JPH04210821A - Device for escaping bending die - Google Patents

Abstract

PURPOSE:To prevent uneven bending due to a split die by pulling out a plunger, which supports the spacer of a split die adjacent to the outside of both ends of a plate material, by means of the rotation of a selecting pawl and removing the split die of the subject position from a pressurizing line. CONSTITUTION:By drawing the plunger 30 to the left, the spacer 32 at the tip of the plunger is removed from a pressure providing part 25. When a ram is lowered by pressure in this state, the pressure providing part 25 is lowered in a non-pressurized state to escape from the pressurizing line, and by means of the process by the ram, only the bending line of a work is bent in a V-shape. At this time, a part where bending is not required does not interfere with the lower die 14. Namely, by pulling out the spacer 32 at the prescribed position of the lower die 14, the pin of the part where the bending is not required is lowered to the extent of the thickness of the spacer, the function of the pin is restrained and the interference is prevented.

Description

[Detailed description of the invention]

[00011

[Industrial Application Field] The present invention relates to a mold relief device for a bending machine, which temporarily releases the pressure on only the split molds applied to the ends of the plate when bending the plate. Regarding a mold relief device. [0002] [0002] As a countermeasure against distortion in a bending machine such as a press brake, a wedge is provided in the lower mold to correct the height of the mold, and a bending machine with a curved ram and a row of lower molds are used during processing. A lower limit control valve is attached to a member whose capacity is not affected by side frame distortion, and the plate material is machined with maximum pressure regardless of the displacement of the side frame when pressure is applied. things are being done. [0003] In addition, a hydraulic cushion is built into the upper or lower part of the divided mold, and the hydraulic cushion function compensates for the gap between the upper and lower molds to maintain a constant pressure per length of the plate material (sheet-like workpiece). It is also known that processing can be performed using uniform pressure regardless of length. [0004]

[Problems to be Solved by the Invention] For example, in a three-point press brake, in order to apply uniform pressing force to the plate material, pressure applying members are arranged at a pitch of 25 mm in a split mold, and each standard mold with a mold width of 100 mm is Four pins correspond to each mold. However, if the bending width is narrower than the width of the split mold, or if the edge of the plate covers a part of the width of the split mold, bending the standard mold with a mold width of 100 mm will cause excessive pressure (for example, when the standard mold When the plate material is applied to a width of 50 mm, twice the pressure is applied, resulting in overpressure, so either remove the split mold that comes into contact with the edge of the plate in advance, or
Alternatively, the mold is replaced with a separate mold with a shorter mold length or a mold with a special width. Furthermore, when the lengths of the long and short sides vary in box bending work, even if the length of the long side is satisfied, the length of the mold may not be satisfied on the short side. If the edges of one split mold are slightly covered, the mold will be damaged, so generally, the work is not done by dividing the sheet material in the center, but by machining two pieces on each long and short side. Divide into groups and work in a planned manner. Note that, since the spaced portions of the folded box body are welded, as will be described later with reference to FIGS. 17 to 19, due to the cutout dimensions, unnecessary folded portions and opposing molds interfere with each other, causing scratches. [0005] Due to recent advances in handling equipment, there is a demand for technology that processes sheet materials centering on the machine for each processing step, rather than processing sheet materials by moving the processing position. In order to do this, it is necessary to remove the mold that would otherwise become improperly bent at the end of the plate. [0006] The present invention provides a metal mold by canceling the connection between the pressure applying member and the mold of any divided mold among a group of divided molds of a bending machine equipped with a hydraulic cushion function using a fluid pressure applying member. The object of the present invention is to provide a mold release device that can change the length and short side bending length of a plate material. It also aims to save labor in the mold attachment/detachment operation when adjusting the mold length. [0007]

