阅读说明：本技术 弯板机 (Plate bending machine ) 是由 佐藤正昭 林史郎 于 2020-04-27 设计创作，主要内容包括：在弯板机(10)的上部工作台(24)的正面的下端侧设有沿左右方向延伸的安装基座(28)。在安装基座(28)沿左右方向隔开间隔地形成有向下方突出的多个突出片(32)。在安装基座(28)的正面上的左右方向上相邻的突出片(32)之间设有上部模具保持件(38)。在突出片(32)的背面安装有连结部件(64),连结部件(64)的前端位于上部工作台(24)的背面侧。在连结部件(64)的前端面连结有能够沿左右方向移动地支撑移动体(74)的导向部件(70)。(A mounting base (28) extending in the left-right direction is provided on the lower end side of the front surface of an upper table (24) of a plate bending machine (10). A plurality of projecting pieces (32) projecting downward are formed on the mounting base (28) at intervals in the left-right direction. Upper mold holders (38) are provided between the laterally adjacent projecting pieces (32) on the front surface of the mounting base (28). A connecting member (64) is attached to the rear surface of the projecting piece (32), and the tip of the connecting member (64) is positioned on the rear surface side of the upper table (24). A guide member (70) which supports the moving body (74) so as to be movable in the left-right direction is connected to the front end surface of the connecting member (64).)

1. A plate bending machine is characterized by comprising:

a mounting base which is provided on the front surface of the upper table, extends in the left-right direction, and has a plurality of projecting pieces projecting downward at intervals in the left-right direction;

an upper mold holder which is provided between the protruding pieces adjacent in the left-right direction on the front surface of the mounting base and holds an upper mold;

a plurality of connecting members, each of which is attached to a back surface of each of the plurality of projecting pieces and has a tip positioned on a back surface side of the upper table; and

and a guide member which is connected to front end surfaces of the plurality of connecting members, extends in the left-right direction, and supports the moving body so as to be movable in the left-right direction on the back surface side of the upper table.

2. The plate bending machine according to claim 1,

the projecting pieces are first regulating members for regulating the lateral displacement of the upper die holder with respect to the upper table, respectively.

3. Plate bending press according to claim 1 or 2,

the connecting members are second regulating members for regulating the lateral displacement of the upper die holder with respect to the upper table, respectively.

4. The plate bending machine according to any one of claims 1 to 3,

the moving body is an upper mold exchanging unit that automatically exchanges the upper mold with respect to the upper mold holder.

5. A plate bending machine is characterized by comprising:

a plurality of fixed metal fittings which are arranged on the front surface of the upper workbench at intervals in the left-right direction;

a plurality of upper mold holders which are arranged at a lower end side of the upper table at intervals in a left-right direction, have an attachment plate which is pressed against a front surface side of the upper table by each fixing metal fitting, and hold an upper mold; and

and a regulating member provided on each of right and left sides of each upper mold holder of the upper table, and regulating a lateral shift of the upper mold holder with respect to the upper table.

6. The plate bending machine according to claim 5,

the limiting parts are respectively arranged on the front surface of the upper workbench,

each lower end surface of the regulating member is located above the lower end surface of the upper table or at the same height as the lower end surface of the upper table.

7. The plate bending machine according to claim 5,

the limiting members are respectively arranged at the lower end side of the back surface of the upper workbench,

each front surface of the regulating member is located more rearward than the pressing center position.

Technical Field

The present invention relates to a plate bending machine for bending a plate-shaped workpiece [ workbench ] by cooperation of an upper die [ upper tool ] and a lower die [ lower tool ].

Background

Patent document 1 discloses a plate bending machine provided with atc (auto Tool changer). In the plate bender, an upper die replacing unit for automatically replacing the upper die is mounted on the back side of the upper table. In this case, a modular upper die holder, which is equipped with an upper die exchange unit and extends in the left-right direction, is often provided at the lower end (lower end side) of the upper table. The modular upper die holder is provided with a guide member on the rear surface side of the upper table for supporting the upper die exchanging unit so as to be movable in the left-right direction. The guide member extends in the left-right direction. Since the guide member is directly provided to the modular upper mold holder, parallelism of the guide member with respect to the modular upper mold holder can be maintained with high accuracy.

