JP2010284715A - Lower die device for press brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lower die device 106 for press brakes, which pinch a pair of side-face parts in the longitudinal direction c1 to clamp them even when it is a lower die 103A which is short in the dimension of the longitudinal direction c2 to facilitate attachment and detachment of the lower die. <P>SOLUTION: The lower die device 106 for the press brakes which clamps the lower die with a first holder member 112A and a second holder member 113A is configured such that: a linking member 3 is inserted into each of the through-holes g2 of the first holder member; one end of the linking member is engaged with the second holder member through a first elastic member 5 and a slide-contacting part 3c is formed on the other end; a sliding bar 2 on which an inclined surface part j1 which is pressure-contacted with the respective slide-contacting parts is formed on the rear face f2 of the first holder member is mounted; the sliding bar is linked and connected to an input member 4 which is rotatably mounted on the first holder member through a pinion and rack mechanism jm; a second elastic member 6 is annexed on the rear face f20 of a second holder member; and the lower die is sandwiched through the suppressing force of the first and second elastic members when the input member is rotationally operated to the clamping position. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a press brake lower mold device for fixing a die as a lower mold to a lower table of a press brake.

  As a press brake for bending a plate-shaped workpiece, for example, one shown in FIG. 8 is known (Patent Document 1).

  This press brake has a die 101 as an upper die fixed to the upper table (ram member) 100 and a die 103 as a lower die fixed to the lower table 102. The lower end of the upper die 101, The plate-like workpiece w is processed by engaging the groove a1 having a V-shaped cross section formed on the upper surface of the mold 103.

  The upper table 100 is moved up and down by a driving device (not shown), and the upper mold 101 is fixed to the upper table 100 via a clamp 104, an intermediate plate 105, and the like. The lower die 103 forms a lower die device 106 together with the lower die holder portion 107 to which the lower die 103 is fixed. The lower die holder portion 107 is attached to the lower table 102 via a clamp 108 and a bolt 109. The lower die 103 is attached to the lower die holder portion 107 by a drooping tightening portion comprising a vertical bolt 110a threaded onto the lower surface of the lower die 103 and a nut 110b threaded onto the bolt 110a. 110 is fitted into the notch b1 of the lower mold holder 107 and then the nut 110b is tightened. In FIG. 1, c1 indicates the front-rear direction of the press brake, and c2 indicates the left-right direction.

  On the other hand, in order to perform a bending process on a small plate-like workpiece w, a new mold lower device 106 as shown in FIG. 10 is put into practical use.

  FIG. 9 shows the lower mold device 106, A is a front view, and B is a cross-sectional view showing a portion x01-x01. The lower mold holder portion 107 used in the lower mold apparatus 106 includes a first holder member 112 fixed with a bolt on a holder base 111 fixed to the lower table 102, and a front surface of the first holder member 112. The second holder member 113 is opposed to and abutted with the second holder member 113. The first holder member 112 includes a horizontal surface portion d1 that supports the lower surface of the lower mold 103A and a vertical surface portion d2 that is in close contact with one side surface portion e1 orthogonal to the front-rear direction c1 among the leg portions e0 of the lower mold 103A. The dimension in the longitudinal direction c2 is about 800 mm. The second holder member 113 has a belt plate shape and includes a vertical surface portion d3 that is in close contact with the other side surface portion e2 orthogonal to the front-rear direction c1 of the leg portion e0 of the lower mold 103A. A plurality of second holder members 113 are arranged in a line in the longitudinal direction c2 of the first holder member 112. The first holder member 112 is formed with a large number of screw holes d4 spaced apart in the longitudinal direction c2, and the second holder member 113 has slits d5 at positions corresponding to the screw holes d4. The bolts 114 that are formed and inserted through the slits d5 are screwed into the corresponding screw holes d4 to fix the second holder member 113 to the first holder member 112. The holder base 111 is fixed to the lower table 102 with a clamp 108 and a bolt 109 in FIG.

