JP2002120015A - Metal plate folding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To heighten the wear resistance of a pushing part of an upper die and a folding groove and a shoulder part of a lower die by forming a high hardness alloy layer on the pushing part of the upper die and the folding groove and the shoulder part of the lower die, to reduce the abrasion caused by the friction resistance of the upper and lower dies with a metal plate, to realize an advantage that the upper and lower dies can be used for a period longer than that of conventional dies by 3 to 5 times, and to reduce the maintenance cost of the metal plate folding device to 1/2 to 1/5. SOLUTION: In this metal plate folding device which presses the metal plate placed on the lower die having the folding groove against the folding groove of the lower die, and folds the metal plate, the high hardness alloy layer covered by the discharge surface treatment or the silicon carbide plating treatment is formed on the pushing part of the upper die and the folding groove and the shoulder part thereof of the lower die. A flexible film such as a polyester film is formed on a side surface of the upper die and a side surface and a bottom of the lower die.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for bending a metal plate using a mold comprising an upper mold and a lower mold, and more particularly to a pressing portion (a cutting edge) of an upper mold, a bending groove of a lower mold and a shoulder thereof. It is characterized by forming a high hardness alloy layer such as titanium carbide coated by discharge surface treatment etc., and, if necessary, coating the flexible film such as polyester film on the side and bottom of the upper and lower molds It is used as a bender (press brake) for bending a metal plate, a hydraulic press, a pneumatic press, a mechanically operated press, and the like.

[0002]

2. Description of the Related Art Conventionally, as a device for bending a metal plate with a metal mold, a punch-shaped upper die and a flat lower die having a bending groove are used. Press the lower mold bending groove, lower the upper mold until the bent part of the metal plate pressed by the upper mold collides with the lower mold bending groove, and bend the angle of the lower mold bending groove and the metal plate. The metal plate is bent so that the angles are the same.

[0003] The descending width of the stroke of the upper die is mechanically adjusted so that the bent portion of the metal plate pressed by the upper die does not collide with the bending groove of the lower die too much. Due to malfunction or incorrect operation, the bent part of the metal plate pressed by the upper mold collides with the lower mold groove, causing breakage, cracking, and sometimes damage to the upper and lower mold groove and the side of the lower mold However, there is a problem that the cracks are scattered around and create a dangerous state.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a high-hardness alloy layer is formed on a pressing portion of an upper die and a bending groove of a lower die and a shoulder thereof, and the pressing portion of the upper die and the bending groove of the lower die are formed. The wear resistance of the upper and lower molds is reduced by increasing the wear resistance of the upper and lower shoulders, and the upper and lower molds are used for a long period of time to maintain the metal plate bending device. The purpose is to reduce administrative costs.

Further, according to the present invention, a high-hardness alloy layer is formed on the pressing portion of the upper die and the bending groove of the lower die and the shoulder thereof, and the smoothness of the pressing portion of the upper die and the bending groove of the lower die are formed. The purpose of the present invention is to prevent the occurrence of scratches on the surface of the metal plate caused by the upper mold and the lower mold when the metal plate is bent, and to cleanly bend the metal plate.

Further, the present invention provides a flexible film such as a polyester film, a vinyl film, a fiber film, a metal film, and a metal vapor-deposited film formed on the side surface and the bottom surface of the upper die and the lower die.
Due to the failure or malfunction of the metal plate bending device, the bent part of the metal plate pressed by the upper die collides with the lower groove of the lower die. The purpose is to maintain the safety by adhering and holding the film to the membrane, thereby easily and inexpensively preventing the broken or cracked parts from scattering around.

[0007]

SUMMARY OF THE INVENTION The present invention relates to an apparatus for bending a metal plate, and more particularly to a metal plate for bending a metal plate placed on a lower die provided with a bending groove by pressing the metal plate against the lower die bending groove by an upper die. Is characterized in that a high-hardness alloy layer is formed on the pressing portion of the upper die, the bending groove of the lower die, and the shoulder thereof by discharge surface treatment or silicon carbide plating.

The present invention also provides a flexible film such as a polyester film, a vinyl film, a fiber film, a metal film, and a metal vapor-deposited film on the upper side and the lower side and bottom of the above-mentioned metal plate bending apparatus. It is characterized by being formed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of a metal sheet bending apparatus according to the present invention will be described. As shown in FIG. 1, a metal mold is formed by an upper mold 1 and a lower mold 2 which are usually used.
A V-shaped bent groove 3 is formed on the surface of the lower mold 2,
The bent groove 3 is not limited to the V-shaped groove, but may be any shape as long as it is the shape of a lower die bent groove of a conventionally used mold.

