JP3006018U - Upper mold for press brake - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an upper die for a press brake that can be easily attached to and detached from the upper die holder device 1. In order to achieve the above object, an upper mold according to the present invention is an upper mold clamp that is swingably mounted on the holder main body 5 of a press brake by being raised relative to the holder main body 5. An upper mold for a press brake that is pressed and fixed to the holder body 5 by a reaction force of 11, and an inclined surface for swinging the upper mold clamp 11 at a portion corresponding to the upper mold clamp 11 when relatively rising. An upper die for a press brake including 9S, and an engaging groove that is engageable with a locking projection portion provided on an upper die clamp, is provided below an inclined surface of the upper die. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an upper mold that is detachably attached to an upper mold holder device in a press brake, and more specifically, operates the upper mold holder device to increase a clamping force when the upper mold is mounted on the upper mold holder device. Regarding upper mold that can be done.

[0002]

[Prior art]

 As is well known, the press brake has an upper table (sometimes referred to as an upper apron) and a lower table (sometimes referred to as a lower apron) that are vertically opposed to each other. This is a structure in which one of the upper table and the lower table is used as a ram to drive up and down.

In the press brake, an upper die is attached to the lower portion of the upper table and a lower die is attached to the upper portion of the lower table in order to perform bending of a plate-shaped work. .

In the above structure, the movable table is moved up and down to engage the upper die and the lower die, thereby bending the workpiece located between the upper die and the lower die. It is something that is seen.

In the press brake, for example, in order to replace the upper mold according to the bent shape of the work, etc., a large number of upper mold holders are attached to the lower part of the upper table, and the upper mold can be attached and detached by the large upper mold holders. It is a structure to support.

In the conventional upper die holder, the upper die clamp is attached to the holder main body attached to the lower part of the upper table, and the upper die clamp is tightened with the tightening bolts. The upper part of the mold is strongly clamped and fixed.

Therefore, conventionally, in order to attach / detach the upper die to / from the upper table, it is necessary to operate a large number of tightening bolts provided in a large number of upper die holders, and the operation is extremely cumbersome and troublesome. There was a problem.

Therefore, an upper die holder device has been developed in which an air cylinder is attached to the upper die holder, and the upper die clamp is tightened and released by the air cylinder.

[0009]

[Problems to be solved by the device]

 In the upper die holder device having the above-mentioned configuration, a large number of upper die holder devices must be provided with air cylinders, respectively, and an air source is required. Therefore, there is a problem that the configuration becomes complicated and expensive.

Further, in the conventional upper die holder device, when the upper die clamp is released by the upper die clamp provided in the upper die holder device, there is a risk that the upper die may drop.

Further, in the conventional upper die holder device, when the upper die is mounted, the upper die clamp is lightly tightened so that the upper die does not drop, and then the lower die and the upper die are aligned with each other. There is a problem that the upper die clamp must be tightened strongly and the operation is troublesome.

Note that, as a precedent example that is considered to be related to the present invention, there is, for example, EP038712 1A1.

In this prior example, the upper die is clamped between the holder body and the upper die clamp pivotally attached to the upper table of the press brake so that the upper die can be attached and detached as described above. The upper die is rotated continuously so as to avoid the pivot around which the upper die clamp is pivoted, and the upper die is rotated while manually supporting a die weighing 20 kg to 30 kg in front of the machine. It is extremely dangerous to perform the work on the waist and hands of the worker.

Further, when connecting several upper molds in the longitudinal direction, one end of the next upper mold is inserted in the longitudinal direction and connected to the upper mold clamp in which the end of the upper mold is already clamped. There is also the problem that you cannot do it.

The present invention has been made in view of the conventional problems as described above, and an object thereof is to enable easy attachment / detachment / replacement of the upper mold and release the fixation of the upper mold. Another object is to provide a removable upper mold for the upper mold holder device in which the upper mold does not drop.

