JP4550246B2 - Upper mold length conversion device for folding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for freely converting a mold length according to a bending length of a plate material in bending processing of a metal plate material by a folding machine, a bending machine, a press brake or the like.
[0002]
[Prior art]
In general, cabinets, vending machines, refrigerators, refrigerators, unit baths, sinks, office machines, and the like often use panels that are obtained by bending a substantially rectangular metal plate. This panel is made by folding a metal plate (hereinafter referred to as a workpiece) that has been cut into a shape having side edges that are bent in four sides in advance using a folding machine such as a folding machine, bending machine, or press brake. It is formed by bending.
[0003]
The bending of each side edge of the four sides of the work is performed by bending the short side edge and then rotating the work on a plane so that a clamp upper die matched to a predetermined length is formed on both the short sides. The long side edge is bent so as to have a predetermined folding width inside the fold. When the side edges of both short sides are bent first, both ends of the long side of the workpiece are raised, and the clamp upper mold that bends the long side edge is the workpiece of both the raised short sides. The length must be reduced by reducing the plate thickness. Therefore, it is necessary to adjust the length of the clamp upper die for each workpiece thickness, cutting size, etc., and actually prepare the clamp upper die according to the processing dimensions etc. and replace it manually. It was.
[0004]
Also, recently, a conversion device that makes the length of the upper clamp mold variable is used. JP-A-61-219426 and JP-B-63-59767 disclose that a necessary number of divided upper molds having a predetermined width are arranged side by side, and a thinly divided upper mold is divided into spline shafts, Alternatively, it can be mounted on a rotary shaft provided with a selection key, and a thin upper die is rotated by a required number together with these shafts and moved downward, and the upper die is set to a predetermined length by arranging with the divided upper die. The rotating shaft on which the thin upper mold disclosed in Japanese Patent Publication No. 4-68048 is rotated, and the thin upper mold is configured to be an upper mold of a predetermined length by facing downward by the required number of sheets, There is an invention in which the upper die is moved so that the bending center and the upper die center are aligned and in contact with the workpiece. In any of these inventions, since the thin upper mold is mounted on the rotating shaft and the thin upper mold is rotated together with this, the size of the mold is limited to ensure the rotation space. Since it is still located above, depending on the height of the side of the workpiece that has been bent first, it may become an obstacle to subsequent bending.
[0005]
[Problems to be solved by the invention]
The length of the upper die can be changed without having to change the upper die of the folding machine every time the size of the workpiece to be bent changes, In addition, the present invention provides an upper mold length conversion device for a folding machine that enables subsequent folding processing regardless of the height of the side that has been folded first.
[0006]
[Means for Solving the Problems]
The invention according to claim 1 is an upper mold length conversion device for a bending machine that performs bending by changing an upper mold length according to a workpiece length, and is mounted in a holding member of the folding machine. The upper mold is composed of a plurality of division molds and a selection mold made of a thin plate material obtained by further dividing the division mold, and the division mold and the selection mold are slidably and detachably held in the holding member. And a lifting means for moving the selection mold that has become redundant in response to a change in the length of the upper mold from the holding means and then moving the selected mold to a higher retreat position of the holding member. It is a feature.
[0007]
The invention according to claim 2 relates to the invention according to claim 1, wherein the holding means holds the upper ends of the divided type and the selective type.
[0008]
The invention according to claim 3 relates to the invention according to claim 1, wherein the elevating means comprises a swing holder for storing the selection mold and elevating drive means for elevating the swing holder. is there.
[0009]
According to a fourth aspect of the present invention, in the upper mold length converting device for bending the bending machine by changing the upper mold length according to the work length, the folding machine is mounted in the holding member of the folding machine. The upper mold is composed of a plurality of division molds and a selection mold made of a thin plate material obtained by further dividing the division mold, and the division mold and the selection mold are slidably and detachably held in the holding member. The selection mold and the separation remaining after the selection mold that has become redundant in response to the change in the length of the upper mold is slid along the holding means and separated from the retention means. A pressing means for pressing the mold in a predetermined direction and holding it in the holding member is provided .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to an upper mold length conversion device capable of changing the length of a clamp upper mold (hereinafter referred to as an upper mold) to a predetermined length, which is provided in a bending machine for bending a workpiece. Here, although the illustrated folding machine is a Kokibender, it can also be applied to a folding machine, a press brake, and the like.
