JP6148883B2 - Press brake - Google Patents

Description

  The present invention relates to a press brake. More specifically, the present invention relates to a press brake having a front plate and a rear plate on the front and rear sides of a lower table provided at the front lower portion of the left and right side frames, respectively. In particular, the present invention relates to a press brake provided with a work support device such as a follow-up device.

  The press brake includes a lower table at the front lower portion of the left and right side frames, and an upper table facing the lower table vertically at the upper front portion of the side frame. One of the upper and lower tables is provided as a ram so as to be movable up and down. When a plate-shaped workpiece is bent by the upper and lower molds provided in the upper and lower tables, the upper table tends to bend upward and the lower table is curved downward. There is a tendency.

  Accordingly, there is a press brake having a configuration including a crowning mechanism for bending the lower table in the same direction corresponding to the curvature of the upper table provided as a ram so as to be movable up and down (see, for example, Patent Document 1).

  Also, the press brake has a follow-up support device on the front side that supports the work following the rising of the work when the plate-like work is bent into a V shape by upper and lower molds. (See, for example, Patent Document 2).

JP 2002-248520 A Japanese Utility Model Publication No. 3-24313

  Each of the press brakes described in Patent Documents 1 includes a front plate and a rear plate on the front and rear of the lower table, and a crowning cylinder for bending the lower table upward is provided on the front plate and the rear plate. It is the structure supported by a board. When the follower device is provided in the press brake having such a configuration, the follower support device can be provided on the floor of the factory. However, the level of the floor is unstable and the follow-up support device may not be installed.

  Therefore, it is possible to make a hole in the front plate and support the follow-up support device by the lower table. However, in this case, misalignment between the upper table and the lower table may occur due to the load of the follow-up support device. Moreover, when it is set as the structure which supports a tracking support apparatus with the said front board, a front board may incline in the front-back direction with the load of the said tracking support apparatus.

The present invention has been made in view of the problems as described above, and includes a lower table at the front lower portion of the left and right side frames, an upper table at the front upper portion of the side frame, and a vertically movable table. It is a press brake having front and rear plates respectively on the front and rear, and a work support device for supporting a work to be bent is provided on the front side of the front plate, and the front plate is provided with the weight of the work support device. In order to regulate the inclination, the front plate and the rear plate are provided with an upper and lower interval holding member for always holding the upper side interval and the lower side interval constant, and the lower side interval holding member is It is comprised from the push bolt which has a function which adjusts the space | interval of the lower part side of a board and a rear board, It is characterized by the above-mentioned.

  Further, in the press brake, an upper side interval holding member for constantly maintaining an upper side interval between the front plate and the rear plate penetrates the lower table in the front-rear direction and the front plate and the rear plate. Are connected to the front plate and the rear plate in order to restrict the upper side from separating, and a plurality of them are provided at appropriate intervals in the left-right direction.

  Further, in the press brake, a lower interval holding member for constantly maintaining a lower interval between the front plate and the rear plate regulates that the lower side of the front plate and the rear plate are close to each other. Therefore, a plurality of them are provided between the front plate and the rear plate, and a plurality of them are provided at appropriate intervals in the left-right direction.

Further, a press brake having a lower table at the front lower part of the left and right side frames, an upper table being movable up and down at the front upper part of the side frame, and a front plate and a rear plate at the front and rear of the lower table, respectively. A work support device for supporting a workpiece to be bent is provided on the front side of the front plate, and the front plate and the rear plate are controlled by regulating the inclination of the front plate due to the weight of the work support device. a plurality of spacing members for holding the gap constant at all times, at the bottom side of the front plate and the rear plate, and provided with the appropriate spacing in the lateral direction between the left and right side frames, the distance holding The member is composed of a push bolt having a function of adjusting the distance between the lower side of the front plate and the rear plate .

