JP2003311330A - Method and device for bending metallic sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for performing the bending/forming of a steel sheet on the surface of which painting or the like is applied and on which a protective film is adhered into an approximately C-shaped cross section without scratching the surface and breaking the protective film. <P>SOLUTION: The upper die of the device is provided with a cam die 10, core dies 11, 12 the width of which is made variable by their cam mechanisms and bender guides 13, 14 for guiding the circular motion of benders 21, 22 on both sides of the core die. The lower die of the device is provided with a pad 20 having a positioning pin 20b for holding a work between itself and the core dies of the upper die of the device on its upside, benders for bending a metallic sheet along the shape of the core die by performing a circular motion freely rotatably, bender receivers 23, 24 which have supporting parts for rotating the benders on both sides of the pad and with which the benders are pressed against the core dies, holders 25, 26 for holding the position in the original positions of the benders and backup blocks 27, 28 for backing up to loads added to the holders and the bender receivers when working the work. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for processing a metal plate by bending it twice or more to form a substantially C-shaped cross section. In particular, in the case of a printed steel plate, for example, a printed steel plate whose surface is coated with a metal plate, it is required that the scratches and peeling of the coated surface be bent without peeling off the protective film attached to the base. The present invention relates to a bending method and an apparatus therefor.

[0002]

2. Description of the Related Art As a conventional technique, as shown in FIG. 4A, a bending machine uses a bending die 1 and a bending die 2 to first bend both ends of a plate P one by one, and then bend the die 3. The bending die 4 is used to bend the inside again one by one to form the plate material into a substantially C shape. Another example is a conventional molding method using a press die, and as shown in FIG. 4B, as a first step, the plate material P is sandwiched between the die 1 and the pad 2a, and the inside of the die 2 is held. Form both ends of the plate material. Next, as a second step, the plate material P is sandwiched between the mold 3 and the pad 4a, and a second bending process is performed by the mold 4 to form a substantially C shape.

[0003]

In the former case of FIG. 4A by the above-mentioned processing method, the protective film is not peeled off and the damage is slight, but the number of processing steps is large and inefficient. Moreover, there is concern that the dimensional accuracy may vary, which is not suitable for mass production. In the latter case of FIG. 4 (b), the protective film is peeled off because the so-called handle is applied at the corners of the mold because the mold is drawn into the mold and molded, and the coating film is also damaged. Also, it is extremely inconvenient because the plate material formed after bending must be pulled out in the longitudinal direction unless a special mechanism is taken to remove it from the mold 3, and the workability is extremely poor because it damages or distorts the product. .

The object of the present invention is to solve the above-mentioned problems of the prior art. First, it is possible to perform bending without damage to the coated surface of the plate material and peeling of the protective film, and to perform bending twice in one step. It is an object of the present invention to provide a method for bending a metal plate capable of forming a substantially C-shape and achieving high productivity and improvement in processing accuracy, and a bending apparatus used for the method.

[0005]

In order to achieve the above object,
The present invention has the following configurations.

According to a first aspect of the present invention, a cam die fixed to the upper die and a cam die suspended from the cam die are slid in the width direction when the cam portion of the cam die is inserted and removed by lifting and lowering the upper die. In the pair of core molds to be opened and closed, the cam part is fitted by lowering the upper mold, and the lower surface of the core mold in a state of being opened in a predetermined bending shape, and the lower mold,
The plate material is sandwiched between the upper surface of the pad that is urged by a spring so that it can slide up and down, and the upper mold is lowered to push down the pad, thereby removing the pad from both sides of the pad. One end is pushed down at both ends in the width direction of the plate material not sandwiched. As a result, the bender rotates about the corner of the bender receiver that is located in the lower part and fixed to the lower die as a fulcrum, and moves circularly with the corner of the one end as the center of the circle and the R part of the other end as the radius. do. The R part at the other end of the bender is located on both sides of the cam mold and installed in the upper mold. The R part has a radius equal to the circular motion of the bender. do. As a result, the bending part of the bender is made into a plurality of bending processes sequentially from both sides of the core-shaped bending part along the shape of the bending part so that both ends of the plate material that are not sandwiched are wound. Mold into a C shape. After processing, the core die released from the spring pressure of the pad by the rise of the upper die is pushed down by the knockout pin, the core die is separated from the cam part, the width is closed by the tension spring, and the bent plate material Is characterized by being automatically detached from the core type.

