JPS62149404A - Introducing of reinforcing material in centrifugal molding - Google Patents

Abstract

PURPOSE:To introduce woven fabric-like reinforcing material uniformly over the whole width at all times by a method wherein the suspending length of the reinforcing materials is made equal to the length of the material under the state that the unwound end of the material just reaches and touches the inside surface of a cylindrical mold at the point, which the extension line of the suspending end meets the inside surface of the cylindrical mold. CONSTITUTION:The end part 2A of a woven fabric-like reinforcing member 2, which is wound on a holding shaft 1, does not be fastened to the holding shaft 1. Under the above-mentioned state, the holding shaft 1 is revolved. When the holding shaft 1 is stopped after being revolved in the turning angle theta, the woven fabric-like reinforcing material 2 is in the stare unwound from the holding shaft 1 and then is displaced toward the inside surface of a cylindrical mold by the action of centrifugal force. The woven fabric-like reinforcing material 2 is smooth ly displaced onto the inside surface of the cylindrical mold 3 due to the radial centrifugal force acting to the suspending end 2A without being acted by the pressure of air flow due to the rotation of the mold 3 and, after touching, adhered along the inside surface. In addition, the suspending length is set previously so that the point T of adhesion for displacement of the woven fabric-like reinforcing material 2 to the inside surface of the cylindrical mold 3 coincides with the intersection T of the extension line of the suspending end of the woven fabric-like reinforcing material 2 and the inside surface of the cylindrical mold.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a method for adding reinforcing material in a centrifugal molding method.
More specifically, the present invention relates to improvements in centrifugal molding using woven reinforcements.

[Conventional technology]

When manufacturing fiber-reinforced pipes, a support shaft around which a woven reinforcing material is wound is arranged coaxially within a cylindrical mold, and when both are rotated simultaneously, centrifugal force acts on the woven reinforcing material. A centrifugal forming method is well known in which a woven reinforcing material is laminated at dislocations on the inner surface of a cylindrical mold to form a tube.

This centrifugal forming method can not only manufacture tubes, but also perform inner lining of metal tubes, etc., and has the advantage of having a wider range of applications than the FW method.

In this centrifugal molding method, a method is known in which a woven fabric whose full width is the axial length of the support shaft is unwound from the support shaft to form a dislocation product lΔ on the inner surface of the cylindrical mold. (For example, Special Publication No. 54-28869).

This method has the advantage that the time required for laminating is very short and is suitable for mass production.

[Problems with conventional technology]

However, in the above method, since the width of the woven reinforcing material on the support shaft becomes long, when the woven reinforcing material is released into the inner surface of the cylindrical mold due to centrifugal force, the charging speed is reduced over the entire width. It is relatively difficult to achieve uniformity, and there are problems such as disturbances in reinforcement along the coaxial direction of the formed pipe due to misalignment of input in the width direction, which adversely affects the quality of the raw L7 molded product. be.

In order to solve this problem, during the synchronous rotation of the cylindrical mold and the support shaft, during a certain initial stage, the end of the woven reinforcement material is held down by a pressing member, and when the cylindrical mold and the support shaft are rotated synchronously, Releasing the presser member and putting it in is 1! It has been proposed (Special Publication No. 56-42456, etc.).

However, disposing the presser member on the rotating support shaft not only complicates the device but also makes it difficult to time the release of the presser member.

[Problems to be Solved by the Invention] In view of the above-mentioned problems, the present invention provides a reinforcing material that can be used in a centrifugal molding process, in which the woven reinforcing material can always be introduced evenly over the entire width, and does not require any complicated wrapping. This was done for the purpose of obtaining a method of inputting.

[Technology to solve problems]

That is, the method of introducing reinforcing material in the centrifugal molding method of the present invention is to coaxially arrange a support shaft around which a woven reinforcing material is wound in a rotating cylindrical mold, and when the support shaft is rotated, the above-mentioned In a method of forming a reinforced tube by dislocating the woven reinforcing material on the inner surface of the cylindrical mold using centrifugal force acting on the woven reinforcing material,
The winding end of the woven reinforcing material wound around the support shaft is allowed to hang down without being fixed on the support shaft, and in this state, the cylindrical mold and the support shaft are rotated synchronously, and then centrifugal force is applied. to unwind the woven reinforcing material, and the unwinding end reaches the inner surface of the cylindrical mold at the intersection of the extension line of the drooping end and the inner surface of the cylindrical mold, It is characterized by having a length that makes contact.

[Effect]

In the centrifugal molding method, the deviation in the axial release timing of the woven reinforcement is due to the non-uniformity of the mass per unit width of the woven fabric, and the effect on the side surface of the woven reinforcement immediately after the rotation of the cylindrical mold and support shaft. It is thought that this is caused by a complex interaction between the two wind pressures.

