JP2013146750A - Plate material bending method and plate material bending machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plate material bending method and a plate material bending machine capable of carrying out bending work equivalent to the three point bending work of air bending work using a punch and a die in a press brake.SOLUTION: A plate material bending method is used to carry out bending work by a plate material bending machine provided with a top die 3 and a bottom die 5 which sandwich a plate-like work-piece W from the top and bottom and a bending die 7 provided vertically movably for bending the projected portion WP of the work-piece W projected from the tip edges 3A and 5A of the top die 3 and the bottom die 5 up and down. The bending work is carried out by retaining the tip edge 3A of the top die 3 from the tip edge 5A of the bottom die 5 in a projected state when bending the projected portion WP of the work-piece W in the upper direction and by retaining the tip edge 5A of the bottom die 5 from the tip edge 3A of the top die 3 in the projected state when bending the projected portion WP of the work-piece W in the lower direction.

Description

  The present invention includes a top die and a bottom die for sandwiching a plate-like workpiece from above and below, and a bending die for vertically folding a protruding portion of the workpiece protruding from the top edge of the top die and bottom die can be moved up and down. In particular, the present invention relates to a plate bending method and a plate bending machine using a plate bending machine, and more specifically, the work clamping force of the top die and the bottom die can be reduced, and the tips of the top die and bottom die can be reduced. The present invention relates to a plate bending method and a plate bending machine capable of reducing edge wear.

  For example, when a right-angle notch is formed in each corner of a rectangular plate-shaped workpiece and then the four side edges of the workpiece are bent up and down, a plate bending machine different from the press brake is used. It is used. The plate material bending machine is an ironing bending machine, and includes a top die and a bottom die for sandwiching a workpiece from above and below, and the top edge of the top die and the protruding portion of the workpiece protruding from the top edge of the bottom die are moved up and down. A bending die for bending is provided (for example, see Patent Document 1).

JP 2004-216445 A

  As described in Patent Document 1, the leading edge of the top die and the leading edge of the bottom die in a conventional plate bending machine are not displaced in the front-rear direction (the direction perpendicular to the longitudinal direction of the leading edge). Configured to match. Therefore, when the protruding portion of the workpiece is bent up and down by the bending die, the top edges of the top die and the bottom die serve as fulcrums for bending the workpiece. Therefore, it is necessary to pinch the workpiece with a large force, and the wear at the tip edge is severe.

  The present invention has been made in view of the above-described problems, and includes a top die and a bottom die for sandwiching a plate-like workpiece from above and below, and a protruding portion of the workpiece protruding from the leading edge of the top die and the bottom die. A plate material bending method by a plate material bending machine equipped with a bending mold for bending up and down, and when the protruding portion of the workpiece is bent upward, the tip edge of the bottom die When the top edge of the top die is protruded from the top and the protruding part of the workpiece is bent downward, the tip edge of the bottom die is held protruding from the top edge of the top die and bent. It is characterized by performing.

  In addition to having a top die and a bottom die for sandwiching a plate-shaped workpiece from above and below, a bending die for bending the protruding portion of the workpiece protruding from the top edge of the top die and bottom die up and down can be moved up and down. A plate material bending machine provided with at least one tip edge of the top die or the bottom die so as to be able to protrude relative to the other tip edge.

  According to the present invention, the tip edge of the top die or the bottom die is relatively displaced in the front-rear direction, so that the clamping force of the workpiece by the top die and the bottom die can be suppressed and the wear of the tip edge can be suppressed. Is something that can be done.

It is action explanatory drawing which showed notionally and schematically the principal part of the board | plate bending machine based on embodiment of this invention. It is operation | movement explanatory drawing of being equivalent to the three-point bending of the air bending by the punch and die | dye in a press brake. It is explanatory drawing which shows the structure for adjusting and fixing a bottom die to the front-back direction. It is explanatory drawing which shows the structure for adjusting and fixing a bottom die to the front-back direction. It is action explanatory drawing which showed the principal part of the conventional board | plate material bending machine.

  Hereinafter, the configuration of the plate bending machine according to the embodiment of the present invention will be described with reference to the drawings. Since the overall configuration of the plate bending machine is the same as the conventional configuration, the configuration of the main part Only that will be described.