The angle of the bending groove 3 provided in the lower mold 2 is appropriately determined depending on the bending angle of the metal plate 4 to be bent, and the like, but the one shown in FIG. This is a case where the cross section of the metal plate 4 is to be bent at 90 degrees in a V-shape.

As shown in FIGS. 1 and 2, a high hardness alloy layer 5 is formed on the pressing portion 8 of the upper die 1 and the bending groove 3 and the shoulder 7 of the lower die 2 so that the upper die 1 is formed. The wear resistance of the pressing portion 8 and the bending groove 3 and the shoulder portion 7 of the lower mold 2 is improved.
As the high-hardness alloy layer 5, a high-hardness alloy layer 5 coated by a discharge surface treatment or a silicon carbide plating treatment is suitable.

As a method of coating the high hardness alloy layer 5 by the discharge surface treatment, a known discharge surface treatment method may be used. For example, the lower mold 2 is disposed in an oil solution in an electric discharge machining tank, and the lower mold 2 is disposed. An electrode made of titanium carbide (hereinafter, referred to as an electrode) is brought closer to the bent groove 3 of the lower mold 2, a predetermined voltage is applied to the bent groove 3 and the electrode of the lower mold 2, and a discharge is generated between the lower mold 2 and the electrode. The heat energy melts the titanium of the electrode,
At the same time, the oil also decomposes to release free carbon, which is chemically bonded to form titanium carbide, and the high hardness (Vuckers hardness HV 1500 to HV 25 to 25) of the titanium carbide is formed in the bending groove 3 of the lower mold 2.
00) An alloy layer (1 to 4/100 mm) is formed (a similar high hardness alloy layer 5 is formed on the pressing portion 8 of the upper die 1 and the shoulder 7 of the bending groove 3 of the lower die). Also, regarding the method of coating the high-hardness alloy layer 5 by silicon carbide plating,
A known electroless plating surface treatment method may be used.

For bending the metal plate 4, the lower mold 2
After the metal plate 4 is put on the surface of the lower mold 2, the upper die 1 is lowered to push the metal plate 4 downward toward the 90-degree bending groove 3 of the lower die 2 as shown in FIG. The bending of the plate 4 is started.

That is, the upper die 1 is lowered to press the metal plate 4 downward to be pressed into the bending groove 3 of the lower die 2, and the bent portion of the metal plate 4 pressed by the upper die 1 becomes the lower die 2.
By lowering the upper die until it collides with the 90 ° bending groove 3, the bending angle of the metal plate 4 is bent to 90 ° and the same angle as the bending groove 3 of the lower die 2.

As described above, since the upper mold 1 and the lower mold 2 are covered with the titanium carbide high hardness alloy layer 5 by the discharge surface treatment, the surfaces of the upper mold 1 and the lower mold 2 become active surfaces. When the metal plate 4 is bent, the upper surface and the lower surface of the metal plate 4 are less rubbed with the upper mold 1 and the lower mold 2, and both surfaces of the metal plate 4 are not easily scratched. Bending and furthermore, the degree of wear of the upper mold 1 and the lower mold 2 can be kept low.

When the metal plate 4 is bent at 90 degrees, the lowering of the upper die 1 is stopped, the upper die 1 is pulled up to release the pressing force, and the bent metal plate 4 is separated from the lower die 2. Then, the above operation may be repeated as necessary.

In the above-described metal plate bending apparatus, the bent portion of the metal plate 4 pressed by the upper die 1 is formed by the lower die 2.
The lower width of the stroke of the upper die is mechanically adjusted so as not to hit the bending groove 3 too hard.

However, due to a malfunction or an erroneous operation of the metal plate bending device, the bent portion of the metal plate 4 pressed by the upper die 1 collides with the bending groove 3 of the lower die 2 and the pressing portion 8 of the upper die 1 is pressed.
(Or the side surface 6), the bending groove 3 and the side surface 6 of the lower mold 2 may be damaged or cracked, or in some cases, these damaged or cracked parts may be scattered around to create a dangerous state. In the present invention, for the sake of completeness, as shown in FIGS. 2 and 3, the side surface 6 of the upper die 1, the side surface 6 of the lower die 2, and the bottom surface 10 are made of a flexible film, for example, a polyester film 9
It is preferable that the damaged portion is fixed by the polyester film 9 so as not to be scattered.

