JP2009291821A - Front and rear asymmetrical die of bending machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform front and rear turning-over operation of a front and rear asymmetrical die in a short period of time. <P>SOLUTION: A gooseneck die 18 of press brake 10 is attachable to an upper die supporting member 12, which is extended right and left in the direction of a first axis X and moves vertically, and comprises an attachment part 20, a connection part 22, and a die part 24. The attachment part 20 can be attached to the upper die supporting member 12. The connection part 22 is connected to the attachment part 20 so as to swing between a machining posture and a non-machining posture around the first axis X. The die part 24 is attached to the connection part 22 rotatably around a second axis Y crossing with the first axis X, and has a front and rear asymmetrical shape in which blade tips 24a extends obliquely. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a mold, and more particularly, to a front and back asymmetric mold that can be mounted on a mold support of a bending machine that extends in a first axial direction and moves up and down.

A bending machine such as a press brake is provided with a die support that moves up and down. The mold support part is formed to extend in one direction, and a plurality of molds are attached to the mold support part in one direction. Conventionally known as a mold attached to the mold support part is an asymmetric mold such as a gooseneck mold that is bent into a V-shape and the blade tip extends obliquely in order to avoid interference with the workpiece during bending. (For example, refer to Patent Document 1). In the gooseneck mold, the cutting edge is disposed obliquely, so that the front surface is recessed and the back surface protrudes, and the front and back surfaces are formed asymmetrically. When such a front / back asymmetric mold is used, depending on the bending shape, it is necessary to perform a mold exchanging operation for inverting the front and back of the mold in order to avoid interference with the workpiece.
Japanese Patent No. 4048893

  The mold is generally fixed to the mold support portion by a detachable device or a bolt using hydraulic pressure. However, when the front / back reversing operation is performed in which the mold is removed from the mold support portion and the front / back is reversed, work such as confirmation of the core of the mold and confirmation of the origin position is required. For this reason, the problem that the working time of a bending machine becomes short, so that there are many work frequencies.

  An object of the present invention is to enable the reversing operation of the front and back of a front and back asymmetric mold to be performed in a short time.

  A front and back asymmetric mold of a bending machine according to the present invention is a mold that can be mounted on a mold support portion that extends in the first axial direction and moves up and down, and includes a mounting portion, a coupling portion, and a mold portion. I have. The mounting portion can be mounted on the mold support portion. The connecting portion is connected to the mounting portion so as to be swingable between a processing posture and a non-processing posture around the first axis. The mold part is attached to the connecting part so as to be rotatable about a second axis intersecting the first axis, and has a front and back asymmetric shape in which the cutting edge extends obliquely.

  In this front / back asymmetric mold, when performing the reversing work of the front and back of the mold, with the mounting part mounted on the mold support part, the mold part together with the connecting part is adjacent to the mounting part from the processing posture. Oscillate around the first axis in a non-working posture where interference with the mold does not occur. In this state, the interference with the adjacent mold does not occur, so that the mold part can be rotated 180 degrees around the second axis to reverse the front and back. Finally, when the mold part is returned from the non-working position to the working position together with the connecting part, the front and back of the mold are reversed.

  Here, not only simply rotating the mold part by 180 degrees, but also by rotating the mold part once in a non-working posture and then rotating the mold part by 180 degrees around the second axis, The mold can be rotated 180 degrees while avoiding the interference. For this reason, the front and back inversion work can be performed without removing the front and back asymmetric molds such as the gooseneck mold from the mold support part. Therefore, operations such as confirmation of the core and confirmation of the origin position by attaching and detaching the die are not required, and the inversion operation of the die can be performed in a short time.

  A moving mechanism capable of moving the mold part so as to move toward and away from the connecting part along the second axis direction; and a biasing member for biasing the mold part in a direction approaching the connecting part. Good. In this case, since the mold part can move in the second axial direction, an engaging part that fits unevenly is provided between the mounting part and the mold part in the processing posture, and the mounting part and the mold part Even if they are connected in a centered state during the machining posture, the engaging portion can be easily switched between the engaged state and the disengaged state. Further, since the die portion is urged by the urging member in a direction approaching the connecting portion, the mounting portion and the die portion are automatically engaged in the processing posture.

  You may further provide the engaging part which is provided between a mounting part and a metal mold | die part, and carries out an uneven | corrugated fitting at the time of a processing attitude. In this case, since the mold part and the mounting part are engaged by the concave-convex fitting in the processing posture, the mold part and the mounting part can be connected in a centered state during processing.

