JPS6313620A - Bending method for resin laminated metal plate - Google Patents

Abstract

PURPOSE:To prevent the bending phenomenon caused at bending time and to obtain the product in the necessary shape by performing a bending with elongating a metal plate of the bending outer side in the bending peripheral direction by giving it an ironing, in case of the bending of a resin laminated metal plate. CONSTITUTION:When a punch 7 is descended by setting a resin laminated metal plate 8 on bending dies 5, 5', the plate 8 becomes to spread the bending dies 5, 5' to the right and left by being bent by the tip of the punch 7. The die gap becomes bigger according to the descent of the punch 7, but since the state of the force into the arrow mark direction being applied by springs 4, 4' as it is exists, an ironing is applied on the bending outer side skin steel plate of the plate 8 with this force and it is elongated in the bending peripheral direction. In case of an ordinary bending, therefore, a smooth deformation is allowed at the resin layer outer side as well receiving a compression stress in the bending direction and no shearing deformation is caused on the resin layer. In this way, the bending phenomenon on the bending part is prevented and an optimum shape is obtainable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for bending resin-laminated metal plates, which are laminated by adhering and sandwiching a synthetic resin layer between metal plates.

In recent years, there has been a demand for resin-laminated metal plates in which a synthetic resin layer is sandwiched and bonded between metal plates made of iron, aluminum, copper, or alloys thereof, in order to improve the soundproofing, vibrationproofing, or heat-insulating properties of metal plate members, and to reduce their weight. is rapidly increasing.

By the way, when manufacturing metal plate products, usually "9"
Bending processes such as 0° ■ Bending T°'' are essential, and the quality of the bending process often determines the value of the product. This also applies when manufacturing products made from resin-laminated metal plates as described above; This has the extremely inconvenient problem of not being able to obtain a product with a satisfactory shape.

For example, when bending a single metal plate 1 using a bending die 2 and a punch 3 as shown in FIG.
As shown in the figure, although the well-known spring hack phenomenon can be seen (in Figure 4, the broken line represents the shape when a forming load is applied, and the solid line represents the shape after the load is removed), it is relatively easy to produce a product with the desired shape. But you can get ':
When the resin laminated metal plate described above was subjected to the usual press bending process, the flange part bent, as shown in Figure 5, in addition to the spring breakage, and a product with the desired shape could not be obtained. It is.

<Prior art and its problems> For this reason, in the past, press bending was applied to resin laminated metal plates in one step.
-1, in the case of bending using the usual mold, straighten the bent part of the 1st bar by 3L (pressing it at the dead center) 1j. Although a two-step process was adopted, complete correction still cannot be expected.
How can we increase the complexity of the construction process by increasing the number by 11?

The thickness of the surface metal plate (hereinafter referred to as "F") constituting the metal truss (hereinafter referred to as "F") The bending part of the resin laminated metal plate is changed by applying a thin force to the front and back, and bending the metal plate with the metal plate on the outside. Or, by forming a groove around it (the groove absorbs the ζ1 force generated during bending), the mutual position of the metal plates is fixed and the bending force I+ is applied.
1'i method [JP-A-60-174215], (
+1) Method of bending the T1 side skin metal plate of resin ■1°1 layer gold 1i1i jlQ while protruding (=I), -gay ('pulling 7\stretching 7 [Erekai Show 1i 0 2,'
t I No. 525], etc., but these still required complicated man-hours during processing and inevitably caused scratches on the product surface.

From the above-mentioned viewpoint, the present inventors have developed a process that is simple and can be easily and smoothly carried out without causing quality deterioration factors such as surface defects on bent products. In order to find a bending method for resin-laminated metal plates that can be bent, we first went back to the law book and conducted a basic study on the bending phenomenon of the flange part that occurs when bending resin-laminated metal plates. The bending phenomenon is not observed at all in metal-to-metal laminates like crat steel sheets, even if they are made of the same composite material.
It has been found that this phenomenon is unique to "laminated materials having intermediate layers with completely different strengths" such as the resin laminated metal plates described above, and is caused by shear deformation occurring in the intermediate layers.

