JP4653335B2 - Mandrel for filament winding - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a filament winding mandrel for a filament winding apparatus. More specifically, as a core material for winding a roving in which a reinforcing fiber such as carbon fiber or glass fiber is impregnated with a resin in order to form a cylindrical product in a filament winding apparatus used for manufacturing a cylindrical product made of fiber reinforced plastic. The present invention relates to a filament winding mandrel used.
[0002]
[Prior art]
Conventionally, as a mandrel for filament winding used in the manufacture of cylindrical pipes and containers made of fiber reinforced plastic, a step portion is provided between both ends of the mandrel body and the drive shaft, and the outer diameter of the mandrel body is provided at the step portion. Is known in which a regulating ring (guide ring) having a regulating portion (guide) protruding at a predetermined pitch along the circumferential direction is fixed to the mandrel main body so as to be integrally rotatable and detachable. (Japanese Unexamined Patent Publication No. 2000-102984). Further, in this publication, in order to fix the guide ring to the mandrel main body so as to be integrally rotatable and detachable, a guide ring having a key groove formed on the inner peripheral portion is formed with a key groove similar to the key groove. It is disclosed that after fitting the key groove into the stepped portion, the key is inserted into the key groove and fixed.
[0003]
[Problems to be solved by the invention]
However, the fixing with the key groove and the key has a problem in that the workability of attaching the guide ring is poor because the key cannot be inserted unless the key groove of the guide ring is aligned with the key groove of the stepped portion.
[0004]
By the way, the winding of the roving by the filament winding mandrel provided with the guide ring is performed on the drive shaft exposed to the outside of the guide ring through the mandrel main body between the guide ring guides at one end. After wrapping about 1/2 to 1 turn around the end, it is folded back and guided again between the guides on the same side to the guides on the other end, and likewise on the end of the drive shaft on the other end. This is done while repeating the roving.
[0005]
After the winding, usually, the wound roving is cut in the vicinity of the end of the mandrel body to remove the guide ring, but the roving is placed on the end of the drive shaft located in the guide ring pulling direction. Since the cut end portion is wound, the guide ring cannot be removed unless the cut end portion is removed, and there is a problem that the removal workability is poor.
[0006]
The guide ring is attached and detached manually, but it is desired to automate this in order to improve productivity.
[0007]
However, as described above, the conventional mandrel for filament winding has insufficient workability for attaching and removing the guide ring, which is an obstacle to automate this.
[0008]
The present invention has been made in view of the above-described conventional problems, and provides a filament winding mandrel excellent in guide ring attachment workability, and a filament winding mandrel excellent in guide ring removal workability. It is another object of the present invention to provide a mandrel for filament winding which is excellent in both workability for attaching and removing guide rings.
[0009]
[Means for Solving the Problems]
That is, according to the first aspect of the present invention, in the mandrel for filament winding in which guide rings with guides protruding are detachably attached to both ends of the mandrel body, the guide ring is attached to at least one of the mandrel body and the guide ring. The present invention provides a mandrel for filament winding, which is attracted to a mandrel body by a magnet provided.
[0010]
In the first aspect of the present invention, the guide ring is divided into a plurality of divided pieces in the circumferential direction, the divided pieces are integrated in a separable manner, and the divided pieces are arranged in the central axis direction of the guide ring. It is integrated as a preferable aspect that it is integrated by the fitting of the convex part and concave part which can only be slid, and the division | segmentation piece is integrated by the magnet.
[0011]
Further, the second of the present invention is a filament winding mandrel in which a guide ring with a guide protruding is detachably attached to both ends of the mandrel main body, the guide ring has a guide ring main body with a guide protruding, A cylindrical portion that is smaller than the outer diameter of the guide ring main body and extends coaxially outward from the outer end side of the guide ring main body, and the guide ring main body is at least one of the mandrel main body and the guide ring main body The present invention provides a mandrel for filament winding that is attracted to a mandrel body by a magnet provided on one side.
[0013]
Further, according to a third aspect of the present invention, in the mandrel for filament winding in which a guide ring with a guide protruding is detachably attached to both ends of the mandrel body, the guide ring has a guide ring main body with the guide protruding, An inner ring that can be pulled out only on the inner end of the guide ring body on the inner peripheral side of the guide ring body, and smaller than the outer diameter of the guide ring body and coaxially outward from the outer end side of the inner ring. A filament winding mandrel, wherein the guide ring body is attracted to the mandrel body by a magnet provided on at least one of the mandrel body and the guide ring body. It is to provide.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be further described with reference to the drawings.
[0016]
FIG. 1 is a sectional view showing a first example of a filament winding mandrel according to the present invention.