[Means for Solving the Problems] In order to achieve the above object, the present invention arranges a large number of divided molds at the lower end of the ram or the upper end of the bed, and divides the molds into upper or lower parts of the group of divided molds. In an apparatus for bending a plate material by applying equal fluid pressure to a group of divided molds being processed by the operation of a main cylinder, the fluid pressure applying member is provided with a fluid pressure applying member, and each of the divided molds is A feature is that spacers divided into the same number as the pressure applying member are arranged between the mold and the mold, and a spacer insertion/removal means is provided for pulling out the spacer of a selected divided mold and releasing the divided mold from the pressurizing row. shall be. [0008] Furthermore, the present invention provides a lower die base in the longitudinal direction of the upper surface of the bed, arranges a large number of split molds, and pressurizes the plate material while adjusting the height of the bottom of the split molds. A bending device, in which a spacer divided into the same number as the pressure applying member is arranged between the wedge member and each divided mold, and a divided mold selected at the front or rear of the base of the lower mold. The present invention is characterized in that a spacer pulling means is provided for pulling out the spacer and releasing the split mold from the pressurizing row. [0009] In the present invention, the split molds arranged on the left and right in the center of the press can be freely engaged and selected, and the plate material (
In response to the different widths of the long and short sides of sheet-like workpieces, it increases the freedom of selection without uneven loads on the mold, and enables bending work at the center of the press, which saves labor when attaching and removing molds and bending work. It is possible to achieve automation. [0010] The spacer insertion/extraction means in the present invention includes:
A bin placed at the top or bottom of each split mold, a plunger that is slidably inserted in a direction perpendicular to the bin, has the spacer at its tip, and has a groove at its rear end, and a plunger that is inserted along the ram or bed. a shaft suspended horizontally; a select pawl that is slidably attached to the shaft and whose lower end engages with the groove of the plunger; It consists of a select pawl rotating member provided at the end of the select pawl. Further, the shaft has a polygonal cross section or a chamfered circle to support each select pawl in a non-rotating state, and has a stepped portion for attaching and detaching the select pawl at a portion in the longitudinal direction of the shaft. Another spacer insertion/extraction means includes a bottle disposed at the top or bottom of each split mold, and a plunger which is slidably inserted in a direction orthogonal to the bottle, has the spacer at its tip, and has a groove at its rear end. , a spline shaft suspended horizontally along the ram or bed, a select pawl that is slidably engaged with the spline shaft and that has its lower end engaged in series with a plurality of grooves of the plunger, and a select pawl that is arranged in a predetermined position. It consists of a select pawl rotating member provided at the end of the spline shaft for angular rotation to move the plunger forward and backward, and a select pawl slide drive member disposed above the spline shaft. [00111