  You may further provide the positioning mechanism which positions a connection part in a process attitude | position. In this case, since the connecting portion is positioned on the mounting portion when in the processing posture, the connecting portion is less likely to rattle during processing.

  According to the present invention, not only simply rotating the mold part by 180 degrees, but also rotating the mold part once in a non-working posture and then rotating the mold part by 180 degrees, thereby interfering with adjacent molds. The mold can be rotated 180 degrees while avoiding the above. For this reason, the front and back inversion work can be performed without removing the front and back asymmetric molds such as the gooseneck mold from the mold support part. Therefore, operations such as confirmation of the core and confirmation of the origin position by attaching and detaching the die are not required, and the inversion operation of the die can be performed in a short time.

  1 and 2, a press brake 10 as a bending machine to which an embodiment of the present invention is mounted has a C-shaped frame 11 whose side surface shape opens forward. On the upper frame part 11a and the lower frame part 11b of the frame 11, an upper mold support member (an example of a mold support part) 12 and a lower mold support member 13 are installed facing each other in the vertical direction. At the upper end of the lower mold support member 13, a plurality of types of lower molds 16 having a molding recess and extending in the left-right direction (an example of the first axial direction) are arranged side by side. The upper mold support member 12 is a plate-like member extending in the left-right direction, and is supported so as to be movable in the up-down direction by guide mechanisms 14, 14 disposed on the left and right of the upper frame portion 11a. The upper mold support member 12 is driven up and down by the up-and-down driving unit 15. The upper mold support member 12 includes a hydraulically driven mold attaching / detaching device 12a, and the upper mold support member 12 is provided with a gooseneck mold (an example of a front / back asymmetric mold) 18 according to an embodiment of the present invention. A plurality of upper molds 17 including it are detachably mounted. When the cutting edge portion 17a at the lower end of the upper die 17 enters the concave portion of the lower die 16 when lowered, the workpiece is bent into a V shape.

<Configuration of gooseneck mold>
As shown in FIGS. 3 and 4, the gooseneck mold 18 is mounted on the upper mold support member 12 so as to be detachable and swingably mounted on the first axis X along the left-right direction. A connecting part 22 connected to the part 20, a gooseneck mold part 24 connected to the connecting part 22 so as to be rotatable around a second axis Y orthogonal to the first axis X, and a blade edge 24a extending obliquely; It has. In addition, the gooseneck mold 18 connects the mold part 24 and a moving mechanism 26 that connects the mold part 24 to the connection part 22 so as to be movable toward and away from the connection part 22 along the second axis Y direction. The urging member 28 for urging in the direction approaching the portion 22, the engaging portion 30 for fitting the mounting portion 20 and the mold portion 24 to the concave and convex portions in the processing posture, and the connecting portion 22 are positioned in the processing posture. Positioning mechanism 32.

  The mounting portion 20 has an engagement groove 20 a that engages with the upper mold support member 12 in the upper portion. Moreover, it has the 1st storage space 20b in which the connection part 22 is accommodated in the inside. As shown in an enlarged view in FIG. 5, the first storage space 20b is a space that opens to the back surface (left side surface in FIG. 5) and the bottom surface of the mounting portion 20, and is perpendicular to the horizontally disposed upper wall portion 20c. The vertical wall portion 20d to be arranged is connected on the back side by a quarter-circle arc portion 20e. The arc portion 20e is an arc centered on the first axis X.

  A storage hole 32a for storing the positioning mechanism 32 is formed in the arc portion 20e of the first storage space 20b along the radial direction. A steel ball 32b is mounted in the storage hole 32a so as to freely advance and retract. The steel ball 32b is urged toward the connecting portion 22 by a spring member 32c in the form of a coil spring.

  The connection part 22 is a rectangular plate-like member having a size that can be stored in the first storage space 20b. The connecting portion 22 is swingably supported by the mounting portion 20 by two swing shafts 34 disposed along the first axis X in the mounting portion 20. The upper part 22a of the connecting part 22 is rounded with an arc centered on the first axis X in the cross section so as to engage with the arc part 20e of the first storage space 20b. A spherical concave hole 32 d constituting the positioning mechanism 32 is formed in the upper portion 22 a of the connecting portion 22. The recessed hole 32d is formed at a position where it engages with the steel ball 32b when the connecting portion 22 is in the processing posture. The connecting portion 22 can take a processing posture arranged in contact with the vertical wall portion 20d and a non-processing posture that swings 90 degrees from the processing posture and contacts the upper wall portion 20c.