[0016]

[Means for Solving the Problems]

 In view of the conventional problems as described above, the upper die for a press brake according to the present invention has an upper die provided on the holder body by being raised relatively to the holder body of the press brake. An upper die for a press brake that is pressed and fixed to the holder main body by the reaction force of the clamp is provided, and a portion corresponding to the upper die clamp is provided with an inclined surface for moving the upper die clamp when relatively rising. There is something.

The inclination angle of the inclined surface of the upper mold is about 5 to 20 degrees with respect to the vertical, and more preferably 7 to 11 degrees.

Further, an abutting surface that comes into contact with the lower end surface of the support plate provided in the holder body is provided, and the lower surface of the engaging groove is provided at a higher position and the upper surface is slightly inclined with respect to the abutting surface. .

Further, the support plate provided on the lower part of the holder main body in the upper mold holder device mounted on the lower part of the upper table in the press brake and the upper mold holder main body can swing and the upper mold can be pressed against the support plate. An upper die for a press brake that is detachable between the upper die clamp and the upper die clamp, and a slidable sliding surface is provided between the abutment surface that abuts the lower surface of the support plate and the front or rear surface of the support plate. To increase the clamping force of the upper mold by the upper mold clamp when the upper mold is relatively elevated with respect to the support plate so that the contact surface and the lower surface of the support plate contact the contact surface. The upper die includes an inclined surface for swinging the upper die clamp, and a working portion that works with a lower die provided on the press brake to work the workpiece. When the upper surface of the engaging groove provided on the upper die is supported by the locking projection of the clamp, the distance H between the lower surface of the support plate and the contact surface of the upper die is expressed by the following equation H = (B ² · P) / (A ² · k · tan θ).

However, A is the dimension from the swing center of the upper die clamp to the elastic step for pushing the upper die clamp, and B is the upper die clamp pushes the upper die onto the support plate from the swing center. The average size up to the pressing portion, P is the pressing force for pressing the upper die against the support plate, K is the elastic coefficient of the unitary means, and θ is the inclination angle of the inclined surface.

[0021]

[Action]

 In the above structure, the upper protrusion of the upper mold is located between the support plate and the upper clamp of the upper mold holder device, and the engaging groove formed in the upper mold is provided at the lower portion of the upper mold clamp. And the upper die is moved upward relative to the support plate, the lower surface of the upper die clamp is pressed by the inclined surface provided on the upper die, and the lower portion of the upper die clamp and the support plate are Since the space is expanded, the clamping force due to the reaction force at that time gradually increases, and the upper mold is reliably clamped.

When the clamping force is released, the upper surface of the locking protrusion provided on the lower portion of the upper die clamp and the upper surface of the engaging groove of the upper die engage with each other to prevent the upper die from falling. Is.

Therefore, the upper die can be attached to and detached from the upper die holder device safely and easily without using a tool.

[0024]

【Example】

 In order to facilitate understanding, the overall structure of the upper die holder device 1 which is the subject of the present invention will be described first.

With reference to FIGS. 1 to 3, the upper die holder device 1 according to the present embodiment is detachably attached to a lower portion of an upper table 3 in a press break (not shown).

The upper die holder device 1 presses the upper portion 9U of the upper die 9 against the holder body 5 which is detachably attached to the upper table 3 and the support plate 7 which is integrally provided under the holder body 5. An upper mold clamp 11 that is swingably attached to the holder body 5 for fixing, a clamp force adjusting device 13 that can adjust the clamping force of the upper mold clamp 11, and a clamp for the upper mold 9 by the upper mold clamp 11. A clamp releasing device 15 that can be released is provided, and a contact member 17 provided on the lower part of the upper die clamp 11 so as to be slightly rotatable is slidably contactable with an inclined surface 9S provided on the upper die 9. The contact surface 17S is provided.

More specifically, the holder body 5 does not have a mode in which the thin support plate 7 is integrally provided below the thick upper block portion 5B in the front-rear direction (left and right direction in FIGS. 2 and 3). ing. On the front surface (left side surface in FIG. 2) of the upper block 5B of the holder main body 5, a mounting plate 21 protruding upward through a plurality of bolts 19 (see FIG. 1) is attached.