On the other hand, in most of stand-alone bender machines not equipped with ATC, a plurality of fixing metal fittings are provided on the front surface of the upper table at intervals in the left-right direction. A plurality of universal upper die holders serving as an intermediate plate type are arranged at intervals in the left-right direction on the lower end side of the upper table. The general upper die holder has a mounting plate pressed against the front surface of the upper table by a fixing metal fitting. That is, a common upper mold holder is provided on the lower end side (front lower end portion) of the front surface of the upper table at a distance in the left-right direction with a fixed metal fitting interposed therebetween.

In order to avoid interference between the lateral flange of the workpiece and a part of the plate bender (such as an upper die holder) due to the upward tilting of the workpiece during bending of the workpiece, an escape space is formed between adjacent upper die holders. The lateral flange is a flange that is bent on one side or both sides in the left-right direction of the workpiece. In addition, in order to avoid interference between the lateral flange and a part of the press brake even when the lateral flange is positioned at an arbitrary position in the left-right direction with respect to the upper table, a general-purpose upper die holder is configured to be capable of position adjustment in the left-right direction with respect to the upper table. Patent documents 2 to 6 below are also included as background art related patent documents.

Documents of the prior art

Patent document

Patent document 1: japanese patent No. 4672868 publication

Patent document 2: japanese patent No. 5841800 publication

Patent document 3: japanese patent No. 5947861 publication

Patent document 4: japanese laid-open patent application No. 2003-71519

Patent document 5: japanese laid-open patent publication No. 2015-120185

Patent document 6: japanese laid-open patent publication No. 2004-344918

Disclosure of Invention

In recent years, it has been desired to assemble ATCs in a monolithic press brake. When the upper die exchange unit is to be attached to the back surface side of the upper table in a single plate bending machine, the guide member cannot be directly attached to the upper die holder due to space limitations. Further, since there is a concern about interference between the upper die holder and the upper die exchanging unit, it is also difficult to directly attach the guide member to the back surface of the upper table. Therefore, it is conceivable that a plurality of coupling members are provided on the lower end side of the back surface of the upper table at intervals in the left-right direction, and a guide member extending in the left-right direction is integrally coupled to the front end surfaces of the plurality of coupling members.

In this case, the attachment reference surface of the upper die holder in the front-rear direction is a machined surface finished by machining on the lower end side of the front surface of the upper table. The mounting surface of the guide member is a front end surface of the coupling member, and the mounting reference surface of the guide member in the front-rear direction is a machined surface finished by machining on a lower end side of the rear surface of the upper table on which the coupling member is mounted. That is, the mounting reference surface of the upper die holder and the mounting reference surface of the guide member are different. Therefore, when the upper die exchange unit is mounted to the single plate bender, it is not easy to accurately maintain the parallelism of the guide member with respect to the upper die holder. As a result, it is difficult to sufficiently ensure the reliability of the replacement operation of the upper die replacement unit. This occurs similarly in the case where a single plate bender supports a movable body other than the upper die exchanging unit on the back surface side of the upper table so as to be movable in the left-right direction by a guide.

The invention aims to provide a plate bending machine which can make the installation reference surface of an upper die holder and the installation reference surface of a guide component identical.

A first aspect of the present invention provides a plate bending machine including: a mounting base which is provided on the front surface of the upper table, extends in the left-right direction, and has a plurality of projecting pieces projecting downward at intervals in the left-right direction; an upper mold holder which is provided between the protruding pieces adjacent in the left-right direction on the front surface of the mounting base and holds an upper mold; a plurality of connecting members, each of which is attached to a back surface of each of the plurality of projecting pieces and has a tip positioned on a back surface side of the upper table; and a guide member which is connected to front end surfaces of the plurality of connecting members, extends in the left-right direction, and supports the moving body movably in the left-right direction on the back surface side of the upper table.