[0017]
In the figure, reference numeral 1 denotes a cylindrical mandrel body that is rotated via a drive shaft 2 protruding outward from both ends when winding a roving (not shown). The mandrel body 1 is cylindrical in this example, but may be a rectangular tube.
[0018]
Guide rings 3 are attached to both ends of the mandrel body 1. The guide ring 2 in this example is a doughnut-shaped member whose outer diameter is equal to or slightly smaller than the outer diameter of the mandrel body 1, and the drive shaft 2 is inserted into the inner peripheral portion, and is addressed to both ends of the mandrel body 1. It has been broken.
[0019]
A guide 4 projects from the outer periphery of the guide ring 3. The guide 4 regulates the winding position of the roving around the mandrel main body 1, and protrudes at a predetermined pitch so that the roving is passed between the guides 4.
[0020]
The guide 4 in this example is configured by a round bar-shaped pin having a sharp tip, but may be configured by a plate-shaped fin. In addition, the guides 4 in this example are formed in one row, but two or more rows can be provided by shifting the position in a zigzag manner.
[0021]
In particular, a magnet 5 is embedded in the end face on the inner end side (mandrel body 1 side) of the guide ring 3 of this example, and the guide ring 3 is attracted to the mandrel body 1 by the magnetic force of the magnet 5. The mandrel body 1 is rotated together.
[0022]
Usually, since the mandrel body 1 is made of steel, the guide ring 3 can be rotated together with the mandrel body 1 by providing the magnet 5 on the guide ring 3 and adsorbing it with this magnetic force as described above. Can be attached. Particularly, the attachment state of the guide ring 3 is unstable only in the initial stage of winding of the roving. After the roving is wound several times, the attachment state is stabilized by being pressed by the tension and the winding force of the wound roving. . Since the initial winding stage is usually a relatively gradual operation time before entering the steady operation, it is difficult for a large force to be applied to the guide ring 3, and the guide ring can be used without using a magnet having a very strong magnetic force. 3 can be rotated together with the mandrel body 1 without idling.
[0023]
On the other hand, when the attachment is performed by the attractive force of the magnet 5 as described above, the drive shaft 2 can be inserted into the inner peripheral portion of the guide ring 3 as long as at least the end surface of the mandrel body 1 is made of a magnetic material. In this case, the guide ring 3 can be securely attached without positioning in the circumferential direction. Accordingly, the mounting workability is good, and the mounting work can be easily automated by a machine. Further, as described above, since the magnet 5 does not have to be so strong, it can be prevented that the magnet 5 is difficult to be detached from the mandrel body 1.
[0024]
By the way, when at least the end surface of the mandrel body 1 is made of a non-magnetic material such as aluminum, contrary to the illustrated example, the magnet 5 is embedded in the end surface of the mandrel body 1 and the guide ring 3 is made of steel. In the same manner, the guide ring 3 can be attached. If at least the end surface of the mandrel body 1 and the guide ring 3 are both non-magnetic, the magnet 5 may be embedded in an annular shape so that different magnetic poles face each other on the opposing surfaces. Furthermore, when at least the end face of the mandrel body 1 and the guide ring 3 are both made of a magnetic material, the magnet 5 is not embedded in the guide ring 3 as in this example, but the magnet 5 is placed on the end face of the mandrel body 1. The magnet 5 may be embedded in both the guide ring 3 and the mandrel body 1.
[0025]
2 (a) and 2 (b) are front views of outer end side end surfaces showing other examples of the guide ring 3 shown in FIG. 1, and each guide ring 3 has two divided pieces 6a in the circumferential direction. , 6b, and the divided pieces 6a, 6b are integrated so as to be separable.
[0026]
In the guide ring 3 shown in FIG. 2A, the divided pieces 6 a and 6 b are integrated by fitting a convex portion 7 and a concave portion 8 that can slide only in the axial direction of the guide ring 3. The convex portion 7 and the concave portion 8 are formed so as to face the dividing surface. The convex portion 7 has an inverted trapezoidal cross-sectional shape perpendicular to the central axis of the guide ring 3, and the dividing surface is vertically cut in the central axis direction of the guide ring 3. The cross-sectional shape corresponding to the cross-sectional shape of FIG. Further, the guide ring 3 shown in FIG. 2B is obtained by integrating the divided pieces 6a and 6b by adsorption by the magnetic force of the magnet 9 embedded in the divided surface.
[0027]
As described above, when the guide ring 3 is constituted by the split pieces 6a and 6b that are detachably integrated, the guide ring 3 is attached to the guide ring 3 without sliding along the drive shaft 2 shown in FIG. It can also be removed by splitting. Further, when the guide ring 3 is removed after the roving is wound, the cutting end of the roving is covered on the guide ring 3 as described in the section “Problems to be solved by the invention”. , 6b and removing one by one makes it easier to remove the cutting end of the roving.