  The lower mold 103A held by the lower mold holder 107 has a longest length of 835 mm and a shortest length of 10 mm. As an intermediate length, 400 mm, 200 mm, 100 mm, 50 mm, 40 mm, 20 mm, and 15 mm are prepared.

  Further, in order to obtain a tightening force in which the bending due to the material of the second holder member 113 does not affect the holding of the lower mold 103A, the distance between the adjacent screw holes d4 and d4 is set at a constant interval. Two or more second holder members 113 are provided. As a result, when replacing the lower mold 103A, it is necessary to tighten or loosen a large number of bolts 114, which requires a lot of labor.

Japanese Utility Model Publication No. 7-26010

  The present invention clamps the pair of side surfaces e1 and e2 of the lower mold 103A so as to sandwich the lower mold 103A as in the case of the lower mold device 106 of the novel form described above, and facilitates the attachment and detachment of the lower mold 103A. An object of the present invention is to provide a lower mold device for a press brake that can be made to operate.

    In order to achieve the above object, a press brake lower mold apparatus according to the present invention includes a first holder member fixed to a lower table with a pair of side surfaces opposed to each other in the front-rear direction of a lower mold leg, and the first holder member. 1. A lower mold apparatus for clamping a lower mold so as to be clamped by a second holder member facing a front surface of one holder member and held so as to be displaceable in the front-rear direction, wherein the first holder member includes the front-rear direction Front and rear through-holes are formed at a plurality of positions on the horizontal longitudinal direction orthogonal to each other, and a linking member is inserted into each of the through-holes. One end of the linking member is connected to the second holder member. A slidable contact portion is formed at the other end of the first holder member, which is engaged with the elastic member and spaced rearward from the rear surface of the first holder member. The rear surface of the first holder member extends in the longitudinal direction. Each of the sliding contact portions is movably engaged A sliding rod having an inclined surface portion that is pressed by the elasticity of the first elastic member is installed, and the sliding rod is installed on the first holder member so as to be rotatable about a front-rear direction line. The input member is interlocked and connected via a pinion rack mechanism, and a second elastic member is attached to the rear surface portion of the second holder member. The leg portion is configured to be clamped via the elastic pressure of the first elastic member and the second elastic member.

  According to the present invention, when one input member is rotated from the unclamp side to the clamp side within a range of, for example, less than one rotation, via the wedge action by the inclined surface portion and the sliding contact portion of the slide bar. As a result of the plurality of linkage members being displaced rearward in synchronization and the first holder member and the second holder member being brought close to each other, the lower leg portion is subjected to the elastic pressure of the first elastic member and the second elastic member. Conversely, when one input member is rotated from the clamp side to the unclamp side, a plurality of linkage members are connected via the wedge action by the inclined surface portion and the sliding contact portion of the sliding rod. Are synchronously displaced forward and the first holder member and the second holder member are separated from each other. As a result, the lower mold leg portion is released from the pinching force caused by the elastic pressure of the first elastic member and the second elastic member. It becomes like this.

  Accordingly, the lower mold can be clamped and fixed to the lower table or unclamped to be removable by relatively little effort of rotating one input member around the front-rear direction line. With this, it is possible to efficiently and highly accurately produce a large variety of small quantities.

It is a perspective view which shows the use condition of the lower die apparatus for press brakes which is one Example of this invention. The lower mold part of the lower mold apparatus is shown in which A is a front view, B is a plan view, C is a sectional view of x1-x1 part, and D is a sectional view of x2-x2 part. A combined body of a holder base and a first holder member, which is a part of the lower mold holder portion, is shown in FIG. A is a front view, B is a plan view, and C is a sectional view of x3-x3 portion. The 2nd holder member which is a part of the said lower mold | type holder part is shown, A is a front view, B is a top view, C is a side view. The sliding rod which is a part of the lower mold holder portion is shown. A is a front view, B is a plan view, and C is a side view. The link member which is a part of the lower mold holder part is shown, A is a plan view, and B is a side view. The input member which is a part of the said lower mold | type holder part is shown, A is a top view, B is a side view. It is a perspective view which shows the conventional press brake. The conventional lower mold | type apparatus is shown, A is a front view, B is sectional drawing which shows x4-x4 part.