In addition, when the workpiece is bent, the lower surface of the upper table tends to be bent in a concave shape by a bending load (bending pressure force), and the upper surface of the lower table tends to be bent in a concave shape. If the upper table and the lower table are greatly deflected, a lateral deviation (lateral displacement) of the common upper mold holder with respect to the upper table is likely to occur. If a lateral deviation occurs, interference between the lateral flange and a part of the press brake occurs, and a bending failure occurs, so that high-precision bending cannot be stably performed. This occurs in the same manner in a plate bending machine equipped with ATC only, and in a single plate bending machine not equipped with ATC. That is, it is desirable to limit the lateral offset of the upper mold holder relative to the upper table.

A second aspect of the present invention provides a plate bending machine including: a plurality of fixed metal fittings which are arranged on the front surface of the upper workbench at intervals in the left-right direction; a plurality of upper mold holders which are arranged at a lower end side of the upper table at intervals in a left-right direction, have an attachment plate which is pressed against a front surface side of the upper table by each fixing metal fitting, and hold an upper mold; and a regulating member provided on each of right and left sides of each upper mold holder of the upper table, and regulating a lateral shift of the upper mold holder with respect to the upper table.

Drawings

Fig. 1 is a schematic front view showing a plate bending machine of a first embodiment.

Fig. 2 is an enlarged view of a portion II of fig. 1.

Fig. 3 is an enlarged view of section III of fig. 2.

Fig. 4 is a sectional view taken along line IV-IV of fig. 2.

Fig. 5 is a cross-sectional view taken along line V-V of fig. 2.

Fig. 6 is a partial front view showing the mounting base.

Fig. 7 is a schematic front view showing a plate bending machine of a second embodiment.

Fig. 8 is an enlarged view of a portion VIII of fig. 7.

Fig. 9 is an enlarged sectional view taken along line IX-IX of fig. 8.

Fig. 10 is a partial front view showing a plate bender according to modification 1 of the second embodiment.

Fig. 11 is an enlarged sectional view taken along line XI-XI of fig. 10.

Fig. 12 is a partial front view showing a plate bender according to modification 2 of the second embodiment.

Fig. 13 is an enlarged sectional view taken along line XIII-XIII of fig. 12.

Detailed Description

Embodiments (including modifications) of the present invention will be described with reference to fig. 1 to 6.

The "width direction" includes, unless otherwise specified, the width direction of the upper die, the width direction of the lower die, the width direction of the upper die holder, and the width direction of the plate bender. The "left-right direction" is one of the horizontal directions, and is the same as the width direction of the plate bender. The "front-rear direction" is one of the horizontal directions, and is a direction orthogonal to the left-right direction. The "pressing center position" refers to a position in the front-rear direction of an imaginary vertical plane passing through the tip of the punch. In the figure, "L" represents a left direction, "R" represents a right direction, "FF" represents a front direction, "FR" represents a rear direction, "U" represents an upper direction, and "D" represents a lower direction.

(first embodiment)

As shown in fig. 1 and 2, a plate bending machine 10 according to a first embodiment is a machine for bending a plate-like workpiece (sheet metal) W by cooperation of an upper die (punch) 12 and a lower die (die) 14, which are automatically replaceable. A locking hole 12h is formed through the center of the upper mold 12 in the lateral direction (width direction). A drop-preventing groove 12g (see fig. 4) is formed in the left-right direction in the shank portion [ shank ]12s (see fig. 4) of the upper die 12. A locking hole 14h is formed through the center of the lower mold 14 in the lateral direction.

The plate bender 10 includes a main body frame 16. The main body frame 16 includes a pair of side plates 18 facing each other in a lateral direction in a spaced-apart manner, and a plurality of beam members 20 (only one is shown) connecting the pair of side plates 18. A lower table 22 extending in the left-right direction is provided at the lower portion of the main body frame 16. An upper table 24 extending in the left-right direction is provided on the upper portion of the main body frame 16 so as to be movable in the left-right direction. Hydraulic cylinders 26 are provided as vertical-driving actuators for vertically moving the upper table 24 relative to the main body frame 16 at the upper portions of the side plates 18. The upper table 24 may be configured to be movable in the vertical direction, and the lower table 22 may be configured to be movable in the vertical direction. As the vertical movement actuator, a servo motor may be used instead of the hydraulic cylinder 26.