  According to the present invention, the interval holding member is provided to always keep the interval between the front plate and the rear plate provided before and after the lower table constant. Therefore, even when the work support device is provided on the front plate, the inclination of the front plate can be restricted, and the problems described above can be solved.

FIG. 5 is a perspective explanatory view showing the configuration of the main part on the lower side, omitting the upper side in the press brake according to the embodiment of the present invention. It is side sectional explanatory drawing which shows the structure of the principal part of the press brake which concerns on embodiment of this invention.

  Hereinafter, a press brake according to an embodiment of the present invention will be described with reference to the drawings. The overall configuration of the press brake is already well known. Therefore, description of the overall configuration of the press brake will be omitted, and the configuration of the main part will be described.

  Referring to FIG. 1, a press brake 1 according to an embodiment of the present invention includes left and right side frames 3 </ b> L and 3 </ b> R similarly to a conventional general press brake. The left and right side portions of the lower table 5 that are long in the left-right direction (X-axis direction) are supported at the front lower portions of the side frames 3L, 3R. The configuration in which the left and right side portions of the lower table 5 are supported by the left and right side frames 3L and 3R is a well-known configuration as described in Patent Document 1. Therefore, the detailed description about the support structure of the lower table 5 by the side frames 3L and 3R is abbreviate | omitted. Similar to a general press brake, an upper table (not shown) that is vertically opposed to the lower table 5 is provided on the front upper portions (not shown) of the side frames 3L, 3R so as to be movable up and down as a ram. Yes.

  A front plate 7 is disposed on the front side of the lower table 5, and a rear plate 9 is disposed on the rear side. That is, the lower table 5 is sandwiched between the front plate 7 and the rear plate 9. The left and right side portions of the front plate 7 and the rear plate 9 are connected to each other by a shaft (not shown) penetrating the front plate 7, the lower table 5, and the rear plate 9, as in the conventional configuration. It is. The shaft is provided at a position corresponding to the left and right side plates 3L, 3R.

  In addition, the press brake 1 is provided with a crowning mechanism for bending the lower table 5 upwardly in a convex manner, like the conventional press brake. That is, a cylinder mounting portion (mounting hole) 13 for mounting the crowning cylinder 11 is provided at an appropriate position of the front plate 7 and the rear plate 9. The lower table 5 is provided at a position corresponding to the cylinder mounting portion 13 with a pressed portion that is pressed upward by a piston rod (not shown) provided on the crowning cylinder 11 so as to be movable up and down. Yes.

  With the above configuration, the plate-like workpiece (not shown) can be bent by the upper and lower molds (not shown) provided in the upper table and the lower table 5. When the workpiece is bent, the lower table 5 can be curved in a convex shape upward by operating the crowning cylinder 11 to press the lower table 5 upward.

  As described above, when the workpiece is bent by the upper and lower molds, the workpiece support device (following support device) 15 that supports the workpiece following the bending of the workpiece is provided on the front surface of the front plate 7. Yes.

  More specifically, a guide base 17 that is long in the left-right direction is integrally attached to the front upper side of the front plate 7, and a guide member 19 such as an LM guide is provided in the left-right direction on the guide base 17. Long equipped. A guide base 21 that is long in the left-right direction is integrally attached to the front lower side of the front plate 7. The guide member 19 and the guide base 21 support the left and right workpiece support devices 15 so that they can be moved and positioned in the left-right direction.

  The left and right workpiece support devices 15 have the same or symmetrical configuration. Therefore, only the configuration of one work support device 15 will be schematically described. In the other work support device 15, the same reference numerals are given to components having the same function, and redundant description is omitted.

  The work support device 15 is provided with a left / right slide base 23 that is movable in the left / right direction. A guided member 25 guided by the guide member 19 is provided on the rear surface of the upper side of the left and right slide base 23. A roller 27 that is movable in the left-right direction on the front surface of the guide base 21 is rotatably provided on the rear surface of the lower side of the left-right slide base 23. The left and right slide base 23 is moved and positioned in the left and right direction by operating a servo motor (not shown) provided on the left and right slide base 23 to operate a servo drive mechanism (not shown) such as a rack and pinion mechanism or a ball screw mechanism. Is carried out by driving.