[0011]
FIG. 1 is a schematic diagram illustrating a configuration of a bending machine 1 (kokibender) according to the present embodiment when a processing unit that performs workpiece bending is viewed from the side. The upper mold holding part 2 that holds the upper mold attached to the lower end of the ram 3 that is linearly driven up and down by driving means (not shown) includes slide gibs 7a and 7b that hold the upper mold 13 on the bottom surface thereof, And a restraining portion 2a for restricting the lowering of the ram 3 and restraining it at a predetermined height. The slide gibs 7a and 7b are attached in the vicinity of the rear end of the upper mold holding part 2, and the slide gib 7a and the slide gib 7b are members constituting holding means having L-shaped longitudinal sections, respectively. The upper mold 13 is slidably held. Moreover, the upper mold | type 13 can be easily attached or detached from the edge part of slide give 7a, 7b. In a space provided between the slide give 7a and the slide give 7b above the upper mold 13, a selection unit 24 used when changing the length of the upper mold 13 is attached to the guide rail 25, and the upper mold 13 It is configured to be slidable in the longitudinal direction. The guide rail 25 and the like are provided in the upper mold holding unit 2 together with a driving unit that moves a selection unit 24 (not shown).
[0012]
The upper mold holding part 2 has a substantially U-shaped vertical section with both sides projecting downward, and a restraining part 2a is provided on one projecting side projecting largely in a columnar shape, and almost projects. The slide gibs 7a and 7b are attached to the bottom surface of the other side. A protrusion is provided on the bottom surface of the restraining portion 2a and comes into contact with an upper surface of the lock block 6 having a substantially H-shaped longitudinal section (the substantially H-shaped upper surface recess), and the ram 3 is lowered. Stop. A recess provided in the bottom surface of the lock block 6 (the substantially H-shaped bottom recess) is fitted into a locking member 8 attached to the top surface of the base 5 and fixed to the folding machine 1. The lowest position of the ram 3 when the workpiece 12 is clamped is adjusted by the height of the lock block 6.
[0013]
Further, the lower mold 14 is firmly held on the upper surface of the base 4 so as not to move even when the ram 3 is lowered. The foot mold 10 is attached to the upper end of the drive holder 11 and is provided between the pedestal 4 and the pedestal 5 and is moved up and down together with the drive holder 11 by a drive means (not shown). Further, a cam 9 is attached to the inner wall surface at the upper end of the pedestal 5 so as to protrude from the inner wall surface, and ascending the foot mold 10 is restricted by contacting the foot mold 10.
[0014]
The swing holder 20 attached to the upper mold holder 2 or the casing of the folding machine 1 above the upper mold holder 2 accommodates an extra selection mold described later, and moves the selection mold to be detached from the upper mold holder 2. It is driven in the vertical direction (or diagonally up and down direction) by a lift drive means (lift cylinder 34 shown in FIG. 3) not shown here.
[0015]
In bending the work 12, first, the foot mold 10 is positioned below the lower mold 14, and the ram 3 is lowered to clamp (clamp) the work 12 between the upper mold 13 and the lower mold 14. . At this time, the edge 12a of the work 12 to be bent is protruded from the bottom of the upper mold 13 and the edge of the lower mold 14. The body 10 is raised from below the workpiece 12 to a position A, and the edge portion 12a is bent upward.
