JPH02112826A - V-bending method for composite type laminated metallic plate - Google Patents

Abstract

PURPOSE:To easily and surely obtain a worked article which is free from folding in its V-bent shoulder part by executing bending in one stage by subjecting the metallic plate to V bending to a shallow groove by means of a 1st die and by pressing the fold generated in the shoulder part of the plate to the groove slope of the 2nd die by means of the same punch in the 2nd stage succeeding to the 1st stage. CONSTITUTION:After the composite type metallic plate 3 is set on the 1st die 1a, the punch 2 is lowered and is pressed to the valley part 1aa of the 1st die 1a and the V bending of the 1st stage is executed. The V-groove as a die 1 is already completed by the 1st die 1a and the 2nd die 1b and the groove faces on the same side of both respectively constitute the continuous one complete plane. The folded part of the shoulder part generated in the V bending of the 1st stage is positioned to the groove slope of the 2nd die 1b. The folded part is, therefore, completely corrected when the composite type metallic plate 3 subjected to the V bending of the 1st stage by the punch 2 is pressed to the complete V-groove slope of the combination die 1. The V-bent product having the prescribed shape is thus obtd.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a V-bending method for a composite laminated metal plate, which is a laminate in which a synthetic resin layer having viscoelasticity is sandwiched between outer metal plates. .

[Conventional technology]

Composite laminated metal plates consist of a laminate with a viscoelastic synthetic resin layer sandwiched between outer metal plates, and the presence of this synthetic resin layer provides excellent vibration damping and heat insulation properties, making it suitable for various devices. The demand is rapidly increasing because it is used as a constituent material in automobiles and can exhibit vibration damping, heat insulation, and other effects without the need for special equipment and can be made lighter.

However, when a composite laminated metal plate having such a structure (hereinafter simply referred to as a composite metal plate) is bent 7 times using a die 1' and a punch 2' as shown in FIG. A shift occurs between the outer metal plate 3a and the inner metal plate 3b of the plate 3, and a phenomenon occurs in which the shoulder of the die 1' bends in a so-called ``seagull shape'' (a state in which a seagull is flying), resulting in a desired shape. It was not possible to obtain a bent product.

Therefore, a 7-bending method has been proposed that prevents the occurrence of bending at the shoulder of a composite metal plate. As it descends, the composite metal plate is pressed against the left and right dies, which are applied with compressive stress by springs, and the bending process progresses while being pushed and spread, causing damage to the surface of the outer metal plate that slides with the dies, and damage to the left and right dies. There was a drawback that the balance between the spreading force due to the downward movement of the punch and the compressive force due to the spring, which the die receives, is easily lost, and the die does not slide smoothly, which tends to cause bending.

■Back side bending method (Japanese Patent Application Laid-open No. 63
-13620) is a method in which the bending part is pressurized in advance and the resin layer is processed while expelling the resin layer, but it is difficult to control the pressure that needs to be changed depending on the thickness and rigidity of the outer metal plate, and furthermore, the pressurized part There were drawbacks such as a decrease in strength due to a decrease in the plate thickness.

Problem to be Solved by the Invention The present invention solves the above-mentioned drawbacks of the prior art, and makes it possible to easily and reliably obtain a bent product with no bending at the 8 bending shoulders and no sliding on the surface. The objective is to construct a seven-bending method for composite metal plates.

[Means to solve the problem]

As a result of various studies, the present inventors divided the bending process into two stages; in the first stage, 7 bends were performed using a die with a short slope from the bottom of the V groove to the shoulder, that is, with a shallow depth; Then, by using a die that has a slope that is continuous with the slope of the V-groove of the die in the first stage, the bending that occurred in the first stage is corrected.
This first. The present invention was achieved by discovering that the above-mentioned object can be achieved by performing both the second steps in succession.

Hereinafter, seven bending methods for composite laminated metal plates according to the method of the present invention will be explained in detail with reference to the drawings.

FIGS. 1A, 1B, and 1C are schematic explanatory diagrams showing the method of the present invention in the order of steps before starting, first stage (2) bending, and second stage straightening.

In carrying out the method of the present invention, the following dice 1 and punch 2 are used.
and prepare.