The mounting plate 21 is brought into contact with the lower front surface of the upper table 3, and the clamp jaws 25 are tightened by the tightening bolts 23 screwed to the upper table 3 to press the mounting plate 21 onto the upper table 3. Thus, the holder body 5 can be attached to the upper table 3.

In order to adjust the vertical position of the holder body 5, a wedge member 27 is interposed between the upper surface of the holder body 5 and the lower surface of the upper table 3, and the wedge member 27 has a front portion. A fixing bolt 31 penetrating through a long hole 29 (see FIG. 1) in the left-right direction provided in the mounting plate 21 is screwed.

In the above-mentioned configuration, the wedge member 27 is held in the left-right direction in FIG. 1 while the clamp jaw 25 is held in a state of being weakly tightened to the extent that the holder body 5 is not dropped and the fixing bolt 31 is loosened. The holder body 5 can be finely adjusted up and down with respect to the upper table 3 by adjusting.

The upper mold clamp 11 is made of a plate-shaped member having a width substantially the same as the width of the holder body 5 in the left-right direction, and is located between the support plate 7 and the upper part 9 U of the upper mold 9. Is rotatably mounted on the holder main body 5 so as to press the support plate 7 to fix it.

More specifically, the upper die clamp 11 has a plurality of through holes 11H provided at substantially the center of the upper die clamp 11 in the vertical direction and is horizontally screwed and fixed to the support plate 7 through the through holes 11H. It is supported by a mounting bolt 33 so as to be swingable in the front-rear direction. In order to facilitate the swinging of the upper die clamp 11, the heads of the mounting bolts 33, the upper die clamp 11, and the contact surface are formed on spherical surfaces 35, respectively. Further, between the upper mold clamp 11 and the support plate 7, an elastic body 37 such as a coil spring or a rubber body which acts to separate them is mounted.

An inclined surface 11S is formed in the lower part of the upper mold clamp 11 so that the upper side approaches the support plate 7 side, and the contact member 17 is provided on the inclined surface 11S. It is mounted so that it can rotate slightly.

More specifically, through holes are provided on both the left and right sides of the lower end of the upper clamp 11, and through the mounting bolts 39 that penetrate the through holes and are screwed to the contact members 17. A clearance is provided between the through hole and the mounting bolt 39, and the contact member 17 is attached to the upper mold clamp 11 so as to be slightly rotatable.

The left and right engaging grooves 9G formed on the upper die 9 and the engagement protrusions 11K that are freely engageable and disengageable are formed on the lower end of the upper die clamp 11 below the contact member 17. There is.

The upper mold clamp 11 applies a clamping force for pressing and clamping the upper mold 9 to the support plate 7 and adjusts the clamping force. It is installed inside a horizontal hole 5H provided in 5B.

More specifically, as shown in FIG. 3, the clamping force adjusting device 13 includes a nut member screwed to the adjusting screw 41 to adjust the position of the ring member 43 movably fitted to the adjusting screw 41. 45 and an elastic member 47 such as a spring mounted between the head 41H of the adjusting screw 41 and the ring member 43.

In the above-described configuration, the accumulating force of the elastic member 47 can be adjusted by adjusting the screwing position of the nut member 45 with respect to the adjusting screw 41 to adjust the compression of the elastic member 47.

The head 41H of the adjusting screw 41 in the clamping force adjusting device 13 is in contact with the back wall portion of the hole 5H, and the ring member 43 has a cylindrical pressing member 49 including a nut member 45. Are in contact.

The tip of the tightening screw 51 of the clamp releasing device 15 provided on the upper die clamp 11 is in contact with the pressing member 49. More specifically, the clamp releasing device 15 is composed of the above-mentioned tightening screw 51 that is screwed through the upper part of the upper die clamp 11, and the lever 53 is integrally formed with this tightening screw 51. It is installed.

Therefore, by operating the lever 53, the tightening screw 51 can be tightened and the tightening screw 51 can be loosened. Left and right stopper pins 55 are attached to the attachment plate 21 in order to limit the operation range (rotation range) of the lever 53.