[0016]
FIG. 2 is a side view showing a side shape of the selection mold 15 constituting the upper mold 13. The selection die 15 is made of a thin plate material such as a plurality of metals, and its side surface has a substantially rectangular shape, and an engaging portion 15a protruding in a substantially T shape is integrally formed at the upper end portion thereof. Further, when a plurality of thin upper molds are brought into close contact with each other, there is provided a substantially rectangular protruding portion with a long side horizontal, which protrudes to the rear of the selection mold 15 in the vicinity of the upper end of the rear side 15d which is the back surface of the selection mold 15. In the vicinity of the edge of the protrusion, recesses 15e and 15f are provided on both upper and lower sides to form an engagement portion 15g. The front side 15h is formed so as to spread below the selection die 15 so that a corner portion 15k formed between the front side 15h and the bottom side portion 15i is slightly sharper than a right angle. The selection die 15 (upper die 13) is exemplified by a corner portion 15k having a slightly sharper angle than a right angle, but the angle of the corner portion 15k is changed depending on the bending R (folded shape) of the workpiece.
[0017]
The engaging portion 15a constitutes a holding means between the upper die holding portion 2 and the shape thereof is provided with a concave portion 15b opened to the rear of the selection die 15 and a concave portion 15c opened to the front. It is formed in a T shape. The engaging portion 15a is engaged between the slide gibs 7a and 7b attached to the bottom surface of the upper mold holding portion 2, and this is because the concave portion 15b is fitted to the tip of the bottom side of the slide gib 7a (L-shaped). Similarly, the recess 15c is fitted to the tip of the bottom side of the slide give 7b. The selection die 15 held by engaging with the slide gibs 7a and 7b as described above can slide in the extending direction of the slide gibs 7a and 7b while being held so as not to fall from the upper die holding portion 2.
[0018]
Although the shape of the selection mold 15 has been described here, the divided molds 16a, 16b, 16c, 16d, 16e, 16f, 16g, 16h, 16i, 16j, 16k, and 16l constituting the upper mold 13 shown in FIG. This is the same for the side surface shape of 16 m. Or the shape which abbreviate | omitted the engaging part 15g provided in the back piece 15d of the selection type | mold 15 may be sufficient. Each division type has a shape in which a plurality of selection types are arranged in close contact with each other, and conversely, the selection type of one thin plate member is obtained by further dividing the division type.
[0019]
FIG. 3 is a schematic diagram illustrating a configuration of an upper mold length conversion device provided in the folding machine 1 when the folding machine 1 is viewed from the front. The upper mold 13 is held by slide gibs 7a and 7b extending in the horizontal direction (not shown). The upper mold 13 has a selection mold 15 in which a plurality of thin upper molds are brought into close contact with the left end, and on the right side of the selection mold 15 are divided molds 16a, 16b, 16c, 16d, 16e, 16f, 16g, in order. 16h, 16i, 16j, 16k, 16l, 16m and 13 divided types are arranged side by side. In addition, on the upper surface of each of these split molds, select concave molds 21a, 21b, 21c, 21d, 21e, 21f, 21g, 21h, which are used for selecting the split molds to be used and holding them so as not to move, 21i, 21j, 21k, 21l, and 21m are provided, respectively.
[0020]
The selection unit 24 for selecting the split mold used for the bending process is held so that the protrusion or recess provided on the upper surface thereof is engaged with the guide rail 25 so as not to fall, and along the guide rail 25 It moves horizontally above the upper mold 13. A cylinder 23 driven by compressed air or the like is provided at the lower end of the selection unit 24, and the selection claw 22 attached to the piston rod of the cylinder 23 is moved up and down. The selection claw 22 is formed in a size and shape that engages with a selection recess formed on the upper surface of each split mold, and the split mold is moved along the slide gibs 7a and 7b in a state of being engaged with the selection recess. Has strength and rigidity to slide.