Materials for the upper mold 1 and the lower mold 2 are mold steel,
It is optimal to use bearing steel, chrome molybdenum, or the like having high hardness and high wear resistance. However, ordinary steel or ordinary steel whose surface is hardened may be used.

In order to form a high-hardness alloy layer on the upper mold 1 and the lower mold 2, in addition to the above-described discharge surface treatment, the upper mold 1 and the lower mold 2 are subjected to a silicon carbide plating treatment to form a high-hardness alloy. A layer (1 to 3/100 mm) may be coated. In addition to silicon carbide plating (plating), a process capable of forming a high-hardness alloy layer at a HV of at least 1000 ° and satisfying good adhesion conditions. Anything is fine.

As the flexible film to be formed on the upper mold 1 and the lower mold 2, a vinyl film or a fiber film other than the above-mentioned polyester film 9 may be attached, or a metal film or a metal vapor deposition film may be attached. Any other flexible film may be attached.

[0022]

According to the present invention, a high-hardness alloy layer is formed on the upper die pressing portion and the lower die bending groove and the shoulder thereof, and the upper die pressing portion and the lower die bending groove and the shoulder are formed. The wear resistance of the upper and lower dies and the metal plate can be reduced, and the upper and lower dies can be worn for 3 to 5 times as long as the conventional case. There is an advantage that the mold and the lower mold can be used, and the maintenance and management cost of the metal plate bending apparatus can be reduced to 1/2 to 1/5 as compared with the conventional case.

Further, according to the present invention, a high-hardness alloy layer is formed on the pressing portion of the upper die and the bending groove of the lower die and the shoulder thereof, and the smooth surface of the pressing portion of the upper die and the bending groove of the lower die are formed. This makes it possible to prevent the occurrence of scratches on the surface of the metal plate caused by the upper and lower dies when the metal plate is bent, and to bend the metal plate neatly.

Further, according to the present invention, a flexible film such as a polyester film is formed on the side surface and the bottom surface of the upper die and the lower die, and is pressed by the upper die due to a failure or erroneous operation of the metal plate bending device. The bent portion of the metal plate collides with the lower groove of the lower mold, and the upper and lower molds are cracked or damaged by bonding and holding the cracked or damaged upper and lower mold grooves and side surfaces. It has the advantage of being able to easily prevent parts from scattering around, at low cost, and has the advantage of maintaining occupational safety.Furthermore, the company name, brand name and catchphrase are described on the flexible membrane, and various decorations are applied. There is also a merit that can be used as an advertising medium.

[0025]

[Brief description of the drawings]

FIG. 1 is a development view of a metal sheet bending apparatus according to the present invention, which includes an upper mold having a high hardness alloy layer formed thereon and a lower mold having a high hardness alloy layer formed thereon.

FIG. 2 is an illustration of a metal sheet bending apparatus of the present invention showing a state in which a metal plate is bent by pressing a metal plate against a bending groove of a lower die having a high hardness alloy layer formed thereon by an upper die having a high hardness alloy layer formed thereon. FIG.

FIG. 3 is a side view of the metal plate bending apparatus of the present invention in which a polyester film is formed on the side surface and the bottom surface of the upper mold having the high hardness alloy layer formed thereon and the lower mold having the high hardness alloy layer formed thereon.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper mold 2 Lower mold 3 Bending groove 4 Metal plate 5 High hardness alloy layer 6 Side surface 7 Shoulder part 8 Pressing part 9 Polyester film 10 Bottom

Claims (2)

[Claims] 1. A metal plate bending device for bending a metal plate placed on a lower die provided with a bending groove by pressing the metal plate into a lower bending groove by an upper die. An apparatus for bending a metal plate having a shoulder portion formed with a high-hardness alloy layer coated by a discharge surface treatment or a silicon carbide plating treatment. 2. The metal sheet bending apparatus according to claim 1, wherein a flexible film such as a polyester film, a vinyl film, a fiber film, a metal film, and a metal deposition film is formed on the side surface and the bottom surface of the upper die and the lower die. .