JPS6213913B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for bending bonded metal-resin laminates.

Boards made by gluing and laminating metal plates and appropriate synthetic resin boards have traditionally been widely used for the tops of desks, reception counters, etc.; As a result, it became necessary to bend the laminate.

Conventionally, in order to bend a laminate as described above, for example, when forming a laminate, a core material formed to a desired curvature is loaded in advance into a desired part of a metal plate, and this part is bent, and this bending process is performed. A metal plate having a flat part and a flat part is coated with an appropriate adhesive, and a flat synthetic resin plate is bonded while heating and bending a part of the metal plate corresponding to the bending part. Since the flat parts of the wafer are also bonded, there is a problem in that it takes time and effort and productivity is low.

On the other hand, simply bending a laminate made by bonding a flat metal plate and a synthetic resin plate has the disadvantage that the resin plate bonded to the metal plate may crack or the bonded portion may peel off.

This happens when the above laminate is bent at room temperature.
It is thought that cracks and peeling occur due to the synthetic resin plate being bent on the outside of the bend being excessively stretched and deformed while being bent, and the adhesive on the bottom of the synthetic resin plate solidifying. It will be done.

In view of this, the present invention provides a method that can bend a laminate of metal plates and resin plates that have been adhesively laminated in a flat state without causing the resin plates to crack or peel. This is a flat laminate consisting of a metal plate and a synthetic resin plate that are bonded together with an adhesive.The part to be bent is heated by an appropriate heater, and the heating After softening the synthetic resin plate and adhesive of the part, apply a bending die corresponding to the length of the part you want to bend to the metal plate side of the part you want to bend, and then insert the bending die from the synthetic resin plate side. The laminate is bent according to the bending die by pressing a pressure roll having a length corresponding to the bending die against the bending die and moving the roll along the cross-sectional shape of the bending die. It is something.

Next, an example of the method of the present invention will be described with reference to the drawings.

The figures sequentially show processing states according to the method of the present invention, and an example of the configuration of an apparatus for carrying out the method of the present invention is as follows.

1 is a laminate plate to be processed by the method of the present invention, which is made by completely bonding a flat metal plate 1S and a flat synthetic resin plate 1P with an adhesive. Reference numeral 2 denotes a support stand on which the laminate 1 is mounted and supported during processing, and the laminate 1 is placed on the stand 2 with the resin plate 1P facing down.
supported above. 3 is a push plate that holds the laminate 1 on the support base 2, and a bending die 4 that is replaceable at the front end.
is attached. 5 is a heater that is applied from above and below to the portion 1B to be bent in the laminate 1 which is held between the support base 2 and the push plate 3 except for the front end side (that is, the portion 1B to be bent); In this embodiment, the heater 5 is arranged so as to be movable back and forth.

On the other hand, a press roll 6 for pressing the laminate 1 toward the bending die is rotatably disposed on the lower surface side of the laminate 1 immediately before the support base 2, and is movable up and down and back and forth. It has been done.

In this embodiment, the vertical movement of the pressure roll 6 is achieved by supporting the bearing portion of the roll 6 by a vertical driving cylinder 6V and by stroking the cylinder 6V. The forward and backward movement of the cylinder 6H is effected by the horizontal stroke of the drive cylinder 6H at its bearing portion.

Further, when the roll 6 is brought into contact with the synthetic resin plate 1P side of the laminate 1 and moved upward by the operation of the cylinder 6V, the roll 6 is ensured to roll on the synthetic resin plate 1P. In order to do this, a gear (not shown) that makes the outer diameter of the roll 6 a pitch circle
is provided coaxially with the roll 6, and the gear is meshed with a rack (not shown) provided along the cylinder 6V.

Next, an example of the operation of the apparatus configured as described above will be explained.

A flat laminate 1 that has been completely bonded in advance with a heat-softening adhesive such as a synthetic rubber adhesive is placed with the synthetic resin plate 1P side facing down at its front end, i.e.
The portion 1B to be bent is placed on the support base 2 with an appropriate amount protruding from the front end, and the heater 5 is moved to apply the portion 1B to be bent from above and below to heat the portion 1B at approximately 140 to 150°C. do.

Due to this heating, the synthetic resin plate and the adhesive on the heated portion 1B are softened, so the laminate plate 1 is adjusted in its front-rear position with respect to the support stand 2, and the push plate 3 is moved downward, and the laminate plate 1 is moved to the support stand 2. After the press roll 6 is pressed against the laminate 1 and moved upward by operating the cylinders 6V and 6H, the laminate 1 is moved along the bending mold 4. However, since there is a difference in curvature between the metal plate 1S and the synthetic resin plate 1P due to their thicknesses, both 1S and 1P are bent while causing slippage on their adhesive surfaces.

In order to further press the laminate 1 along the bending die 4, the pressing roll 6 is continuously moved from the state shown in the second figure to the state shown in the fourth figure by the operation of the cylinders 6V and 6H. During this time, the roll 6
rolls on the synthetic resin plate 1P. Further, the operating direction of the cylinder 6V is switched using a limit switch, a timer, or the like.

The laminate 1 is bent along the bending die 4 by the operation of the pressure roll 6. During this process, the synthetic resin plate and adhesive, which are first heated and softened, are transferred to the bending die by the heat. 4 and press roll 6
The metal plate 1S and the resin plate 1P of the bent laminate 1 are held together by their original adhesive strength.

As described above, according to the method of the present invention, a flat laminate is formed by completely adhering the entire surface of a synthetic resin plate in advance with an adhesive that is softened by heating in the same way as a flat metal plate, and then, Since the part of the laminate to be bent is heated to soften the synthetic resin plate and adhesive before the bending process is performed, (a) the laminate can be formed using materials (metal plates, synthetic resin plates). )
This can be done in a flat state, making it easier to apply adhesive and stack materials (B) Eliminates the need for core material filled in the bending part of the laminate (C) A bending mold is used instead of the conventional core material, but this mold has the advantage of being able to select and use any mold depending on the shape of the bending process. is softened by heating and is easily plastically deformed, and the adhesive is also softened, so when mechanically bending with a pressure roll, the difference in curvature due to the thickness of the metal plate and synthetic resin plate causes misalignment. This can be absorbed by the elongation of the synthetic resin board and the softened adhesive, and since the pressure roll presses against the synthetic resin board from the synthetic resin board side, it has the advantage that no peeling or cracking occurs in the laminated part, and it is similar to metal plates. This method is extremely useful as a method for bending boards for desks and counter tops made of laminated synthetic resin boards.

[Brief explanation of the drawing]

The drawings show an embodiment of the method of the present invention, and FIGS. 1 to 4 are side views showing the bending process according to the method of the present invention. 1... Laminated plate, 1S... Metal plate, 1P... Synthetic resin plate, 1B... Portion to be bent, 2... Support stand, 3... Push plate, 4... Bending mold, 5... Heater , 6... Press roll.

Claims (1)

[Claims] 1. After heating the part of a flat laminate made of a metal plate and synthetic resin plate bonded with an adhesive where the bending process is to be performed using an appropriate heater, and softening the synthetic resin plate and the adhesive in the heated area. Apply a bending die corresponding to the length of the part to be bent to the metal plate side of the part to be bent, and apply a press roll having a length corresponding to the bending die from the synthetic resin plate side to the bending die. The laminated plate is bent according to the bending die by moving the roll along the cross-sectional shape of the bending die while pressing the plate against the side. Bending method.