JPH0220553B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for winding a flexible band-shaped material, and more specifically, the present invention relates to a method for wrapping a flexible band-shaped material such as FRP prepreg or unvulcanized rubber band around the circumferential surface of a cylindrical mandrel. This invention relates to an improvement in the method of spirally winding.

Conventionally, for example, in the manufacturing process of FRP laminated shafts and rubber hoses, the circumference of a cylindrical mandrel was
When winding FRP prepreg or unvulcanized rubber strips in a spiral shape, the method used was to supply these strip materials directly onto the surface of a cylindrical mandrel. Therefore, (1) At the start of winding, as shown in FIG. 1, the tip of the strip material 1, that is, the cut edge 1a, which has been cut diagonally at a required angle as shown in FIG.
It must be pasted around the end 2a of the cylindrical mandrel 2 over the entire circumference with the cut edge 1a and the periphery of the end 2a aligned. However, it is extremely difficult to affix the cut edge 1a of the strip material 1 to the end 2a of the cylindrical mandrel 2 over the entire circumference at a predetermined position and angle with high accuracy. As a result, not only does the winding angle and pitch become irregular, leading to a deterioration in the quality of the actual product, but it is extremely difficult to automate the work of attaching the tip of the strip material at the start of winding, and it must be done manually. There is no situation.

(2) In addition, during the winding process, the tension at which the strip material is wound around the cylindrical mandrel is affected by the unwinding force of the strip material, so that an appropriate winding tension cannot be obtained.

(3) In particular, when unidirectional prepreg is used as a strip material and is wound and laminated in multiple layers, cord disturbances occur in the underlying prepreg, and this phenomenon becomes more noticeable as the winding tension is increased.

(4) Furthermore, when performing multilayer winding as described above, the diameter of the intersection of right-handed and left-handed windings becomes larger than other parts, resulting in unevenness on the surface.

The current situation is that there are problems such as these.

The present invention was developed as a result of studies to solve the above-mentioned problems.

Therefore, an object of the present invention is to attach the cut edge of a strip material in advance to a transfer roll having a diameter larger than that of the cylindrical mandrel, and then rotate this transfer roll so that the cylindrical mandrel pressed against the transfer roll is affixed on the transfer roll. An object of the present invention is to provide a method for winding a belt-shaped material having excellent flexibility, which allows the belt-shaped material to be accurately and extremely easily wrapped at a predetermined angle at a predetermined position on a cylindrical mandrel by transferring the belt-shaped material. .

That is, in the present invention, when winding a flexible band-shaped material in a spiral shape around the circumferential surface of a cylindrical mandrel, the cut edge of the band-shaped material cut obliquely at a predetermined angle is rotated at a diameter larger than that of the cylindrical mandrel. After pasting along a circumferential line perpendicular to the axial direction of the transfer roll, the transfer roll is further rotated to once spirally paste the strip-like material on the circumferential surface of the transfer roll at a desired angle. Then, a cylindrical mandrel is rotatably brought into contact with the surface of the transfer roll along its axis, and the strip material on the transfer roll is automatically transferred onto the surface of the cylindrical mandrel. The gist of the invention is a method of wrapping a strip-shaped material having the following properties.

Hereinafter, the present invention will be explained in detail by way of examples with reference to the drawings.

FIG. 3 is a perspective explanatory view illustrating a method for winding a flexible band-shaped material according to the present invention, and FIG. 4 is a side view explanatory view illustrating an embodiment of a device directly used for carrying out the present invention. .

First, an apparatus directly used for carrying out the method of winding a flexible band material according to the present invention will be explained with reference to FIG.

As shown in the figure, this device E includes a rotation device 30 for the transfer roll 3, a cylindrical mandrel support device 20 that rotatably abuts the cylindrical mandrel 2 on the surface of the transfer roll 3, and a The belt-shaped material supply device 50 supplies the belt-shaped material 1 via the transfer roll 3.

The rotation device 30 for the transfer roll 3 is rotatably supported via a shaft 32 between each side plate 31a (only one side is shown) of a stand 31 installed upright on the top surface of the base plate 10. A pulley 33 attached to one side of 32 and a pulley 35 of a motor 34 fixed on the base plate 10 are connected by a transmission belt 36, and by driving this motor 34, the transfer roll 3 is moved to a predetermined position. It is designed to be able to rotate at a predetermined speed in the direction of.