Therefore, as shown in FIG. Rotate the support shaft l as shown in the figure.

At this time, the centrifugal force acting on the droop @2A of the woven reinforcement 2 acts on a zone of length l between the two drooping ends, so for example,
Even if there is non-uniformity in the minute length 64 part along the width direction of the woven reinforcement material 2, it is made uniform as a whole, and as a result, the woven reinforcement material 2 has uniformity over the entire width. Centrifugal force acts on it, resulting in two.

Moreover, at this time, a wake along the rotation direction (arrow) is generated within the cylindrical mold 3 by the hanging end 2A.

In order to generate this wake and improve the contact of the woven reinforcing material 2, which will be described later, with the inner surface of the cylindrical mold 3, it is desirable to provide a fold 2B at the end as shown in the figure.

Next, when the rotation angle of the support shaft 1 reaches 00, the rotation of the support shaft 10 is stopped, and the woven reinforcement material 2 is unwound from the support shaft l, and the inner surface of the cylindrical mold is caused by the action of centrifugal force. Dislocated in the direction.

At this time, the woven reinforcing material 2' is smoothly transferred to the inner surface of the cylindrical mold 3 due to the radial centrifugal force acting on the two hanging ends, and is not affected by wind pressure. It is attached along the surface after contact with the inner surface.

As shown in FIG. 3, the dislocation attachment point T of the woven reinforcing material 2 to the inner surface of the cylindrical mold 3 is located between the extension line of the hanging end of the woven reinforcing material 2 and the inner surface of the cylindrical mold. Set the hanging length so that the intersection point T is reached.

The reason for this is that if it is brought into contact with the inner surface of the cylindrical mold 2 before the T point, the unwinding end of the woven reinforcing material will be folded, resulting in a smooth laminated state. If the reinforcing material 2 is brought into contact with the reinforcing material 2, the centrifugal force acting on the woven reinforcing material 2 will be reduced, and the dislocation force due to its own weight will also be weakened, so the unwinding end will be disturbed and a smooth stacked state cannot be achieved.

Therefore, in order to make the above contact point, the length of the hanging end l is:
The outer diameter D1 of the support shaft 1 and the inner diameter D2 of the cylindrical mold 3 are calculated in advance based on the formula below (.

That is, in Figure 1, the length of the hanging end is l.

If the distance from the tip of the hanging end to the inner surface of the cylindrical mold 2 is 12, then 1 + + lx = /(Dz/2)" - (o+
/2) “Therefore x, = /(ox/2)” −(DI/2)” −x
.

Here, 12 is the length along the outer circumference of the support shaft l, 12=πD1 ・θ/360 Therefore, 1 + =/ (Dt/2) ” (D+/2) ”
−πD+ ・θ/(60Here, if θ=180 @, L = /(lh/2)” −(o+/2)” −πD
.

〔Example〕

Assuming that the outer diameter of the support shaft 1 is Dt -115fi, the inner diameter of the cylindrical mold 37) is 534 degrees, and θ=180°, the hanging length of the woven reinforcement material 2 is i! , = 80 mm was obtained, and centrifugal molding was repeated 11 times at a rotational speed of the support shaft l of 180 °/sec for two types of woven reinforcement materials with biaxial lengths of 330 mm and 1850 mm. However, the woven reinforcing material 2 was smoothly laminated on the inner surface of the cylindrical mold 3, and a reinforcing tube of good quality could be formed.

(Effects) As explained above, in this invention, when the woven reinforcement material 2 is transferred to the cylindrical mold 3, a very smooth transfer state can be obtained by simply providing a hanging end of a certain length. , high-quality reinforcing pipes, etc. can be formed.

Further, according to the present invention, it is not necessary to modify the conventional device at all, so it is easy to implement, and has various effects.

[Brief explanation of drawings]

FIGS. 1 to 3 are explanatory diagrams of the operation of this invention. FIG. 4 is an explanatory diagram for calculating the hanging end i.

Claims (1)

[Claims] (1) A support shaft around which a woven reinforcing material is wound is placed coaxially within a rotating cylindrical mold, and the centrifugal force that acts on the woven reinforcing material when the support shaft is rotated is utilized. In the method of forming a reinforcing tube by displacing a woven reinforcing material on the inner surface of the cylindrical mold, a winding end of the woven reinforcing material wound around the supporting shaft is fixed onto the supporting shaft. The cylindrical mold and the support shaft are rotated synchronously in this state, and then the woven reinforcing material is unwound by the action of centrifugal force, and
The reinforcing material in the centrifugal molding method, characterized in that the hanging length is such that the unwinding end reaches and contacts the inner surface of the cylindrical mold at the intersection of the extension line of the hanging end and the inner surface of the cylindrical mold. Input method.