In other words, when a single metal plate is bent with fixed pinch score lines as shown in Fig. 6 (al) 1, . hold °
C [In contrast to U7, a resin laminated metal plate with a resin layer in the middle exhibits a radial shape as shown in Figure 1 (11) (
, 1. Even if scored lines are inserted as shown in Figure 7 (-1), if the bending process is performed as shown in Figure 7 (-1), each scored line will be bent as shown in Figure 7 +h+. It is clear from the following facts that bending of a resin-laminated metal plate I'tr 4.1 causes shear deformation in the intermediate resin layer, but the dirt is caused by the interaction between the metal and resin. This occurs because the strength differs by ◇:1;, and this shear deformation occurs at the bending part of the resin layer in the direction of 5'-: on the inside and side as shown in Figure 8. A force (in the opposite direction) will act on the part of the resin layer bent away from the bent part. +'!It Lll 1'
If the force that is causing the river is dissolved lH], then j', l 1 (
stomach. , the second result was slightly less than the bending part IIM +
This appears as a bend in the resin laminated metal plate at point 11, so ().

4f, bending is done by placing two metal plates together at 11'L, as shown in Figure I-5 (C), which occurs if the edges shift, but the bending phenomenon does not occur. Does not occur.

This also shows that the bending phenomenon of the resin laminated metal plate is caused by shear deformation due to the presence of the resin layer.

Therefore, based on these facts, the inventors of the present invention
As a result of further research based on the recognition that it is essential to suppress shear deformation of the resin layer in order to achieve favorable bending of resin laminated metal plates without causing unwanted shape deformation. ``When bending a resin laminated metal plate, when the outer metal plate is bent and stretched in the circumferential direction, the outer part of the resin intermediate layer (see Fig. 8), which receives compressive stress during normal bending, Since it deforms relatively freely following the elongation of the board without being subject to much restraint, shear deformation of the IH fat layer is suppressed, and the desired product can be easily and reliably produced without causing unwanted shape deformation. 2. Stretching of the outer metal plate in the bending circumferential direction is performed during the bending process to give the outer metal plate a stiffening degree.
If carried out by this means, there will be no flaws on the surface of the metal plate, and the IJ elongation deformation will be extremely smooth and stable. It's from people.

This was done based on 1.1-Kiyaku, (,), and when bending a resin laminate with a resin layer sandwiched between metal plates, 1. Applying "strain" to the board and bending the urgent board while stretching it in the circumferential direction, - 1
, Eliminate shear deformation of the resin layer, and easily create bent products without unwanted deformation or surface 1iiL! L
``J r ij'') I tried to convey the characteristics of the person I).

In addition, when performing bending JIll-1 in steps 1 and 2, it is also a good idea to heat the bent portion of the resin laminated metal plate (heating temperature number, 1
10 (V).This is because heating causes the resin's k-shape If to become smaller, making it easier to follow the elongation of the outer metal plate. be.

Now, FIG. 1 shows an example of the implementation status of the method according to this invention for a 4'41-year-old elementary school student! j This is a schematic diagram, but the method of this invention is as follows:
For example, as shown in FIG. This can be carried out extremely easily by using a bending die consisting of 7.

In FIG. 1, when the resin laminated metal plate 8 is set on the bending dies 5, 5' and the punch 7 is lowered, the resin laminated metal plate 8 is bent by the tip of the punch 7 while the resin laminated metal plate 8 is bent by the bending dies 5, 5'. will be pushed to the left and right. As the Honchia descends, the gap between the dies becomes wider, but since the force in the direction of the arrow is still applied by the springs 4 and 4' [Fig. 1(b)], this force At this point, the bent outer skin steel plate of the resin laminated metal plate 8 is subjected to "straining" and is stretched in the circumferential direction of the bend.

