JP6272122B2 - Guide rail fixing structure for press brake - Google Patents

Description

  The present invention moves and guides guide rails arranged on the front side of a lower frame (also referred to as a lower table) of a press brake, that is, an auxiliary device such as a workpiece follower or a robot that supports a workpiece to be bent in the left-right direction. The present invention relates to a guide rail fixing structure provided for the purpose.

  2. Description of the Related Art Conventionally, a press brake that bends a relatively large plate-shaped workpiece is provided with a workpiece follower that supports the workpiece by following the workpiece that gradually rises and tilts as the workpiece is bent. The workpiece follower is normally provided so as to be movable in the left-right direction. In many cases, the work following device is provided so as to be able to move from the front front position of the press brake to the side standby position. In the press brake, a guide rail (also referred to as a guide bar) for moving and guiding such a workpiece follower in the left-right direction is provided on the front surface of the lower frame.

  FIG. 6 is a front view of a press brake provided with this type of work following device described in Patent Document 1. FIG.

  This press brake has left and right side plates 1 and 2 erected on both sides in the left and right direction (X-axis direction) and an upper mold (not shown) at the lower end, and is supported on the upper portions of the left and right side plates 1 and 2. The upper frame 3 and the lower mold (not shown) opposed to the upper mold are held at the upper end, the lower frame 4 supported by the lower portions of the left and right side plates 1 and 2, the upper frame 3 and the lower frame 4 are relatively And a drive mechanism (not shown) for bending a plate-shaped workpiece between the upper die and the lower die by moving the plate closer to the upper die.

  In this press brake, after placing and positioning a plate-like work (not shown) on the lower mold mounted on the lower frame 4, the upper mold mounted on the lower end of the upper frame, for example, by lowering the upper frame. The workpiece is bent in cooperation with the lower die. When the workpiece is bent, the front side of the workpiece gradually rises and inclines. In order to follow the rising inclination of the work and support the work, a work follower 5 is provided on the front side of the lower frame 4 so as to be movable and positioned in the left-right direction. An upper and lower guide rail 6 that is long in the left-right direction is provided on the front surface of the lower frame 4, and the workpiece follower 5 is moved and positioned by being guided by the guide rail 6.

  FIG. 7 is a perspective view showing a partial configuration of a similar example of this type of press brake.

  In FIG. 7, left and right side plates 11 and 12 are disposed on both sides in the left and right direction (X-axis direction in the drawing), and a lower frame 14 is provided below these left and right side plates 11 and 12. A front plate 15 is provided on the front side of the lower frame 14 in the front-rear direction (Y-axis direction in the figure), and a rear plate 16 is provided on the rear side. Two front and lower guide rails 21 and 22 are provided on the front surface of the front plate 15 to move and guide the movable frame 30 of an auxiliary device such as a work following device in the left-right direction (X-axis direction in the drawing).

  The upper guide rail 21 performs linear motion in the left-right direction (X-axis direction in the figure) while supporting the load in the vertical direction (Z-axis direction in the figure) and the load in the front-rear direction (Y-axis direction in the figure) of the auxiliary device. The lower guide rail 22 is a guide to be guided (for example, “LM guide”), and the lower guide rail 22 supports the load in the front-rear direction (Y-axis direction in the figure) of the auxiliary device in the left-right direction (X-axis in the figure) This is a guide for a cam follower that guides a linear motion in the direction). That is, the lower guide rail 22 is provided so as to receive only a load in a direction (front-rear direction) perpendicular to the lower frame 14, particularly a load in a direction from the front to the rear.

  The guide rails 21 and 22 can freely reciprocate the auxiliary device between the front position of the press brake and the side retracted position (the right end position where the movable frame 30 of the auxiliary device is located in FIG. 7). The guide rails 21 and 22 are fixed to the front surface of the front plate 15 disposed on the front side of the lower frame 14 in a range where the lower frame 14 is present. In the vicinity of the retracted position, guide rails 21 and 22 are fixed to the front surface of a separately provided support frame 32. Further, a lower frame 14, a front plate 15, and a lacking portion 17 of the rear plate 16 are provided at the lower right end of the lower frame 14, and the guide rail 22 is fixed to the front plate 15 in the lacking portion 17. Therefore, the guide rail 22 is attached to the bracket 40 fixed to the right side plate 12 facing from the lacking portion 17.