  Incidentally, the conventional plate bending machine 1 includes a top die 3 and a bottom die 5 for sandwiching (pressing) a plate-like workpiece W from above and below, as shown in FIG. The bending die 7 for bending up and down the protruding portion WP of the workpiece W protruding from the leading edge 5A of the bottom die 5 and the leading edge 5A of the bottom die 5 is provided to be movable up and down. As is well known, the bottom die 5 is provided in a lower frame (not shown) in the plate bending machine 1, and the top die 3 is an upper frame (not shown) that can move up and down with respect to the lower frame. Is provided. The bending die 7 is provided in a bending die holder (not shown) provided on the lower frame so as to be movable up and down.

  In the conventional plate bending machine 1, the leading edge 3A of the top die 3 and the leading edge 5A of the bottom die 5 are provided in the front-rear direction (left-right direction in FIG. 5). Therefore, when the protruding portion WP of the workpiece W is bent upward, for example, by the bending die 7, the tip edge 3A of the top die 3 is bent as a fulcrum. In this case, the distance between the tip edge 5A and the bending die 7 in the bottom die 5 is small, and the workpiece W needs to be firmly clamped by the top die 3 and the bottom die 5.

  Here, since the workpiece W is bent into a V-shape, the tip edge of the top die 3 is in a state where the workpiece W is supported at two points of the tip edge 5A of the bottom die 5 and the bending die 7. If the workpiece W is bent with 3A, this corresponds to three-point bending when air bending is performed in the press brake. That is, the workpiece is supported at two points on both shoulders of the V groove of the die in the press brake, and the workpiece is pressed and bent at one point of the tip of the punch that engages with the V groove (contact with the workpiece by three points). Equivalent to bending).

  Therefore, if the distance between the tip edge 5A of the bottom die 5 corresponding to both shoulders in the V groove of the die and the position where the bending die 7 is in contact with the workpiece W is small, this corresponds to that the V groove is narrow and the workpiece W is In order to bend into a V shape, a large pressing force is required.

  Therefore, in the present embodiment, as shown in FIG. 1A, when the protruding portion WP of the workpiece W is bent upward, the front end edge 3A of the top die 3 is more forward than the front end edge 5A of the bottom die 5 ( When the position is shifted relatively to the left side (bending die 7 side in FIG. 1) and the protruding portion WP is bent downward, as shown in FIG. The position of the front end edge 5A of 5 is relatively shifted to the front side.

  In other words, the leading edge 3A or the leading edge 5A of the top die 3 or the bottom die 5 corresponding to the bending direction of the protruding portion WP of the workpiece W is set to the bottom die 5 or the top die 3 opposite to the bending direction of the protruding portion WP. The protruding portion WP of the workpiece W is bent while being held in a state of protruding to the front side of the leading edge 5A or the leading edge 3A, that is, to the bending die 7 side.

  By the way, the bending state of the workpiece | work W shown to FIG. 2 (B) is the same aspect as the state of FIG. 1 (A). Here, when the bending state shown in FIG. 2 (B) is simulated by the relationship between the punch P and the die D in the press brake, the state shown in FIG. 2 (A) is obtained. That is, the front edge 5A in the bottom die 5 corresponds to one shoulder S1 of the V groove DV in the die D, and the front edge 7A in the bending die 7 corresponds to the other shoulder S2. The leading edge 3A of the top die 3 corresponds to the leading edge PA of the punch P.

  Therefore, the top edge 3A or 5A of the top die 3 or the bottom die 5 corresponding to the bending direction of the protruding portion WP in the workpiece W is set to the front side, and the bottom edge 5A or 3A of the top die 3 opposite to the bending direction is set to the front side. That is, by performing the bending process while maintaining the state protruding to the bending die 7 side, the bending process corresponding to the air bending using the punch P and the die D in the press brake can be performed. Therefore, when the protruding portion WP of the workpiece W is bent, the clamping pressure by the top die 3 and the bottom die 5 can be reduced as compared with the conventional case. And the bending force by the bending die 7 can also be reduced.

  As described above, in order for the top edge 3A or 5A of the top die 3 or the bottom die 5 to relatively protrude forward, it is necessary to provide at least one of the top die 3 or the bottom die 5 so as to be movable back and forth. Therefore, in the present embodiment, the bottom die 5 is configured to be movable back and forth. More specifically, as shown in FIG. 3, the bottom die mounting portion 9 of the lower frame in the plate bending machine 1 is provided with a guide member 11 in the front-rear direction (left-right direction in FIG. 3). The bottom die 5 is guided and supported by the member 11 so as to be movable back and forth.