  Embodiments of the present invention will be described in detail with reference to the following examples.

  FIG. 1 is a perspective view showing a part of a press brake used in a lower mold device 106 for a press brake according to an embodiment of the present invention, and FIG. 2 is a lower mold holder portion which is a part of the lower mold device 106. 107 is a front view, B is a plan view, C is a cross-sectional view of the x1-x1 portion, and D is a cross-sectional view of the x2-x2 portion.

  As shown in FIGS. 1 and 2, the press brake lower mold device 106 of the present embodiment includes a lower mold 103A similar to the conventional one and a lower mold holder portion 107 having a novel structure. The lower mold holder 107 includes a holder base 111 that is fixed to the lower table 102 of the press brake through a clamp 108 and a bolt 109 in the same manner as in the past in the longitudinal direction in the left-right direction c2, and an upper surface of the holder base 111. The first holder member 112A is fixed to the first holder member 112A through the vertically oriented bolt 1, and the second holder member 113A is opposed to the front surface f1 of the first holder member 112A.

  Reference numeral 2 denotes a sliding bar disposed on the first holder member 112A so as to be slidable in the left-right direction c2. Reference numeral 3 denotes a first gap between the first holder member 112A and the sliding bar 2 in the longitudinal direction c2. 4 is an input member that is rotatably mounted around a longitudinal line in the longitudinal direction c2 of the first holder member 112A, and 5 is a first elastic member (seat spring). 6 is a second elastic member.

Each part will be described in more detail.
3A and 3B show a combined body of the holder base 111 and the first holder member 112A, where A is a front view, B is a plan view, and C is a cross-sectional view of the x3-x3 portion.

  The first holder member 112A has a straight groove g1 having a quadrangular cross-section in the entire length range of the upper portion of the front surface f1, and a through-hole in the front-rear direction c1 at a predetermined interval in the longitudinal direction c2 of the bottom surface g01 of the straight groove g1. g2 is formed. A stepped through hole g3 in the front-rear direction c1 is formed in the vicinity of the lower side of the straight groove g1 at one place in the middle of the longitudinal direction c2. In addition, a long long through hole g4 extending in the longitudinal direction c2 is formed at an intermediate position in the width direction c1 on the lower side of the straight groove g1, and the lower central portion of the long through hole g4 is opened downward. The opened opening g04 is formed over the entire width in the front-rear direction c1. And bottomed holes g5 drilled in the front-rear direction c1 are formed at a plurality of spaced locations on the longitudinal direction c2 of the upper part of the rear surface f2 of the first holder member 112A, and further on the upper part of the first holder member 112A. As in the prior art, a horizontal surface portion d1 and a vertical surface portion d2 are formed.

  The first holder member 112A is disposed at the center of the width of the upper surface of the holder base 111, the head 1a of the bolt 1 is disposed in each long through hole g4, and the shaft 1b passes through the opening g04. It is screwed into the screw hole h <b> 1 of the holder base 111 and is fixed in the same shape as the holder base 111 by fastening the bolt 1. By loosening and fastening the bolt 1, the position of the first holder member 112 </ b> A in the front-rear direction c <b> 1 with respect to the holder base 111 can be adjusted.

  4A and 4B show the second holder member 113A and the second elastic member 6, where A is a front view, B is a plan view, and C is a side view.