  A second storage space 22 b for storing the moving mechanism 26 is formed inside the connecting portion 22. The second storage space 22b is generally formed in a columnar shape, and a non-circular detent portion 22c is formed at the bottom on the back side.

  The moving mechanism 26 has a bolt member 40 that engages with the rotation preventing portion 22c to prevent the head 40a from rotating. The head 40a of the bolt member 40 is movable in the second axis Y direction within the rotation stopper 22c. The tip of the bolt member 40 is fixed to the mold part 24 by a nut 44. The bolt member 40 has a tip exposed at a nut housing portion 24b formed on the surface of the mold portion 24 through the mold portion 24 in the second axis Y direction. By tightening the nut 44 into the exposed portion of the bolt member 40, the mold part 24 is connected to the connecting part 22 so as to be movable in the second axis Y direction. In addition, the anti-rotation agent is apply | coated between the nut 44 and the bolt member 40, and the nut 44 becomes difficult to loosen.

  The biasing member 28 is in the form of a coil spring disposed in a compressed state on the outer peripheral side of the bolt member 40. Both ends of the urging member 28 are locked to the head 40a of the bolt member 40 and a washer 43 hooked on a retaining ring 42 attached to the second storage space 22b at a distance from the head 40a. . When the head 40 a of the bolt member 40 is urged by the urging member 28, the mold part 24 is urged in a direction approaching the connecting part 22, that is, the mounting part 20.

  The mold part 24 has a gooseneck structure having a cutting edge 24 a disposed obliquely and bent in a V shape, and is connected to the connecting part 22 via a moving mechanism 26. On the upper surface of the mold part 24, an engagement protrusion 30 a having an isosceles trapezoidal cross section is formed. The engaging part 30 has an engaging protrusion 30a and an engaging concave part 30b formed in a trapezoidal shape so as to engage with the engaging protrusion 30a on the lower surface of the mounting part 20. As shown in FIG. 3, the engagement protrusion 30 a and the engagement recess 30 b are formed on the lower surface of the mounting portion 20 and the upper surface of the mold portion 24 over substantially the entire length in the first axis X direction. Since such an isosceles trapezoidal engaging portion 30 is formed, the mounting portion 20 and the mold portion 24 are automatically centered by the engaging portion 30 in the normal state by the biasing force of the biasing member 28. It is issued.

<Reverse work of gooseneck mold>
When performing the work of turning the gooseneck mold 18 upside down, the mold part 24 is first held by hand and is swung from the machining position shown in FIG. 4 to the non-working position shown in FIG. The non-working posture is a posture for avoiding interference with an adjacent mold. Thereby, it does not interfere with the adjacent mold 17, and the mold part 24 can be rotated around the second axis Y. Next, the mold part 24 is pulled in the second axis Y direction against the urging force of the urging member 28, and the engagement between the mounting part 20 and the mold part 24 by the engaging part 30 is released. In this state, the mold part 24 is rotated 180 degrees to reverse the front and back. This state is shown by a two-dot difference line in FIG. Finally, the mold part 24 reversed 180 degrees is returned from the non-working posture to the machining posture. When returning to the processing posture, the steel ball 32b moves toward the recessed hole 32d, the connecting portion 22 is positioned with respect to the mounting portion 20, and the mold portion 24 is inverted as shown by a two-dot chain line in FIG. become. Then, when the reversal of the desired number of gooseneck molds 18 is completed, the mold reversal operation is completed.

  When a large number of gooseneck molds 18 are turned upside down, every other gooseneck mold may be swung in a non-working position, and the rest may be left in a working position. If every other one is in a non-working position, the gooseneck mold 18 between them will not interfere with the adjacent gooseneck mold 18 and can therefore be turned upside down in the processing position.

  Here, not only simply rotating the mold part 24 by 180 degrees, but also rotating the mold part 24 once in a non-working posture and then rotating the mold part 24 by 180 degrees, interference with the adjacent molds is prevented. Avoiding this, the mold part 24 can be rotated 180 degrees. For this reason, the reverse operation of the gooseneck mold 18 can be performed without removing the gooseneck mold 18 from the upper mold support member 12. Therefore, work such as confirmation of the core and confirmation of the origin position by attaching and detaching the gooseneck mold 18 becomes unnecessary, and the reversing work of the gooseneck mold 18 can be performed in a short time.