[0028]
2B, when the divided pieces 6a and 6b are connected by the magnet 9, the magnet 8 is also used as the magnet 5 for attracting the mandrel body 1 described in FIG. You can also.
[0029]
FIG. 3 is a sectional view showing a second example of the filament winding mandrel according to the present invention.
[0030]
The guide ring 3 in this example includes a guide ring main body 10 having a guide 4 projecting on the outer periphery, an outer diameter of the guide ring main body 10 that is smaller than the outer diameter of the guide ring main body 10 (the side opposite to the mandrel main body 1). ) And the cylindrical portion 11 extending outward from the same axis.
[0031]
The guide ring body 10 is the same as the guide ring 3 described with reference to FIG. 1, and a magnet 5 is embedded in the end face on the inner end side. The magnet 5 is the same as the magnet 5 described in FIG. 1, and the guide ring 3 in this example is also attracted to the mandrel body 1 by the magnetic force of the magnet 5.
[0032]
The cylindrical portion 11 in this example is a cylindrical member that is integral with the guide ring body 10 and covers a part of the drive shaft 2.
[0033]
When the guide ring 3 having the cylindrical portion 11 is used as in this example, the roving can be folded around the cylindrical portion 11 instead of the drive shaft 2 when the roving is wound around the mandrel body 1. When the roving is wound while being wound around the tube portion 11 and turned back, the removed roving is cut in the vicinity of the end of the mandrel body 1 when the guide ring 3 is removed, and the guide ring 3 is moved along the drive shaft 2. When retracted, the guide ring 3 can be removed together with the cutting end of the roving. Therefore, it is not necessary to remove the cutting end portion of the roving prior to removing the guide ring 3, and the workability of removing the guide ring 3 is improved. Further, as described above, since the guide ring 3 can be removed by simply pulling out the guide ring 3 after cutting, it is easy to automate the removal operation of the guide ring 3 by a machine.
[0034]
Since the guide ring 3 in this example is attached by the attractive force of the magnet 5 in the same manner as described in FIG. 1, the attachment workability is good as in FIG. Therefore, this example is excellent in both the attaching workability and the removing workability of the guide ring 3. Further, the arrangement of the magnets 5 in this example is the same as the description of FIG.
[0035]
By the way, when focusing attention only on the removal workability of the guide ring 3, the guide ring 3 of this example can be attached with the key 12 and the key groove 13 as shown in FIG. 4.
[0036]
In the example of FIG. 4, a key 12 is provided along the central axis direction of the drive shaft 2, and a key groove 13 that fits the key 12 is formed on the inner peripheral surface of the guide ring main body 10. 10 central axes are provided. The key groove 13 is opened in the end face on the inner end side of the guide ring main body 1 and can be fitted to the key 12 from this opening. By fitting the key 12 and the key groove 13, the guide ring 3 rotates together with the mandrel body 1 without idling.
[0037]
The key groove 13 in FIG. 4 is provided only on the inner peripheral surface of the guide ring main body 10, but is formed by adjusting the thickness of the cylindrical portion 11 so that the cylindrical portion 11 is also vertically cut in the central axis direction. You can also In this case, the key 12 may be formed longer.
[0038]
In this way, the mounting workability is inferior to that of the example of FIG. 3, but the idling prevention structure of the guide ring 3 can be obtained at a relatively low cost. Further, the key 12 and the key groove 13 can be used in combination with the magnet 5 shown in FIG.
[0039]
When the guide ring 3 is attached using the key 12 and the key groove 13 as described above, as shown in FIG. 5, a large number of key grooves 13 of the guide ring body 10 are provided in a spline shape, as shown in FIG. It is preferable that alignment with the key 12 on the drive shaft 2 side can be easily performed. Further, instead of the key 12 and the key groove 13 as shown in FIG. 4, a pin (not shown) is erected on one of the end surface of the mandrel body 1 and the end surface on the inner end side of the guide ring body 10, It is possible to prevent the guide ring 3 from slipping by providing a hole (not shown) into which the pin fits and fitting the two together.
[0040]
FIG. 6 is a sectional view showing a third example of a filament winding mandrel according to the present invention.
[0041]
The guide ring 3 in this example includes a guide ring main body 10 on which a guide 4 is protruded, and an inner ring 14 fitted on the inner peripheral side of the guide ring main body 10 so as to be able to be extracted only on the inner end side of the guide ring main body 10. And a cylindrical portion 11 that is smaller than the outer diameter of the guide ring body 10 and that extends coaxially from the outer end side of the inner ring 14 outward. Moreover, the same magnet 5 as what was demonstrated in FIG.1 and FIG.3 is provided in the end surface of the inner end side of the guide ring main body 10. FIG. The inner ring 14 is pressed against the mandrel body 1 and held by the guide ring body 10 being attracted to the mandrel body 1 by the magnetic force of the magnet 5.