As shown in fig. 2 to 6, a machined surface 24f finished by machining is formed in the left-right direction on the lower end side of the front surface of the upper table 24. A plate-like mounting base 28 extending in the left-right direction is attached to the machined surface 24f of the upper table 24 by a plurality of mounting bolts 30. Each mounting bolt 30 penetrates a bolt hole 28h formed in the mounting base 28. The front and back surfaces of the mounting base 28 are finished by machining. A plurality of projecting tabs 32 projecting downward are formed at equal intervals in the left-right direction on the lower end side of the mounting base 28. The plurality of projecting pieces 32 may be arranged at intervals in the left-right direction, and may not be arranged at equal intervals.

A plurality of fixing metal fittings (fixing plates) 34 are attached to the front surface of the mounting base 28 by mounting bolts 36 at intervals in the left-right direction. That is, the fixing metal fittings 34 are provided on the front surface of the upper table 24 at intervals in the left-right direction via the mounting base 28 and the mounting bolts 36. A claw portion [ paw ]34c is formed in the left-right direction at the lower end of the back surface of the fixed metal fitting 34. Each mounting bolt 36 penetrates a bolt hole 28v formed in the mounting base 28.

An upper mold holder 38 for detachably holding the upper mold 12 is disposed at a left-right direction at a distance from the lower end of the upper table 24. The upper die holder 38 has a mounting plate 40 pressed against the front surface of the upper table 24 by the fixing metal fittings 34. That is, the upper die holder 38 is provided at a left-right direction interval via the fixed metal fitting 34 on the lower end side of the upper table 24. The upper die holder 38 is disposed between the projecting pieces 32 adjacent in the left-right direction on the front surface of the mounting base 28. The upper die holder 38 has a structure disclosed in patent document 2, for example. The structure of the upper die holder 38 will be briefly described below.

As shown in fig. 2 to 5, an engagement groove 40g that engages with the claw portion 34c of the fixed metal fitting 34 is formed in an upper portion of the front surface of the attachment plate 40. A holder main body (intermediate plate) 42 is attached to a lower portion of the back surface of the attachment plate 40 by a plurality of attachment bolts (not shown). The holder main body 42 is located on the lower side of the upper table 24. That is, the holder main body 42 is provided below the upper table 24 via the mounting plate 40. The upper surface of the holder main body 42 is formed as an inclined surface 42f inclined in the front-rear direction.

Between the holder main body 42 and the upper table 24, a wedge member [ wedge member ]44 is provided, the position of which is adjustable in the front-rear direction with respect to the holder main body 42. The lower surface of the wedge member 44 is formed as an inclined surface 44f inclined in the front-rear direction. The inclined surface 44f is in sliding contact with the inclined surface 42f of the holder main body 42. A pressing bolt 46 for pushing the wedge member 44 rearward is provided at the center in the left-right direction of the attachment plate 40. Pulling bolts 48 for pulling the wedge member 44 forward are provided on the right and left sides of the pressing bolt 46 of the mounting plate 40, respectively.

A clip 50 for pressing the shank 12s of the upper die 12 against the holder main body 42 is swingably attached to the front surface of the holder main body 42 via a plurality of support shafts 52. A clip 50 for pressing the shank portion 12s against the holder main body 42 is also swingably attached to the back surface of the holder main body 42 via a plurality of support shafts 52. A hook member 54 that can be locked in the drop-preventing groove 12g of the upper mold 12 is formed on the lower end side of each clip 50. Further, a clip cylinder (not shown) for pressing the pair of clips 50 is provided inside the holder body 42. A spring 56 that biases each clip 50 in a direction of releasing the pressing operation is interposed between the holder body 42 and each clip 50.

