of winding with the mandrel 1 fixed to the filament winding machine.

Since the cutting ring 5 is a member necessary for pulling out (removing) the mandrel 1, it may be attached to only one side of the mandrel 1. Since the cutting ring 5 is intended for removal from the mold, it is desirable that the outer diameter of the mandrel 1 be the same or slightly larger. If the outer diameter of the mandrel 1 is smaller than the outer diameter of the mandrel, the cut is smaller than the diameter of the mandrel when the molded body is cut, making it difficult to remove the mold.

The cutting ring 5 does not necessarily need to be rotatable integrally with the mandrel 1 and need not be positively fixed so as to be integrally rotatable. The outer diameter of the restriction ring 6 is not the same as the outer diameter of the mandrel body 2 and may be slightly smaller than the outer diameter of the mandrel body 2. This is because, unlike the case where the outer diameter of the restriction ring 6 is larger than the outer diameter of the mandrel main body 2, when the outer diameter of the mandrel main body 2 is smaller, the fiber F wound around the mandrel main body 2 closes to the restriction ring 6 and the mandrel main body 2 It will not be raised from 2.

The absolute value of the winding angle of the fiber F wound around the mandrel 1 before the hoop winding need not be the same in all the layers, but the winding angle may be changed for each layer. The hoop winding may not be necessary.

The matrix resin is not limited to the epoxy resin, but may be another thermosetting resin (eg, a polyimide resin) or a thermoplastic resin having a high flexural modulus (eg, polyetheretherketone). But,
When forming a propeller shaft, an epoxy resin is preferred from the viewpoint of cost and required performance.

The present invention may be applied to the manufacture of a cylindrical body for a drive shaft other than the propeller shaft of a vehicle. When the use rotation speed is low, or when the required performance such as torsional strength, heat resistance, and moisture resistance is lower than the propeller shaft of the vehicle, glass fibers or aramid fibers are mixed with carbon fibers as reinforcing fibers, Glass fibers or aramid fibers may be used alone. Further, as a combination of a fiber and a matrix resin constituting the FRP, a combination of a carbon fiber and a vinyl ester resin, a combination of a carbon fiber and a phenol resin, or the like may be employed. In this case, the cost of the resin can be reduced because the resin is cheaper than the epoxy resin.

The present invention is not limited to the drive shaft but may be applied to the manufacture of an arbitrary FRP cylindrical body. Examples of the reinforcing fibers include carbon fibers, glass fibers, and aramid fibers. The matrix includes a thermosetting resin such as an epoxy resin, a vinyl ester resin, an unsaturated polyester resin, and a phenol resin. Then, they are used in combination as appropriate to meet the required characteristics. Among the reinforcing fibers, carbon fibers are most preferable in terms of strength and weight reduction, and glass fibers are next preferable. As the matrix, an epoxy resin is most preferable in terms of heat resistance and moisture resistance.

In the case of a molded product having a low requirement for fiber alignment accuracy and product strength, a method is employed in which the fiber is wound around the regulating portion of the regulating ring 6 or the cutting ring 11 so as to be folded back. You may.

The inventions (technical ideas) other than those described in the claims which can be grasped from the above embodiments will be described below together with their effects. (1) In the invention described in claim 1, the cutting ring is made of a synthetic resin. In this case, it can be easily manufactured at low cost as compared with the case where it is formed of another material such as metal.

(2) In the first aspect of the present invention,
At both ends of the mandrel main body, fitting holes are formed at predetermined pitches to detachably fit pins that regulate the arrangement of the fibers outside of the fixing portion of the cutting ring. In this case, it can be manufactured with a simple modification of an existing mandrel with detachable pins.

[0056]

As described above in detail, according to the first to fourth aspects of the present invention, when a FRP cylindrical body is formed by a filament winding method, the molded body is formed on a mandrel after the resin is cured. Can be prevented from damaging the mandrel main body even if it is cut with a cutter.

According to the second aspect of the present invention, by setting the pitch of the regulating portion to a value corresponding to the required performance,
Even when the fibers are wound with a winding angle smaller than 45 ° and a narrow arrangement interval of the fibers, the fibers can be smoothly wound around the mandrel.

According to the third aspect of the present invention, since the cutting ring and the regulating ring are integrally formed of resin, the number of steps for assembling the mandrel is reduced. In addition, since the cutting ring is not reused, it is not necessary to remove the cured resin cut and removed from the molded body after curing from the regulating part, and the time required for release is less than when the regulating ring is reused. Become.

According to the fourth aspect of the present invention, the positional accuracy of the restricting portion is higher than when the cutting ring and the restricting ring are integrally formed of resin.

[Brief description of the drawings]

FIG. 1A is a partially exploded front view of a mandrel according to a first embodiment, and FIG. 1B is a perspective view of a cutting ring.

FIG. 2 is a front view of a regulating ring.

FIG. 3 is a sectional view showing a state in which a pin is being driven into a regulating ring.

FIG. 4 is a schematic perspective view illustrating the winding action of the fiber.

FIG. 5 is a perspective view of a cutting ring according to a second embodiment.

FIG. 6 is a front view of a mandrel according to another embodiment.

FIG. 7 is a partial front view of a mandrel according to another embodiment.

FIG. 8 is a partial front view of a mandrel according to another embodiment.

9A is a cross-sectional view showing a mandrel of the related art, and FIG. 9B is a schematic perspective view showing another mandrel of the related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Mandrel, 2 ... Mandrel main body, 5, 11 ... Cutting ring, 6 ... Restriction ring, 8 ... Pin as restriction part, 9 ... Fitting hole, 12 ... Fin as restriction part, F
…fiber.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasumi Miyashita 2-1-1, Toyota-cho, Kariya-shi, Aichi Pref. Inside Toyota Industries Corporation (72) Inventor Minoru Toeda 2-1-1, Toyota-cho, Kariya-shi, Aichi Pref. F term in Toyota Industries Corporation (reference) 4F205 AA36 AD16 AG08 AH17 AJ03 HA02 HA23 HA33 HA37 HA46 HB01 HC02 HC17 HF05 HF23 HK04 HK05 HK31 HK37 HL03 HL07 HL14 HW21

Claims (4)

[Claims] 1. A filament winding mandrel having a cutting ring formed of a material having a hardness lower than that of a cutter and being detachably fixed to both ends of a mandrel body. 2. A mandrel main body, wherein a restricting ring having restricting portions projecting at a predetermined pitch along a circumferential direction is fixed to the outside of the cutting ring so as to be integrally rotatable with the mandrel main body and detachably. Item 2. The mandrel for filament winding according to Item 1. 3. The filament winding mandrel according to claim 2, wherein the cutting ring and the regulating ring are formed integrally from a resin. 4. The cutting ring is made of resin,
3. The filament winding mandrel according to claim 2, wherein the restriction ring is made of metal, and a pin is detachably protruded as a restriction portion.