In the above configuration, when the upper portion 9U of the upper die 9 is positioned between the support plate 7 of the holder body 5 and the upper die clamp 11, the lever 53 of the clamp release device 15 is moved. 1, when the tightening screw 51 is rotated by rotating to the right position R in FIG. 1, the elastic member 47 in the clamping force adjusting device 13 is further compressed, and the urging force of the elastic member 47 increases. The upper mold clamp 11 more firmly tightens and fixes the upper mold 9 by the reaction force of the stored force.

On the contrary, when the lever 53 is rotated to the left position L in FIG. 1 to loosen the tightening screw 51, the upper mold 9 is released from the tightening fixation of the upper mold 9. Become.

As described above, when the upper mold 9 is clamped and fixed by the upper mold clamp 11 by operating the lever 53, the upper mold clamp 11 is moved in the left-right direction in FIG. Rock to.

As described above, the plurality of bolts 57 threaded and fixed to the holder main body 5 through the upper part of the upper mold clamp so that the lower part of the upper mold clamp 11 opens when the upper mold 9 is unfastened and fixed. A spring 59 for opening the clamp is mounted between the upper mold clamp 11 and the upper clamp 11.

Therefore, the upper die clamp 11 can clamp and fix the upper die 9 at a fixed position.

As shown in FIG. 4, the upper mold 9 which is attached to and detached from the upper mold holder device 1 having the above-described structure is provided with a contact surface 9F that contacts the lower end surface 7E of the support plate 7. There is. The portion projecting upward from the contact surface 9F is the upper portion 9U, and the upper portion 9U is provided with a vertical sliding contact surface 9V slidably contacting the front surface 7F or the rear surface of the support plate 7. . The aforementioned engagement groove 9G is formed on the surface opposite to the sliding contact surface 9V, and between the inclined surface 9S and the engagement groove 9G formed above the engagement groove 9G, A slight vertical surface 9SV is formed.

The vertical surface 9SV can be provided to the holding surface when the upper die 9 is clamped by a general upper die clamp, for example.

Further, the upper die 9 is provided with a work processing portion 9M for bending the work W in cooperation with the lower die 63 mounted on the lower table 61 (see FIG. 2) of the press brake at the lower end portion. ing.

As is clear from FIG. 4, the lower surface 9GL of the engagement groove 9G in the upper die 9 is formed at a position higher than the contact surface 9F. The upper surface 9GF of the engaging groove 9G is slightly inclined so that the depth of the groove is lowered corresponding to the upper surface of the locking projection 11 of the upper mold clamp 11.

With the above configuration, the lower end portion of the upper die clamp 11 can be positioned relatively higher than the lower end surface 7 E of the support plate 7 and can be relatively short, so that, for example, when the workpiece W is bent at an acute angle, it interferes with the workpiece W. There is nothing to do.

Further, when the locking protrusion 11K of the upper die clamp 11 and the upper surface 9GF of the engagement groove 9G of the upper die 9 are in contact with each other and the upper die 9 is in a locked state, they are in contact with each other. Since the surface is slightly inclined, the vertical sliding contact surface 9V of the upper mold 9 tends to always contact the support plate 7.

Further, since the engagement groove 9G is provided at a position higher than the contact surface 9F, the dimension from the corner where the contact surface 9F and the sliding contact surface 9V intersect can be increased, and the same height can be achieved. The strength can be increased compared to the case where it is installed in a room.

In the above structure, when the upper mold 9 is removed from the upper mold holder device 1, the following operation is performed to mount the upper mold 9 on the upper mold holder device 1.

First, the lever 53 of the clamp release device 15 is rotated to the position R to hold the tightening screw 51 in the tightened state. As described above, even when the tightening screw 51 is tightened, the space between the support plate 7 and the lower end portion of the upper die clamp 11 is open.

Therefore, the upper portion 9U of the upper die 9 is inserted between the support plate 7 and the upper die clamp 11 in the left-right direction, and the engagement groove 9G formed in the upper die 9 is formed as shown in FIG. It engages with the locking protrusion 11K provided at the lower end of the upper die clamp 11, and brings the inclined surface 9S of the upper die 9 into contact with the contact surface 17S of the contact member 17.

