JP2007069242A - Press brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press brake in which the positioning of a work is performed even on the outside of a side frame. <P>SOLUTION: This press brake is a press brake which is provided with a plurality of back gages 27L, 27R for positioning a work W which is bent with upper and lower dies 11, 13 so as to be individually movable in directions of back and forth, up and down and right and left in the rear position of a lower table 7. A striking member housing part 35 for housing a striking member 25 for striking the work W is provided within the moving region of the back gages 27L, 27R, striking member holding means 29U, 29L for holding the striking member 25 are provided on each back gage 27L, 27R and also a work contacting part for positioning the work W by contacting the work W is provided. In the state where the striking member 25 is held with the back gages 27L, 27R, the striking member 25 is constituted projectably to the outside of the side frames 3L, 3R of the press brake and the striking member housing part 35 is provided on the back of the lower table 7. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a press brake, and more particularly to a press brake provided with a plurality of back gauges that can be moved individually in the front-rear, up-down, left-right directions.

The press brake has a configuration in which an upper table is provided on the upper side of the C-shaped left and right side frames and a lower table is provided on the lower side. Then, one of the upper table and the lower table is configured as a movable table (ram) that can move up and down, and a plate-like workpiece is sandwiched between an upper mold provided in the upper table and a lower mold provided in the lower table. In this configuration, the workpiece is bent. And when positioning the said workpiece | work in the front-back direction, the back gauge for contacting and positioning the rear-end part of a workpiece | work is provided in the back of the said lower table so that it can move back and forth (refer patent document 1). .
JP-A-10-34242

  The back gauge in the press brake moves back and forth, left and right, and up and down between the left and right side frames behind the lower table. Therefore, there is a problem in that the workpiece cannot be positioned against the outside of the side frame. Furthermore, since the back gauge is generally a pair, when the back gauge is largely separated from side to side, if the center of the work is held against the back gauge while holding the center in the left-right direction, the center of the work There exists a problem that it may curve so that it may protrude rearward.

  The present invention has been made in view of the above-described problems, and includes a lower table that supports a lower mold and an upper table that supports an upper mold, and a workpiece that is bent by the upper and lower molds. A press brake comprising a plurality of back gauges for positioning that can be individually moved in the front, back, top, bottom, left and right directions at a rear position of the lower table, and abutting a workpiece in a movement region of the back gauge. The abutting member storing portion for storing the abutting member for performing is provided, and each back gauge is provided with abutting member holding means for holding the abutting member, and the workpiece is brought into contact with the back gauge to position the workpiece. It is characterized by providing the workpiece contact part for this.

  In the press brake, the abutting member can be projected to the outside of the side frame of the press brake in a state where the abutting member is held by the back gauge.

  In the press brake, the abutting member storage portion is provided on the back surface of the lower table.

  According to the present invention, the workpiece can be used in the same manner as a normal back gauge by positioning the workpiece by bringing the workpiece into contact with the workpiece contacting portion of the back gauge. In the state where the abutting member is held by the abutting member holding portion of the back gauge, the end of the abutting member is moved from the side frame of the press brake to the outside in the left-right direction by moving the back gauge in the left-right direction. Can protrude into.

  Therefore, positioning can be performed by abutting the workpiece against the abutting member outside the side frame. Further, the workpiece can be contacted and positioned over the entire length of the abutting member.

  Hereinafter, the press brake according to the embodiment of the present invention will be described with reference to the drawings. The overall configuration of the press brake is the same as that of a general press brake. That is, as shown in FIG. 1, the press brake 1 includes an upper table 5 above the C-shaped left and right side frames 3L, 3R and a lower table 7 below the side frames 3L, 3R. .

  One of the upper table 5 or the lower table 7 is configured as a movable table (ram) that can move up and down. In the present embodiment, the upper table 5 is configured to move up and down, and in order to move the upper table 5 up and down, the upper side of the side frames 3L and 3R has an actuator 9L for vertical movement such as a hydraulic cylinder. , 9R is installed. In order to bend the plate-like workpiece W, an upper die 11 is attached to the lower portion of the upper table 5, and a lower die 13 is attached to the upper portion of the lower table 7. As can be understood from FIG. 1, the left and right sides of the upper table 5 and the lower table 7 protrude from the side frames 3L and 3R in the left-right direction.