  8 is an enlarged view of portion A of FIG. 7, FIG. 9 is a perspective view of the conventional guide rail fixing structure shown in FIG. 8 as viewed from the rear, and an enlarged view of the main part thereof, and FIG. FIG. 11A is an enlarged perspective view of a state in which the bracket fixed to the side surface of the side plate is fixed to the guide rail with a bolt as viewed from the rear, and FIG. 11A is cut along a vertical plane including the axis of the bolt shown in FIG. Sectional drawing of the fixing | fixed part by the bracket which was done, FIG.11 (b) is an enlarged view of the principal part.

  As shown in FIGS. 8 to 11, the bracket 40 is L-shaped in a top view having first and second fixing plates 41 and 42 that are orthogonal to each other. Then, the first fixing plate 41 is fixed to the lateral outer surface of the side plate 12 fixed on the base 10 with two bolts 61, and the second fixing plate 42 acts on the guide rail 22. In order to support the load in the direction from the front to the rear, the front surface 42a is fixed to the guide rail 22 with bolts 62 in a state where the front surface 42a is in contact with the rear surface 22a of the rectangular guide rail 22. In this way, the guide rail 22 is supported by the side plate 12 via the bracket 40 in the lower frame 14, the missing portion 17 of the front plate 15 and the rear plate 16.

  By the way, the front plate 15 that fixes the guide rail 22 at a place other than the lacking portion 17 is bent downward by a processing reaction force during bending of the press brake. It is necessary to support the guide rail 22 so as not to prevent the guide rail 22 from being slightly displaced downward, that is, in a state in which the guide rail 22 is allowed to be slightly displaced in the vertical direction.

  Therefore, as shown in FIGS. 10 and 11, the mounting hole 45 of the second fixing plate 42 is formed larger than the bolt 62, and the bolt 62 for screwing the shaft portion 62 a into the screw hole 22 s of the guide rail 22. Between the washer 63 below the head portion 62b and the rear surface 22a of the guide rail 22, a cylindrical collar 64 fitted into the shaft portion 62a is interposed. The thickness t2 of the collar 64 is set to be greater than the thickness t1 of the second fixing plate 42 of the bracket 40. Even if the bolt 62 is tightened into the screw hole 22s of the guide rail 22, the washer 63 and the second fixing plate A gap h <b> 1 is secured between the rear face 42 b of the face 42 and the washer 63 is prevented from contacting the rear face 42 b of the second fixing plate 42. The mounting hole 45 of the second fixing plate 42 is formed as a round hole larger than the outer diameter of the collar 64, although the diameter is smaller than the outer diameter of the washer 63. In the meantime, the play (gap) h <b> 2 is secured so that the guide rail 22 can freely freely move up and down.

  Thereby, the guide rail 22 is supported by the bracket 40 in a state in which a minute displacement in the vertical direction of the guide rail 22 is allowed.

JP 2013-167683 A

  By the way, in order to allow the vertical displacement of the guide rail 22 properly, the second fixing plate 42 of the bracket 40 is fixed to the screw hole 22s provided on the guide rail 22 side by the bolt 62 in an appropriate positional relationship. However, it is difficult to align the mounting hole 45 and the screw hole 22s in the vertical direction only by visual observation, and a method for confirming whether the guide rail 22 and the bracket 40 can be fixed in an appropriate positional relationship. There was no problem.

  In consideration of the above circumstances, the present invention can fix the bracket and the guide rail while easily positioning the bracket and the guide rail in the vertical direction, and is fixed in an appropriate positional relationship. It is an object of the present invention to provide a guide rail fixing structure in a press brake that can be easily confirmed.

  In order to solve the above-mentioned problems, the present invention holds left and right side plates, an upper frame that holds an upper die at the lower end and is supported by the upper portions of the left and right side plates, and a lower die that faces the upper die at the upper end. A lower frame supported by lower portions of the left and right side plates, and a drive mechanism for bending a plate-like workpiece between the upper die and the lower die by relatively moving the upper frame and the lower frame closer to each other. An auxiliary device arranged on the front side of the lower frame, and guides the movement of the auxiliary device in the left-right direction to the front surface of the lower frame of the press brake. A guide rail that supports only the load in the direction is provided, and the guide rail is fixed to the front surface of the lower frame within a range of the lower frame, The portion is fixed to the side plate via a bracket, and the bracket has an L shape in a top view having first and second fixing plates orthogonal to each other, and the first fixing plate of the bracket is the side plate. The second fixing plate abuts the front surface of the guide rail against the rear surface of the guide rail in order to support the load in the direction from the front to the back of the guide rail. And fixing the guide rail in the press brake that supports the guide rail in the lacking portion of the lower frame by being bolted and fixed to the guide rail in a state in which a minute displacement in the vertical direction of the guide rail is allowed. In the structure, the second fixing plate of the bracket is brought into contact with the upper end of the guide rail, whereby the guide rail is changed downward. While permitting the, characterized in that the position regulating projection for regulating the vertical position of the guide rail and the bracket is provided.