As shown in fig. 2, 3, and 6, in the present embodiment, the mounting plate 40 of the upper die holder 38 is interposed between the projecting pieces 32 adjacent in the left-right direction. The projecting piece 32 of the mounting base 28 is a first regulating member that contacts the side surface of the mounting plate 40 and regulates the lateral displacement (lateral displacement) of the upper die holder 38. That is, the projecting pieces 32 (first regulating members) are provided on both the left and right sides of each mounting plate 40 on the front surface of the upper table 24. Further, between the adjacent upper die holders 38, a relief space S is formed for avoiding interference between the lateral flange Wf and a part of the press bender 10 (the upper die holder 38 or the like) due to the lifting of the workpiece W. In fig. 6, the upper die holder 38 and the connecting member [ connecting member ]64 are shown by two-dot chain lines.

As shown in fig. 1 and 2, a lower die holder 58 that detachably holds the lower die 14 is provided at the upper end of the lower table 22. The lower die holder 58 extends in the left-right direction. The lower die holder 58 has a structure disclosed in patent document 1, for example.

As shown in fig. 1, the plate bender 10 is equipped with an atc (auto Tool changer)60 for performing automatic replacement of the upper mold 12 and the lower mold 14. A mold storage device 62 for storing the plurality of upper molds 12 and the plurality of lower molds 14 is disposed on one side (right side) in the left-right direction of the main body frame 16 of the ATC 60. The mold housing device 62 has a structure disclosed in, for example, patent documents 1, 3, and 4. The mold housing device 62 has a plurality of upper hoppers (not shown) holding a plurality of upper molds 12 at an upper portion thereof. The selected upper stocker is positioned at the upper mold exchanging position located at the side of the upper mold holder 38. The mold housing device 62 has a plurality of lower stockers (not shown) for holding the plurality of lower molds 14 at the lower portion thereof. The selected lower stocker is positioned at the lower mold exchanging position located at the side of the lower mold holder 58.

As shown in fig. 2 to 6, a rectangular plate-shaped coupling member 64 is attached to the back surface of each projecting piece 32 of the attachment base 28 by a plurality of attachment bolts 66. Each mounting bolt 66 penetrates the bolt hole 28b formed in the mounting base 28. The front end side (rear end side) of the coupling member 64 is positioned on the rear surface side of the upper table 24. The base end face (front end face) and the front end face (rear end face) of each connecting member 64 are finished by machining. In order to prevent the coupling member 64 from being bent, the coupling member 64 is coupled to the lower end surface of the upper table 24 by a plurality of coupling bolts 68. The coupling member 64 is a second regulating member that contacts the side surface of the holder main body 42 and regulates the lateral displacement of the upper die holder 38. That is, the coupling members 64 (second regulating members) are provided on both the left and right sides of the upper die holder 38 on the lower end side of the upper table 24.

As shown in fig. 1, 4, and 5, an upper guide member 70 extending in the left-right direction is integrally coupled to a rear end surface of the coupling member 64 by a coupling bolt 72. The left end of the upper guide member 70 protrudes leftward from the upper table 24. The right end of the upper guide member 70 protrudes rightward from the upper table 24 and overlaps the mold housing device 62. The upper guide member 70 has a rail portion [ rail ]70r extending in the left-right direction on the rear surface thereof. Further, a pair of upper mold exchanging units 74 for automatically exchanging the upper mold 12 are provided on the rail portion 70r so as to be movable in the left-right direction. That is, the upper guide member 70 supports a pair of upper mold exchanging units 74 as moving bodies on the back side of the upper table 24 so as to be movable in the left-right direction. The upper die exchanging unit 74 is capable of detaching the upper die 12 from the upper die holder 38 (or the upper stocker positioned at the upper die exchanging position) in the front-rear direction and the left-right direction. The upper die exchange unit 74 can attach the upper die 12 to the upper die holder 38 (or the upper stocker positioned at the upper die exchange position) in the front-rear direction and the left-right direction.

The upper mold exchanging unit 74 has a structure disclosed in patent document 1, for example. The upper mold exchanging unit 74 includes: an upper unit main body 76 provided on the rail portion 70r of the upper guide member 70 to be movable in the right-left direction; and an upper mold holding member 78 provided to the upper unit body 76. The upper die holding member 78 is a rod-like or hook-like member that can be engaged with the engaging hole 12h of the upper die 12. The upper die holding member 78 is configured to be movable in the front-rear direction and the up-down direction with respect to the upper unit main body 76. The upper die holding member 78 is also immovable in the vertical direction with respect to the upper unit main body 76. The description of the replacement operation of the upper mold replacing unit 74 is omitted.