  When the workpiece W is bent by the upper mold 11 and the lower mold 13, a back gauge for positioning the workpiece W in the front-rear direction is provided so as to be movable in the front-rear, left-right, and vertical directions. More specifically, as conceptually and schematically shown in FIGS. 2 and 3, a guide rail 15 that is long in the left-right direction (the direction perpendicular to the paper surface in FIG. 3) is provided on the rear side of the lower table 7. The guide rail 15 is provided with left and right sliders 17L and 17R so as to be movable in the left-right direction.

  The guide rail 15 is provided on the back surface of the lower table 7. However, the guide rail 15 may be configured such that the left and right side frames 3L and 3R are supported on both left and right sides, for example, a base plate (not shown). ) The structure laid on the top may be sufficient. In short, the guide rail 15 only needs to have a function of moving and guiding the left and right sliders 17L and 17R in the left-right direction. The left and right sliders 17L and 17R are individually movable in the left and right directions by a left and right moving device (not shown) such as a ball screw mechanism rotated by a servo motor or a linear motor.

  The left and right sliders 17L, 17R are long in the front-rear direction (left-right direction in FIGS. 1 and 2), and the left and right sliders 17L, 17R are provided with front-rear direction guide portions 19L, 19R. The left and right sliders 17L and 17R respectively support front and rear sliders 21L and 21R that are movable back and forth along the guide portions 19L and 19R. The left and right front and rear sliders 21L and 21R are supported by upper and lower sliders 23L and 23R, respectively. Are mounted to move up and down.

  The front / rear sliders 21L, 21R are configured to be individually movable in the front / rear direction by a front / rear moving device (not shown) such as a ball screw mechanism rotated by a linear motor or a servo motor. The vertical sliders 23L and 23R are individually movable up and down by a vertical movement device (not shown) having the same configuration as the longitudinal movement device.

  Abutting member holding means 27L and 27R for holding (gripping) the abutting member 25 are mounted on the left and right upper and lower sliders 23L and 23R, respectively. The abutting member holding means 27L, 27R constitute a back gauge for positioning the workpiece W in the front-rear direction, and can be opened and closed freely openable upper and lower jaws 29U, 29L ( 4). The front surfaces of the upper and lower jaws 29U and 29L are formed on a workpiece contact surface (work contact portion) on which the workpiece W can freely contact. In other words, the back gauge itself is provided with the abutting member holding means 27L and 27R for holding the abutting member 25 and the workpiece abutting portion for abutting the workpiece W and positioning the workpiece W. It is a configuration.

  As understood from the above description, the left and right sliders 17L, 17R are moved and positioned in the left-right direction under the control of a control device (not shown) such as an NC device, for example, and the left and right front-rear sliders 21L, 21L, 21R is moved and positioned in the front-rear direction, and left and right upper and lower sliders 23L, 23R are moved and positioned in the up-down direction, so that the left and right abutting member holding means 27L, 27R are moved in the left-right direction (X-axis direction), the front-rear direction ( It can be moved and positioned individually in the Y-axis direction) and in the vertical direction (Z-axis direction).

  Therefore, for example, when a step portion in the front-rear direction is formed at the rear edge of the workpiece W, the left and right abutting member holding means 27L and 27R can be shifted back and forth corresponding to the step portion. It can be easily handled. Further, when step bending is performed by arranging a plurality of molds 11 and 13 on the upper and lower tables 5 and 7 between the side frames 3L and 3R in the press brake 1 at appropriate intervals in the left and right direction, each mold 11 is provided. , 13 can be positioned by moving the abutting member holding means 27L, 27R in the left-right direction and positioning the workpiece W in the front-rear direction.

  The abutting member 25 is formed of a long member that is long in the left-right direction. The abutting member 25 includes a workpiece contact surface 31 for abutting the workpiece W, and the upper and lower jaws. A held portion 33 held (gripped) by 29U and 29L is provided. The abutting member 25 is stored in an abutting member storage portion 35 provided in a moving area of the abutting member holding means 27L and 27R as back gauges. In this example, the abutting member storage portion 35 is configured by including a support bracket 37 that supports the abutting member 25 on the back surface of the lower table 7.

  With the above configuration, when the abutting member 25 is held by the left and right abutting member holding means 27L and 27R, as shown in FIGS. 4 (B) and 5 (C), the work contact of the abutting member 25 is achieved. The workpiece W can be brought into contact with the surface 31 to position the workpiece W in the front-rear direction. In this case, the workpiece W can be brought into contact with the entire length of the abutting member 25 in the left-right direction. Therefore, when the workpiece W is held in contact with the abutting member 25 while holding the substantially central portion in the left-right direction of the workpiece W, the vicinity of the central portion in the left-right direction of the workpiece W is prevented from being curved and deformed in a rearward convex shape. And accurate positioning can be performed. That is, for example, even in the case of a work that is elongated in the left-right direction and easily deforms in the front-rear direction, the work can be positioned in the front-rear direction with the deformation suppressed.