  The second holder member 113A has a rear surface upper part i1 that is a part of a vertical surface part d3 that faces the vertical surface part d2 of the first holder member 112A. A straight groove i01 having a quadrangular shape is formed. A rear surface intermediate range i3 between the lower rear surface i2 and the upper rear surface i1 is in a slightly recessed state. Further, a stepped through hole i4 in the front-rear direction c1 is formed at a constant interval position in the longitudinal direction c2 at a substantially central height of the rear surface intermediate range portion i3, and the first holder is formed below each second holder member 113A. A notch portion i5 having a lower edge opened is formed at a position corresponding to the long through hole g4 of the member 112A.

  The second holder member 113A shown in FIG. 4 is disposed adjacent to the left side of the input member 4 in FIG. 2 when viewed from the front. Therefore, in order to avoid interference with the input member 4 at the lower portion of the right edge in the front view. The notch i6 is formed. Further, the second holder member 113A arranged adjacent to the right side of the input member 4 in the front view is formed with a notch for avoiding interference with the input member 4 at the lower portion of the left edge in the front view. The two second holder members 113A do not need and are not formed with a notch corresponding to the notch i6.

  The second elastic member 6 is fitted in the straight groove i01 of each second holder member 113A. The second elastic member 6 is a linear body made of a solid rubber material, and protrudes rearward from the rear surface f20 of the upper portion of the second holder member 113A by 0.2 mm.

5 is a front view, B is a plan view, and C is a side view.
As shown also in FIG. 5, the sliding rod 2 has a quadrangular cross section and a length substantially matching the first holder member 112A, and the first holder member 112A has a through-hole in a constant interval range in the longitudinal direction c2. An inclined surface portion j1 is formed in which the front surface corresponding to g2 is raised on the right side when viewed from the front, and a straight elongated through hole j2 is formed at the center of the height of each inclined surface portion j1, and The range between the adjacent inclined surface portions j2 and j2 is a constant-thickness plate portion j3 protruding to the front c101, the left and right end edges of the full length range are the protrusions j4 protruding forward, and the input member 4 A rack portion j5 is formed at the lower edge of one equal thickness plate portion j3 positioned directly above. At this time, the inclination angle of the rear surface j6 of the inclined surface portion j1 with respect to the vertical surface along the left-right direction c2 is set within a range of, for example, 1.2 degrees to 2.0 degrees. If this inclination angle is smaller than this range, the required amount of movement of the sliding bar 2 in the left-right direction becomes large, and conversely if it is larger than this range, it is suitable for the front c101 acting on the sliding bar 2. The position holding property of the sliding bar 2 due to the frictional force generated between the connecting member 3 and the external force is impaired.

  6A and 6B show the link member 3 and the first elastic member 5 fitted on the link member A. FIG. 6A is a plan view and FIG. 6B is a side view.

  As shown in FIG. 6, the linking member 3 includes a shaft member 3 </ b> A, a nut 3 </ b> B, and a pin member 3 </ b> C that functions as a sliding contact portion. The shaft member 3A has a straight rod shape, a male screw portion k1 to which a nut 3B is screwed in order from the front end, a cylindrical portion k2 having a smooth outer peripheral surface, and the upper and lower portions of the cylindrical body are cut off in a horizontal plane. The missing circle part k3 formed with k03 is formed concentrically. At this time, a vertical pin hole k04 is formed at a position slightly above the rear end of the missing circle part k3, and the pin member 3C is inserted into the pin hole k04. The pin member 3C is a cylindrical body that is slightly shorter than the vertical width of the straight groove g1 of the first holder member 112A.

  Further, the first elastic member 5 is a kind of leaf spring and is a disc spring whose outer diameter is substantially matched to that of the nut 3B. When the compression force in the front-rear direction c1 necessary for holding the lower mold 103A is applied, the first elastic member 5 The total length in the direction c1 is elastically deformed so as to be shortened by 0.5 mm.