[0021]
A through hole provided with screwing means is provided in the central portion of the selection portion 24 in parallel with the extending direction of the guide rail 25, and a screw shaft 30 having a thread is formed in the through hole. Screwed and penetrated. The screw shaft 30 is pivotally supported by the upper mold holding part 2 so as not to move by rotation, and a detection means 31 for detecting the number of rotations of the shaft is attached to one end, and the detected number of rotations is not shown in the figure. The movement distance of the selection unit 24 and the stopped position (coordinates, etc.) are detected by being replaced with an electric signal, and are input to a control means (not shown). A pulley 29 is attached to the other end of the screw shaft 30, and the rotational driving force of the motor 26 is transmitted via the pulley 27 attached to the drive shaft of the motor 26 and the drive belt 28. Rotate. The motor 26 can rotate in both the left and right directions, and the rotation direction and the number of rotations are controlled by the control means. By controlling the operation of the motor 26 in this way, the moving distance, the stopping position, and the like of the selection unit 24 are controlled by the control unit.
[0022]
The cylinder 32 serves as pressing means to press and move the selection mold 15 and the divided molds held from above by the slide gibs 7a and 7b in the right direction . Similarly, cylinder 33 Ru also move selected type 15, and the divided-type pawl and presses the left direction as a pressing means. Any they cylinders 32 and 33 also driven by compressed air or the like, the cylinder 32 on the left side of the upper mold 13, the cylinder 33 that is disposed on the right side of the upper die 13.
[0023]
The swing holder 20 used when holding the surplus selection mold not used for the bending process and detaching the selection mold from the upper mold holding portion 2 is attached to the piston rod of the elevating cylinder 34 driven by compressed air or the like. It is attached and moved up and down by driving the elevating cylinder 34, and when moved downward, to the side of the left edge of the upper mold 13 and when moved upward, the swing holder 20 The movable range is a range up to a retreat position (above the upper mold holding portion 2) where the selection mold held in the position does not become an obstacle to workpiece bending.
[0024]
Next, the operation of changing the length of the upper mold 13 will be described with reference to FIGS. When the upper die 13 shown in FIG. 3 is changed from the longest state to a predetermined length, first, the motor 26 is driven to move the selection unit 24 to above the split die 16a, and compressed air or the like is supplied to the cylinder 23. Supply and lower the selection claw 22. If the selection claw 22 is engaged with the selection recess 21a of the split mold 16a, the control unit (not shown) recognizes the position as the origin. The control unit controls the movement distance and direction of each operation with this position as the origin. In this state, compressed air or the like is supplied to the cylinder 33, and the right side surface of the split mold 16m is pushed to move each split mold to the left. At this time, since the split mold 16 a and the selection claw 22 are engaged, the selection pressure 15 is not applied with the selection pressure of the cylinder 33.
[0025]
In order to bring the plurality of thin upper molds constituting the selection mold 15 into close contact, compressed air or the like is supplied to the cylinder 32 to extend the left end surface of the selection mold 15. Next, in order to change the upper die 13 to a predetermined length, in order to separate the excessively thin upper die from the selection die 15, the repressing pressure of the cylinder 32 is released (compressed air or the like is discharged and the cylinder 32 is discharged). The piston is moved to the left end), and compressed air or the like is supplied to the elevating cylinder 34 to lower the swing holder 20.
[0026]
As shown in the schematic diagram of FIG. 4 (for the sake of clarity, the schematic diagrams of FIGS. 4 and 5 omit the illustration of the slide gib 7b), the swing holder 20 is lowered to the vicinity of the back of the upper mold 13, After moving to a position close to the edge of the slide give 7a (side of the split mold 15), when the selection claw 22 is raised and disengaged from the split mold 16a, the cylinder 33 is moved through the all split mold. The soot pressure is transmitted to the selection mold 15, and the excessive thin upper mold 15 j constituting the selection mold 15 is pushed into the swing holder 20. Needless to say, the pressure of the cylinder 33 is adjusted according to the number of surplus thin upper molds 15j.