  A vertical guide member 29 is provided on the front surface of the left and right slide base 23. An upper and lower slide frame 31 is guided and supported by the guide member 29 so as to be movable up and down. In this vertical slide frame 31, a work support plate 33 for supporting the work to be bent is rotated in the vertical direction around the shoulder of the V groove in the die (not shown) mounted on the lower table 5. It is possible.

  Note that the vertical movement of the vertical slide frame 31 and the vertical rotation of the work support plate 33 are performed by controlling the rotation of the corresponding servo motors (not shown). It is mine. As is well known, there are various configurations for rotating the workpiece support plate 33 in the vertical direction. For example, since the configuration described in Patent Document 2 can be adopted, the description of the configuration for rotating the workpiece support plate 33 up and down is omitted.

  As already understood, according to the press brake 1 according to the present embodiment, the left and right workpieces correspond to the left and right positions of the workpiece to be bent by the upper and lower molds and the width dimension of the workpiece in the left and right direction. The support device 15 can be appropriately positioned and used. The workpiece that is bent by the mold can be supported by the workpiece support plate 33.

  By the way, as is clear from FIGS. 1 and 2, the front plate 7 and the rear plate 9 are configured to be thinner than the thickness of the lower table 5. The lower table 5 is pressed upward relative to the front plate 7 and the rear plate 9 by the crowning cylinder 11, and the lower table 5 is curved upward. Therefore, the center part side of the left-right direction of the said front board 7 and the rear board 9 exists in the state away without connecting with the lower table 5 integrally.

  In the above configuration, as described above, when the work support device 15 is mounted on the front surface of the front plate 7, the front plate 7 is counterclockwise (forward) in FIG. 2 due to the weight (load) of the work support device 15. ) Tend to be slightly inclined. Therefore, it is also conceivable to connect the guide base 17 and the like to the lower table 5 having high rigidity via a support column. However, the lower table 5 is curved in a convex shape upward every time crowning is performed. Therefore, the weight of the workpiece support device 15 moving in the left-right direction may affect the crowning accuracy. Therefore, the influence of the load of the work support device 15 on the lower table 5 is not desirable for improving the bending accuracy.

  In view of the above problems, in the present embodiment, a configuration for improving the rigidity of the front plate 7 is employed. That is, at a height position corresponding to the upper side of the front plate 7 and the rear plate 9, the lower table 5 is provided with a plurality of through holes 35 (see FIG. 2) penetrating in the front-rear direction. A plurality of the through-holes 35 are provided at the same height between the left and right side frames 3L, 3R with appropriate spacing in the left-right direction.

  In each through hole 35, the inclination of the front plate 7 in the counterclockwise direction in FIG. 2 is restricted, and the distance between the upper side of the front plate 7 and the upper side of the rear plate 9 is set. An interval holding member 37 is inserted (penetrated) so as to always keep the constant. The spacing member 37 on the upper side is composed of, for example, a tightening bolt or the like, and restricts the upper side of the front plate 7 and the upper side of the rear plate 9 from moving in directions away from each other. The function of adjusting the distance between the front plate 7 and the rear plate 9 is achieved.

  In addition, the lower side of the front plate 7 and the lower side of the rear plate 9 are restricted from approaching between the lower side of the front plate 7 and the lower side of the rear plate 9. In order to keep the interval constant at all times, a lower-side interval holding member 39 is provided. The spacing member 39 is disposed at a lower position of the lower table 5. The lower interval holding member 39, like the upper interval holding member 37, has a plurality of left and right side frames 3L, 3R with an appropriate interval in the left and right direction at the same height position. Is provided. The spacing member 39 is constituted by, for example, a push bolt (a tension bolt) that is screwed to the front plate 7 so as to be able to move back and forth and whose front end is in contact with the rear plate 9.