Therefore, in the case of normal bending, smooth deformation is allowed even on the outside of the resin layer that receives compressive stress in the bending direction, and shear deformation does not occur in the resin layer, and even after the bending process is completed, the flange part does not bend No phenomena occur. The bending deformation state of the resin layer at this time is 1, .) in Fig. 2, which is the cause of the bending phenomenon.
Since l'4 &;l: /l is not the same, a bent product with an appropriate shape can be obtained stably and easily.

In addition, the power of the inventions 1 and 2 can be applied to resin-laminated metal plates, such as polypropylene, polycorner, polyisoprene, nitrile, etc. Steel plate 5114 or copper alloy plate on the resin layer,
Aluminum J, ROHMEL MINI 1° J, those made of laminated skin metal plates such as alloy plates, etc. (1.
It can be an elephant.

Next, 1. Rigo's invention will be specifically explained in Examples.

<Example/Example 1 A normal V-bending type and a 1° scoop core type (
= l O) Using a V-bending die, bend a stack of steel plates with a thickness of 0.22 m and a resin (Vorip 1,1 dilene) intermediate layer thickness of 0.32 m and a diameter of 0. .21 90°V bending process at 7k.

As a result, when a normal V-bending die was used, the bending angle of the flange was lθ ~ 15°, whereas when using a ■ bending die with a sliding core die, it was bent while ironing. According to the method of the present invention, the bending angle was less than the above-mentioned bending angle, and the bending phenomenon could be sufficiently suppressed.

Example 2 The thickness of the skin steel plate was 0.35 m by using a normal V bending die and a bending die with a sliding core shown in Fig. 1.
A laminate with a resin (polypropylene) intermediate layer thickness of 0.22 mm is bent at 90° with a bending radius of 0.2 mm, with the 0.35 m5 thick skin steel plate on the outside.
■It was bent.

As a result, when using a normal V-bending type, the bending angle of the flange was 17 to 23 degrees, whereas
According to the method of the present invention, in which the material was bent while being strained using a V-bending mold of the slide core type A.lambda.j, the bending angle was less than 100 degrees, and the bending phenomenon could be sufficiently suppressed.

<Effects of the Invention> As explained in 1 above, according to the invention in 2, bending of resin laminated metal (i) 1' and sometimes bending 7 can be easily and easily prevented by C4 2 prevention 11. However, due to the bending phenomenon, application was avoided (resin laminated metal + IJ can also be used for various applications), but it has become possible to use various facilities and equipment. It tends to be extremely effective in industry, such as reducing l- and -1 nods (-
) will be done.

[Brief explanation of the drawing]

FIG. 1 shows a method of bending a resin laminated metal plate according to the present invention.
Give an example J' 41! is a schematic diagram, and Figure 1 (+1)
Figure 1 shows the state before [addition]2, and Fig. 1 shows the state after [addition]2. Figure 11-1 is an explanatory diagram showing the state of deformation of the resin layer at the bending part. Figure 4 shows the spring hack phenomenon caused by V bending of the Z pressure plate, and Figure 5 shows the problem of bending of the tree 11i + laminated metal plate.
FIG. 6 is a schematic diagram showing the bending phenomenon in L2, and is an explanatory diagram showing the deformation state during bending of a single metal plate.
Figure 6 (al) shows the state before bending, and Figure 6 (l) shows the state after bending. Figure 7 is an explanation showing the state of deformation of the resin laminated metal plate during bending. In the figure, Figure 7 (al shows the state before bending, and Figure 7 (lI) shows the state after bending. Figure 8 shows the resin layer that falls during bending of the resin laminated metal plate. Explanatory diagram showing the deformation behavior of
FIG. In the drawings, 1... Single metal plate, 2.5.5'... Bending guide, 3.7... Punch, 4... Spring, 6...
- Gui holder, 8...Resin laminated metal plate.

Claims (1)

[Claims] A resin laminated metal plate characterized in that when bending a resin laminated plate in which a resin layer is sandwiched between metal plates, the bending process is performed while stretching the metal plate in the circumferential direction by applying strain to the bent outer metal plate. bending method.