FIG. 7 shows the input member 4, where A is a plan view and B is a side view.
As shown in FIG. 7, the input member 4 is a cylindrical body having a stepped outer peripheral surface, and a wrench fitting hole m2 into which a hexagon wrench T as an operation lever is fitted is formed on the front end surface m1. Annular grooves m3 and m4 are formed at positions near the ends of the front and rear direction c1 on the outer peripheral surface, and a cylindrical part m5 is formed between the front and rear annular grooves m3 and m4, and the rear annular groove m4 is formed. The pinion part m6 meshed with the rack part j5 of the sliding rod 2 is formed on the rear outer peripheral surface.

Next, the assembly structure of the lower mold holder 107 will be described.
The input member 4 is inserted into the stepped through hole g3 of the first holder member 112A, one annular groove m3 is positioned in the vicinity of the front side of the first holder member 112A, and the other annular groove m4 is the first holder member 112A. The stepped through hole g3 is positioned in the vicinity of the rear side of the stepped circular vertical surface g03. Under this state, an open locking ring (snap ring or the like) not shown is elastically attached to each of the annular grooves m3 and m4. Is done. Since the pair of open-type locking rings are positioned so as to sandwich the first holder member 112A densely, the input member 4 is only allowed to rotate about the front-rear direction line on the first holder member 112A. It becomes.

  Further, a shaft member 3A which is a part of the linkage member 3 is inserted into each through hole g2 of the first holder member 112A, and a notch portion k3 which is a rear end portion of the shaft member 3A is an elongated shape of the sliding rod 2. It is inserted into the through hole j2. In this state, the horizontal plane k03 of the missing circle portion 3A is held in a state along the longitudinal direction c2 of the first holder member 112A with the displacement around the front-rear direction line being restricted by the upper and lower side surfaces of the long through hole j2. The pin member 3C is inserted into a vertical pin hole k04 positioned at the rear c102 from the rear surface f21 of the sliding rod 2 before the sliding rod 2 is fitted into the straight groove g1 of the first holder member 112A. While this state is maintained, the sliding rod 2 is fitted into the straight groove g1, and the rack part j5 is meshed with the pinion part m6 of the input member 4 at the time of fitting. When the sliding rod 2 is fitted in the normal position shown in FIG. 2, the pin member 3C is also positioned in the straight groove g1, and its vertical displacement is restricted to the upper and lower side surfaces of the straight groove g1. Therefore, the escape from the pin hole k04 is regulated without providing any special retaining means.

  On the other hand, a spring (not shown) whose free length is larger than the length c1 of the bottomed hole g5 in the bottomed hole g5 of the first holder member 112A is installed in the front-rear direction, while maintaining this state, The through hole i4 of the second holder member 113A corresponding to the front end portion of the member 3A is externally fitted. As a result, the second holder member 113A is in a state of being supported and brought close to the first holder member 112A via the cylindrical portion k2 of each shaft member 3A so as to be displaceable in the front-rear direction c1. Under this state, the disc spring which is the first elastic member 5 is externally fitted from the front of the shaft member 3A, and the nut 3B is screwed into the male screw portion k1. As a result, the disc spring 5 is pressed against the nut 3B in the large-diameter portion i04, which is the front portion of the through hole i4, and comes into contact with the front surface f10 side of the second holder member 113A, and the spring is pressed against the nut 3B. Thus, the second holder member 113A is pressed and compressed on the rear surface f20. At this time, the second holder member 113A is held in a state slightly separated from the first holder member 112A by the elasticity of the spring, and the position of the nut 3B with respect to the male screw portion k1 is the position of the second holder member 113A. The disc spring from the time when the rear surface upper part i1 contacts the front side surface part of the leg of the die which is the lower mold 103A and the rear lower part i2 of the second holder member 113A contacts the front surface f1 of the first holder member 112A. 5 is determined so that the maximum elastic deformation amount in the front-rear direction c1 is 0.5 mm. And the relative position of the nut 3B and the external thread part k1 at this time is fixed via the appropriate locking member which is not shown in figure.