  Therefore, the gap holding member 39 has a function of always holding the lower side of the front plate 7 and the rear plate 9 constant and a function of adjusting the gap of the lower side of the front plate 7 and the rear plate 9.

  As understood from the above description, the upper side and the lower side of the front plate 7 and the rear plate 9 are always kept at a constant interval by the plurality of interval holding members 37 on the upper side and the plurality of interval holding members 39 on the lower side. It is what is being held. In other words, by providing a plurality of upper and lower spacing members 37 and 39, the front plate 7 is reinforced by the rear plate 9, and the rigidity of the front plate 7 is improved. Further, the front plate 7 can be adjusted to a vertical state by adjusting the upper and lower spacing members 37 and 39.

  Therefore, even when the workpiece support device 15 is provided on the front surface of the front plate 7 as described above, the front plate 7 can be prevented from being inclined counterclockwise in FIG. Therefore, when the workpiece is supported by the workpiece support plate 33 in the workpiece support device 15, the workpiece can be supported with good accuracy.

  The upper and lower sides of the front plate 7 and the rear plate 9 are always held at substantially constant intervals by upper and lower interval holding members 37 and 39 provided at appropriate intervals in the left and right direction, and the front plate 7 is held in a vertical state. Therefore, even if the work support device 15 moves in the left-right direction, the position of the load acting on the front plate 7 moves in the left-right direction.

  By the way, the present invention is not limited to the embodiment described above, and can be implemented in other forms by making appropriate changes. That is, one of the upper and lower spacing members 37 and 39 can be omitted as appropriate. Further, a balance weight may be provided on the rear surface of the rear plate 9 so that a moment in the clockwise direction in FIG. 2 is applied to the rear plate 9.

DESCRIPTION OF SYMBOLS 1 Press brake 3 L, R side frame 5 Lower table 7 Front board 9 Rear board 11 Crowning cylinder 15 Work support apparatus 35 Through-hole 37 Upper side space holding member 39 Lower side space holding member

Claims (4)

A press brake having a lower table at the front lower part of the left and right side frames, an upper table being movable up and down at the front upper part of the side frame, and a front plate and a rear plate at the front and rear of the lower table, respectively. An upper side of the front plate and the rear plate in order to regulate the inclination of the front plate due to the weight of the work support device Are provided at the top and bottom, and the lower spacing member is a push having a function of adjusting the spacing between the lower side of the front plate and the rear plate. A press brake comprising a bolt .   2. The press brake according to claim 1, wherein an upper-side interval holding member for constantly holding an upper-side interval between the front plate and the rear plate passes through the lower table in the front-rear direction, and the front plate The press brake is connected to the front plate and the rear plate so as to restrict the upper side of the upper plate and the rear plate from separating from each other, and a plurality of press brakes are provided at appropriate intervals in the left-right direction.   3. The press brake according to claim 1, wherein the lower side holding member for keeping the lower side gap between the front plate and the rear plate always constant is close to the lower side of the front plate and the rear plate. A press brake which is provided between the front plate and the rear plate so as to restrict the operation, and a plurality of press brakes are provided at appropriate intervals in the left-right direction. A press brake having a lower table at the front lower part of the left and right side frames, an upper table being movable up and down at the front upper part of the side frame, and a front plate and a rear plate at the front and rear of the lower table, respectively. A work support device for supporting the workpiece to be bent is provided on the front side of the front plate, and the inclination of the front plate due to the weight of the work support device is regulated to allow an interval between the front plate and the rear plate. always a plurality of spacing members for holding constant, the lower portion side of the front plate and the rear plate, and provided with the appropriate spacing in the lateral direction between the left and right side frames, said spacing members A press brake comprising a push bolt having a function of adjusting a distance between a lower side of the front plate and the rear plate .

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