Thereafter, the movable sides of the upper and lower tables 3 and 61 in the press brake are moved up and down to engage the upper die 9 and the lower die 63, so that the upper die 9 rises relative to the holder body 5. To be done.

When the upper die 9 gradually rises relative to the holder body 5 as described above, the inclined surface 9 S of the upper die 9 moves the lower end portion of the upper die clamp 11 to the lower end portion of the upper die 9 via the contact member 17. Press to the left at. Therefore, the upper mold clamp 11 is gradually rotated in the counterclockwise direction in FIG. 2 and gradually compresses the elastic member 47 in the clamp force adjusting device 13.

Therefore, when the upper die 9 relatively rises and the abutment surface 9F abuts on the lower end surface 7E of the support plate 7, the upper die clamp 11 is acted on by the accumulating force of the elastic member 47. The upper mold 9U is firmly clamped.

Therefore, the upper die 9 can be easily attached to the upper die holder device 1.

As described above, after mounting the upper mold 9 on the upper mold holder device 1, in order to remove the upper mold 9 from the upper mold holder device 1, the lever 53 is rotated to the position L on the left side, As described above, loosen the tightening with the tightening screw 51. When the tightening screw 51 is loosened as described above, the upper mold clamp 11 releases the upper mold 9 from being clamped.

When the fastening fixing of the upper die 9 by the upper die clamp 11 is released as described above, the upper die 9 is lowered to its original lowered position (position in FIG. 2) by its own weight. In this case, since the upper surface of the engaging groove 9G of the upper die 9 is hooked on the locking projection 11K, the upper die 9 does not drop and is safe.

In this way, by moving the upper mold 9 in the left-right direction when the upper mold 9 is released from the clamping fixation of the upper mold 9, the upper mold holder device 1 is moved from the upper mold holder 1 to the upper mold 9. It can be removed.

As will be understood, according to the embodiment, the upper die 9 can be easily attached / detached to / from the upper die holder device 1 with a simple structure without using any tool or the like. It is capable of

As already understood, when the lower part of the upper mold clamp 11 is pressed by the inclined surface 9S of the upper mold 9, the clamping force (pressing force) of the upper mold 9 on the support plate 7 by the upper mold clamp 11 is exerted. Since the upper mold 9 and the clamping force adjusting device 13 etc. are a type of clamp in which the clamping force gradually increases as the upper mold 9 rises relative to the support plate 7, It constitutes the force gradual increase mechanism.

As a part of the configuration of the clamp force gradually increasing mechanism, the clamp force adjusting device 13 including the elastic member 47 is provided. Instead of the clamp force adjusting device 13, a compressible fluid (gas) is internally provided. A fluid pressure cylinder (gas spring) can be used. It is also possible to configure the upper die clamp 11 itself with a leaf spring, omit the clamp adjusting device 13, and use the elastic deformation of the upper die clamp 11.

That is, various structures can be adopted as the mechanism for gradually increasing the clamping force of the upper die holder device.

Further, the upper die holder 1 according to the present embodiment has a structure in which the front die 9 can be attached to the rear surface side of the support plate 7 by reversing the front and back of the upper die 9.

That is, in order to mount the upper mold 9 on the rear surface side of the support plate 7, a rear upper mold clamp 65 is mounted on the rear surface of the support plate 7.

More specifically, as shown in FIG. 3, on the rear surface of the support plate 7 of the holder main body 5, a stud 67 having a hemispherical head portion 67H is horizontally mounted by a mounting bolt 69, The upper clamp 65 is swingably supported on the stud 67.

In order to operate the mounting bolt 69, a tool hole 11T is formed in the front upper mold clamp 11, and a head 65H of the stud 67 has a groove 65G formed in the upper mold clamp 65. A detent pin 71 engaged with is attached. Therefore, when the mounting bolt 69 is rotated, the stud 67 does not rotate.

In order to use the clamping force adjusting device 13 for both the upper mold clamp 11 on the front side and the upper mold clamp 65 on the rear side, a small diameter hole 73 is formed in the inner wall of the hole 5H of the holder body 5. There is. An abutting member 75 attached to the upper part of the rear upper clamp 65 penetrates the small diameter hole 73 and abuts on the head 41H of the adjusting screw 41.