As shown in fig. 1, a lower guide member 80 extending in the left-right direction is attached to the rear surface of the lower die holder 58. The left end of the lower guide member 80 protrudes leftward from the lower table 22. The right end of the lower guide member 80 protrudes rightward from the lower table 22 and overlaps the mold housing device 62. A pair of lower die exchanging units 82 for automatically exchanging the lower dies 14 are provided on the lower guide member 80 so as to be movable in the left-right direction. The lower die exchanging unit 82 is capable of detaching the lower die 14 from the lower die holder 58 (or the lower stocker positioned at the lower die exchanging position) in the front-rear direction and the left-right direction. The lower die exchanging unit 82 can attach the lower die 14 to the lower die holder 58 (or the lower stocker positioned at the lower die exchanging position) in the front-rear direction and the left-right direction.

The lower mold exchanging unit 82 has a structure disclosed in patent document 1, for example. The lower mold exchanging unit 82 includes: a lower unit body 84 provided to the lower guide member 80 to be movable in the right-left direction; and a lower mold holding member 86 provided to the lower unit body 84. The lower die holding member 86 is a rod-like or hook-like member that can be engaged with the engaging hole 14h of the lower die 14. The lower die holding member 86 is configured to be movable in the front-rear direction and the left-right direction with respect to the lower unit main body 84. Note that the description of the replacement operation of the lower die replacement unit 82 is omitted.

Next, the effects of the present embodiment will be explained.

In the present embodiment, the mounting base 28 is provided on the lower end side of the front surface of the upper table 24, and the upper die holder 38 is provided between the laterally adjacent projecting pieces 32 on the front surface of the mounting base 28. That is, the upper die holder 38 is attached to the lower end side of the front surface of the upper table 24 via the attachment base 28. The mounting surface of the upper die holder 38 is the front surface of the mounting base 28, and the mounting reference surface of the upper die holder 38 in the front-rear direction is the machined surface 24f on the lower end side of the front surface of the upper table 24.

In the present embodiment, the coupling member 64 is attached to the back surface of each projecting piece 32 of the attachment base 28, and the upper guide member 70 is integrally coupled to the front end surface of the coupling member 64. That is, the upper guide member 70 is attached to the lower end side of the front surface of the upper table 24 via the connecting member 64 and the attachment base 28. Since the attachment surface of the upper guide member 70 is the front end surface of the coupling member 64, the attachment reference surface of the upper guide member 70 in the front-rear direction is the machined surface 24f on the lower end side of the front surface of the upper table 24 via the coupling member 64.

Therefore, according to the present embodiment, the mounting reference surface of the common upper die holder and the mounting reference surface of the upper guide member can be made the same. Further, according to the present embodiment, even when the upper die exchanging unit 74 as a movable body is attached to the one-piece plate bending machine 10, it is possible to maintain the parallelism of the upper guide member 70 with respect to the upper die holder 38 with high accuracy, and to sufficiently ensure the reliability of the exchanging operation of the upper die exchanging unit 74.

In the present embodiment, the projecting pieces 32 (first regulating members) are provided on both the left and right sides of the attachment plate 40 on the front surface of the upper table 24. The upper die holder 38 on the lower end side of the upper table 24 is provided with connecting members 64 (second regulating members) on both the left and right sides thereof. Therefore, even if the bending load increases the deflection of the upper table 24 and the lower table 22 during the bending of the workpiece W, the lateral displacement of the upper die holder 38 relative to the upper table 24 can be restricted (prevented) by the projecting piece 32 and the connecting member 64. As a result, the reliability of the replacement operation of the upper die replacement unit 74 can be ensured more sufficiently. Further, interference between the lateral flange Wf and the upper die holder 38 and the like can be avoided, and bending failure can be prevented, so that bending can be performed with high accuracy and stability.