Next, a usage example of the above-described lower mold apparatus 106 and the operation of each unit will be described.
The die as the upper mold 101 is fixed in the same shape as the ram member 100 as in the prior art.
The lower mold device 106 is fixed to the lower table 102 as shown in FIG. 1. Under this condition, the main part of the hexagon wrench T, which is a detachable operation lever, is fitted with the wrench on the front end surface of the input member 4. The input member 4 is rotated and displaced to the unclamping position by fitting the hexagon wrench T counterclockwise around the front-rear direction line by fitting in the fitting hole m2. In the hexagon wrench T, the wrench fitting hole m2 (FIG. 7) is opened at a position behind the front surface of the second holder member 113A, and the hexagon wrench T can be removed from the wrench fitting hole m2. This will not interfere with the bending process.

  The rotational displacement of the input member 4 displaces the sliding rod 2 to the right on the first holder member 112A via the pinion rack mechanism jm formed by the engagement of the pinion part m6 and the rack part j5. The moving rod 2 is located at the unclamping position. At this time, each pin member 3C is relatively displaced to the left end position, which is the position where the thickness in the front-rear direction is the smallest, in the left-right range of the corresponding inclined surface portion j1, and at this time, the disc spring 5 The spring deformation (not shown) in the bottomed hole g5 pushes and displaces the second holder member 113A to the front c01 by its own elasticity and slightly separates it from the first holder member 112A.

  In this state, the die leg as the lower mold 103A necessary for bending is inserted between the vertical surface portion d2 of the first holder member 112A and the vertical surface portion d3 of the second holder member 113A, and the lower surface of the die 103A is the first. The holder member 112A is brought into close contact with the horizontal surface part d1. At this time, since the pair of opposed vertical surface portions d2 and d3 are in a state of being separated as much as possible, the insertion process of the die 103A can be easily performed. The die 103A generally has a lateral length that substantially matches the lateral width of the plate-like workpiece w to be bent. At this time, the die 103A is prepared in various left and right lengths arbitrarily determined in advance.

  Thereafter, the hexagon wrench T is swung clockwise as opposed to the front, and the input member 4 is rotated and displaced toward the clamp position around the front-rear direction line. As a result, the sliding bar 2 is displaced in the left direction c201 on the first holder member 112A via the pinion rack mechanism jm. In relation to this, each pin member 3C is on the horizontal range of the corresponding inclined surface portion j1. Thus, the thickness is relatively displaced toward the side where the thickness in the front-rear direction gradually increases. In this relative displacement process, the linking member 3 is displaced to the rear c102 by the wedge action of the inclined surface portion j1 and the pin member 3C, and the second holder member 113A is displaced so as to be close to the first holder member 112A.

  As described above, the maximum elastic deformation amount of the first elastic member 5 in the front-rear direction c1 is 0.5 mm. On the other hand, the second elastic member 6 is in a state where it protrudes rearward from the rear surface f20 of the upper portion of the second holder member 113A by 0.2 mm, and the maximum elastic deformation amount is 0.2 mm. When both are added together, a total deformation of 0.7 mm can be allowed. The unclamping position and the clamping position of the sliding rod 2 are set to be slightly larger than 0.7 mm, which is for inserting the lower mold 103A at the unclamping position.

  When the sliding member 2 is in the clamping position, the pin member 3C is pressed to the front c101 on the inclined surface part j1 by the clamping force, and this pin member 3C is a forward reaction force applied to the inclined surface part j1. The pressing force generates a first component force that moves the pin member 3C along the inclination direction of the inclined surface portion j1, but at the same time, a frictional resistance force that is opposite to the first component force and greater than the first component force is generated. . As a result, the pin member 3C performs a self-locking function in a free state where no external force is applied when the lower mold holder portion 107 clamps the leg portion of the die 103A, and the plate work w is repeatedly bent. Even in this case, the loose displacement of the pin member 3C is prevented, and the clamping force does not drop carelessly.