[Function] Depending on the width of the plate material, at least the plunger that supports the spacer of the split mold adjacent to the outside of both ends of the plate material,
The split mold at the position is removed from the pressurizing row by being pulled out by rotation of the select claw, thereby preventing excessive load from being applied to the mold during pressurization and eliminating interference with the bending machine. [0012] [0012] Next, the present invention will be specifically explained based on the drawings. FIG. 1 is a longitudinal sectional front view of a bending machine equipped with the device of the present invention on the ram side, and FIG. 2 is an enlarged sectional view of FIG. 1. As shown in FIGS. 1 and 2, an upper die assembly 12 is attached to the lower end of the ram 10 via a holder 11, and is placed on the upper surface of the bed 13 to face the lower die 14. 15 is a side frame, and 16 is a main cylinder. The upper mold assembly 12 includes a cavity 18 formed along the internal longitudinal direction of the holder 11 and having a substantially rectangular cross section, a number of divided upper molds 20 inserted into the cavities 18, and an upper mold holder. The means 22, the fluid pressure applying means 25, the pressure applying member 28, the bottle 29 interposed at the top of each split upper mold 20, and the thickness b interposed between the fluid pressure applying means 25 and the bottle 29 The spacer 32 includes a spacer 32 and a means 35 for inserting and removing the spacer 32. [0013] Next, each part will be explained in detail. Holder 1
1 has a thin cylindrical oil chamber 26 constituting a fluid pressure applying means 25 in the center thereof. As shown in FIG. 2, the lower surface of the oil chamber 26 is stretched with a rubber sheet 27 and brought into contact with the upper surface of the pressure applying member 28. When pressurized oil is sent to the oil chamber 26, the rubber sheet 27 expands downward, and when the pressure is released, it contracts and is stretched horizontally as shown in FIG. This rubber sheet 27
is arranged in common for all the divided upper molds 20 inside the holder 11 in the longitudinal direction. At the bottom of the rubber sheet 27,
A split upper mold, a plurality of pressure applying members 28, and bottles 29 are arranged. A plunger 30 that can be slid laterally is inserted into the holder 11, a thin spacer 32 is connected to the tip of the plunger 30, and a select claw 40 forming a spacer insertion/extraction means 35 is attached to the rear end of the plunger. 41 is engaged. Spacer 32 is fixed to plunger 30 using screws 33 (FIGS. 3 and 5). Each split upper mold 20 is held by an upper mold holding means 22 consisting of a claw 23 on the front surface, a levitation lever 24, and a tightening pin and a tube (not shown) on the rear surface. [0014] There are two types of spacer insertion/removal means: one in which a select claw engaged with a shaft is moved left and right by manual operation, and the other in which the spacer is electrically moved by a slide drive member. As shown in FIGS. 5 to 9, the first type of spacer insertion/removal means 35 includes a shaft 36 horizontally suspended in the front part of the ram 10 or the holder 11, and a shaft 36.
6, and a select pawl 40 that can be moved left and right on the shaft by manual operation. shaft 36
The machine center 100 is shown in a schematic front view in FIG.
It is supported by a plurality of bearings 19 on the front surface of the holder 11 on the left and right sides of the holder 11. The shaft 36 also has a notch 37 that is half the length of the pressure applying member 28 and the bottle 29, and steps 38 for attaching and detaching the select claw are provided near both ends of the shaft (Fig. 7
). More specifically, this insertion/removal means 35 is
A bottle 29 arranged at the top of each split mold 20 and a bottle 29
A plunger 30 is slidably inserted in a direction orthogonal to the plunger 30, and has the spacer 32 at its tip and a groove 31 at its rear end.
, a shaft 36 that extends horizontally along the front or rear part of the ram 10 , a select pawl 40 that is slidably attached to the shaft 36 and whose lower end is engaged with the groove 31 of the plunger 30 , and a select It consists of a select pawl rotating member 39 provided at the end of the shaft 36 to rotate the pawl 40 by a predetermined angle. The shaft 36 has a polygonal cross section, a chamfered circular shape, or a spline shape, and supports each select pawl 40 in a non-rotating state. FIG. 5 is a sectional view when the spacer 32 is inserted between the pressure applying member 28 and the bottle 29, and FIG. 6 is a sectional view when the spacer 32 is removed. Further, the left side of FIG. 4 shows the state of FIG. 5, and the right side of FIG. 4 shows the state of FIG. FIG. 8 shows an enlarged front view of the select claw 40. This select pawl 40 has a recess 42 in its central member that engages with the shaft 36, and a pin 43 is provided on the top of the recess 42 to support a clip 44.
A spring 45 is provided near the upper end of the clip to constantly urge the tip of the clip to rotate clockwise to facilitate engagement with the shaft 36. By grasping the upper end of the clip 44 and sliding it left and right in an open state, the select claw can be moved in the longitudinal direction of the shaft. As described above, the shaft 36 has the notches 37 at 172 pitches of the mounting pitch of the pressure applying member 28, so if the width of each split mold is 25 mm,
It can be set in two stages: setting by moving every 5 mm and setting by moving 12.5 mm. FIG. 9 shows a modification of the select claw. In this case, a method is adopted in which a ball 46 and a spring 47 are buried in the upper part of the select claw, and the notch 37 of the shaft 36 is pressed into contact with the ball 46 and the spring 47. [00151 Next, the operation will be explained. A case will be described in which a rectangular panel having a long side L = 850 mm, a short side 1 = 475 mm, and a rising edge of each side of 15 mm is processed using the above apparatus. Worksheet 90 takes into account the rise of each side, and the long side is 850 + (105 x 2) 880 mm, and the short side is 475 + (15 x 2) = 505 m (with the size of [+,
It has a notch at the corner to avoid interference from the rising part. The upper part of FIG. 10 shows a split mold 20 with a width of 100+r+m,
For example, a case is shown in which 10 molds are placed closely together to form an upper mold having a mold width of 1000 mm. First, 2 of the rightmost split mold
0, replace the left end mold with the 50 mm wide mold 20a, and adjust the mold length to 850 mm, which is the length required to process the long side edge after bending the short side edge (middle row in Figure 10). . Next, 5th to 8th and 2nd from the left in the middle row of the figure.
After the spacers 32 of the 8th to 31st divided upper molds are removed from the top of the bin 29, pressure oil is sent to the oil chamber 26 to swell the rubber sheet 27. The ram 10 is driven in this state. As the ram 10 descends, the tip of the upper die touches the plate material, and then the ram 10 descends further to perform the bending process. At this time, by the action of the hydraulic cushion fluid pressure applying means 25, the bins 2 from the 9th to the 27th from the left mold are
