JPH08309438A - Bending press machine for sheet metal - Google Patents

Abstract

PURPOSE: To change a changing die during normal bending operation, and not to require moving of a long size die as a fixed die as to composition of the end assembly die used during dovetail bending of sheet metal and composition of the end assembly die used during semi-dovetail bending. CONSTITUTION: As to a composition of a width assembly die Pb, a die changing device E having a die changing base B lacking a lower die U a one end part is provided. Further, a press die P is of a fixed die 7 in which most are not moved and which lacks one end at the side of die changing base B, under this state, a changing die 8a and side dies 8b, 8b as principal and spare dies 9a, 9b, 9c... standed by close to the fixed die 7 at one side are arranged, a first spare 9a has both side projecting shaped claws.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet metal bending press machine of a type in which a sheet metal is clamped on a lower die by a pressing die and bent by a motion of a blade or the like.

[0002]

2. Description of the Related Art This type of sheet metal bending press is applied to, for example, a so-called C-shaped frame in which an upper frame is pivotally supported at a rear end of the lower frame so as to be vertically swingable. A lower die is attached to the upper part, and a pressing die is attached to the upper frame, and the sheet metal is bent along an inner nipping opening sandwiched between the lower die and the pressing die. Although the bending shape of the sheet metal is various, for example, a dovetail bending in which both ends are bent in two steps and inverted into a U shape may be taken (see the shape of the sheet metal W in FIG. 7). Then, when further bending the remaining one side from the dovetail-shaped shape, a metal mold having a protruding shape on both sides that can be inserted into the inner method between the both ends thereof (referred to as a width-assembly mold in this specification). Since it was necessary to knit, the pressing die consisted of a combination of a large number of dies including an exchangeable die with adjustable width (see FIG. 9).

FIG. 9 shows a combination state of a pressing die 54 in a conventional sheet metal bending press machine, in which a knitting of a width assembly die which is accommodated in a dovetail bending of a sheet metal is performed at a central portion of a lower die 53. It was made in position, and therefore the central part of the machine was equipped with a mold changer for this knitting. Regarding the knitting of the width assembly mold, the exchange mold 58 for narrow width adjustment and the side molds 60, 60 sandwiching it are mainly used, and a large number of spare molds 62, 62, ... • are arranged, and these correspond to the inner size of the dovetail bending of the sheet metal. Further, long metal molds 64, 64 that occupy most of the pressing metal mold 54 are arranged on both sides, and when the tip of the metal plate W that bends only on one side is bent (see FIGS. 4, 5, and 8). ), One of the side mold 60 and the spare mold 62 is an end, and the end assembly mold is knitted in which the toe 66 projects at the end.

[0004]

According to the conventional sheet metal bending press as described above, when the sheet metal is bent, the center portion is normally used at all times, and therefore the replacement die 58 at that position is used. This was inconvenient because the work of bending work had to be temporarily interrupted in order to replace. That is, in an operating state, the exchange die 58 at the pivotal point cannot be left idle during the bending process, and even if the exchange die is not used, it is clamped to the lower die during the bending process. Since the replacement is impossible, a special operation time for replacing the replacement mold is required, and the operation is substantially stopped during that time, which is a major cause of impairing work efficiency.

Another cause of impeding the work efficiency is that the knitting of the width-assembly dies and the knitting of the end-assembly dies are accompanied by the movement of the long dies 64 on both sides. That is,
When performing normal bending work, long molds 64 on both sides,
64 is moved to the center (state of Fig. 9), but in order to knit a width mold or an end mold which can be accommodated in the dovetail bending or one-side bending of the sheet metal, the long metal mold should be placed on both sides or one side. Mold 64, 64
Is evacuated (see arrow in FIG. 9), so time is taken for the round trip. Moreover, it requires power for that purpose, which is a problem in terms of energy saving.

The present invention has been made in view of the above circumstances.
The exchange dies can be exchanged even during the normal bending work, and the knitting of the width assembly mold that fits in the dovetail bending of the sheet metal and the knitting of the edge assembly mold that fits in the half dovetail bending Regarding the above, it is an object of the present invention to provide a sheet metal bending press machine in which movement of a long die (referred to as a fixed die in the present invention) is unnecessary.