  According to the present invention, the position-regulating protrusion provided on the second fixing plate of the bracket is brought into contact with the upper end of the guide rail, whereby the bracket and the guide rail can be easily positioned in the vertical direction. Can be bolted. Moreover, since the position restricting projection is in contact with the upper end of the guide rail, it can be easily confirmed that the bracket and the guide rail are properly positioned in the vertical direction.

It is the perspective view seen from the front of the fixation structure of the guide rail of embodiment of this invention. It is the perspective view seen from the back of the fixing structure. It is the expansion perspective view which looked at the state which is going to fix the bracket fixed to the outer surface of a side plate to a guide rail with a volt | bolt in order to make the fixing structure. It is the expansion perspective view which looked at the state which fixed the bracket to the guide rail with the volt | bolt from back. (A) is sectional drawing of the fixing | fixed part by the bracket cut | disconnected by the vertical plane containing the axis line of the said volt | bolt, (b) is an enlarged view of the principal part. It is a front view of a press brake provided with the conventional work following device. It is the perspective view seen from the front which shows the structure of a part of press brake of the similar example of FIG. It is an enlarged view of the A section of FIG. It is the perspective view seen from the back of the fixing structure of the conventional guide rail, and the enlarged view of the principal part. It is the expansion perspective view which looked at the state which is going to fix the bracket fixed to the side surface of a side plate to a guide rail with a volt | bolt in order to make the conventional fixing structure. (A) is sectional drawing of the fixing | fixed part by the bracket cut | disconnected by the vertical plane containing the axis line of the said volt | bolt shown in FIG. 9, (b) is an enlarged view of the principal part.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The press brake according to the embodiment is similar to the press brake shown in FIG. 7, the left and right side plates, the upper frame that holds the upper mold at the lower end and supported by the upper portions of the left and right side plates, and the upper mold that faces the upper mold. A lower frame that holds the lower mold and is supported by the lower parts of the left and right side plates, and a drive mechanism that bends the plate-shaped workpiece between the upper mold and the lower mold by moving the upper and lower frames relatively close to each other. And.

  FIG. 1 is a perspective view seen from the front of the guide rail fixing structure of the embodiment, FIG. 2 is a perspective view seen from the rear of the fixing structure, and FIG. 3 is fixed to the outer surface of the side plate to make the fixing structure. FIG. 4 is an enlarged perspective view of a state in which the bracket is fixed to the guide rail with a bolt as viewed from the rear, and FIG. 4 is an enlarged perspective view of the state in which the bracket is fixed to the guide rail with a bolt as viewed from the rear. FIG. 5B is a cross-sectional view of a fixing portion by a bracket cut along a vertical plane including the axis of the bolt, and FIG. 5B is an enlarged view of a main portion thereof.

  The fixing structure of this embodiment is different from the conventional fixing structure shown in FIGS. 7 to 11 in that a guide is provided using a new bracket 50 instead of the conventional bracket 40 as shown in FIGS. The other points are the same as those of the conventional fixing structure shown in FIGS. 7 to 11, and the same points are denoted by the same reference numerals in FIG. Only the differences will be described.

  As shown in FIGS. 1 to 5, the bracket 50 used in the fixing structure of the embodiment is L-shaped in a top view having first and second fixing plates 51 and 52 that are orthogonal to each other. . Then, the first fixing plate 51 is fixed to the outer side surface in the left-right direction of the side plate 12 fixed on the base 10 with two bolts 61, and the second fixing plate 52 acts on the guide rail 22. In order to support the load in the direction from the front to the rear, the front surface 52a is fixed to the guide rail 22 with a bolt 62 in a state where the front surface 52a is in contact with the rear surface 22a of the guide rail 22 having a rectangular cross section. In this way, the guide rail 22 is supported by the side plate 12 via the bracket 50 in the lack part 17 of the lower frame 14, the front plate 15 and the rear plate 16.