In such a construction, in the first bending, the point where the one corner of the core type and the one corner of the bender are in contact with each other becomes the center point of the circle, and the radius of the sliding surface and the radius of the R surface of the bender guide are set. Since the R portion at the other end of the same bender makes a circular motion to bend the plate material, this is a bending method in which handling friction between the plate material and the bending die does not occur. Therefore, the coated surface of the plate material is not damaged and the protective film is not peeled off. Subsequent bending will be push bending between the other corner of the core type and the other corner of the bender, so theoretically some handling will occur, but there will be no damage on the painted surface and there will be imprints on the protective film. Does not peel off.

According to the second aspect of the present invention, the cam die is fixed to the upper die base, and a pair of core die is suspended by a link at each longitudinal end face with the cam portion at the tip of the cam die sandwiched. To wear. The pair of suspended core dies are slidable in the width direction when the upper die moves up and down and the cam portions are inserted and removed, so that they can be opened and closed. To keep the pair of core molds in a normally closed state, a spring-biased knockout pin for removing the cam part from the core mold is provided on the cam mold, and a tension spring for pulling each other is stretched on the pair of core molds. To do. A pair of bender guides, which are in close contact with both sides of the cam die and have R-side sliding portions and are symmetrically arranged so as to face each other inwardly, are fixed to the upper die base. The upper mold having the above functions and the pad having the plate positioning pins on the upper surface and biased by the spring to be slidable up and down are mounted on the lower mold base. On both sides of the pad, a pair of benders, which are symmetrically arranged with their bent portions facing each other, are slidably installed. The bender is located on a pair of bender receivers that have corners that serve as fulcrums for rotation and are arranged symmetrically with respect to each other and fixed to a lower die base. Set up. The pair of benders are rotatably provided with one corner of the bender receiver as a fulcrum. Further, a pair of holders which are located on both sides of the pair of benders and the vendor receivers and which are attached to the lower die base by a spring and are slidable up and down in order to hold the rotation of the benders and the outside of the holders. Then, a pair of backup blocks for holding the sliding of the holder are fixed to the lower mold base. The metal plate bending apparatus for realizing the metal plate bending method according to claim 1, wherein the metal plate bending apparatus is configured with a lower mold having the above functions.

The bending apparatus having the above structure is mounted on a press machine or the like, and the upper die is lowered to press the upper die core die downward against the upper surface of the lower die pad on which the plate material is set to perform bending work. By further lowering while sandwiching the plate material of the portion which is not held and inserting the cam portion of the cam die into the core die, the core die is pushed open in the width direction to a predetermined bending dimension. Further, the upper die descends and continues to push down one end of each of the pair of lower die benders at the bending angle of the core die through the plate material. The bender is forcibly rotated with one corner of the pair of bender supports as a fulcrum, and one of the corners pressed is the center point of the circle, and the R of the other end is R.
With the surface as a circle radius, circular movements in opposite directions are made along the R-shaped sliding part of the bender guide with the same radius, and at the end, it slides into the inside of a pair of bender receivers from both sides and a core-type bending part The plate material is turned so as to be wound around and the both ends of the plate material are sequentially bent in one step to form a cross section having a substantially C shape. At the bottom dead center of the upper die, the lower die pad bottoms out, and at the same time, the bender moves the core with the pushing force from above by the sliding part of the R surface of the bender guide and the pressure from both sides via the bender receiver. The plate material is pressed against the mold, and the plate material is fixedly pressed and molded along the core mold over the entire surface.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a method for bending a metal plate and a suitable bending apparatus used for the method according to the embodiments of the present invention will be described in detail with reference to FIGS. To understand.

In this embodiment, as shown in FIG. 3 (a), the thickness is 1.2 mm, one surface is baked and coated, and the protective film F is adhered to the coated surface S1 and the other surface is plated. By using a printed steel plate having a surface S2 and bending the coated surface S1 outward, a door component for a home elevator as shown in FIG. 3B is manufactured. In this embodiment, as shown in the sectional view of FIG. 3 (c), the primary bending B1 and B1 and the secondary bending B2 and B2 are performed in one step, and the coating film is not damaged and the protective film is not peeled off. It is to be bent into.