Further, the cylindrical mandrel support device 20 includes each side plate 21a (only one side is shown) of a stand 21 that is erected on the upper surface of the base plate 10 in parallel with the transfer roll 3.
The bent part 22a of the arm 22 formed in an L-shape is rotatably mounted on one side 22b of the arm 22, and the other side 22c of the arm 22 is rotatably supported on one side 22b of the arm 22. It is constructed by being pivoted to a rod 24a of a cylinder 24 attached to the base plate 10, and when the cylinder 24 is actuated to extend the rod 24a, the arm 22 rotates clockwise and the cylindrical mandrel 2 is It comes into contact with the surface of the transfer roll 3 and can rotate the cylindrical mandrel 2 as the transfer roll 3 rotates.

Further, the strip material supply device 50 includes a base plate 10
A machine stand 51 attached to the upper surface in parallel with the transfer roll 3, and two left and right guide bars 52 attached to the upper surface of this machine stand 51 in parallel to the transfer roll 3.
A moving body 53 is provided to be movable along each guide bar 52, and an unwinding stand for a strip material supply reel 54 is provided on the top of the moving body 53 so as to be swingable (can be set at a predetermined angle). 55, and a moving device 56 for the moving body 53.

In this embodiment, the moving device 56 of the moving body 53 has a screw rod 56a rotatably attached to the machine base 51, and
A pulley 56b is attached to one side, and this pulley 5
6b is connected to a pulley 57a of a motor 57 via a transmission belt 56c, while the threaded rod 56a
It is constructed by screwing together a mover (not shown) attached to the lower part of the moving body 53, and by rotating the motor 57 in a predetermined direction, the screw rod 56a is rotated, and accordingly, the screw rod 56a is rotated. Thus, the moving body 53 can be moved along the guide bar 52 in parallel to the transfer roll 3 at a desired speed.

In the figure, reference numeral 40 is a tension roll that applies appropriate tension to the strip material 1 supplied to the transfer roll 3.

Next, the process of spirally winding the strip material 1 around the outer peripheral surface of the cylindrical mandrel 2 will be explained with reference to FIGS. 2 to 4.

When winding the strip material 1 in a spiral shape on the cylindrical mandrel 2 at the winding angle A, material waste and product waste are minimized, and the cut edge 1a of the strip material 1 is wrapped around the transfer roll 3 at the beginning of winding. In order to facilitate the above alignment, it is necessary to cut the tip of the strip material 1 at a predetermined angle as shown in FIG. The following relationship holds between the diameter D of the cylindrical mandrel 2, the width W of the strip-shaped material, the winding angle A of the strip-shaped material, and the angle B of the cutting edge 1a at the tip: Strip-shaped material width (W) = Cylindrical mandrel Diameter (D) x π x cosA (wrapping angle) ...... (1) Tip angle (B) = 90° - wrapping angle (A) ...... (2) However, the above band material width (W) calculation Equation (1) is for a single butt spiral, and 2 for a double winding.
In the case of double or triple winding, the width of the material is three times as large, or in the case of n-fold winding, the width of the material is n times as large. However, the method according to the present invention is of course not limited to butt spirals, and can also be used in the case of multiple windings. However, the following description describes the procedure for the case of a butt spiral.

In Fig. 2, a strip material 1 with a width of πDcosA
By cutting the tip at an angle of (90°-A), the length πD of the cut edge 1a can be obtained.

That is, a cut edge 1a having a length equal to the circumferential length of the cylindrical mandrel 2 is obtained. Thereafter, in FIG. 4, the material 1 whose tip has been cut is placed on the unwinding stand 5.
Set to 5. By changing the mounting angle of this unwinding stand 55, a predetermined winding angle A can be obtained. The tip of the material 1 is pulled out from the unwinding stand 55 set at a predetermined angle, and the cut edge 1a is placed at a predetermined position on the transfer roll 3 having a diameter at least three times that of the cylindrical mandrel 2. Set on the circumferential line of the transfer roll perpendicular to the axial direction. If, for example, a transfer roll 3 having a diameter six times the diameter D of the cylindrical mandrel 2 is used, the cutting edge 1a of the material 1 can be set by just crossing over the transfer roll at 60 degrees. Note that as means for setting the cut edge 1a of the material 1 on the transfer roll 3, there is a means (not shown) for vacuum suctioning the material from the inside of the transfer roll 3, but the present invention is of course not limited to this.