[0042]
The inner peripheral surface of the guide ring body 10 is a tapered surface that expands in the direction of the mandrel body 1, and the outer peripheral surface of the inner ring 14 is a tapered surface corresponding to the tapered surface of the guide ring body 10. The inner ring 14 can be extracted only on the inner end side of the guide ring main body 10 by fitting both the tapered surfaces together. Moreover, the cylinder part 11 in this example is the same as that of what was demonstrated in FIG. 3 except the point extended from the inner side ring 14 integrally.
[0043]
In the case of the third example, if the cylindrical portion 11 is pulled and the guide ring 3 is retracted along the drive shaft 2, the guide ring 3 is cut together with the cutting end portion of the roving as in the second example of FIG. Can be removed. Particularly in this example, after the guide ring 3 is removed in this manner, the inner ring 14 is pulled out from the guide ring main body 10 together with the cylindrical portion 11, thereby being wound around the guide ring main body 10 and the cylindrical portion 11. It becomes easier to remove the cutting end of the roving. Furthermore, since the guide ring 3 of this example is attached with the magnet 5 similarly to the example of FIG.1 and FIG.3, it is the same as these that it is excellent in attachment workability | operativity.
[0044]
【The invention's effect】
The present invention is as described above, and has the following effects.
[0045]
(1) In the filament winding mandrel of the present invention in which the guide ring 3 can be attached using the magnet 5, the alignment of the guide ring 3 in the circumferential direction can be made unnecessary, and the attachment workability is good. Thus, it is easy to automate the attaching operation of the guide ring 3.
[0046]
(2) In the filament winding mandrel of the present invention including the guide ring 3 having the cylindrical portion 11, the guide ring 3 is removed together with the cutting end of the roving without removing the cutting end of the roving when the guide ring 3 is removed. Can be removed, the removal workability is good, and the removal work of the guide ring 3 can be easily automated.
[0047]
(3) In the filament winding mandrel of the present invention provided with the guide ring 3 having both the magnet 5 and the cylindrical portion 11, both the attachment workability and the removal workability are good, and both the work can be easily automated. It becomes.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view mainly showing both ends of a filament winding mandrel according to a first example of the present invention.
FIG. 2 is a front view of an end face on the outer end side showing another example of the guide ring shown in FIG. 1;
FIG. 3 is a cross-sectional view of one end of a filament winding mandrel according to a second example of the present invention.
FIG. 4 is a cross-sectional view of one end showing a modified example of a filament winding mandrel according to a second example of the present invention.
5 is a front view of an inner end side end face of a guide ring main body showing another example in the case where the key groove shown in FIG. 4 is provided. FIG.
FIG. 6 is a cross-sectional view of one end of a filament winding mandrel according to a third example of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Mandrel main body 2 Drive shaft 3 Guide ring 4 Guide 5 Magnet 6a Split piece 6b Split piece 7 Convex part 8 Concave part 9 Magnet 10 Guide ring main body 11 Tube part 12 Key 13 Key groove 14 Inner ring

Claims (6)

  In a mandrel for filament winding in which guide rings with guides protruding from both ends of the mandrel body are detachably attached, the guide ring is attracted to the mandrel body by a magnet provided on at least one of the mandrel body and the guide ring. Mandrel for filament winding characterized by being made.   The mandrel for filament winding according to claim 1, wherein the guide ring is divided into a plurality of divided pieces in the circumferential direction, and the divided pieces are integrated so as to be separable.   The mandrel for filament winding according to claim 2, wherein the split pieces are integrated by fitting a convex portion and a concave portion that can slide only in the central axis direction of the guide ring.   The mandrel for filament winding according to claim 2, wherein the divided pieces are integrated by a magnet. In the mandrel for filament winding in which guide rings with guides protruding from both ends of the mandrel body are detachably attached, the guide ring is smaller than the guide ring body with the guides protruding and the outer diameter of the guide ring body, And a cylindrical portion extending coaxially outward from the outer end side of the guide ring main body, and the guide ring main body is configured by a magnet provided on at least one of the mandrel main body and the guide ring main body. A mandrel for filament winding, characterized in that it is adsorbed on the filament.   In the mandrel for filament winding in which guide rings with guides projectingly attached to both ends of the mandrel body are detachable, the guide ring is disposed on the guide ring body with the guides projecting and the inner peripheral side of the guide ring body, An inner ring that is detachably fitted only on the inner end side of the guide ring body, and a cylindrical portion that is smaller than the outer diameter of the guide ring body and that extends coaxially outward from the outer end side of the inner ring. A filament winding mandrel, wherein the guide ring body is attracted to the mandrel body by a magnet provided on at least one of the mandrel body and the guide ring body.

Images