  Further, a moving mechanism 26 that can move the mold part 24 so as to be in contact with and away from the connecting part 22 along the second axis Y direction, and an urging force that biases the mold part 24 in a direction approaching the connecting part 22. Further, the mold portion 24 can move in the second axis Y direction. For this reason, the engaging part 30 is provided between the mounting part 20 and the mold part 24 in the processing posture, and the mounting part 20 and the mold part 24 are connected in the centered state in the processing position. The engaging portion 30 can be easily switched between the engaged state and the disengaged state. Further, since the mold part 24 is urged by the urging member 28 in a direction approaching the connecting part 22, the mounting part 20 and the mold part 24 are automatically engaged in the processing posture.

  Further, since the positioning mechanism 32 for positioning the connecting portion 22 in the processing posture is provided, the connecting portion 22 is positioned on the mounting portion 20 when in the processing posture. For this reason, the connecting portion 22 is less likely to rattle during processing.

<Other embodiments>
(A) In the above embodiment, the present invention has been described by taking the gooseneck mold fixed to the upper mold support member 12 by a hydraulic attachment / detachment device as an example. However, as shown in FIG. The present invention can also be applied to the gooseneck mold 118 fixed to the support member 112. In addition, since the other structure of the gooseneck metal mold | die 118 is the same as that of the said embodiment, description is abbreviate | omitted.

  (B) In the above embodiment, the present invention has been described by taking a gooseneck mold as an example of an asymmetric mold. However, the present invention is not limited to this, and all molds having asymmetrical front and back surfaces to be mounted on a bending machine. Applicable.

  (C) In the above-described embodiment, the positioning mechanism 32 performs positioning only in the machining posture. However, the positioning mechanism 32 may perform positioning in the non-machining posture. In this case, a concave hole 32d may be formed on the upper surface 22a of the connecting portion 22 and another concave hole, for example, spaced by 90 degrees. In this case, it becomes unnecessary during the processing, but it can be reused without attaching and detaching the upper mold that is required thereafter.

  (D) In the embodiment, the interval between the non-working posture and the working posture is set to 90 degrees. However, since the non-working posture is a posture for avoiding interference with the adjacent mold, the non-working posture is not limited to 90 degrees, and may be any interval as long as the angle can avoid the interference.

  The present invention is useful in the field of asymmetric molds for bending machines such as press brakes, because the work time for reversing the front and back of an asymmetric mold can be shortened.

The front view of the press brake with which the gooseneck metal mold | die which concerns on one Embodiment of this invention was mounted. The press brake side view. 1 is a partially cutaway front view of a gooseneck mold according to an embodiment of the present invention. The side view of the gooseneck metal mold | die of a process posture. The side expanded partial view of the gooseneck metal mold | die of a process posture. The side view of the gooseneck metal mold | die of a non-working attitude | position. The figure equivalent to FIG. 4 of the gooseneck metal mold | die of other embodiment.

Explanation of symbols

10 Press brake (an example of a bending machine)
12,112 Upper mold support member (example of mold support part)
18,118 Gooseneck mold (an example of front and back asymmetric mold)
DESCRIPTION OF SYMBOLS 20 Mounting part 22 Connection part 24 Mold part 24a Cutting edge 26 Moving mechanism 28 Energizing member 30 Engagement part 32 Positioning mechanism

Claims (4)

A front and back asymmetric mold of a bending machine that can be mounted on a mold support that extends in the first axial direction and moves up and down,
A mounting portion attachable to the mold support portion;
A connecting portion connected to the mounting portion so as to be swingable between a processing posture and a non-processing posture around the first axis;
A mold part having a front and back asymmetric shape, which is mounted on the connecting part so as to be rotatable around a second axis intersecting the first axis, and the blade edge extends obliquely;
Bending machine front and back asymmetric mold with A moving mechanism for connecting the mold part to the connecting part so as to be movable toward and away from the connecting part along the second axial direction;
A biasing member that biases the mold part in a direction approaching the connecting part;
The asymmetric mold for the front and back of a bending machine according to claim 1, further comprising:   The bending machine front and back asymmetric mold | die of Claim 2 further provided with the engaging part which is provided between the said mounting part and the said metal mold | die part, and carries out uneven | corrugated fitting in the said processing attitude | position. The bending machine front and back asymmetric mold | die of any one of Claim 1 to 3 further provided with the positioning mechanism which positions the said connection part in the said process attitude | position.

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