9 becomes effective, and the short side edge is bent into an L-shape by the split mold 20 pressed against it. Next, the work is retreated, turned 180°, and bent the opposite edge. In this way, the bending of both short sides is completed. Next, spacers 32 are inserted into the 5th to 8th and 28th to 31st bins 29, and all the bins 3 from 7th to 40th are inserted.
5 is activated (lower row of Figure 10), the edge of the long side is advanced to the folding line, the ram 10 is lowered and one long side is bent, and the work is retreated and rotated 180°. The other long side is bent. [00161 FIGS. 11 and 12 show an electric type spacer insertion/extraction means 50 that automatically moves the selection pawl by a slide drive member. This spacer insertion/extraction means 50 is slidably inserted into the bin 29 disposed at the top or bottom of each split mold 20 in a direction perpendicular to the bin 29, and has the spacer at the tip and a concave groove 31 at the rear end. a spline shaft 51 that is horizontally suspended along the ram or bed; and a select pawl 55 that is slidably engaged with the spline shaft 51 and whose lower end is engaged with the groove 31 of the plunger 30. , a select pawl rotating member 54 provided at the end of the spline shaft for rotating the select pawl 55 by a predetermined angle to move the plunger forward and backward;
and a select boss 91 and a member 59 disposed above the spline shaft 51. Select claw 55
As shown in FIG. 11, a plurality of plungers can be pulled out in series (four plungers in FIG. 11) depending on the width of the divided mold. A gear 52 such as a sector gear is provided at one end of the spline shaft 51, and a rack par 53 is engaged with the gear 52 to form a select pawl rotating member 54. This select nail 5
5 has a central member engaged with a spline shaft 51, has a slider 55a on its upper part, and has its lower tip 55b engaged with each groove 31 of a plurality of adjacent plungers as described above. The slider 55a is engaged with the LM guide 49 of the bracket 48 projecting from the holder 11, and is attached to be slidable in the longitudinal direction of the spline shaft 51. L
A chain 58 is placed around the M guide 49 between the driving sprocket 56 and the driven sprocket 57, and both ends of the chain are fixed to the slider 55a, and the select boss 9 is secured to the slider 55a.
A first member 59 is configured. [00171 By driving the drive sprocket 56 and causing the chain 58 to run, the select pawl 55 guided by the LM guide 49 slides left and right along the spline shaft 51. After stopping the select pawl 55 at a predetermined position, the rack par 53 is driven and the gear 52 at the end of the spline shaft is rotated to rotate the select pawl 55 by a predetermined angle and pull the plurality of plungers 30 together. , or by pushing it in and pulling out the spacer 32 to perform the insertion operation. [0018] FIGS. 13 to 16 show an embodiment in which a spacer 32 similar to that described above is attached to the divided lower mold 14. Although the fluid pressure applying means may be arranged at the lower part of the divided lower mold, this embodiment shows a case where a wedge member is provided at the lower part of the three-point type lower mold. The wedge member 70 is manufactured by the Special Publication Corporation Sho 64-9.
As disclosed in Publication No. 891, the basic wedge 71.7
2, and the effective height of the wedge member 70 is changed by driving a hydraulic cylinder (not shown) provided with a basic wedge 72 at one end. . In addition, in the above figure, 60 is a lower mold base, 61 is a bottle-shaped pressure receiving piece inserted into the lower mold 14, and 62
63 is a storage chamber for the wedge member 70; 64 is a pressure applying member;
6 is a recess provided on the side of the storage chamber, 65 is a protrusion erected in the recess, and 66 is a small hole drilled near the rear end of the spacer 32, which is engaged with the protrusion 65 during processing. 67 is a plunger for inserting the spacer, and the tip has the spacer 32G
It has a protrusion 68 that engages with the small hole 66, a protrusion 69 that engages with the small hole 66 of the spacer 3 at the rear end, and a recess that engages with the tip of the select claw 50 at the rear end. It has a groove 37. A lower mold holder 80 is placed on the upper part of the lower mold plate 760, and two types of lower molds 14 and 14 are arranged in front and behind on the upper part of the holder 80, and a shift cylinder 81 is provided on the side wall of the holder 80. There is. By driving the shift cylinder 81, either the front or rear lower die rows can be advanced to the processing line. [0019] FIG. 13 is a sectional view of the lower mold on the mold processing line, showing a state in which the plunger 67 is moved to the right and the spacer 32 at the tip is inserted into the lower part of the pressure applying member 62. A small hole 66 near the rear end of the spacer 32 has a plunger 6
7 of the protrusions 67 are engaged. During processing, as shown in FIG. 14, the pressure applying member 62 is lowered, and as a result, the small hole 66 at the rear end of the spacer 32 is closed to the protrusion 68 of the plunger.
The puller is pulled out and engaged with the protrusion 65 in the recess 64. FIG. 14 shows the lower mold 14 removed from the mold row. That is, the plunger A 67 is pulled to the left as shown by the arrow, and the spacer 32 at its tip is removed from the pressure applying member 62. If the ram is pressurized and lowered in this state, the pressure applying member 62 will be lowered without receiving pressure, as shown in FIG. 15, and will be released from the pressure line. FIG. 17 is a front view showing the die arrangement when V-bending only the short side of the cut workpiece 90 as shown in FIG. First, each bottle-shaped pressure-receiving piece 61 (three pieces from the left in FIG. 17) in the lower mold corresponding to the width of the part 91 that does not require bending of the workpiece is kept in a relieved state as shown in FIG. Length l of folding line 92
only is V-bent. At this time, the portion 91 that does not require bending and the lower mold 91 do not interfere with the lower mold 14. That is,
Since the partitions of the folded box are usually welded, it is necessary to reduce the gap at the corners of the product, and due to the board dimensions (Fig. 18),
The unnecessary bending part 91 interferes with the lower die as it is bent and causes scratches. However, in the present invention, as shown in FIG. By lowering the bottle by the thickness of the spacer, the action of the bottle can be inhibited and interference can be prevented. [00201] [Effects of the Invention] As described above, the present invention provides a method for disposing a divided spacer between the fluid pressure applying member and the divided mold, or between the wedge member and the bottle in the lower mold, A spacer inserting/extracting means is provided to pull out the selected spacer and release it from the pressurized row, and it is possible to efficiently bend plate materials of various crystallinities by preventing uneven bending caused by the split die.