  In order to position the bottom die 5 in the front-rear direction, a bottom die positioning mechanism 13 is provided. The bottom die positioning mechanism 13 is constituted by a wedge mechanism in the present embodiment. That is, as functionally shown in FIGS. 4A and 4B, the front and rear surfaces of the bottom die 5 (left and right side surfaces in FIGS. 3 and 4) have a left-right direction (perpendicular to the paper surface in FIG. 3). A plurality of wedge members 15F and 15R are provided at appropriate intervals in the direction (vertical direction in FIG. 4). Each of the wedge members 15F and 15R has an inclined surface provided in such a form that one direction in the left-right direction (the upward direction in FIG. 4) widens toward the end.

  A front wedge holder 19 including a plurality of wedge members 17 corresponding to the plurality of wedge members 15F is provided on the front side of the bottom die 5 so as to be movable in the left-right direction (vertical direction in FIG. 4). . A rear wedge holder 23 including a plurality of wedge members 21 corresponding to the plurality of wedge members 15R is provided on the rear side of the bottom die 5 so as to be movable in the left-right direction. The front and rear wedge holders 19 and 23 are moved in the left-right direction by a reciprocating device (not shown) such as a fluid pressure cylinder.

  4A, when the front and rear wedge members 15F and 15R provided on the bottom die 5 are sandwiched between the front and rear wedge members 17 and 21, the bottom die 5 cannot be moved in the front-rear direction. It is in a fixed state. Then, as shown in FIG. 4B, when the pinching by the front wedge member 17 is released, the bottom die 5 can be moved forward (leftward in FIG. 4B) by the rear wedge member 21. . On the contrary, when the pinching by the rear wedge member 21 is released, the bottom die 5 can be moved rearward (right side in FIG. 4A) by the front wedge member 17.

  As already understood, by adjusting the movement position of the front and rear wedge members 17 and 21 in the left and right direction in the bottom die positioning mechanism 13, the movement position of the bottom die 5 in the front and rear direction can be adjusted, and The bottom die 5 can be clamped by the wedge members 17 and 21 to be fixed in a stationary state.

  As can be understood from the above description, one tip edge of the tip edge 3A of the top die 3 or the tip edge 5A of the bottom die 5 is adjusted so as to protrude in the direction of the bending die 7 from the other tip edge. As described above, the same bending as the three-point bending of the air bending by the punch P and the die D in the press brake can be performed. Therefore, as compared with the conventional configuration, the clamping force (clamping pressure) of the workpiece W by the top die 3 and the bottom die 5 can be reduced, and the problems as described above can be solved.

  Note that the present invention is not limited to the above-described embodiment, and can be implemented in other forms by making appropriate modifications. For example, a configuration in which the top die 3 moves back and forth relative to the bottom die 5 or a configuration in which both the top die 3 and the bottom die 5 move back and forth is possible. Further, the configuration of the bottom die positioning mechanism 13 is not limited to the wedge mechanism, and may be a screw mechanism.

DESCRIPTION OF SYMBOLS 1 Sheet | seat bending machine 3 Top die 3A, 5A Tip edge 5 Bottom die 7 Bending type 13 Bottom die positioning mechanism 15F, 15R, 17, 21 Wedge member 19 Front wedge holder 23 Rear wedge holder W Work WP Projection part

Claims (2)

  A plate material provided with a top die and a bottom die for sandwiching a plate-shaped workpiece from above and below, and a bending die for vertically bending a protruding portion of the workpiece protruding from the leading edge of the top die and the bottom die. A bending method of a plate material by a bending machine, wherein when the protruding portion of the workpiece is bent upward, the tip edge of the top die is held in a state of protruding from the tip edge of the bottom die, and the workpiece A plate material bending method characterized in that when the protruding portion of the sheet is bent downward, the bending is performed with the tip edge of the bottom die protruding from the tip edge of the top die.   A top die and a bottom die that sandwich a plate-like workpiece from above and below are provided, and a bending die for bending the protruding portion of the workpiece protruding from the tip edge of the top die and the bottom die up and down is provided. A plate material bending machine, comprising at least one tip edge of the top die or the bottom die so as to be able to protrude relative to the other tip edge.

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