As shown in FIGS. 1A and 1B, the upper mold 1 of the apparatus has a cam mold 10 fixed to an upper mold base 17,
A plurality of knockout pins 10b provided on the cam die 10 are formed by suspending a pair of core dies 11 and 12 on the end faces in the longitudinal direction so as to sandwich the cam portion 10a of the cam die 10 with links 15 and 16. Push down the core dies 11 and 12.
The tension spring 30 is passed over and stretched over the core molds 11 and 12 to normally close the core molds 11 and 12 in the width direction. Further, the bender guides 13 and 14 for guiding the circular movements of the benders 21 and 22 described below are arranged on both sides of the cam die 10 to thereby form the upper die base 1.
Stick to 7. On the other hand, in the lower mold of the apparatus, the pad 20 is slidably fitted on the lower mold base 29 by a plurality of guide posts 20a, and is biased by a spring 31 so as to be slidable up and down. Two positioning pins 20b of the work P made of a steel plate are provided at both ends of the upper surface of the pad 20 by spring biasing.
When the pad 20 descends, a pair of bender receivers 23 and 24 are symmetrically arranged at positions where they slide on both sides and are fixed to the lower mold base 29. A pair of benders 21 and 22 located on both sides of the pad 20 and symmetrically arranged on both sides of the pad 20 by sliding one end thereof into bender receivers 23 and 24
Are mounted on the upper surface of each of the springs, and the springs 33 stretch and engage the bender receivers 23 and 24, respectively. As a result, the vendors 21 and 22 receive the vendors 23 and 23 during processing.
When the support portions 23a and 24a of 24 are rotated about the fulcrum,
In the circular motion, the corners 21a and 22a at one end are used as the center points of the circle, and the R portions 21b and 22b at the other end are used as radii.
It is designed to return to the top and be placed horizontally. In order to hold the movement of the benders 21 and 22 at the start of the circular movement, the holders 25 and 26 are provided with a plurality of guide posts 25.
It is slidably attached to the lower die base 29 by a.26a and urged by a spring 32 so as to be slidable up and down. Backups 27, 28 are fixed to the lower mold base to hold the slides of the holders 25, 26 and to prevent escape by a load applied to the bender receivers 23, 24 when bending the work by the benders 21, 22.

As shown in FIGS. 1A and 1B, the upper mold 1 and the lower mold 2 of the apparatus having the above-described structure are mounted on the slide surface 50 and the bolster 51 of the press machine, and the apparatus shown in FIG. (A)
Peripheral shape processing shown in and the punched holes H1 at both ends in the longitudinal direction.
Work P made of flat steel plate with the cut window H2 processed
With the painted surface S1 facing down, the two holes of the processed punched hole H1 and the inner ends of the punched hole H2 are used as position references.
(A) and (b), the hole H1 and the window H2 are fitted into the positioning pin 20b provided on the upper surface of the pad 20 of the lower mold 2 of the apparatus, and the work P is placed on the surface of the pad 20. Regulate and set.

Next, the steps of lowering the slide surface of the press machine and bending the work P of the steel plate by the bending apparatus will be described with reference to FIGS. 2 (a) to 2 (e) and FIG. 3 (a). This will be described with reference to (c). (The press machine is not shown)

FIG. 2A is a diagram in which the sliding surface of the press is at the top dead center, and the work P is fitted with the hole H1 and the hole H2 in the positioning pin 20b with the painted surface S1 facing downward. It is in a state of being set on the surface of the pad 20 of the lower mold 2 of the shining device. The cam portion 1 of the cam die 10 of the upper die 1 of the apparatus
0a is removed from the core molds 11 and 12, and the core molds 11 and 12 are closed in width.

In FIG. 2B, the slide surface of the press starts to descend, the lower surfaces of the core dies 11 and 12 first come into contact with the work P on the surface of the pad 20, and the slide surface further descends to move the cam portion. FIG. 10 is a view showing a state in which 10 a is fitted into the core dies 11 and 12 to push the core dies to open them to a predetermined die width, and the cam die 10 presses the core dies 11 and 12 to clamp the work P with the pad 20.