[0007]

In order to achieve the above-mentioned object, the present invention is a form in which a sheet metal is clamped in a lower die by a pressing die to take a bending posture, and the pressing die has both ends. In a sheet metal bending press that can knit a width-assembled die that fits in a dovetail shape that is reversed inside, the die change is made by removing the lower die at one end By providing a base, it is equipped with a die changing device that is not related to the bending posture of the sheet metal.Furthermore, most of the pressing dies are straight or series fixed dies that do not need to move. For narrow width adjustment so that the mold is cut off at one end on the mold exchange base side, and there can be knitted a width-combination mold with protruding toes on both sides that fits in the dovetail-shaped shape of the sheet metal as described above. The replacement mold and the side molds on both sides of One side is lined up with a spare mold for large adjustments that makes it stand by by moving to a fixed mold, and in addition, the mold changer has replacement molds and double-sided molds on top of the lower mold and the mold replacement base. It is characterized in that a moving part is provided so as to reciprocate between and, and the leading preliminary mold is formed in a protruding shape on both toes.

Further, in this sheet metal bending press machine, automatic width measurement for automatically reading the width of the sheet metal and inputting it into the computer so that the formation of the width assembly mold can be automatically performed by the control of the computer. The device may be installed along the lower mold.

[0009]

[Operation] Since the sheet metal bending press is configured as described above, the fixed die of the pressing die is mainly used for the simple bending of the sheet metal, and the spare die is used as necessary. . Furthermore, if necessary, it is possible to knit a width assembled mold that fits in the dovetail at one end where the fixed mold is absent, and when all the preliminary molds are brought close to the fixed mold, only one end bends It is also possible to knit an end mold that fits within a semi-ant bend. Therefore, in any knitting, the fixed mold does not move.

Of the above-mentioned knitting of the pressing die, the replacement die and the side dies on both sides of the forming die are not used except when the bending work is required by the knitting of the end die. At that time, those dies can be returned to the die exchange base, and the exchange dies can be exchanged while performing bending work with another die such as a fixed die or a spare die. In addition, the dovetail bending means that the both ends have a dovetail groove shape that is inverted inward, and there is not only one step or two steps of bending on one side but also several steps of bending.

[0011]

Embodiments of the present invention will now be described with reference to the drawings.

The drawings show a lower frame 1 and an upper frame 2.
Shows an example implemented in a C-shaped frame pivotally supported by a pin 3 at the rear end (FIG. 2). In the opening of the C-shaped frame, the lower mold U is attached to the lower frame 1 and the upper mold is 2 is equipped with a pressing die P, and the sheet metal W clamped by the pressing die P is bent by the blade 4. A width measuring device G for the sheet metal W is provided along the lower mold U.

As for the outline of the bending mechanism, the lower frame 1 is provided with a drive device 5 by a crank mechanism for driving the blade 4 and the upper frame 2, and the upper frame is provided via an arcuate connecting rod 6. Two swings are made. Then, various equipment such as a mold exchanging device E, which will be described later, is mounted on the upper frame 2 (FIG. 1), and the upper frame 2 including them is generally moved up and down.

The lower die U has a length close to the entire length of the machine, and is cut away at one end so that the width position thereof becomes the die exchange base B. Therefore, at the mold exchange base B, the bending of the sheet metal W cannot be performed, but the mold exchanging device E operates effectively even during the bending operation.

The upper frame 2 is provided with a beam 10 as a base material for mounting and guiding the pressing die P, and the pressing die P is mostly a fixed die 7 directly attached thereto. Therefore, in addition to the fixed mold 7, a replacement mold 8a indirectly attached to the beam 10, side molds 8b and 8b on both sides of the fixed mold 7, and a large number of spare molds brought closer to the fixed mold 7. 9a, 9b, 9b, ... And.

The fixed mold 7 is removed at one end of the lower mold U on the mold exchange base B side, and the spare molds 9a, 9b, 9b, ... Are arranged there. Of these, the leading spare mold 9a has toes 12 on both sides.
Since 12 has a so-called protruding shape on both sides of the toe, when all the preliminary molds 9a, 9b, 9b, ... Are brought close to the fixed mold 7 (in the case of FIGS. 1, 3 to 5), a The knitting of the end-assembly mold Pa that can be accommodated in the bending is performed. In addition, a combination of the replacement mold 8a and the side molds 8b, 8b on both sides thereof, or one or several spare molds 9 for the combination.
By combining a, 9b, 9b, ..., a width-assembling die Pb that fits in the dovetail bending of the sheet metal W is knitted (two-dot chain line in FIG. 1, in the case of FIGS. 6 and 7).