Dice 1 is a combination die consisting of a first die 1a and a second die 1b, and as shown in FIG. 1(c),
A V-groove is completed when these are in a certain positional relationship.

The first die 1a includes the valley laa of this groove,
The groove slope from -aa to the shoulder of the first die 1a is short. The second die 1b has groove slopes on both sides that are continuous with the groove slopes of the first die 1a and complete a V-groove. Then, the first die la and the second die 1b move to the second position (the position shown in Figure 1 (c)) where the groove is completed, and from this second position, the trough 1aa protrudes in the direction of the punch 2. It is possible to move between the first position (for example, the position shown in FIG. 1(A)) and the first position where it is in the state. Although FIG. 1 shows a structure in which the first die 1a slides while being fitted into the second die 1b, the present invention is not limited to this. As will be described later, the composite metal plate 3 is sandwiched between the die 1 and the punch 2 and bent seven times at the first position, and the bending is corrected at the second position.

Therefore, the first die 1a has a force sufficient to bend the composite metal plate 3 seven times against the pressing force of the punch 2 at the first position. This first position may be a movement range in which the first die 1a moves toward the second position while decreasing the degree of protrusion while the first die 1a has its valley portion 1aa protruding. 1a moves to the second position while resisting the pressing force of the punch 2 (hereinafter, this method may be referred to as a movement suppression type). In the case of this movement suppression type, a counterforce is applied to the first die la. A coil spring lab or a hydraulic cylinder, such as a rotary coil spring, is used to apply the punch. A mechanical method may also be used in which the position changes regardless of the Further, the first position may be a fixed position, and in this case, the punch 2 is moved by increasing the pressing force.

Immediately after the suppression at the above-mentioned fixed position ends, the first die is 1.
a moves to the second position (hereinafter, this method may be referred to as fixed position suppression type), and in the second position, the first die 1a is fixed or at least prevented from moving further back from the second position. has been done.

As shown in FIG. 1(c), the punch 2 has a V-shaped apex angle that is the same as the V-groove of the combination die 1, and the slope of the V-shape is at least the groove slope of the first die 1. Prepare something longer than that.

The method of V-bending a composite laminated metal plate according to the method of the present invention is carried out as follows.

First, as shown in FIG. 1(a), move the first die la to the first position (in the case of the movement suppressing type, to the most protruding position), set the composite metal plate 3 on it, and then punch 2
is lowered and the composite metal plate 3 is pushed into the valley portion 1aa of the first die 18 as shown in FIG. In the first stage V-bending, the pressing is completed by the time the second position is reached, not only in the fixed position pressing type but also in the moving pressing type, so in both cases, the composite metal plate 3 is inserted into the second die 1b. Figure 1 (
As shown in b), bending occurs at the shoulder of the groove of the first die 1a.

After the first stage V-bending is completed, the first die 1a is moved to the second position while the punch 2 is still pushing the composite metal plate 3 into the first die 1a. In the case of the press type, the movement of the first stage V-bending is simply completed, and in the case of the fixed position press type, the position of the first die 1a is released from fixation and moved to the second position). In this state, the V-groove of the die 1 is completed with the first die 1a and the second die 1b, and the groove slopes on the same side of both are each a continuous complete plane.
The bent portion of the shoulder caused by the first stage MV bending is located on the groove slope of the second die 1b. Therefore, punch 2 is the first
When the composite metal plate 3 that has undergone stage V bending is pressed against the completed V-groove slope of the combination die 1, the bent portion can be completely corrected and the predetermined shape can be formed as shown in FIG. This results in a V-bending product. The first stage V bending process and the second stage straightening process are not only in the case of the movement suppression type but also in the case of the fixed position pressing type.
Since the bending is almost instantaneous, each case can be carried out as one substantially continuous process.

Note that the composite metal plate 3 to which the method of the present invention is applied does not matter what type of outer metal plate or synthetic resin it is made of. For example, polypropylene, butadiene rubber, polyvinyl chloride.

Synthetic resin layer such as polyethylene, nitrile rubber, polyisoprene, etc. and surface treated steel plate, stainless steel plate, aluminum plate, aluminum alloy plate.

