JPS6092811A - Manufacture of fiber reinforced laminate - Google Patents

Abstract

PURPOSE:To prevent fiber sheet laminations from separating from each other by a method wherein fiber laminates consisting in laminating fiber sheets in such a manner as to cross the fiber direction of one sheet with that of another on shape memory alloy wires are heat-treated so as to restore the memory of the end part of each wire in crooked state in order to hold the outer surface of the laminates by the crooking of the wire. CONSTITUTION:Firstly, the end part of each shape memory alloy wire 2 is memorized so as to crook in the direction enabling to hold glass fiber sheets 3. Secondly, said fiber sheets 3 are laminated successively, while being applied resin material between laminations, in such a manner as to cross the fiber direction of one sheet with that of another in order to form fiber laminates 6. Thirdly, the fiber laminates 6 are heat-treated, resulting in curing and joining and restoring the memory of the end part of each of said wires 2. Thus, the intended plastic laminates are obtained by holding the outer surface of said laminates 6 by the crooking of the wires 2.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a fiber-reinforced plastic laminate, which is formed by, for example, laminating glass fiber sheets and curing them with a resin material.

(Prior art) General fiber reinforced plastic laminates, or FRP, are formed by laminating fiber sheets and bonding them with resin.FRP formed in this way can be used as automobile parts such as leaf springs or engine mounts. When used, the repeated application of bending stress during use causes cracks in the resin-bonded portion, causing the laminated layers of the fiber sheet to separate.

(Objective of the Invention) An object of the present invention is to provide a method for producing a fiber reinforced plastic laminate that can prevent peeling between the fiber sheet laminates.

(Structure of the Invention) This invention provides 1M
Stores miscellaneous receipts so that they are bent in a direction that allows them to be retained,
A11ta sheets are sequentially laminated on this wire so as to intersect with each other to form a fiber laminate, and this fiber laminate is cured by heat treatment to restore memory and bend the end of the wire, so that the outer surface of the fiber laminate is The method is characterized in that it is a method for producing a fiber-reinforced plastic laminate held by

(Effect of the invention) According to this invention, I! Because the outer surface of the fibrous laminate is held in place by the bent ends of the wires embedded within it, even when the fibrous laminate is subjected to bending stress when used, for example, in leaf springs or engine mounts, The bent ends can counteract this, thereby reliably preventing cracks and peeling occurring between the layers of the laminate.

Furthermore, the wire rod is a shape memory alloy, and by storing the bend in advance and stretching the bend when laminating the fiber sheets, the lamination work of the fiber sheets can be facilitated. This can be done at the same time by heat treating the laminate, which simplifies manufacturing.

<Example) An embodiment of the present invention will be described in detail below based on the drawings.

The drawing shows a method for manufacturing a #A miscellaneous reinforced plastic laminate. In Fig. 1, the lower ends of a large number of wire rods 2 are welded or tied together on the upper surface side of a steel net 1 formed on a flat surface. The wire rods 2 are fixed by a fixing means and planted so as to extend upward, and the upper ends of these wire rods 2 are aligned so that they are at the same height position.

The above-mentioned wire rod 2... is formed of a shape memory alloy, and its upper end is heat-treated in advance so that it is bent in the same direction at a right angle at a position aligned with a predetermined height, so that the shape is memorized. There is.

And above) M material 2 on small steel net i ~ 1...
The glass fiber sheet 3 is laminated on the steel net 1'' from the upper surface side of the implanted steel net so as to cross the wire rod 2, that is, to pierce the wire rod 2 with the glass fiber sheet 3.

As shown in FIG. 2, the glass fiber sheets 3 are laminated one after another while applying a resin material between the laminated layers, and the amount of lamination is such that the upper end bent portions 4 of the wire rods 2 are left.

As shown in FIG. 3, the predetermined teeth (
When the lamination of a predetermined number of fibers is completed, a steel net 5 having the same shape as the steel net 1 on the lower surface side is placed on the uppermost surface to form a fiber laminate 6.

When the fiber laminate 6 constructed in this way is then heat-treated to harden and bond the resin material, the upper end bent portion 4 of the wire rod 2 is restored to its memory by this heat treatment, as shown in FIG. As shown in FIG. 2, it is bent to hold the outer surface of the fiber laminate 6 with the steel net 5 locked.

Even if bending stress is applied to the fiber laminate 6 manufactured in this way, the wire rods 2 hold the upper and lower surfaces of the fiber laminate 6 via the steel nets 1 and 5, so the laminate is Occurrence of cracks, peeling, etc. during the process is prevented, and the strength is improved.

FIG. 5 shows a leaf spring 7 formed by the above-described manufacturing method. When this leaf spring 7 is used as a cushioning material for an automobile wheel, even if bending stress is applied to the leaf spring 7, the wire rod 2 and ...reinforces the structure and prevents peeling between the laminated layers.

Although the steel nets 1.5 are used in each of the above embodiments, the steel nets 1 and 5 can be omitted by making the bent portions of the wires 2 long.

[Brief explanation of drawings]

The drawings show embodiments of the present invention, and FIGS. 1 to 4 are explanatory perspective views showing the manufacturing process of a fiber-reinforced plastic TII 1-layer body. FIG. 5 is a perspective view of the leaf spring. 2... Wire material 3... Glass fiber sheet 4... Upper end bent portion 6... Fiber laminate Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 2'''

Claims (1)

[Claims] 1. A fiber laminate is formed by sequentially laminating fiber sheets in the intersecting direction on a wire made of a shape memory alloy whose ends are memorized to be bent in a direction in which the fiber sheets can be held; A method for producing a fiber-reinforced plastic laminate, in which the ends of the wire rods are restored and bent by heat treatment to harden the fiber laminate, and the outer surface of the fiber laminate is held by the bending of the wire rods.