Side molds 8b, 8b and spare molds 9a, 9
, b are attached to supporting legs 8 and 9 which move along the beam 10, respectively (FIG. 1). The auxiliary molds 9a, 9b, 9b, ... And the side mold 8b on one side are provided with a connecting device 11 at their supporting legs 8, 9. By the way, the connecting device 11 is a male body 11.
This is due to the fitting of a and the female body, and the connected state is locked by the air cylinders individually provided in the connecting device 11 of the preliminary molds 9a, 9b, 9b ,. .

Regarding the movement of the support legs 8 and 9, the beam 1 is used.
A moving air cylinder 13 is attached to the front side of 0, and is connected to the support leg 9 of the leading spare mold 9a. Then, by driving the air cylinder 13, the entire spare molds 9a, 9b, 9b, ... Are brought close to the fixed mold 7 (knitting of the end-assembly mold Pa). Also, the width assembly mold P
For knitting b, not only the leading spare mold 9a can be connected to the side mold 8b, but also a plurality of other spare molds 9b can be connected to the side mold 8b continuously to the spare mold 9a. (In the case of FIG. 6).

The mold exchanging device E is equipped in connection with the structure for knitting the width-assembled mold Pb, and both side molds 8 are provided.
b and 8b can be opened and closed, and the replacement mold 8a is detachably sandwiched therebetween. For opening and closing,
A turnbuckle mechanism is adopted by providing a rotating shaft 17 having opposite screws at both ends, and the supporting legs 8, 8 of the side molds 8b, 8b are screwed onto the rotating shaft 17 at the upper end. In addition, the mold exchanging device E has a moving part 16 including supporting legs 8 and 8 of the side molds 8b and 8b, and the rotation of the screw bolt 20 causes the moving part 16 to move together with the replacement mold 8a and the side mold. Type 8
The positions of b and 8b change.

For attachment and detachment of the replacement mold 8a, the holder 21 of the replacement mold 8a is attached to the tip of the reversing arm 19. 23 is the reversing axis of the reversing arm 19,
The reversal position is indicated by a two-dot chain line above. Here, the storage impeller 25 is replaced with a predetermined replacement mold 8a, and the storage impeller 25 moves in the arrow direction at the time of replacement. Two
Reference numeral 7 is a rotary shaft of the storage impeller, and a large number of exchange molds 8a are exchangeably loaded around the rotary shaft.

The holder 21 is fitted vertically so that the reversing arm 19 can expand and contract, and air cylinders 29, 29 are attached to both sides of the reversing arm 19 for vertical movement. This expansion and contraction structure is necessary for exchanging the exchange mold 8a, but when knitting the width assembly mold Pb, it is necessary to remove it when pulling out the width assembly mold Pb from the dovetail of the sheet metal W. Also used to narrow the width.

Next, the procedure for bending the sheet metal W into a box shape in which the edges of the four sides are closed inward will be described with reference to FIGS. 3 to 8.

When a sheet metal W having four corners cut out in a predetermined manner is placed on an insertion table (not shown) (FIG. 3), the four sides are sequentially bent while being turned counterclockwise. For the first edge Ha to be inserted first, the fixed mold 7 is used in principle, and the spare molds 9a, 9 are used as necessary.
b, 9b, ... will also be used (see the chain double-dashed line). In any case, the replacement mold 8a and the double-sided mold 8
Since b and 8b are unnecessary, the minimum width assembly mold Pb is kept waiting by the side (see the chain double-dashed line), and if it is necessary to change the composition, those molds are transferred to the mold exchange base B. Return (solid line).

Next, when the second edge Hb is bent (FIG. 4), the pressing die P is attached to the already bent first edge Ha.
The spare dies 9a, 9b, 9
The end-assembling mold Pa, in which b, ... Is brought close to the fixed mold 7, is knitted, and the leading edge Ha is hung on the leading spare mold 9a and bending is performed. A first guide scale 31 is projectingly provided on the insertion base of the sheet metal W in order to accurately perform the edging and to measure the width of the sheet metal W by the width measuring device G. However, it is being set aside when it is not needed.

The bending of the third edge Hc (FIG. 5) is the same as the bending of the second edge Hb, and in the knitting of the end-assembly mold Pa, the second edge already bent. Hb can be hung on the leading spare mold 9a. Although the upper frame 2 is moved up and down each time due to the bending work, the exchange die 8a is exchanged at the die exchange base B regardless of the above.