FIG. 2 (c) is a view in the middle of processing in which the slide surface of the press is further descending. As described above, the core molds 11 and 12 push down the pad 20 while holding the work P, Both ends in the width direction of the work P that are not sandwiched by the corners 21a.22 of the benders 21.22.
Push down a and the vendors 21 and 22 will receive the vendor 23.
The support portions 23a, 24a of 24 are forcibly rotated about a fulcrum, and at the same time, the corners 21a, 22a of the bender are used as the center points of the circles, and the R portions 21b, 22b at the other end are used as radii for circular movement. This circular motion is equivalent to the radius R of the circle with the same radius as above.
The bender guides 13 and 14 provided with the sliding surfaces move circularly by being guided by the sliding portions 13a and 14a of the R surface. Due to the circular movement of the benders 21 and 22, both ends of the work P that are not sandwiched are bent at the bending angle 11a.
2a can be bent along a folding line. FIG. 2 (c) is an intermediate step of the bending process, in which the primary bending is almost completed and the benders 21 and 22 are just slipping into the bender receivers 23 and 24, and also immediately before the secondary bending.

FIG. 2 (d) is a view showing the sliding surface of the press machine down to the bottom dead center. The benders 21 and 22 slide inside the bender receivers 23 and 24, and the bender 2
The secondary bending parts 21c and 22c of 1.22 are core type 11 and 12.
Is pressed into the secondary bending angles 11b and 12b and sliding portions 13a and 14a on the R surface of the bender guides 13 and 14
Presses the R portions 21b and 22b at the other end of the benders 21 and 22 and the R portions 23b and 24b of the vendor receivers 23 and 24 to obtain the reinforcement of the backup blocks 27 and 28, and to bend the benders 21 and 22 from both sides.・ The force that pushes into 12 works to perform the secondary bending of the work P and the pad 2
0 bottoms on the lower die base, and flatness processing of the work P is simultaneously performed by the lower surfaces of the core dies 11 and 12 and the upper surface of the pad 20, and the entire bending surface is determined and pressed.

FIG. 2E shows a state in which the processing is completed, the slide surface of the press is raised, the core dies 11 and 12 are width-closed, the work P is separated, and the benders 21 and 22 are returned to their original positions. It is a figure. When the slide surface of the press starts to rise from the bottom dead center, the pressure of the spring 31 of the pad 20 of the lower die 2 of the apparatus is stronger than the spring pressure of the knockout pin 10b of the upper die 1 of the apparatus, so that the upper die 1 cams. With the portion 10a fitted in the core molds 11 and 12, the benders 21 and 22 are also connected to the core molds 11 and 12.
While being fitted to 2, it rises together with the pad 20. When the upper die 1 of the device further rises and the pad 20 reaches the original position, the spring pressure of the pad 20 is released, and the knockout pin 10b and the core die 11.
The cam portion 10b comes off from the core 12, and the core molds 11 and 12 are the spring 3
At 0, the width of the inquiry work P is closed so that it can be separated. Since the work P is fitted to the positioning pin 20b and is not displaced in the horizontal direction, the work P is reliably separated from the core die and remains on the pad 20, so that the work can be easily taken out without being deformed or damaged. On the other hand, when the benders 21 and 22 that have risen while being fitted in the core molds 11 and 12 come out of the bender receivers 23 and 24, they are pulled by the spring 30 and inverted, and placed horizontally on the bender receivers 23 and 24. Then, it is set inside the holders 25 and 26 and returns to the original position.

[0020]

EFFECTS OF THE INVENTION According to the present invention as described above, the so-called handling that occurs during bending forming of a steel sheet can be almost eliminated, and it is possible to bend a steel sheet whose surface is coated or coated with other decorative film. Therefore, not damaging them can improve the quality because the protective film attached to the processed surface can be processed without tearing or peeling from the base.

Further, the steel sheet is bent twice in the same direction and C
Since it can be processed in one step even when forming into a shape, compared to the conventional method that requires multiple steps, not only the processing time is shortened, but also the distribution cost between steps is included and the long work piece is difficult to handle. Even so, the workability of taking out is good, and extremely high productivity can be realized.

[0022]

[Brief description of drawings]

FIG. 1 is a device of the present invention, in which (a) is a side view and a schematic configuration diagram including a partial cross-sectional view, and (b) is a schematic configuration diagram of a front view.