[Brief explanation of the drawing]

FIG. 1 is a front view of a bending machine equipped with a mold release device of the present invention.

FIG. 2 is an enlarged sectional view of FIG. 1;

FIG. 3 is an enlarged plan view showing the plunger of the spacer insertion/extraction means.

FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 2;

5 is a sectional view taken along line V-V in FIG. 4. FIG.

6 is a sectional view taken along the line VI-VI in FIG. 4. FIG.

FIG. 7 is a plan view of a shaft supporting a select pawl.

8 and 9 are side views of a modified example of the select claw.

FIG. 10 is a schematic front view during a bending action.

FIG. 11 is a front view of the select pawl electric slide device.

FIG. 12 is an enlarged sectional view of the same as above.

FIG. 13 is a cross-sectional view of the spacer inserted into the lower mold.

FIG. 14 is a sectional view when releasing the lower mold.

FIG. 15 is a cross-sectional view of the lower mold bin at the time of cancellation.

FIG. 16 is a cross-sectional view when pressure is applied at step 15. FIG. 17 is a schematic front view showing the relationship between the workpiece and the folding die when a spacer is provided in the bin of the lower mold. FIG. 18 is a plan view showing a state in which the workpiece is cut out.

FIG. 19 is an enlarged cross-sectional view showing that the bottle and the unnecessary portion of the lower die do not interfere with each other.

[Explanation of symbols]

10 Ram 11 Holder 12 Upper mold assembly 13 Bed 14 Lower mold 15 Side frame 16 Main cylinder 18 grooves 19 Bearing part 20 Split upper mold 22 Upper mold holding means 25 Fluid pressure applying member 26 Oil room 28 Pressure applying member 29 bottle 30 Plunger Spacer Spacer insertion/removal means shaft Stepped section select nails bottle Spring ball Spring Select pawl rotating member select nails Select claw slide drive member base Bottle-shaped pressure receiving piece Pressure applying member recess protrusion plunger wedge member lower mold holder shift cylinder Plate material 100 Machine center

[Procedural amendment]