[0027]
On the front surface of the swing holder 20, an insertion groove 20 a that engages with an engaging portion 15 g formed on the back surface of the selection die 15 is formed in parallel with the upper die 13. The insertion groove 20 a has an opening in front of the swing holder 20 and penetrates both the left and right side surfaces of the swing holder 20. In the thin upper mold 15j held (stored) in the swing holder 20, the engaging portion 15g is inserted into the insertion groove 20a from the right side surface of the swing holder 20. The insertion groove 20 a is formed with a protrusion 20 b protruding downward at the upper edge of the opening in parallel with the upper mold 13, and a protrusion 20 d protruding upward from the bottom surface 20 c of the insertion groove 20 a is the longitudinal length of the upper mold 13. It is formed parallel to the direction. The concave portion 15e of the engaging portion 15g and the projection 20b, and the concave portion 15f and the projection 20d are respectively fitted, and the thin upper mold 15j accommodated in the swing holder 20 is held so as not to drop off.
[0028]
Further, a stop piece 20e for closing the left end of the insertion groove 20a is attached to the left side surface of the swing holder 20, and when the thin upper mold 15j is inserted into the insertion groove 20a, an excessive soot pressure, etc. Is added so that the thin upper mold 15j does not come off the insertion groove 20a. Therefore, the stop piece 20e does not need to close the entire left end of the insertion groove 20a, and is not limited as long as it has such a size and shape that it can be supported so that the thin upper mold 15j does not fall off. But you can.
[0029]
As shown in the schematic diagram of FIG. 5, the thin upper mold 15j accommodated in the swing holder 20 is driven to move up and down the upper mold holding section 2 and is then selected by driving the cylinder 32. The left side surface of the mold 15 is pressed and held so as not to fall off the edge of the slide give 7a.
[0030]
After the surplus thin upper mold 15j is placed in the swing holder 20 as described above, for example, as shown in the schematic view of FIG. 6, the selection unit 24 is moved to above the split mold 16f, and the selection claw 22 is moved. Lower and engage with the selection recess 21f of the split mold 16f. Compressed air or the like is discharged from the cylinder 33, and the soot pressure applied to the split mold is released. With the selection claw 22 engaged with the split mold 16f, the selector 24 is moved to the right, and the split molds 16g, 16h, 16i, 16j, 16k, 16l, and 16m that are not used for bending are moved to the right. Move. After moving each of the unused split molds to a position that does not hinder the bending process, the selection unit 24 is moved to the left, and the split mold 16f is moved to the original position (in contact with the right side of the split mold 16e). Let
[0031]
After this, the cylinder 32 applies a coercive pressure from the left side of the selection die 15 so as to close the gap from the selection die 15 to the split die 16f with which the selection claw 22 is engaged so as not to open. In this way, the upper mold 13 is changed to a length suitable for bending the workpiece 12.
[0032]
In the above description. After placing the unused thin upper mold 15j into the swing holder 20, it was immediately moved upward, but the selective mold 15 to be used and the divided molds 16a, 16b, 16c, 16d, 16e, 16f should be secured and brought into close contact with each other. However, the present invention is not limited to the operation order illustrated here, and any other operation process can be performed as long as the same effects can be obtained.
[0033]
As described above, the operation for converting the length of the upper mold 13 to be short has been described, but the conversion operation for increasing the length of the upper mold 13 can also be performed by reversing the steps described so far. For example, the repressing pressure of the cylinder 32 is released, the swing holder 20 is lowered, the thin upper mold 15j and the selection mold 15 are arranged in parallel, the left side surface of the thin upper mold 15i is pushed by the cylinder 32, and the required number of thin upper molds 15j is held by the slide gibs 7a and 7b. Further, for example, the selection part 24 is moved above the split mold 16i, the selection recess 21i and the selection claw 22 are engaged, and the selection part 24 is moved leftward to split the split molds 16g, 16h, 16i. The upper die 13 is lengthened by being brought into close contact with the right side of the die 16f. In this way, each of the divided molds and the selective molds are held in the upper mold holding unit 2 and can be slid to make the upper mold 13 have a predetermined length.