A ring nut 77 that restricts the pressing member 49 of the clamping force adjusting device 13 is screwed on the inlet side of the hole 5H.

In the above structure, by tightening the mounting bolts 69, the upper mold 9 on the rear side can firmly press and fix the upper mold 9 to the rear side surface of the support plate 7. On the contrary, by loosening the mounting bolt 69, the clamp of the upper die 9 by the upper die clamp 65 on the rear side is released.

The lever 53 is operated by holding an appropriate inclusion between the front upper mold clamp 11 and the support plate 7 and holding the upper mold clamp 11 in an immovable state. Then, the upper mold 9 may be clamped and fixed by the upper mold clamp 65 on the rear side and fixedly released.

That is, the upper mold 9 can be inverted and selectively mounted before and after the support plate 7 in accordance with the bent shape of the work, and the upper mold 9 for the upper mold holder device 1 can be mounted. It can be easily attached and detached and replaced.

As can be understood from the above description of the embodiment, according to this embodiment, the upper die 9 can be easily attached to and detached from the upper die holder device 1 with a simple structure. Moreover, the upper mold 9 does not drop when the upper mold 9 is released from the upper mold holder device 1, and the safety is further improved.

By the way, as described above, the upper mold 9 is moved upward relative to the support plate 7 in the upper mold holder device 1, and the lower surface of the upper mold clamp 11 is pressed by the inclined surface 9S of the upper mold 9. As the clamp force of the upper die clamp 11 is gradually increased by the operation, a sufficiently large clamping force is obtained when the contact surface 9F of the upper die 9 contacts the lower end surface 7E of the support plate 7. Need to be done.

Therefore, as schematically shown in FIG. 5, when the upper surface of the engaging groove 9 G of the upper mold 9 is in contact with the upper surface of the locking protrusion 11 K of the upper mold clamp 11, The distance between the lower end surface 7E of the upper mold 7 and the contact surface 9F of the upper mold 9 is H; from the center of rotation of the upper mold clamp 11 to the elastic means 47 of the clamping force adjusting device 13 for pressing the upper mold clamp 11. The dimension is A; the average dimension from the center of rotation to the pressing portion where the upper die clamp 11 presses the upper die 9 to the support plate 7 via the contact member 17 is B; the upper die 9 is pressed to the support plate 7. When the pressing force is P; the elastic coefficient of the elastic means 47 is K; and the inclination angle of the inclined surface 9S with respect to the vertical is θ; the dimension H is preferably represented by the following equation.

H = (B ² · P) / (A ² · K · tan θ) Here, as the upper mold 9 rises relatively to the support plate 7, as shown in FIG. The lower part of the clamp 11 is displaced by ΔL and the upper part is displaced by ΔX to compress the elastic member 47, and the clamping force is gradually increased.

Therefore, when the dimension H is relatively smaller than the dimension represented by the above formula, the contact surface 9F of the upper die 9 is moved downwardly by the relative lowering of the upper die 9 and the lower surface 7E of the support plate 7. Since the upper mold 9 may come into contact with the upper mold 9 and a sufficient clamping force cannot be obtained, it is not desirable.

On the other hand, when the dimension H is relatively larger than the dimension represented by the above equation, the elastic member 47 when the contact surface 9F of the upper die 9 contacts the lower end surface 7E of the support plate 7. Although the displacement amount of is larger than the above-mentioned ΔX and a large clamping force can be obtained, when the lever 53 is operated to release the clamp of the upper mold 9, the upper mold may not be fully released. It may be difficult to attach and detach the upper mold 9 to and from the holder 1, which is not desirable.

Therefore, it is desirable that the inclination angle θ of the inclined surface 9S of the upper mold 9 is approximately 5 to 20 degrees. That is, when the tilt angle is 5 degrees or less, the dimension H has to be increased in order to deform the elastic member 47, and when it is 20 degrees or more, the dimension H may be small. However, the component force in the downward direction becomes large, which is not desirable.