(second embodiment)

As shown in fig. 7 to 9, a plate bender 88 according to a second embodiment is a processing machine that bends a plate-shaped workpiece (metal plate) W by cooperation of an upper die 12 and a lower die 14. In the present embodiment, the locking hole 12h is formed in the upper mold 12 (see fig. 2), but the locking hole 12h may be formed. The locking hole 14h is not formed in the lower die 14 (see fig. 2), but the locking hole 14h may be formed.

The plate bender 88 has the same structure as the plate bender 10 (see fig. 1) except that the ATC60 (see fig. 1) is not mounted. Only the structure of the plate bender 88 which is different from the structure of the plate bender 10 will be described below. Note that, structural elements of the plate bender 88 corresponding to those of the plate bender 10 are denoted by the same reference numerals, and detailed description thereof is omitted.

The lower end surface of each projecting piece (projecting portion) 32 of the mounting base 28 is located above the lower end surface of the upper table 24. The coupling member 64 is not provided on the back surface of the projecting piece 32 (see fig. 5). The projecting piece 32 is a regulating member that regulates the lateral displacement (lateral displacement) of the upper die holder 38 by contacting the side surface of the mounting plate 40. That is, the projecting pieces 32 (restricting members) are provided on both the left and right sides of each mounting plate 40 on the front surface of the upper table 24. The lower end surface of the projecting piece 32 may be located at the same height as the lower end surface of the upper table 24, instead of being located above the lower end surface of the upper table 24.

The upper die holder 38 has a mechanical type structure disclosed in patent document 5, for example. The lower die holder 58 has a mechanical type structure disclosed in patent document 6, for example.

Next, the effects of the present embodiment will be explained.

The projecting pieces 32 (restricting members) are provided on both left and right sides of each mounting plate 40 on the front surface of the upper table 24. Therefore, even if the bending load increases the deflection of the upper table 24 and the lower table 22 during the bending of the workpiece W, the projecting pieces 32 can restrict (prevent) the lateral displacement of the upper die holder 38 with respect to the upper table 24. As a result, interference between the lateral flange Wf and the upper die holder 38 and the like can be avoided, and bending failure can be prevented, so that the workpiece W can be bent with high accuracy and stability.

Further, since the lower end surface of the projecting piece 32 is located above the lower end surface of the upper table 24, the height of the lateral flange Wf is not restricted by the projecting piece 32 as a restricting member, and the degree of freedom in bending the workpiece W can be sufficiently secured. That is, the bending of the workpiece W can be performed with high accuracy and stability while sufficiently ensuring the degree of freedom of the bending of the workpiece W. Even if the lower end surface of the projecting piece 32 is located at the same height as the lower end surface of the upper table 24, the degree of freedom of the bending process can be sufficiently secured. If the lower end surface of the projecting piece 32 is located below the lower end surface of the upper table 24, the degree of freedom of bending cannot be secured.

(modification 1)

As shown in fig. 10 and 11, a plate bender 88A according to modification 1 of the second embodiment has the same configuration as the plate bender 88 (see fig. 8). Only the structure of the plate bender 88A different from the plate bender 88 will be described below. The components of the plate bender 88A corresponding to the components of the plate bender 88 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the structure of the plate bender 88A, the mounting base 28 (see fig. 8) is omitted. A plurality of fixing metal fittings 34 are attached to the lower end side of the front surface of the upper table 24 at intervals in the left-right direction by attachment bolts 36. The fixed metal fitting 34 is directly fixed to the front surface of the upper table 24. (the upper portion of the fixing metal fitting 34 is thickened by an amount corresponding to the thickness of the mounting base 28.)

Rectangular plate-shaped regulating members 90 are attached to both left and right sides of each upper die holder 38 on the front surface of the upper table 24 by attachment bolts 92. The regulating member 90 regulates the lateral displacement (lateral displacement) of the upper die holder 38 by contacting the side surface of the mounting plate 40. The lower end surface of the regulating member 90 is located above the lower end surface of the upper table 24. The lower end surface of the regulating member 90 may be located at the same height as the lower end surface of the upper table 24, instead of being located above the lower end surface of the upper table 24.