[0034]
As described above, each of the split molds and selection molds constituting the upper mold 13 is held by the upper mold holding section 2 slidably by holding means (slide gibs 7a, 7b, etc.) at the upper end thereof. The slide gibs 7a and 7b can be easily removed from the edge or attached or mounted. Therefore, it is possible to easily replace the split mold and the selective mold having a shape suitable for the finishing of the bending process.
[0035]
【The invention's effect】
According to the present invention, the upper mold that is provided below the ram of the bending machine and clamps the workpiece is constituted by a plurality of divided molds and a selection mold, and the divided molds by the holding means that can slide in the upper mold longitudinal direction, And since the upper surface of the selection mold is held, it can be converted to an upper mold length suitable for the dimensions of the workpiece, and there is no structure around the upper mold, so one side of the workpiece or two symmetrical sides are bent first. Even if it is bent, an untreated side can be bent without obstructing the side that is bent and raised.
[0036]
Since the holding means is configured to be slidable in the longitudinal direction of the upper mold, the split mold and the selective mold from the folding machine can be easily exchanged, and the split mold and the selective mold can be formed. By changing, the range of processing possible with the same folding machine can be expanded.
[0037]
In addition, when the upper mold is converted into a predetermined length, an excessive selection mold that is not used is stored in a swing holder, and is moved upward from the upper mold (upper mold holding member) so that a predetermined length is obtained. Since there are no obstacles to the bending process around the upper die converted to, the degree of freedom in setting the workpiece bending dimensions and the like is increased.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a folding machine according to an embodiment of the present invention.
FIG. 2 is a plan view showing a selective side surface shape of the folding machine shown in FIG. 1;
FIG. 3 is a schematic view showing an upper mold length conversion device of the folding machine of FIG. 1;
4 is a schematic view showing an upper mold length conversion apparatus in FIG. 3; FIG.
FIG. 5 is a schematic view showing an upper mold length conversion apparatus of FIG. 3;
6 is a schematic view showing an upper mold length conversion apparatus in FIG. 3; FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Folding machine 2 Upper mold | type holding | maintenance part 3 Ram 4, 5 Base 6 Lock block 7a, 7b Slide give 8 Locking member 9 Cam 10 Foot type 11 Drive holder 12 Work 13 Upper type 14 Lower type 15 Selection type 20 Swing holder 22 Selection claw 23, 32, 33 Cylinder 24 Selection section 25 Guide rail 26 Motor 27, 29 Pulley 28 Drive belt 30 Screw shaft 31 Detection means 34 Lifting cylinder

Claims (4)

In the upper die length conversion device of the bending machine that folds by changing the upper die length according to the workpiece length,
The upper mold mounted in the holding member of the bending machine is composed of a plurality of divided molds and a selective mold made of a thin plate material obtained by further dividing the divided molds,
In the holding member, there is provided holding means for holding the split mold and the selection mold slidably and detachably,
A folding machine comprising lifting / lowering means for separating the selection mold that has become redundant in response to a change in length of the upper mold from the holding means and then moving the selection mold to a higher retreat position of the holding member Upper mold length conversion device.   2. The upper mold length converting apparatus of the folding machine according to claim 1, wherein the holding means holds upper ends of the split mold and the selective mold.   2. The upper mold length converting apparatus according to claim 1, wherein the elevating means comprises a swing holder for storing the selection mold and elevating drive means for elevating and lowering the swing holder. In the upper die length conversion device of the bending machine that folds by changing the upper die length according to the workpiece length,
The upper mold mounted in the holding member of the bending machine is composed of a plurality of divided molds and a selective mold made of a thin plate material obtained by further dividing the divided molds,
In the holding member, there is provided holding means for holding the split mold and the selection mold slidably and detachably,
After the selection mold that has become redundant in response to the length change of the upper mold is slid along the holding means and separated from the holding means, the remaining selection mold and the separation mold are pressed in a predetermined direction. An upper mold length conversion device for a folding machine, further comprising pressing means for holding the holding member on the holding member .

Images