Composite metal plates laminated with outer metal plates such as copper plates, copper alloy plates, titanium plates, and titanium alloy plates can be applied.

〔Example〕

Examples and Comparative Examples A combination die 1 having a structure similar to that shown in FIG. Distance between (same below) 5m, groove width of second die 1b 10m, moving press type]
and Punch 2 [tip radius of curvature Omm, width 10nwm] was used to punch an outer steel plate (surface-treated steel plate) with a thickness of 0.6+nm.
A composite metal plate 3 having a total thickness of 1.25+rn, which is formed by laminating a synthetic resin layer of 0.05 m thick and made of polybutadiene rubber, was subjected to V-bending according to the method of the present invention described above. In addition, the conventionally used die 1' [bending angle 90°, groove width 5 mm] and punch 2' [bending angle 90°
, tip radius of curvature OWll.

The same composite metal plate 3 was subjected to V-bending according to the conventional method using the same composite metal plate 3 (width Low).

As a result, the bending product obtained by the conventional method has a bending angle of 15° to 21° at the part corresponding to the shoulder of die 1'.
In contrast, in the case of the method of the present invention, a bending angle of 15° to 21° was once formed at the shoulder of the first die 1a in the first stage V-bending process. However, the bent part was straightened in the subsequent second stage straightening process, and the resulting V-bent product had no folds. No bending was observed.

〔Effect of the invention〕

As explained above, according to the method of the present invention, a composite laminated metal plate with a resin layer interposed in the middle is processed by die and punch.
In the bending process, in the first step, a first die with a shallow groove is used to perform a V-bend, and in the second step, the bending that occurs at the shoulder is corrected by pressing the groove slope of the second die with the same punch. By performing the first stage V-bending and the second stage straightening in a continuous process, it is possible to extremely easily and reliably obtain a V-bent product with no bends in the shoulders of the first stage V-bending. I can do it.

Therefore, it is now possible to use a composite laminated metal plate with a resin layer interposed in the middle for applications that require V-bending, which was previously difficult to apply due to the bending of the shoulder of the die. Composite laminated metal plates with a resin layer interposed between them are used as constituent materials for a wide range of equipment, including soundproofing, vibration damping, and
The industrial value of the present invention, which enables effects such as prevention of resonance to be brought about by reducing weight, is extremely large.

[Brief explanation of drawings]

Figures 1 (a), (b), and (c) are schematic explanatory views showing the method of the present invention in the order of steps before starting, first stage MV bending, and second stage straightening, and Figure 2 is a conventional It is an explanatory view of V-bending processing of. 1...Dice 1a used in the present invention...First die laa...Tani Jab...Coil spring ■b...Second die 1'...Conventional Dice 2...Punch 2' used in the present invention...Conventional punch 3...Composite type laminated metal plate (composite type metal plate) 3a...
...Outer metal plate 3b...Inner metal plate first surface (A)

Claims (1)

[Scope of Claims] 1. When V-bending a composite laminated metal plate in which a synthetic resin layer is sandwiched between outer metal plates using a die and a punch, a first die including a trough of a V-groove as the die; a second die having groove slopes on both sides that complete the V-groove continuous with the groove slope of the first die, and a second position where the first die completes the V-groove with the second die; A movable combination die between the second position and the first position with the valley protruding in the direction of the punch is used as a punch with a V-shaped slope having the same apex angle as the V groove of the combination die. is longer than the groove slope of the first die, and with the first die positioned at the first position, the composite laminated metal plate is pushed into the groove of the first die with the punch, and the first step V is performed. Bending is performed, and then, in this state, the first die is placed in the second position and the punch is pressed to a position where the completed V-groove slope is formed, thereby correcting the bend caused by the first stage V-bending. A method for V-bending a composite laminated metal plate, characterized in that: 2. A claim in which the first position is a movement range in which the first die is moved toward the second position while reducing the degree of protrusion of the trough, and the first stage V-bending is performed while moving in the movement range. 1. The method for V-bending a composite laminated metal plate according to 1. 3. The V-bending method for a composite laminated metal sheet according to claim 1, wherein the first position is a fixed fixed position and the V-bending process is moved to the second position immediately after the first stage V-bending is completed at this fixed position.