FIG. 2 is a side view showing a bending process using the apparatus of the present invention and a schematic process drawing including a partial cross-sectional view,
(A) is a diagram in which a work is set, (b) is a diagram immediately before the start of bending with a cam fitted therein, (c) is a diagram showing the movement of the bender during the process of primary bending, d)
6B is a diagram in which the bending process is completed, and FIG. 7E is a diagram in a state where the device is returned from the core mold and returned to the initial position.

3A and 3B are a perspective view and a sectional view of a work used in the embodiment of the present invention, in which FIG. 3A is a plate material before bending, and FIG. 3B is a door component of a home elevator after bending. And (c) is a cross-sectional view of a work bent into a C-shape.

4A and 4B are schematic cross-sectional views showing a conventional bending method, wherein FIG. 4A is a bending method using a bending machine, and FIG. 4B is a forming method using a mold. .

[Explanation of symbols]

1 Upper mold of device Lower mold of 2 devices 10 cam type 10a cam part 10b Knockout pins (plural) 11,12 core type 11a, 12a Primary bending angle 11b, 12b Secondary bending angle 13,14 Vendor guide 13a, 14a R surface sliding part 15,16 links 17 Upper mold base 20 pads 20a Guide post (plural) 20b Positioning pin (plural) 21,22 vendors 21a, 22a corners 21b, 22b R part at the other end 21c, 22c Secondary bending part 23,24 Vendor receiving 23a, 24a Supporting part 25,26 holder 25a, 26a Guide posts (plural) 27,28 Backup block 29 Lower mold base 30 springs (plural) 31 springs (plural) 32 springs (plural) 50 Slide surface of press machine 51 Bolster surface of press machine B1 primary bending part B2 Secondary bending part F protective film H1 Work hole H2 work removal window P work S1 Work coated surface S2 Work plating surface

Claims (2)

[Claims] 1. A cam die fixed to the upper die of the apparatus, so that the cam width of the cam die can be opened and closed so that the die width can be freely opened and closed. A pair of core dies thus prepared are suspended by a link, and a plate member set on the upper surface of a pad which is urged by a spring to a lower mold by a lowering of the upper mold and slidable up and down is installed in the core mold. At the same time as sandwiching on the lower surface, the cam is inserted into the core die to open the core die, and the upper die descends to push down the pad, and one end of each of the pair of benders slid on both sides of the pad is sandwiched between the plate materials. By pressing down on both ends of the bender, the bender is fixed to the lower mold base of the device, and the corners of the bender receiver provided in contact with the lower surface of the bender serve as the fulcrum, and the bender guide R surface fixed to both sides of the cam mold. Along the sliding part of the While rotating so as to insert, the both ends of the non-sandwiched plate material are sequentially bent at least once in one step along the core-shaped bending shape to form a substantially C-shaped cross section. After processing, the core plate is released from the cam part by pressing the knockout pin and the core die's own weight, the width is closed by a spring, and the bent plate material is automatically separated from the core plate. Bending method. 2. A cam die is fixed to an upper die base of the apparatus, and the cam portion at the tip of the cam die is clamped from both sides, and the cam die is suspended by both end faces in the longitudinal direction by a link. , A pair of core dies that are slidable in the width direction by opening and closing of the cam portion so as to be openable and closable, and a knockout pin provided on the cam die for detaching the core die from the cam portion, and a core die A pair of bender guides in which the core die is mounted so that the core die is always closed with a spring provided on the core die so as to attract each other, and R-side sliding portions are provided, and the R-faces face each other inwardly. The upper die, which is fixed to both sides of the cam die, and the lower die base of the device, which is slidably engaged with a plurality of guide posts, is urged by springs, and is vertically slidable. A positioning pin for the plate of the work is provided to check the sliding position of the pad. A pair of bender receivers slidably installed on both sides and arranged symmetrically to each other and fixed to a lower die base, and a pair of bender holders rotatably mounted on the bender receivers and stretched by tension springs with the bender receivers. In order to hold the initial rotation of the bender by making sliding contact with the R surface at one end of the bender, and by sliding with a plurality of guide posts on the lower die base of the device and urging with a spring to slide up and down. A pair of holders movably mounted on the lower mold base, and a pair of backup blocks for holding the sliding and for reinforcing the lower mold when molding the plate material are fixed to the lower mold base. The metal plate bending apparatus for use in the metal plate bending method according to claim 1, wherein the metal plate bending apparatus comprises a lower die.