By the way, in order to keep the upper mold 9 from falling by its own weight, the frictional force between the inclined surface 9 S of the upper mold 9 and the contact surface 17 S of the contact member 17 is larger than the own weight of the upper mold 9. It is necessary to be. The frictional force (maximum static frictional force) is expressed by static friction coefficient × direct pressure. When the friction angle is θ, the friction coefficient is expressed by tan θ.

By the way, the friction coefficient changes depending on the surface roughness of the inclined surface 9S and the contact surface 17S and the surface condition such as the material and the presence or absence of lubricating oil, but the normal friction coefficient between metals is 0.15. Since it can be seen that the inclination angle θ of the inclination angle 9S is about 7 degrees to 11 degrees.

The present invention is not limited to the above-described embodiments, but can be implemented in other modes by making appropriate changes.

That is, for example, as shown in FIG. 6, in order to improve the wear resistance of the inclined surface 9S and the sliding contact surface 9V of the upper die 9, the inclined surface 9S and the sliding contact surface 9V are made of an alloy or the like. It is also possible to form the high hardness portion 9H by providing a tip, coating or quenching.

7 to 10 are explanatory views showing, as a reference, an upper mold holder to which the upper mold 9 according to this embodiment can be mounted.

In the upper die holder 100 shown in FIG. 7, the clamp holder 101 is rotatably attached to the support plate 7 of the holder body 5 with the bolt 103, and the clamp 105 is movably provided on the lower portion of the clamp holder 101. It is a composition.

The clamp 105 is formed in a hemispherical shape or a semi-cylindrical shape, and is rotatably supported by a slider 107 that is slidably fitted in a hole 101H provided in a lower portion of the clamp holder 101. . An appropriate elastic member 109 such as a disc spring or urethane rubber is elastically mounted as elastic means between the slider 107 and the bottom of the hole 101H.

In this embodiment, by tightening the bolt 103, the distance between the support plate 7 of the holder body 5 and the clamp holder 101 becomes constant, and the distance between the support plate 7 and the clamp 105 becomes constant. Is constant.

After the upper portion 9U of the upper die 9 is inserted and positioned between the support plate 7 and the clamp 105 in the left-right direction (the direction orthogonal to the paper surface), the upper die 9 is moved relative to the holder body 5. As the elastic member 109 is compressed, the upper portion 9U of the upper mold 9 is pressed and fixed to the support plate 7 by the stored force.

The pressing and fixing of the upper mold 9 is released by loosening the bolt 103.

In FIG. 8, a wedge-shaped spring seat 111 is provided at the bottom of the hole 101H shown in FIG. 7, and the spring seat 111 is adjusted by a wedge 115 whose position is adjusted by an adjusting screw 113. The configuration of is the same as that of FIG.

According to this structure, the accumulating force of the elastic member 109 can be adjusted via the spring seat 111 by adjusting the movement of the wedge 115 by the adjusting screw 113.

In FIG. 9, a thin portion 101A is formed in a part of the clamp holder 101, and the thin portion 101A is easily elastically deformed.

According to this configuration, the clamp holder 101 itself is provided with the elastic means.

In the configuration shown in FIG. 10, the bolt 103 movably penetrates the support plate 7, and the elastic force is applied between the support plate 7 and the nut member 117 as a fastening tool screwed to the tip of the bolt 103. This is a configuration in which the member 119 is interposed.

[0099]

[Effect of device]

 As can be understood from the above description of the embodiments, according to the present invention, the upper die clamping force is increased by moving the upper die relative to the support plate in the upper die holder device. The upper die can be easily attached to and detached from the upper die holder device having the configuration.

Further, when the upper die is mounted on the upper die holder device, the clamping force can be obtained without excess or deficiency, so that the upper die can be prevented from falling due to the insufficient clamping force, and the upper die can be attached or detached due to the excessive clamping force. It will not be difficult.

Further, at the time of attaching / detaching and replacing the upper die, the upper die 9 is in a locked state for safety.

[Brief description of drawings]

FIG. 1 is a front view of an upper die holder device.