Next, the effects of the present modification will be described.

The regulating members 90 are provided on the right and left sides of each upper mold holder 38 on the front surface of the upper table 24, respectively. Therefore, even if the bending load increases the deflection of the upper table 24 and the lower table 22 during the bending of the workpiece W, the restricting member 90 can restrict the lateral displacement of the upper die holder 38 with respect to the upper table 24. As a result, interference between the lateral flange Wf and the upper die holder 38 and the like can be avoided, and bending failure can be prevented, so that the workpiece W can be bent with high accuracy and stability.

Further, since the lower end surface of the regulating member 90 is positioned above the lower end surface of the upper table 24, the height of the lateral flange Wf is not limited by the regulating member 90, and the degree of freedom in bending the workpiece W can be sufficiently ensured. That is, as in the second embodiment, the bending of the workpiece W can be performed with high accuracy and stability while sufficiently ensuring the degree of freedom of the bending of the workpiece W. Even if the lower end surface of the regulating member 90 is located at the same height as the lower end surface of the upper table 24, the degree of freedom of the bending process can be sufficiently secured. If the lower end surface of the regulating member 90 is located below the lower end surface of the upper table 24, the degree of freedom of the bending process cannot be secured.

(modification 2)

As shown in fig. 12 and 13, a plate bender 88B according to modification 2 of the second embodiment has the same configuration as the plate bender 88 (see fig. 8). Only the structure of the plate bender 88B different from the plate bender 88 will be described below. The components of the plate bender 88B corresponding to the components of the plate bender 88 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the structure of the plate bender 88B, the mounting base 28 (see fig. 8) is omitted. A plurality of fixing metal fittings 34 are attached to the lower end side of the front surface of the upper table 24 at intervals in the left-right direction by attachment bolts 36. The fixed metal fitting 34 is directly fixed to the front surface of the upper table 24. (the upper portion of the fixing metal fitting 34 is thickened by an amount corresponding to the thickness of the mounting base 28.)

L-shaped regulating members 94 are attached to both left and right sides of each upper die holder 38 on the lower end side of the back surface of the upper table 24 by mounting bolts 96. The regulating member 94 is in contact with the side surface of the wedge member 44 to regulate the lateral displacement (lateral displacement) of the upper die holder 38. The regulating member 94 includes a vertical portion 94a fixed to the rear surface of the upper table 24 by a mounting bolt 96, and a horizontal portion 94b protruding forward from the lower end of the vertical portion 94 a. The front surface (front surface) of the horizontal portion 94b of the regulating member 94 is located on the rear side of the pressing center position BL.

Next, the operation and effect of this modification will be described.

The regulating members 94 are provided on the left and right sides of each upper die holder 38 on the lower end side of the back surface of the upper table 24. Therefore, even if the deflection of the upper table 24 and the lower table 22 is increased by the distortion load when the workpiece W is bent, the lateral displacement of the upper die holder 38 with respect to the upper table 24 can be restricted by the restricting member 94. As a result, interference between the lateral flange Wf and the upper die holder 38 and the like can be avoided, and bending failure can be prevented, so that the workpiece W can be bent with high accuracy and stability.

Further, since the front surface of the horizontal portion 94b of the regulating member 94 is located on the rear side of the pressing center position BL, the height of the lateral flange Wf is not limited by the regulating member 94, and the degree of freedom in bending the workpiece W can be sufficiently ensured. That is, as in the second embodiment, the bending of the workpiece W can be performed with high accuracy and stability while sufficiently ensuring the degree of freedom of the bending of the workpiece W.

The entire contents of the Japanese patent application Nos. 2019-87437 (application No. 5/7/2019) and 2020-71715 (application No. 4/13/2020) are hereby incorporated by reference into the present specification. The present invention has been described above with reference to the embodiments of the present invention, but the present invention is not limited to the above embodiments. For example, a monitoring camera or a bending indicator (bend angle detector) can be used as the moving body. The scope of the invention is to be determined with reference to the claims.