  In a state where the die 103A is fastened, when the core of the die 103A does not match the die which is the upper die 101, the bolt 1 is loosened and the first holder member 112A is moved back and forth on the holder base 111. After adjusting the alignment of the die 101 and the die 103A, the bolt 1 is tightened again. The vertical opening g04 allows the first holder member 112A on the holder base 111 to be moved back and forth, thereby adjusting the alignment.

  When the die 103A clamped by the lower mold holder 107 is removed, the reverse procedure for clamping the die 103A may be executed. Further, the hexagon wrench T is removed from the input member 4 during bending of the plate-like workpiece w by the press brake, so that the work is not disturbed.

  In such a clamped state of the die 103A by the lower mold holder portion 107, the linkage members 3 are arranged at a relatively short interval in the left-right direction c2, and each second holder member 113A is compared with the first holder member 112A. Since the length is a fraction of the length, the die 103A can be stably clamped with the necessary clamping force even if the short die 103A is clamped alone or at intervals. Also, since the die 103A is clamped by directly pressing the second elastic member 6 made of a rubber material linear body against the front side surface portion of the leg portion of the die 103A, a plurality of dies 103A having a relatively short length are used. Are simultaneously clamped, each die 103A can be clamped with a necessary clamping force even if there is a manufacturing dimensional difference due to tolerance at the leg of each die 103A. In this way, the dies 103A of various lengths can be easily and quickly exchanged and can be stably clamped, so that work efficiency and high accuracy can be achieved in high-mix low-volume production.

2 Sliding bar 3 Linking member 3A Shaft member 3B Nut 3C Sliding contact part (pin member)
5 First elastic member 6 Second elastic member 102 Lower table 103A Lower mold 106 Lower mold device 112A First holder member 113A Second holder member c1 Longitudinal direction c2 Longitudinal direction e1 Side surface portion e2 Side surface portion f1 Front surface f2 Rear surface f20 Rear surface g1 Direct Groove g2 Through hole i1 Groove j1 Inclined surface part j2 Elongate through hole jm Pinion rack mechanism k3 Missing circle part k03 Horizontal plane k04 Pin hole

Claims (4)

The first holder member fixed to the lower table and the second holder member that faces the front surface of the first holder member and is held so as to be displaceable in the front-rear direction. Mold device,
The first holder member has front and rear through holes formed at a plurality of positions in a horizontal longitudinal direction orthogonal to the front and rear direction, and a link member is inserted into each of the through holes, and the link member has one end. And a sliding contact portion is formed at the other end portion away from the rear surface of the first holder member. On the rear surface of the holder member, there is provided a slide bar which is slidably engaged in the longitudinal direction and formed with an inclined surface part with respect to each of the sliding contact parts. A pinion rack mechanism is connected to an input member rotatably mounted around the front-rear direction line, and a second elastic member is provided on the clamping surface of the second holder member that clamps the lower mold leg. A member is attached, and the input member is at the clamping position. When dynamic operation, the legs lower die device for press brake, characterized in that it is clamped via the suppression force of the first elastic pressure member and the second elastic member.   Each of the inclined surface portions is formed with an elongated through hole elongated in the longitudinal direction. On the other hand, each of the linking members is formed with a missing circle portion having a horizontal surface, and each missing circle portion has the corresponding length. 2. The press die lower brake device according to claim 1, wherein the press brake lower die device is inserted in a rotation restricting state around a front-rear direction line by interference with the horizontal plane.   The sliding rod is closely fitted in a straight groove formed along the longitudinal direction on the rear surface of the first holder member, while the sliding contact portion is formed in the notch portion. The pin member is formed by a pin member inserted through a vertically oriented pin hole, and each end of the pin member is opposed to the upper and lower side surfaces of the straight groove. 3. The lower mold apparatus for press brake according to claim 2, wherein slip-out is restricted.   The press die lower mold apparatus according to claim 1, wherein the input member has a fitting hole for fitting with a detachable lever, and is rotated around the front-rear direction line by the lever.