After the cutting edge 1a has been set on the transfer roll 3, the cylinder 24 is operated to bring the cylindrical mandrel 2 into contact with the transfer roll 3, and the drive motor 34 of the transfer roll 3 and the drive motor for traversing the strip material supply device 50 are activated. Start up 57. This causes the band-shaped material 1 to be wound around the cylindrical mandrel 2. To explain this operation in more detail, the transfer roll 3 is rotated by starting the drive motor 34 for the transfer roll 3. Further, since the cylindrical mandrel 2 pressed against the transfer roll 3 by the cylinder 24 is rotatably attached via a bearing, it starts rotating at the same time due to the frictional force with the transfer roll 3. Due to the rotation of the transfer roll 3, the cut edge 1a of the strip material 1, which has been transferred to the contact line between the transfer roll 3 and the cylindrical mandrel 2, leaves the transfer roll 3 and wraps around the cylindrical mandrel 2.

The means to ensure the transfer, that is, the transfer, is to use a cylindrical mandrel 2 and a transfer roll 3.
Examples include, but are not limited to, making a difference in the mold releasability of each surface of the transfer roller, or blowing air (not shown) from the inside of the transfer roll 3 toward the cylindrical mandrel 2 at the transfer position. It's not a thing.

Next, regarding the lateral movement of the unwinding stand 55, the screw rod 56a is rotated by starting the lateral movement drive motor 57, and the movable body 53 starts lateral movement. Since the screw rod 56a and the guide bar 52 are attached parallel to the axis of the transfer roll 3, the unwinding stand 55 moves laterally in parallel to the transfer roll 3. Further, the motor 34 or 57 is controlled so that the following relationship always holds between the rotational distance X of the transfer roll 3 and the lateral movement distance Y of the unwinding stand 55.

Y=XcotA As described above, in the present invention, a cylindrical mandrel is rotatably brought into contact with the surface of a transfer roll which has a larger diameter than a cylindrical mandrel and is rotatable along its axis, and is first cut diagonally at a required angle. The cut edge of the strip material is pasted along the circumferential line of the roll perpendicular to the axial direction of the transfer roll, and then the transfer roll is rotated to apply the strip material to the surface of the transfer roll. Since the belt-like material on the transfer roll is pasted spirally at a predetermined angle and is automatically transferred onto the circumferential surface of the cylindrical mandrel, the following effects are achieved.
In other words, the cut edge of the strip material can be pasted on the transfer roll at the start of winding, and this work is extremely easy compared to pasting the entire circumference of a conventional cylindrical mandrel.
Not only can workability be greatly improved, but it also becomes possible to accurately and reliably attach the tape at a predetermined position and angle, and it is possible to eliminate irregularities in the winding angle and pitch.

In the conventional method, pasting the cut edges of the strip material was difficult and had to be done manually, but this method allows automation.

By changing the pressing force of the cylindrical mandrel against the transfer roll, the winding tension can be freely controlled. Furthermore, since the unwinding force of the strip material and the winding tension can be separated, the winding is not affected by the unwinding force.

Since the belt-shaped material is transferred and wound onto the cylindrical mandrel by contact between the transfer roll and the cylindrical mandrel, even when winding multiple layers of a material that is prone to yarn disorder, such as unidirectional prepreg, disorder of the lower layer cord will not occur. Moreover, it is possible to obtain a good molded product with less influence from tension.

Because the transfer roll and the cylindrical mandrel come into contact with each other for transfer winding, the cylindrical mandrel itself also plays the role of a status tier, which can eliminate the unevenness at the intersection of right-hand and left-hand windings during multilayer winding, and improve the interlayer It becomes possible to tightly wrap the molded product, and it is possible to obtain a molded product with good quality and appearance.

[Brief explanation of drawings]

Fig. 1 is a perspective explanatory view showing a state in which a strip material is wound around a cylindrical mandrel by a conventional method;
The figure is a plan view showing an example of cutting the tip of a strip material.
FIG. 4 is a perspective explanatory view illustrating a method of winding a flexible band-shaped material according to the present invention, and FIG. 4 is a side view explanatory view showing an embodiment of an apparatus directly used for carrying out the present invention. 1... Strip material, 1a... Cutting edge, 2... Cylindrical mandrel, 3... Transfer roll.

Claims (1)

[Claims] 1. When winding a flexible strip-shaped material in a spiral around the circumferential surface of a cylindrical mandrel, the cut edge of the strip-shaped material cut diagonally at a predetermined angle is transferred to a transfer roll that can rotate with a diameter larger than that of the cylindrical mandrel. After pasting along the circumferential line perpendicular to the axial direction of A flexible band-shaped material, characterized in that the cylindrical mandrel is rotatably brought into contact with the surface of a roll along its axis, and the band-shaped material on the transfer roll is automatically transferred to the surface of the cylindrical mandrel. How to wrap.