[Submission date] January 7, 1992

[Procedural amendment 1]

[Name of document to be amended] Specification

[Name of item subject to amendment] Claim 1

[Correction method] Change

[Correction details]

Claim 1: A large number of divided molds are arranged at the lower end of the ram or the upper end of the bed, and a divided fluid pressure applying member is installed at the upper or lower part of the divided mold group. n
In an apparatus that pressurizes and bends a plate material while applying equal fluid pressure, spacers divided into the same number as the pressure applying member are disposed between the fluid pressure applying member and each divided mold, and A mold release device for a bending machine, characterized in that a spacer insertion/extraction means is provided for pulling out a spacer of a selected split mold and releasing the split mold from a pressurizing row.

[Procedural amendment 2]

[Name of document to be amended] Specification

[Amended item name] Claim 2

[Correction method] Change

[Correction details]

Claim 2: A lower mold base is provided in the longitudinal direction of the upper surface of the bed, and a large number of divided molds are arranged, and a wedge member is provided at the bottom of the divided mold group, and the four high support sections of the bottom of the mold are connected to the upper part of the bed. The apparatus is a device for bending a sheet material by applying pressure in a state in which the spacer is bent, in which divided spacers of the same number as the pressure applying member are arranged between the wedge member and each divided mold, and the front part of the lower die spacer or A mold release device for a bending machine, characterized in that a spacer insertion/extraction means is provided at the rear for pulling out a spacer of a selected divided mold and releasing the divided mold from a pressurizing row.

[Procedural amendment 3]

[Name of document to be amended] Specification

[Correction target item name] 0002 [Correction method] Change

[Correction details]

[0002]

[Prior Art] As a countermeasure against distortion in bending machines such as press brakes, the height of the mold is corrected by inserting and removing a crotch wedge into the lower mold, and the upper part is sharply moved along the curve of the ram during processing. In addition, a lower limit control valve was installed on a member that is not affected by pressure due to the distortion of the side frame, so that the maximum pressure can be applied regardless of the displacement of the side frame during pressurization. Processing of plate materials is carried out.

[Procedural amendment 4]

[Name of document to be amended] Specification

[Correction target item name] 0007 [Correction method] Change

[Correction details]

[0007]

[Means for Solving the Problems] In order to achieve the above object, the present invention arranges a large number of divided molds at the lower end of the ram or the upper end of the bed, and divides the molds into upper or lower parts of the group of divided molds. In an apparatus for bending a plate material by applying equal fluid pressure to a group of divided molds by providing a fluid pressure applying member, the pressure applying member is provided between the fluid pressure applying member and each divided mold. The present invention is characterized in that spacers divided into the same number are arranged, and a spacer insertion/removal means is provided for pulling out the spacer of a selected divided mold and releasing the divided mold from the pressurizing row.

[Procedural amendment 5]

[Name of document to be amended] Specification

[Correction target item name] 0008 [Correction method] Change

[Correction details]

[0008] Furthermore, the present invention provides a lower mold base in the longitudinal direction of the upper surface of the bed and arranges a large number of divided molds, and provides a wedge member at the bottom of the group of divided molds to adjust the height of the bottom of the lower mold. A device that bends a plate by applying pressure in an adjusted state,
A spacer divided into the same number as the pressure applying member is arranged between the wedge member and each divided mold, and the spacer of the selected divided mold is pulled out from the front or rear of the base of the lower mold to separate the divided mold. It is characterized by providing a spacer insertion/removal means for releasing the mold from the pressurizing row.

[Procedural amendment 6]

[Name of document to be amended] Specification

[Correction target item name 10010 [Correction method] Change

[Correction details]

[00101 The spacer insertion/removal means in the present invention includes:
A bin placed at the top or bottom of each split mold, a plunger that is slidably inserted in a direction perpendicular to the bin, has the spacer at its tip, and has a groove at its rear end, and a plunger that is inserted along the ram or bed. a shaft suspended horizontally; a select pawl that is slidably attached to the shaft and whose lower end engages with the groove of the plunger; It consists of a select pawl rotating member provided at the end of the select pawl. Further, the shaft has a polygonal cross section or a chamfered circle to support each select pawl in a non-rotating state, and has a stepped portion for attaching and detaching the select pawl at a portion in the longitudinal direction of the shaft. Another spacer insertion/extraction means includes a bottle disposed at the top or bottom of each split mold, and a plunger which is slidably inserted in a direction orthogonal to the bottle, has the spacer at its tip, and has a groove at its rear end. , a spline shaft horizontally suspended along the ram or bed, a select pawl slidably engaged with the spline shaft and having a lower end engaged in series with a plurality of grooves of the plunger, and a select pawl. It consists of a select pawl rotating member provided at the end of the spline shaft to move the plunger forward and backward by rotating a predetermined angle, and a select pawl slide drive member disposed above the spline shaft.