  Further, with the above configuration, as shown in FIG. 5 (D), one end side of the abutting member 25 can protrude outward in the left-right direction of the side frames 3L, 3R, and a workpiece is placed in the vicinity of the side frames 3L, 3R. Even when W bending is performed, the workpiece W can be positioned in the front-rear direction.

  The operation of projecting one end side of the abutting member 25 to the outside of the side frames 3L and 3R is performed by the left and right abutting member holding means 27L and 27R as shown in FIGS. When holding the abutting member 25, the left and right abutting member holding means 27L, 27R are moved toward the other end side of the abutting member 25 to hold the abutting member 25, and then the left and right sliders 17L, 17R are synchronized. This is done by moving in the same direction. Alternatively, after holding the abutting member 25 by the left and right abutting holding means 27L, 27R, one abutting holding means 27R (or 27L) is opened, and the abutting member by the other abutting holding means 27L (or 27R). It is also possible to move 25 in the left-right direction.

  As can be understood from the above description, the workpiece W is brought into contact with the abutting member holding means 27L and 27R as back gauges that can be individually moved and positioned in the front-rear, left-right, and up-down directions to position the workpiece W in the front-rear direction. Therefore, even if a step portion in the front-rear direction is formed in the abutting portion of the workpiece W, it can be easily handled. Further, the long abutting member 25 is held by the abutting members 27L and 27R, and the workpiece W is brought into contact with the workpiece abutting surface 31 of the abutting member 25 for positioning in the front-rear direction. The abutting portion can be abutted against the abutting member 25 over the entire length. Furthermore, one end side of the abutting member 25 can protrude outward in the left-right direction of the side frames 3L, 3R, and the workpiece W can be positioned also outside the side frames 3L, 3R.

  By the way, the present invention is not limited to the above-described embodiments, and can be implemented in other modes by making appropriate changes. For example, the structure of the held portion 33 of the abutting member 25 may be a groove that is long in the left-right direction. In this case, the upper and lower jaws 29U, 29L in the left and right abutting member holding means 27L, 27R may enter the groove and open up and down to hold (hold) the abutting member 25. It is.

  Moreover, as a structure of the to-be-held part 33 of the said abutting member 25, it is also possible to set it as the structure provided with many protrusion parts or holes in the longitudinal direction of the abutting member 25 with an appropriate pitch. In this case, the protruding member is held by the upper and lower jaws 29U, 29L in the abutting member holding means 27L, 27R, or the abutting member holding means 27L, 27R is provided with a collet chuck that can be opened and closed. It is also possible to adopt a configuration that holds the part. When the held portion 33 has a hole configuration, the abutting member holding means 27L and 27R may be provided with an engagement member such as a pin that can be engaged with and released from the hole. It is.

  Furthermore, the abutting member holding means 27L and 27R may be provided with an electromagnet or the like to magnetically attach the abutting member 25. That is, various changes can be made.

It is explanatory drawing which shows the whole structure of a press brake. It is a plane explanatory view showing the principal part of the press brake concerning the embodiment of the present invention. It is side explanatory drawing same as the above. It is explanatory drawing in the case of positioning a workpiece | work. It is operation | movement explanatory drawing when using a butting member.

Explanation of symbols

1 Press brake 3L, 3R Side frame 5 Upper table 7 Lower table 11 Upper mold 13 Lower mold 17L, 17R Left / right slider 21L, 21R Front / rear slider 23L, 23R Vertical slider 25 Abutting member 27L, 27R Abutting member holding means 31 Workpiece contact Contact surface 33 Holding part 35 Abutting member storage part

Claims (3)

  A plurality of back gauges for positioning a workpiece to be bent by the upper and lower molds are provided at a rear position of the lower table, including a lower table supporting the lower mold and an upper table supporting the upper mold. A press brake that is individually movable in the front-rear, up-down, and left-right directions, and includes an abutting member storage portion that stores an abutting member for abutting the workpiece in the movement area of the back gauge. Each of the back gauges includes a pressing member holding means for holding the pressing member and a work contact portion for contacting the work and positioning the work. brake.   2. The press brake according to claim 1, wherein the abutting member is configured to be protruded to the outside of a side frame in the press brake in a state where the abutting member is held by the back gauge. .   3. The press brake according to claim 1, wherein the abutting member storage portion is provided on a back surface of the lower table.

Images