JPS60120047A - Method of joining composite board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a joining method for interconnecting composite plates in which a synthetic resin layer is interposed between two metal plates.

(Prior art) Structures that are connected to high-speed rotating machinery or equipment that is subject to impact are strongly affected by vibrations, so one of the countermeasures is usually to create a composite structure between two layers of metal plates that suppresses vibrations. A composite plate with a resin layer interposed is applied, and when this composite plate is formed into a cylindrical shape according to the purpose, or when two flat composite plates are connected, the composite plate is used as shown in Fig. Connect the plate ends a and b directly to each other and make a short circuit connection C between the metal plates.
After providing 1d, spot welding W is performed using electrodes e and f.
doing. However, this spot welding W
Because they are not all welded together, there is a slight gap between the mating surfaces q, so if water gets wet, the water will seep into that gap and cause jostling, which will reduce the strength of the joint. There is a problem. In an attempt to solve this problem, some methods use spot welding by interposing a sheet-like synthetic resin plate prepared in advance on the mating surface when joining two composite plates, but this increases cost and man-hours. for,
There is also the problem that it is undesirable from the viewpoint of productivity, and there are still issues to be solved.

(Object of the Invention) In view of the above-mentioned problems of the conventional art, the present invention has been developed so that the joint of composite plates can be easily joined, there is no difference in level after joining, and the gap at the joint can be sealed with molten resin during welding. It is an object of the present invention to solve the above-mentioned problems by doing as follows.

(Structure of the Invention) The method for manufacturing a composite plate of the present invention provides a method for manufacturing a composite plate in which a synthetic resin layer is interposed between two metal plates. A plurality of the steps are provided, and each of the stepped portions is stacked on top of the other such that the stepped portion synthetic resin layer is interposed between the stepped portion metal plates, and then a short circuit is provided between the metal plates at the stepped portion of the rain plywood. By pressing an electrode against the metal plate of the stepped portion and performing welding, the synthetic resin layer is melted by welding heat, and the molten resin joins and seals the plywood after rain.

(Example) The present invention will be described below with reference to the drawings.

FIG. 1 shows the procedure for forming the stepped portion 2 of the composite plate 1.
The composite plate is laminated with a synthetic resin layer 5 interposed between two metal plates 6.4.

First, a portion 6 of the metal plate A on one side of the end of the composite plate 1 is removed to form a stepped portion 2 consisting of two layers, the stepped portion metal plate 7 and the stepped portion synthetic resin layer 8. In addition, in this example, a case is described in which the metal plate on either side of the laminated composite plate 1 is removed to form the stepped portion 2, but instead of this, when manufacturing the composite plate 1, The lamination molding 1 may be performed with the metal plate 3 on one side offset from the edge 9 of the composite plate 1 by the length necessary to form the stepped portion 2.

Next, the two composite plates 1a, 1 with the above-mentioned stepped portion 2 formed thereon are
b, and each stepped portion 2a, 2b is attached to the stepped portion metal plate 7a.
Step synthetic resin layer 8a between #7b.

8b, and then a short-circuit connection 1o is provided between the step metal plates 7a and 7b at the step portion 2 a m 2 b of the rain plywood 1a and 1b, and a spot welding electrode 11.12 is placed between the step metal plates 7a and 7b. Both step metal plates 7 a *
7 b and pressurize it.

By pressurizing the electrodes 11.11, the current flows through the stepped metal plate 7.
a * 7 b, the vicinity of the metal plate is heated,
The synthetic resin layers 8 a e 8 b are melted, and the molten synthetic resin 14 is bonded to the composite plate 1 by spot welding electrodes 11 and 12.
The end face 1 of plywood 1 a tlb after rain due to the pressurizing action of a and 1 b
It is pushed out through the gaps between 5 and 16 and 17 and 18,
The gap between each end face is filled.

As a result, the synthetic resin layer 5 at the stepped portion 2 a * 2 b is connected to both sides of the synthetic resin layer 5 a + - 5 b
Since the thickness is reduced to almost the same as that of the composite plate 1 a
As shown in FIG. 3, the slb joint is formed in an appearance with almost no steps.

If the mechanical strength of the joint is insufficient, a reinforcing member such as a batten may be provided on the side of the metal plate that does not spoil the appearance of the joint.

(Effects of the Invention) Since the present invention has the above-described configuration, the joint surfaces of the composite plates are joined and sealed by the molten resin during welding, so corrosion of the joint is suppressed and the joint is Not only does durability improve, but the surface of the joint can be formed flat, which has excellent effects such as improving the appearance.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the method of the present invention, and FIG. 1 is a longitudinal cross-sectional view showing a stepped portion of a composite plate, FIG. 2 is a longitudinal cross-sectional view illustrating a method of joining composite plates, and FIG. FIG. 7 is a vertical cross-sectional view illustrating a conventional method of joining composite plates.

Claims (1)

[Claims] (1) Prepare a plurality of composite plates in which a synthetic resin layer is interposed between two metal plates, with a step portion formed by removing a portion of the metal plate on one side, and After overlapping each other so that a stepped synthetic resin layer is interposed between the two composite plates, a short circuit is provided between the metal plates at the stepped portion of both composite plates, and welding is performed by pressing electrodes to reduce the welding heat. A method for joining composite plates, characterized in that the synthetic resin layer at the stepped portion is melted, and the stepped portions of both composite plates are bonded and sealed by the molten resin.