[Procedural amendment 7]

[Name of document to be amended] Specification

[Correction target item name 10011 [Correction method] Change

[Correction details]

[0011]

[Operation] Depending on the width of the plate material, at least the plunger that supports the spacer of the split mold adjacent to the outside of both ends of the plate material,
The split mold at the position is removed from the pressing row by being pulled out by rotation of the select claw, thereby preventing excessive load on the mold during pressurization and eliminating interference with the bending mold.

[Procedural amendment 8]

[Name of document to be amended] Specification

[Correction target item name] Figure 14

[Correction method] Change

[Correction details]

FIG. 14 is a sectional view when adjusting the lower die.

[Procedural amendment 10]

[Name of document to be corrected] Drawing

[Correction target item name] Figure 4

[Correction method] Change

[Correction details]

[Figure 4]

Claims (6)

[Claims] Claim 1: A large number of divided molds are arranged at the lower end of the ram or the upper end of the bed, and a divided fluid pressure application member is provided at the upper or lower part of the divided mold group, and the processing is performed by the operation of the main cylinder. In the apparatus for bending a plate material by applying equal fluid pressure to a group of divided molds, spacers divided into the same number as the pressure applying members are provided between the fluid pressure applying member and each divided mold. What is claimed is: 1. A mold release device, characterized in that it is provided with a spacer insertion/removal means for pulling out a spacer of a selected split mold and releasing the split mold from the pressurizing row. 2. A lower mold base is provided in the longitudinal direction of the upper surface of the bed, and a number of divided molds are arranged, and a wedge member is provided at the bottom of the group of divided molds, and the divided molds are processed by the operation of a main cylinder. This is a device that pressurizes and bends a plate material while adjusting the height of the bottom of the lower mold for the group, and the device has the same number of pressure applying members between the wedge member and each divided mold. The folding machine is characterized in that the divided spacers are arranged and spacer insertion/extraction means is provided at the front or rear part of the lower mold spacer to pull out the selected divided mold spacer and release the divided mold from the pressurizing row. Mold relief device for bending machines. 3. The spacer insertion/extraction means includes a pin disposed at the top or bottom of each split mold, and a plunger slidably inserted in a direction orthogonal to the pin, having the spacer at its tip and a concave groove at its rear end. , a shaft horizontally suspended along a ram or bed, a select claw slidably attached to the shaft and engaged in a groove of the plunger at its lower end; 3. The mold releasing device for a bending machine according to claim 1, further comprising a select pawl rotating member provided at an end of the shaft for advancing and retracting the mold. 4. The shaft has a polygonal cross section, a chamfered circular shape, or a spline to support each select pawl in a non-rotating state, and has a stepped portion for removing and removing the select pawl at a portion in the longitudinal direction of the shaft.
Mold relief device for the bending machine described. 5. The spacer insertion/extraction means includes a plunger which is slidably inserted into a pin disposed at the top or bottom of each split mold in a direction perpendicular to the pin, has the spacer at its tip, and has a groove at its rear end. a spline shaft suspended horizontally along the ram or bed; a select pawl that is slidably engaged with the spline shaft and that is engaged in series with a plurality of concave grooves of the plunger at its lower end; Claim comprising: a select pawl rotating member provided at an end of the spline shaft for rotating the plunger by a predetermined angle to move the plunger forward and backward; and a select pawl slide drive member disposed above the spline shaft. A mold relief device for a bending machine according to 1 or 2. 6. A holder is provided that can move the upper surface of the lower mold base in a direction perpendicular to the folding line, and several rows of lower mold groups are arranged on the upper part of the holder, while the rear wall of the lower mold base is 3. The mold release device for a folding machine according to claim 2, further comprising a shift mechanism for selectively moving the front and rear mold groups forward and backward on the folding line.