FIG. 2 is a sectional view taken along line 2-2 in FIG.

FIG. 3 is a sectional view taken along line 3-3 in FIG.

FIG. 4 is an explanatory view showing the shape of an upper die.

FIG. 5 is an explanatory view schematically showing the relationship between the upper die holder device and the upper die.

FIG. 6 is an explanatory diagram showing a modification of the upper mold.

FIG. 7 is an explanatory diagram showing an upper mold holder to which an upper mold according to this embodiment can be mounted.

FIG. 8 is an explanatory diagram showing an upper mold holder to which an upper mold according to this embodiment can be mounted.

FIG. 9 is an explanatory diagram showing an upper mold holder to which the upper mold according to this embodiment can be mounted.

FIG. 10 is an explanatory diagram showing an upper mold holder to which the upper mold according to the present embodiment can be mounted.

[Explanation of symbols]

 1 Upper Die Holder Device 7 Support Plate 9 Upper Die 11 Upper Die Clamp 9G Engaging Groove 9F Abutment Surface 9S Inclined Surface

Claims (10)

[Scope of utility model registration request] 1. An upper die for a press brake, which is pressed and fixed to the holder body by a reaction force of an upper die clamp provided in the holder body when the upper die is relatively raised with respect to the holder body of the press brake. An upper die for a press brake, characterized in that a portion corresponding to the upper die clamp is provided with an inclined surface for moving the upper die clamp when relatively rising. 2. The upper die for a press brake according to claim 1, wherein the inclination angle of the inclined surface provided in the upper die is about 5 to 20 degrees with respect to the vertical. 3. The inclination angle of the inclined surface provided on the upper die is about 7 to 11 degrees with respect to the vertical.
Upper mold for press brake described in. 4. An engaging groove, which is engageable with a locking protrusion provided on the upper die clamp, is provided below the inclined surface provided on the upper die. Upper mold for press brake. 5. The engagement groove according to claim 2, wherein an engaging groove is provided on the lower side of the inclined surface provided on the upper die so as to be engageable with a locking projection portion provided on the upper die clamp. Upper mold for press brake. 6. An abutment surface for abutting a lower end surface of a support plate provided in the holder body is provided, and a lower surface of the engagement groove is provided at a position higher than the abutment surface. Alternatively, the upper die for the press brake according to item 5. 7. The contact surface for contacting a lower end surface of a support plate provided on the holder body is provided, and the lower surface of the engaging groove is provided at a position higher than the contact surface. Upper mold for press brake described in. 8. The upper die for a press brake according to claim 4, wherein the upper surface of the engagement groove is slightly inclined. 9. The upper die for a press brake according to claim 4, wherein the upper surface of the engagement groove is slightly inclined. 10. A support plate provided on a lower portion of a holder main body of an upper die holder device mounted on a lower portion of an upper table of a press brake, and swingable on the upper die holder main body and capable of pressing the upper die to the support plate. An upper die for a press brake that is detachable between an upper die clamp provided and an abutment surface that abuts against the lower surface of the support plate and a front or rear surface of the support plate that can slide. A surface and a lower surface of the support plate to increase the clamping force of the upper mold by the upper mold clamp when the upper mold is relatively raised with respect to the support plate so as to contact the contact surface. The upper die clamp is provided with an inclined surface for swinging the upper die clamp, and a working portion that cooperates with a lower die included in the press brake to machine a workpiece. When the upper surface of the engagement groove provided on the upper die is supported by the stop projection, the distance H between the lower surface of the support plate and the contact surface of the upper die is given by the following equation. The upper die for a press brake according to claim 2, 3, 4, 5, 7, 8 or 9. H = (B ² · P) /
(A ² · k · tan θ) where A is the dimension from the swing center of the upper die clamp to the elastic means for pressing the upper die clamp, and B is the support plate for the upper die from the swing center to the upper die clamp. The average size up to the pressing action portion that presses against, P is the pressing force that presses the upper mold against the support plate, K is the elastic coefficient of the unitary means, and θ is the inclination angle of the inclined surface.