In the case of bending the last fourth edge Hd (FIG. 6), the shape of the dovetail bend is formed on the sheet metal W in the width direction of the edge Hd, that is, the direction in which the width is measured by the width measuring device G. Since it is formed (FIG. 7), it is necessary to bend it by the width assembling die Pb. In this case, the minimum width assembly mold Pb that has already been knitted or the replacement mold 8a has been replaced may be used (see the chain double-dashed line in FIG. 1), but in many cases it is necessary. According to the above, the width assembly mold Pb in which the spare molds 9a and 9b are incorporated and largely knitted is used (see three-dot chain line in FIG. 1, see FIG. 7). In any case, the width-assembling die Pb is used from a position separated from the second guide scale 32 by the thickness of the sheet metal W.

The width measuring device G measures from the first guide scale 31 as a base point from a position away from the first guide scale 31 toward the fixed mold 7, and rotatably supports the spiral shaft 35 of the screw. When the proximity sensor 37 by light is screwed on and the spiral shaft 35 is rotated by the motor 39, the proximity sensor 37 scans up to the side edge of the sheet metal W, and the rotation of the spiral shaft 35 is read by the counter 41. The value is input to the computer, and is calculated together with the information such as the bending dimension which is input in advance, and the width assembly die Pb is automatically knitted.

[0028]

As described above, according to the present invention, there are the following excellent effects.

It is of course possible to adjust the width of the width assembly mold to be housed in the dovetail bending in which both ends of the sheet metal are bent inward by exchanging the replacement mold or incorporating a spare mold, as well as the end assembly mold thereof. Except when the bending process is performed by knitting, the exchange mold can always be exchanged, and it can be done even during the operation of bending the sheet metal. It is not possible to take it, and in addition, because the fixed mold does not move due to various knitting changes, work efficiency can be greatly improved and it is also suitable for energy saving.

Since the fixed mold does not need to be moved and the spare mold is arranged on only one side, the structure is simplified as a whole. Further, in the knitting of an end-assembly die that fits in a dovetail bend, the effective use length of the pressing die is substantially the same as the entire length (previously about half).

When the width measuring device is provided (Claim 2), the working efficiency can be further improved.

[Brief description of drawings]

FIG. 1 is an explanatory view of a main portion of one end of a sheet metal bending press machine as viewed from the front.

FIG. 2 is an explanatory view seen from a side of a sheet metal bending press.

FIG. 3 is an explanatory view seen from a plane showing a procedure for bending the first edge of the sheet metal.

FIG. 4 is an explanatory view seen from a plane showing a procedure for bending the second edge.

FIG. 5 is an explanatory view seen from a plane showing a procedure for bending the third edge.

FIG. 6 is an explanatory view seen from a plane showing a procedure for bending a fourth edge.

FIG. 7 is an explanatory view showing a state in which the width-assembling mold is housed in the dovetail bending of the sheet metal as seen from the front.

FIG. 8 is an explanatory view of the width measuring device as viewed from the front.

FIG. 9 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 B Mold changing base E Mold changing device G Width measuring device P Pushing mold Pa End assembly mold Pb Width assembly mold U Lower mold W Sheet metal 7 Fixed mold 8a Replacement mold 8b Side mold 9a Leading spare mold Mold 9b Spare mold 12 Toe 16 Moving part of mold changing device

Claims (2)

[Claims] 1. A form in which a sheet metal is clamped to a lower mold by a pressing mold so that a bending posture is taken, and the pressing mold comprises:
In a sheet metal bending press machine that is capable of knitting a width assembly mold that fits in a dovetail shape with both ends inverted.
Regarding the knitting, by installing a die exchange base with a lower die removed at one end, a die exchanging device that is not related to the bending posture of the sheet metal is equipped, and most of the pressing die is Is a straight or a series of fixed dies that do not need to move, and the fixed dies are cut off at one end on the side of the die exchange base, where they are placed in the dovetail shape of the sheet metal as described above. To make it possible to knit a width assembly mold with protruding toe ends on both sides, a replacement mold for narrow width adjustment and side molds on both sides of the mold are mainly used, and one side of the replacement mold is brought closer to the fixed mold for standby The spare molds are arranged in a row, and the mold exchanging device further includes a moving part so that the exchange molds and both side molds reciprocate between the upper part of the lower mold and the mold exchanging base. A sheet metal bending press machine, characterized in that the preliminary die is formed in a protruding shape on both sides of the toe. 2. An automatic width measuring device for automatically reading the width of a sheet metal and inputting the width into a computer along a lower die so that the formation of the width assembly die can be automatically performed by the control of the computer. The sheet metal bending press according to claim 1, wherein the sheet metal bending press is provided.