  Further, the second fixing plate 52 of the bracket 50 is in contact with the upper surface 22b of the guide rail 22 so that the guide rail 22 and the bracket 50 are vertically displaced in a state in which the guide rail 22 is allowed to be displaced downward. The position restricting projection 58 for restricting the position of the guide rail 22 is integrally provided by bending, and the bolt 62 is inserted into the screw hole 22 s of the guide rail 22 in a state where the position restricting protrusion 58 is in contact with the upper surface 22 b of the guide rail 22. It is concluded.

  Also in this case, as shown in FIG. 5, the mounting hole 55 of the second fixing plate 52 is formed larger than the bolt 62, and the head of the bolt 62 for screwing the shaft portion 62 a into the screw hole 22 s of the guide rail 22. Between the washer 63 below the portion 62b and the rear surface 22a of the guide rail 22, a cylindrical collar 64 fitted into the shaft portion 62a is interposed. The thickness t2 of the collar 64 is set to be greater than the thickness t1 of the second fixing plate 52 of the bracket 50. Even if the bolt 62 is tightened into the screw hole 22s of the guide rail 22, the washer 63 and the second fixing plate are set. A gap h <b> 1 is secured between the rear surface 52 b and the rear surface 52 b, so that the washer 63 does not contact the rear surface 52 b of the second fixing plate 52. The mounting hole 55 of the second fixing plate 52 is formed as a round hole larger than the outer diameter of the collar 64, although it has a smaller diameter than the outer diameter of the washer 63. In the meantime, the play (gap) h <b> 2 is secured so that the guide rail 22 can freely freely move up and down.

  Thereby, the guide rail 22 is supported by the bracket 50 in a state in which a minute displacement in the vertical direction of the guide rail 22 is allowed.

  When the fixing structure of this embodiment is obtained, the first fixing plate 51 of the bracket 50 is fixed to the side plate 12 with the bolt 61 in a state where the position restricting projection 58 is in contact with the upper surface 22b of the guide rail 22. In this state, the second fixing plate 52 of the bracket 50 is fixed to the guide rail 22 by the bolt 62. By doing so, the bracket 50 and the guide rail 22 can be bolted while easily positioning the bracket 50 and the guide rail 22 in the vertical direction. Moreover, since the position restricting projection 58 is in contact with the upper surface 22b of the guide rail 22, it can be easily confirmed that the bracket 50 and the guide rail 22 are properly positioned in the vertical direction.

11, 12 Side plate 14 Lower frame 17 Missing portion 22 Guide rail 22a Rear surface 22b Upper surface 50 Bracket 51 First fixing plate 52 Second fixing plate 52a Front surface 58 Position regulating protrusion 61, 62 Bolt

Claims (1)

The left and right side plates, the upper frame holding the upper mold at the lower end and supported on the upper part of the left and right side plates, the lower frame holding the lower mold facing the upper mold at the upper end and supported by the lower parts of the left and right side plates A drive mechanism for bending a plate-like workpiece between the upper mold and the lower mold by relatively moving the upper frame and the lower frame closer to each other; and an auxiliary device disposed on the front side of the lower frame A guide rail is provided on the front surface of the lower frame of the press brake provided with a guide rail that guides the movement of the auxiliary device in the left-right direction and supports only the load received from the auxiliary device in the direction from the front to the rear. ,
The guide rail is fixed to the front surface of the lower frame in a range of the lower frame, and is fixed to the side plate via a bracket in a lacking portion of the lower frame,
The bracket is L-shaped in a top view having two first and second fixing plates orthogonal to each other, and the first fixing plate of the bracket is bolted and fixed to one side surface of the side plate in the left-right direction, In order to support the load in the direction from the front to the back of the second fixing plate acting on the guide rail, the front surface of the second fixing plate is brought into contact with the rear surface of the guide rail, and the guide rail has a minute displacement in the vertical direction. In the guide rail fixing structure in the press brake that supports the guide rail in the lacking part of the lower frame by being bolted and fixed to the guide rail in a state that allows
A position that regulates the vertical position of the guide rail and the bracket in a state in which the guide rail is allowed to move downward by contacting the upper end of the guide rail with the second fixing plate of the bracket. A guide rail fixing structure in a press brake, wherein a restriction protrusion is provided.

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